HCPL3700W Equivalent & Substitute Parts

Part Overview

The HCPL3700W is a 2500Vrms optoisolator with Darlington output configuration, manufactured by onsemi in 8-DIP through-hole packaging. This component provides galvanic isolation for AC/DC logic interface applications with single-channel operation and 30mA output current capability. The part is currently obsolete, making equivalent substitutes necessary for ongoing system support and new designs requiring this isolation topology.

Substiute Parts

HCPL3700W

onsemiIn Stock: 1375HCPL3700W Datasheet

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HCPL3700

Fairchild SemiconductorIn Stock: 3342HCPL3700 Datasheet

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HCPL-3760

Broadcom LimitedIn Stock: 4215HCPL-3760 Datasheet

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HCPL-3760-000E

Broadcom LimitedIn Stock: 9562HCPL-3760-000E Datasheet

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HCPL-3760-060E

Broadcom LimitedIn Stock: 859HCPL-3760-060E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the HCPL3700W is determined by matching critical electrical and mechanical parameters: isolation voltage rating, Darlington output configuration, single-channel topology, 30mA output current, AC/DC input capability, and through-hole 8-DIP package format. The substitute parts are grouped into two categories based on isolation voltage performance:

Category 1 - Direct Voltage Match (2500Vrms): HCPL3700 from Fairchild Semiconductor maintains identical isolation voltage and all switching characteristics, providing direct functional equivalence.

Category 2 - Enhanced Isolation (3750Vrms): HCPL-3760, HCPL-3760-000E, and HCPL-3760-060E from Broadcom Limited exceed the isolation voltage requirement at 3750Vrms while maintaining all other critical parameters. These parts offer superior isolation margin and faster switching performance (4.5µs turn-on vs. 6µs).

Parameter Comparison

Engineering Selection Recommendations

HCPL3700 (Fairchild Semiconductor) is the direct functional equivalent for applications requiring exact parameter matching at 2500Vrms isolation. This part maintains identical electrical performance and switching characteristics. Product status is active, ensuring availability for new procurement.

HCPL-3760, HCPL-3760-000E, and HCPL-3760-060E (Broadcom Limited) are suitable for applications where enhanced isolation voltage (3750Vrms) provides system margin benefits. These parts deliver faster switching performance with reduced turn-on and turn-off times. All three variants are ROHS3 compliant and carry active product status. Selection between the three HCPL-3760 variants depends on specific packaging and lead-time requirements, as electrical specifications are identical.

Package dimension differences exist between the original HCPL3700W (0.400" body width) and substitute parts (0.300" body width). PCB layout verification is required to confirm mechanical compatibility with existing through-hole footprints.

Frequently Asked Questions (FAQ)

Q: Can HCPL-3760 series parts directly replace HCPL3700W in existing designs?

A: Electrical substitution is valid based on matching Darlington output, single-channel topology, 30mA output current, and AC/DC input capability. However, the HCPL-3760 series has a narrower 8-DIP package body (0.300" vs. 0.400"), requiring PCB footprint verification before implementation.

Q: What is the significance of the 3750Vrms isolation rating on HCPL-3760 compared to the 2500Vrms HCPL3700W?

A: The HCPL-3760 series provides 50% higher isolation voltage margin. This enhanced rating does not change functional operation but offers greater safety margin in high-voltage isolation applications. All other electrical parameters remain compatible.

Q: Are HCPL-3760, HCPL-3760-000E, and HCPL-3760-060E electrically identical?

A: Yes. These three part numbers share identical electrical specifications, isolation voltage, switching characteristics, and output ratings. Differences are limited to packaging format and manufacturing date codes. Selection should be based on inventory availability and lead-time requirements.

Q: Does the faster switching performance of HCPL-3760 (4.5µs turn-on vs. 6µs) affect circuit design?

A: The HCPL-3760 series exhibits faster switching times across all parameters (turn-on, turn-off, rise, and fall times). In applications sensitive to propagation delay, this represents an improvement. Existing circuit designs do not require modification, as faster switching is backward-compatible with timing requirements established for the original HCPL3700W.

Q: What compliance certifications apply to substitute parts?

A: HCPL-3760 series parts carry ROHS3 compliance certification. All substitute parts maintain REACH Unaffected status and EAR99 export classification consistent with the original HCPL3700W.