HCPL-5631

The HCPL-5631 is a dual-channel hermetically sealed high-speed logic gate optocoupler manufactured by Broadcom, designed to provide galvanically isolated digital signal transmission in severe environments. Integrally constructed within a ceramic dual in-line package (CDIP), each channel combines a GaAsP light-emitting diode with a high-gain photodetector and a logic output stage. Typical performance includes data rates up to 10 MBd and common-mode transient immunity reaching 10 kV/µs, while operated across the full military temperature range of –55 °C to +125 °C. The hermetic enclosure eliminates moisture ingress and protects internal elements from contamination, ensuring stable long-term performance under thermal and mechanical stress.

Typical applications encompass signal isolation in flight-critical avionics, satellite telemetry interfaces, missile guidance systems, and high-reliability industrial motor drives. These dual-channel optocouplers are regularly used to isolate SPI, I²C, and RS‑422 bus lines or to decouple microprocessor I/O from high-voltage domains. Procurement engineers should note that the HCPL-5631 is a military-grade component routinely supplied with /883 or QML Class H screening; verifying the exact screening standard is essential for program compliance. Because this part supports long-life aerospace and defense platforms subject to extended production timelines, supply continuity planning and engagement through authorized distribution channels are critical to managing the obsolescence risk frequently associated with niche hermetic optocouplers.