SA24 TVS Diode Equivalent & Substitute Parts

Part Overview

The SA24 is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This unidirectional zener diode 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 SA24 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the SA24 are qualified based on the following critical parameters that determine functional equivalence:

Voltage - Reverse Standoff (Typ): 24V
Voltage - Clamping (Max) @ Ipp: Within acceptable range for the application
Current - Peak Pulse (10/1000µs): 13.1A minimum
Power - Peak Pulse: 500W minimum
Operating Temperature Range: -55°C to 175°C (TJ)
Mounting Type: Through Hole
Package / Case: DO-204AC, DO-15, Axial
Type: Zener, Unidirectional

The substitute parts SA24A, SA24A-AP, SA24A-BP, and SA24A-TP meet these electrical and mechanical requirements. All substitutes maintain the same reverse standoff voltage, peak pulse current, power dissipation capability, temperature range, and physical package specifications as the original SA24.

Parameter Comparison

Parameter	SA24 (Littelfuse)	SA24A (Fairchild)	SA24A-AP (MCC)	SA24A-BP (MCC)	SA24A-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°C to 175°C	-55°C to 175°C	-55°C to 175°C	-55°C to 175°C	-55°C to 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AC, DO-15	DO-204AC, DO-15	DO-15	DO-15	DO-15
Type	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Obsolete	Active	Active	Active

Engineering Selection Recommendations

All four substitute parts (SA24A, SA24A-AP, SA24A-BP, SA24A-TP) are electrically and mechanically equivalent to the SA24 based on the specified parameters. Selection among these options should be based on the following factors:

Product Status: SA24A-AP, SA24A-BP, and SA24A-TP are classified as Active products manufactured by Micro Commercial Co, ensuring ongoing availability and long-term supply chain support. SA24A (Fairchild Semiconductor) is classified as Obsolete, similar to the original SA24.

Compliance: All substitute parts are ROHS3 compliant and carry the same ECCN (EAR99) and HTSUS (8541.10.0080) classifications as the original SA24, ensuring regulatory compatibility.

Inventory Availability: SA24A-BP offers the highest current inventory (1,045 pcs), followed by SA24A-TP (1,103 pcs) and SA24A-AP (752 pcs), providing flexibility in procurement quantities.

For new designs or long-term production requirements, SA24A-AP, SA24A-BP, or SA24A-TP are preferred due to their Active product status. For immediate replacement in existing applications, any of the four substitutes provide equivalent electrical performance.

Frequently Asked Questions (FAQ)

Q: Can SA24A, SA24A-AP, SA24A-BP, and SA24A-TP be used interchangeably with the SA24?

A: Yes. All substitute parts maintain identical reverse standoff voltage (24V), peak pulse current (13.1A), power dissipation (500W), operating temperature range (-55°C to 175°C), and through-hole axial package specifications. The substitute parts feature slightly lower maximum clamping voltage (38.9V vs. 40.85V), which remains within acceptable operating parameters for general-purpose transient voltage suppression applications.

Q: What is the difference between SA24A and the SA24A-AP, SA24A-BP, SA24A-TP variants?

A: SA24A is manufactured by Fairchild Semiconductor and is classified as Obsolete. SA24A-AP, SA24A-BP, and SA24A-TP are manufactured by Micro Commercial Co and are classified as Active products. The electrical and mechanical specifications are identical across all variants. The suffix designations (AP, BP, TP) typically indicate different manufacturing batches or packaging configurations from Micro Commercial Co, but all maintain the same core electrical performance.

Q: Are there any package compatibility considerations?

A: All substitute parts are specified for DO-204AC (DO-15) axial through-hole mounting. SA24A-AP, SA24A-BP, and SA24A-TP are supplied in DO-15 package format. Verify that your PCB design accommodates standard axial lead spacing and through-hole mounting before component selection.

Q: What compliance certifications apply to these substitute parts?

A: All substitute parts are ROHS3 compliant and classified under ECCN EAR99 with HTSUS code 8541.10.0080, matching the regulatory classification of the original SA24. No additional compliance verification is required for direct substitution.

Q: Which substitute part should be selected for new production designs?

A: SA24A-AP, SA24A-BP, or SA24A-TP are recommended for new production designs due to their Active product status, ensuring long-term availability and supply chain continuity. All three variants offer equivalent electrical performance and are available in sufficient inventory quantities.

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