SMAJ15A-TP Transient Voltage Suppressor Diode

Part Overview

The SMAJ15A-TP is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co in DO-214AC (SMA) surface mount package. This component provides transient overvoltage protection for general-purpose applications with a 15V reverse standoff voltage and 24.4V maximum clamping voltage at peak pulse current of 16.4A. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Alternative equivalent and substitute parts are necessary when the original SMAJ15A-TP becomes unavailable, when alternative packaging formats are required, or when sourcing from different manufacturers is preferred for supply chain optimization.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	15	V
Voltage - Breakdown (Min)	16.7	V
Voltage - Clamping (Max) @ Ipp	24.4	V
Current - Peak Pulse (10/1000µs)	16.4	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 175	°C
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMAJ15A-TP is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 15V
Voltage - Breakdown (Min): 16.7V
Voltage - Clamping (Max) @ Ipp: 24.4V
Current - Peak Pulse (10/1000µs): 16.4A
Power - Peak Pulse: 400W
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Type: Zener, Unidirectional

Direct substitutes maintain identical electrical specifications and package format. Packaging variations (Tape & Reel vs. Cut Tape) do not affect electrical compatibility. Similar parts listed below share the same reverse standoff voltage and package but differ in clamping voltage and peak pulse current specifications, making them suitable only for applications where higher transient energy absorption is acceptable.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	Product Status
SMAJ15A-TP	Micro Commercial Co	15V	24.4V	16.4A	400W	-55 to 175°C	DO-214AC (SMA)	Active
SMAJ15A	EVVO Semi	15V	24.4V	16.4A	400W	-65 to 150°C	SMA	Active
SMAJ15A-13-F	Diodes Incorporated	15V	24.4V	16.4A	400W	-55 to 150°C	SMA	Active
SMAJ15A-E3/61	Vishay General Semiconductor - Diodes Division	15V	24.4V	16.4A	400W	-55 to 150°C	DO-214AC (SMA)	Active
SMAJ15AHE3/61	Vishay General Semiconductor - Diodes Division	15V	24.4V	16.4A	400W	-55 to 150°C	DO-214AC (SMA)	Discontinued at DiGi Electronics
SM4T18AY	STMicroelectronics	15V	32.5V	71A (8/20µs)	400W	-55 to 150°C	SMA (DO-214AC)	Active
SMA6J15A-E3/5A	Vishay General Semiconductor - Diodes Division	15V	27.7V	123A (8/20µs)	4000W	-55 to 150°C	DO-214AC (SMA)	Active
SMAJ15A-TR	STMicroelectronics	15V	32.5V	71A (8/20µs)	400W	-55 to 150°C	SMA (DO-214AC)	Active

Engineering Selection Recommendations

Direct electrical equivalents with identical 24.4V clamping voltage and 16.4A peak pulse current are SMAJ15A (EVVO Semi), SMAJ15A-13-F (Diodes Incorporated), SMAJ15A-E3/61 (Vishay), and SMAJ15AHE3/61 (Vishay). All direct substitutes maintain ROHS3 compliance and MSL 1 rating. SMAJ15AHE3/61 is discontinued at DiGi Electronics and should be avoided for new designs unless existing inventory is available.

The EVVO Semi SMAJ15A variant operates at a reduced upper temperature limit of 150°C (junction) compared to the original 175°C (ambient), which may impact applications requiring extended thermal performance. The Diodes Incorporated SMAJ15A-13-F and Vishay SMAJ15A-E3/61 both operate to 150°C and are suitable for general-purpose substitution.

SM4T18AY (STMicroelectronics) and SMAJ15A-TR (STMicroelectronics) share the same 15V reverse standoff voltage but feature higher clamping voltage (32.5V) and significantly higher peak pulse current (71A at 8/20µs pulse). These parts are suitable only when higher transient energy absorption is required and the application circuit can tolerate the increased clamping voltage.

SMA6J15A-E3/5A (Vishay) is a higher-power variant with 27.7V clamping voltage and 123A peak pulse current (8/20µs), delivering 4000W peak pulse power. This part is appropriate only for applications requiring substantially higher transient protection capability.

Frequently Asked Questions (FAQ)

Q: Can SMAJ15A from EVVO Semi directly replace SMAJ15A-TP from Micro Commercial Co?

A: Yes, electrically. Both parts share identical voltage and current specifications (15V standoff, 24.4V clamp, 16.4A peak pulse). The EVVO variant operates to 150°C junction temperature versus the original 175°C ambient specification. Verify application temperature requirements before substitution.

Q: What is the difference between SMAJ15A-TP and SMAJ15A-TR?

A: SMAJ15A-TR (STMicroelectronics) has higher clamping voltage (32.5V) and peak pulse current (71A at 8/20µs) compared to SMAJ15A-TP (24.4V, 16.4A at 10/1000µs). These are not direct electrical equivalents. SMAJ15A-TR is suitable only when higher transient suppression is required.

Q: Are packaging differences between Tape & Reel and Cut Tape significant for substitution?

A: No. Packaging format (TR vs. CT) affects only handling and assembly logistics, not electrical performance or component compatibility. Both formats are suitable for surface mount assembly of the DO-214AC (SMA) package.

Q: Why is SMAJ15AHE3/61 listed as discontinued?

A: SMAJ15AHE3/61 is discontinued at DiGi Electronics but remains electrically equivalent to SMAJ15A-TP. Use only if existing inventory is available. For new designs, select from active alternatives: SMAJ15A-13-F (Diodes), SMAJ15A-E3/61 (Vishay), or SMAJ15A (EVVO Semi).

Q: Can SMA6J15A-E3/5A replace SMAJ15A-TP in my circuit?

A: Only if your application requires higher transient energy absorption. SMA6J15A-E3/5A delivers 4000W peak pulse power versus 400W for SMAJ15A-TP, with higher clamping voltage (27.7V vs. 24.4V). Verify circuit tolerance for increased clamping voltage before substitution.

Q: What compliance certifications apply to all listed substitutes?

A: All direct substitutes (SMAJ15A variants from EVVO, Diodes, and Vishay) maintain ROHS3 compliance and MSL 1 (unlimited moisture sensitivity). SMAJ15AHE3/61 includes AEC-Q101 automotive qualification. Verify specific compliance requirements for your application.

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