1SMA15CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMA15CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 15V reverse standoff voltage with a 24.4V maximum clamping voltage and 16.4A peak pulse current capability in a DO-214AC (SMA) package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMA15CAT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Package / Case	DO-214AC, SMA
Type	Zener
Bidirectional Channels	1
Voltage - Reverse Standoff (Typ)	15V
Voltage - Breakdown (Min)	16.7V
Voltage - Clamping (Max) @ Ipp	24.4V
Current - Peak Pulse (10/1000µs)	16.4A
Power - Peak Pulse	400W
Operating Temperature	-65°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 1SMA15CAT3 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 15V
Voltage - Breakdown (Min): 16.7V
Voltage - Clamping (Max) @ Ipp: 24.4V
Current - Peak Pulse (10/1000µs): 16.4A
Package / Case: DO-214AC, SMA
Type: Zener, Bidirectional

Substitution Categories:

Direct Equivalents match all critical electrical parameters and package specifications. These parts provide identical functional performance:

SMAJ15CA (EVVO Semi)
SMAJ15CA-13-F (Diodes Incorporated)
SMAJ15CA-TP (Micro Commercial Co)
SMAJ15CAE3/TR13 (Microchip Technology)
TV04A150JB-G (Comchip Technology)

Similar Substitutes share the same reverse standoff voltage (15V) and package (DO-214AC/SMA) but differ in clamping voltage or peak pulse current specifications. These parts are suitable when application requirements permit higher clamping voltages or current ratings:

SM4T18CAY (STMicroelectronics) – 32.5V clamping, 71A peak pulse
SMA6J15CA-TP (Micro Commercial Co) – 24.4V clamping, 24.6A peak pulse
SMAJ15A-TR (STMicroelectronics) – 32.5V clamping, 71A peak pulse
SMAJ15CA-TR (STMicroelectronics) – 32.5V clamping, 71A peak pulse

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	RoHS Status
1SMA15CAT3	onsemi	Obsolete	15V	24.4V	16.4A	400W	-65°C ~ 150°C (TJ)	DO-214AC, SMA	RoHS non-compliant
SMAJ15CA	EVVO Semi	Active	15V	24.4V	16.4A	400W	-65°C ~ 150°C (TJ)	DO-214AC, SMA	ROHS3 Compliant
SMAJ15CA-13-F	Diodes Incorporated	Active	15V	24.4V	16.4A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	ROHS3 Compliant
SMAJ15CA-TP	Micro Commercial Co	Active	15V	24.4V	16.4A	400W	-55°C ~ 175°C (TA)	DO-214AC, SMA	ROHS3 Compliant
SMAJ15CAE3/TR13	Microchip Technology	Active	15V	24.4V	20.6A	500W	-65°C ~ 150°C (TJ)	DO-214AC, SMA	ROHS3 Compliant
TV04A150JB-G	Comchip Technology	Active	15V	24.4V	16.39A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	ROHS3 Compliant
SM4T18CAY	STMicroelectronics	Active	15V	32.5V	71A (8/20µs)	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	ROHS3 Compliant
SMA6J15CA-TP	Micro Commercial Co	Active	15V	24.4V	24.6A	600W	-55°C ~ 175°C (TA)	DO-214AC, SMA	ROHS3 Compliant
SMAJ15A-TR	STMicroelectronics	Active	15V	32.5V	71A (8/20µs)	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	ROHS3 Compliant
SMAJ15CA-TR	STMicroelectronics	Active	15V	32.5V	71A (8/20µs)	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

SMAJ15CA (EVVO Semi) is the primary direct equivalent, offering identical electrical specifications with active product status and ROHS3 compliance. This part is recommended as the first choice for new designs and obsolescence mitigation.

SMAJ15CA-13-F (Diodes Incorporated) and SMAJ15CA-TP (Micro Commercial Co) provide equivalent electrical performance with extended operating temperature ranges (-55°C to 175°C), suitable for applications requiring broader thermal operating windows.

SMAJ15CAE3/TR13 (Microchip Technology) offers enhanced specifications with 20.6A peak pulse current and 500W power rating, providing additional margin for transient protection while maintaining identical clamping voltage.

TV04A150JB-G (Comchip Technology) delivers equivalent performance with active status and full RoHS3 compliance.

For Applications Permitting Higher Clamping Voltage:

SM4T18CAY, SMAJ15A-TR, and SMAJ15CA-TR (all STMicroelectronics) feature 32.5V clamping voltage with significantly higher peak pulse current (71A at 8/20µs). These parts are suitable when circuit design permits higher clamping voltages and require enhanced transient suppression capability.

SMA6J15CA-TP (Micro Commercial Co) provides 24.4V clamping with 24.6A peak pulse current and 600W power rating, offering improved performance margin within the original clamping voltage specification.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant, addressing environmental and regulatory requirements. The original 1SMA15CAT3 is RoHS non-compliant; substitution with any listed part improves regulatory compliance posture.

Frequently Asked Questions (FAQ)

Q: Can SMAJ15CA directly replace 1SMA15CAT3 in existing designs?

A: Yes. SMAJ15CA matches all critical electrical parameters: 15V reverse standoff, 24.4V clamping voltage, and 16.4A peak pulse current. The DO-214AC (SMA) package is identical. No circuit modifications are required.

Q: What is the difference between direct equivalents and similar substitutes?

A: Direct equivalents (SMAJ15CA, SMAJ15CA-13-F, SMAJ15CA-TP, SMAJ15CAE3/TR13, TV04A150JB-G) maintain identical clamping voltage (24.4V) and comparable peak pulse current specifications. Similar substitutes (SM4T18CAY, SMAJ15A-TR, SMAJ15CA-TR) feature higher clamping voltage (32.5V) and significantly higher peak pulse current (71A), suitable only when circuit design permits these parameter variations.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, whereas the original 1SMA15CAT3 is RoHS non-compliant. Substitution improves regulatory compliance.

Q: Does operating temperature range affect substitution suitability?

A: Operating temperature range should be evaluated against application requirements. The original part operates -65°C to 150°C (TJ). Most substitutes operate -55°C to 150°C (TJ), with some extending to 175°C (TA). Verify that the substitute's temperature range meets or exceeds application specifications.

Q: Can I use parts with higher peak pulse current ratings as substitutes?

A: Yes, if circuit design permits. Parts with higher current ratings (such as 20.6A or 24.6A versus 16.4A) provide additional transient suppression margin. However, verify that the clamping voltage remains acceptable for the protected circuit. Parts with 32.5V clamping voltage require circuit-level evaluation before substitution.

Q: What packaging options are available for these substitutes?

A: All listed substitutes use DO-214AC (SMA) surface-mount packaging, identical to the original 1SMA15CAT3. Packaging variations include Cut Tape (CT), Digi-Reel, and Tape & Reel (TR) options, which affect procurement and handling but not electrical performance or PCB compatibility.

Q: Which substitute offers the best performance margin?

A: SMAJ15CAE3/TR13 (Microchip Technology) provides enhanced specifications with 20.6A peak pulse current and 500W power rating while maintaining 24.4V clamping voltage, offering improved transient protection margin within the original voltage specification. SMA6J15CA-TP offers 24.6A peak pulse current and 600W power rating for similar margin enhancement.

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