SMFE22ALH Equivalent & Substitute Parts

Part Overview

The SMFE22ALH 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 a 22V reverse standoff voltage and 35.5V maximum clamping voltage. 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, supply chain alternatives, and component availability options while maintaining electrical and mechanical compatibility within specified parameter ranges.

Substiute Parts

SMFE22ALH

Eaton - Electronics DivisionIn Stock: 943SMFE22ALH Datasheet

Current PartRFQ

VTVS23ASMF-HM3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 33343VTVS23ASMF-HM3-08 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMFE22ALH is determined by electrical parameter compatibility within the following criteria:

Voltage Parameters: The reverse standoff voltage must fall within the range of 22V to 22.6V (±2.7% tolerance). The breakdown voltage minimum must be between 24.4V and 25.7V. The clamping voltage maximum must not exceed 38V to ensure transient suppression effectiveness.

Current Parameters: Peak pulse current must be within 10.09A to 11.3A, maintaining adequate surge handling capability.

Power Dissipation: Peak pulse power rating must equal or exceed 400W.

Environmental and Compliance: Operating temperature range must encompass -55°C to 150°C minimum. Automotive grade classification and AEC-Q101 qualification are required. RoHS3 compliance and MSL 1 rating must be maintained.

Mechanical Compatibility: Surface mount packaging with SOD-123F or equivalent footprint compatibility (DO-219AB) is acceptable.

The VTVS23ASMF-HM3-08 meets all substitution criteria within these parameter boundaries.

Parameter Comparison

Engineering Selection Recommendations

Both the SMFE22ALH and VTVS23ASMF-HM3-08 are active, automotive-grade TVS diodes with AEC-Q101 qualification and ROHS3 compliance. Selection between these parts is based on the following factors:

Electrical Performance: The VTVS23ASMF-HM3-08 exhibits a slightly higher clamping voltage (38V versus 35.5V) and lower peak pulse current (10.09A versus 11.3A). These differences remain within acceptable substitution parameters for transient suppression applications.

Temperature Rating: The VTVS23ASMF-HM3-08 supports an extended upper operating temperature of 175°C compared to 150°C for the SMFE22ALH. This provides additional thermal margin in high-temperature environments.

Package Compatibility: The SMFE22ALH uses SOD-123F packaging, while the VTVS23ASMF-HM3-08 uses DO-219AB (SMF) packaging. Both are surface mount formats with compatible footprints for standard PCB layouts.

Supply Availability: The VTVS23ASMF-HM3-08 maintains significantly higher inventory (33,300 pieces) compared to the SMFE22ALH (874 pieces), providing supply chain advantages.

Both parts satisfy automotive and compliance requirements and are suitable for telecom and general transient protection applications.

Frequently Asked Questions (FAQ)

Q: Can the VTVS23ASMF-HM3-08 directly replace the SMFE22ALH in existing designs?

A: Yes. Both devices meet the same electrical parameter ranges for reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse current. Both are automotive-grade, AEC-Q101 qualified, and ROHS3 compliant. PCB footprint compatibility must be verified, as the SMFE22ALH uses SOD-123F and the VTVS23ASMF-HM3-08 uses DO-219AB (SMF) packaging.

Q: What are the key electrical differences between these two parts?

A: The VTVS23ASMF-HM3-08 has a clamping voltage of 38V (versus 35.5V) and peak pulse current of 10.09A (versus 11.3A). The reverse standoff voltage is 22.6V (versus 22V). These variations remain within acceptable substitution tolerances for transient voltage suppression.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the SMFE22ALH and VTVS23ASMF-HM3-08 carry automotive grade classification and AEC-Q101 qualification, meeting automotive industry standards for reliability and performance.

Q: What is the difference in operating temperature range?

A: The SMFE22ALH operates from -55°C to 150°C, while the VTVS23ASMF-HM3-08 operates from -55°C to 175°C. The VTVS23ASMF-HM3-08 provides a 25°C higher upper temperature limit, beneficial for high-temperature applications.

Q: Do both parts have the same moisture sensitivity rating?

A: Yes. Both devices have MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage or handling.

Q: What packaging considerations apply to substitution?

A: The SMFE22ALH is packaged in SOD-123F, while the VTVS23ASMF-HM3-08 is packaged in DO-219AB (SMF). Both are surface mount packages with compatible footprints. PCB layout and land pattern verification is required before implementation.

Q: Are both parts RoHS compliant?

A: Yes. Both the SMFE22ALH and VTVS23ASMF-HM3-08 are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements.