SMF20AT1G Equivalent & Substitute Parts

Part Overview

The SMF20AT1G is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 20V reverse standoff voltage with a 32.4V maximum clamping voltage and 6.2A peak pulse current capability in a surface-mount SOD-123FL package. The part is currently listed as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued circuit design and production support.

Substiute Parts

SMF20AT1G

Littelfuse Inc.In Stock: 10467SMF20AT1G Datasheet

Current PartRFQ

SMF20A

MDDIn Stock: 91902SMF20A Datasheet

DirectRFQ

SMF20A-TP

Micro Commercial CoIn Stock: 961SMF20A-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMF20AT1G is determined by strict equivalence across the following critical parameters: reverse standoff voltage (20V), breakdown voltage minimum (22.2V), clamping voltage maximum (32.4V), peak pulse current (6.2A), peak pulse power (200W), package type (SOD-123F), mounting configuration (surface mount), and device type (unidirectional Zener). All identified substitutes maintain these electrical and mechanical specifications, ensuring direct functional replacement without circuit redesign.

Parameter Comparison

Engineering Selection Recommendations

Both SMF20A (MDD) and SMF20A-TP (Micro Commercial Co) provide direct electrical equivalence to the obsolete SMF20AT1G. The SMF20A maintains identical operating temperature range (-55 to 150°C) and carries ROHS3 compliance with MSL 1 rating, matching the original part's environmental specifications. The SMF20A-TP extends the operating temperature range to -65 to 175°C, providing enhanced thermal performance for applications requiring wider temperature operation. Both substitutes are currently in active production status with confirmed inventory availability. Selection between these alternatives should be based on packaging requirements (tape & reel versus bulk) and temperature range necessity for the specific application.

Frequently Asked Questions (FAQ)

Q: Can SMF20A or SMF20A-TP be used as direct replacements for SMF20AT1G in existing designs?

A: Yes. Both substitutes maintain identical electrical parameters (20V standoff, 32.4V clamping, 6.2A peak pulse current, 200W peak power) and package configuration (SOD-123F surface mount), enabling direct board-level substitution without circuit modification.

Q: What is the difference between SMF20A and SMF20A-TP?

A: The primary differences are manufacturer (MDD versus Micro Commercial Co), packaging format (tape & reel versus bulk), and operating temperature range (SMF20A-TP extends to -65 to 175°C versus -55 to 150°C for SMF20A). Electrical specifications remain identical.

Q: Are there compliance or certification differences between the substitutes?

A: SMF20A carries confirmed ROHS3 compliance and MSL 1 rating. SMF20A-TP compliance certifications are not specified in available data. Both parts carry REACH Unaffected and EAR99 ECCN classifications matching the original part.

Q: Does the extended temperature range of SMF20A-TP affect circuit performance?

A: The extended temperature range (-65 to 175°C) does not alter the electrical performance within the standard operating range. It provides additional operational margin for applications exposed to extreme thermal conditions.

Q: What packaging considerations apply when selecting between these substitutes?

A: SMF20A is supplied in tape & reel format suitable for automated assembly. SMF20A-TP is supplied in bulk packaging. Selection depends on production volume and assembly equipment compatibility.