TPSMA18HE3/5AT Equivalent & Substitute Parts

Part Overview

The TPSMA18HE3/5AT is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for surface mount applications in the DO-214AC (SMA) package and provides transient voltage protection with a 14.5V reverse standoff voltage and 26.5V maximum clamping voltage. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Substiute Parts

TPSMA18HE3/5AT

Vishay General Semiconductor - Diodes DivisionIn Stock: 921TPSMA18HE3/5AT Datasheet

Current PartRFQ

PTVS16VS1UR,115

Nexperia USA Inc.In Stock: 18739PTVS16VS1UR,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPSMA18HE3/5AT is determined by the following critical electrical and mechanical parameters:

• Unidirectional TVS diode topology with single channel configuration
• Voltage rating compatibility: Reverse standoff voltage within acceptable tolerance, clamping voltage within specified range
• Peak pulse current capability: Minimum 15.1A at 10/1000µs pulse width
• Power dissipation: 400W peak pulse rating
• Surface mount packaging suitable for automated assembly
• Automotive grade qualification with AEC-Q101 certification
• Operating temperature range compatibility

The PTVS16VS1UR,115 meets these substitution criteria through equivalent electrical performance and automotive qualification, though with a different package form factor (SOD-123W versus DO-214AC).

Parameter Comparison

Engineering Selection Recommendations

The PTVS16VS1UR,115 serves as a functional equivalent to the obsolete TPSMA18HE3/5AT based on the following engineering criteria:

Both devices maintain automotive grade classification with AEC-Q101 qualification, ensuring compliance with automotive reliability standards. The electrical parameters are closely matched: peak pulse current ratings differ by only 0.3A (15.1A versus 15.4A), clamping voltages are within 0.5V (26.5V versus 26V), and both devices deliver 400W peak pulse power dissipation. Both components are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1).

The primary design consideration is the package form factor change from DO-214AC (SMA) to SOD-123W. This transition requires PCB layout modification and may affect thermal management characteristics due to different package geometries. The substitute part is currently in active production status, ensuring long-term availability and supply chain stability compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can the PTVS16VS1UR,115 be used as a direct drop-in replacement for the TPSMA18HE3/5AT?

A: Electrical substitution is valid based on equivalent voltage ratings, peak pulse current capability, and power dissipation. However, the package change from DO-214AC to SOD-123W requires PCB layout modification. Direct socket compatibility is not possible without redesign.

Q: What are the key electrical differences between these two TVS diodes?

A: The reverse standoff voltage differs by 1.5V (14.5V versus 16V), and the breakdown voltage minimum differs by 1.6V (16.2V versus 17.8V). The clamping voltage is nearly identical (26.5V versus 26V). Peak pulse current ratings are equivalent within 0.3A. These differences are within acceptable tolerance for most transient protection applications.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the TPSMA18HE3/5AT and PTVS16VS1UR,115 carry automotive grade classification and AEC-Q101 qualification, meeting automotive reliability and quality standards.

Q: What is the impact of the package change on circuit design?

A: The SOD-123W package (PTVS16VS1UR,115) has different footprint dimensions and thermal characteristics compared to the DO-214AC package (TPSMA18HE3/5AT). PCB layout must be updated to accommodate the new package geometry. Thermal performance may differ due to package construction variations.

Q: Is the PTVS16VS1UR,115 available in the same packaging format?

A: No. The PTVS16VS1UR,115 is supplied in Tape & Reel (TR) format in the SOD-123W package, whereas the TPSMA18HE3/5AT was available in DO-214AC (SMA) packaging. Procurement and assembly processes may require adjustment.