HCPL-2731#520 Equivalent & Substitute Parts

Part Overview

The HCPL-2731#520 is a 2-channel optoisolator with Darlington output, rated for 5000Vrms isolation voltage. This component is designed for applications requiring high-voltage isolation between logic and power circuits. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

HCPL-2731#520

Broadcom LimitedIn Stock: 840HCPL-2731#520 Datasheet

Current PartRFQ

HCPL-2731-520E

Broadcom LimitedIn Stock: 957HCPL-2731-520E Datasheet

DirectRFQ

HCPL2731S

onsemiIn Stock: 1131HCPL2731S Datasheet

MFR RecommendedRFQ

HCPL2731SD

onsemiIn Stock: 3156HCPL2731SD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HCPL-2731#520 is determined by the following critical parameters: number of channels (2), output type (Darlington), isolation voltage rating, current transfer ratio range, maximum output voltage (18V), output current per channel (60mA), and package configuration (8-SMD Gull Wing).

The substitute parts are grouped into two categories based on isolation voltage compliance:

Category 1: Direct Electrical Equivalent — Parts maintaining the 5000Vrms isolation specification with identical electrical performance characteristics.

Category 2: Reduced Isolation Voltage — Parts with 2500Vrms isolation rating, representing a lower isolation specification that may be suitable for applications not requiring the full 5000Vrms rating.

Parameter Comparison

Engineering Selection Recommendations

HCPL-2731-520E is the primary substitute for HCPL-2731#520. This part maintains identical electrical specifications including 5000Vrms isolation voltage, current transfer ratio range, and timing characteristics. The HCPL-2731-520E is currently in active production status and is ROHS3 compliant, providing regulatory compliance advantages over the discontinued original part. Packaging is supplied as Tape & Reel (TR), suitable for automated assembly processes.

HCPL2731S and HCPL2731SD are alternative substitutes with reduced isolation voltage (2500Vrms). Both parts are manufactured by onsemi and maintain identical channel count, output type, and current specifications. These parts feature faster turn-on time (300ns versus 5µs) and extended operating temperature range (-40°C to 85°C). Both are ROHS3 compliant. Selection of these alternatives is appropriate only for applications where 2500Vrms isolation meets the design requirement. HCPL2731SD is supplied in Cut Tape (CT) & Digi-Reel® packaging with higher inventory availability (3100 pcs).

Frequently Asked Questions (FAQ)

Q: Can HCPL-2731-520E be used as a direct replacement for HCPL-2731#520?

A: Yes. HCPL-2731-520E is electrically and mechanically identical to HCPL-2731#520, with the same 5000Vrms isolation rating, 2-channel Darlington output configuration, and 8-SMD Gull Wing package. The primary difference is product status (active versus discontinued) and RoHS compliance (ROHS3 compliant).

Q: What is the key difference between HCPL-2731-520E and HCPL2731S/HCPL2731SD?

A: The isolation voltage rating differs. HCPL-2731-520E maintains 5000Vrms isolation identical to the original part. HCPL2731S and HCPL2731SD are rated for 2500Vrms isolation. All other electrical parameters (channel count, output current, output voltage, current transfer ratio minimum) remain equivalent. Selection depends on the isolation voltage requirement of the application.

Q: Are the onsemi parts (HCPL2731S, HCPL2731SD) suitable replacements?

A: HCPL2731S and HCPL2731SD are suitable only if the application does not require 5000Vrms isolation. These parts provide equivalent functionality at 2500Vrms isolation with faster switching times and wider operating temperature range. Both are ROHS3 compliant and currently in stock.

Q: What packaging options are available for substitutes?

A: HCPL-2731-520E is supplied in Tape & Reel (TR) format. HCPL2731SD is supplied in Cut Tape (CT) & Digi-Reel® format. Both are 8-SMD Gull Wing packages suitable for surface mount assembly. HCPL2731S packaging details are not specified in available data.

Q: Are all substitute parts RoHS compliant?

A: HCPL-2731-520E, HCPL2731S, and HCPL2731SD are all ROHS3 compliant. The original HCPL-2731#520 is RoHS non-compliant. Compliance status should be verified against specific regulatory requirements for the end application.