SA24C-B Equivalent & Substitute Parts

Part Overview

The SA24C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This component features a 24V reverse standoff voltage with a 38.9V maximum clamping voltage and 13.1A peak pulse current capability in a through-hole DO-204AC (DO-15) axial package. The SA24C-B is classified as obsolete, making identification of equivalent substitute parts essential for ongoing system maintenance, repair, and procurement planning.

Substiute Parts

SA24C-B

Littelfuse Inc.In Stock: 1118SA24C-B Datasheet

Current PartRFQ

SA24CA

Fairchild SemiconductorIn Stock: 4653SA24CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Electrical Specifications:

• Voltage - Reverse Standoff (Typ): 24V
• Voltage - Breakdown (Min): 26.7V
• Voltage - Clamping (Max) @ Ipp: 38.9V
• Current - Peak Pulse (10/1000µs): 13.1A
• Power - Peak Pulse: 500W

Physical & Mechanical Specifications:

• Package / Case: DO-204AC (DO-15) Axial
• Mounting Type: Through Hole
• Bidirectional Channels: 1

Device Classification:

• Type: Zener
• Category: Transient Voltage Suppressors (TVS)

The SA24CA manufactured by Fairchild Semiconductor meets all electrical and mechanical requirements for direct substitution. Both devices share identical voltage ratings, current handling capacity, power dissipation, package configuration, and mounting methodology. Substitution is valid based on parameter equivalence alone.

Parameter Comparison

*Note: SA24CA operating temperature minimum is -55°C versus -65°C for SA24C-B. Applications requiring operation below -55°C require verification against system specifications.

Engineering Selection Recommendations

SA24CA (Fairchild Semiconductor) - Direct Substitute

The SA24CA is electrically and mechanically equivalent to the SA24C-B across all critical transient voltage suppression parameters. Both devices are classified as obsolete, indicating end-of-life status from their respective manufacturers. The SA24CA maintains identical voltage regulation characteristics, peak pulse current capacity, and power dissipation ratings required for telecom and general-purpose transient protection applications.

Compliance Considerations:

The SA24C-B carries RoHS Compliant certification, while the SA24CA carries ROHS3 Compliant certification. Both designations confirm lead-free and hazardous substance compliance suitable for modern electronic assembly standards. The SA24CA's ROHS3 status reflects current regulatory alignment.

Temperature Operating Range:

The SA24C-B specifies an operating temperature range of -65°C to 175°C, while the SA24CA specifies -55°C to 175°C. For applications requiring operation at temperatures below -55°C, the SA24C-B provides extended low-temperature capability. For standard industrial and telecom applications operating within -55°C to 175°C, both devices are functionally equivalent.

Inventory & Availability:

SA24CA inventory availability (4552 pcs) exceeds SA24C-B inventory (1095 pcs), supporting procurement continuity for ongoing production and field replacement requirements.

Frequently Asked Questions (FAQ)

Q: Can SA24CA directly replace SA24C-B in existing circuit designs?

A: Yes. The SA24CA is electrically and mechanically equivalent to the SA24C-B. Both devices share identical voltage ratings (24V standoff, 26.7V breakdown minimum, 38.9V clamping maximum), current handling (13.1A peak pulse), power dissipation (500W), and package configuration (DO-204AC through-hole axial). Direct substitution is valid for applications operating within the SA24CA temperature range of -55°C to 175°C.

Q: What is the temperature operating range difference between these parts?

A: The SA24C-B operates from -65°C to 175°C, while the SA24CA operates from -55°C to 175°C. The SA24C-B provides 10°C additional low-temperature capability. For applications requiring operation below -55°C, the SA24C-B is required. For standard industrial and telecom applications, both devices operate identically across the overlapping -55°C to 175°C range.

Q: Are both parts RoHS compliant?

A: Yes. The SA24C-B is RoHS Compliant, and the SA24CA is ROHS3 Compliant. Both certifications confirm compliance with lead-free and hazardous substance restrictions. ROHS3 represents the current regulatory standard.

Q: What package configuration do these TVS diodes use?

A: Both the SA24C-B and SA24CA use the DO-204AC (DO-15) axial through-hole package. This is a standard two-lead axial component suitable for through-hole PCB assembly and manual insertion applications.

Q: Why is the SA24C-B classified as obsolete?

A: The SA24C-B is end-of-life from Littelfuse Inc. Obsolete status indicates the manufacturer has discontinued production. The SA24CA, also obsolete from Fairchild Semiconductor, serves as an equivalent alternative for ongoing maintenance and repair applications where this specific voltage and current rating is required.

Q: Can these parts be used interchangeably in telecom applications?

A: Yes, within the specified operating temperature range. Both devices are rated for telecom applications and provide identical transient voltage suppression performance across all critical electrical parameters. The SA24CA is additionally rated for general-purpose applications.

Q: What is the peak pulse current rating for these TVS diodes?

A: Both the SA24C-B and SA24CA are rated for 13.1A peak pulse current (10/1000µs waveform), with a maximum clamping voltage of 38.9V at this current level and a peak pulse power rating of 500W.