SMAJ15CA-13 Equivalent & Substitute Parts

Part Overview

The SMAJ15CA-13 is a transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated in the DO-214AC (SMA) surface mount package. This zener-type TVS diode is designed for general-purpose transient voltage protection with a 15V reverse standoff voltage and 24.4V maximum clamping voltage at peak pulse current. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.

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°C ~ 150°C	TJ
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SMAJ15CA-13 is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Voltage - Reverse Standoff (Typ): 15V
Voltage - Breakdown (Min): 16.7V
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Type: Zener
Bidirectional Channels: 1

Secondary Compatibility Parameters:

Voltage - Clamping (Max) @ Ipp: 24.4V (±tolerance acceptable)
Current - Peak Pulse (10/1000µs): 16.4A (±tolerance acceptable)
Power - Peak Pulse: 400W (equal or greater acceptable)
Operating Temperature Range: -55°C ~ 150°C (equal or wider range acceptable)

Substitute parts are grouped into two categories: Direct Electrical Equivalents (matching all primary and secondary parameters within tolerance) and Functional Alternatives (matching primary criteria with variations in peak pulse current, clamping voltage, or power rating that remain within the application envelope).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	Product Status	RoHS Status
SMAJ15CA-13	Diodes Incorporated	15V	16.7V	24.4V	16.4A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	Discontinued	RoHS non-compliant
SMAJ15CA-13-F	Diodes Incorporated	15V	16.7V	24.4V	16.4A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	Active	ROHS3 Compliant
TV04A150JB-G	Comchip Technology	15V	16.7V	24.4V	16.39A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	Active	ROHS3 Compliant
SM4T18CAY	STMicroelectronics	15V	16.7V	32.5V	71A (8/20µs)	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	Active	ROHS3 Compliant
SMA6J15CA-TP	Micro Commercial Co	15V	16.7V	24.4V	24.6A	600W	-55°C ~ 175°C (TA)	DO-214AC, SMA	Active	ROHS3 Compliant
SMA6J15CA-TR	STMicroelectronics	15V	16.7V	27.7V	123A (8/20µs)	600W	-55°C ~ 175°C (TJ)	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ15CA	EVVO Semi	15V	16.7V	24.4V	16.4A	400W	-65°C ~ 150°C (TJ)	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ15CA-TP	Micro Commercial Co	15V	16.7V	24.4V	16.4A	400W	-55°C ~ 175°C (TA)	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ15CA-TR	STMicroelectronics	15V	16.7V	32.5V	71A (8/20µs)	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ15CAE3/TR13	Microchip Technology	15V	16.7V	24.4V	20.6A	500W	-65°C ~ 150°C (TJ)	DO-214AC, SMA	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Electrical Equivalents (Recommended Primary Substitutes):

SMAJ15CA-13-F (Diodes Incorporated) and TV04A150JB-G (Comchip Technology) provide direct electrical equivalence to the SMAJ15CA-13 with identical voltage and current specifications. Both are active products with ROHS3 compliance. SMAJ15CA-13-F maintains the same manufacturer lineage and is available in Tape & Reel packaging. TV04A150JB-G offers equivalent performance from an alternative qualified manufacturer.

SMAJ15CA-TP (Micro Commercial Co) and SMAJ15CA (EVVO Semi) match the primary electrical parameters with identical 15V standoff, 16.7V breakdown, and 24.4V clamping voltages. Both are active products with ROHS3 compliance. SMAJ15CA-TP extends the operating temperature range to -55°C ~ 175°C. SMAJ15CA extends the lower temperature limit to -65°C.

SMAJ15CAE3/TR13 (Microchip Technology) provides electrical equivalence with a higher peak pulse power rating of 500W and extended lower temperature range to -65°C, offering enhanced thermal margin.

Functional Alternatives (Higher Performance Variants):

SM4T18CAY (STMicroelectronics) and SMAJ15CA-TR (STMicroelectronics) feature higher clamping voltages (32.5V) and significantly higher peak pulse currents (71A at 8/20µs pulse), providing enhanced transient suppression capability. These are suitable where additional protection margin is required.

SMA6J15CA-TP (Micro Commercial Co) and SMA6J15CA-TR (STMicroelectronics) offer higher peak pulse power ratings (600W) with increased current handling. SMA6J15CA-TR provides the highest peak pulse current (123A at 8/20µs) among all alternatives.

All substitute parts are ROHS3 compliant and active products, ensuring regulatory compliance and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can SMAJ15CA-13-F be used as a direct replacement for SMAJ15CA-13?

A: Yes. SMAJ15CA-13-F is electrically identical to SMAJ15CA-13 with matching voltage ratings (15V standoff, 16.7V breakdown, 24.4V clamping) and current specifications (16.4A peak pulse). The primary difference is product status: SMAJ15CA-13-F is active while SMAJ15CA-13 is discontinued. SMAJ15CA-13-F also offers improved RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between the 10/1000µs and 8/20µs pulse specifications?

A: These represent different test pulse waveforms. The 10/1000µs pulse is a standard transient suppression test waveform, while 8/20µs is an alternative pulse shape used by some manufacturers. Parts specified with 8/20µs pulses (such as SM4T18CAY and SMA6J15CA-TR) may exhibit different peak current ratings under the same voltage conditions due to the pulse shape difference. Both waveforms are valid for TVS diode characterization.

Q: Are the higher clamping voltage alternatives (SM4T18CAY, SMAJ15CA-TR, SMA6J15CA-TR) suitable replacements?

A: These parts maintain the 15V reverse standoff voltage but feature higher clamping voltages (32.5V or 27.7V) and significantly higher peak pulse currents. They are functionally compatible if the circuit can tolerate the higher clamping voltage. Use these alternatives only when additional transient suppression capability is required or when the original part is unavailable.

Q: What packaging options are available?

A: All substitute parts use the DO-214AC (SMA) surface mount package, matching the original SMAJ15CA-13. Packaging variants include Cut Tape (CT) & Digi-Reel and Tape & Reel (TR) options. Select based on your assembly process requirements.

Q: Which substitute offers the widest operating temperature range?

A: SMAJ15CA-TP (Micro Commercial Co) and SMA6J15CA-TR (STMicroelectronics) both extend to -55°C ~ 175°C, providing the widest temperature range. SMAJ15CA (EVVO Semi) and SMAJ15CAE3/TR13 (Microchip Technology) extend the lower limit to -65°C, suitable for extreme cold environments.

Q: Are all substitutes RoHS compliant?

A: Yes. All active substitute parts listed are ROHS3 compliant. The original SMAJ15CA-13 is RoHS non-compliant, making the substitutes preferable for new designs and regulatory compliance requirements.

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