TPSMA9.1AHE3_A/I Equivalent & Substitute Parts

Part Overview

The TPSMA9.1AHE3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for surface mount applications in the DO-214AC (SMA) package. This component provides transient overvoltage protection with a 7.78V reverse standoff voltage and 13V maximum clamping voltage at peak pulse current. The part is classified as Automotive grade with AEC-Q101 qualification and operates across the temperature range of -65°C to 185°C (TJ).

The TPSMA9.1AHE3_A/I is currently listed as Obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring this specific voltage suppression performance.

Substiute Parts

TPSMA9.1AHE3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 865TPSMA9.1AHE3_A/I Datasheet

Current PartRFQ

TPSMA9.1AHE3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1001TPSMA9.1AHE3_B/I Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPSMA9.1AHE3_A/I is determined by strict equivalence across the following critical parameters:

• Electrical Performance: Reverse standoff voltage (7.78V typical), breakdown voltage minimum (8.65V), clamping voltage maximum at peak pulse current (13V), and peak pulse current rating (29.9A at 10/1000µs)
• Power Dissipation: Peak pulse power rating (400W)
• Package Compatibility: DO-214AC (SMA) surface mount package
• Thermal Performance: Operating temperature range (-65°C to 185°C TJ)
• Regulatory Compliance: Automotive grade, AEC-Q101 qualification, ROHS3 compliance, and REACH unaffected status

The substitute part TPSMA9.1AHE3_B/I maintains identical electrical specifications and package requirements. The primary distinction is packaging format: the original part uses standard packaging, while the substitute is supplied in Tape & Reel (TR) format. Additionally, the substitute part maintains Active product status, ensuring ongoing manufacturer support and supply availability.

Parameter Comparison

Engineering Selection Recommendations

The TPSMA9.1AHE3_B/I is a direct functional equivalent to the TPSMA9.1AHE3_A/I. All critical electrical parameters, thermal specifications, and regulatory certifications are identical. The substitute part is manufactured by the same supplier and maintains the same automotive-grade qualification and AEC-Q101 compliance.

The primary advantage of selecting TPSMA9.1AHE3_B/I is its Active product status, which ensures continued manufacturer support, documented supply chain availability, and ongoing technical documentation maintenance. The Tape & Reel packaging format is standard for high-volume production environments and is compatible with automated assembly processes.

For applications currently using TPSMA9.1AHE3_A/I, direct substitution with TPSMA9.1AHE3_B/I requires no circuit redesign, PCB layout modification, or thermal management changes. The component footprint, electrical performance, and reliability characteristics remain unchanged.

Frequently Asked Questions (FAQ)

Q: Can TPSMA9.1AHE3_B/I be used as a direct replacement for TPSMA9.1AHE3_A/I in existing designs?

A: Yes. The substitute part maintains identical electrical specifications, package dimensions, thermal performance, and regulatory compliance. No design modifications are required for direct substitution.

Q: What is the difference between the standard packaging and Tape & Reel (TR) format?

A: Both formats contain the same component with identical electrical and mechanical properties. Tape & Reel packaging is optimized for automated pick-and-place assembly in production environments, while standard packaging is typically used for manual assembly or lower-volume applications. The component itself is functionally identical.

Q: Are there any thermal or reliability differences between these parts?

A: No. Both parts operate across the same temperature range (-65°C to 185°C TJ) and maintain identical power dissipation ratings (400W peak pulse). Reliability and thermal characteristics are equivalent.

Q: Why is the original part listed as Obsolete?

A: The TPSMA9.1AHE3_A/I has been superseded by the TPSMA9.1AHE3_B/I in the manufacturer's product line. The substitute part is the current active offering and is recommended for new designs and ongoing production.

Q: Are both parts AEC-Q101 qualified?

A: Yes. Both TPSMA9.1AHE3_A/I and TPSMA9.1AHE3_B/I carry AEC-Q101 qualification and are suitable for automotive applications requiring this certification.

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

A: Substitution is determined by matching reverse standoff voltage (7.78V), breakdown voltage (8.65V minimum), clamping voltage (13V maximum), peak pulse current (29.9A), power rating (400W), package type (DO-214AC SMA), operating temperature range (-65°C to 185°C), and regulatory compliance (Automotive grade, AEC-Q101, ROHS3, REACH unaffected).