SA24AG Equivalent & Substitute Parts

Part Overview

The SA24AG is a 24V Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient protection applications. This axial through-hole component features a 38.9V maximum clamping voltage and 12.8A peak pulse current rating in a DO-204AC (DO-15) package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	24V
Voltage - Breakdown (Min)	26.7V
Voltage - Clamping (Max) @ Ipp	38.9V
Current - Peak Pulse (10/1000µs)	12.8A
Power - Peak Pulse	500W
Package / Case	DO-204AC, DO-15, Axial
Mounting Type	Through Hole
Operating Temperature Range	-55°C ~ 150°C (TJ)
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitution for the SA24AG is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff: 24V
Voltage - Breakdown (Min): 26.7V
Voltage - Clamping (Max) @ Ipp: 38.9V
Current - Peak Pulse (10/1000µs): 12.8A minimum
Power - Peak Pulse: 500W
Package / Case: DO-204AC, DO-15, Axial
Mounting Type: Through Hole
Type: Zener, Unidirectional

All substitute parts listed maintain these electrical specifications and physical package compatibility, ensuring direct functional replacement in existing circuit designs.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package	Operating Temperature	Product Status
SA24AG	Littelfuse Inc.	24V	26.7V	38.9V	12.8A	500W	DO-204AC (DO-15)	-55°C ~ 150°C	Obsolete
SA24A	Fairchild Semiconductor	24V	26.7V	38.9V	13.1A	500W	DO-204AC (DO-15)	-55°C ~ 175°C	Obsolete
P5KE24A-AP	Micro Commercial Co	24V	26.7V	38.9V	12.8A	500W	DO-15	-65°C ~ 175°C	Active
P5KE24A-BP	Micro Commercial Co	24V	26.7V	38.9V	12.8A	500W	DO-15	-65°C ~ 175°C	Active
P5KE24A-TP	Micro Commercial Co	24V	26.7V	38.9V	12.8A	500W	DO-15	-65°C ~ 175°C	Active
SA24A-E3/54	Vishay General Semiconductor - Diodes Division	24V	26.7V	38.9V	12.9A	500W	DO-204AC (DO-15)	-55°C ~ 175°C	Active
SA24AHE3/54	Vishay General Semiconductor - Diodes Division	24V	26.7V	38.9V	12.9A	500W	DO-204AC (DO-15)	-55°C ~ 175°C	Active

Engineering Selection Recommendations

For new designs and ongoing procurement, active product status parts are preferred. The P5KE24A series (P5KE24A-AP, P5KE24A-BP, P5KE24A-TP) from Micro Commercial Co and the SA24A-E3/54 and SA24AHE3/54 from Vishay are currently in active production status, ensuring long-term availability and supply chain stability.

The Vishay SA24A-E3/54 and SA24AHE3/54 parts carry ROHS3 compliance and maintain the same operating temperature range as the original SA24AG. The SA24AHE3/54 includes AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.

The Micro Commercial Co P5KE24A variants offer extended lower temperature operation (-65°C minimum) compared to the SA24AG (-55°C minimum), providing additional thermal margin in cold-environment applications. All three P5KE24A variants (AP, BP, TP) are electrically identical and differ only in packaging configuration.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SA24AG with any of these substitute parts?

A: Yes, all listed substitute parts maintain the critical electrical parameters (24V standoff, 26.7V breakdown minimum, 38.9V clamping maximum, 12.8A minimum peak pulse current, 500W peak power) and are packaged in compatible DO-204AC or DO-15 axial through-hole formats. Physical board layout compatibility should be verified for axial component spacing.

Q: What is the difference between P5KE24A-AP, P5KE24A-BP, and P5KE24A-TP?

A: These three Micro Commercial Co parts are electrically identical. The suffix designates different packaging configurations (AP, BP, TP). Selection depends on your procurement and assembly requirements. All three are currently in active production.

Q: Why should I choose an active product over an obsolete one?

A: Active products ensure continued manufacturing, documented supply availability, and manufacturer support. Obsolete parts face potential supply discontinuation and may carry higher procurement costs due to limited inventory.

Q: Does the operating temperature range difference matter for my application?

A: The SA24AG operates from -55°C to 150°C. Substitute parts extend this range to -55°C to 175°C (Vishay) or -65°C to 175°C (Micro Commercial Co). If your application operates within the original -55°C to 150°C window, any substitute is suitable. Extended temperature capability provides additional design margin for future applications.

Q: Are there compliance or certification differences I should consider?

A: The SA24AHE3/54 from Vishay includes AEC-Q101 automotive qualification. All parts listed are ROHS3 compliant. Select based on your application's compliance requirements.

Q: Can I use these parts interchangeably in my existing designs?

A: Yes, provided your PCB layout accommodates the axial through-hole package format. Verify lead spacing and hole diameter compatibility with your board design. All electrical characteristics remain equivalent.

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