SMF10AT1 Equivalent & Substitute Parts

Part Overview

The SMF10AT1 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. It features a 10V reverse standoff voltage with a 17V maximum clamping voltage and 11.8A peak pulse current capability in a surface mount SOD-123F package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement.

Substiute Parts

SMF10AT1

onsemiIn Stock: 898SMF10AT1 Datasheet

Current PartRFQ

SMF10A-E3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 20403SMF10A-E3-08 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMF10AT1 is determined by matching the following critical electrical parameters:

• Voltage - Reverse Standoff (Typ): 10V
• Voltage - Breakdown (Min): 11.1V
• Voltage - Clamping (Max) @ Ipp: 17V
• Current - Peak Pulse (10/1000µs): 11.8A
• Power - Peak Pulse: 200W
• Unidirectional Channels: 1
• Type: Zener

The SMF10A-E3-08 manufactured by Vishay General Semiconductor - Diodes Division meets all critical electrical specifications. While the substitute part uses a different surface mount package (DO-219AB/SMF versus SOD-123F), both packages are industry-standard surface mount formats suitable for automated assembly. The substitute part is currently in active production status with significantly higher inventory availability.

Parameter Comparison

Engineering Selection Recommendations

The SMF10A-E3-08 is the direct electrical equivalent for the obsolete SMF10AT1. Selection of the Vishay substitute is supported by the following factors:

• All critical electrical parameters match exactly: 10V standoff, 11.1V breakdown minimum, 17V clamping maximum, 11.8A peak pulse current, and 200W peak pulse power.
• The substitute part is in active production status with 20,300 units in stock, compared to the obsolete SMF10AT1 with limited remaining inventory of 830 units.
• The SMF10A-E3-08 offers an extended operating temperature range (-65°C to 175°C versus -55°C to 150°C), providing additional thermal margin for demanding applications.
• The substitute part achieves ROHS3 compliance, whereas the original part is RoHS non-compliant.
• Both parts are classified as EAR99 and REACH Unaffected with identical HTSUS codes, confirming regulatory equivalence.

Package transition from SOD-123F to DO-219AB (SMF) requires PCB layout modification. Both packages are standard surface mount formats with similar footprint dimensions suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Are the electrical characteristics of SMF10A-E3-08 identical to SMF10AT1?

A: Yes. Both parts share identical specifications for reverse standoff voltage (10V), breakdown voltage (11.1V minimum), clamping voltage (17V maximum), peak pulse current (11.8A), and peak pulse power (200W). Both are unidirectional Zener TVS diodes designed for general-purpose overvoltage protection.

Q: What is the difference between SOD-123F and DO-219AB (SMF) packages?

A: Both are surface mount packages for TVS diodes. SOD-123F and DO-219AB are industry-standard formats with different physical dimensions and land patterns. PCB layout and footprint design must be updated to accommodate the package change. Consult the respective datasheets for precise dimensional specifications.

Q: Can I use SMF10A-E3-08 as a direct replacement without PCB modification?

A: No. The package change from SOD-123F to DO-219AB requires PCB footprint redesign. However, the electrical performance is fully equivalent, and the substitute part is suitable for new designs or PCB revisions.

Q: Why is the SMF10AT1 listed as obsolete?

A: The SMF10AT1 has been discontinued by onsemi. The SMF10A-E3-08 from Vishay provides equivalent electrical performance and is actively manufactured, making it the recommended alternative for new procurement and design support.

Q: Does the extended temperature range of SMF10A-E3-08 affect compatibility?

A: No. The extended operating range (-65°C to 175°C versus -55°C to 150°C) is a superset of the original specification. Applications designed for the SMF10AT1 temperature range operate within the SMF10A-E3-08 specification envelope.

Q: Are there regulatory or compliance differences between these parts?

A: The SMF10A-E3-08 is ROHS3 compliant, while the SMF10AT1 is RoHS non-compliant. Both parts are EAR99 classified and REACH Unaffected. For applications requiring RoHS compliance, the Vishay substitute is the appropriate choice.