In the case of a subrack, for example, there are three mounting options: a Rear of the backplane b Module side of the backplane c Front of the module Fixed connectors: For application on
Recommended method of mounting
Maximum number of contacts
Table 1 – Maximum number of contacts – fixed connector
Table 2 – Maximum number of contacts – free cable connector
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Free cable connector on rear side
Fixed board connector according to IEC 61076-4-100
Free cable connector on module side
Fixed board connector, rectangular connection
Free cable connector on front side of PCB
2 Module side of the backplane
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Ratings and characteristics
Proof voltage: contact/ground > 750 V r.m.s (according to table 15)
Current rating: 2,1 A (grid 2,5 mm × 2,5 mm)
(at 70 °C) 2,2 A (grid 2,5 mm × 5 mm “chess”)
2,7 A (grid 5 mm × 5 mm) Insulation resistance: 10 4 MΩ
Printed board thickness: Backplane 1,6 mm to 4,5 mm
Plug-in unit 1,6 mm to 3,2 mm Metal-plated hole: 0,94 mm – 1,09 mm
Shielding effectiveness: 4 contacts/25 mm Style: A (1 SU) : 10 dB (at 300 MHz)
(arrangement 4, table 7) B (2 SU) : 14 dB (at 300 MHz)
Normative references
This section of IEC 61076 references several normative documents that are integral to its provisions For dated references, any amendments or revisions to these publications are not applicable However, it is advisable for parties involved in agreements based on this part of IEC 61076 to consider using the latest editions of the referenced normative documents In the case of undated references, the most recent edition of the cited document is applicable Additionally, IEC and ISO members keep updated registers of valid International Standards.
IEC 60068-1:1988, Environmental testing – Part 1: General and guidance
IEC 60068-2-21:1999, Environmental testing – Part 2-21: Tests – Test U: Robustness of terminations and integral mounting devices
IEC 60326-3:1991, Printed boards – Part 3: Design and use of printed boards
IEC 60352-1:1997, Solderless connections – Part 1: Wrapped connections – General require- ments, test methods and practical guidance
IEC 60352-2:1990: Solderless connections – Part 2: Solderless crimped connections – General requirements, test methods and practical guidance
IEC 60352-3:1993, Solderless connections – Part 3: Solderless accessible insulation displace- ment connections – General requirements, test methods and practical guidance
IEC 60352-5:1995, Solderless connections – Part 5: Solderless press-in connections – General requirements, test methods and practical guidance
IEC 60410:1973, Sampling plans and procedures for inspection by attributes
IEC 60512 (all parts), Connectors for electronic equipment – Tests and measurements
IEC 60512-1-100:2001, Connectors for electronic equipment – Tests and measurements –
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IEC 60917-1:1998, Modular order for the development of mechanical structures for electronic equipment practices – Part 1: Generic standard
IEC 60917-2-2:1994 outlines the modular order for developing mechanical structures for electronic equipment This standard specifies the interface coordination dimensions relevant to the 25 mm equipment practice It includes detailed specifications for dimensions concerning subracks, chassis, backplanes, front panels, and plug-in units, ensuring compatibility and standardization in electronic equipment design.
IEC 61076-1:1995, Connectors with assessed quality for use in d.c., low-frequency analogue and digital high-speed data applications – Part 1: Generic specification
IEC 61076-4:1995, Connectors with assessed quality for use in d.c., low-frequency analogue and digital high-speed data applications – Part 4: Sectional specification – Printed board connectors
IEC 61076-4-001:1996, Connectors with assessed quality for use in d.c., low-frequency analogue and digital high-speed data applications – Part 4: Printed board connectors –
IEC 61076-4-100:2001, Connectors for electronic equipment – Part 4-100: Printed board connectors with assessed quality – Detail specification for two-part connector modules having a grid of 2,5 mm for printed boards and backplanes
ISO 1302:1992, Technical drawings – Method of indicating surface texture
Marking
The marking of the connector and the package shall be in accordance with 2.6 of IEC 61076-4.
