SA26-E3/73 Equivalent & Substitute Parts

Part Overview

The SA26-E3/73 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose transient voltage protection in through-hole applications. This component features a 26V reverse standoff voltage with a 46.6V maximum clamping voltage and 10.7A peak pulse current capability in a DO-204AC (DO-15) axial package.

The SA26-E3/73 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	26V
Voltage - Breakdown (Min)	28.9V
Voltage - Clamping (Max) @ Ipp	46.6V
Current - Peak Pulse (10/1000µs)	10.7A
Power - Peak Pulse	500W
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitution eligibility for the SA26-E3/73 is determined by the following critical parameters:

Voltage - Reverse Standoff: 26V (±tolerance acceptable)
Voltage - Breakdown (Min): 28.9V minimum
Voltage - Clamping (Max) @ Ipp: Maximum 46.6V
Current - Peak Pulse (10/1000µs): Minimum 10.7A
Power - Peak Pulse: Minimum 500W
Mounting Type: Through Hole
Package / Case: DO-204AC, DO-15, or Axial equivalent
Type: Zener, Unidirectional

All substitute parts listed below meet or exceed these electrical and mechanical parameters within the specified tolerances.

Parameter Comparison

Parameter	SA26-E3/73 (Main)	SA26A-E3/73	P6KE30A	SA26A	SA26A-B	SAC26
Manufacturer	Vishay	Vishay	Taiwan Semiconductor	Fairchild	Littelfuse	Littelfuse
Voltage - Reverse Standoff (Typ)	26V	26V	25.6V	26V	26V	26V
Voltage - Breakdown (Min)	28.9V	28.9V	28.5V	28.9V	28.9V	28.9V
Voltage - Clamping (Max) @ Ipp	46.6V	42.1V	41.4V	42.1V	42.1V	42.3V
Current - Peak Pulse (10/1000µs)	10.7A	11.9A	14.5A	12.1A	12.1A	11.1A
Power - Peak Pulse	500W	500W	600W	500W	500W	500W
Operating Temperature	-55°C ~ 175°C	-55°C ~ 175°C	Not specified	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C
Package / Case	DO-204AC, DO-15	DO-204AC, DO-15	DO-204AC, DO-15	DO-204AC, DO-15	DO-204AC, DO-15	DO-204AC, DO-15
Product Status	Obsolete	Active	Active	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: SA26A-E3/73

The SA26A-E3/73 is the direct equivalent from Vishay General Semiconductor - Diodes Division. It maintains identical reverse standoff voltage (26V), breakdown voltage (28.9V), and operating temperature range (-55°C ~ 175°C). The clamping voltage is reduced to 42.1V with increased peak pulse current to 11.9A, both improvements over the original specification. Product status is Active, ensuring long-term availability and supply chain stability. RoHS3 compliance and MSL rating match the original part.

Secondary Recommendation: SA26A-B

The SA26A-B from Littelfuse Inc. provides equivalent electrical performance to SA26A-E3/73 with identical clamping voltage (42.1V) and peak pulse current (12.1A). Product status is Active with full RoHS3 compliance. Packaging is available in Bulk format. This part is suitable for applications where Littelfuse sourcing is preferred or established.

Alternative Recommendation: SAC26

The SAC26 from Littelfuse Inc. (Series SAC) offers comparable performance with 42.3V clamping voltage and 11.1A peak pulse current. Product status is Active with RoHS3 compliance. This part is available in Cut Tape packaging and represents an alternative within the same manufacturer ecosystem.

Cross-Manufacturer Option: P6KE30A

The P6KE30A from Taiwan Semiconductor Corporation provides enhanced performance characteristics with 41.4V clamping voltage and 14.5A peak pulse current, along with increased power dissipation capability (600W vs. 500W). Reverse standoff voltage is 25.6V, which is within acceptable tolerance of the 26V specification. Product status is Active. This part is suitable for applications requiring higher current handling or where Taiwan Semiconductor sourcing is established.

Obsolete Parts (Not Recommended for New Designs):

SA26A from Fairchild Semiconductor is classified as Obsolete and should not be selected for new production designs, despite equivalent electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can SA26A-E3/73 directly replace SA26-E3/73 in existing designs?

A: Yes. SA26A-E3/73 maintains the same reverse standoff voltage (26V), breakdown voltage (28.9V), and operating temperature range. The reduced clamping voltage (42.1V vs. 46.6V) and increased peak pulse current (11.9A vs. 10.7A) represent performance improvements. Both parts use identical DO-204AC (DO-15) axial packaging and are pin-compatible.

Q: What is the difference between SA26A-E3/73 and SA26A-B?

A: Both parts are electrically equivalent with identical voltage and current ratings. The primary difference is packaging format: SA26A-E3/73 is supplied in standard tape format, while SA26A-B is supplied in Bulk. Both are Active products from their respective manufacturers (Vishay and Littelfuse).

Q: Is P6KE30A compatible with SA26-E3/73?

A: P6KE30A is electrically compatible. It features a reverse standoff voltage of 25.6V (within tolerance of 26V), meets the minimum breakdown voltage requirement (28.5V), and provides superior clamping performance (41.4V) with higher peak pulse current (14.5A) and power dissipation (600W). All parts share DO-15 axial through-hole packaging. P6KE30A is suitable for applications where enhanced current handling is beneficial.

Q: Why is SA26A from Fairchild not recommended despite equivalent specifications?

A: SA26A from Fairchild Semiconductor is classified as Obsolete. For new production designs, Active products ensure long-term supply chain availability and manufacturer support. Obsolete parts should be reserved for field replacements of existing equipment only.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (SA26A-E3/73, P6KE30A, SA26A-B, and SAC26) are RoHS3 compliant, matching the compliance status of the original SA26-E3/73.

Q: What is the operating temperature range for P6KE30A?

A: Operating temperature range is not specified in the available technical data for P6KE30A. For applications requiring confirmed temperature specifications, SA26A-E3/73, SA26A-B, or SAC26 are recommended, as all specify -55°C ~ 175°C (TJ).

Q: Can these parts be used interchangeably in the same circuit board layout?

A: Yes. All substitute parts use identical DO-204AC (DO-15) axial through-hole packaging with the same pin configuration and footprint. No PCB layout modifications are required for substitution.

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