1SMC6.5AT3 Transient Voltage Suppressor (TVS) Diode – Equivalent & Substitute Parts

Part Overview

The 1SMC6.5AT3 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 6.5V reverse standoff voltage, 11.2V maximum clamping voltage, and 133.9A peak pulse current capability in the DO-214AB (SMC) package. The part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	1SMC6.5AT3	—
Manufacturer	onsemi	—
Category	Transient Voltage Suppressors (TVS)	—
Type	Zener	—
Unidirectional Channels	1	—
Voltage – Reverse Standoff (Typ)	6.5	V
Voltage – Breakdown (Min)	7.22	V
Voltage – Clamping (Max) @ Ipp	11.2	V
Current – Peak Pulse (10/1000µs)	133.9	A
Power – Peak Pulse	1500	W
Operating Temperature Range	−65 to +150	°C (TJ)
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the 1SMC6.5AT3 is determined by strict electrical and mechanical parameter matching within the TVS diode category. The following criteria establish valid equivalence:

Primary Matching Criteria:

Voltage – Reverse Standoff (Typ): 6.5V
Voltage – Clamping (Max) @ Ipp: 11.2V
Current – Peak Pulse (10/1000µs): 130–140A range
Power – Peak Pulse: 1500W
Package / Case: DO-214AB (SMC)
Mounting Type: Surface Mount
Unidirectional Channels: 1

Substitution Categories:

Direct Equivalents – Parts meeting all primary criteria with identical electrical specifications and active product status:

1SMC6.5A TR13 PBFREE (Central Semiconductor Corp)
SMCJ6.5A (Taiwan Semiconductor Corporation)
SMCJ6.5AE3/TR13 (Microchip Technology)
SMCJ6.5A-13-F (Diodes Incorporated)
SMCJ6.5A-HRA (Littelfuse)
SMCJ6.5A-HRAT7 (Littelfuse Inc.)
SMCJ6.5A-M3/57T (Vishay General Semiconductor)
SMCJ6.5A-M3/9AT (Vishay General Semiconductor)

Similar Parts – Components with minor voltage or current parameter variations that may require application-level verification:

SM15T6V8A (STMicroelectronics) – 5.8V standoff, 13.4V clamp, 746A peak pulse

Parameter Comparison

Part Number	Manufacturer	Voltage – Reverse Standoff (V)	Voltage – Clamping (V)	Current – Peak Pulse (A)	Power – Peak Pulse (W)	Operating Temp (°C)	Product Status	RoHS Status
1SMC6.5AT3	onsemi	6.5	11.2	133.9	1500	−65 to +150	Obsolete	Non-compliant
1SMC6.5A TR13 PBFREE	Central Semiconductor Corp	6.5	11.2	133.9	1500	−65 to +150	Active	ROHS3 Compliant
SMCJ6.5A	Taiwan Semiconductor Corporation	6.5	11.2	140	1500	−55 to +150	Active	ROHS3 Compliant
SMCJ6.5AE3/TR13	Microchip Technology	6.5	11.2	133.9	1500	−65 to +150	Active	ROHS3 Compliant
SMCJ6.5A-13-F	Diodes Incorporated	6.5	11.2	133.9	1500	−55 to +150	Active	ROHS3 Compliant
SMCJ6.5A-HRA	Littelfuse	6.5	11.2	134	1500	−65 to +150	Active	ROHS3 Compliant
SMCJ6.5A-HRAT7	Littelfuse Inc.	6.5	11.2	134	1500	−65 to +150	Active	ROHS3 Compliant
SMCJ6.5A-M3/57T	Vishay General Semiconductor	6.5	11.2	133.9	1500	−55 to +150	Active	ROHS3 Compliant
SMCJ6.5A-M3/9AT	Vishay General Semiconductor	6.5	11.2	133.9	1500	−55 to +150	Active	ROHS3 Compliant
SM15T6V8A	STMicroelectronics	5.8	13.4	746 (8/20µs)	1500	−55 to +150	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Selection Path:

For direct replacement of the obsolete 1SMC6.5AT3, select from the direct equivalent group. All candidates maintain identical voltage specifications (6.5V standoff, 11.2V clamp) and equivalent peak pulse current ratings (130–140A). All direct equivalents carry active product status and ROHS3 compliance, addressing regulatory requirements absent in the original component.

Recommended First Choices:

SMCJ6.5AE3/TR13 (Microchip Technology) – Exact electrical match, −65 to +150°C operating range, tape & reel packaging, ROHS3 compliant
1SMC6.5A TR13 PBFREE (Central Semiconductor Corp) – Identical specifications, −65 to +150°C range, ROHS3 compliant
SMCJ6.5A-HRA or SMCJ6.5A-HRAT7 (Littelfuse) – Matched performance, −65 to +150°C range, established reliability in industrial applications

Secondary Selection Path:

The SM15T6V8A (STMicroelectronics) operates at lower standoff voltage (5.8V) and higher clamping voltage (13.4V) with significantly higher peak pulse current (746A at 8/20µs pulse). This part is suitable only for applications where the lower standoff voltage and higher clamping threshold do not conflict with circuit protection requirements.

Compliance Considerations:

All recommended direct equivalents are ROHS3 compliant, addressing environmental and regulatory requirements. The original 1SMC6.5AT3 is RoHS non-compliant; substitution with any active equivalent automatically upgrades compliance status.

Frequently Asked Questions (FAQ)

Q: Can I use SMCJ6.5A as a direct replacement for 1SMC6.5AT3?

A: Yes. SMCJ6.5A meets all primary electrical criteria: 6.5V reverse standoff, 11.2V clamping voltage, and 140A peak pulse current (within the acceptable 130–140A range). The part is active, ROHS3 compliant, and available in high volume. The operating temperature range is −55 to +150°C, which is narrower than the original (−65 to +150°C); verify this meets your application requirements.

Q: What is the difference between 1SMC6.5A TR13 PBFREE and SMCJ6.5AE3/TR13?

A: Both are direct electrical equivalents with identical voltage and current specifications. 1SMC6.5A TR13 PBFREE is manufactured by Central Semiconductor Corp; SMCJ6.5AE3/TR13 is manufactured by Microchip Technology. Both support the full −65 to +150°C operating range and are ROHS3 compliant. Selection depends on supplier availability and procurement lead times.

Q: Why does SM15T6V8A have different voltage ratings?

A: SM15T6V8A is a similar but not equivalent part. It operates at 5.8V standoff (versus 6.5V) and 13.4V clamping (versus 11.2V), with significantly higher peak pulse current (746A). This part is suitable only if your circuit protection strategy accommodates the lower trigger voltage and higher clamping threshold. Do not use as a direct substitute without circuit-level analysis.

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

A: Yes. All direct equivalents and the similar part SM15T6V8A use the DO-214AB (SMC) surface-mount package, ensuring mechanical and footprint compatibility. Verify tape & reel or bulk packaging availability with your supplier, as packaging format may vary by manufacturer and distributor.

Q: What does ROHS3 compliance mean for my design?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The original 1SMC6.5AT3 is RoHS non-compliant. Substitution with any ROHS3-compliant equivalent ensures regulatory alignment for new designs and supports environmental standards in manufacturing and end-of-life disposal.

Q: Can I mix different manufacturers' parts in the same circuit?

A: Yes. All direct equivalents meet identical electrical specifications and are mechanically compatible. Mixing manufacturers is acceptable from an engineering standpoint; however, verify that your procurement and quality assurance processes support multi-source qualification if required by your organization's standards.

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