SMFE20AH Equivalent & Substitute Parts

Part Overview

The SMFE20AH 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 in surface mount configurations. The device features a 20V reverse standoff voltage with 32.4V maximum clamping voltage and 6.2A peak pulse current capability. The SMFE20AH maintains active product status with 887 units currently in stock. Equivalent substitute parts are identified to support procurement flexibility, design redundancy, and supply chain continuity when the primary part becomes unavailable or when alternative sourcing is required.

Substiute Parts

SMFE20AH

Eaton - Electronics DivisionIn Stock: 987SMFE20AH Datasheet

Current PartRFQ

SZSMF20AT1G

Littelfuse Inc.In Stock: 2939SZSMF20AT1G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMFE20AH is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part SZSMF20AT1G from Littelfuse Inc. qualifies as a direct equivalent based on the following matching criteria:

Electrical Parameters (Identical):

• Voltage - Reverse Standoff (Typ): 20V
• Voltage - Breakdown (Min): 22.2V
• Voltage - Clamping (Max) @ Ipp: 32.4V
• Current - Peak Pulse (10/1000µs): 6.2A
• Power - Peak Pulse: 200W
• Operating Temperature Range: -55°C to 150°C (TJ)

Mechanical Parameters (Identical):

• Package / Case: SOD-123F
• Mounting Type: Surface Mount
• Unidirectional Channels: 1
• Type: Zener

Compliance & Certification (Identical):

• Grade: Automotive
• Qualification: AEC-Q101
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected

Both parts are classified as Transient Voltage Suppressors (TVS) with active product status and identical packaging specifications (SOD-123FL/SOD-123F).

Parameter Comparison

Engineering Selection Recommendations

The SZSMF20AT1G from Littelfuse Inc. is a direct functional and mechanical equivalent to the SMFE20AH. Both devices are automotive-grade components qualified to AEC-Q101 standards, ensuring compliance with automotive reliability and quality requirements. Both parts maintain active product status, indicating ongoing manufacturer support and availability.

Selection between these two parts is based on procurement availability, supplier relationships, and inventory status. The SMFE20AH currently has 887 units in stock, while the SZSMF20AT1G has 2,864 units available. Both parts are RoHS3 compliant and REACH unaffected, meeting environmental regulatory requirements. The identical electrical performance, temperature operating range, and package specifications ensure interchangeable performance in transient voltage suppression applications.

No design modifications, circuit adjustments, or additional validation are required when substituting between these parts, as all critical parameters are identical.

Frequently Asked Questions (FAQ)

Q: Can the SZSMF20AT1G replace the SMFE20AH in existing designs?

A: Yes. The SZSMF20AT1G is a direct equivalent with identical electrical ratings (20V standoff, 32.4V clamping, 6.2A peak pulse), identical package (SOD-123F), and identical automotive qualification (AEC-Q101). No circuit modifications are required.

Q: Are there any differences in operating temperature ranges between these parts?

A: No. Both the SMFE20AH and SZSMF20AT1G operate across the identical temperature range of -55°C to 150°C (TJ).

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are RoHS3 compliant, REACH unaffected, and qualified to AEC-Q101 automotive standards. Both maintain MSL 1 (Unlimited) moisture sensitivity levels.

Q: What is the difference in packaging between SOD-123FL and SOD-123F?

A: The SMFE20AH is supplied in SOD-123FL (Tape & Reel with lead-free designation), while the SZSMF20AT1G is supplied in SOD-123F (Tape & Reel). Both designations refer to the same physical package footprint and are mechanically and electrically compatible for surface mount assembly.

Q: Are both parts suitable for telecom applications?

A: The SMFE20AH is specified for telecom applications. The SZSMF20AT1G carries identical electrical specifications and automotive-grade qualification, making it suitable for the same transient voltage suppression requirements in telecom and other applications requiring 20V standoff protection.

Q: What is the peak pulse power rating for both parts?

A: Both the SMFE20AH and SZSMF20AT1G are rated for 200W peak pulse power with a 10/1000µs pulse profile.

Q: Can these parts be used interchangeably in production?

A: Yes. The identical electrical parameters, package specifications, and automotive qualifications allow these parts to be used interchangeably without design changes or additional testing.