1SMC64AT3 Transient Voltage Suppressor (TVS) Diode – Equivalent & Substitute Parts

Part Overview

The 1SMC64AT3 is a unidirectional Zener-type transient voltage suppressor manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 64V reverse standoff voltage, 103V maximum clamping voltage, and 14.6A peak pulse current capability in a DO-214AB (SMC) package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMC64AT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage – Reverse Standoff (Typ)	64V
Voltage – Breakdown (Min)	71.1V
Voltage – Clamping (Max) @ Ipp	103V
Current – Peak Pulse (10/1000µs)	14.6A
Power – Peak Pulse	1500W (1.5kW)
Operating Temperature	–65°C to 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-214AB, SMC
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the 1SMC64AT3 is determined by the following critical electrical and mechanical parameters:

Primary Matching Criteria:

Voltage – Reverse Standoff: 64V (±tolerance acceptable)
Voltage – Clamping (Max) @ Ipp: 103V
Current – Peak Pulse (10/1000µs): 14.6A (minimum acceptable)
Package / Case: DO-214AB (SMC) or equivalent surface-mount form factor
Unidirectional Zener topology

Secondary Considerations:

Product Status: Active preferred (obsolete parts have limited availability)
RoHS Compliance: ROHS3 Compliant preferred for regulatory alignment
Operating Temperature Range: –65°C to 150°C or wider

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical or near-identical electrical specifications and the same package footprint, suitable for direct PCB replacement without design modification.

Similar Alternatives: Parts with comparable voltage and current ratings but potentially different power dissipation or temperature ranges, requiring design review for application-specific requirements.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ)	Breakdown (Min)	Clamp (Max)	Ipp (A)	Power (W)	Temp Range	Package	Status	RoHS
1SMC64AT3	onsemi	64V	71.1V	103V	14.6	1500	–65 to 150°C	DO-214AB (SMC)	Obsolete	Non-compliant
1SMC64A TR13 PBFREE	Central Semiconductor Corp	64V	71.1V	103V	14.6	1500	–65 to 150°C	DO-214AB (SMC)	Active	ROHS3 Compliant
1.5SMC75A	Taiwan Semiconductor Corporation	64.1V	71.3V	103V	15	1500	–55 to 150°C	DO-214AB (SMC)	Active	ROHS3 Compliant
5.0SMDJ64A	Taiwan Semiconductor Corporation	64V	71.1V	103V	48.6	5000	–55 to 175°C	DO-214AB (SMC)	Active	ROHS3 Compliant
5.0SMDJ64A-T7	Littelfuse Inc.	64V	71.1V	103V	48.6	5000	–65 to 150°C	DO-214AB (SMC)	Active	ROHS3 Compliant
SM15T68A	STMicroelectronics	58.1V	64.6V	121V	83	1500	–55 to 150°C	DO-214AB (SMC)	Active	ROHS3 Compliant
SMCJ58E3/TR13	Microchip Technology	58V	64.4V	103V	14.6	1500	–65 to 150°C	DO-214AB (SMC)	Active	ROHS3 Compliant
SMCJ64A	Meritek	64V	71.1V	103V	14.56	1500	–55 to 150°C	DO-214AB (SMC)	Active	ROHS3 Compliant
SMCJ64A-13-F	Diodes Incorporated	64V	71.1V	103V	14.6	1500	–55 to 150°C	DO-214AB (SMC)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

1SMC64A TR13 PBFREE (Central Semiconductor Corp) is the primary direct equivalent. It maintains identical electrical specifications (64V standoff, 103V clamp, 14.6A peak pulse) and package form factor. The part is Active status with ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original 1SMC64AT3.

SMCJ64A (Meritek) and SMCJ64A-13-F (Diodes Incorporated) provide functionally equivalent alternatives with matching voltage and current ratings. Both are Active status and ROHS3 compliant. Operating temperature ranges are –55 to 150°C, which is narrower than the original –65 to 150°C specification.

Higher Power Alternatives (Design Dependent):

5.0SMDJ64A (Taiwan Semiconductor Corporation) and 5.0SMDJ64A-T7 (Littelfuse Inc.) maintain the same voltage specifications but provide significantly higher peak pulse current (48.6A) and power dissipation (5000W). These are suitable for applications requiring enhanced transient energy absorption. The 5.0SMDJ64A-T7 preserves the full –65 to 150°C temperature range.

Lower Voltage Alternative (Application Specific):

SMCJ58E3/TR13 (Microchip Technology) operates at 58V standoff with identical 103V clamping and 14.6A current. This part is suitable only for applications where the lower standoff voltage is acceptable. SM15T68A (STMicroelectronics) provides 58.1V standoff but with significantly higher peak pulse current (83A) and different clamping voltage (121V), requiring full circuit validation.

Compliance and Availability:

All recommended substitutes are Active status with ROHS3 compliance, eliminating the regulatory and availability constraints of the obsolete 1SMC64AT3. Inventory levels vary; verify availability with component distributors for production requirements.

Frequently Asked Questions (FAQ)

Q: Can I use 1SMC64A TR13 PBFREE as a direct replacement for 1SMC64AT3?

A: Yes. Both parts share identical electrical specifications (64V standoff, 103V clamp, 14.6A peak pulse) and the same DO-214AB (SMC) package footprint. The 1SMC64A TR13 PBFREE is Active status and ROHS3 compliant, making it suitable for direct PCB substitution without design modification.

Q: What is the difference between the 1.5SMC75A and the original 1SMC64AT3?

A: The 1.5SMC75A maintains the same 64.1V standoff voltage and 103V clamping voltage with slightly higher peak pulse current (15A vs. 14.6A). The operating temperature range is narrower (–55 to 150°C vs. –65 to 150°C). This part is suitable for replacement in applications not requiring the full –65°C lower temperature limit.

Q: When should I use the 5.0SMDJ64A instead of a direct equivalent?

A: The 5.0SMDJ64A is appropriate for applications experiencing higher transient energy levels. It provides 48.6A peak pulse current and 5000W power dissipation compared to 14.6A and 1500W in the original part. Use this only if circuit analysis confirms the need for enhanced protection; otherwise, direct equivalents are preferred to avoid unnecessary cost and board space considerations.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts are ROHS3 compliant. The original 1SMC64AT3 is RoHS non-compliant, making the substitutes necessary for applications subject to RoHS regulations.

Q: Can I use SMCJ58E3/TR13 as a substitute?

A: SMCJ58E3/TR13 operates at 58V standoff voltage, which is 6V lower than the 1SMC64AT3. This part is suitable only for applications where the lower standoff voltage does not compromise circuit protection requirements. Full circuit validation is required before substitution.

Q: What packaging options are available for these substitutes?

A: All substitute parts use the DO-214AB (SMC) surface-mount package, maintaining identical PCB footprint compatibility with the original 1SMC64AT3. Packaging formats include Tape & Reel (TR) for automated assembly and Cut Tape (CT) for manual placement, depending on the specific part number and manufacturer.

Q: How do I verify compatibility before ordering substitute parts?

A: Confirm that the substitute part's reverse standoff voltage, clamping voltage, and peak pulse current meet or exceed your circuit's protection requirements. Verify the operating temperature range covers your application environment. Confirm the DO-214AB (SMC) package footprint matches your PCB design. Cross-reference the part number with the manufacturer's datasheet for final validation.

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