SA180-B Equivalent & Substitute Parts

Part Overview

The SA180-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This component features a 180V reverse standoff voltage with a 289V maximum clamping voltage and 1.7A peak pulse current capability in a through-hole DO-204AC (DO-15) axial package. The SA180-B is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure ongoing component availability for new production and field service applications.

Substiute Parts

SA180-B

Littelfuse Inc.In Stock: 864SA180-B Datasheet

Current PartRFQ

SA180A

Littelfuse Inc.In Stock: 1080SA180A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA180-B is determined by electrical and mechanical parameter equivalence within the TVS diode category. The critical parameters governing substitution are:

Electrical Parameters:

• Voltage - Reverse Standoff (Typ): 180V
• Voltage - Breakdown (Min): 200V
• Voltage - Clamping (Max) @ Ipp: 289V
• Current - Peak Pulse (10/1000µs): 1.7A
• Power - Peak Pulse: 500W

Mechanical Parameters:

• Package / Case: DO-204AC (DO-15)
• Mounting Type: Through Hole
• Unidirectional Channels: 1

The SA180-A meets all electrical and mechanical equivalence criteria, maintaining identical voltage ratings, current handling, power dissipation, and physical form factor. The primary distinction is product status and packaging configuration.

Parameter Comparison

Engineering Selection Recommendations

The SA180-A is a direct electrical and mechanical equivalent to the SA180-B, with identical voltage ratings, current handling, power dissipation, and physical package specifications. The SA180-A is classified as an active product with current manufacturing status, ensuring long-term availability and supply chain continuity.

The SA180-A carries ROHS3 compliance certification, representing current regulatory standards, whereas the SA180-B carries legacy RoHS compliance. Both components are RoHS compliant and suitable for applications requiring environmental compliance.

The operating temperature range of the SA180-A extends from -55°C to 175°C (TJ), compared to the SA180-B range of -65°C to 175°C (TJ). Applications requiring operation below -55°C require verification of thermal performance requirements.

The SA180-A is supplied in Tape & Reel (TR) packaging, facilitating automated assembly processes, whereas the SA180-B packaging configuration is not specified. Both components utilize the identical DO-204AC (DO-15) axial through-hole package.

Frequently Asked Questions (FAQ)

Q: Can the SA180-A directly replace the SA180-B in existing designs?

A: Yes. The SA180-A provides electrical and mechanical equivalence across all critical parameters: 180V reverse standoff voltage, 289V clamping voltage, 1.7A peak pulse current, 500W peak pulse power, and DO-204AC (DO-15) through-hole package configuration. No circuit modifications are required.

Q: What is the primary reason for substituting the SA180-B?

A: The SA180-B is classified as obsolete. The SA180-A is an active product with current manufacturing status, ensuring component availability for new production and field service applications.

Q: Are there compliance differences between the SA180-B and SA180-A?

A: Both components are RoHS compliant. The SA180-A carries ROHS3 certification, representing current regulatory standards. Both components are suitable for applications requiring environmental compliance.

Q: Does the operating temperature range difference affect substitution?

A: The SA180-A operates from -55°C to 175°C (TJ), while the SA180-B operates from -65°C to 175°C (TJ). Applications requiring operation below -55°C must evaluate whether the reduced lower temperature limit impacts thermal performance requirements.

Q: Are the packages identical?

A: Yes. Both the SA180-B and SA180-A utilize the DO-204AC (DO-15) axial through-hole package. The SA180-A is supplied in Tape & Reel (TR) packaging format, which is standard for automated assembly processes.

Q: What are the key electrical parameters that determine substitution?

A: Substitution is determined by equivalence in voltage ratings (180V reverse standoff, 200V breakdown minimum, 289V clamping maximum), current handling (1.7A peak pulse), and power dissipation (500W peak pulse). The SA180-A matches all these parameters.