SMF9.0AT1 Equivalent & Substitute Parts

Part Overview

The SMF9.0AT1 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. It features a 9V reverse standoff voltage with a 15.4V maximum clamping voltage and 13A peak pulse current capability in a surface-mount SOD-123F package. The device is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and component procurement.

Substiute Parts

SMF9.0AT1

onsemiIn Stock: 922SMF9.0AT1 Datasheet

Current PartRFQ

SMF9V0A-E3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 17365SMF9V0A-E3-08 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete SMF9.0AT1 is determined by strict equivalence across the following critical electrical parameters:

• Voltage - Reverse Standoff: 9V (nominal)
• Voltage - Breakdown (Min): 10V
• Voltage - Clamping (Max) @ Ipp: 15.4V
• Current - Peak Pulse (10/1000µs): ≥13A
• Power - Peak Pulse: 200W
• Unidirectional Channels: 1
• Type: Zener
• Mounting Type: Surface Mount

The substitute part SMF9V0A-E3-08 meets all critical electrical specifications. While package geometry differs (DO-219AB vs. SOD-123F), both are surface-mount packages suitable for PCB integration. The substitute provides enhanced peak pulse current (14.6A vs. 13A) and extended operating temperature range (-65°C ~ 175°C vs. -55°C ~ 150°C), offering improved performance margins.

Parameter Comparison

Engineering Selection Recommendations

The SMF9V0A-E3-08 (Vishay) is the qualified substitute for the obsolete SMF9.0AT1 (onsemi). Selection is based on the following factors:

• All critical electrical parameters match or exceed the original specification
• Active product status ensures long-term availability and supply chain stability
• ROHS3 compliance provides regulatory advantage over the non-compliant original part
• Extended operating temperature range (-65°C ~ 175°C) accommodates broader environmental conditions
• Higher peak pulse current (14.6A) provides additional design margin
• Both devices maintain identical voltage protection characteristics (9V standoff, 15.4V clamp)

PCB layout modifications may be required due to package geometry differences between SOD-123F and DO-219AB (SMF). Footprint verification is necessary before design release.

Frequently Asked Questions (FAQ)

Q: Can SMF9V0A-E3-08 directly replace SMF9.0AT1 without circuit modification?

A: Electrical substitution is direct. The clamping voltage, breakdown voltage, and peak pulse current are identical. However, the package geometry differs (DO-219AB vs. SOD-123F), requiring PCB footprint verification and potential layout adjustment.

Q: What is the significance of the higher peak pulse current (14.6A vs. 13A) in the substitute?

A: The substitute provides 3.8% additional current capacity, offering improved design margin for transient suppression. This does not require circuit changes but enhances protection reliability.

Q: Why is RoHS compliance important for this substitution?

A: The original SMF9.0AT1 is RoHS non-compliant, while SMF9V0A-E3-08 is ROHS3 compliant. For new designs or products subject to RoHS regulations, the substitute ensures regulatory compliance.

Q: Are there package compatibility concerns?

A: Yes. SOD-123F and DO-219AB (SMF) have different physical dimensions and lead configurations. PCB footprint redesign is required. Both are surface-mount packages suitable for automated assembly.

Q: Does the extended operating temperature range affect circuit performance?

A: The substitute operates from -65°C to 175°C versus -55°C to 150°C for the original. This extended range does not degrade performance within the original specification limits and provides additional thermal margin for demanding applications.

Q: Is the substitute available in the same packaging format (Tape & Reel)?

A: Yes. SMF9V0A-E3-08 is supplied in Tape & Reel (TR) format, compatible with standard pick-and-place assembly equipment.