SMF75AT1G Equivalent & Substitute Parts

Part Overview

The SMF75AT1G is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 75V reverse standoff voltage with a 121V maximum clamping voltage and 1.4A peak pulse current capability in a compact SOD-123FL package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement.

Substiute Parts

SMF75AT1G

onsemiIn Stock: 1199SMF75AT1G Datasheet

Current PartRFQ

SMF75A-T13

Littelfuse Inc.In Stock: 898SMF75A-T13 Datasheet

DirectRFQ

SMF75A-TP

Micro Commercial CoIn Stock: 1192SMF75A-TP Datasheet

DirectRFQ

SMF7.0A

MDDIn Stock: 18332SMF7.0A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SMF75AT1G is determined by strict electrical and mechanical parameter matching within the TVS diode category. The critical parameters governing substitutability are:

Direct Substitutes (Electrical & Mechanical Equivalence):

• Voltage - Reverse Standoff: 75V (±tolerance)
• Voltage - Clamping (Max) @ Ipp: 121V (±tolerance)
• Current - Peak Pulse: 1.4A (±tolerance)
• Power - Peak Pulse: 200W
• Package / Case: SOD-123F
• Mounting Type: Surface Mount
• Unidirectional Channels: 1

Parts meeting all these criteria are classified as direct substitutes and are electrically and mechanically interchangeable without circuit modification.

Similar Parts (Different Voltage Rating):

• Parts with different voltage ratings (e.g., SMF7.0A with 7V standoff) are classified as similar but not direct substitutes. These are suitable only for circuits designed for their specific voltage class and cannot replace the SMF75AT1G without circuit redesign.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Recommended for SMF75AT1G Replacement):

SMF75A-T13 (Littelfuse Inc.) and SMF75A-TP (Micro Commercial Co) are direct electrical and mechanical equivalents to the obsolete SMF75AT1G. Both parts maintain identical voltage ratings (75V standoff, 121V clamping), current specifications (1.4A peak pulse), and package form factor (SOD-123F surface mount). Both substitute parts carry active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. Selection between these two direct substitutes may be based on packaging preference (Tape & Reel availability) and supplier lead time.

Similar Part (Not Recommended as Direct Replacement):

SMF7.0A (MDD) is a TVS diode within the same SMF series but with fundamentally different electrical characteristics: 7V standoff voltage and 12V clamping voltage versus the 75V and 121V specifications of the SMF75AT1G. This part is suitable only for low-voltage protection circuits and cannot function as a substitute in circuits designed for 75V protection without complete circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can SMF75A-T13 or SMF75A-TP be used as direct replacements for the obsolete SMF75AT1G?

A: Yes. Both SMF75A-T13 and SMF75A-TP are direct electrical and mechanical equivalents. They share identical voltage ratings, current specifications, and SOD-123F package form factor. No circuit modification is required for substitution.

Q: What is the difference between SMF75A-T13 and SMF75A-TP?

A: Both parts are electrically identical with matching 75V standoff and 121V clamping voltages. The primary difference is manufacturer (Littelfuse vs. Micro Commercial Co) and packaging format (both supplied in Tape & Reel). Operating temperature ranges differ slightly: SMF75A-T13 operates -55 to 150°C (TJ), while SMF75A-TP operates -65 to 175°C (TA), providing extended temperature capability for the latter.

Q: Why is SMF7.0A listed as a similar part rather than a direct substitute?

A: SMF7.0A has a 7V reverse standoff voltage and 12V clamping voltage, compared to the 75V and 121V specifications of SMF75AT1G. These are fundamentally different voltage classes designed for different protection applications. Substitution would require complete circuit redesign and is not recommended.

Q: Are there any compliance or regulatory differences between the substitute parts?

A: SMF75A-T13 and SMF75A-TP both carry ROHS3 compliance certification, ensuring regulatory alignment with current environmental standards. The original SMF75AT1G compliance status is not specified in available documentation.

Q: What packaging options are available for the direct substitutes?

A: Both SMF75A-T13 and SMF75A-TP are supplied in Tape & Reel (TR) packaging, standard for high-volume surface-mount assembly. The SOD-123F package form factor is consistent across all substitute options.