SMFE22AH Equivalent & Substitute Parts

Part Overview

The SMFE22AH is an automotive-grade transient voltage suppressor (TVS) diode manufactured by Eaton Electronics Division. This unidirectional zener diode is designed for telecom applications requiring transient overvoltage protection. The device features a 22V reverse standoff voltage with a 35.5V maximum clamping voltage and 5.6A peak pulse current capability in a surface mount SOD-123FL package. The part maintains active product status with full AEC-Q101 automotive qualification and ROHS3 compliance.

Substitute parts are identified when equivalent electrical performance parameters and mechanical compatibility are maintained across alternative manufacturers while preserving automotive-grade certification and qualification standards.

Substiute Parts

SMFE22AH

Eaton - Electronics DivisionIn Stock: 4203SMFE22AH Datasheet

Current PartRFQ

SMF22A-HE3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 20441SMF22A-HE3-08 Datasheet

SimilarRFQ

SZSMF22AT1G

Littelfuse Inc.In Stock: 4085SZSMF22AT1G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMFE22AH is determined by strict equivalence across the following critical parameters:

Electrical Performance Criteria:

• Voltage - Reverse Standoff (Typ): 22V
• Voltage - Breakdown (Min): 24.4V
• Voltage - Clamping (Max) @ Ipp: 35.5V
• Current - Peak Pulse (10/1000µs): 5.6A
• Power - Peak Pulse: 200W
• Type: Unidirectional Zener

Mechanical & Environmental Criteria:

• Mounting Type: Surface Mount
• Grade: Automotive
• Qualification: AEC-Q101
• RoHS Status: ROHS3 Compliant
• MSL Rating: 1 (Unlimited)

Package Compatibility: Substitutes must maintain surface mount compatibility. The SMFE22AH uses SOD-123FL packaging. Substitute parts may use equivalent surface mount packages (SOD-123F, DO-219AB) provided they are mechanically compatible with the application's PCB layout and assembly process.

Parameter Comparison

Engineering Selection Recommendations

SMF22A-HE3-08 (Vishay General Semiconductor - Diodes Division)

This substitute maintains full electrical equivalence with the SMFE22AH across all critical transient suppression parameters. The part carries identical automotive-grade certification (AEC-Q101) and ROHS3 compliance. The extended operating temperature range (-65 to 175°C) provides additional thermal margin compared to the original part. The primary consideration is package compatibility: the SMF22A-HE3-08 uses DO-219AB (SMF) packaging rather than SOD-123FL. PCB layout and assembly process compatibility must be verified for this package variant.

SZSMF22AT1G (Littelfuse Inc.)

This substitute provides direct electrical and package equivalence to the SMFE22AH. Both devices use SOD-123F surface mount packaging, eliminating package compatibility concerns. The part maintains identical automotive-grade certification (AEC-Q101) and ROHS3 compliance. Operating temperature range matches the original specification (-55 to 150°C). This substitute offers the most direct replacement path with minimal design modification requirements.

Both substitute parts are active products with full automotive qualification and regulatory compliance. Selection between substitutes depends on package compatibility requirements and thermal operating envelope specifications for the target application.

Frequently Asked Questions (FAQ)

Q: What determines if a TVS diode can substitute for the SMFE22AH?

A: Substitution requires exact equivalence across electrical performance parameters: 22V reverse standoff voltage, 24.4V minimum breakdown voltage, 35.5V maximum clamping voltage, and 5.6A peak pulse current. The part must maintain automotive-grade certification (AEC-Q101), ROHS3 compliance, and surface mount mounting type. Unidirectional zener topology and 200W peak pulse power rating must be preserved.

Q: Are there package differences between the SMFE22AH and its substitutes?

A: The SMFE22AH uses SOD-123FL packaging. The SZSMF22AT1G substitute uses SOD-123F packaging, which is mechanically compatible. The SMF22A-HE3-08 substitute uses DO-219AB (SMF) packaging, which differs mechanically. Package selection depends on PCB layout constraints and assembly process compatibility. Verify footprint compatibility with your specific application before implementation.

Q: Do all substitute parts meet automotive qualification requirements?

A: Yes. Both identified substitutes (SMF22A-HE3-08 and SZSMF22AT1G) carry AEC-Q101 automotive qualification and ROHS3 compliance, matching the original SMFE22AH specification. All three parts are classified as automotive-grade components suitable for automotive applications.

Q: What is the operating temperature difference between substitutes?

A: The SMFE22AH and SZSMF22AT1G operate across -55 to 150°C (TJ). The SMF22A-HE3-08 extends this range to -65 to 175°C (TJ), providing additional thermal margin. For applications operating within the -55 to 150°C range, both substitutes perform identically. Applications requiring extended temperature operation benefit from the SMF22A-HE3-08 specification.

Q: Can I use these substitutes interchangeably in my design?

A: Electrical interchangeability is confirmed for both substitutes. However, package differences require verification. The SZSMF22AT1G offers direct package compatibility with the SMFE22AH (SOD-123F). The SMF22A-HE3-08 requires PCB layout and assembly process evaluation due to DO-219AB packaging. Confirm mechanical fit and thermal management compatibility before production implementation.

Q: Are moisture sensitivity levels equivalent across all three parts?

A: Yes. The SMFE22AH, SMF22A-HE3-08, and SZSMF22AT1G all carry MSL Rating 1 (Unlimited), indicating no moisture sensitivity restrictions. Storage and handling requirements are identical across all three parts.