The Style 4 SU male connector features male contacts arranged in a "chess" pattern, designed for press-in termination with a rear plug-up cable connection It includes ground contacts, and both the signal and ground contacts are gold-plated, ensuring compliance with performance level 1 and assessment level G.
The Style 1 SU features female contacts arranged in a 2.5 mm × 2.5 mm grid pattern, excluding ground contacts The signal contacts are made of a palladium alloy, and the cable is constructed with solid conductors and crimp termination, compatible with AWG sizes 30 to 24 This design meets performance level 2 and assessment level G standards.
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The designation of plug-in connectors shall be defined as follows in accordance with this standard:
L stands for letter, N stands for number.
1 SU: Signal contacts with ground contacts
2 SU: Signal contacts with ground contacts
4 SU: Signal contacts with ground contacts
9 SU: Signal contacts with ground contacts
10 SU: Signal contacts with ground contacts
No contacts Signal contacts without ground contacts 2,5 x 2,5
Signal contacts with ground contacts 2,5 x 2,5
Type and variant of termination (see also table 6) P1
Contact finish of signal/ground contacts
Without finish Gold, gold alloy Palladium, palladium alloy
For ordering connectors according to this detail specification, the IEC type designation described in 1.5 shall be used.
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2.1.1.1 system unit (SU) modular pitch of 25 mm, which is the basis for the design of all mechanical features
2.1.1.2 mounting code special marks on the connector housings simplify correct installation of male connectors (fixed connectors) or male connector bodies and contact equipment in the case of cable connectors
2.1.2.1 engaging range the minimum to maximum distance between the reference planes of the fixed and free connectors, within which reliable contact making is guaranteed
The equipment grid allows for flexible selection within a basic grid size of 2.5 mm × 2.5 mm, enabling the arrangement of male and female contacts based on specific applications Each system unit (SU) can accommodate up to 41 signal contacts and a maximum of four ground contacts.
The full grid standard equipment features a contact arrangement where every grid position is fully equipped In contrast, the chess pattern grid employs an alternating contact arrangement, resembling the squares of a chessboard.
The rear plug-up contact termination post is typically pressed into the backplane and features a contact area at the back, allowing for the connection of a free connector, such as a cable connector.
2.1.2.5 press-in shoulders areas of the male contact, by means of which the contact can be pressed into the backplane
2.1.3.1 contact range range of all contacts which engage/separate simultaneously, within the limits of the required reliable engaging range
2.1.3.2 engaging cycles an engaging cycle comprises the engaging/separating process for a connector
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2.1.3.3 first possible contact point depth dimension of the first point on the female contact, which can possibly be touched by the incoming male contact
2.1.3.4 contact point depth dimension of the point on the female contact, from where the specified contact resistance with the incoming male contact is met
Coding device accessories enable non-reversible pairing of connectors, ensuring that only connector pairs with matching coding devices can connect This system effectively prevents the mating of pairs with differing coding.
180° polarization housing parts of the fixed and free connector have a 180° polarization to prevent incorrect insertion
2.1.4.3 locking protrusions on the side of the housing of the free cable connector used for latching in the male connector body of the fixed board connector
2.2 Surveys of styles and variants
2.2.1.1 Survey of connector style designations
(1 SU) (2 SU) (4 SU) (9 SU) (10 SU)
Male connector, right-angled connection
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Male connector body (with flange) B D G H
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Male connector for front installation J K L
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Basic type of termination Variant Lengths (see also 3.4.2)
P Press-in connection for plated through-hole
∅ 1 mm, straight, according to IEC 60352-5
R Press-in connection for plated through-hole
∅ 1 mm, straight, with rear plug-up connection according to IEC 60352-5
U Press-in connection for plated through-hole
∅ 1 mm, straight, with rear plug-up and wrap connection according to IEC 60352-5
L 90° angled press-in connection for plated- through hole ∅ 1 mm, according to IEC 60352-5
S 90° angled solder connection according to
Basic type of termination Variant Wire gauges
IEC 60352-2 C1 1 × stranded wire: 0,14 mm² to 0,35 mm²
C2 1 × stranded wire: 0,05 mm² to 0,14 mm²
C3 1 × solid wire: ∅ 0,25 mm to 0,50 mm
I Insulation displacement connection according to IEC 60352-3 I1 Stranded wire: 0,09 mm² to 0,14 mm²
Solid wire: ∅ 0,25 mm to 0,40 mm (AWG 30 to AWG 26)
I2 Stranded wire: 0,22 mm² to 0,35 mm²
Solid wire: ∅ 0,40 mm to 0,63 mm (AWG 26 to AWG 22)
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Male connectors or male connector bodies connected to the rear contact areas of male contacts shall be arranged in any position – horizontally or vertically – in the backplane of a subrack.
