SMFE24AH Equivalent & Substitute Parts

Part Overview

The SMFE24AH is an automotive-grade transient voltage suppressor (TVS) diode manufactured by Eaton Electronics Division. This unidirectional Zener diode is designed for telecom applications, featuring a 24V reverse standoff voltage and 38.9V maximum clamping voltage at peak pulse current. The device is packaged in SOD-123FL surface mount configuration and carries AEC-Q101 automotive qualification. Substitute parts are identified to provide design flexibility when the primary part is unavailable or when alternative package configurations are required for specific manufacturing processes.

Substiute Parts

SMFE24AH

Eaton - Electronics DivisionIn Stock: 1099SMFE24AH Datasheet

Current PartRFQ

SMF24A-HE3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 65130SMF24A-HE3-08 Datasheet

SimilarRFQ

SZSMF24AT1G

Littelfuse Inc.In Stock: 16165SZSMF24AT1G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of TVS diodes is determined by electrical parameter equivalence and mechanical compatibility. The SMFE24AH can be substituted with alternative parts when the following criteria are met:

Critical Electrical Parameters (Must Match):

• Voltage - Reverse Standoff (Typ): 24V
• Voltage - Breakdown (Min): 26.7V
• Voltage - Clamping (Max) @ Ipp: 38.9V
• Current - Peak Pulse (10/1000µs): 5.1A
• Power - Peak Pulse: 200W

Mechanical Compatibility Parameters:

• Mounting Type: Surface Mount
• Unidirectional Channels: 1
• Type: Zener
• Qualification: AEC-Q101

Package Considerations: Substitutes may utilize different surface mount packages (SOD-123F or DO-219AB) provided the physical footprint and lead configuration are compatible with the target PCB design. Package differences require verification of board layout compatibility.

Parameter Comparison

Engineering Selection Recommendations

All three parts—SMFE24AH, SMF24A-HE3-08, and SZSMF24AT1G—are active products with identical electrical specifications and AEC-Q101 automotive qualification. Selection between these parts is based on:

Package Configuration:

• SMFE24AH and SZSMF24AT1G utilize SOD-123F packaging, suitable for designs with SOD-123F footprints
• SMF24A-HE3-08 utilizes DO-219AB packaging, required for designs with DO-219AB footprints

Operating Temperature Range:

• SMF24A-HE3-08 supports -65 to 175°C, providing extended low-temperature and high-temperature operation
• SMFE24AH and SZSMF24AT1G support -55 to 150°C, suitable for standard automotive temperature ranges

Compliance Status:

• All parts are ROHS3 compliant (where specified) and REACH unaffected
• All parts carry identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications

Inventory Availability:

• SMF24A-HE3-08: 65,100 pcs
• SZSMF24AT1G: 16,062 pcs
• SMFE24AH: 1,031 pcs

Frequently Asked Questions (FAQ)

Q: Can SMFE24AH be directly replaced with SMF24A-HE3-08?

A: Direct replacement requires PCB footprint compatibility. SMFE24AH uses SOD-123F packaging while SMF24A-HE3-08 uses DO-219AB packaging. These packages have different physical dimensions and lead configurations. Substitution is possible only if the target PCB design accommodates DO-219AB footprints.

Q: Are all three parts suitable for automotive applications?

A: Yes. All three parts carry AEC-Q101 automotive qualification and are rated for automotive-grade operation. Selection depends on specific package requirements and operating temperature specifications of the application.

Q: What is the difference between SOD-123F and DO-219AB packages?

A: SOD-123F and DO-219AB are distinct surface mount package types with different physical footprints and lead configurations. PCB design determines which package is compatible. Consult PCB layout specifications to confirm package compatibility before substitution.

Q: Do all substitute parts have identical electrical performance?

A: Yes. All three parts share identical electrical specifications: 24V reverse standoff voltage, 26.7V minimum breakdown voltage, 38.9V maximum clamping voltage, 5.1A peak pulse current, and 200W peak pulse power. Electrical performance is equivalent across all three parts.

Q: Which substitute part has the widest operating temperature range?

A: SMF24A-HE3-08 supports -65 to 175°C operating temperature range, compared to -55 to 150°C for SMFE24AH and SZSMF24AT1G. Selection of SMF24A-HE3-08 is required for applications requiring extended temperature operation beyond -55°C or above 150°C.

Q: Are moisture sensitivity levels identical across all parts?

A: Yes. All three parts carry MSL 1 (Unlimited) moisture sensitivity level, indicating no moisture sensitivity restrictions for storage and handling.

Q: Can package selection affect circuit performance?

A: Package selection does not affect electrical performance. However, package choice impacts PCB layout, assembly process compatibility, and physical board space. Select the package that matches your PCB design specifications.