HCPL0661 Equivalent & Substitute Parts

Part Overview

The HCPL0661 is a logic output optoisolator manufactured by onsemi, featuring 3750Vrms isolation voltage, 2 channels with open collector Schottky clamped outputs, and 10Mbps data rate capability. The device is rated for -40°C to 85°C operating temperature and is housed in an 8-SOIC surface mount package. This part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations.

Substiute Parts

HCPL0661

onsemiIn Stock: 2499HCPL0661 Datasheet

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HCPL-0661

Broadcom LimitedIn Stock: 2450HCPL-0661 Datasheet

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HCPL-0661-500E

Broadcom LimitedIn Stock: 29167HCPL-0661-500E Datasheet

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VO0661T

Vishay Semiconductor Opto DivisionIn Stock: 3468VO0661T Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HCPL0661 is determined by the following critical parameters: number of channels (2), isolation voltage (3750Vrms minimum), output type (open collector or open drain configuration), current rating per channel (50 mA), data rate (10Mbps), supply voltage range (4.5V ~ 5.5V), and package form factor (8-SOIC). The identified substitute parts maintain these core electrical and mechanical specifications, ensuring functional compatibility in existing circuit designs.

The HCPL-0661 (Broadcom Limited) and HCPL-0661-500E (Broadcom Limited) are direct functional equivalents with identical channel count, isolation voltage, output configuration, and package specifications. The VO0661T (Vishay Semiconductor Opto Division) provides an alternative with equivalent electrical performance and slightly enhanced isolation voltage (4000Vrms), though with open drain output topology instead of open collector Schottky clamped configuration.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete HCPL0661, the HCPL-0661-500E (Broadcom Limited) is the primary substitute. This part maintains identical electrical specifications, package form factor, and operating parameters while offering active product status and ROHS3 compliance. The HCPL-0661-500E is available in Cut Tape and Digi-Reel packaging with substantial inventory availability.

The HCPL-0661 (Broadcom Limited, Tube packaging) provides an equivalent alternative with identical core specifications but carries RoHS non-compliant status. This variant is suitable for applications where RoHS compliance is not a requirement.

The VO0661T (Vishay Semiconductor Opto Division) serves as a secondary substitute option, offering enhanced isolation voltage (4000Vrms versus 3750Vrms) and extended operating temperature range (-40°C to 100°C). The open drain output configuration requires circuit topology verification to ensure compatibility with existing pull-up resistor networks and load conditions. This part carries ROHS3 compliance and active product status.

Frequently Asked Questions (FAQ)

Q: Can HCPL-0661-500E directly replace HCPL0661 in existing designs? A: Yes. The HCPL-0661-500E maintains identical isolation voltage (3750Vrms), channel count (2), output type (open collector Schottky clamped), current rating (50 mA per channel), data rate (10Mbps), supply voltage range (4.5V ~ 5.5V), and 8-SOIC package specifications. Propagation delay increases from 75ns to 100ns maximum, which is acceptable for most applications operating at 10Mbps data rates.

Q: What is the difference between HCPL-0661 and HCPL-0661-500E? A: Both parts are manufactured by Broadcom Limited with identical electrical and mechanical specifications. The primary differences are packaging format (Tube versus Cut Tape & Digi-Reel) and RoHS compliance status (non-compliant versus ROHS3 compliant). The HCPL-0661-500E is recommended for new designs and applications requiring RoHS compliance.

Q: Is VO0661T compatible with HCPL0661 applications? A: The VO0661T provides functional compatibility with equivalent channel count, output current rating, data rate, and supply voltage specifications. The open drain output topology differs from the open collector Schottky clamped configuration of HCPL0661. Circuit designs using pull-up resistors to logic supply voltages will function with VO0661T. The enhanced isolation voltage (4000Vrms) and extended temperature range (-40°C to 100°C) provide additional design margin for demanding applications.

Q: Why does HCPL0661 show higher Common Mode Transient Immunity (25kV/µs) than substitute parts (15kV/µs)? A: The HCPL0661 specification of 25kV/µs represents the maximum rated CMTI performance of the onsemi design. Broadcom and Vishay substitute parts are rated at 15kV/µs, which remains suitable for standard industrial and commercial applications. Applications requiring CMTI performance exceeding 15kV/µs should retain the original HCPL0661 design or consult manufacturer datasheets for alternative high-performance optoisolator families.

Q: What packaging options are available for substitute parts? A: HCPL-0661 is supplied in Tube packaging. HCPL-0661-500E is available in Cut Tape (CT) and Digi-Reel packaging formats. VO0661T is supplied in Tape & Reel (TR) format. All three parts maintain the 8-SOIC (0.154", 3.90mm Width) package form factor compatible with standard surface mount assembly processes.