1SMC12AT3 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 1SMC12AT3 is a transient voltage suppressor diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. This component operates with a 12V reverse standoff voltage and provides clamping at 19.9V maximum. The part is classified as obsolete, making identification of functionally equivalent active alternatives necessary for new designs and ongoing production support.

Substiute Parts

1SMC12AT3

onsemiIn Stock: 18151SMC12AT3 Datasheet

Current PartRFQ

SMCJ12A

MDDIn Stock: 27590SMCJ12A Datasheet

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SMCJ12A

MDDIn Stock: 27590SMCJ12A Datasheet

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SMCJ12A-13-F

Diodes IncorporatedIn Stock: 9723SMCJ12A-13-F Datasheet

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SMCJ12A-TP

Micro Commercial CoIn Stock: 3930SMCJ12A-TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1SMC12AT3 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 12V
• Voltage - Clamping (Max) @ Ipp: 19.9V
• Package / Case: DO-214AB, SMC (surface mount)
• Type: Zener diode, unidirectional
• Current - Peak Pulse (10/1000µs): Minimum 75.3A
• Power - Peak Pulse: 1500W (1.5kW)

All identified substitute parts maintain these electrical specifications within the same package form factor, ensuring mechanical and electrical compatibility in existing PCB layouts and circuit designs.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (SMCJ12A from MDD, SMCJ12A-13-F from Diodes Incorporated, and SMCJ12A-TP from Micro Commercial Co) meet the electrical and mechanical requirements for direct replacement of the 1SMC12AT3.

Compliance Advantage: The substitute parts are ROHS3 compliant, whereas the original 1SMC12AT3 is RoHS non-compliant. For new designs or production requiring RoHS compliance, any of the three substitutes is suitable.

Temperature Range Consideration: SMCJ12A-TP offers the widest operating temperature range (-55°C ~ 175°C), providing additional thermal margin for applications with elevated ambient or junction temperature requirements. SMCJ12A-13-F and SMCJ12A from MDD support -55°C ~ 150°C and -50°C ~ 150°C respectively.

Availability and Packaging: SMCJ12A (MDD) offers the highest inventory (27,540 pcs). SMCJ12A-13-F (Diodes Incorporated) is supplied in Tape & Reel packaging with 9,708 pcs available. SMCJ12A-TP (Micro Commercial Co) is also Tape & Reel packaged with 3,859 pcs in stock.

Frequently Asked Questions (FAQ)

Q: Can SMCJ12A, SMCJ12A-13-F, and SMCJ12A-TP be used interchangeably with 1SMC12AT3?

A: Yes. All three parts share identical voltage specifications (12V reverse standoff, 19.9V clamping), equivalent peak pulse current ratings (75.3–75.4A), and the same DO-214AB/SMC package form factor. They are direct electrical and mechanical equivalents.

Q: What is the primary reason to substitute the 1SMC12AT3?

A: The 1SMC12AT3 is obsolete. The substitute parts are active products with confirmed ongoing availability and manufacturing support. Additionally, the substitutes are RoHS3 compliant, whereas the original part is RoHS non-compliant.

Q: Are there differences in peak pulse current between the substitutes?

A: The differences are negligible. SMCJ12A and SMCJ12A-TP both specify 75.4A, while SMCJ12A-13-F specifies 75.3A. All three meet or exceed the performance envelope of the original part.

Q: Does packaging format (bulk vs. Tape & Reel) affect electrical performance?

A: No. Packaging format affects only handling, storage, and assembly logistics. Electrical and thermal performance remain identical regardless of whether the part is supplied in bulk or Tape & Reel format.

Q: Which substitute should I select for high-temperature applications?

A: SMCJ12A-TP supports operation up to 175°C junction temperature, compared to 150°C for the other substitutes. Select SMCJ12A-TP if your application requires the extended upper temperature limit.

Q: Are all substitutes certified for the same compliance standards?

A: Yes. All three substitutes are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.10.0080, matching the regulatory classification of the original part.