SMAJ26A-13 Equivalent & Substitute Parts

Part Overview

The SMAJ26A-13 is a transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 26V reverse standoff voltage with a 42.1V maximum clamping voltage and 9.5A peak pulse current capability in a compact SMA (DO-214AC) package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	26	V
Voltage - Breakdown (Min)	28.9	V
Voltage - Clamping (Max) @ Ipp	42.1	V
Current - Peak Pulse (10/1000µs)	9.5	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AC (SMA)	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SMAJ26A-13 is determined by strict electrical and mechanical parameter matching:

Critical Matching Parameters:

Voltage - Reverse Standoff: 26V (exact match required)
Voltage - Breakdown (Min): 28.9V (exact match required)
Voltage - Clamping (Max) @ Ipp: 42.1V (exact match required)
Current - Peak Pulse (10/1000µs): 9.5A (exact match required)
Power - Peak Pulse: 400W (exact match required)
Package / Case: DO-214AC (SMA) (exact match required)
Mounting Type: Surface Mount (exact match required)
Operating Temperature Range: -55°C to 150°C minimum (equal or wider range acceptable)

Substitute parts are grouped into two categories:

Group 1: Direct Electrical & Package Equivalents (Identical Specifications) Parts matching all critical electrical parameters and SMA package format with identical or active product status.

Group 2: Higher Performance Alternatives (Enhanced Specifications) Parts with identical voltage ratings but higher current handling or clamping voltage, suitable for applications requiring additional margin or higher transient energy absorption.

Parameter Comparison

Part Number	Manufacturer	Voltage Standoff (V)	Voltage Breakdown Min (V)	Voltage Clamp Max (V)	Current Peak Pulse (A)	Power Peak Pulse (W)	Package	Temp Range (°C)	Product Status	RoHS Status
SMAJ26A-13	Diodes Incorporated	26	28.9	42.1	9.5	400	DO-214AC (SMA)	-55 to 150	Obsolete	Non-compliant
SMAJ26A-13-F	Diodes Incorporated	26	28.9	42.1	9.5	400	DO-214AC (SMA)	-55 to 150	Active	ROHS3 Compliant
SMAJ26A	Meritek	26	28.9	42.1	9.5	400	DO-214AC (SMA)	-55 to 150	Active	ROHS3 Compliant
SMAJ26A-TP	Micro Commercial Co	26	28.9	42.1	9.5	400	DO-214AC (SMA)	-55 to 175	Active	ROHS3 Compliant
PTVS26VS1UR,115	Nexperia USA Inc.	26	28.9	42.1	9.5	400	SOD-123W	-55 to 150	Active	ROHS3 Compliant
SMA6J26A-TP	Micro Commercial Co	26	28.9	42.1	14.3	600	DO-214AC (SMA)	-55 to 175	Active	ROHS3 Compliant
SMA6J26A-E3/5A	Vishay General Semiconductor	26	28.9	47.9	75	4000	DO-214AC (SMA)	-55 to 150	Active	ROHS3 Compliant
SMA6J26A-E3/61	Vishay General Semiconductor	26	28.9	47.9	75	4000	DO-214AC (SMA)	-55 to 150	Active	ROHS3 Compliant
SMA6J26A-TR	STMicroelectronics	26	28.9	47.9	75	600	DO-214AC (SMA)	-55 to 175	Active	ROHS3 Compliant
SM4T30AY	STMicroelectronics	26	28.9	54.6	43	400	DO-214AC (SMA)	-55 to 150	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: SMAJ26A-13-F

SMAJ26A-13-F from Diodes Incorporated is the direct functional equivalent with identical electrical specifications and SMA package format. This part maintains 100% compatibility with the original SMAJ26A-13 design while offering active product status and ROHS3 compliance. Tape & Reel packaging is standard for production environments.

Secondary Recommendation: SMAJ26A-TP

SMAJ26A-TP from Micro Commercial Co provides identical electrical performance with extended operating temperature range (-55°C to 175°C) and active product status. This option is suitable for applications requiring higher thermal margin. Packaging format is DO-214AC (SMA) in Tape & Reel configuration.

Alternative for Enhanced Transient Protection: SMA6J26A-E3/5A or SMA6J26A-E3/61

These Vishay TransZorb® devices maintain the 26V standoff voltage and 28.9V breakdown voltage but provide significantly higher peak pulse current (75A) and power dissipation (4000W). These are suitable for applications requiring greater transient energy absorption while maintaining the same voltage protection threshold. Both parts are ROHS3 compliant and active.

Package Consideration: PTVS26VS1UR,115

Nexperia's PTVS26VS1UR,115 offers identical electrical specifications but in SOD-123W package format. This option is applicable only if PCB layout permits the smaller package footprint. AEC-Q101 automotive qualification is included.

Not Recommended for Direct Substitution: SM4T30AY

While SM4T30AY maintains the 26V standoff voltage, its 54.6V maximum clamping voltage exceeds the original specification. This part introduces higher clamping voltage that may not be compatible with downstream circuit protection requirements.

Frequently Asked Questions (FAQ)

Q: Can SMAJ26A-13-F be used as a direct replacement for SMAJ26A-13?

A: Yes. SMAJ26A-13-F is electrically and mechanically identical to SMAJ26A-13, with matching voltage ratings (26V standoff, 28.9V breakdown, 42.1V clamp), current rating (9.5A peak pulse), and SMA package format. The primary difference is active product status and ROHS3 compliance.

Q: What is the difference between SMAJ26A-TP and SMAJ26A-13-F?

A: Both parts have identical electrical specifications and SMA packaging. SMAJ26A-TP offers an extended operating temperature range (-55°C to 175°C versus -55°C to 150°C) and is sourced from Micro Commercial Co rather than Diodes Incorporated. Selection depends on thermal requirements and supplier availability.

Q: Can SMA6J26A-E3/5A replace SMAJ26A-13?

A: Electrical substitution is possible with design review. Both maintain 26V standoff and 28.9V breakdown voltage. However, SMA6J26A-E3/5A has a higher maximum clamping voltage (47.9V versus 42.1V) and significantly higher peak pulse current (75A versus 9.5A). This part is suitable only if the circuit can tolerate higher clamping voltage and the additional transient energy absorption is beneficial or neutral to system operation.

Q: Why does PTVS26VS1UR,115 use a different package (SOD-123W)?

A: SOD-123W is a smaller surface-mount package than SMA (DO-214AC). While electrically equivalent, SOD-123W requires different PCB footprint and land pattern. This option is only viable if the PCB layout has been redesigned to accommodate the smaller package.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitute parts are ROHS3 compliant. The original SMAJ26A-13 is listed as RoHS non-compliant, making ROHS3-compliant alternatives necessary for applications subject to RoHS regulations.

Q: What is the significance of the "-F" suffix in SMAJ26A-13-F?

A: The "-F" suffix indicates Tape & Reel packaging format, which is standard for automated assembly and production environments. This is a packaging designation rather than an electrical specification change.

Q: Can I use SM4T30AY if my circuit requires higher voltage clamping margin?

A: SM4T30AY is not recommended as a direct substitute due to its 54.6V maximum clamping voltage, which exceeds the original 42.1V specification. Higher clamping voltage may cause incompatibility with downstream protection circuits or voltage-sensitive components. Use only if circuit analysis confirms compatibility with the higher clamping threshold.

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