SMF8.5AT1G Equivalent & Substitute Parts

Part Overview

The SMF8.5AT1G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. This component features an 8.5V reverse standoff voltage with a 14.4V maximum clamping voltage and 13.9A peak pulse current capability in a surface-mount SOD-123FL package. The part is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and component procurement.

Substiute Parts

SMF8.5AT1G

onsemiIn Stock: 10134SMF8.5AT1G Datasheet

Current PartRFQ

SMF8.5A

MeritekIn Stock: 17461SMF8.5A Datasheet

DirectRFQ

SMF8.5A-TP

Micro Commercial CoIn Stock: 739SMF8.5A-TP Datasheet

DirectRFQ

SMF85A-T13

Littelfuse Inc.In Stock: 1010SMF85A-T13 Datasheet

DirectRFQ

SMF8V5A-E3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 3290SMF8V5A-E3-08 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMF8.5AT1G is determined by strict alignment of electrical and mechanical parameters. The critical parameters governing substitution are:

• Voltage - Reverse Standoff (Typ): 8.5V
• Voltage - Clamping (Max) @ Ipp: 14.4V
• Current - Peak Pulse (10/1000µs): 13.9A (±0.1A tolerance acceptable)
• Power - Peak Pulse: 200W
• Package / Case: SOD-123F or equivalent mechanical footprint
• Type: Unidirectional Zener TVS Diode
• Unidirectional Channels: 1

Parts are classified as direct substitutes when all electrical parameters match within specified tolerances and the package footprint is identical or pin-compatible. The SMF8.5A (Meritek) and SMF8.5A-TP (Micro Commercial Co) meet these criteria. The SMF8V5A-E3-08 (Vishay) is classified as a similar substitute due to package variation (DO-219AB vs. SOD-123F), though electrical parameters are identical.

The SMF85A-T13 (Littelfuse Inc.) does not qualify as a substitute due to significantly different electrical specifications (85V standoff voltage, 137V clamping voltage, 1.3A peak pulse current).

Parameter Comparison

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete SMF8.5AT1G, the SMF8.5A (Meritek) and SMF8.5A-TP (Micro Commercial Co) are the primary candidates. Both parts maintain identical electrical specifications and are currently in active production status with REACH compliance confirmed.

The SMF8.5A (Meritek) is supplied in Tape & Reel packaging with 17,400 units in stock, providing optimal availability for volume procurement. The SMF8.5A-TP (Micro Commercial Co) is available in bulk packaging with 706 units in stock and supports an extended operating temperature range (-65 to 175°C) compared to the original specification (-55 to 150°C).

The SMF8V5A-E3-08 (Vishay) offers identical electrical performance and extended temperature range but uses the DO-219AB package footprint instead of SOD-123F. This part is suitable only when PCB layout accommodates the alternative package geometry. Vishay's eSMP® series designation and ROHS3 compliance are confirmed.

All recommended substitutes carry REACH Unaffected status and EAR99 export classification matching the original part.

Frequently Asked Questions (FAQ)

Q: Can SMF8.5A (Meritek) be used as a direct replacement for SMF8.5AT1G?

A: Yes. The SMF8.5A matches all critical electrical parameters: 8.5V reverse standoff voltage, 14.4V clamping voltage, and 13.89A peak pulse current. Both use SOD-123F package footprints and are rated for -55 to 150°C operation. The part is in active production with confirmed ROHS3 compliance.

Q: What is the difference between SMF8.5A-TP and SMF8.5A?

A: Both parts share identical electrical specifications and package footprint (SOD-123F). The primary differences are manufacturer (Micro Commercial Co vs. Meritek), packaging format (bulk vs. Tape & Reel), and operating temperature range (SMF8.5A-TP extends to -65 to 175°C). Select based on procurement requirements and thermal environment.

Q: Why is SMF8V5A-E3-08 listed as a similar substitute rather than direct substitute?

A: The SMF8V5A-E3-08 uses the DO-219AB package instead of SOD-123F. While electrical parameters are identical, the package footprint differs, requiring PCB layout verification before implementation. This part is suitable only when the alternative package geometry is accommodated in the design.

Q: Is SMF85A-T13 compatible with SMF8.5AT1G applications?

A: No. The SMF85A-T13 has fundamentally different electrical specifications: 85V reverse standoff voltage, 137V clamping voltage, and 1.3A peak pulse current. These parameters are not interchangeable with the 8.5V / 14.4V / 13.9A ratings of the SMF8.5AT1G.

Q: What compliance certifications should I verify for substitute parts?

A: All recommended substitutes carry REACH Unaffected status and EAR99 export classification. The SMF8.5A (Meritek) and SMF8V5A-E3-08 (Vishay) are ROHS3 compliant. Verify RoHS compliance requirements for your specific application and region.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. The SMF8.5A (Meritek) has 17,400 units in stock, providing the highest availability. The SMF8V5A-E3-08 (Vishay) has 3,200 units available. The SMF8.5A-TP (Micro Commercial Co) has limited stock at 706 units. Consider lead time and volume requirements for your procurement timeline.