SA24C Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA24C is a bidirectional Zener TVS diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage suppression applications. This component features a 24V reverse standoff voltage with a 40.85V maximum clamping voltage and 13.1A peak pulse current capability in a through-hole DO-204AC (DO-15) axial package. The SA24C is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. Substitute parts maintain electrical and mechanical compatibility while offering active product status from alternative manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	24	V
Voltage - Breakdown (Min)	25.29	V
Voltage - Clamping (Max) @ Ipp	40.85	V
Current - Peak Pulse (10/1000µs)	13.1	A
Power - Peak Pulse	500	W
Operating Temperature Range	-55 to 175	°C (TJ)
Package / Case	DO-204AC (DO-15)	Axial
Mounting Type	Through Hole	-
Type	Zener	-
Bidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitution of the SA24C is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff: 24V (identical across all substitutes)
Voltage - Clamping (Max) @ Ipp: 40.85V (main part) to 38.9V (substitute parts) - within acceptable tolerance for TVS diode applications
Current - Peak Pulse (10/1000µs): 13.1A (identical across all substitutes)
Power - Peak Pulse: 500W (identical across all substitutes)
Operating Temperature Range: -55°C to 175°C (identical across all substitutes)
Package / Case: DO-204AC, DO-15, Axial (identical across all substitutes)
Mounting Type: Through Hole (identical across all substitutes)
Type: Zener, Bidirectional (identical across all substitutes)

All substitute parts maintain electrical performance within the specified operating parameters and are mechanically compatible with the original SA24C footprint and mounting requirements.

Parameter Comparison

Parameter	SA24C (Littelfuse)	SA24CA (Fairchild)	SA24CA-AP (MCC)	SA24CA-BP (MCC)	SA24CA-TP (MCC)
Voltage - Reverse Standoff (Typ)	24V	24V	24V	24V	24V
Voltage - Breakdown (Min)	25.29V	26.7V	26.7V	26.7V	26.7V
Voltage - Clamping (Max) @ Ipp	40.85V	38.9V	38.9V	38.9V	38.9V
Current - Peak Pulse (10/1000µs)	13.1A	13.1A	13.1A	13.1A	13.1A
Power - Peak Pulse	500W	500W	500W	500W	500W
Operating Temperature Range	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C
Package / Case	DO-204AC (DO-15)	DO-204AC (DO-15)	DO-15	DO-15	DO-15
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Type	Zener	Zener	Zener	Zener	Zener
Bidirectional Channels	1	1	1	1	1
Product Status	Obsolete	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For applications currently using the SA24C, substitute selection should prioritize active product status to ensure long-term availability and supply chain continuity.

SA24CA (Fairchild Semiconductor): This direct equivalent maintains obsolete product status. While electrically compatible, it offers no advantage over the original SA24C regarding future availability.

SA24CA-AP, SA24CA-BP, SA24CA-TP (Micro Commercial Co): All three variants are manufacturer-recommended substitutes with active product status. These parts are functionally equivalent to the SA24C and offer superior long-term supply chain reliability. All three variants are REACH compliant and maintain identical electrical specifications within the specified operating parameters. Selection among these three variants may be based on packaging preferences and inventory availability, as electrical performance is equivalent.

Frequently Asked Questions (FAQ)

Q: Can SA24CA substitute parts be used as direct replacements for SA24C in existing designs?

A: Yes. The SA24CA variants maintain identical reverse standoff voltage (24V), peak pulse current (13.1A), power dissipation (500W), operating temperature range (-55 to 175°C), and through-hole DO-15 package compatibility. The clamping voltage difference (40.85V vs. 38.9V) is within acceptable tolerance for TVS diode applications.

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

A: These three part numbers represent different packaging or tape/reel configurations from Micro Commercial Co, all with identical electrical specifications. Selection should be based on procurement requirements and inventory availability.

Q: Why is product status important for this substitution?

A: The original SA24C is classified as obsolete, meaning future availability cannot be guaranteed. The active-status SA24CA variants from Micro Commercial Co ensure continued supply for production and maintenance applications.

Q: Are there any compliance differences between the main part and substitutes?

A: All parts are ROHS3 compliant or REACH unaffected. The SA24CA variants from Micro Commercial Co carry REACH unaffected status, providing additional regulatory assurance for international applications.

Q: Can these parts be used interchangeably in PCB designs?

A: Yes. All substitute parts use the identical DO-15 axial through-hole package with the same pin configuration and mechanical footprint as the SA24C.

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