SA48C-B Equivalent & Substitute Parts

Part Overview

The SA48C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This bidirectional Zener diode operates with a 48V reverse standoff voltage and provides 77.4V clamping at peak pulse current. The device is packaged in a DO-204AC (DO-15) through-hole axial configuration.

The SA48C-B carries an obsolete product status. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications requiring this voltage suppression specification.

Substiute Parts

SA48C-B

Littelfuse Inc.In Stock: 725SA48C-B Datasheet

Current PartRFQ

SA48CA

Taiwan Semiconductor CorporationIn Stock: 300442SA48CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA48C-B are identified based on electrical and mechanical parameter equivalence. The following criteria determine substitution validity:

Electrical Parameters (Critical):

• Voltage - Reverse Standoff: 48V
• Voltage - Breakdown (Min): 53.3V
• Voltage - Clamping (Max) @ Ipp: 77.4V
• Current - Peak Pulse (10/1000µs): 6.6A or greater
• Power - Peak Pulse: 500W
• Bidirectional Channels: 1
• Type: Zener

Mechanical Parameters (Critical):

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

Compliance Parameters:

• RoHS Status: RoHS Compliant or equivalent
• Moisture Sensitivity Level: 1 (Unlimited)

The SA48CA meets all substitution criteria and is classified as a direct equivalent for the SA48C-B.

Parameter Comparison

Engineering Selection Recommendations

SA48CA (Taiwan Semiconductor Corporation) is the direct substitute for SA48C-B.

Substitution Basis:

The SA48CA provides electrical equivalence across all critical voltage and current parameters. The peak pulse current rating of 6.7A exceeds the SA48C-B specification of 6.6A, providing enhanced margin. Both devices maintain identical clamping voltage (77.4V) and power dissipation capability (500W).

Compliance Considerations:

The SA48CA holds Active product status, ensuring ongoing availability and manufacturing support. ROHS3 compliance supersedes the RoHS Compliant status of the SA48C-B, meeting current regulatory requirements. REACH Unaffected status confirms no substance restrictions apply.

Temperature Range Consideration:

The SA48CA operating temperature range (-55°C to 175°C) is narrower than the SA48C-B (-65°C to 175°C) at the lower bound. Applications requiring operation below -55°C require verification against specific design requirements.

Packaging:

The SA48CA is supplied in Tape & Reel (TR) packaging, whereas the SA48C-B packaging format is not specified. Both devices use identical DO-204AC (DO-15) through-hole axial package geometry, ensuring mechanical compatibility in PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can SA48CA directly replace SA48C-B in existing designs?

A: Yes. The SA48CA meets all electrical and mechanical specifications for the SA48C-B. Identical voltage ratings, clamping characteristics, and package geometry ensure direct substitution in through-hole PCB applications.

Q: What is the difference in peak pulse current between these devices?

A: The SA48CA is rated at 6.7A peak pulse current compared to the SA48C-B at 6.6A. This 0.1A increase provides additional transient suppression margin without affecting circuit operation.

Q: Are there temperature range limitations with SA48CA?

A: The SA48CA operates from -55°C to 175°C, compared to the SA48C-B range of -65°C to 175°C. Applications requiring operation below -55°C must confirm compatibility with design specifications.

Q: What packaging differences exist between these parts?

A: Both devices use DO-204AC (DO-15) through-hole axial packages. The SA48CA is supplied in Tape & Reel format for automated assembly, while the SA48C-B packaging format is not specified. PCB footprint and lead geometry are identical.

Q: Is the SA48CA RoHS compliant?

A: Yes. The SA48CA is ROHS3 compliant, meeting current environmental and regulatory standards. This exceeds the RoHS Compliant status of the SA48C-B.

Q: What is the moisture sensitivity level for SA48CA?

A: The SA48CA has Moisture Sensitivity Level 1 (Unlimited), indicating no moisture-related handling restrictions during storage or assembly.

Q: Why is the SA48C-B marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The SA48CA provides functional and electrical equivalence, ensuring design continuity and supply chain reliability.