HCPL-7851#100

Instrumentation, Op Amps, Buffer Amps Overview

The HCPL-7851#100 is a Class H hermetically sealed optically isolated amplifier manufactured by Broadcom Limited. It integrates a Sigma-Delta modulator and DAC for high-reliability signal isolation. Key electrical parameters include a 100 kHz bandwidth, 1500 Vrms isolation voltage, and 8 V/V gain. The device operates on a single 5V supply (4.5V to 5.5V) with a ±200mV input dynamic range. It features 69 dB CMRR, 600 µV input offset voltage, and 570 nA input bias current. The component supports -55°C to +125°C operation in an 8-pin ceramic DIP package.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• High reliability Class H hermetic sealing for harsh environments
• Sigma-Delta modulation technology for high common-mode transient immunity
• Integrated analog-to-digital and digital-to-analog conversion
• Military-grade temperature range support

Instrumentation, Op Amps, Buffer Amps Applications

• Motor controller current sensing
• Variable frequency drive isolation
• Industrial automation signal conditioning
• Medical equipment isolation

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix #100 against official datasheets to confirm pinout and packaging details, as suffixes may indicate tape-and-reel or specific variant configurations. Ensure compatibility with MIL-PRF-38534 Class H requirements if mission-critical reliability is mandated. Cross-reference manufacturer documentation for any recent product change notices affecting this specific part number.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when high common-mode transient immunity and hermetic sealing are required for analog signal isolation. The 100 kHz bandwidth suits moderate-speed applications like motor control. Verify that the 8 V/V fixed gain meets system requirements, as external adjustment is not supported. Ensure the 5V single-supply constraint aligns with the target power architecture.

Instrumentation, Op Amps, Buffer Amps Part Context

The HCPL-7851 belongs to Broadcom's HCPL series of optically isolated amplifiers. It utilizes proprietary internal shielding to achieve high common-mode rejection. The device replaces traditional discrete isolation solutions by integrating modulation and demodulation circuits into a single hermetic package, ensuring long-term stability in demanding industrial and military applications.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

No verified public substitute part numbers are available in the provided source material.