SM15T68A-E3/9AT Equivalent & Substitute Parts

Part Overview

The SM15T68A-E3/9AT is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 58.1V reverse standoff voltage class and provides 92V maximum clamping voltage with 16.3A peak pulse current capability. The device is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified based on matching electrical parameters, package compatibility, and operational specifications to ensure functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	58.1V
Voltage - Breakdown (Min)	64.6V
Voltage - Clamping (Max) @ Ipp	92V
Current - Peak Pulse (10/1000µs)	16.3A
Power - Peak Pulse	1500W
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature Range	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 58.1V
Voltage - Clamping (Max) @ Ipp: 92V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Product Status: Active

Substitute parts must maintain identical reverse standoff voltage and clamping voltage specifications to ensure equivalent circuit protection performance. Package and mounting type compatibility is mandatory for PCB assembly interchangeability. All identified substitutes meet these core electrical and mechanical requirements.

Parameter Comparison

Parameter	SM15T68A-E3/9AT (Vishay)	1.5SMC68A (Taiwan Semiconductor)	SM15T68A (STMicroelectronics)	SM15T68AY (STMicroelectronics)
Manufacturer	Vishay General Semiconductor	Taiwan Semiconductor Corporation	STMicroelectronics	STMicroelectronics
Voltage - Reverse Standoff (Typ)	58.1V	58.1V	58.1V	58.1V
Voltage - Breakdown (Min)	64.6V	64.6V	64.6V	64.6V
Voltage - Clamping (Max) @ Ipp	92V	92V	121V	121V
Current - Peak Pulse (10/1000µs)	16.3A	17A	83A (8/20µs)	83A (8/20µs)
Power - Peak Pulse	1500W	1500W	1500W	1500W
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature Range	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-40°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Electrical Equivalent: The 1.5SMC68A from Taiwan Semiconductor Corporation provides direct electrical equivalence with matching 58.1V reverse standoff voltage, 92V clamping voltage, and 1500W peak pulse power rating. Current capability is marginally higher at 17A versus 16.3A. Operating temperature range is -55°C to 150°C, which is narrower than the main part by 10°C at the lower limit. All RoHS3 compliance and MSL 1 specifications are maintained.

Higher Performance Alternatives: The SM15T68A and SM15T68AY from STMicroelectronics maintain identical voltage specifications but feature significantly higher peak pulse current ratings (83A at 8/20µs pulse width) and higher clamping voltage (121V). These parts are suitable for applications requiring enhanced transient suppression capability. The SM15T68AY includes automotive-grade qualification (AEC-Q101) with operating temperature range of -40°C to 150°C. The SM15T68A operates across -55°C to 150°C.

All substitute parts are Active status products with full RoHS3 compliance and unlimited moisture sensitivity level, ensuring long-term availability and environmental regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the 1.5SMC68A directly replace the SM15T68A-E3/9AT? A: Yes. The 1.5SMC68A provides direct electrical equivalence with identical reverse standoff voltage (58.1V) and clamping voltage (92V). Both are surface mount DO-214AB/SMC packages with 1500W peak pulse power rating. The primary difference is a 10°C reduction in minimum operating temperature (-55°C versus -65°C).

Q: What is the difference between the SM15T68A and SM15T68AY? A: Both parts share identical electrical specifications (58.1V standoff, 121V clamping, 83A peak pulse current). The SM15T68AY is automotive-grade qualified to AEC-Q101 with operating temperature range of -40°C to 150°C, while the SM15T68A operates from -55°C to 150°C. Packaging differs: SM15T68A uses Cut Tape & Digi-Reel, while SM15T68AY uses Tape & Reel.

Q: Why do the STMicroelectronics parts show higher clamping voltage (121V) than the main part (92V)? A: The STMicroelectronics SM15T68A and SM15T68AY are higher performance variants within the same 58.1V reverse standoff voltage class. The increased clamping voltage (121V) and significantly higher peak pulse current (83A) provide enhanced transient suppression capability. These parts are suitable for applications requiring greater protection margin but maintain the same package compatibility.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All identified substitute parts—1.5SMC68A, SM15T68A, and SM15T68AY—are RoHS3 compliant with MSL 1 (unlimited moisture sensitivity level), matching the environmental and regulatory compliance profile of the SM15T68A-E3/9AT.

Q: What packaging options are available across these parts? A: All parts use DO-214AB/SMC surface mount package. Packaging format differs: SM15T68A-E3/9AT and 1.5SMC68A are supplied in Tape & Reel (TR). The STMicroelectronics SM15T68A uses Cut Tape (CT) & Digi-Reel, while SM15T68AY uses Tape & Reel (TR). All are compatible with standard surface mount assembly equipment.

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