SMAJ26CA-13 Equivalent & Substitute Parts

Part Overview

The SMAJ26CA-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 DO-214AC (SMA) package. The part is currently listed as obsolete, necessitating identification of functionally equivalent active alternatives from current manufacturers to maintain design continuity and ensure supply chain availability.

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 (TJ)
Package / Case	DO-214AC, SMA	—
Type	Zener	—
Bidirectional Channels	1	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the SMAJ26CA-13 is determined by strict electrical and mechanical parameter matching within the TVS diode category. The following criteria define acceptable equivalents:

Primary Matching Criteria:

Voltage - Reverse Standoff (Typ): 26V
Voltage - Breakdown (Min): 28.9V
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Type: Zener, Bidirectional (1 channel)

Secondary Consideration:

Voltage - Clamping (Max) @ Ipp and Current - Peak Pulse must remain within the specified electrical envelope to ensure circuit protection performance

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents: Parts with identical clamping voltage (42.1V) and peak pulse current (9.5A) specifications. These provide drop-in replacement capability with no circuit redesign required.

Category B - Enhanced Performance Alternatives: Parts with higher clamping voltage or peak pulse current ratings. These offer improved transient suppression capability while maintaining the same reverse standoff and breakdown voltages. Selection requires verification that the circuit design can accommodate the modified clamping characteristics.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Product Status	RoHS Status
SMAJ26CA-13	Diodes Incorporated	26	28.9	42.1	9.5	400	-55 to 150	Obsolete	Non-compliant
SMAJ26CA-13-F	Diodes Incorporated	26	28.9	42.1	9.5	400	-55 to 150	Active	ROHS3 Compliant
P4SMAJ26CA_R1_00001	Panjit International Inc.	26	28.9	42.1	9.5	400	-55 to 150	Active	ROHS3 Compliant
SM4T30CAY	STMicroelectronics	26	28.9	54.6	43 (8/20µs)	400	-55 to 150	Active	ROHS3 Compliant
SMA6J26CA-TR	STMicroelectronics	26	28.9	47.9	75 (8/20µs)	600	-55 to 175	Active	ROHS3 Compliant
SMAJ26CA	MDD	26	28.9	42.1	9.5	400	-50 to 150	Active	ROHS3 Compliant
SMAJ26CA-TP	Micro Commercial Co	26	28.9	42.1	9.5	400	-55 to 175	Active	ROHS3 Compliant
SMAJ26CA-TR	STMicroelectronics	26	28.9	54.6	43 (8/20µs)	400	-55 to 150	Active	ROHS3 Compliant
SMAJ26CAE3/TR13	Microchip Technology	26	28.9	42.1	11.9	500	-65 to 150	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Category A):

SMAJ26CA-13-F (Diodes Incorporated) is the primary recommended substitute. This part maintains identical electrical specifications (42.1V clamping, 9.5A peak pulse current) and is the active production equivalent of the obsolete SMAJ26CA-13. The part is ROHS3 compliant and available in Tape & Reel packaging. This selection requires no circuit modification.

P4SMAJ26CA_R1_00001 (Panjit International Inc.) provides an alternative direct equivalent with matching electrical parameters and active product status. ROHS3 compliance is confirmed.

SMAJ26CA (MDD) offers identical electrical performance with active status and ROHS3 compliance. Operating temperature range is -50°C to 150°C, which is acceptable for most applications within the original -55°C to 150°C specification if the lower temperature limit is not critical.

SMAJ26CA-TP (Micro Commercial Co) provides direct electrical equivalence with extended upper operating temperature to 175°C and ROHS3 compliance, offering improved thermal margin in high-temperature environments.

SMAJ26CAE3/TR13 (Microchip Technology) maintains the 42.1V clamping voltage with slightly elevated peak pulse current (11.9A vs. 9.5A) and enhanced power rating (500W vs. 400W). Extended lower operating temperature (-65°C) provides additional thermal margin. ROHS3 compliant.

Enhanced Performance Alternative (Category B):

SM4T30CAY and SMAJ26CA-TR (both STMicroelectronics) feature higher clamping voltages (54.6V and 47.9V respectively) with significantly increased peak pulse current capability (43A and 75A). These parts are suitable only if circuit design analysis confirms that the elevated clamping voltage does not compromise protected component specifications. Both are ROHS3 compliant and active products.

All recommended substitutes are ROHS3 compliant and carry active product status, ensuring long-term supply chain viability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can SMAJ26CA-13-F be used as a direct replacement for SMAJ26CA-13?

A: Yes. SMAJ26CA-13-F is the active production equivalent with identical electrical specifications (26V reverse standoff, 28.9V breakdown, 42.1V clamping, 9.5A peak pulse current) and DO-214AC (SMA) packaging. The primary difference is product status (active vs. obsolete) and ROHS3 compliance.

Q: What is the difference between Category A and Category B substitutes?

A: Category A substitutes (SMAJ26CA-13-F, P4SMAJ26CA_R1_00001, SMAJ26CA, SMAJ26CA-TP, SMAJ26CAE3/TR13) maintain the 42.1V clamping voltage specification and are direct replacements. Category B substitutes (SM4T30CAY, SMAJ26CA-TR) feature higher clamping voltages (54.6V and 47.9V) and increased peak pulse current, requiring circuit verification before use.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitutes use the DO-214AC (SMA) surface-mount package, ensuring mechanical and footprint compatibility. Packaging formats (Tape & Reel, Cut Tape, bulk) vary by manufacturer and supplier, but the physical component package remains identical.

Q: What is the significance of the operating temperature range differences?

A: The original SMAJ26CA-13 specifies -55°C to 150°C (TJ). Substitutes with identical or extended ranges (such as SMAJ26CA-TP at -55°C to 175°C) provide equivalent or improved thermal performance. The MDD SMAJ26CA variant with -50°C lower limit is acceptable if the application does not require operation below -50°C.

Q: Why do some substitutes have higher peak pulse current ratings?

A: Enhanced alternatives such as SMAJ26CAE3/TR13 (11.9A) and Category B parts (43A to 75A) provide improved transient suppression capability. These are suitable for applications requiring higher energy absorption. Selection must confirm that the circuit design can accommodate the modified electrical characteristics.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All active substitute parts listed are ROHS3 compliant. The original SMAJ26CA-13 is RoHS non-compliant, making compliance upgrade a secondary benefit of substitution.

Q: What packaging options are available for these substitutes?

A: Substitutes are available in Tape & Reel (TR), Cut Tape (CT) with Digi-Reel, and bulk packaging formats depending on manufacturer. All maintain the DO-214AC (SMA) component package for circuit board compatibility.

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