SFH6756T Equivalent & Substitute Parts

Part Overview

The SFH6756T is a 2-channel logic output optoisolator manufactured by Vishay Semiconductor Opto Division, designed for high-speed digital isolation applications. It features 4000Vrms isolation voltage, 10MBd data rate, and open drain output configuration in an 8-SOIC surface mount package. The part is currently in Last Time Buy status, making identification of equivalent alternatives essential for ongoing design support and procurement planning.

Substiute Parts

SFH6756T

Vishay Semiconductor Opto DivisionIn Stock: 1413SFH6756T Datasheet

Current PartRFQ

VOIH063AT

Vishay Semiconductor Opto DivisionIn Stock: 5057VOIH063AT Datasheet

MFR RecommendedRFQ

VO0631T

Vishay Semiconductor Opto DivisionIn Stock: 5611VO0631T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SFH6756T are identified based on the following critical parameters that define functional equivalence:

Primary Matching Criteria:

• Number of channels: 2 channels required
• Package type: 8-SOIC surface mount form factor
• Output configuration: Open drain topology
• Data rate: 10MBd minimum
• Isolation voltage: 4000Vrms or higher
• Output current capability: 50 mA per channel
• Supply voltage compatibility: 4.5V ~ 5.5V operation

Acceptable Parameter Variations:

• Isolation voltage may exceed 4000Vrms (higher isolation is acceptable)
• Common mode transient immunity may exceed 5kV/µs (improved performance acceptable)
• Propagation delay and rise/fall times may be faster (improved timing acceptable)
• Operating temperature range may be extended (wider range acceptable)
• Forward voltage and forward current specifications may differ within component design tolerances

Parameter Comparison

Engineering Selection Recommendations

VO0631T provides direct functional equivalence to the SFH6756T with identical electrical specifications across isolation voltage, CMTI, data rate, output current, and supply voltage range. Both parts maintain the same propagation delay and rise/fall time characteristics. VO0631T is in Active product status, ensuring long-term availability and supply continuity. The primary difference is packaging format: VO0631T is supplied in Cut Tape and Digi-Reel format rather than standard Tape & Reel. This part is suitable for direct replacement in applications where the SFH6756T is currently specified.

VOIH063AT offers enhanced performance characteristics including faster propagation delay (90ns/75ns vs. 100ns/100ns), improved rise/fall times (11ns/2.3ns vs. 23ns/7ns), and superior common mode transient immunity (15kV/µs vs. 5kV/µs). VOIH063AT supports dual supply voltage operation (2.7V ~ 3.6V and 4.5V ~ 5.5V), providing additional design flexibility. The isolation voltage is 3750Vrms, which is 250Vrms lower than the SFH6756T specification. VOIH063AT is in Active product status with extended operating temperature range (-40°C ~ 110°C). This part is suitable for applications where the lower isolation voltage is acceptable and where improved timing performance or dual supply capability provides design advantages.

Both substitute parts are ROHS3 compliant with MSL 1 rating, matching the environmental and reliability characteristics of the SFH6756T.

Frequently Asked Questions (FAQ)

Q: Can VO0631T be used as a direct replacement for SFH6756T?

A: Yes. VO0631T matches all critical electrical parameters including isolation voltage (4000Vrms), CMTI (5kV/µs), data rate (10MBd), output current (50 mA), and supply voltage range (4.5V ~ 5.5V). Both parts use identical 8-SOIC packaging. The only difference is the packaging format (Cut Tape/Digi-Reel vs. Tape & Reel), which does not affect electrical performance or PCB mounting.

Q: Is VOIH063AT compatible with SFH6756T applications?

A: VOIH063AT is compatible with applications where the 3750Vrms isolation voltage meets system requirements. The lower isolation voltage is the primary consideration. VOIH063AT offers improved timing performance and higher CMTI, which may benefit high-speed or noise-sensitive applications. Both parts use the same 8-SOIC package and support 4.5V ~ 5.5V supply operation.

Q: What is the isolation voltage difference between SFH6756T and VOIH063AT?

A: SFH6756T provides 4000Vrms isolation, while VOIH063AT provides 3750Vrms isolation. This 250Vrms difference must be evaluated against system isolation requirements. If the application requires 4000Vrms isolation, VOIH063AT is not suitable. If the application requires 3750Vrms or lower, VOIH063AT is acceptable.

Q: Are all three parts ROHS3 compliant?

A: Yes. SFH6756T, VO0631T, and VOIH063AT are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level.

Q: What is the difference in packaging between VO0631T and SFH6756T?

A: SFH6756T is supplied in Tape & Reel (TR) format. VO0631T is supplied in Cut Tape (CT) and Digi-Reel® format. Both formats are suitable for automated PCB assembly. The choice between formats depends on procurement and handling requirements.

Q: Does VOIH063AT support lower supply voltages than SFH6756T?

A: Yes. VOIH063AT supports dual supply voltage ranges: 2.7V ~ 3.6V and 4.5V ~ 5.5V. SFH6756T and VO0631T support only 4.5V ~ 5.5V. If your application requires 3.3V or lower supply operation, VOIH063AT provides this capability.

Q: What is the product status of each part?

A: SFH6756T is Last Time Buy, indicating limited future availability. VO0631T and VOIH063AT are both Active products with ongoing manufacturing and supply support.