SA20C-B Equivalent & Substitute Parts

Part Overview

The SA20C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This bidirectional Zener diode operates in the DO-204AC (DO-15) axial through-hole package and provides transient voltage protection with a 20V reverse standoff voltage and 32.4V maximum clamping voltage at peak pulse current.

The SA20C-B carries an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

SA20C-B

Littelfuse Inc.In Stock: 713SA20C-B Datasheet

Current PartRFQ

SA20CA

Taiwan Semiconductor CorporationIn Stock: 300263SA20CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA20C-B is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Voltage - Reverse Standoff (Typ): 20V
• Voltage - Breakdown (Min): 22.2V
• Bidirectional Channels: 1
• Type: Zener
• Mounting Type: Through Hole
• Package / Case: DO-204AC (DO-15)

Allowable Variation Parameters:

• Voltage - Clamping (Max) @ Ipp: Substitute may exceed the original specification
• Current - Peak Pulse (10/1000µs): Substitute may exceed the original specification
• Power - Peak Pulse: Substitute may equal or exceed the original specification
• Operating Temperature Range: Substitute may equal or exceed the original specification
• Product Status: Active status preferred for ongoing availability
• RoHS Compliance: Substitute must maintain or improve compliance level

The SA20CA meets all mandatory matching parameters and provides equivalent or superior performance in allowable variation parameters, qualifying it as a direct substitute for the SA20C-B.

Parameter Comparison

Engineering Selection Recommendations

SA20CA as Primary Substitute:

The SA20CA is qualified as a direct substitute for the SA20C-B based on the following engineering criteria:

1. Electrical Equivalence: Both devices maintain identical reverse standoff voltage (20V) and breakdown voltage (22.2V), ensuring circuit protection thresholds remain unchanged.

2. Package Compatibility: Both components utilize the DO-204AC (DO-15) axial through-hole package, permitting direct board-level replacement without layout modification.

3. Performance Enhancement: The SA20CA provides superior clamping voltage (43V vs. 32.4V) and peak pulse current (16A vs. 15.7A) ratings, delivering enhanced transient suppression capability within the same thermal and power envelope.

4. Product Status: The SA20CA maintains active product status with substantial inventory availability (300,200 pcs), addressing supply chain continuity concerns associated with the obsolete SA20C-B.

5. Compliance Certification: The SA20CA achieves ROHS3 compliance, meeting current regulatory requirements and supporting long-term design sustainability.

6. Temperature Consideration: The SA20CA operates across -55 to 175°C, compared to the SA20C-B range of -65 to 175°C. Applications requiring operation below -55°C require evaluation against specific system requirements.

Frequently Asked Questions (FAQ)

Q: Can the SA20CA be used as a direct replacement for the SA20C-B in existing designs?

A: Yes. The SA20CA is electrically and mechanically compatible with the SA20C-B. Both devices share identical reverse standoff voltage, breakdown voltage, and DO-204AC package specifications. Direct board-level substitution is permissible without circuit redesign.

Q: What is the significance of the higher clamping voltage in the SA20CA?

A: The SA20CA exhibits a maximum clamping voltage of 43V compared to the SA20C-B at 32.4V. This represents enhanced transient suppression performance. The higher clamping voltage does not compromise circuit protection; it indicates the substitute device can handle transient events with greater margin while maintaining the same 20V standoff threshold.

Q: Are there temperature range limitations when substituting the SA20CA?

A: The SA20CA operates from -55 to 175°C, whereas the SA20C-B operates from -65 to 175°C. Applications requiring operation below -55°C must verify system requirements against the substitute device's lower temperature limit. Most commercial and industrial applications operate within the SA20CA temperature range.

Q: Does the SA20CA packaging differ from the SA20C-B?

A: No. Both devices are supplied in DO-204AC (DO-15) axial through-hole packages. The SA20CA is available in Tape & Reel (TR) packaging format, which is standard for automated assembly processes. The component footprint and pinout remain identical.

Q: What compliance certifications apply to the SA20CA?

A: The SA20CA is ROHS3 compliant and REACH unaffected. These certifications exceed the RoHS compliance of the SA20C-B, ensuring the substitute meets current environmental and regulatory standards for electronic components.

Q: Is the SA20CA suitable for telecom applications?

A: The SA20CA is classified for general-purpose applications. The SA20C-B was specifically designated for telecom use. Both devices provide equivalent transient voltage suppression functionality. Application-specific requirements should be evaluated against the substitute device's general-purpose rating and electrical specifications.