The FX4 series is a high-performance miniature board-to-board connector from HRS. The series features a small form factor, light weight, and flexible stacking height. It is suitable for use in computers, peripheral devices, and business equipment.
The FX4 series is a miniature board‑to‑board connector family with selectable stacking heights from 5 mm to 11 mm in 1 mm steps. Both through‑hole and SMT versions are offered, featuring low insertion/extraction force, mis‑insertion prevention, and flux‑swell protection. The series reduces mounting space and weight compared with the previous FX2 series, with up to 80 % smaller mounting area for the SMT type.
The handbook lists detailed product specifications, material data, ordering codes, and mechanical drawings for each variant (e.g., FX4C‑20P‑1.27DSA). It also includes connector precautions such as tolerance clearance, prefixed pin handling, and recommended solder‑reflow profiles.
| Current rating | 0.5 A |
|---|---|
| Operating Temperature Range | -55 °C to +85 °C |
| Storage Temperature Range | -10 °C to +60 °C |
| Contact resistance | 55 mΩ max |
| Insulation resistance | 100 MΩ min |
| Withstanding voltage | 300 V AC for 1 min |
| Vibration test | 10 – 55 Hz, 0.75 mm amplitude, 2 h each direction |
| Insulator material | Polyamide (UL94V‑0) |
| Contact finish | Selective gold plated |
| Contact pitch | 1.27 mm |
| Number of contacts (options) | 20, 32, 40, 52, 60, 68, 80 |
The connector is rated for a maximum current of 0.5 A.
It operates from –55 °C to +85 °C and can be stored from –10 °C to +60 °C.
The series offers variants with 20, 32, 40, 52, 60, 68, or 80 contacts.
All FX4 connectors use a 1.27 mm contact pitch.