SMAJ6.0 Equivalent & Substitute Parts

Part Overview

The SMAJ6.0 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 6V reverse standoff voltage with a 10.82V maximum clamping voltage and 38.8A peak pulse current capability in a DO-214AC (SMA) package. The product is currently listed as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	SMAJ6.0 (Littelfuse)
Voltage - Reverse Standoff (Typ)	6V
Voltage - Breakdown (Min)	6.32V
Voltage - Clamping (Max) @ Ipp	10.82V
Current - Peak Pulse (10/1000µs)	38.8A
Power - Peak Pulse	400W
Package / Case	DO-214AC, SMA
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SMAJ6.0 is determined by the following critical parameters:

Reverse Standoff Voltage: Must be 6V (all substitutes maintain this specification)
Package / Case: Must be DO-214AC or SMA (surface mount compatibility)
Voltage - Clamping (Max) @ Ipp: Acceptable range 10.3V to 13.7V (within circuit protection tolerance)
Current - Peak Pulse: Minimum 38.8A (38.8A to 290A acceptable)
Power - Peak Pulse: Minimum 400W (400W to 4000W acceptable)
RoHS Status: ROHS3 Compliant (environmental compliance requirement)
Moisture Sensitivity Level: MSL 1 (Unlimited) preferred for handling compatibility

Substitute parts are grouped into two categories based on clamping voltage performance:

Group A (10.3V Clamping): SMAJ6.0A (MDD), SMAJ6.0A-13-F (Diodes Incorporated), SMAJ6.0A-TP (Micro Commercial Co), SMAJ6.0AE3/TR13 (Microchip Technology) — direct functional equivalents with identical clamping characteristics to the original specification.

Group B (13.7V Clamping): SMA6J6.0A-E3/61 (Vishay), SMA6J6.0A-TR (STMicroelectronics), SMAJ6.0E3/TR13 (Microchip Technology) — higher clamping voltage variants suitable for applications requiring enhanced transient suppression.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package	Operating Temperature	Product Status	RoHS Status
SMAJ6.0	Littelfuse Inc.	6V	10.82V	38.8A	400W	DO-214AC, SMA	-65°C ~ 150°C	Obsolete	ROHS3 Compliant
SMAJ6.0A	MDD	6V	10.3V	38.8A	400W	DO-214AC, SMA	-50°C ~ 150°C	Active	ROHS3 Compliant
SMA6J6.0A-E3/61	Vishay General Semiconductor	6V	13.7V	290A (8/20µs)	4000W	DO-214AC, SMA	-55°C ~ 150°C	Active	ROHS3 Compliant
SMA6J6.0A-TP	Micro Commercial Co	6V	10.3V	58.3A	600W	DO-214AC, SMA	-55°C ~ 175°C	Active	ROHS3 Compliant
SMA6J6.0A-TR	STMicroelectronics	6V	13.7V	290A (8/20µs)	600W	DO-214AC, SMA	-55°C ~ 175°C	Active	ROHS3 Compliant
SMAJ6.0A-13-F	Diodes Incorporated	6V	10.3V	38.8A	400W	DO-214AC, SMA	-55°C ~ 150°C	Active	ROHS3 Compliant
SMAJ6.0AE3/TR13	Microchip Technology	6V	10.3V	48.5A	500W	DO-214AC, SMA	-65°C ~ 150°C	Active	ROHS3 Compliant
SMAJ6.0E3/TR13	Microchip Technology	6V	11.4V	43.9A	500W	DO-214AC, SMA	-65°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Functional Equivalents (Group A - 10.3V Clamping)

SMAJ6.0A-13-F (Diodes Incorporated) and SMAJ6.0A (MDD) provide the closest electrical match to the original SMAJ6.0, with identical 38.8A peak pulse current and 400W power dissipation. Both are active products with ROHS3 compliance and MSL 1 rating. SMAJ6.0A-13-F offers the widest operating temperature range (-55°C ~ 150°C) and is available in high inventory (7689 pcs).

SMAJ6.0AE3/TR13 (Microchip Technology) extends the operating temperature range to -65°C ~ 150°C, matching the original specification, with slightly elevated peak pulse current (48.5A) and power rating (500W), providing additional design margin.

Enhanced Performance Variants (Group B - 13.7V Clamping)

SMA6J6.0A-E3/61 (Vishay) and SMA6J6.0A-TR (STMicroelectronics) offer significantly higher transient suppression capability with 290A peak pulse current and 4000W/600W power dissipation respectively. These are suitable for applications requiring enhanced overvoltage protection beyond the original specification. Both maintain ROHS3 compliance and active product status.

Temperature Range Considerations

For applications requiring the original -65°C lower temperature limit, SMAJ6.0AE3/TR13 (Microchip) is the only substitute maintaining this specification. For standard -55°C minimum temperature applications, all other substitutes are acceptable.

Frequently Asked Questions (FAQ)

Q: Can SMAJ6.0A (MDD) directly replace the obsolete SMAJ6.0 (Littelfuse)?

A: Yes. SMAJ6.0A maintains identical reverse standoff voltage (6V), peak pulse current (38.8A), power dissipation (400W), and package format (DO-214AC/SMA). The clamping voltage is 10.3V versus 10.82V, representing a 4.8% reduction within acceptable circuit protection tolerance. Both are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between Group A (10.3V) and Group B (13.7V) substitutes?

A: Group A substitutes maintain clamping voltage near the original 10.82V specification (10.3V range), providing equivalent transient suppression performance. Group B substitutes feature higher clamping voltage (13.7V) with significantly increased peak pulse current (290A) and power dissipation (4000W or 600W), suitable for circuits requiring enhanced overvoltage protection or higher transient energy absorption.

Q: Are all substitute parts available in the same DO-214AC (SMA) package?

A: Yes. All listed substitutes use DO-214AC or SMA package designation, ensuring mechanical and electrical compatibility with existing PCB layouts and reflow soldering processes. Packaging variants (Tape & Reel, Cut Tape, Bulk) do not affect component functionality.

Q: Which substitute offers the best inventory availability?

A: SMAJ6.0A-13-F (Diodes Incorporated) has the highest inventory level at 7689 pcs, followed by SMAJ6.0A (MDD) at 20400 pcs. Both are active products with immediate availability.

Q: Do all substitutes meet RoHS3 compliance?

A: Yes. All listed substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, meeting environmental and handling requirements equivalent to the original SMAJ6.0.

Q: What operating temperature range should I select?

A: For applications operating within -55°C to 150°C, any substitute is acceptable. For applications requiring -65°C minimum temperature operation, select SMAJ6.0AE3/TR13 (Microchip Technology) or SMAJ6.0E3/TR13 (Microchip Technology), which maintain the original -65°C lower limit.

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