1.5SMC39CA-M3/9AT Equivalent & Substitute Parts

Part Overview

The 1.5SMC39CA-M3/9AT is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This bidirectional Zener diode operates with a reverse standoff voltage of 33.3V and provides clamping protection at 53.9V with a peak pulse current of 27.8A. The component is housed in a DO-214AB (SMC) surface mount package and is classified as Active product status. Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters that ensure functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	33.3V
Voltage - Breakdown (Min)	37.1V
Voltage - Clamping (Max) @ Ipp	53.9V
Current - Peak Pulse (10/1000µs)	27.8A
Power - Peak Pulse	1500W (1.5kW)
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature Range	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 1.5SMC39CA-M3/9AT are classified based on the following substitution criteria:

Primary Substitution Parameters:

Voltage - Reverse Standoff (Typ): 33.3V
Voltage - Clamping (Max) @ Ipp: 53.9V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Power - Peak Pulse: 1500W (1.5kW)
RoHS Status: ROHS3 Compliant

Direct Equivalents maintain identical electrical specifications and packaging. These parts are interchangeable without circuit modification.

Functional Equivalents share the same voltage ratings and power dissipation but may have variations in peak pulse current specifications or operating temperature ranges. These parts provide equivalent circuit protection performance within the specified voltage and power parameters.

Cross-Manufacturer Alternatives are sourced from different manufacturers but maintain the same electrical and mechanical specifications, offering supply chain flexibility while preserving circuit functionality.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status
1.5SMC39CA-M3/9AT	Vishay General Semiconductor - Diodes Division	33.3V	53.9V	27.8A	1500W	DO-214AB, SMC	-65°C ~ 150°C	Active
1.5SMC39CA-E3/57T	Vishay General Semiconductor - Diodes Division	33.3V	53.9V	27.8A	1500W	DO-214AB, SMC	-65°C ~ 150°C	Active
1.5SMC39CA	Taiwan Semiconductor Corporation	33.3V	53.9V	29A	1500W	DO-214AB, SMC	-55°C ~ 150°C	Active
SM15T39CA	STMicroelectronics	33.3V	69.7V	143A (8/20µs)	1500W	DO-214AB, SMC	-55°C ~ 150°C	Active
SMCJ1.5KE39CA-TP	Micro Commercial Co	33.3V	53.9V	28.2A	1500W	DO-214AB, SMC	-55°C ~ 175°C	Active
TPSMC39CA	Littelfuse Inc.	33.3V	53.9V	28.2A	1500W	DO-214AB, SMC	-55°C ~ 150°C	Active

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): The 1.5SMC39CA-E3/57T from Vishay General Semiconductor - Diodes Division is a direct equivalent with matching voltage ratings, current specifications, and operating temperature range. Both parts maintain ROHS3 compliance and MSL 1 rating.

Cross-Manufacturer Equivalents (Matching Electrical Performance): The 1.5SMC39CA from Taiwan Semiconductor Corporation, SMCJ1.5KE39CA-TP from Micro Commercial Co, and TPSMC39CA from Littelfuse Inc. provide functional equivalence with identical reverse standoff and clamping voltages. Peak pulse current variations (28.2A to 29A) remain within acceptable tolerance for the 1.5kW power class. All substitute parts maintain ROHS3 compliance and MSL 1 rating. The TPSMC39CA includes AEC-Q101 automotive qualification.

Alternative with Enhanced Performance: The SM15T39CA from STMicroelectronics maintains the 33.3V reverse standoff voltage but features a higher clamping voltage of 69.7V and significantly higher peak pulse current of 143A (8/20µs). This part is suitable for applications requiring enhanced transient suppression capability while maintaining the same package footprint and power rating.

Temperature Consideration: The 1.5SMC39CA-M3/9AT operates to 150°C junction temperature. The SMCJ1.5KE39CA-TP extends to 175°C, providing additional thermal margin for high-temperature applications. The Taiwan Semiconductor Corporation and STMicroelectronics variants operate to 150°C, matching the original specification.

Frequently Asked Questions (FAQ)

Q: Can the 1.5SMC39CA-E3/57T be used as a direct replacement for the 1.5SMC39CA-M3/9AT?

A: Yes. Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications: 33.3V reverse standoff voltage, 53.9V clamping voltage, 27.8A peak pulse current, and 1500W power dissipation. The difference is in packaging configuration (tape reel variant). Both maintain ROHS3 compliance and MSL 1 rating.

Q: What is the difference between the Vishay 1.5SMC39CA-M3/9AT and the Taiwan Semiconductor 1.5SMC39CA?

A: Both parts maintain identical voltage ratings (33.3V standoff, 53.9V clamping) and 1500W power dissipation. The Taiwan Semiconductor variant specifies 29A peak pulse current compared to 27.8A for the Vishay part, representing a 4% increase in current handling. The Taiwan Semiconductor part operates from -55°C to 150°C versus -65°C to 150°C for the Vishay part, providing a narrower low-temperature range. Both are ROHS3 compliant and suitable for telecom applications.

Q: Is the SM15T39CA from STMicroelectronics a suitable substitute?

A: The SM15T39CA maintains the 33.3V reverse standoff voltage and 1500W power rating, ensuring compatibility with the circuit voltage protection scheme. However, the clamping voltage is 69.7V compared to 53.9V for the original part, and peak pulse current is 143A (8/20µs) versus 27.8A. This part provides enhanced transient suppression capability and is suitable for applications requiring higher current handling or stricter clamping control. Package compatibility (DO-214AB, SMC) is maintained.

Q: What are the key parameters that determine substitutability?

A: Substitutability is determined by: (1) Reverse Standoff Voltage - must be 33.3V to maintain circuit bias conditions; (2) Clamping Voltage - must be 53.9V or lower to ensure adequate transient suppression; (3) Power Rating - must be 1500W to handle peak pulse energy; (4) Package Type - must be DO-214AB (SMC) for PCB footprint compatibility; (5) RoHS and MSL compliance - must maintain ROHS3 and MSL 1 ratings for manufacturing and environmental requirements.

Q: Can I use the TPSMC39CA in automotive applications?

A: The TPSMC39CA from Littelfuse Inc. carries AEC-Q101 automotive qualification, making it suitable for automotive circuit protection applications. It maintains identical voltage specifications (33.3V standoff, 53.9V clamping) and 1500W power rating as the original part, with peak pulse current of 28.2A and operating temperature range of -55°C to 150°C. ROHS3 compliance is maintained.

Q: What is the inventory status of substitute parts?

A: The 1.5SMC39CA-E3/57T has 2370 pcs in stock. The Taiwan Semiconductor 1.5SMC39CA has 71486 pcs available. The SM15T39CA has 27741 pcs in stock. The SMCJ1.5KE39CA-TP has 3708 pcs available. The TPSMC39CA has 6200 pcs in stock. All parts are classified as New Original stock.

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