SMAJ26C Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SMAJ26C is a 26V Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient protection in surface-mount applications. This component features a 44.21V maximum clamping voltage, 9.5A peak pulse current capability, and 400W peak pulse power rating in a DO-214AC (SMA) package. The SMAJ26C 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
Reverse Standoff Voltage (Typ)	26V
Breakdown Voltage (Min)	27.36V
Clamping Voltage (Max) @ Ipp	44.21V
Peak Pulse Current (10/1000µs)	9.5A
Peak Pulse Power	400W
Package / Case	DO-214AC, SMA
Mounting Type	Surface Mount
Operating Temperature Range	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SMAJ26C is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Reverse Standoff Voltage: 26V (all substitutes must match)
Package / Case: DO-214AC, SMA (physical and electrical compatibility)
Mounting Type: Surface Mount (PCB assembly compatibility)
Bidirectional Channels: 1 (functional equivalence)
Type: Zener (device technology)

Allowable Variation Parameters:

Breakdown Voltage (Min): Range 27.36V to 28.9V (within normal manufacturing tolerance)
Clamping Voltage (Max) @ Ipp: 42.1V to 54.6V (acceptable for transient suppression function)
Peak Pulse Current: 9.5A to 75A (higher current capability acceptable for same voltage class)
Peak Pulse Power: 400W to 600W (higher power rating acceptable)
Operating Temperature Range: -50°C to -65°C minimum; 150°C to 175°C maximum (extended ranges acceptable)

Substitute parts are grouped by clamping voltage performance characteristics, as this parameter directly affects transient suppression effectiveness while maintaining the 26V standoff voltage specification.

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage	Breakdown Voltage (Min)	Clamping Voltage (Max)	Peak Pulse Current	Peak Pulse Power	Operating Temp Range	Product Status
SMAJ26C	Littelfuse Inc.	26V	27.36V	44.21V	9.5A	400W	-65°C ~ 150°C	Obsolete
SMAJ26CA	MDD	26V	28.9V	42.1V	9.5A	400W	-50°C ~ 150°C	Active
SZ1SMA26CAT3G	Littelfuse Inc.	26V	28.9V	42.1V	9.5A	400W	-65°C ~ 150°C	Active
SMA6J26CA-TR	STMicroelectronics	26V	28.9V	47.9V	75A (8/20µs)	600W	-55°C ~ 175°C	Active
SMAJ26CA-13-F	Diodes Incorporated	26V	28.9V	42.1V	9.5A	400W	-55°C ~ 150°C	Active
SMAJ26CA-TP	Micro Commercial Co	26V	28.9V	42.1V	9.5A	400W	-55°C ~ 175°C	Active
SMAJ26CA-TR	STMicroelectronics	26V	28.9V	54.6V	43A (8/20µs)	400W	-55°C ~ 150°C	Active
SMAJ26CAE3/TR13	Microchip Technology	26V	28.9V	42.1V	11.9A	500W	-65°C ~ 150°C	Active
SMAJ26CE3/TR13	Microchip Technology	26V	28.9V	46.6V	10.7A	500W	-65°C ~ 150°C	Active

Engineering Selection Recommendations

Primary Recommendation: SZ1SMA26CAT3G (Littelfuse Inc.)

SZ1SMA26CAT3G provides direct functional equivalence to SMAJ26C with identical operating temperature range (-65°C ~ 150°C) and matching electrical specifications. As an active product from the original manufacturer, this part ensures design continuity and maintains full compliance with ROHS3 and MSL 1 requirements. The SZ1SMA26 series represents the current-generation equivalent within Littelfuse's product portfolio.

Secondary Recommendations (Equivalent Performance):

SMAJ26CA (MDD), SMAJ26CA-13-F (Diodes Incorporated), SMAJ26CAE3/TR13 (Microchip Technology), and SMAJ26CE3/TR13 (Microchip Technology) all maintain the 26V standoff voltage and 42.1V to 46.6V clamping voltage range. These parts are active products with ROHS3 compliance and MSL 1 rating. Selection among these options depends on packaging format availability (tape & reel vs. cut tape) and supply chain requirements.

Alternative for Enhanced Performance: SMA6J26CA-TR (STMicroelectronics)

SMA6J26CA-TR offers increased peak pulse current (75A at 8/20µs) and extended operating temperature range (-55°C ~ 175°C) with 600W peak pulse power. This part is suitable for applications requiring higher transient energy absorption while maintaining 26V standoff voltage protection. The higher clamping voltage (47.9V) remains within acceptable transient suppression parameters.

Alternative for Extended Temperature: SMAJ26CA-TP (Micro Commercial Co)

SMAJ26CA-TP provides extended upper operating temperature limit (175°C) with standard electrical specifications matching SMAJ26CA. This option is appropriate for high-temperature environment applications.

Frequently Asked Questions (FAQ)

Q: Can SMAJ26CA directly replace SMAJ26C?

A: Yes. SMAJ26CA maintains identical 26V standoff voltage, 9.5A peak pulse current, and 400W peak pulse power specifications. The 42.1V clamping voltage is within acceptable variation from the original 44.21V specification. Both parts use DO-214AC (SMA) surface-mount packaging. Verify operating temperature requirements; SMAJ26CA operates to -50°C minimum versus SMAJ26C at -65°C minimum.

Q: What is the difference between clamping voltage variations (42.1V, 46.6V, 47.9V, 54.6V)?

A: Clamping voltage determines the peak voltage level during transient suppression. All listed substitutes maintain the 26V standoff voltage specification. Higher clamping voltages (47.9V, 54.6V) provide slightly less aggressive transient clamping but remain within acceptable protection parameters for 26V circuits. Selection depends on specific circuit transient immunity requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMAJ26C specifications.

Q: What packaging formats are available?

A: Substitute parts are available in multiple packaging formats: tape & reel (TR), cut tape (CT), and bulk. SMAJ26CA-TP and SMAJ26CA-13-F are supplied in tape & reel format. SMAJ26CA is available in bulk. Verify packaging availability with your supplier for production requirements.

Q: Can SMA6J26CA-TR be used as a direct replacement?

A: SMA6J26CA-TR is functionally compatible but offers enhanced performance with 75A peak pulse current and 600W peak pulse power. The higher clamping voltage (47.9V) is acceptable for 26V standoff voltage applications. This part is suitable for applications requiring higher transient energy absorption. Verify that the higher clamping voltage does not exceed downstream component voltage ratings.

Q: What is the difference between Littelfuse SMAJ26C and SZ1SMA26CAT3G?

A: SZ1SMA26CAT3G is the current-generation Littelfuse equivalent to the obsolete SMAJ26C. Both maintain identical 26V standoff voltage and -65°C ~ 150°C operating temperature range. SZ1SMA26CAT3G is an active product with full manufacturing support and supply availability.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message