4-Position Push-Pull Jack for Signal-Level Cable Assemblies
The Hirose HR10A-7J-4S(73) is a 4-position circular jack with female sockets, part of the HR10A series. The silver-plated phosphor bronze contacts terminate via solder cup, and the integrated backshell, clamp, and strain relief simplify cable assembly while protecting the solder joints from pull-out forces. Typical applications include sensor interfaces, test equipment, and instrumentation cabling where a compact, push-pull circular connector is needed.
What the 2 A Rating and Silver Plating Mean for the Circuit
The 2 A per-contact rating limits this connector to signal-level loads and low-current control circuits. The silver mating finish is 78.7 µin thick.
4 Positions vs 6 Positions — Which HR10A Jack Fits Your BOM?
The HR10A-7J-4S(73) carries 4 positions, while the sibling HR10A-7J-6S(73) carries 6 positions — both in the same shell size 7, same push-pull coupling, same 2 A rating. The 4-position variant is the right choice when the circuit count matches exactly; the 6-position version adds two extra contacts for additional signal lines or a spare pair. Both use silver-plated contacts and solder cup termination, so the cable assembly process is identical. The voltage rating differs: the 4-position is rated 150 VAC / 200 VDC, while the 6-position is rated 100 VAC / 140 VDC — the extra contacts reduce the creepage distance between adjacent circuits.