SA9.0 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA9.0 is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole component features a 9V reverse standoff voltage with a 16.17V maximum clamping voltage and 33.1A peak pulse current capability in a DO-204AC (DO-15) axial package.

The SA9.0 is classified as obsolete. Identifying equivalent 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

SA9.0

Littelfuse Inc.In Stock: 1005SA9.0 Datasheet

Current PartRFQ

SA9.0A

Taiwan Semiconductor CorporationIn Stock: 300450SA9.0A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA9.0 is determined by the following critical electrical and mechanical parameters:

• Voltage Rating Compatibility: Reverse standoff voltage of 9V and breakdown voltage minimum of 9.5V
• Clamping Voltage Performance: Maximum clamping voltage at peak pulse current must be within acceptable operational limits
• Peak Pulse Current Capability: Minimum 33.1A at 10/1000µs pulse duration
• Power Dissipation: 500W peak pulse power rating
• Package Compatibility: DO-204AC (DO-15) axial through-hole configuration
• Temperature Range: Operating range of -55°C to 175°C (TJ)
• Regulatory Compliance: ROHS3 compliance and MSL rating

The SA9.0A from Taiwan Semiconductor Corporation meets all substitution criteria within these defined parameters.

Parameter Comparison

Engineering Selection Recommendations

The SA9.0A from Taiwan Semiconductor Corporation is a direct substitute for the obsolete SA9.0. Both components share identical reverse standoff voltage (9V), equivalent peak pulse current ratings (33.1A vs. 34A), and matching power dissipation (500W). The SA9.0A demonstrates superior clamping voltage performance at 15.4V compared to the SA9.0 at 16.17V, providing enhanced transient suppression characteristics.

The SA9.0A maintains full compliance with ROHS3 regulations and carries an active product status, ensuring long-term supply chain availability and manufacturing support. Both components operate across the identical temperature range (-55°C to 175°C) and utilize the same DO-204AC axial through-hole package, enabling direct mechanical and electrical interchangeability without circuit board redesign.

Frequently Asked Questions (FAQ)

Q: Can the SA9.0A be used as a direct replacement for the SA9.0 in existing designs?

A: Yes. The SA9.0A is electrically and mechanically compatible with the SA9.0. Both components feature identical 9V reverse standoff voltage, equivalent peak pulse current capability, matching 500W power dissipation, and the same DO-204AC axial through-hole package configuration. No circuit modifications are required.

Q: What is the difference in clamping voltage between the SA9.0 and SA9.0A?

A: The SA9.0 has a maximum clamping voltage of 16.17V at peak pulse current, while the SA9.0A clamps at 15.4V. The lower clamping voltage of the SA9.0A provides improved transient suppression performance in the same application space.

Q: Are both parts RoHS compliant?

A: Yes. Both the SA9.0 and SA9.0A are ROHS3 compliant and carry MSL rating 1 (Unlimited), meeting current environmental and regulatory requirements.

Q: Why is the SA9.0 listed as obsolete?

A: The SA9.0 has been discontinued by Littelfuse Inc. The SA9.0A from Taiwan Semiconductor Corporation is the recommended active substitute for ongoing production and repair applications.

Q: Do both parts operate across the same temperature range?

A: Yes. Both the SA9.0 and SA9.0A operate from -55°C to 175°C (TJ), ensuring thermal compatibility across all specified operating conditions.

Q: Is the DO-204AC package the same as DO-15?

A: Yes. DO-204AC and DO-15 refer to the same axial through-hole package configuration. Both designations are used interchangeably in component specifications.