TPSMC18AHE3_A/I Equivalent & Substitute Parts

Part Overview

The TPSMC18AHE3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, part of the PAR® series. This surface mount component is designed for transient voltage protection in electronic circuits with a 15.3V reverse standoff voltage and 25.2V maximum clamping voltage. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical equivalence across voltage ratings, peak pulse current, and power dissipation while accommodating packaging and temperature range variations.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	15.3	V
Voltage - Breakdown (Min)	17.1	V
Voltage - Clamping (Max) @ Ipp	25.2	V
Current - Peak Pulse (10/1000µs)	59.5	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-65 to 185	°C (TJ)
Mounting Type	Surface Mount	-
Package / Case	DO-214AB, SMC	-
Type	Zener	-
Unidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitution eligibility for the TPSMC18AHE3_A/I is determined by strict equivalence across the following electrical parameters:

Voltage - Reverse Standoff (Typ): 15.3V
Voltage - Breakdown (Min): 17.1V
Voltage - Clamping (Max) @ Ipp: 25.2V (±tolerance acceptable)
Current - Peak Pulse (10/1000µs): 59.5A (±tolerance acceptable)
Power - Peak Pulse: 1500W
Package / Case: DO-214AB, SMC (surface mount compatibility required)
Unidirectional Channels: 1

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (Vishay & Littelfuse): Parts maintaining identical voltage ratings, peak pulse current within 1A tolerance, and operating temperature ranges suitable for the application. These include 1.5SMC18A-E3/9AT, 1.5SMC18A-M3/57T, SM15T18A-M3/9AT, TPSMC18AHE3_B/I, SZ1.5SMC18AT3G, and TPSMC18A.

Category B - Functional Equivalents with Parameter Variations: Parts meeting core voltage and power requirements but with measurable differences in clamping voltage, peak pulse current specifications, or operating temperature ranges. These include SM15T18AY (STMicroelectronics) and SMCJ1.5KE18A-TP (Micro Commercial Co).

Parameter Comparison

Part Number	Manufacturer	VWM (V)	VBR (V)	VC (V)	Ipp (A)	Ppk (W)	Temp Range (°C)	Status	AEC-Q101
TPSMC18AHE3_A/I	Vishay	15.3	17.1	25.2	59.5	1500	-65 to 185	Obsolete	Yes
1.5SMC18A-E3/9AT	Vishay	15.3	17.1	25.2	59.5	1500	-65 to 150	Active	No
1.5SMC18A-M3/57T	Vishay	15.3	17.1	25.2	59.5	1500	-65 to 150	Active	No
SM15T18A-M3/9AT	Vishay	15.3	17.1	25.2	59.5	1500	-65 to 150	Active	No
TPSMC18AHE3_B/I	Vishay	15.3	17.1	25.2	59.5	1500	-65 to 185	Active	Yes
SM15T18AY	STMicroelectronics	15.3	17.1	32.5	308 (8/20µs)	1500	-40 to 150	Active	Yes
SMCJ1.5KE18A-TP	Micro Commercial Co	15.3	17.1	25.5	60.3	1500	-55 to 175	Active	No
SZ1.5SMC18AT3G	Littelfuse	15.3	17.1	25.2	59.5	1500	-65 to 150	Active	Yes
TPSMC18A	Littelfuse	15.3	17.1	25.2	60.3	1500	-55 to 150	Active	Yes

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

TPSMC18AHE3_B/I is the preferred direct substitute. It maintains identical electrical specifications, the same PAR® series designation, automotive-grade qualification (AEC-Q101), and extends the operating temperature range to -65°C to 185°C, matching the original part. Product status is active with 715 units in stock.

SZ1.5SMC18AT3G (Littelfuse) provides electrical equivalence with AEC-Q101 qualification and automotive-grade designation. Operating temperature range is -65°C to 150°C. This part is active with 9540 units in stock, offering superior availability.

