SMBJ15 Transient Voltage Suppressor Diode Equivalent & Substitute Parts

Part Overview

The SMBJ15 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 15V reverse standoff voltage with a 25.62V maximum clamping voltage at peak pulse current of 24.6A, housed in a DO-214AA (SMB) package. The SMBJ15 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	15	V
Voltage - Breakdown (Min)	15.84	V
Voltage - Clamping (Max) @ Ipp	25.62	V
Current - Peak Pulse (10/1000µs)	24.6	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMBJ15 is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff: 15V (exact match required)
Voltage - Clamping (Max) @ Ipp: 24.4V to 25.62V (acceptable range)
Current - Peak Pulse (10/1000µs): 24A to 24.6A minimum (acceptable range)
Power - Peak Pulse: 600W minimum (acceptable range)
Package / Case: DO-214AA or DO-214AC (SMB or SMA variants)
Mounting Type: Surface Mount
Type: Zener, Unidirectional (1 channel)
Operating Temperature: -55°C to 175°C minimum range
RoHS Status: ROHS3 Compliant

All identified substitute parts meet these criteria and are classified as Active products, ensuring long-term availability and production support.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package / Case	Operating Temperature (°C)	Product Status
SMBJ15	Littelfuse Inc.	15	25.62	24.6	600	DO-214AA, SMB	-65 to 150	Obsolete
SMBJ15A	EVVO Semi	15	24.4	24.6	600	DO-214AC, SMA	-65 to 150	Active
SZ1SMB15AT3G	Littelfuse Inc.	15	24.4	24	600	DO-214AA, SMB	-65 to 150	Active
SMB10J15A-E3/5B	Vishay General Semiconductor - Diodes Division	15	24.4	41	1000	DO-214AA, SMB	-55 to 150	Active
SMBJ15A-13-F	Diodes Incorporated	15	24.4	24	600	DO-214AA, SMB	-55 to 150	Active
SMBJ15A-E3/5B	Vishay General Semiconductor - Diodes Division	15	24.4	24.6	600	DO-214AA, SMB	-55 to 150	Active
SMBJ15A-TP	Micro Commercial Co	15	24.4	24	600	DO-214AA, SMB	-55 to 175	Active
SMBJ15A-TR	STMicroelectronics	15	24.4	25.1	600	DO-214AA, SMB	-55 to 150	Active
SMBJ15A/54	Vishay General Semiconductor - Diodes Division	15	24.4	24.6	600	DO-214AA, SMB	-55 to 150	Active

Engineering Selection Recommendations

All substitute parts listed maintain electrical equivalence to the SMBJ15 within specified tolerance ranges. Selection should prioritize parts with Active product status to ensure manufacturing continuity and long-term availability.

For applications requiring exact package compatibility with the original DO-214AA (SMB) footprint, the following parts are recommended: SZ1SMB15AT3G (Littelfuse Inc.), SMBJ15A-13-F (Diodes Incorporated), SMBJ15A-E3/5B (Vishay), SMBJ15A-TP (Micro Commercial Co), SMBJ15A-TR (STMicroelectronics), and SMBJ15A/54 (Vishay).

The SMBJ15A from EVVO Semi uses a DO-214AC (SMA) package variant, which differs mechanically from the original SMB footprint and requires PCB layout verification before implementation.

SMB10J15A-E3/5B from Vishay offers enhanced peak pulse current (41A) and power dissipation (1000W), providing additional margin for applications with higher transient stress requirements, though this represents a design upgrade rather than a direct equivalent.

All substitute parts comply with ROHS3 standards and maintain MSL 1 (Unlimited) moisture sensitivity ratings, ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can SMBJ15A from EVVO Semi be used as a direct replacement for SMBJ15?

A: SMBJ15A maintains electrical equivalence (15V standoff, 24.4V clamping, 24.6A peak pulse) but uses a DO-214AC (SMA) package instead of the original DO-214AA (SMB). This requires PCB footprint verification. If the original design uses SMB footprint, alternative parts with DO-214AA packaging are preferred.

Q: What is the difference between SMB10J15A-E3/5B and other SMBJ15 substitutes?

A: SMB10J15A-E3/5B provides higher peak pulse current (41A) and power dissipation (1000W) compared to the standard 24.6A and 600W specifications. This represents an upgraded specification suitable for applications requiring additional transient protection margin, not a direct equivalent.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts comply with ROHS3 standards and are suitable for applications requiring RoHS certification.

Q: Does operating temperature range affect substitution compatibility?

A: The SMBJ15 operates from -65°C to 150°C. Most substitute parts operate from -55°C to 150°C, which is acceptable for most applications. SMBJ15A-TP extends to 175°C maximum, providing additional thermal margin. Verify application temperature requirements before selection.

Q: What packaging options are available for SMBJ15 substitutes?

A: Substitute parts are available in DO-214AA (SMB) and DO-214AC (SMA) packages. DO-214AA (SMB) maintains footprint compatibility with the original SMBJ15. DO-214AC (SMA) requires PCB layout modification. Verify package compatibility with existing PCB designs.

Q: Can SMBJ15A-TP be used in high-temperature applications?

A: SMBJ15A-TP from Micro Commercial Co operates to 175°C junction temperature, exceeding the standard 150°C range. This part is suitable for applications requiring extended thermal performance within the 15V standoff voltage class.

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