HCPL-4731-500E Equivalent & Substitute Parts

Part Overview

The HCPL-4731-500E is a 2-channel optoisolator with Darlington output manufactured by Broadcom Limited. This component provides 3750Vrms isolation voltage and is designed for applications requiring high-speed optical isolation in 8-DIP Gull Wing surface mount packaging. The part is currently active in production. Substitute parts are necessary when addressing supply constraints, packaging preferences, or specific performance requirements within compatible electrical and mechanical parameters.

Key Parameters

Parameter	HCPL-4731-500E
Manufacturer	Broadcom Limited
Number of Channels	2
Voltage - Isolation	3750Vrms
Current Transfer Ratio (Min)	600% @ 500µA
Output Type	Darlington
Voltage - Output (Max)	18V
Current - Output / Channel	60mA
Turn On / Turn Off Time (Typ)	3µs, 34µs
Operating Temperature	0°C ~ 70°C
Package / Case	8-SMD, Gull Wing
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the HCPL-4731-500E is determined by the following critical parameters:

Number of Channels: Must remain 2 channels
Output Type: Must be Darlington output
Package / Case: Must be 8-SMD, Gull Wing
Voltage - Output (Max): Must support minimum 18V
Current - Output / Channel: Must support minimum 60mA
Input Type: Must be DC

The substitute parts listed below maintain these core electrical and mechanical specifications. Variations in isolation voltage (3750Vrms vs. 2500Vrms), current transfer ratio, switching speed, and operating temperature range are secondary parameters that may be acceptable depending on application requirements, but do not prevent functional substitution within the optoisolator category.

Parameter Comparison

Parameter	HCPL-4731-500E	HCPL2730S	HCPL2730SD	HCPL2731S	HCPL2731SD
Manufacturer	Broadcom Limited	Fairchild Semiconductor	onsemi	onsemi	onsemi
Number of Channels	2	2	2	2	2
Voltage - Isolation	3750Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms
Current Transfer Ratio (Min)	600% @ 500µA	300% @ 1.6mA	300% @ 1.6mA	500% @ 1.6mA	500% @ 1.6mA
Output Type	Darlington	Darlington	Darlington	Darlington	Darlington
Voltage - Output (Max)	18V	7V	7V	18V	18V
Current - Output / Channel	60mA	60mA	60mA	60mA	60mA
Turn On / Turn Off Time (Typ)	3µs, 34µs	300ns, 5µs	300ns, 5µs	300ns, 5µs	300ns, 5µs
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing
Product Status	Active	Active	Obsolete	Obsolete	Obsolete
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

HCPL2730S (Fairchild Semiconductor): Active product status with compatible 2-channel Darlington configuration and 8-SMD Gull Wing package. Output voltage maximum of 7V is lower than the main part; suitable only for applications with output voltage requirements not exceeding 7V. Faster switching times (300ns, 5µs) compared to the main part.

HCPL2730SD (onsemi): Obsolete product status. While electrically compatible in channel count, output type, and package, the obsolete designation limits long-term availability and supply chain reliability. Output voltage maximum of 7V restricts application scope.

HCPL2731S (onsemi): Obsolete product status. Maintains 18V maximum output voltage matching the main part and 2-channel Darlington configuration. Obsolete status affects future procurement viability.

HCPL2731SD (onsemi): Obsolete product status. Maintains 18V maximum output voltage and 2-channel Darlington output. Obsolete designation limits suitability for new designs or long-term production requirements.

For new designs and applications requiring sustained supply, HCPL2730S remains the only active substitute with full ROHS3 compliance, provided output voltage requirements do not exceed 7V. For applications requiring 18V output capability, the main part HCPL-4731-500E is the recommended choice due to active product status.

Frequently Asked Questions (FAQ)

Q: Can HCPL2730S replace HCPL-4731-500E in all applications?

A: HCPL2730S is electrically compatible in channel count, output type, and package configuration. However, the maximum output voltage is 7V compared to 18V for the main part. Substitution is valid only for applications where output voltage does not exceed 7V.

Q: Why are HCPL2730SD, HCPL2731S, and HCPL2731SD listed as obsolete?

A: Product status is determined by manufacturer designation. Obsolete parts are no longer in active production and may have limited availability. These parts are listed for reference in legacy system documentation and reverse engineering applications only.

Q: What is the significance of the isolation voltage difference between 3750Vrms and 2500Vrms?

A: Isolation voltage determines the maximum voltage differential that can be safely applied across the optoisolator. The main part provides higher isolation capability. Substitution with lower isolation voltage is acceptable only if the application isolation requirements do not exceed 2500Vrms.

Q: Are all substitute parts available in the same packaging?

A: All listed substitutes use 8-SMD Gull Wing package configuration, maintaining mechanical compatibility with the main part footprint.

Q: What is the impact of switching time differences?

A: The main part has turn-on/turn-off times of 3µs and 34µs. Substitute parts offer faster switching (300ns and 5µs). Faster switching may be beneficial for high-frequency applications but does not prevent substitution in standard applications.

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