SA24ARL Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The SA24ARL is a 24V Transient Voltage Suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in through-hole axial configurations. This component features a 24V reverse standoff voltage with a maximum clamping voltage of 38.9V at peak pulse current of 12.8A. The SA24ARL is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and component 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
Operating Temperature Range	-55°C ~ 150°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 SA24ARL is determined by strict electrical and mechanical parameter matching across the following criteria:

Critical Matching Parameters:

Voltage - Reverse Standoff: 24V
Voltage - Breakdown (Min): 26.7V
Voltage - Clamping (Max) @ Ipp: 38.9V
Current - Peak Pulse (10/1000µs): 12.8A or higher
Power - Peak Pulse: 500W
Package / Case: DO-204AC, DO-15, Axial (through-hole axial configuration)
Type: Zener
Unidirectional Channels: 1

All substitute parts listed maintain these electrical specifications within the defined tolerances and share identical through-hole axial packaging, ensuring mechanical and functional compatibility with the original SA24ARL design.

Parameter Comparison

Parameter	SA24ARL (onsemi)	SA24A (Fairchild)	P5KE24A-AP (MCC)	P5KE24A-BP (MCC)	P5KE24A-TP (MCC)
Voltage - Reverse Standoff (Typ)	24V	24V	24V	24V	24V
Voltage - Breakdown (Min)	26.7V	26.7V	26.7V	26.7V	26.7V
Voltage - Clamping (Max) @ Ipp	38.9V	38.9V	38.9V	38.9V	38.9V
Current - Peak Pulse (10/1000µs)	12.8A	13.1A	12.8A	12.8A	12.8A
Power - Peak Pulse	500W	500W	500W	500W	500W
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Type	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1	1
Product Status	Obsolete	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

SA24A (Fairchild Semiconductor): Direct functional equivalent with identical electrical specifications and through-hole axial packaging. Operating temperature range extends to 175°C, providing broader thermal operating margin. RoHS3 compliant. Product status is obsolete, limiting long-term availability.

P5KE24A-AP, P5KE24A-BP, P5KE24A-TP (Micro Commercial Co): All three variants maintain identical electrical parameters and packaging configuration. Peak pulse current specification of 12.8A matches the original. Operating temperature range extends to 175°C with lower minimum temperature (-65°C). All variants carry active product status, ensuring sustained component availability. REACH compliance status is unaffected. Selection among the three variants depends on packaging and distribution channel requirements, as electrical specifications are equivalent.

For applications requiring long-term component availability and regulatory compliance, the Micro Commercial Co P5KE24A series (AP, BP, TP variants) is preferred due to active product status and extended operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can SA24A be used as a direct replacement for SA24ARL?

A: Yes. Both components share identical electrical specifications: 24V reverse standoff, 26.7V minimum breakdown, 38.9V maximum clamping voltage, and 12.8A peak pulse current. Both use DO-204AC/DO-15 through-hole axial packaging. The primary difference is product status—SA24A is also obsolete, which may impact long-term procurement.

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

A: These three Micro Commercial Co variants are electrically identical with matching voltage ratings, clamping specifications, and peak pulse current. Differences relate to packaging and distribution channels. All three are active products with extended operating temperature ranges (-65°C to 175°C) compared to the original SA24ARL (-55°C to 150°C).

Q: Are the substitute parts compatible with existing PCB layouts designed for SA24ARL?

A: Yes. All substitute parts use identical DO-204AC/DO-15 through-hole axial packaging, ensuring mechanical compatibility with existing board designs and footprints without layout modifications.

Q: What is the impact of the extended operating temperature range in substitute parts?

A: Substitute parts from Fairchild and Micro Commercial Co extend the maximum operating temperature to 175°C compared to SA24ARL's 150°C. This provides additional thermal margin in applications approaching temperature limits. The Micro Commercial Co variants also extend the minimum operating temperature to -65°C, broadening the overall operating envelope.

Q: Are there compliance differences between SA24ARL and the substitute parts?

A: SA24ARL is RoHS non-compliant. SA24A is RoHS3 compliant. The P5KE24A series (AP, BP, TP) variants have REACH unaffected status. For applications requiring regulatory compliance, the Fairchild SA24A or Micro Commercial Co P5KE24A series are appropriate selections.

Q: Why is product status important when selecting a substitute?

A: Product status indicates component availability and manufacturer support. Obsolete components (SA24ARL, SA24A) have limited remaining inventory and no ongoing production. Active products (P5KE24A-AP, P5KE24A-BP, P5KE24A-TP) ensure sustained availability for current and future procurement needs.

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