HCPL0731R1 Equivalent & Substitute Parts

Part Overview

The HCPL0731R1 is a 2-channel optoisolator with Darlington output manufactured by onsemi, rated for 2500Vrms isolation voltage. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production requirements. The part operates with a current transfer ratio range of 400% to 5000% at 500µA input current and supports output currents up to 60mA per channel in an 8-SOIC surface mount package.

Substiute Parts

HCPL0731R1

onsemiIn Stock: 835HCPL0731R1 Datasheet

Current PartRFQ

HCPL0731R2

onsemiIn Stock: 1958HCPL0731R2 Datasheet

Parametric EquivalentRFQ

HCPL-073A

Broadcom LimitedIn Stock: 2282HCPL-073A Datasheet

SimilarRFQ

HCPL-073A-000E

Broadcom LimitedIn Stock: 1558HCPL-073A-000E Datasheet

SimilarRFQ

HCPL-073A-500E

Broadcom LimitedIn Stock: 2831HCPL-073A-500E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HCPL0731R1 is determined by the following critical parameters:

• Number of Channels: Must be 2
• Output Type: Must be Darlington
• Package / Case: Must be 8-SOIC (0.154", 3.90mm Width)
• Mounting Type: Must be Surface Mount
• Input Type: Must be DC
• Voltage - Isolation: Minimum 2500Vrms (equal or higher acceptable)
• Current - Output / Channel: Minimum 60mA (equal or higher acceptable)
• Voltage - Output (Max): Minimum 18V (equal or higher acceptable)

Substitute parts are grouped into two categories:

Parametric Equivalent: HCPL0731R2 maintains identical electrical specifications and package configuration as the main part, with the distinction of active product status and Tape & Reel packaging.

Similar Equivalents: HCPL-073A, HCPL-073A-000E, and HCPL-073A-500E are manufactured by Broadcom Limited and feature enhanced isolation voltage (3750Vrms), higher current transfer ratios, and improved performance characteristics while maintaining the same 2-channel Darlington output configuration and 8-SOIC package footprint.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalent)

HCPL0731R2 is the primary substitute for HCPL0731R1. Both parts maintain identical electrical specifications, channel configuration, and package footprint. HCPL0731R2 is actively manufactured and available in Tape & Reel packaging, making it suitable for production environments. The part carries ROHS3 compliance certification, addressing regulatory requirements for new designs.

For Enhanced Performance Applications

The Broadcom HCPL-073A series (HCPL-073A, HCPL-073A-000E, HCPL-073A-500E) offers superior isolation voltage (3750Vrms versus 2500Vrms) and higher current transfer ratios (600% to 8000% versus 400% to 5000%). These parts are pin-compatible and maintain the same 8-SOIC package footprint. Selection among the three variants depends on packaging requirements: bulk (HCPL-073A), tube (HCPL-073A-000E), or cut tape with Digi-Reel (HCPL-073A-500E). HCPL-073A-000E and HCPL-073A-500E carry ROHS3 compliance; HCPL-073A does not.

Compliance Considerations

For applications requiring RoHS3 compliance, HCPL0731R2, HCPL-073A-000E, and HCPL-073A-500E are compliant options. The standard HCPL-073A variant is RoHS non-compliant and should be avoided in regulated applications.

Operating Temperature Range

The HCPL0731R1 and HCPL0731R2 support -40°C to 85°C operation. The Broadcom HCPL-073A series operates within 0°C to 70°C. Applications requiring extended low-temperature operation below 0°C must use onsemi parts.

Frequently Asked Questions (FAQ)

Q: Can HCPL0731R2 be used as a direct replacement for HCPL0731R1?

A: Yes. HCPL0731R2 is a parametric equivalent with identical electrical specifications, channel count, output type, and package configuration. The primary differences are active product status and Tape & Reel packaging format.

Q: What are the key differences between HCPL0731R2 and the Broadcom HCPL-073A series?

A: HCPL0731R2 maintains the original 2500Vrms isolation specification and 400-5000% current transfer ratio range. The HCPL-073A series provides enhanced isolation (3750Vrms) and higher current transfer ratios (600-8000%). Both maintain identical package footprints and output current ratings. The HCPL-073A series exhibits slower switching times (3µs/34µs versus 300ns/1.6µs) and narrower operating temperature range (0°C to 70°C versus -40°C to 85°C).

Q: Are the Broadcom HCPL-073A variants interchangeable with each other?

A: Yes. HCPL-073A, HCPL-073A-000E, and HCPL-073A-500E are electrically identical. The designations reflect packaging format only: bulk, tube, and cut tape with Digi-Reel respectively. Selection depends on procurement and assembly requirements.

Q: Which substitute part should be selected for new production designs?

A: HCPL0731R2 is recommended for designs requiring exact electrical equivalence and extended temperature range. For applications where enhanced isolation voltage and higher current transfer ratios provide system benefits, HCPL-073A-000E or HCPL-073A-500E are preferred due to ROHS3 compliance certification.

Q: What packaging options are available for each substitute part?

A: HCPL0731R2 is supplied in Tape & Reel format. HCPL-073A is available in bulk packaging. HCPL-073A-000E is supplied in tubes. HCPL-073A-500E is available in cut tape with Digi-Reel packaging. All parts maintain identical 8-SOIC package dimensions.

Q: Are there temperature range limitations when substituting with Broadcom parts?

A: Yes. The HCPL-073A series operates within 0°C to 70°C, compared to -40°C to 85°C for onsemi parts. Applications requiring operation below 0°C or above 70°C must use HCPL0731R2 or remain with the original HCPL0731R1 if still available.

Q: What is the impact of lower forward current (If) in the Broadcom parts?

A: The HCPL-073A series specifies maximum forward current of 5mA compared to 20mA for onsemi parts. This indicates improved LED efficiency in the Broadcom design. Input circuit design must accommodate this specification difference to ensure proper optical coupling performance.