SMAJ13 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMAJ13 is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 13V reverse standoff voltage with a 22.58V maximum clamping voltage at peak pulse current of 18.6A, housed in a DO-214AC (SMA) package. The SMAJ13 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility within specified electrical and mechanical parameters.

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 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMAJ13 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 13V
Package / Case: DO-214AC, SMA
Type: Zener, Unidirectional
Unidirectional Channels: 1
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Secondary Compatibility Parameters:

Voltage - Breakdown (Min): 13.64V to 14.4V range
Voltage - Clamping (Max) @ Ipp: 21.5V to 23.9V range
Current - Peak Pulse (10/1000µs): 18.6A to 147A range
Power - Peak Pulse: 400W to 4000W range
Operating Temperature Range: -65°C to -50°C minimum; 150°C to 175°C maximum

Substitute parts are grouped into two categories based on electrical performance characteristics: standard performance (18.6A peak pulse current, 400W power dissipation) and enhanced performance (147A peak pulse current, 4000W power dissipation).

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
SMAJ13	Littelfuse Inc.	13V	13.64V	22.58V	18.6A	400W	-65 to 150°C (TJ)	DO-214AC, SMA	Obsolete
SMAJ13A	MDD	13V	14.4V	21.5V	18.6A	400W	-50 to 150°C (TJ)	DO-214AC, SMA	Active
SMA6J13A-E3/5A	Vishay General Semiconductor - Diodes Division	13V	14.4V	23.9V	147A (8/20µs)	4000W	-55 to 150°C (TJ)	DO-214AC, SMA	Active
SMA6J13A-E3/61	Vishay General Semiconductor - Diodes Division	13V	14.4V	23.9V	147A (8/20µs)	4000W	-55 to 150°C (TJ)	DO-214AC, SMA	Active
SMA6J13A-M3/61	Vishay General Semiconductor - Diodes Division	13V	14.4V	23.9V	147A (8/20µs)	4000W	-55 to 150°C (TJ)	DO-214AC, SMA	Active
SMA6J13A-TP	Micro Commercial Co	13V	14.4V	21.5V	27.9A	600W	-55 to 175°C (TA)	DO-214AC, SMA	Active
SMA6J13A-TR	STMicroelectronics	13V	14.4V	23.9V	147A (8/20µs)	600W	-55 to 175°C (TJ)	DO-214AC, SMA	Active
SMAJ13A-13-F	Diodes Incorporated	13V	14.4V	21.5V	18.6A	400W	-55 to 150°C (TJ)	DO-214AC, SMA	Active
SMAJ13A-TP	Micro Commercial Co	13V	14.4V	21.5V	18.6A	400W	-55 to 175°C (TA)	DO-214AC, SMA	Active
SMAJ13A-TR	STMicroelectronics	13V	14.4V	27.2V	85A (8/20µs)	400W	-55 to 150°C (TJ)	DO-214AC, SMA	Active

Engineering Selection Recommendations

All identified substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, consistent with the original SMAJ13 specification. Selection among active alternatives depends on application-specific requirements within the defined electrical parameter ranges.

Standard Performance Tier (18.6A peak pulse current, 400W power dissipation): SMAJ13A (MDD), SMAJ13A-13-F (Diodes Incorporated), and SMAJ13A-TP (Micro Commercial Co) provide direct functional equivalence to the original SMAJ13 with active product status and full compliance certification.

Enhanced Performance Tier (147A peak pulse current, 4000W power dissipation): SMA6J13A-E3/5A, SMA6J13A-E3/61, and SMA6J13A-M3/61 (all Vishay General Semiconductor - Diodes Division) offer increased transient suppression capability within the same package footprint and voltage class.

Intermediate Performance Tier (27.9A to 85A peak pulse current, 600W power dissipation): SMA6J13A-TP (Micro Commercial Co) and SMA6J13A-TR (STMicroelectronics) provide performance between standard and enhanced tiers.

All substitute parts are manufactured in DO-214AC (SMA) surface-mount package with 13V reverse standoff voltage and operate within -55°C to 175°C temperature range, exceeding the original -65°C to 150°C specification.

Frequently Asked Questions (FAQ)

Q: Can SMAJ13A (MDD) directly replace the obsolete SMAJ13 (Littelfuse)?

A: Yes. Both devices share identical reverse standoff voltage (13V), peak pulse current (18.6A), power dissipation (400W), and DO-214AC (SMA) package. The SMAJ13A operates within a narrower temperature range (-50 to 150°C versus -65 to 150°C) and exhibits slightly lower clamping voltage (21.5V versus 22.58V), both within acceptable substitution parameters for general-purpose transient suppression applications.

Q: What is the difference between standard performance (18.6A) and enhanced performance (147A) substitute parts?

A: Enhanced performance parts (Vishay SMA6J13A series) provide 7.9× higher peak pulse current handling and 10× higher power dissipation capability. Selection depends on application transient energy levels. Standard performance parts are suitable for low-energy transient environments; enhanced performance parts address high-energy transient suppression requirements while maintaining identical 13V reverse standoff voltage and DO-214AC package compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts carry ROHS3 compliance certification and MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMAJ13 specification.

Q: Does operating temperature range affect substitution suitability?

A: Operating temperature range is a secondary consideration. The original SMAJ13 specifies -65 to 150°C (TJ). All substitute parts operate within -55 to 175°C range, which encompasses or exceeds the original specification. Selection should confirm application temperature requirements fall within the substitute part's rated range.

Q: Can parts with different clamping voltages (21.5V to 27.2V) be interchanged?

A: Clamping voltage variation within the 21.5V to 27.2V range is acceptable for general-purpose transient suppression where the protected circuit tolerates this voltage window. Applications requiring precise clamping voltage control should select parts with clamping specifications closest to the original 22.58V value: SMAJ13A (21.5V) or SMA6J13A series (23.9V).

Q: What packaging options are available for these substitute parts?

A: All substitute parts are supplied in DO-214AC (SMA) surface-mount package, maintaining mechanical and electrical compatibility with the original SMAJ13. Packaging variants (Tape & Reel, Cut Tape & Digi-Reel) affect supply chain logistics but do not alter electrical performance or board-level compatibility.

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