SMF14AT1G Equivalent & Substitute Parts

Part Overview

The SMF14AT1G is a 14V Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 23.2V maximum clamping voltage and 8.6A peak pulse current capability in a SOD-123FL package. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

SMF14AT1G

Littelfuse Inc.In Stock: 10256SMF14AT1G Datasheet

Current PartRFQ

SMF14A

MeritekIn Stock: 19215SMF14A Datasheet

DirectRFQ

SMF14A-T13

Littelfuse Inc.In Stock: 19853SMF14A-T13 Datasheet

DirectRFQ

SMF14A-E3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 35351SMF14A-E3-08 Datasheet

DirectRFQ

SMF14A-TP

Micro Commercial CoIn Stock: 59972SMF14A-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMF14AT1G is determined by the following critical parameters:

• Voltage - Reverse Standoff: 14V (exact match required)
• Voltage - Breakdown (Min): 15.6V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 23.2V ± 0.1V tolerance acceptable
• Current - Peak Pulse (10/1000µs): 8.6A ± 0.02A tolerance acceptable
• Power - Peak Pulse: 200W (exact match required)
• Type: Zener, Unidirectional (exact match required)
• Mounting Type: Surface Mount (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)

Package variations (SOD-123FL vs. DO-219AB) are permitted when mechanical and thermal characteristics remain compatible with the original application footprint. All substitute parts must maintain identical electrical performance within specified tolerances and comply with ROHS3 and REACH requirements.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts (SMF14A, SMF14A-T13, SMF14A-E3-08, and SMF14A-TP) meet the electrical and compliance requirements for direct substitution of the obsolete SMF14AT1G.

SMF14A (Meritek): Active product status with identical electrical specifications. Clamping voltage of 23.3V is within acceptable tolerance. Suitable for applications requiring standard operating temperature range (-55°C ~ 150°C).

SMF14A-T13 (Littelfuse Inc.): Active product from the original manufacturer with identical electrical performance and packaging. Tape & Reel packaging format. Recommended for designs requiring manufacturer continuity and established supply chain relationships.

SMF14A-E3-08 (Vishay General Semiconductor): Active product with extended operating temperature range (-65°C ~ 175°C). DO-219AB package requires PCB footprint verification. Suitable for applications with elevated thermal requirements or wider temperature operating conditions.

SMF14A-TP (Micro Commercial Co): Active product with extended operating temperature range (-65°C ~ 175°C). SOD-123FL package maintains original footprint compatibility. Highest inventory availability among substitutes.

All substitutes carry ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can SMF14A-E3-08 (DO-219AB package) be used as a direct PCB replacement for SMF14AT1G (SOD-123F package)?

A: Electrical performance is equivalent, but the DO-219AB package has different physical dimensions and footprint compared to SOD-123F. PCB layout verification is required to confirm mechanical compatibility with the original design.

Q: What is the significance of the clamping voltage difference between SMF14AT1G (23.2V) and SMF14A (23.3V)?

A: The 0.1V difference falls within normal manufacturing tolerance for TVS diodes and does not affect circuit protection performance. Both values meet the specified maximum clamping voltage requirement.

Q: Are all substitute parts suitable for high-temperature applications?

A: SMF14A and SMF14A-T13 are rated to -55°C ~ 150°C. SMF14A-E3-08 and SMF14A-TP extend to -65°C ~ 175°C, providing wider temperature margin for demanding thermal environments.

Q: Why is SMF14AT1G listed as obsolete?

A: Obsolescence typically reflects manufacturer discontinuation decisions. Active substitutes with identical or superior specifications are available from multiple manufacturers, ensuring design continuity.

Q: Do all substitutes maintain the same MSL rating?

A: Yes, all substitute parts carry MSL 1 (Unlimited) rating, matching the original part's moisture sensitivity classification.

Q: What packaging formats are available among the substitutes?

A: SMF14A, SMF14A-T13, and SMF14A-TP use SOD-123F/SOD-123FL packages. SMF14A-E3-08 uses DO-219AB package. Verify PCB footprint compatibility before selection.