SA180 Equivalent & Substitute Parts

Part Overview

The SA180 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. It features a 180V reverse standoff voltage with a 303.45V maximum clamping voltage and 1.7A peak pulse current capability in a through-hole DO-204AC (DO-15) axial package.

The SA180 is classified as obsolete. 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

SA180

Littelfuse Inc.In Stock: 1139SA180 Datasheet

Current PartRFQ

SA180A

Littelfuse Inc.In Stock: 1080SA180A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA180 is based on the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff: 180V (primary protection threshold)
• Voltage - Clamping (Max) @ Ipp: Must remain within acceptable operating range for protected circuits
• Current - Peak Pulse (10/1000µs): 1.7A (transient energy handling capability)
• Power - Peak Pulse: 500W (thermal dissipation capacity)
• Mounting Type: Through Hole (mechanical compatibility)
• Package / Case: DO-204AC, DO-15, Axial (board-level fit and assembly compatibility)
• Operating Temperature Range: -55°C to 175°C (environmental suitability)
• RoHS Compliance: ROHS3 Compliant (regulatory requirement)

The SA180A qualifies as a direct substitute based on matching all critical parameters within acceptable engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

The SA180A is the qualified substitute for the SA180. Both components are manufactured by Littelfuse Inc. and share identical electrical ratings for reverse standoff voltage, peak pulse current, and power dissipation. Both meet ROHS3 compliance requirements and feature unlimited moisture sensitivity classification.

The SA180A differs in clamping voltage specification (289V versus 303.45V) and breakdown voltage minimum (200V versus 194.85V), representing tighter performance tolerances. The SA180A is currently in active production status, ensuring supply chain availability and long-term support.

Selection of the SA180A is appropriate for applications where the SA180 is no longer available and where the specified clamping voltage and breakdown characteristics are compatible with circuit protection requirements.

Frequently Asked Questions (FAQ)

Q: Can the SA180A be used as a direct replacement for the SA180?

A: Yes. Both components share identical reverse standoff voltage (180V), peak pulse current (1.7A), and power dissipation (500W) ratings. The SA180A features a lower maximum clamping voltage (289V versus 303.45V), which represents improved performance within the same protection class. Both use the DO-204AC through-hole axial package.

Q: What is the primary difference between the SA180 and SA180A?

A: The SA180A has a lower maximum clamping voltage (289V) compared to the SA180 (303.45V), and a higher minimum breakdown voltage (200V versus 194.85V). These differences indicate tighter manufacturing tolerances in the SA180A. The SA180A is in active production, while the SA180 is obsolete.

Q: Are there packaging differences between these parts?

A: No. Both the SA180 and SA180A use the DO-204AC (DO-15) axial through-hole package. They are mechanically and electrically compatible for board-level installation.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the SA180 and SA180A are ROHS3 compliant and carry unlimited moisture sensitivity classification (MSL 1), meeting current environmental and regulatory standards.

Q: Which part should be selected for new designs?

A: The SA180A should be selected for new designs. It is in active production status and offers tighter performance specifications than the obsolete SA180.