The male connector bodies are divided into specific SU areas that allow for the side-by-side connection of various cable connector types When plugged in, these cable connectors securely engage with the male connector bodies.
The mounting methods outlined in section 1.1 and illustrated in figure 1 enable connectors to be used in opposing mating directions The contact designation, including rows and positions, must be indicated in the viewing and mating direction on the module side of the backplane, specifically assigned to individual components with male contacts in the backplane When a cable connector is inserted at the back of the backplane, the contact row designation of the male connector is theoretically reversed This reversal must be considered in the electrical assignment between the fixed board connector and the free cable connector at the back of the backplane, as shown in figure 2.
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Figure 2 – Method of numbering contacts
Male connector bodies are generally pushed onto a suitable connection area of the male contacts which are pressed into the backplane, for example a male connector according to
IEC 61076-4-100 specifies that connectors can be securely attached to the subrack, backplane, or directly to the pressed-in male contacts, ensuring compliance with the test schedule requirements The male connector bodies must feature visual indicators, such as distinct outer contours on the lateral walls, to facilitate correct installation within the male contact field When directly fixed to the male contacts in a full grid contact arrangement, adherence to the specified male contact geometry is essential.
Free cable connector on rear side of backplane
Fixed connector body or fixed connector on rear side of backplane
Fixed connector (male) on backplane (IEC 61076-4-100)
Fixed connector (female) (IEC 61076-4-100) PCB
Free cable connector on module side of backplane
Fixed cable connector on module side of backplane
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Male connectors can be installed mainly in a vertical orientation, but they are also suitable for horizontal mounting, such as in a complete grid of 2.5 mm The minimum mounting pitch for these connectors is 15 mm.
Mounting of a male connector body at the rear of a backplane:
The male contacts located on the lateral walls of the male connector body ensure the proper depth stop for establishing the correct contact engagement range.
Mounting of a male connector body on the module side of a backplane:
The male connector body is flush-mounted Premating male contacts shall be used to ensure the correct contact engaging range.
Connector styles without a flange can be installed side by side flush – without loss of pitch.
Overlapping connection of modules and subracks is possible, for example at the rear of a backplane.
Ensuring reliable contact between fixed and free connectors is achieved through the defined contact level in the engagement areas of different male contact lengths, such as utilizing a depth stop within the male connector body.
Different contact levels should be staggered by at least 1,75 mm in order to ensure an electrically reliable engaging sequence.
Cable connectors typically come as individual components, including female connector bodies, female contacts, housing (either single or multi-section), and a cable clamp, along with an insertion and extraction tool To assemble a plug-in cable, these parts must be combined to create a complete cable connector, following the manufacturer's instructions and using appropriate tools It is essential to ensure that the finished cable connector meets the specified requirements.
The sides of the receptacle shall have polarized contours, which prevent a wrong engagement in the male connector body.
The first possible contact point between the female and male contacts during the connection process shall comply with the requirements of 3.5.2.
Four shielding or ground contacts are positioned along the sides or corners of the female connector body, ensuring a connection between the fully shielded female connector housing and the male contacts of a fixed board connector.
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All slots of a printed board connector can be coded, with each SU partition of a male connector body offering nine possible coding positions A plastic coding device is inserted into grooves on the female connector body to facilitate this coding.
