HCPL2731SV Optoisolator Equivalent & Substitute Parts

Part Overview

The HCPL2731SV 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 equivalent and substitute parts for ongoing design support and procurement continuity. The HCPL2731SV operates across the industrial temperature range of -40°C to 85°C and is packaged in 8-SMD Gull Wing configuration suitable for surface mount applications.

Substiute Parts

HCPL2731SV

onsemiIn Stock: 782HCPL2731SV Datasheet

Current PartRFQ

HCPL2731SD

onsemiIn Stock: 3156HCPL2731SD Datasheet

DirectRFQ

HCPL-273L-500E

Broadcom LimitedIn Stock: 781HCPL-273L-500E Datasheet

SimilarRFQ

HCPL-4731#300

Broadcom LimitedIn Stock: 1135HCPL-4731#300 Datasheet

SimilarRFQ

HCPL-4731-320E

Broadcom LimitedIn Stock: 875HCPL-4731-320E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HCPL2731SV is determined by the following critical parameters: number of channels (2), output type (Darlington), isolation voltage rating, maximum output voltage, output current per channel (60mA), and package configuration (8-SMD Gull Wing). Substitute parts are classified into two categories:

Direct Equivalent: Parts maintaining identical electrical specifications and package type, differing only in packaging format or compliance status.

Similar Substitute: Parts with enhanced isolation voltage, modified current transfer ratios, or different timing characteristics that remain functionally compatible within the same application class.

The HCPL2731SV requires substitutes capable of supporting 2-channel Darlington output with minimum 60mA per channel and compatible SMD packaging. Isolation voltage may be equal or higher; however, output voltage and current ratings must not be lower than the original specification.

Parameter Comparison

Engineering Selection Recommendations

HCPL2731SD (Direct Equivalent): This onsemi part maintains identical electrical specifications to the HCPL2731SV with matching isolation voltage (2500Vrms), output voltage (18V), and current ratings (60mA per channel). The primary difference is packaging format (Cut Tape & Digi-Reel versus standard SMD) and RoHS3 compliance status. This part is recommended as the primary direct replacement when procurement of the obsolete HCPL2731SV is not feasible. Product status remains obsolete.

HCPL-273L-500E (Similar Substitute - Higher Isolation): Manufactured by Broadcom Limited, this part provides enhanced isolation voltage (3750Vrms) compared to the original specification. However, the maximum output voltage is reduced to 7V, which may limit compatibility in applications requiring the full 18V output capability of the HCPL2731SV. This part is suitable only for applications where the lower output voltage is acceptable. Product status is active with RoHS3 compliance.

HCPL-4731#300 (Similar Substitute - Enhanced Performance): This Broadcom part offers higher isolation voltage (3750Vrms) and maintains the 18V maximum output voltage. The current transfer ratio is enhanced (600% @ 500µA), and timing characteristics differ (3µs, 34µs versus 300ns, 5µs). Operating temperature range is narrower (0°C to 70°C). This part is suitable for applications not requiring the extended -40°C to 85°C temperature range. Product status is active but RoHS non-compliant.

HCPL-4731-320E (Similar Substitute - Maximum Isolation): This Broadcom part provides the highest isolation voltage (5000Vrms) with maintained 18V output voltage and 60mA per channel current. Timing and current transfer ratio characteristics match HCPL-4731#300. Operating temperature range is 0°C to 70°C. This part is suitable for high-isolation applications where extended temperature operation is not required. Product status is active with RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can HCPL2731SD be used as a direct replacement for HCPL2731SV?

A: Yes. HCPL2731SD maintains identical electrical specifications including 2500Vrms isolation, 18V maximum output voltage, and 60mA per channel current. Both parts are obsolete; however, HCPL2731SD offers improved RoHS3 compliance status and greater current availability.

Q: What is the primary limitation of HCPL-273L-500E as a substitute?

A: The maximum output voltage is reduced to 7V compared to the 18V specification of HCPL2731SV. Applications requiring output voltages above 7V are not compatible with this substitute. Additionally, the operating temperature range is narrower (0°C to 70°C versus -40°C to 85°C).

Q: Are the Broadcom HCPL-4731 series parts suitable for all HCPL2731SV applications?

A: The HCPL-4731 series maintains the 18V output voltage and 60mA per channel current, making them electrically compatible for most applications. However, the operating temperature range is limited to 0°C to 70°C. Applications requiring operation below 0°C or above 70°C are not compatible. Additionally, timing characteristics differ significantly (3µs, 34µs versus 300ns, 5µs).

Q: What is the difference between HCPL-4731#300 and HCPL-4731-320E?

A: Both parts share identical electrical characteristics and timing specifications. The primary difference is isolation voltage: HCPL-4731#300 provides 3750Vrms isolation, while HCPL-4731-320E provides 5000Vrms isolation. HCPL-4731-320E is recommended for applications requiring maximum isolation voltage. HCPL-4731-320E also maintains RoHS3 compliance, whereas HCPL-4731#300 is RoHS non-compliant.

Q: Is package compatibility maintained across all substitute parts?

A: Yes. All substitute parts listed maintain the 8-SMD Gull Wing package configuration, ensuring mechanical and electrical compatibility with existing PCB layouts designed for HCPL2731SV.

Q: Which substitute part is recommended for new designs?

A: For new designs requiring the extended temperature range (-40°C to 85°C), HCPL2731SD is recommended as it maintains all original specifications with improved compliance status. For applications where temperature range can be limited to 0°C to 70°C, HCPL-4731-320E is recommended due to its active product status, RoHS3 compliance, and enhanced isolation voltage (5000Vrms).