SA110C-B Equivalent & Substitute Parts

Part Overview

The SA110C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This component is a unidirectional Zener-type TVS diode in a DO-204AC (DO-15) axial through-hole package with a 110V reverse standoff voltage and 177V maximum clamping voltage. The part is classified as obsolete, making identification of equivalent substitute components necessary for ongoing system maintenance, repair, and new design implementations where legacy compatibility is required.

Substiute Parts

SA110C-B

Littelfuse Inc.In Stock: 740SA110C-B Datasheet

Current PartRFQ

SA110CA

Fairchild SemiconductorIn Stock: 9155SA110CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA110C-B is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff (Typ): 110V
• Voltage - Breakdown (Min): 122V
• Voltage - Clamping (Max) @ Ipp: 177V
• Current - Peak Pulse (10/1000µs): 2.9A
• Power - Peak Pulse: 500W
• Type: Zener
• Bidirectional Channels: 1

Mechanical Equivalence Criteria:

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

Compliance Criteria:

• RoHS Status: RoHS Compliant or equivalent environmental standard

The SA110CA from Fairchild Semiconductor meets all electrical and mechanical equivalence criteria and maintains RoHS compliance, qualifying it as a direct substitute for the SA110C-B.

Parameter Comparison

*Operating temperature range: SA110CA has a minimum operating temperature of -55°C versus -65°C for SA110C-B. Applications requiring operation below -55°C require verification against SA110CA specifications.

Engineering Selection Recommendations

Direct Substitution Eligibility:

The SA110CA (Fairchild Semiconductor) is electrically and mechanically equivalent to the SA110C-B across all critical parameters: reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, and peak pulse power. Both components are packaged in DO-204AC (DO-15) axial through-hole format and maintain RoHS compliance.

Compliance Considerations:

Both the SA110C-B and SA110CA are RoHS-compliant components. The SA110CA carries ROHS3 certification, which represents current RoHS compliance standards. Both components are classified as obsolete, indicating limited future availability through standard distribution channels.

Temperature Range Consideration:

The SA110CA operates across a minimum temperature of -55°C, compared to -65°C for the SA110C-B. For applications requiring operation at temperatures below -55°C, the SA110CA must be evaluated against specific system requirements.

Inventory and Availability:

The SA110CA is available in higher inventory quantities (9,088 pieces) compared to the SA110C-B (721 pieces), providing greater availability for procurement and stock management.

Frequently Asked Questions (FAQ)

Q: Can the SA110CA directly replace the SA110C-B in existing designs?

A: The SA110CA is electrically and mechanically equivalent to the SA110C-B. Both components share identical voltage ratings (110V reverse standoff, 177V clamping), current ratings (2.9A peak pulse), and package format (DO-204AC axial through-hole). Direct substitution is supported for applications operating within the SA110CA temperature range of -55°C to 175°C.

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

A: The SA110C-B operates from -65°C to 175°C, while the SA110CA operates from -55°C to 175°C. The SA110CA has a higher minimum operating temperature by 10°C. Applications requiring operation below -55°C should retain the SA110C-B or identify alternative components with lower temperature specifications.

Q: Are both parts RoHS compliant?

A: Yes. The SA110C-B is RoHS Compliant, and the SA110CA is ROHS3 Compliant. Both meet current environmental and hazardous substance restrictions for electronic components.

Q: What is the package format for both components?

A: Both the SA110C-B and SA110CA are packaged in DO-204AC (also designated DO-15) axial through-hole format. This is a standard two-lead axial package for discrete diodes, suitable for through-hole PCB mounting.

Q: Why is the SA110C-B classified as obsolete?

A: The SA110C-B is listed as obsolete by the manufacturer, indicating that production has been discontinued. Obsolete status typically results in limited availability through standard distribution channels. The SA110CA serves as a current-production equivalent for ongoing system support and new designs.

Q: Are there any electrical performance differences between the SA110C-B and SA110CA?

A: No. Both components are specified with identical electrical parameters: 110V reverse standoff voltage, 122V minimum breakdown voltage, 177V maximum clamping voltage, 2.9A peak pulse current, and 500W peak pulse power. Both are Zener-type TVS diodes with single bidirectional channels.

Q: What applications are these components designed for?

A: The SA110C-B is specified for telecom applications. The SA110CA is specified for general-purpose applications. Both components function as transient voltage suppressors for protection against voltage transients and surges in electronic circuits.