SA24CA Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA24CA is a 24V Zener transient voltage suppressor diode in DO-15 (DO-204AC) axial package, designed for general-purpose overvoltage protection applications. Manufactured by onsemi, this component features a 38.9V maximum clamping voltage and 12.8A peak pulse current capability with 500W peak pulse power rating. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	SA24CA
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Product Status	Obsolete
Type	Zener
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
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Bidirectional Channels	1
Applications	General Purpose

Substitute Part Grouping Explanation

Substitution for the SA24CA is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 24V
Voltage - Breakdown (Min): 26.7V
Voltage - Clamping (Max) @ Ipp: 38.9V
Current - Peak Pulse (10/1000µs): 12.8A minimum
Power - Peak Pulse: 500W minimum
Bidirectional Channels: 1
Type: Zener

Mechanical Compatibility Criteria:

Mounting Type: Through Hole
Package / Case: DO-204AC or DO-15 (axial configuration)

Substitute parts are grouped into two categories:

Direct Equivalents (Identical Electrical & Mechanical Specifications): Parts that maintain the same voltage ratings, clamping characteristics, peak pulse current, and power dissipation in the same DO-15 package form factor.

Similar Substitutes (Equivalent Voltage Ratings, Enhanced Performance): Parts that maintain identical voltage specifications and clamping characteristics but offer higher peak pulse current and power dissipation capabilities, or alternative package configurations (R-6) while preserving through-hole mounting and axial lead configuration.

Parameter Comparison

Part Number	Manufacturer	Status	Standoff Voltage (Typ)	Breakdown Voltage (Min)	Clamping Voltage (Max)	Peak Pulse Current	Peak Pulse Power	Package	Operating Temp Range
SA24CA	onsemi	Obsolete	24V	26.7V	38.9V	12.8A	500W	DO-15	-
SA24CA	Fairchild Semiconductor	Obsolete	24V	26.7V	38.9V	13.1A	500W	DO-204AC	-55°C ~ 175°C
P5KE24CA-AP	Micro Commercial Co	Active	24V	26.7V	38.9V	12.8A	500W	DO-15	-65°C ~ 175°C
P5KE24CA-BP	Micro Commercial Co	Active	24V	26.7V	38.9V	12.8A	500W	DO-15	-65°C ~ 175°C
P5KE24CA-TP	Micro Commercial Co	Active	24V	26.7V	38.9V	12.8A	500W	DO-15	-65°C ~ 175°C
SA24CA-AP	Micro Commercial Co	Active	24V	26.7V	38.9V	13.1A	500W	DO-15	-55°C ~ 175°C
SA24CA-BP	Micro Commercial Co	Active	24V	26.7V	38.9V	13.1A	500W	DO-15	-55°C ~ 175°C
SA24CA-TP	Micro Commercial Co	Active	24V	26.7V	38.9V	13.1A	500W	DO-15	-55°C ~ 175°C
P6KE27CA	Diotec Semiconductor	Active	23.1V	25.7V	37.5V	16.8A	600W	DO-15	-50°C ~ 175°C
3KP24CA-TP	Micro Commercial Co	Active	24V	26.7V	38.9V	77.1A	3000W	R-6	-55°C ~ 175°C
5KP24CA-G	Comchip Technology	Active	24V	26.7V	38.9V	128.53A	5000W	R-6	-55°C ~ 150°C

Engineering Selection Recommendations

For Direct Replacement (Same Electrical & Mechanical Specifications):

The P5KE24CA series (P5KE24CA-AP, P5KE24CA-BP, P5KE24CA-TP) from Micro Commercial Co provides direct electrical equivalence to the original SA24CA with identical 24V standoff voltage, 26.7V breakdown voltage, 38.9V clamping voltage, 12.8A peak pulse current, and 500W power rating in DO-15 package. All variants are Active status products with REACH compliance and extended operating temperature range (-65°C to 175°C). These parts are suitable for direct PCB substitution without design modification.

The SA24CA variants (SA24CA-AP, SA24CA-BP, SA24CA-TP) from Micro Commercial Co maintain the same electrical specifications with marginally higher peak pulse current (13.1A) and are also Active status with REACH compliance. Operating temperature range is -55°C to 175°C. These parts are functionally equivalent and suitable for direct replacement.

For Enhanced Performance Applications:

The 3KP24CA-TP (Micro Commercial Co) and 5KP24CA-G (Comchip Technology) maintain identical voltage specifications (24V standoff, 26.7V breakdown, 38.9V clamping) but provide significantly higher peak pulse current and power dissipation in R-6 package configuration. These are suitable when higher transient energy absorption is required. Both are Active status products with REACH compliance.

The P6KE27CA (Diotec Semiconductor) offers slightly different voltage characteristics (23.1V standoff, 25.7V breakdown, 37.5V clamping) with enhanced current capability (16.8A) and power rating (600W) in DO-15 package. This part is Active status and ROHS3 compliant. Voltage deviation should be evaluated against specific circuit requirements.

Product Status Consideration:

All recommended substitute parts are Active status products, ensuring ongoing availability and manufacturing support. The original SA24CA (onsemi) is Obsolete; the Fairchild Semiconductor variant is also Obsolete. Active status alternatives eliminate long-term supply chain risk.

Frequently Asked Questions (FAQ)

Q: Can I use P5KE24CA-AP as a direct replacement for SA24CA?

A: Yes. The P5KE24CA-AP maintains identical electrical specifications: 24V standoff voltage, 26.7V breakdown voltage, 38.9V clamping voltage, 12.8A peak pulse current, and 500W power rating. Both use DO-15 axial package. The part is Active status with extended temperature range (-65°C to 175°C) and REACH compliance.

Q: What is the difference between SA24CA-AP, SA24CA-BP, and SA24CA-TP?

A: These three variants from Micro Commercial Co are electrically identical with the same voltage ratings and 13.1A peak pulse current. The suffix designates different packaging or tape configurations (AP, BP, TP). All are suitable for the same application and are functionally interchangeable.

Q: Can I use 3KP24CA-TP or 5KP24CA-G instead of SA24CA?

A: These parts maintain identical voltage specifications but use R-6 package instead of DO-15. They provide significantly higher peak pulse current (77.1A and 128.53A respectively) and power dissipation (3000W and 5000W). Use these only if your circuit board layout accommodates R-6 package and if higher transient energy absorption is required. They are not direct mechanical replacements due to different lead configuration.

Q: Why does P6KE27CA have different voltage ratings?

A: The P6KE27CA has a slightly higher standoff voltage (23.1V vs 24V) and breakdown voltage (25.7V vs 26.7V). While it provides enhanced current capability (16.8A) and power rating (600W), the voltage deviation must be evaluated against your specific circuit protection requirements. This part is suitable only if the lower voltage threshold is acceptable for your application.

Q: Are all substitute parts RoHS compliant?

A: The P5KE24CA series, SA24CA variants, 3KP24CA-TP, and 5KP24CA-G are ROHS3 compliant or REACH unaffected. The P6KE27CA is ROHS3 compliant. All recommended substitutes meet current environmental compliance standards.

Q: What is the operating temperature range difference?

A: The P5KE24CA series operates from -65°C to 175°C, providing wider low-temperature capability than SA24CA variants (-55°C to 175°C). The 5KP24CA-G operates to -55°C to 150°C. Select based on your application's thermal requirements.

Q: Can I mix different substitute parts in the same design?

A: Yes, provided they meet your electrical specifications. However, for consistency and simplified procurement, use a single part number across your design. If mixing is necessary, ensure all selected parts maintain the required voltage ratings and current capabilities for your protection circuit.

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