ACPL-6651L

Overview

The ACPL-6651L is a high-speed, hermetic optocoupler manufactured by Broadcom Limited. It features four independent channels within a single package, designed for robust signal isolation in demanding environments. The device supports a data rate of 10 Mb/s and provides an insulation voltage of 1500 Vrms. Key electrical parameters include a typical rise time of 20 ns and a fall time of 8 ns. The output type is specified as a Photo IC with a current transfer ratio of 100%. It operates with a forward current of 20 mA and a forward voltage of 1.55 V. The component is housed in a flat-pack 16-pin configuration suitable for through-hole mounting.

Feature Summary

• Hermetically sealed construction ensures reliability in harsh operating conditions
• Four-channel architecture enables simultaneous multi-signal isolation
• High-speed performance supports data rates up to 10 Mb/s
• Photo IC output type provides stable logic-level signaling

Applications

• Industrial automation control systems requiring galvanic isolation
• Power supply feedback loops for noise immunity
• Signal transmission across isolated ground planes
• Microprocessor interface circuits in high-noise environments

Procurement Notes

Verify the specific ordering suffix and revision level against the latest official datasheet before procurement. Ensure that the hermetic flat-pack package dimensions align with the target PCB footprint. Confirm that the 1500 Vrms isolation rating meets the safety requirements of the end application. Cross-reference the manufacturer part number with authorized distributor catalogs to avoid counterfeit components. Check for any recent product change notices affecting pinout or electrical characteristics.

Selection Notes

Select this component when high-speed digital isolation is required alongside environmental durability. The four-channel design reduces board space compared to discrete single-channel solutions. Consider the 10 Mb/s data rate limit when designing communication interfaces. The hermetic seal makes it suitable for applications where standard plastic packages may fail due to moisture or chemical exposure. Evaluate the 1500 Vrms isolation barrier against system voltage spikes.

Part Context

The ACPL-6651L belongs to the ACPL-665xL series of high-speed optocouplers from Broadcom. This series includes variants such as the ACPL-6650L and ACPL-665KL, which share similar hermetic packaging and high-speed capabilities. These devices are engineered for industrial and military-grade applications where long-term reliability and signal integrity are critical. The family is characterized by its use of Photo IC technology for consistent performance across temperature variations.

Replacement Considerations

Direct substitutes within the same hermetic series include the ACPL-6650L and ACPL-665KL. Verify channel count and electrical specifications before substitution. Ensure compatibility with existing PCB layouts due to the shared flat-pack 16-pin form factor.