SMFE30AH Equivalent & Substitute Parts

Part Overview

The SMFE30AH is an automotive-grade transient voltage suppressor (TVS) diode manufactured by Eaton Electronics Division. This unidirectional Zener diode is designed for transient overvoltage protection in telecom applications, featuring a 30V reverse standoff voltage and 48.4V maximum clamping voltage at peak pulse current. The device is packaged in SOD-123FL surface mount configuration and maintains active product status with full AEC-Q101 automotive qualification.

Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and component availability across manufacturing environments where the primary part may be unavailable or where alternative package configurations are required.

Substiute Parts

SMFE30AH

Eaton - Electronics DivisionIn Stock: 3750SMFE30AH Datasheet

Current PartRFQ

SMF30A-HE3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 65272SMF30A-HE3-08 Datasheet

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SZSMF30AT1G

Littelfuse Inc.In Stock: 7983SZSMF30AT1G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMFE30AH are qualified based on electrical parameter equivalence and automotive compliance certification. All identified substitutes maintain identical electrical performance specifications:

Critical Matching Parameters:

• Voltage - Reverse Standoff: 30V (Typ)
• Voltage - Clamping (Max) @ Ipp: 48.4V
• Current - Peak Pulse (10/1000µs): 4.1A
• Power - Peak Pulse: 200W
• Unidirectional Channels: 1
• Type: Zener
• Grade: Automotive
• Qualification: AEC-Q101
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Substitutes are differentiated by package configuration (SOD-123F versus DO-219AB) and manufacturer series designation. All substitutes are active products with confirmed inventory availability and maintain identical electrical performance within specified operating conditions.

Parameter Comparison

Engineering Selection Recommendations

All three TVS diode options—SMFE30AH, SMF30A-HE3-08, and SZSMF30AT1G—are qualified substitutes based on electrical parameter equivalence and automotive compliance certification. Selection between these parts is determined by package availability and PCB layout requirements rather than electrical performance differences.

SMFE30AH (Eaton): Primary part with SOD-123F package configuration. Suitable for designs requiring compact surface mount footprint with standard lead spacing. Operating temperature range -55°C to 150°C.

SMF30A-HE3-08 (Vishay): Functionally equivalent substitute with DO-219AB package configuration. Provides extended operating temperature range (-65°C to 175°C) for applications requiring enhanced thermal performance. Capacitance specification of 207pF @ 1MHz is provided. Higher inventory availability (65,200 pcs) supports supply chain continuity.

SZSMF30AT1G (Littelfuse): Direct package equivalent to SMFE30AH with SOD-123F configuration. Maintains identical operating temperature range (-55°C to 150°C). Suitable for direct footprint replacement in existing designs.

All parts maintain AEC-Q101 automotive qualification, ROHS3 compliance, and MSL 1 (Unlimited) moisture sensitivity rating. Selection between SOD-123F and DO-219AB packages is determined by PCB design constraints and available board space.

Frequently Asked Questions (FAQ)

Q: Can SMF30A-HE3-08 (DO-219AB package) be used as a direct replacement for SMFE30AH (SOD-123F package)?

A: SMF30A-HE3-08 is electrically equivalent but uses a different package footprint (DO-219AB versus SOD-123F). Direct PCB substitution is not possible without layout modification. However, the electrical performance is identical, and the part is qualified for the same applications. PCB redesign or adapter solutions are required for physical integration.

Q: Are all three parts suitable for automotive applications?

A: Yes. All three parts carry automotive grade designation and AEC-Q101 qualification. They are approved for use in automotive transient voltage suppression circuits.

Q: What is the difference in operating temperature range between SMFE30AH and SMF30A-HE3-08?

A: SMFE30AH operates from -55°C to 150°C (TJ). SMF30A-HE3-08 operates from -65°C to 175°C (TJ), providing a 10°C lower minimum and 25°C higher maximum operating temperature. For applications within the -55°C to 150°C range, both parts perform identically.

Q: Do all substitute parts have the same moisture sensitivity level?

A: Yes. SMFE30AH, SMF30A-HE3-08, and SZSMF30AT1G all have MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage and handling.

Q: Which substitute part offers the best supply chain availability?

A: SMF30A-HE3-08 (Vishay) has the highest inventory level at 65,200 pcs. SZSMF30AT1G (Littelfuse) has 7,950 pcs available. SMFE30AH (Eaton) has 3,705 pcs in stock.

Q: Are all parts RoHS compliant?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements for electronic component manufacturing and distribution.

Q: What is the significance of the 207pF capacitance specification for SMF30A-HE3-08?

A: The 207pF @ 1MHz capacitance specification is provided for SMF30A-HE3-08 only. This parameter is relevant for high-frequency circuit analysis and EMI filtering applications. For standard transient suppression applications, this specification does not affect substitution compatibility.