1SMB24CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMB24CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 24V reverse standoff voltage with a 38.9V maximum clamping voltage and 15.4A peak pulse current capability in the DO-214AA (SMB) package format. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	24V
Voltage - Breakdown (Min)	26.7V
Voltage - Clamping (Max) @ Ipp	38.9V
Current - Peak Pulse (10/1000µs)	15.4A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Operating Temperature Range	-65°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Bidirectional Channels	1

Substitute Part Grouping Explanation

Substitute parts for the 1SMB24CAT3 are qualified based on the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 24V (exact match required)
Voltage - Breakdown (Min): 26.7V (exact match required)
Voltage - Clamping (Max) @ Ipp: 38.9V (exact match required)
Current - Peak Pulse (10/1000µs): 15.4A minimum (15.5A and 16A acceptable within tolerance)
Power - Peak Pulse: 600W (exact match required)
Package / Case: DO-214AA, SMB (exact match required)
Bidirectional Channels: 1 (exact match required)

All substitute parts listed maintain identical electrical protection characteristics and physical form factor compatibility with the original 1SMB24CAT3 design.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Package	Operating Temperature	Product Status	RoHS Status
1SMB24CAT3	onsemi	24V	38.9V	15.4A	600W	DO-214AA, SMB	-65°C ~ 150°C	Obsolete	RoHS non-compliant
SMBJ24CA	MDD	24V	38.9V	15.5A	600W	DO-214AA, SMB	-50°C ~ 150°C	Active	ROHS3 Compliant
SMBJ24CA-TR	STMicroelectronics	24V	38.9V	16A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ24CA/54	Vishay General Semiconductor - Diodes Division	24V	38.9V	15.4A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	RoHS non-compliant
SMBJ24CA-13-F	Diodes Incorporated	24V	38.9V	15.4A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ24CA-HR	Littelfuse	24V	38.9V	15.5A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ24CA-HRA	Littelfuse Inc.	24V	38.9V	15.5A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ24CA-M3/52	Vishay General Semiconductor - Diodes Division	24V	38.9V	15.4A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain electrical equivalence to the 1SMB24CAT3 across the critical protection parameters: 24V reverse standoff voltage, 38.9V clamping voltage, and 600W peak pulse power rating. Peak pulse current specifications range from 15.4A to 16A, all within acceptable tolerance for this application category.

For new designs, active-status parts are preferred over the obsolete 1SMB24CAT3. Among active substitutes, ROHS3-compliant options (SMBJ24CA from MDD, SMBJ24CA-TR from STMicroelectronics, SMBJ24CA-13-F from Diodes Incorporated, SMBJ24CA-HR and SMBJ24CA-HRA from Littelfuse, and SMBJ24CA-M3/52 from Vishay) align with current regulatory requirements.

Temperature range considerations: The SMBJ24CA-HR, SMBJ24CA-HRA, and 1SMB24CAT3 support -65°C minimum operating temperature. The SMBJ24CA operates to -50°C minimum, while STMicroelectronics SMBJ24CA-TR, Vishay SMBJ24CA/54, Diodes Incorporated SMBJ24CA-13-F, and Vishay SMBJ24CA-M3/52 support -55°C minimum. Selection should account for specific application temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can SMBJ24CA-TR from STMicroelectronics replace 1SMB24CAT3 in all applications?

A: SMBJ24CA-TR is electrically equivalent across all critical protection parameters (24V standoff, 38.9V clamping, 600W peak power). The peak pulse current is 16A versus 15.4A in the original, which is within acceptable tolerance. Operating temperature range is -55°C to 150°C versus -65°C to 150°C in the original. Verify that your application does not require operation below -55°C.

Q: What is the difference between SMBJ24CA-HR and SMBJ24CA-HRA from Littelfuse?

A: Both parts are electrically identical with 24V standoff voltage, 38.9V clamping voltage, 15.5A peak pulse current, and 600W peak power. Both support -65°C to 150°C operating temperature and are ROHS3 compliant. The suffix designations indicate different packaging or tape configurations; consult Littelfuse documentation for specific packaging details.

Q: Why does MDD SMBJ24CA have a narrower operating temperature range (-50°C to 150°C)?

A: The MDD SMBJ24CA maintains all electrical protection specifications identical to the 1SMB24CAT3 but specifies a -50°C minimum operating temperature versus -65°C. This does not affect electrical performance within the specified range. Applications requiring operation below -50°C should select alternatives such as Littelfuse SMBJ24CA-HR, SMBJ24CA-HRA, or the original onsemi part.

Q: Are all substitute parts available in the same DO-214AA SMB package?

A: All listed substitute parts use the DO-214AA (SMB) package format, ensuring mechanical and footprint compatibility with the original 1SMB24CAT3 design. No PCB layout modifications are required for substitution.

Q: Which substitute offers the best RoHS compliance status?

A: SMBJ24CA from MDD, SMBJ24CA-TR from STMicroelectronics, SMBJ24CA-13-F from Diodes Incorporated, SMBJ24CA-HR and SMBJ24CA-HRA from Littelfuse, and SMBJ24CA-M3/52 from Vishay are all ROHS3 compliant. The original 1SMB24CAT3 and Vishay SMBJ24CA/54 are RoHS non-compliant. For new designs subject to RoHS requirements, select from the ROHS3-compliant options.

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