Definitions
Mechanical features
2.1.1.1 system unit (SU) modular pitch of 25 mm, which is the basis for the design of all mechanical features
2.1.1.2 mounting code special marks on the connector housings simplify correct installation of male connectors (fixed connectors) or male connector bodies and contact equipment in the case of cable connectors
Contacts and terminations
2.1.2.1 engaging range the minimum to maximum distance between the reference planes of the fixed and free connectors, within which reliable contact making is guaranteed
2.1.2.2 equipment grid the equipment grid can be freely selected within the basic grid of 2,5 mm × 2,5 mm The male/female contacts can be arranged according to the application A system unit (SU) can be equipped with a maximum of 41 signal contacts and a maximum of four ground contacts.
2.1.2.3 standard equipment full grid: contact arrangement in which all grid positions are equipped. chess pattern grid: contact arrangement in which the grid positions are equipped alternately like the squares on a chess board.
2.1.2.4 rear plug-up contact termination post, usually being pressed-in into the backplane and provided at the rear of the backplane with a contact area, to which a free connector (cable connector) can be connected
2.1.2.5 press-in shoulders areas of the male contact, by means of which the contact can be pressed into the backplane
Engagement sequence
2.1.3.1 contact range range of all contacts which engage/separate simultaneously, within the limits of the required reliable engaging range
2.1.3.2 engaging cycles an engaging cycle comprises the engaging/separating process for a connector
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2.1.3.3 first possible contact point depth dimension of the first point on the female contact, which can possibly be touched by the incoming male contact
2.1.3.4 contact point depth dimension of the point on the female contact, from where the specified contact resistance with the incoming male contact is met
Mechanical coding, locking
2.1.4.1 coding devices accessories allowing pairs of connectors to be assigned to each other non-reversible, i.e only connector pairs equipped with matching coding devices can mate Mating of pairs with different coding is reliably prevented.
180° polarization housing parts of the fixed and free connector have a 180° polarization to prevent incorrect insertion
2.1.4.3 locking protrusions on the side of the housing of the free cable connector used for latching in the male connector body of the fixed board connector
Surveys of styles and variants
Styles of connectors
2.2.1.1 Survey of connector style designations
(1 SU) (2 SU) (4 SU) (9 SU) (10 SU)
Male connector, right-angled connection
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Male connector body (with flange) B D G H
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Male connector for front installation J K L
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Survey of termination variants
Basic type of termination Variant Lengths (see also 3.4.2)
P Press-in connection for plated through-hole
∅ 1 mm, straight, according to IEC 60352-5
R Press-in connection for plated through-hole
∅ 1 mm, straight, with rear plug-up connection according to IEC 60352-5
U Press-in connection for plated through-hole
∅ 1 mm, straight, with rear plug-up and wrap connection according to IEC 60352-5
L 90° angled press-in connection for plated- through hole ∅ 1 mm, according to IEC 60352-5
S 90° angled solder connection according to
Basic type of termination Variant Wire gauges
IEC 60352-2 C1 1 × stranded wire: 0,14 mm² to 0,35 mm²
C2 1 × stranded wire: 0,05 mm² to 0,14 mm²
C3 1 × solid wire: ∅ 0,25 mm to 0,50 mm
I Insulation displacement connection according to IEC 60352-3 I1 Stranded wire: 0,09 mm² to 0,14 mm²
Solid wire: ∅ 0,25 mm to 0,40 mm (AWG 30 to AWG 26)
I2 Stranded wire: 0,22 mm² to 0,35 mm²
Solid wire: ∅ 0,40 mm to 0,63 mm (AWG 26 to AWG 22)
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Information on application
Connector pairs
Male connectors or male connector bodies connected to the rear contact areas of male contacts shall be arranged in any position – horizontally or vertically – in the backplane of a subrack.
The male connector bodies are divided into specific SU areas that allow various cable connector types to be plugged in side by side When connected, the cable connectors securely engage with the male connector bodies.
