SA20CA Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The SA20CA is an active Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage transient protection in through-hole applications. This bidirectional Zener-type TVS diode operates with a 20V reverse standoff voltage and provides 32.4V maximum clamping voltage at peak pulse current. The component is packaged in DO-204AC (DO-15) axial configuration and is ROHS3 compliant with unlimited moisture sensitivity rating. Substitute parts are identified when electrical parameters and mechanical specifications align with the original component's functional requirements.

Substiute Parts

SA20CA

Littelfuse Inc.In Stock: 300308SA20CA Datasheet

Current PartRFQ

SA20CA-TP

Micro Commercial CoIn Stock: 5709SA20CA-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA20CA are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 20V
• Voltage - Breakdown (Min): 22.2V
• Voltage - Clamping (Max) @ Ipp: 32.4V
• Current - Peak Pulse (10/1000µs): 15.7A
• Power - Peak Pulse: 500W
• Type: Zener
• Bidirectional Channels: 1
• Mounting Type: Through Hole
• Package / Case: DO-204AC or DO-15 Axial

Compliance Requirements:

• Product Status: Active
• RoHS Status: ROHS3 Compliant
• Operating Temperature Range: -55°C to 175°C

The SA20CA-TP qualifies as a direct substitute based on complete alignment of all electrical parameters, device type, channel configuration, mounting method, and package specification.

Parameter Comparison

Engineering Selection Recommendations

Both the SA20CA and SA20CA-TP are active products with ROHS3 compliance and identical electrical specifications. Selection between these components should be based on:

Availability and Lead Time: The SA20CA-TP (Micro Commercial Co) offers 5603 units in stock, while the SA20CA (Littelfuse) maintains 300200 units in inventory. Procurement decisions should reflect project timeline requirements and supply chain considerations.

Manufacturer Certification: Both components carry ROHS3 compliance and EAR99 export classification. The SA20CA-TP includes REACH Unaffected status in addition to RoHS compliance.

Package Specification: The SA20CA-TP is supplied in DO-15 package configuration, while the SA20CA is available in DO-204AC (DO-15) specification. Both are mechanically and electrically compatible axial through-hole packages.

Temperature Rating Reference: The SA20CA specifies junction temperature (TJ) range, while SA20CA-TP specifies ambient temperature (TA) range. Both support the full -55°C to 175°C operational envelope required for general-purpose TVS applications.

Frequently Asked Questions (FAQ)

Q: Can SA20CA-TP be used as a direct replacement for SA20CA?

A: Yes. The SA20CA-TP meets all electrical parameter requirements, device type specifications, and mechanical package standards. Both components are Zener-type bidirectional TVS diodes with identical voltage ratings, peak pulse current, and power dissipation specifications.

Q: Are there package compatibility concerns between DO-204AC and DO-15?

A: No. Both designations refer to the same axial through-hole package configuration. DO-204AC is the formal IEC designation; DO-15 is the legacy JEDEC designation. The components are mechanically and electrically interchangeable in PCB layouts designed for axial through-hole mounting.

Q: What is the difference between TJ and TA temperature specifications?

A: TJ (junction temperature) and TA (ambient temperature) represent different measurement reference points. Both components support operation across the -55°C to 175°C range. The choice between them does not affect substitution eligibility for general-purpose applications.

Q: Do both parts meet RoHS compliance requirements?

A: Yes. Both SA20CA and SA20CA-TP are ROHS3 compliant. The SA20CA-TP additionally carries REACH Unaffected certification.

Q: Are there any electrical performance differences between the substitute parts?

A: No. Both components share identical electrical specifications: 20V reverse standoff voltage, 22.2V minimum breakdown voltage, 32.4V maximum clamping voltage, 15.7A peak pulse current, and 500W peak pulse power rating.