SMF75AT1 Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The SMF75AT1 is a unidirectional Zener-type transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. The device features a 75V reverse standoff voltage with a maximum clamping voltage of 121V at peak pulse current. The SMF75AT1 is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Substiute Parts

SMF75AT1

onsemiIn Stock: 762SMF75AT1 Datasheet

Current PartRFQ

SMF7.0A

MDDIn Stock: 18332SMF7.0A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMF75AT1 requires matching of critical electrical parameters that define TVS diode functionality: reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse current rating. The SMF75AT1 operates in the 75V standoff class with a 121V maximum clamp voltage and 1.4A peak pulse current capacity.

The substitute part SMF7.0A, manufactured by MDD, operates in a fundamentally different voltage class (7V standoff, 12V clamp) and cannot serve as a direct functional equivalent for the SMF75AT1. This part is listed in the provided substitute field but represents a different product category within the TVS diode family, suitable only for lower-voltage protection applications.

Direct substitution of the SMF75AT1 requires identification of alternative 75V-class TVS diodes with comparable clamping voltage and current ratings in the SOD-123F package. The provided substitute list does not contain a functionally equivalent part for high-voltage applications matching the SMF75AT1 specifications.

Parameter Comparison

Engineering Selection Recommendations

The SMF75AT1 is classified as obsolete and RoHS non-compliant. The SMF7.0A is an active product with ROHS3 compliance; however, it operates at a significantly lower voltage class (7V standoff versus 75V standoff) and is not suitable for applications requiring 75V protection.

Selection of a substitute for the SMF75AT1 must prioritize identification of active, RoHS-compliant TVS diodes operating in the 75V standoff voltage class with comparable clamping voltage and current ratings in compatible surface-mount packages. The provided substitute list does not contain such a part.

Frequently Asked Questions (FAQ)

Q: Can the SMF7.0A replace the SMF75AT1 in my circuit?

A: No. The SMF7.0A operates at 7V standoff voltage with 12V maximum clamp voltage, while the SMF75AT1 operates at 75V standoff with 121V maximum clamp. These parts protect different voltage levels and are not interchangeable.

Q: Why is the SMF75AT1 listed as obsolete?

A: The SMF75AT1 has been discontinued by onsemi. Designs using this part require migration to active, equivalent alternatives for long-term supply assurance.

Q: What are the critical parameters for finding a substitute?

A: Reverse standoff voltage (75V), breakdown voltage (minimum 83.3V), maximum clamping voltage (121V), peak pulse current (1.4A), and package type (SOD-123F) must be matched or exceeded in a substitute part.

Q: Does the SMF7.0A have better RoHS compliance than the SMF75AT1?

A: Yes. The SMF7.0A is ROHS3 compliant, while the SMF75AT1 is RoHS non-compliant. However, compliance alone does not establish functional equivalence for circuit protection applications.

Q: Are there package compatibility considerations?

A: Both parts use SOD-123F surface-mount packaging, ensuring mechanical and footprint compatibility. However, electrical parameters must be matched for functional substitution.