TPSMA18HE3_A/I Equivalent & Substitute Parts

Part Overview

The TPSMA18HE3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for surface mount applications in DO-214AC (SMA) packaging. This component provides transient voltage protection with a 14.5V reverse standoff voltage and 26.5V maximum clamping voltage at peak pulse current. The part is classified as Obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

Substiute Parts

TPSMA18HE3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1083TPSMA18HE3_A/I Datasheet

Current PartRFQ

TPSMA18AHE3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1177TPSMA18AHE3_B/I Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TPSMA18HE3_A/I is determined by strict alignment of the following electrical and mechanical parameters:

• Unidirectional channel configuration (1 channel required)
• Voltage - Reverse Standoff tolerance range (14.5V ±tolerance)
• Voltage - Clamping specification (26.5V maximum @ Ipp)
• Current - Peak Pulse rating (15.1A minimum)
• Power - Peak Pulse dissipation (400W)
• Operating temperature range (-65°C to 185°C minimum)
• Package type (DO-214AC / SMA surface mount)
• Automotive grade classification
• AEC-Q101 qualification
• RoHS3 compliance

The TPSMA18AHE3_B/I meets these substitution criteria as an active equivalent part from the same manufacturer and PAR® series, with compatible electrical performance within the specified parameter envelope.

Parameter Comparison

Engineering Selection Recommendations

The TPSMA18AHE3_B/I is the qualified substitute for the obsolete TPSMA18HE3_A/I. Selection is based on:

• Active product status ensuring continued availability and manufacturing support
• Identical automotive grade and AEC-Q101 qualification maintaining compliance requirements
• Identical RoHS3 compliance status preserving regulatory alignment
• Identical package type (DO-214AC / SMA) enabling direct PCB footprint compatibility
• Electrical parameters within acceptable tolerance for TVS diode applications, with clamping voltage 1V lower and peak pulse current 0.8A higher, both favorable for transient suppression performance
• Same operating temperature range and power dissipation rating

Frequently Asked Questions (FAQ)

Q: Can TPSMA18AHE3_B/I be used as a direct replacement for TPSMA18HE3_A/I?

A: Yes. Both parts share identical package type (DO-214AC / SMA), automotive grade, AEC-Q101 qualification, and operating temperature range. Electrical parameters are compatible within TVS diode application requirements.

Q: What is the difference in clamping voltage between these parts?

A: The TPSMA18HE3_A/I has a maximum clamping voltage of 26.5V, while the TPSMA18AHE3_B/I is rated at 25.5V. This 1V difference is within acceptable tolerance for transient suppression circuits and does not prevent substitution.

Q: Are there packaging differences between these parts?

A: No. Both parts use identical DO-214AC (SMA) surface mount packaging with the same footprint and mounting requirements.

Q: Why is the original part listed as Obsolete?

A: The TPSMA18HE3_A/I is classified as Obsolete by the manufacturer. The TPSMA18AHE3_B/I is the active equivalent from the same PAR® series, ensuring continued supply and manufacturing support.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both parts are automotive grade and hold AEC-Q101 qualification, meeting automotive industry reliability and quality standards.

Q: Is RoHS compliance identical between these parts?

A: Yes. Both parts are ROHS3 compliant, maintaining identical regulatory compliance status.