Secondary Substitutes (Electrical Equivalence with Temperature Constraints):

1.5SMC18A-E3/9AT, 1.5SMC18A-M3/57T, and SM15T18A-M3/9AT are Vishay active parts with identical voltage and current specifications. Operating temperature range is limited to -65°C to 150°C. These parts are suitable for applications not requiring the extended upper temperature range of the original part.

TPSMC18A (Littelfuse) maintains electrical equivalence with AEC-Q101 qualification. Operating temperature range is -55°C to 150°C. Peak pulse current is 60.3A, within acceptable tolerance.

Conditional Substitutes (Parameter Variations Requiring Application Review):

SM15T18AY (STMicroelectronics) has AEC-Q101 qualification but exhibits a higher clamping voltage (32.5V vs. 25.2V) and significantly higher peak pulse current specification (308A at 8/20µs vs. 59.5A at 10/1000µs). Operating temperature minimum is -40°C. This part is suitable only for applications where higher clamping voltage and different pulse waveform specifications are acceptable.

SMCJ1.5KE18A-TP (Micro Commercial Co) has clamping voltage of 25.5V and peak pulse current of 60.3A, both within tight tolerance. Operating temperature range is -55°C to 175°C. This part lacks AEC-Q101 qualification and automotive-grade designation.

Frequently Asked Questions (FAQ)

Q: Can I use SM15T18AY as a direct replacement for TPSMC18AHE3_A/I?

A: SM15T18AY is not a direct replacement. While it maintains the 15.3V reverse standoff voltage and 1500W peak pulse power, the clamping voltage is 32.5V compared to 25.2V in the original part. The peak pulse current specification uses a different waveform (8/20µs vs. 10/1000µs) with a significantly higher value (308A). This part is suitable only if your circuit design accommodates higher clamping voltage and the different pulse waveform specification.

Q: What is the difference between TPSMC18AHE3_A/I and TPSMC18AHE3_B/I?

A: Both parts are Vishay PAR® series TVS diodes with identical electrical specifications (15.3V VWM, 25.2V clamping voltage, 59.5A peak pulse current, 1500W power). The primary difference is product status: TPSMC18AHE3_A/I is obsolete, while TPSMC18AHE3_B/I is active. Both have AEC-Q101 qualification and automotive-grade designation with -65°C to 185°C operating temperature range.

Q: Are all substitute parts qualified to AEC-Q101?

A: No. AEC-Q101 qualification is present in TPSMC18AHE3_B/I, SZ1.5SMC18AT3G, SM15T18AY, and TPSMC18A. The Vishay 1.5SMC series parts (1.5SMC18A-E3/9AT, 1.5SMC18A-M3/57T, SM15T18A-M3/9AT) and SMCJ1.5KE18A-TP do not carry AEC-Q101 qualification. For automotive applications requiring AEC-Q101 compliance, select from the qualified parts.

Q: What is the temperature range limitation I should consider?

A: The original TPSMC18AHE3_A/I operates from -65°C to 185°C. Most substitute parts limit the upper temperature to 150°C, except TPSMC18AHE3_B/I (185°C) and SMCJ1.5KE18A-TP (175°C). If your application requires operation above 150°C, use TPSMC18AHE3_B/I. If the minimum temperature is above -40°C, SM15T18AY is acceptable.

Q: Does packaging differ between substitute parts?

A: All substitute parts use DO-214AB (SMC) surface mount packaging, maintaining mechanical compatibility with the original part. Packaging options vary by supplier (Tape & Reel configurations differ), but the physical component package remains consistent across all listed substitutes.

Q: Which substitute has the best inventory availability?

A: SZ1.5SMC18AT3G (Littelfuse) has the highest inventory with 9540 units in stock. SMCJ1.5KE18A-TP (Micro Commercial Co) has 4310 units. TPSMC18A (Littelfuse) has 3180 units. TPSMC18AHE3_B/I has 715 units.

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