Choosing a Backplane Connector: DIN 41612, Hard Metric and High-Speed Differential
Backplane connectors join plug-in cards to the backplane in telecom equipment, industrial control racks and servers. Start by telling three families apart — the long-established DIN 41612, the 2 mm Hard Metric, and backplane series optimised for high-speed differential signals — then narrow down by data rate, density and assembly process.
The Three Families
DIN 41612 (corresponding to IEC 60603-2) is the most widespread Eurocard-style backplane connector: 2.54 mm pitch (5.08 mm also exists), up to three rows and 96 positions, solder or press-fit terminations, common in industrial, rail and medical equipment. The 2 mm Hard Metric (IEC 61076-4-101) has a smaller pitch and higher density and is used in systems such as CompactPCI; vendor documents show standard versions serving data rates up to about 3 Gbps. Beyond that come Hard Metric and backplane series optimised for differential pairs, with vendor-listed rates from roughly 3 Gb/s up to 10 Gbps, some aimed at PICMG 3.x (ATCA). These figures come from vendor datasheets; check the datasheet of the part you choose and the standard text before design use.
| Family | Pitch / standard | Note |
|---|---|---|
| DIN 41612 | 2.54 mm (also 5.08 mm) / IEC 60603-2 | Up to 3 rows, 96 positions |
| Hard Metric | 2 mm / IEC 61076-4-101 | Standard versions up to about 3 Gbps |
| Differential Hard Metric / high-speed backplane | Hard Metric mounting dimensions | Vendor-stated roughly 3 to 10 Gbps |
Start With Data Rate and Pair Count
First fix the data rate per differential pair and the number of pairs you need, then check whether the connector is designed around differential pairs and how shielding and grounds are arranged. Lower-speed systems with mostly single-ended signals and power are usually well served by DIN 41612; once differential rates go up, choose a series optimised for pairs that specifies its impedance, and handle via length and back-drilling on the PCB at the same time.
Press-Fit, Mating Sequence and Board Thickness
Backplane connectors often use press-fit terminations: no soldering, but the PCB hole size, plating and board thickness must match the connector specification, and press tooling is needed. For hot-swap systems, check whether the connector offers contacts of different lengths to control mating sequence (ground first, signals after). Confirm all of this with PCB design and assembly at selection time, not after the first boards arrive.
Fix the data rate and pair count first, pick the family next, and finally confirm the press-fit process, board thickness and mating sequence. Rates and dimensions always follow the datasheet of the part you choose.
FAQ
What is the difference between DIN 41612 and Hard Metric backplane connectors?
DIN 41612 has a 2.54 mm pitch with up to three rows and 96 positions; Hard Metric has a 2 mm pitch and higher density, specified in IEC 61076-4-101, and is common in CompactPCI-type systems.
Should I choose press-fit or soldered backplane connectors?
Press-fit needs no soldering and suits thick, dense backplanes, but hole size, plating and board thickness must match the connector specification and press tooling is required; soldering is more universal and suits small batches or lines without press tooling.
Can you suggest alternatives for a backplane connector?
Yes. Send the original part number, number of positions and rows, and whether it is press-fit, and we will check feasible alternatives.
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