SMF51A-T13 Equivalent & Substitute Parts

Part Overview

The SMF51A-T13 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This surface-mount component operates in the 51V reverse standoff voltage range with an 82.4V maximum clamping voltage and 2.4A peak pulse current capability. The part is currently in active production status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring identical electrical and mechanical performance characteristics.

Substiute Parts

SMF51A-T13

Littelfuse Inc.In Stock: 823SMF51A-T13 Datasheet

Current PartRFQ

SMF51A

MeritekIn Stock: 15621SMF51A Datasheet

DirectRFQ

SMF51A-TP

Micro Commercial CoIn Stock: 11674SMF51A-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMF51A-T13 are qualified based on strict electrical and mechanical parameter matching within the allowed tolerances for TVS diode applications. The substitution criteria are:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 51V
• Voltage - Breakdown (Min): 56.7V
• Voltage - Clamping (Max) @ Ipp: 82.4V
• Current - Peak Pulse (10/1000µs): 2.4A ± tolerance
• Power - Peak Pulse: 200W
• Package / Case: SOD-123F
• Mounting Type: Surface Mount
• Type: Zener, Unidirectional (1 channel)
• RoHS Status: ROHS3 Compliant
• MSL Rating: 1 (Unlimited)

Parts meeting these criteria across all manufacturers are considered direct substitutes. Minor variations in peak pulse current (within 1.25% tolerance) and operating temperature range extensions are acceptable provided all other parameters remain identical.

Parameter Comparison

Engineering Selection Recommendations

All three parts—SMF51A-T13 (Littelfuse Inc.), SMF51A (Meritek), and SMF51A-TP (Micro Commercial Co)—are qualified substitutes based on matching electrical specifications and compliance certifications. Selection among these parts should be based on:

Product Status: All parts are in active production status, ensuring ongoing availability and supply chain support.

Compliance: All parts meet ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for industrial and commercial applications.

Packaging Notation: The SMF51A (Meritek) is designated SOD-123FL, while SMF51A-T13 and SMF51A-TP are designated SOD-123F. Both designations refer to the same physical package footprint suitable for surface-mount assembly.

Operating Temperature: The SMF51A-TP (Micro Commercial Co) offers an extended operating temperature range of -65 to 175°C (TA) compared to the standard -55 to 150°C range of the other two parts. This extended range may be advantageous for applications in extreme thermal environments.

Peak Pulse Current: The SMF51A (Meritek) specifies 2.43A peak pulse current, which is within acceptable tolerance of the 2.4A specification. This minor variation does not affect functional equivalence for general-purpose TVS applications.

Frequently Asked Questions (FAQ)

Q: Can SMF51A (Meritek) be used as a direct replacement for SMF51A-T13 (Littelfuse)?

A: Yes. Both parts share identical voltage ratings (51V reverse standoff, 82.4V clamping), power dissipation (200W peak pulse), and package type (SOD-123F/SOD-123FL). The 2.43A peak pulse current specification of the Meritek part is within acceptable tolerance of the 2.4A specification.

Q: What is the difference between SOD-123F and SOD-123FL package designations?

A: Both designations refer to the same physical surface-mount package footprint. The "FL" suffix in SOD-123FL is a supplier-specific notation and does not indicate a different package size or pin configuration. Parts are mechanically and electrically interchangeable.

Q: Is the SMF51A-TP suitable for high-temperature applications?

A: The SMF51A-TP (Micro Commercial Co) supports an operating temperature range of -65 to 175°C (TA), which extends beyond the standard -55 to 150°C range. This part is suitable for applications requiring operation in elevated or extreme thermal environments, provided all other electrical specifications remain within design requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All three parts—SMF51A-T13, SMF51A, and SMF51A-TP—are RoHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating, meeting regulatory requirements for lead-free and hazardous substance restrictions.

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. All parts use the SOD-123F surface-mount package with identical footprints, allowing direct substitution during PCB assembly without design modifications or layout changes.