HCPL-7850

Instrumentation, Op Amps, Buffer Amps Overview

The HCPL-7850 is a hermetically sealed analog isolation amplifier manufactured by Broadcom Limited. It provides accurate, electrically isolated, and amplified representations of voltage and current signals. The device integrates a sigma-delta analog-to-digital converter optically coupled to a digital-to-analog converter within an 8-pin ceramic DIP package. Key electrical specifications include a bandwidth of 100 kHz, a gain tolerance of ±5%, and a common mode rejection capability of 8 kV/µs at VCM = 1000 V. It operates on a single supply voltage ranging from 4.5 V to 5.5 V and supports a full military temperature range from -55°C to +125°C.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Hermetically sealed construction in an 8-pin ceramic DIP package for high reliability
• Sigma-delta modulation architecture with optical coupling for signal isolation
• High common mode rejection ratio suitable for noisy environments
• Qualified for full military temperature range operation

Instrumentation, Op Amps, Buffer Amps Applications

• Motor phase and rail current sensing in high-speed motor drives
• Inverter current sensing in industrial and military systems
• Switched mode power supply signal isolation
• General purpose analog signal isolation in life-critical systems

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix code (e.g., #300) against the manufacturer's datasheet to confirm pin configuration and package variant. Ensure the procurement source provides documentation confirming MIL-PRF-38534 Class H qualification if required for the application. Check for DSCC drawing number markings on the component body to validate authenticity and traceability. Confirm RoHS status as this series may have non-compliant variants.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select the HCPL-7850 when high reliability and hermetic sealing are mandatory for harsh industrial or military environments. This component is appropriate for applications requiring superior noise immunity compared to traditional current transformers or Hall-effect sensors. Consider the 100 kHz bandwidth and 8 V/V gain when designing feedback loops for motor controllers. Verify that the system can accommodate the 4.5 V to 5.5 V supply requirement and the thermal characteristics of the ceramic DIP package.

Instrumentation, Op Amps, Buffer Amps Part Context

The HCPL-7850 belongs to the HCPL-78xx family of optically isolated amplifiers produced by Broadcom (formerly Avago/Agilent). These devices utilize sigma-delta technology to achieve high linearity and isolation performance. The family is designed for applications demanding robust signal integrity in electrically noisy environments, such as power electronics and aerospace systems. The HCPL-7850 specifically offers a fixed gain configuration optimized for precision measurement tasks.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

The HCPL-7840 is noted for functional compatibility within the same product family. Verify pinout and gain specifications before substitution. No other direct cross-references are confirmed in public documentation.