The mounting methods outlined in section 1.1 and illustrated in figure 1 enable connectors to be used in opposing mating directions The contact designation, including rows and positions, must be indicated on the module side of the backplane in the viewing and mating direction, specifically for male contacts in the backplane When a cable connector is inserted at the back of the backplane, the contact row designation of the male connector is theoretically reversed This reversal must be considered in the electrical assignment between the fixed board connector and the free cable connector at the back of the backplane, as shown in figure 2.
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Figure 2 – Method of numbering contacts
Fixed board connectors
Male connector bodies are generally pushed onto a suitable connection area of the male contacts which are pressed into the backplane, for example a male connector according to
IEC 61076-4-100 specifies that connectors can be securely attached to the subrack, backplane, or directly to the pressed-in male contacts, ensuring compliance with the test schedule requirements The male connector bodies must feature visual indicators, such as distinct outer contours on the lateral walls, to facilitate correct installation within the male contact field When directly fixed to the male contacts in a full grid contact arrangement, adherence to the specified male contact geometry is essential.
Free cable connector on rear side of backplane
Fixed connector body or fixed connector on rear side of backplane
Fixed connector (male) on backplane (IEC 61076-4-100)
Fixed connector (female) (IEC 61076-4-100) PCB
Free cable connector on module side of backplane
Fixed cable connector on module side of backplane
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Male connectors can be installed in both vertical and horizontal orientations, such as in a complete grid of 2.5 mm, with a minimum mounting pitch of 15 mm.
Mounting of a male connector body at the rear of a backplane:
The male contacts located on the lateral walls of the male connector body ensure the proper depth stop for establishing the correct contact engagement range.
Mounting of a male connector body on the module side of a backplane:
The male connector body is flush-mounted Premating male contacts shall be used to ensure the correct contact engaging range.
Connector styles without a flange can be installed side by side flush – without loss of pitch.
Overlapping connection of modules and subracks is possible, for example at the rear of a backplane.
Reliable contact between fixed and free connectors is ensured by the contact level defined in the engagement areas of different male contact lengths, such as a depth stop in the male connector body.
Different contact levels should be staggered by at least 1,75 mm in order to ensure an electrically reliable engaging sequence.
Free cable connectors
Cable connectors typically come as individual components, including female connector bodies, contacts, housing (either single or multi-section), and a cable clamp, along with an insertion and extraction tool To assemble a plug-in cable, these components must be combined according to the manufacturer's instructions using appropriate tools It is essential to ensure that the finished cable connector meets the specified requirements.
The sides of the receptacle shall have polarized contours, which prevent a wrong engagement in the male connector body.
The first possible contact point between the female and male contacts during the connection process shall comply with the requirements of 3.5.2.
Accessories
The female connector body must feature four shielding or ground contacts positioned along its sides or corners These contacts establish a connection between the fully shielded housing of the female connector and the male contacts of a fixed board connector.
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All slots in a printed board connector can be coded, with each SU partition of a male connector body offering nine potential coding positions A plastic coding device is used, which fits into grooves on the female connector body.
To ensure proper functionality, at least two coding grooves on the female connector body must be sealed with coding devices, while the corresponding coding keys on the male connector body should be removed Ideally, the coding devices should be positioned on the two outer sides of the cable connector.
Coded slots on a printed board connector shall reliably prevent a cable connector being inserted and any electrical connection being made.
Optical identification for mounting position: right: vertical above: horizontal mounting
Figure 3 – Designation of the coding keys
Removal of the coding keys from printed board connectors shall be performed with a simple tool.
Shielding and grounding
For effective shielding and grounding, the ground potential must be directed from the cable's shielding through the conductive shield housing of the connector This is achieved via four female contacts located at the corners of the female connector body, which connect to four male contacts in the backplane, ensuring an electrical connection to the shielding and grounding layer.
The shield/ground contacts are at grid positions A1, A9, E1, E9 of a SU partition (see also arrangement 4, table 7).
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Basic styles of the connections
The cable connector system is specified for use primarily in conjunction with the male contact types described in IEC 61076-4-100.