SMF7.5AT1 Equivalent & Substitute Parts

Part Overview

The SMF7.5AT1 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. Featuring a 7.5V reverse standoff voltage and 12.9V maximum clamping voltage, this component provides 200W peak pulse power dissipation with a 15.5A peak pulse current rating in a SOD-123FL package.

The SMF7.5AT1 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this TVS diode specification.

Substiute Parts

SMF7.5AT1

onsemiIn Stock: 1107SMF7.5AT1 Datasheet

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SMF6.5A

MDDIn Stock: 23240SMF6.5A Datasheet

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SMF7.0A

MDDIn Stock: 18332SMF7.0A Datasheet

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SMF7V5A-E3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 20156SMF7V5A-E3-08 Datasheet

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SMF8.0A

Diotec SemiconductorIn Stock: 38424SMF8.0A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMF7.5AT1 are selected based on electrical and mechanical compatibility within the TVS diode category. The primary substitution criteria are:

• Reverse standoff voltage within the 6.5V to 8.0V range
• Maximum clamping voltage between 11.2V and 13.6V
• Peak pulse current capability of 14.71A or greater
• 200W peak pulse power rating
• Surface-mount package compatibility (SOD-123F or equivalent SMF package)
• Operating temperature range supporting -55°C minimum
• Unidirectional channel configuration

Parts meeting these electrical parameters can function as direct substitutes in general-purpose overvoltage protection applications, provided package footprint compatibility is confirmed.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the SMF7.5AT1, the following selection criteria apply:

Direct Electrical Equivalent: The SMF7V5A-E3-08 (Vishay) provides identical reverse standoff voltage (7.5V) and clamping voltage (12.9V) specifications with matching peak pulse current (15.5A). This part maintains full electrical compatibility and is actively produced with ROHS3 compliance. The extended operating temperature range (-65 to 175°C) provides additional thermal margin.

Voltage-Matched Alternatives: The SMF7.0A (MDD) offers a 7.0V standoff voltage with 12.0V clamping, representing a 0.5V reduction in standoff specification. The SMF6.5A (MDD) provides 6.5V standoff with 11.2V clamping, suitable for applications tolerating lower voltage thresholds. Both MDD parts are actively produced with ROHS3 compliance and higher peak pulse current ratings (16.7A and 17.9A respectively).

Higher Voltage Alternative: The SMF8.0A (Diotec) operates at 8.0V standoff with 13.6V clamping, appropriate for applications requiring elevated voltage protection thresholds. This part maintains 200W power rating and active production status.

All substitute parts are surface-mount compatible and support the general-purpose overvoltage protection application category. Selection should be based on specific circuit voltage requirements and compliance mandates for the target application.

Frequently Asked Questions (FAQ)

Q: Can SMF7V5A-E3-08 directly replace SMF7.5AT1 in existing designs?

A: Yes. The SMF7V5A-E3-08 matches the SMF7.5AT1 in reverse standoff voltage (7.5V), breakdown voltage (8.33V), clamping voltage (12.9V), and peak pulse current (15.5A). Both are unidirectional Zener TVS diodes rated for 200W peak pulse power. Package compatibility requires verification: SMF7.5AT1 uses SOD-123FL while SMF7V5A-E3-08 uses DO-219AB (SMF). These packages have identical footprints for surface-mount applications.

Q: What is the difference between SMF6.5A and SMF7.5AT1?

A: The SMF6.5A operates at a lower reverse standoff voltage (6.5V vs. 7.5V) and lower clamping voltage (11.2V vs. 12.9V). This part triggers overvoltage protection at lower voltage thresholds. The SMF6.5A provides higher peak pulse current capability (17.9A vs. 15.5A) and is actively produced with ROHS3 compliance. Selection depends on whether the application circuit requires the lower 6.5V protection threshold.

Q: Is the SMF8.0A suitable as a substitute?

A: The SMF8.0A operates at a higher reverse standoff voltage (8.0V vs. 7.5V) and higher clamping voltage (13.6V vs. 12.9V). This part is appropriate only for applications where the circuit can tolerate delayed overvoltage protection activation. The SMF8.0A maintains 200W power rating and SOD-123F package compatibility but has slightly lower peak pulse current (14.71A vs. 15.5A).

Q: Are all substitute parts RoHS compliant?

A: The SMF7V5A-E3-08, SMF7.0A, and SMF6.5A are ROHS3 compliant. The SMF8.0A has "Not applicable" RoHS status. The original SMF7.5AT1 is RoHS non-compliant. Compliance requirements should be verified against target application and regional regulations.

Q: What is the operating temperature difference between substitutes?

A: The SMF7V5A-E3-08 supports -65 to 175°C, providing the widest temperature range. The SMF7.5AT1, SMF7.0A, and SMF6.5A support -55 to 150°C. The SMF8.0A supports -50 to 150°C. Selection should account for application thermal requirements and environmental operating conditions.

Q: Can multiple substitute parts be used interchangeably in inventory?

A: No. Each substitute part has distinct electrical characteristics. Reverse standoff voltages range from 6.5V to 8.0V, and clamping voltages range from 11.2V to 13.6V. Circuit designs must specify the appropriate part number based on protection voltage requirements. Mixing parts without design verification creates overvoltage protection inconsistency.