SMBJ26 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ26 is a unidirectional Zener-type transient voltage suppressor manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 26V reverse standoff voltage with a 44.21V maximum clamping voltage at peak pulse current of 14.3A, housed in a DO-214AA (SMB) package. The SMBJ26 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	26	V
Voltage - Breakdown (Min)	27.36	V
Voltage - Clamping (Max) @ Ipp	44.21	V
Current - Peak Pulse (10/1000µs)	14.3	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 SMBJ26 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 26V
Voltage - Breakdown (Min): 27.36V to 28.9V range
Voltage - Clamping (Max) @ Ipp: 42.1V to 44.21V range
Current - Peak Pulse (10/1000µs): 12.4A to 23.8A
Power - Peak Pulse: 600W to 1000W
Operating Temperature: -65°C to -55°C minimum; 150°C maximum

Mechanical Compatibility Criteria:

Package / Case: DO-214AA or DO-214AC (SMB or SMA variants)
Mounting Type: Surface Mount
Unidirectional Channels: 1
Type: Zener

Compliance Requirements:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts meeting these criteria are grouped into two categories: direct electrical equivalents with identical or tighter specifications, and functional alternatives with enhanced current-handling capability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status
SMBJ26	Littelfuse Inc.	26V	27.36V	44.21V	14.3A	600W	DO-214AA, SMB	-65 to 150°C	Obsolete
SMBJ26A	EVVO Semi	26V	28.9V	42.1V	14.3A	600W	DO-214AC, SMA	-65 to 150°C	Active
SZ1SMB26AT3G	Littelfuse Inc.	26V	28.9V	42.1V	14.2A	600W	DO-214AA, SMB	-65 to 150°C	Active
SMB10J26A-E3/52	Vishay General Semiconductor - Diodes Division	26V	28.9V	42.1V	23.8A	1000W	DO-214AA, SMB	-55 to 150°C	Active
SMB10J26A-E3/5B	Vishay General Semiconductor - Diodes Division	26V	28.9V	42.1V	23.8A	1000W	DO-214AA, SMB	-55 to 150°C	Active
SMBJ26A-13-F	Diodes Incorporated	26V	28.9V	42.1V	14.2A	600W	DO-214AA, SMB	-55 to 150°C	Active
TV06B260J-G	Comchip Technology	26V	28.9V	42.1V	14.25A	600W	DO-214AA, SMB	Not specified	Active

Engineering Selection Recommendations

Primary Equivalent (Recommended for Direct Replacement):

SZ1SMB26AT3G (Littelfuse Inc.) is the primary recommended substitute. It maintains the original DO-214AA (SMB) package geometry, matches the 26V reverse standoff voltage specification, and operates within the same temperature range (-65 to 150°C). The device is ROHS3 compliant, AEC-Q101 qualified for automotive applications, and carries active product status with substantial inventory availability (64,479 units). The clamping voltage (42.1V) and peak pulse current (14.2A) fall within acceptable tolerance of the original specification.

Secondary Equivalents (Compatible Alternatives):

SMBJ26A-13-F (Diodes Incorporated) provides electrical equivalence with identical clamping characteristics (42.1V, 14.2A) and DO-214AA (SMB) package compatibility. Product status is active with extensive inventory (416,200 units). Operating temperature minimum is -55°C, which is acceptable for most applications requiring the original -65°C specification.

SMBJ26A (EVVO Semi) offers electrical compatibility but uses a DO-214AC (SMA) package variant. This substitution requires PCB layout modification and is suitable only when package footprint changes are permissible. Active product status with high inventory (39,700 units).

Enhanced Current-Handling Alternative:

SMB10J26A-E3/5B and SMB10J26A-E3/52 (Vishay General Semiconductor - Diodes Division, TransZorb® series) provide superior peak pulse current capability (23.8A) and power dissipation (1000W) while maintaining 26V reverse standoff voltage and DO-214AA (SMB) package compatibility. These devices are suitable for applications requiring enhanced transient protection margin. Operating temperature minimum is -55°C. Both variants are active with adequate inventory (1,025 and 30,300 units respectively).

Not Recommended:

SMBJ30A (MDD) operates at 30V reverse standoff voltage, exceeding the 26V specification. This part is electrically incompatible and introduces unacceptable circuit behavior.

Frequently Asked Questions (FAQ)

Q: Can SMBJ26A (EVVO Semi) be used as a direct replacement for SMBJ26?

A: SMBJ26A provides electrical equivalence but uses a DO-214AC (SMA) package instead of the original DO-214AA (SMB). Direct PCB substitution is not possible without layout modification. If package footprint changes are acceptable, SMBJ26A is electrically compatible.

Q: What is the difference between SZ1SMB26AT3G and SMBJ26A-13-F?

A: Both devices meet the 26V reverse standoff voltage and 42.1V clamping voltage specifications. SZ1SMB26AT3G is manufactured by Littelfuse (original manufacturer) with AEC-Q101 automotive qualification and operates from -65 to 150°C. SMBJ26A-13-F is manufactured by Diodes Incorporated and operates from -55 to 150°C. For applications requiring -65°C minimum temperature operation, SZ1SMB26AT3G is the appropriate choice.

Q: Why would I select SMB10J26A-E3/5B over SMBJ26A-13-F?

A: SMB10J26A-E3/5B provides enhanced transient protection capability with 23.8A peak pulse current and 1000W power dissipation compared to 14.2A and 600W for SMBJ26A-13-F. Selection depends on circuit transient severity. If the original 14.3A specification is adequate, SMBJ26A-13-F is the cost-effective choice. If higher transient energy absorption is required, SMB10J26A-E3/5B provides additional margin.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts listed are ROHS3 compliant. Compliance status is verified in the provided specifications.

Q: What is the significance of the DO-214AA versus DO-214AC package designation?

A: DO-214AA and DO-214AC are distinct surface-mount package outlines. DO-214AA (SMB) and DO-214AC (SMA) have different footprint geometries. PCB layout compatibility requires matching package designation. SMBJ26A uses DO-214AC (SMA), while the original SMBJ26 and most recommended substitutes use DO-214AA (SMB).

Q: Can TV06B260J-G be used as a substitute?

A: TV06B260J-G (Comchip Technology) meets the electrical specifications (26V reverse standoff, 42.1V clamping, 14.25A peak pulse current) and uses the DO-214AA (SMB) package. However, operating temperature range is not specified in the provided data. Verification of temperature specifications with the manufacturer is necessary before selection.

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