TPSMA18AHE3_A/I Equivalent & Substitute Parts

Part Overview

The TPSMA18AHE3_A/I 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 operates across an automotive temperature range of -65°C to 185°C. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing design support and procurement.

Substiute Parts

TPSMA18AHE3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1008TPSMA18AHE3_A/I Datasheet

Current PartRFQ

TPSMA18AHE3_B/I

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

DirectRFQ

SMAJP4KE18A-TP

Micro Commercial CoIn Stock: 5523SMAJP4KE18A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPSMA18AHE3_A/I is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 15.3V
• Voltage - Breakdown (Min): 17.1V
• Voltage - Clamping (Max) @ Ipp: 25.5V
• Current - Peak Pulse (10/1000µs): 15.9A minimum
• Power - Peak Pulse: 400W
• Package / Case: DO-214AC, SMA
• Mounting Type: Surface Mount
• Unidirectional Channels: 1

Substitute parts must maintain electrical equivalence across these parameters within acceptable engineering tolerances. The identified substitutes are grouped as follows:

Direct Manufacturer Equivalent: TPSMA18AHE3_B/I is a direct equivalent from the same manufacturer with identical electrical specifications and differs only in packaging format (Tape & Reel).

Manufacturer-Recommended Substitute: SMAJP4KE18A-TP from Micro Commercial Co provides electrical equivalence with minor variations in peak pulse current (16.1A vs. 15.9A) and operating temperature range (-55°C ~ 175°C vs. -65°C ~ 185°C).

Parameter Comparison

Engineering Selection Recommendations

TPSMA18AHE3_B/I is the preferred substitute for the obsolete TPSMA18AHE3_A/I. This part maintains identical electrical specifications, automotive grade qualification, and AEC-Q101 certification. The only difference is packaging format (Tape & Reel vs. bulk), which does not affect electrical performance. This part is currently in active production status with 1117 units in stock.

SMAJP4KE18A-TP is an alternative substitute when TPSMA18AHE3_B/I is unavailable. This part meets all critical electrical parameters with equivalent clamping voltage and power dissipation. However, it is classified as General Purpose grade rather than Automotive grade and lacks AEC-Q101 qualification. The operating temperature range is narrower (-55°C ~ 175°C vs. -65°C ~ 185°C). Selection of this part should be evaluated against specific application temperature requirements and automotive compliance mandates.

Frequently Asked Questions (FAQ)

Q: Can TPSMA18AHE3_B/I be used as a direct replacement for TPSMA18AHE3_A/I?

A: Yes. TPSMA18AHE3_B/I is electrically and functionally identical to TPSMA18AHE3_A/I. Both parts share the same voltage ratings (15.3V standoff, 25.5V clamping), current specifications (15.9A peak pulse), and thermal operating range (-65°C ~ 185°C). The difference is packaging format only.

Q: What are the key differences between TPSMA18AHE3_B/I and SMAJP4KE18A-TP?

A: Both parts provide equivalent clamping voltage (25.5V) and power dissipation (400W). TPSMA18AHE3_B/I maintains automotive grade and AEC-Q101 qualification, while SMAJP4KE18A-TP is general purpose grade without automotive certification. TPSMA18AHE3_B/I operates across -65°C ~ 185°C; SMAJP4KE18A-TP operates across -55°C ~ 175°C.

Q: Are the DO-214AC (SMA) and DO-214AC (SMAJ) packages interchangeable?

A: Both packages are DO-214AC surface mount packages. Physical dimensions and PCB footprints are compatible. Electrical performance is equivalent for this application.

Q: Why is TPSMA18AHE3_A/I listed as obsolete?

A: The part is no longer in active production. TPSMA18AHE3_B/I is the active production equivalent from the same manufacturer and series.

Q: Should SMAJP4KE18A-TP be used in automotive applications?

A: SMAJP4KE18A-TP is classified as general purpose grade and does not carry AEC-Q101 automotive qualification. Use in automotive applications should be evaluated against specific design requirements and compliance mandates. TPSMA18AHE3_B/I is the recommended choice for automotive applications.