SMFE11ALH Equivalent & Substitute Parts

Part Overview

The SMFE11ALH is an active Transient Voltage Suppressor (TVS) diode manufactured by Eaton - Electronics Division. This unidirectional zener diode is designed for transient overvoltage protection in surface mount applications, featuring an 11V reverse standoff voltage and 22A peak pulse current capability. The device is packaged in SOD-123F format and qualifies for automotive applications under AEC-Q101 certification.

Equivalent and substitute parts are identified to provide design flexibility, support supply chain continuity, and accommodate specific application requirements such as extended temperature ranges, alternative package geometries, or inventory availability.

Substiute Parts

SMFE11ALH

Eaton - Electronics DivisionIn Stock: 932SMFE11ALH Datasheet

Current PartRFQ

VTVS11ASMF-HM3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 30677VTVS11ASMF-HM3-08 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMFE11ALH are identified based on electrical and mechanical compatibility within the Transient Voltage Suppressor category. The substitution logic is governed by the following critical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 11V nominal (tolerance range 11V to 11.2V acceptable)
• Voltage - Clamping (Max) @ Ipp: 18V to 18.2V range
• Current - Peak Pulse (10/1000µs): 21.13A to 22A range
• Power - Peak Pulse: 400W minimum
• Type: Zener, Unidirectional (1 channel)

Mechanical & Compliance Criteria:

• Mounting Type: Surface Mount
• Grade: Automotive
• Qualification: AEC-Q101
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)
• Product Status: Active

Package Consideration: Substitute parts may utilize alternative surface mount package geometries (SOD-123F, DO-219AB) provided electrical performance remains within specified tolerances.

Parameter Comparison

Engineering Selection Recommendations

SMFE11ALH (Eaton - Electronics Division)

Primary selection for applications requiring SOD-123F package geometry. Active product status with full automotive qualification (AEC-Q101) and ROHS3 compliance. Operating temperature range of -55°C to 150°C supports standard automotive thermal environments. Unidirectional zener configuration with 11V standoff voltage and 22A peak pulse current provides specified transient suppression performance.

VTVS11ASMF-HM3-08 (Vishay General Semiconductor - Diodes Division)

Functionally equivalent substitute utilizing DO-219AB (SMF) package geometry. Maintains identical electrical performance within specified tolerances: 11.2V standoff voltage, 18V clamping voltage, and 21.13A peak pulse current. Extended operating temperature range (-55°C to 175°C) accommodates high-temperature automotive applications. Active product status with AEC-Q101 qualification and ROHS3 compliance. Package geometry difference (DO-219AB versus SOD-123F) requires PCB layout verification for mechanical fit and thermal management compatibility.

Both parts satisfy automotive-grade requirements, regulatory compliance, and electrical performance specifications for transient voltage suppression applications.

Frequently Asked Questions (FAQ)

Q: What determines if a TVS diode can substitute for the SMFE11ALH?

A: Substitution is valid when the alternative part maintains the following parameters within specified tolerances: Voltage - Reverse Standoff (Typ) of 11V nominal, Voltage - Clamping (Max) @ Ipp between 18V and 18.2V, Current - Peak Pulse (10/1000µs) of 21.13A to 22A, and Power - Peak Pulse of 400W. The part must be unidirectional zener type, surface mount, automotive grade with AEC-Q101 qualification, ROHS3 compliant, and MSL 1 rated.

Q: Can I use VTVS11ASMF-HM3-08 as a direct replacement for SMFE11ALH?

A: Electrical substitution is valid. Both parts meet the core performance criteria for transient voltage suppression. However, the package geometry differs: SMFE11ALH uses SOD-123F while VTVS11ASMF-HM3-08 uses DO-219AB (SMF). PCB layout and footprint compatibility must be verified before implementation.

Q: What is the significance of the operating temperature range difference?

A: SMFE11ALH operates from -55°C to 150°C (TJ), while VTVS11ASMF-HM3-08 operates from -55°C to 175°C (TJ). The extended upper temperature limit of the Vishay part provides additional thermal margin for high-temperature automotive environments. Selection depends on the specific thermal requirements of the application.

Q: Are both parts automotive qualified?

A: Yes. Both SMFE11ALH and VTVS11ASMF-HM3-08 carry automotive grade designation and AEC-Q101 qualification, confirming suitability for automotive transient voltage suppression applications.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 (Unlimited) indicates the component has no moisture sensitivity limitations. Both parts can be stored and handled without moisture-related constraints, simplifying supply chain management and assembly processes.

Q: How do the clamping voltage specifications compare?

A: SMFE11ALH specifies 18.2V maximum clamping voltage at peak pulse current, while VTVS11ASMF-HM3-08 specifies 18V. Both values fall within acceptable transient suppression performance for 11V standoff voltage applications. The 0.2V difference is within typical component tolerance ranges.