1SMB15CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMB15CAT3 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 24A peak pulse current capability in the DO-214AA (SMB) package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMB15CAT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	15V
Voltage - Breakdown (Min)	16.7V
Voltage - Clamping (Max) @ Ipp	24.4V
Current - Peak Pulse (10/1000µs)	24A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Operating Temperature	-65°C ~ 150°C (TJ)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 1SMB15CAT3 is determined by strict electrical and mechanical parameter matching:

Critical Matching Parameters:

Voltage - Reverse Standoff: 15V
Voltage - Breakdown (Min): 16.7V
Voltage - Clamping (Max) @ Ipp: 24.4V
Current - Peak Pulse (10/1000µs): 24A minimum
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Type: Zener, Bidirectional, Single Channel

All substitute parts listed maintain these electrical specifications within the allowed tolerances. Mechanical compatibility is ensured through identical SMB package designation. Substitute parts are classified as either direct equivalents (identical specifications) or similar alternatives (minor variations in peak pulse current within acceptable range).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Operating Temperature	Product Status	RoHS Status
1SMB15CAT3	onsemi	15V	16.7V	24.4V	24A	600W	-65°C ~ 150°C	Obsolete	RoHS non-compliant
SMBJ15CA	EVVO Semi	15V	16.7V	24.4V	24.6A	600W	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ15CA-TR	STMicroelectronics	15V	16.7V	24.4V	25.1A	600W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ15CA/54	Vishay General Semiconductor - Diodes Division	15V	16.7V	24.4V	24.6A	600W	-55°C ~ 150°C	Active	RoHS non-compliant
SMBJ15CA-13-F	Diodes Incorporated	15V	16.7V	24.4V	24A	600W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ15CA-HR	Littelfuse Inc.	15V	16.7V	24.4V	24.6A	600W	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ15CA-HRA	Littelfuse Inc.	15V	16.7V	24.4V	24.6A	600W	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ15CA-M3/52	Vishay General Semiconductor - Diodes Division	15V	16.7V	24.4V	24.6A	600W	-55°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For RoHS3 Compliant Applications: SMBJ15CA (EVVO Semi), SMBJ15CA-TR (STMicroelectronics), SMBJ15CA-13-F (Diodes Incorporated), SMBJ15CA-HR (Littelfuse Inc.), and SMBJ15CA-HRA (Littelfuse Inc.) all meet ROHS3 compliance requirements. These parts are suitable for applications requiring regulatory compliance with modern environmental standards.

For Extended Temperature Range (-65°C): SMBJ15CA (EVVO Semi), SMBJ15CA-HR (Littelfuse Inc.), and SMBJ15CA-HRA (Littelfuse Inc.) maintain the full -65°C to 150°C operating temperature range of the original 1SMB15CAT3. These options are preferred for applications requiring operation at lower ambient temperatures.

For Highest Peak Pulse Current: SMBJ15CA-TR (STMicroelectronics) provides 25.1A peak pulse current, exceeding the original 24A specification while maintaining all other electrical parameters. This part offers additional margin for transient protection.

For Direct Electrical Equivalence: SMBJ15CA-13-F (Diodes Incorporated) matches the original 24A peak pulse current specification exactly while providing active product status and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I use SMBJ15CA-TR as a direct replacement for 1SMB15CAT3? A: Yes. SMBJ15CA-TR maintains all critical electrical parameters: 15V reverse standoff, 16.7V minimum breakdown, 24.4V maximum clamping voltage, and 600W peak pulse power. The 25.1A peak pulse current exceeds the original 24A specification, providing additional protection margin. The operating temperature range is -55°C to 150°C, which covers the original range above -55°C.

Q: What is the difference between SMBJ15CA-HR and SMBJ15CA-HRA? A: Both parts are manufactured by Littelfuse Inc. and share identical electrical specifications: 15V reverse standoff, 24.4V clamping voltage, and 24.6A peak pulse current. The "-HRA" designation indicates a higher reliability variant. Both maintain the full -65°C to 150°C operating temperature range and are ROHS3 compliant.

Q: Does the package type affect substitution compatibility? A: All substitute parts use the DO-214AA (SMB) package, identical to the original 1SMB15CAT3. This ensures mechanical and thermal compatibility with existing PCB layouts and assembly processes.

Q: Are there inventory considerations when selecting a substitute? A: SMBJ15CA (EVVO Semi) has the highest inventory availability at 187,300 pieces. SMBJ15CA-TR (STMicroelectronics) has 22,520 pieces available. Littelfuse parts (SMBJ15CA-HR and SMBJ15CA-HRA) have lower inventory levels at 891 and 880 pieces respectively. Inventory levels should be evaluated against production volume requirements.

Q: Which substitute offers the best compliance profile? A: All active substitute parts listed are ROHS3 compliant except SMBJ15CA/54 (Vishay). For applications requiring modern environmental compliance, SMBJ15CA (EVVO Semi), SMBJ15CA-TR (STMicroelectronics), SMBJ15CA-13-F (Diodes Incorporated), SMBJ15CA-HR (Littelfuse Inc.), and SMBJ15CA-HRA (Littelfuse Inc.) are suitable choices.

Q: Can I substitute based on peak pulse current alone? A: No. All electrical parameters must be matched: reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse current must all fall within acceptable ranges. Peak pulse current variations of ±1A are acceptable within the 24A specification, but other parameters must remain constant.

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