SMF8.5A Equivalent & Substitute Parts

Part Overview

The SMF8.5A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This surface-mount component operates in the 8.5V reverse standoff voltage range with a peak pulse power rating of 200W. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this product category.

Substiute Parts

SMF8.5A

Littelfuse Inc.In Stock: 17421SMF8.5A Datasheet

Current PartRFQ

SMFE8-5A

Eaton - Electronics DivisionIn Stock: 4074SMFE8-5A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for TVS diodes in this category is determined by the following critical parameters:

• Voltage Rating Alignment: Reverse standoff voltage, breakdown voltage minimum, and clamping voltage must fall within acceptable tolerance bands for the protected circuit
• Current Handling Capacity: Peak pulse current rating must support the transient energy levels of the application
• Power Dissipation: Peak pulse power rating must match or exceed the application requirement
• Package Compatibility: Surface-mount package type (SOD-123F) must be identical for PCB layout compatibility
• Temperature Operating Range: Must encompass the application's thermal environment
• Compliance Status: RoHS and REACH certifications must be maintained

The SMFE8-5A has been identified as a manufacturer-recommended substitute based on matching package type (SOD-123F), identical power rating (200W), compatible temperature range (-55°C to 150°C), and equivalent compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

SMF8.5A (Littelfuse Inc.) is the primary component specification. This part carries Active product status, RoHS3 compliance, and REACH unaffected designation. Current inventory availability is 17,400 pieces.

SMFE8-5A (Eaton - Electronics Division) is listed as the manufacturer-recommended substitute. This part maintains Active product status with RoHS compliance and identical MSL rating. Inventory availability is 3,998 pieces. Selection between these parts should be based on supply chain requirements, lead time considerations, and application-specific voltage protection needs, as the voltage parameters differ significantly between the two devices.

Frequently Asked Questions (FAQ)

Q: Can SMFE8-5A directly replace SMF8.5A in all applications?

A: Package compatibility is confirmed (both SOD-123F). However, voltage parameters differ substantially: SMF8.5A operates at 8.5V reverse standoff with 14.4V clamping, while SMFE8-5A operates at 85V reverse standoff with 137V clamping. Substitution is valid only when the application circuit voltage protection requirement matches the SMFE8-5A specification.

Q: What determines whether a TVS diode can substitute for another?

A: Critical parameters include reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current rating, power dissipation capability, and package type. All must align with application requirements. Compliance certifications (RoHS, REACH) and operating temperature range must also be maintained.

Q: Are there inventory or lead time advantages to using the substitute?

A: SMF8.5A has higher current inventory (17,400 pieces) compared to SMFE8-5A (3,998 pieces). Lead time and availability should be evaluated based on current supply chain conditions and application timeline requirements.

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

A: Yes. Both SMF8.5A and SMFE8-5A carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage or handling.

Q: What is the difference in peak pulse current between these parts?

A: SMF8.5A is rated for 13.9A peak pulse current, while SMFE8-5A is rated for 1.5A peak pulse current. This difference reflects their different voltage protection classes and must be considered for transient energy absorption capability in the target application.