SMBJ24 Equivalent & Substitute Parts

Part Overview

The SMBJ24 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 24V reverse standoff voltage with a 40.85V maximum clamping voltage and 15.5A peak pulse current capability in a DO-214AA (SMB) package. The SMBJ24 is classified as obsolete; equivalent and substitute parts listed below provide active alternatives with comparable or enhanced electrical characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	24	V
Voltage - Breakdown (Min)	25.29	V
Voltage - Clamping (Max) @ Ipp	40.85	V
Current - Peak Pulse (10/1000µs)	15.5	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMBJ24 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 24V
Voltage - Clamping (Max) @ Ipp: Must not exceed 40.85V (lower values acceptable)
Current - Peak Pulse (10/1000µs): Must be ≥15.5A
Power - Peak Pulse: Must be ≥600W
Package / Case: Must be DO-214AA or SMB equivalent
Mounting Type: Must be Surface Mount
RoHS Status: Must maintain ROHS3 Compliance
Moisture Sensitivity Level: Must be MSL 1 or equivalent

All substitute parts listed below meet or exceed these criteria. Parts are grouped by manufacturer and product status (Active vs. Obsolete).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status	Package
SMBJ24	Littelfuse Inc.	24V	40.85V	15.5A	600W	-65 to 150°C	Obsolete	DO-214AA, SMB
SMBJ24A	MDD	24V	38.9V	15.5A	600W	-50 to 150°C	Active	DO-214AA, SMB
SZ1SMB24AT3G	Littelfuse Inc.	24V	38.9V	15.4A	600W	-65 to 150°C	Active	DO-214AA, SMB
SMB10J24A-E3/52	Vishay General Semiconductor - Diodes Division	24V	38.9V	25.7A	1000W	-55 to 150°C	Active	DO-214AA, SMB
SMB10J24A-E3/5B	Vishay General Semiconductor - Diodes Division	24V	38.9V	25.7A	1000W	-55 to 150°C	Active	DO-214AA, SMB
SMBJ24A-13-F	Diodes Incorporated	24V	38.9V	15.4A	600W	-55 to 150°C	Active	DO-214AA, SMB
SMBJ24A-E3/5B	Vishay General Semiconductor - Diodes Division	24V	38.9V	15.4A	600W	-55 to 150°C	Active	DO-214AA, SMB
SMBJ24A-TP	Micro Commercial Co	24V	38.9V	15.4A	600W	-55 to 175°C	Active	DO-214AA, SMB
SMBJ24A-TR	STMicroelectronics	24V	38.9V	16A	600W	-55 to 150°C	Active	DO-214AA, SMB

Engineering Selection Recommendations

All substitute parts listed maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage requirements. Selection should prioritize active product status parts to ensure long-term availability and supply chain stability.

Primary Substitutes (Equivalent Performance):

SMBJ24A (MDD), SMBJ24A-13-F (Diodes Incorporated), SMBJ24A-E3/5B (Vishay), SMBJ24A-TP (Micro Commercial Co), and SMBJ24A-TR (STMicroelectronics) provide equivalent or near-equivalent electrical performance with clamping voltages of 38.9V and peak pulse currents between 15.4A and 16A.

Enhanced Performance Substitutes:

SMB10J24A-E3/52 and SMB10J24A-E3/5B (Vishay) offer higher peak pulse current (25.7A) and power dissipation (1000W), suitable for applications requiring additional margin.

Temperature Considerations:

SZ1SMB24AT3G (Littelfuse) maintains the original -65°C lower operating limit and includes AEC-Q101 automotive qualification.
SMBJ24A-TP (Micro Commercial Co) extends the upper operating temperature to 175°C.

Frequently Asked Questions (FAQ)

Q: Can I substitute the SMBJ24 with any of the listed parts? A: Yes. All listed parts meet the critical substitution criteria: 24V reverse standoff voltage, clamping voltage ≤40.85V, peak pulse current ≥15.5A, and DO-214AA/SMB package compatibility. Electrical performance is equivalent or superior.

Q: What is the difference between the SMBJ24A variants (13-F, E3/5B, TP, TR)? A: These are equivalent parts from different manufacturers with minor variations in peak pulse current (15.4A to 16A) and operating temperature ranges. All meet the core substitution requirements. Differences reflect manufacturer-specific design and packaging options.

Q: Why is the clamping voltage lower in substitute parts (38.9V vs. 40.85V)? A: Lower clamping voltage provides improved protection performance. All substitute parts remain within acceptable limits for 24V standoff applications and do not compromise circuit protection.

Q: Should I use SMB10J24A parts instead of SMBJ24A? A: SMB10J24A parts (25.7A, 1000W) are suitable if your application requires higher transient current handling or power dissipation margin. For standard 15.5A applications, SMBJ24A variants are appropriate.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 rating.

Q: Does the SZ1SMB24AT3G have any special qualifications? A: SZ1SMB24AT3G includes AEC-Q101 automotive qualification and maintains the original -65°C lower operating temperature limit, making it suitable for automotive and extended temperature applications.

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