FOD2743AS Equivalent & Substitute Parts

Part Overview

The FOD2743AS is an optoisolator with transistor output manufactured by onsemi, designed for 5000Vrms isolation applications. This component features a single channel configuration with 8-SMD surface mount packaging and is rated for -40°C to 85°C operating temperature range. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

FOD2743AS

onsemiIn Stock: 978FOD2743AS Datasheet

Current PartRFQ

FOD2743BS

Fairchild SemiconductorIn Stock: 1041FOD2743BS Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FOD2743AS is determined by strict equivalence across the following critical parameters:

• Voltage - Isolation: 5000Vrms (primary isolation specification)
• Number of Channels: 1 (functional configuration)
• Output Type: Transistor (output stage architecture)
• Current Transfer Ratio: 50% @ 1mA minimum, 100% @ 1mA maximum (transfer efficiency)
• Voltage - Output (Max): 70V (maximum output voltage rating)
• Current - Output / Channel: 50mA (output current capacity)
• Package / Case: 8-SMD, Gull Wing (physical and electrical interface)
• Operating Temperature: -40°C ~ 85°C (thermal operating range)

The FOD2743BS from Fairchild Semiconductor meets all specified parameters and qualifies as a direct substitute for the obsolete FOD2743AS.

Parameter Comparison

Engineering Selection Recommendations

The FOD2743BS is the qualified substitute for the obsolete FOD2743AS. Both components share identical electrical specifications and physical packaging, ensuring direct compatibility in circuit applications. The FOD2743BS maintains active product status with Fairchild Semiconductor, providing supply continuity and ongoing technical support. Both parts carry equivalent compliance certifications (ECCN: EAR99, HTSUS: 8541.49.8000) and identical moisture sensitivity ratings (MSL 1). Selection of the FOD2743BS eliminates obsolescence risk while maintaining full functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can the FOD2743BS directly replace the FOD2743AS in existing designs?

A: Yes. The FOD2743BS is electrically and mechanically identical to the FOD2743AS across all specified parameters, including isolation voltage, output current, transfer ratio, saturation voltage, and package configuration. No circuit modifications are required.

Q: What is the primary reason for substitution?

A: The FOD2743AS is classified as obsolete. The FOD2743BS provides equivalent functionality with active product status, ensuring long-term availability and supply chain stability.

Q: Are there any compliance or certification differences?

A: No. Both parts carry identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications, and both maintain MSL 1 (Unlimited) moisture sensitivity ratings.

Q: Does the 8-SMD, Gull Wing package remain the same?

A: Yes. Both the FOD2743AS and FOD2743BS use identical 8-SMD surface mount packaging with gull wing lead configuration, ensuring compatibility with existing PCB layouts and assembly processes.

Q: Are the electrical performance characteristics identical?

A: Yes. Both parts specify 5000Vrms isolation voltage, 50-100% current transfer ratio at 1mA, 70V maximum output voltage, 50mA output current per channel, 1.07V typical forward voltage, and 400mV maximum Vce saturation across the -40°C to 85°C operating temperature range.