HCPL2731 Equivalent & Substitute Parts

Part Overview

The HCPL2731 is a 2-channel optoisolator with Darlington output manufactured by onsemi, rated for 2500Vrms isolation voltage. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The HCPL2731 provides galvanic isolation in applications requiring high-speed switching and low-power signal transmission across isolated domains.

Substiute Parts

HCPL2731

onsemiIn Stock: 1147HCPL2731 Datasheet

Current PartRFQ

HCPL2731M

onsemiIn Stock: 6010HCPL2731M Datasheet

MFR RecommendedRFQ

HCPL2731V

onsemiIn Stock: 832HCPL2731V Datasheet

Parametric EquivalentRFQ

HCPL-2731

Broadcom LimitedIn Stock: 1376HCPL-2731 Datasheet

SimilarRFQ

HCPL-2731-000E

Broadcom LimitedIn Stock: 1242HCPL-2731-000E Datasheet

SimilarRFQ

HCPL-4731

Broadcom LimitedIn Stock: 2354HCPL-4731 Datasheet

SimilarRFQ

HCPL-4731-000E

Broadcom LimitedIn Stock: 2316HCPL-4731-000E Datasheet

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HCPL-4731-020E

Broadcom LimitedIn Stock: 803HCPL-4731-020E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the HCPL2731 is determined by the following critical parameters: number of channels (2), output type (Darlington), package type (8-DIP), mounting method (Through Hole), and electrical compatibility across isolation voltage, current transfer ratio, output voltage, and output current ratings.

The substitute parts are grouped into three categories:

MFR Recommended Substitute: HCPL2731M meets all electrical specifications of the original part while offering enhanced isolation voltage (5000Vrms vs. 2500Vrms) and extended operating temperature range (-40°C ~ 100°C vs. -40°C ~ 85°C). This part maintains identical channel count, output type, package, and core electrical parameters.

Parametric Equivalent: HCPL2731V provides identical electrical and thermal specifications to the original HCPL2731, differing only in product status classification.

Similar Alternatives: HCPL-2731, HCPL-2731-000E, HCPL-4731, HCPL-4731-000E, and HCPL-4731-020E are manufactured by Broadcom Limited and share the same 2-channel Darlington configuration, 8-DIP package, and core output specifications. These parts vary in isolation voltage ratings (3750Vrms to 5000Vrms), current transfer ratio specifications, and operating temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

For New Designs: HCPL2731M is the primary recommendation. It is manufactured by onsemi (original manufacturer), maintains active product status, and provides superior isolation voltage (5000Vrms) with extended operating temperature range (-40°C ~ 100°C). ROHS3 compliance ensures regulatory alignment for modern applications.

For Direct Replacement in Existing Designs: HCPL2731V provides identical electrical specifications and thermal performance to the original HCPL2731, though both are classified as obsolete. This option is suitable only when isolation voltage of 2500Vrms is specifically required and cannot be upgraded.

For Broadcom-Based Alternatives: HCPL-2731-000E and HCPL-4731-000E offer ROHS3 compliance and active product status. HCPL-4731-000E provides 3750Vrms isolation with higher current transfer ratio (600% @ 500µA) and lower forward voltage (1.25V), making it suitable for applications requiring improved switching performance. HCPL-4731-020E extends isolation to 5000Vrms while maintaining the same electrical characteristics.

Compliance Considerations: Applications requiring ROHS3 compliance should avoid HCPL-2731 and HCPL-4731 (non-compliant versions). Select HCPL-2731M, HCPL-2731-000E, HCPL-4731-000E, or HCPL-4731-020E.

Temperature Range Constraints: Applications operating below 0°C or above 70°C require HCPL2731M (rated to -40°C ~ 100°C). Broadcom alternatives are limited to 0°C ~ 70°C operating range.

Frequently Asked Questions (FAQ)

Q: Can HCPL2731M directly replace HCPL2731 in existing PCB designs?

A: Yes. Both parts use identical 8-DIP (0.300", 7.62mm) through-hole packaging and pinout. HCPL2731M provides enhanced isolation voltage (5000Vrms vs. 2500Vrms) and extended operating temperature range, making it a superior drop-in replacement.

Q: What is the key difference between HCPL-2731 and HCPL-4731 from Broadcom?

A: Both are 2-channel Darlington optoisolators in 8-DIP packages with 3750Vrms isolation. HCPL-4731 offers higher current transfer ratio (600% @ 500µA vs. 500% @ 1.6mA), lower forward voltage (1.25V vs. 1.4V), and lower maximum forward current (10mA vs. 12mA), resulting in improved switching performance and reduced input power requirements.

Q: Is HCPL-4731-020E suitable for applications requiring 5000Vrms isolation?

A: Yes. HCPL-4731-020E is rated for 5000Vrms isolation, matching HCPL2731M. Both parts maintain identical output specifications (18V max, 60mA per channel) and 8-DIP packaging. HCPL-4731-020E is ROHS3 compliant and active in production.

Q: Why do some substitute parts have lower operating temperature ranges?

A: Broadcom alternatives (HCPL-2731 series and HCPL-4731 series) are specified for 0°C ~ 70°C operation, while onsemi HCPL2731M extends to -40°C ~ 100°C. Applications requiring extended temperature operation must select HCPL2731M.

Q: Are all substitute parts ROHS3 compliant?

A: No. HCPL-2731 and HCPL-4731 (non-suffixed versions) are RoHS non-compliant. HCPL2731M, HCPL-2731-000E, HCPL-4731-000E, and HCPL-4731-020E are ROHS3 compliant. Select compliant versions for applications subject to ROHS regulations.

Q: What is the significance of the "-000E" and "-020E" suffixes on Broadcom parts?

A: These suffixes denote packaging and specification variants. "-000E" and "-020E" versions are ROHS3 compliant and available in tube packaging. The "-020E" variant specifically indicates 5000Vrms isolation rating.