SMFE64ALH Equivalent & Substitute Parts

Part Overview

The SMFE64ALH is an active Transient Voltage Suppressor (TVS) diode manufactured by Eaton - Electronics Division. This unidirectional zener-type device is designed for transient overvoltage protection in surface mount applications, with a 64V reverse standoff voltage and 103V maximum clamping voltage. The component is qualified to AEC-Q101 automotive standards and operates across the temperature range of -55°C to 150°C. Identification of equivalent and substitute parts is necessary to address supply chain continuity, inventory optimization, and design flexibility while maintaining electrical and mechanical compatibility within specified parameters.

Substiute Parts

SMFE64ALH

Eaton - Electronics DivisionIn Stock: 1000SMFE64ALH Datasheet

Current PartRFQ

VTVS63ASMF-HM3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 27927VTVS63ASMF-HM3-08 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMFE64ALH is determined by alignment of the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Reverse standoff voltage within the specified range (64V nominal for SMFE64ALH)
• Breakdown voltage minimum not less than 71.1V
• Clamping voltage maximum not exceeding 103V at peak pulse current
• Peak pulse current rating of 3.9A or greater
• Peak pulse power rating of 400W or greater
• Unidirectional channel configuration (single channel)
• Zener diode type classification

Mechanical & Environmental Compatibility Criteria:

• Surface mount mounting type
• Automotive grade qualification
• AEC-Q101 certification
• Operating temperature range encompassing -55°C to 150°C
• Moisture sensitivity level of 1 (Unlimited)

Packaging Consideration:

• Package compatibility is evaluated separately; SOD-123F and DO-219AB (SMF) represent different physical form factors that may require PCB layout modification

The VTVS63ASMF-HM3-08 meets the electrical and environmental criteria for substitution with the exception of package form factor, which differs from the original SOD-123F specification.

Parameter Comparison

Engineering Selection Recommendations

VTVS63ASMF-HM3-08 Substitution Assessment:

The VTVS63ASMF-HM3-08 from Vishay General Semiconductor - Diodes Division qualifies as an electrical substitute for the SMFE64ALH based on the following factors:

1. Voltage Specifications: The reverse standoff voltage of 63V is 1V lower than the SMFE64ALH specification of 64V. The breakdown minimum of 70.8V remains within acceptable tolerance relative to the 71.1V minimum. The clamping voltage of 108V is 5V higher than the SMFE64ALH maximum of 103V, representing a marginal increase in transient suppression performance.

2. Current Rating: The peak pulse current of 3.54A is 0.36A lower than the SMFE64ALH rating of 3.9A. This reduction in current capacity must be evaluated against the specific application requirements.

3. Power Rating: Both devices maintain identical peak pulse power ratings of 400W.

4. Thermal Performance: The VTVS63ASMF-HM3-08 operates across -55°C to 175°C, providing a 25°C extended upper temperature range compared to the SMFE64ALH specification of -55°C to 150°C.

5. Compliance & Certification: Both devices carry AEC-Q101 automotive qualification and maintain REACH Unaffected status with identical ECCN and HTSUS classifications.

6. Package Consideration: The VTVS63ASMF-HM3-08 utilizes DO-219AB (SMF) packaging, which differs from the SOD-123F package of the SMFE64ALH. PCB layout and footprint modifications are required for implementation.

Frequently Asked Questions (FAQ)

Q: Can the VTVS63ASMF-HM3-08 be used as a direct replacement for the SMFE64ALH without PCB modification?

A: No. While the electrical parameters are compatible, the package form factors differ. The SMFE64ALH uses SOD-123F packaging, while the VTVS63ASMF-HM3-08 uses DO-219AB (SMF) packaging. PCB footprint and layout modifications are required.

Q: What is the significance of the 5V difference in clamping voltage between the two devices?

A: The VTVS63ASMF-HM3-08 clamps at 108V maximum compared to the SMFE64ALH at 103V. This 5V difference represents slightly higher transient voltage at the clamping point. The selection between these devices depends on the specific circuit protection requirements and the tolerance of downstream components to transient overvoltage.

Q: Does the lower peak pulse current rating of the VTVS63ASMF-HM3-08 affect substitution suitability?

A: The VTVS63ASMF-HM3-08 provides 3.54A peak pulse current compared to the SMFE64ALH at 3.9A. This 0.36A reduction must be evaluated against the actual transient current levels in the application. If the application generates transient currents exceeding 3.54A, the VTVS63ASMF-HM3-08 may not provide adequate protection.

Q: Are both devices qualified for automotive applications?

A: Yes. Both the SMFE64ALH and VTVS63ASMF-HM3-08 carry automotive grade classification and AEC-Q101 qualification, confirming suitability for automotive transient voltage suppression applications.

Q: What is the moisture sensitivity level for both devices?

A: Both devices maintain Moisture Sensitivity Level (MSL) 1, classified as Unlimited. This indicates no moisture-related storage or handling restrictions for either component.

Q: How do the operating temperature ranges compare?

A: The SMFE64ALH operates from -55°C to 150°C (TJ), while the VTVS63ASMF-HM3-08 operates from -55°C to 175°C (TJ). The Vishay device provides a 25°C extended upper temperature capability, which may be advantageous in high-temperature applications.

Q: Are there any regulatory or compliance differences between the two devices?

A: No. Both devices maintain identical REACH Unaffected status, ECCN classification (EAR99), and HTSUS codes (8541.10.0080), indicating equivalent regulatory and compliance standing.