SMF05T2G Equivalent & Substitute Parts

Part Overview

The SMF05T2G is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 5V reverse standoff voltage with a 12.5V maximum clamping voltage and 12A peak pulse current capability in an SC-70-5 package footprint. The SMF05T2G is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement.

Substiute Parts

SMF05T2G

onsemiIn Stock: 1477SMF05T2G Datasheet

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SMF05.TCT

Semtech CorporationIn Stock: 86108SMF05.TCT Datasheet

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SP0504BAJTG

Littelfuse Inc.In Stock: 8581SP0504BAJTG Datasheet

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SP1001-04JTG

Littelfuse Inc.In Stock: 79394SP1001-04JTG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMF05T2G is determined by the following critical electrical and mechanical parameters:

• Reverse Standoff Voltage: 5V nominal (maximum tolerance 5.5V acceptable for general-purpose applications)
• Clamping Voltage: 12.5V maximum at peak pulse current
• Peak Pulse Current: 12A minimum at 8/20µs waveform
• Package Compatibility: SC-70-5 / 5-TSSOP / SOT-353 footprint
• Unidirectional Configuration: 4-channel diode array
• RoHS3 Compliance: Required for modern procurement

Substitute parts are grouped based on matching these parameters within acceptable engineering tolerances for TVS diode applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SMF05.TCT (Semtech Corporation)

The SMF05.TCT is the closest functional equivalent to the SMF05T2G. It maintains identical electrical specifications: 5V reverse standoff voltage, 12.5V clamping voltage, and 12A peak pulse current. Both components share the same base product number (SMF05) and SC-70-5 package footprint. The SMF05.TCT is in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. The only notable difference is a slightly higher operating temperature maximum of 125°C versus the original 150°C, and increased capacitance (150pF vs. 90pF @ 1MHz). This substitute is suitable for direct replacement in most general-purpose TVS applications.

Secondary Substitute: SP0504BAJTG (Littelfuse Inc.)

The SP0504BAJTG shares the SC-70-5 package and 4-channel unidirectional configuration. However, it features a higher reverse standoff voltage (5.5V maximum) and lower clamping voltage (8.5V maximum), with unspecified peak pulse current and power ratings. This part is suitable only for applications where lower clamping voltage is acceptable and peak pulse current requirements do not exceed the unspecified rating. Operating temperature range is limited to -40°C to 85°C.

Tertiary Substitute: SP1001-04JTG (Littelfuse Inc., AEC-Q101 Qualified)

The SP1001-04JTG is an automotive-grade TVS diode with AEC-Q101 qualification. It maintains the SC-70-5 package and 4-channel configuration but differs significantly in electrical performance: 5.5V reverse standoff, 13V clamping voltage, and only 2A peak pulse current. This part is suitable for automotive applications requiring lower current handling and higher clamping voltage tolerance. It is not recommended as a direct replacement for general-purpose applications requiring 12A peak pulse current capability.

Frequently Asked Questions (FAQ)

Q: Can SMF05.TCT directly replace SMF05T2G in all applications?

A: Yes, for most general-purpose applications. The SMF05.TCT maintains identical voltage and current specifications. The primary consideration is the reduced maximum operating temperature (125°C vs. 150°C junction temperature). Verify that your application does not require sustained operation above 125°C.

Q: What is the key difference between SP0504BAJTG and the original SMF05T2G?

A: The SP0504BAJTG has a lower clamping voltage (8.5V vs. 12.5V) and unspecified peak pulse current rating. It is suitable only for applications tolerating lower clamping voltage and lower current transients. Peak pulse current specifications are not provided for this part.

Q: Is SP1001-04JTG suitable for general-purpose applications?

A: No. The SP1001-04JTG is designed for automotive applications with AEC-Q101 qualification. Its 2A peak pulse current is significantly lower than the SMF05T2G's 12A rating, making it unsuitable for high-current transient suppression. Use this part only in automotive designs where current requirements are lower.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the SC-70-5 (5-TSSOP, SOT-353) package, ensuring mechanical and footprint compatibility with the original SMF05T2G design.

Q: What compliance certifications apply to these TVS diodes?

A: All parts listed are ROHS3 compliant and REACH unaffected. The SP1001-04JTG additionally carries AEC-Q101 automotive qualification. All parts have unlimited moisture sensitivity rating (MSL 1).

Q: How does capacitance affect TVS diode substitution?

A: Capacitance values (90pF for SMF05T2G vs. 150pF for SMF05.TCT) may impact high-frequency circuit performance. In applications sensitive to parasitic capacitance, verify that the substitute part's capacitance does not degrade signal integrity or introduce unwanted coupling effects.

Q: What is the difference between peak pulse current specifications?

A: Peak pulse current defines the maximum transient current the TVS diode can safely suppress. The SMF05T2G and SMF05.TCT both handle 12A at 8/20µs waveform. The SP1001-04JTG handles only 2A, making it unsuitable for high-energy transient events. Verify your application's transient current magnitude before selecting a substitute.