SM15T39CA-M3/9AT Equivalent & Substitute Parts

Part Overview

The SM15T39CA-M3/9AT is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for transient overvoltage protection in surface mount applications, featuring a 33.3V reverse standoff voltage and 53.9V clamping voltage. The part is currently active in production status and widely used in general purpose protection circuits. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility to ensure seamless integration in existing designs or when primary sourcing becomes unavailable.

Substiute Parts

SM15T39CA-M3/9AT

Vishay General Semiconductor - Diodes DivisionIn Stock: 1246SM15T39CA-M3/9AT Datasheet

Current PartRFQ

1.5SMC39CA

Taiwan Semiconductor CorporationIn Stock: 715051.5SMC39CA Datasheet

MFR RecommendedRFQ

1.5SMC39CA

Taiwan Semiconductor CorporationIn Stock: 715051.5SMC39CA Datasheet

MFR RecommendedRFQ

TPSMC39CA

Littelfuse Inc.In Stock: 6241TPSMC39CA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SM15T39CA-M3/9AT are qualified based on the following critical parameters that must match or exceed the original specification:

• Voltage - Reverse Standoff (Typ): 33.3V
• Voltage - Clamping (Max) @ Ipp: 53.9V
• Current - Peak Pulse (10/1000µs): minimum 28A
• Power - Peak Pulse: 1500W
• Package / Case: DO-214AB, SMC
• Mounting Type: Surface Mount
• Bidirectional Channels: 1
• Type: Zener

All identified substitutes maintain these electrical and mechanical parameters within acceptable tolerances, ensuring functional equivalence in transient voltage suppression applications. The substitutes are sourced from established manufacturers with active product status and full RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

All three parts listed—SM15T39CA-M3/9AT (Vishay), 1.5SMC39CA (Taiwan Semiconductor), and TPSMC39CA (Littelfuse)—are active products with full RoHS3 compliance and identical core electrical specifications for transient voltage suppression.

The 1.5SMC39CA from Taiwan Semiconductor provides equivalent performance with slightly higher peak pulse current capability (29A vs. 28A) and is suitable for general purpose and telecom applications.

The TPSMC39CA from Littelfuse meets automotive qualification standards (AEC-Q101) and is graded for automotive applications, making it the appropriate choice for automotive or mission-critical environments requiring enhanced reliability documentation.

Selection between these substitutes should be based on application requirements, supply chain availability, and any specific industry certifications mandated by the end application. All parts are mechanically and electrically interchangeable within the specified parameter ranges.

Frequently Asked Questions (FAQ)

Q: Can the 1.5SMC39CA replace the SM15T39CA-M3/9AT directly?

A: Yes. Both parts share identical voltage specifications (33.3V standoff, 53.9V clamping), equivalent peak pulse current ratings (29A vs. 28A), and the same DO-214AB SMC package. Direct substitution is supported for general purpose and telecom applications.

Q: What is the difference between the Littelfuse TPSMC39CA and the Vishay SM15T39CA-M3/9AT?

A: The TPSMC39CA carries AEC-Q101 automotive qualification and is graded for automotive applications, whereas the SM15T39CA-M3/9AT is specified for general purpose use. Electrical performance is equivalent. The TPSMC39CA is the appropriate choice for automotive designs.

Q: Are all three parts in the same package?

A: Yes. All three parts use the DO-214AB SMC surface mount package, ensuring mechanical compatibility and identical PCB footprints.

Q: What is the operating temperature range difference?

A: The SM15T39CA-M3/9AT operates from -65°C to 150°C, while both the 1.5SMC39CA and TPSMC39CA operate from -55°C to 150°C. For applications requiring operation below -55°C, the Vishay part is required.

Q: Are all parts RoHS3 compliant?

A: Yes. All three parts are ROHS3 compliant and meet environmental regulatory requirements.

Q: Can I use these parts interchangeably in production?

A: Yes, provided the application does not mandate specific automotive qualifications or extended low-temperature operation below -55°C. For automotive applications, use the TPSMC39CA. For general purpose applications requiring extended low-temperature performance, use the SM15T39CA-M3/9AT.