SMAJ13C Equivalent & Substitute Parts

Part Overview

The SMAJ13C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 13V reverse standoff voltage, 22.58V maximum clamping voltage, and 18.6A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ13C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, and thermal specifications while meeting modern compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	13	V
Voltage - Breakdown (Min)	13.64	V
Voltage - Clamping (Max) @ Ipp	22.58	V
Current - Peak Pulse (10/1000µs)	18.6	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65°C to 150°C	TJ
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ13C are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff: 13V (exact match required)
Voltage - Breakdown (Min): 13.64V to 14.4V (acceptable range)
Package / Case: DO-214AC, SMA (exact match required)
Mounting Type: Surface Mount (exact match required)
Bidirectional Channels: 1 (exact match required)
Type: Zener (exact match required)

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: 21.5V to 23.9V (within acceptable suppression range)
Current - Peak Pulse (10/1000µs): 18.6A to 147A (higher values provide enhanced protection margin)
Power - Peak Pulse: 400W to 600W (higher values acceptable)
Operating Temperature Range: -55°C to 175°C (must encompass or match original -65°C to 150°C)

All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing and environmental standards.

Parameter Comparison

Part Number	Manufacturer	VR (Typ) V	VBR (Min) V	VC (Max) @ Ipp V	Ipp (10/1000µs) A	PPP W	Temp Range °C	Status
SMAJ13C	Littelfuse Inc.	13	13.64	22.58	18.6	400	-65 to 150	Obsolete
SMAJ13CA	Meritek	13	14.4	21.5	18.6	400	-55 to 150	Active
SMA6J13CA-TP	Micro Commercial Co	13	14.4	21.5	27.9	600	-55 to 175	Active
SMA6J13CA-TR	STMicroelectronics	13	14.4	23.9	147	600	-55 to 175	Active
SMAJ13CA-13-F	Diodes Incorporated	13	14.4	21.5	18.6	400	-55 to 150	Active
SMAJ13CA-TP	Micro Commercial Co	13	14.4	21.5	18.6	400	-55 to 175	Active
SMAJ13CAE3/TR13	Microchip Technology	13	14.4	21.5	23.2	500	-65 to 150	Active
SMAJ13CE3/TR13	Microchip Technology	13	14.4	23.8	21	500	-65 to 150	Active
TV04A130JB-G	Comchip Technology	13	14.4	21.5	18.6	400	-55 to 150	Active

Engineering Selection Recommendations

Direct Electrical Equivalents (Minimum Substitution): SMAJ13CA (Meritek), SMAJ13CA-13-F (Diodes Incorporated), and TV04A130JB-G (Comchip Technology) provide direct electrical equivalence to the SMAJ13C with identical peak pulse current (18.6A) and power dissipation (400W). These parts are suitable for direct replacement in existing designs without circuit modification. All three are active products with ROHS3 compliance and MSL 1 rating.

Enhanced Performance Alternatives: SMAJ13CA-TP (Micro Commercial Co) and SMAJ13CAE3/TR13 (Microchip Technology) offer improved thermal performance with extended operating temperature ranges (-55°C to 175°C and -65°C to 150°C respectively) and higher power dissipation (400W to 500W). These are recommended for applications requiring enhanced reliability margins or operation in elevated temperature environments.

High-Current Protection: SMA6J13CA-TP (Micro Commercial Co) and SMA6J13CA-TR (STMicroelectronics) provide significantly higher peak pulse current capability (27.9A and 147A respectively) and power dissipation (600W). SMA6J13CA-TR offers the highest transient protection with 147A peak pulse current. These parts are suitable for applications requiring enhanced surge protection beyond the original specification.

Temperature-Matched Selection: SMAJ13CAE3/TR13 and SMAJ13CE3/TR13 (both Microchip Technology) maintain the original -65°C lower temperature limit, ensuring compatibility with designs requiring extended low-temperature operation. SMAJ13CE3/TR13 additionally provides higher clamping voltage (23.8V) for applications with tighter voltage regulation requirements.

All substitute parts maintain DO-214AC (SMA) package compatibility, surface-mount configuration, and ROHS3 compliance with the original SMAJ13C specification.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for SMAJ13C? A: Yes, all listed substitute parts are electrically compatible with the SMAJ13C based on matching 13V reverse standoff voltage, DO-214AC package, and surface-mount configuration. However, verify your specific application requirements for clamping voltage and peak pulse current before selection.

Q: What is the difference between parts with identical electrical ratings but different manufacturers? A: Manufacturers may employ different semiconductor processes, resulting in variations in clamping voltage (21.5V to 23.9V range) and peak pulse current (18.6A to 147A range) while maintaining the same 13V standoff voltage. These variations remain within acceptable suppression parameters for general-purpose TVS applications. Verify compatibility with your circuit's voltage regulation tolerance.

Q: Why do some substitute parts have higher peak pulse current ratings? A: Higher peak pulse current ratings (27.9A, 147A) indicate enhanced transient protection capability. These parts suppress larger surge events without exceeding clamping voltage limits. Selection depends on your application's expected transient magnitude and circuit protection requirements.

Q: Are all substitute parts available in tape and reel packaging? A: Most substitute parts are available in tape and reel (TR) packaging for automated assembly. Verify packaging availability with your supplier, as some parts may be offered in alternative formats. Packaging designation is included in the part number suffix (e.g., -TP, -TR, -13-F).

Q: What is the significance of the operating temperature range differences? A: The original SMAJ13C operates from -65°C to 150°C. Substitute parts range from -55°C to 175°C. If your application requires operation below -55°C, select SMAJ13CAE3/TR13 or SMAJ13CE3/TR13 (both -65°C minimum). For elevated temperature environments above 150°C, select parts rated to 175°C.

Q: Do all substitute parts meet RoHS3 compliance? A: Yes, all listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with modern manufacturing processes and environmental regulations.

Q: Which substitute part should I select for new designs? A: For new designs, select from active-status parts with extended temperature ranges and higher power dissipation: SMAJ13CA-TP, SMAJ13CAE3/TR13, or SMA6J13CA-TR. These provide enhanced reliability margins and are supported by active manufacturer supply chains.

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