SMAJ8.0 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMAJ8.0 is an 8V Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a DO-214AC (SMA) package and is classified as obsolete. Due to its obsolete status, identifying functionally equivalent substitute parts is essential for design continuity, procurement flexibility, and long-term supply chain management. Substitute parts must maintain compatibility across electrical performance parameters, mechanical packaging, and operating temperature ranges while meeting current RoHS3 compliance requirements.

Key Parameters

Parameter	SMAJ8.0 (Littelfuse)
Voltage - Reverse Standoff (Typ)	8V
Voltage - Breakdown (Min)	8.42V
Voltage - Clamping (Max) @ Ipp	14.29V
Current - Peak Pulse (10/1000µs)	29.4A
Power - Peak Pulse	400W
Operating Temperature Range	-65°C ~ 150°C (TJ)
Package / Case	DO-214AC (SMA)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the SMAJ8.0 are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Voltage - Reverse Standoff: 8V (fixed requirement)
Voltage - Breakdown (Min): 8.42V to 8.89V (acceptable range)
Package / Case: DO-214AC (SMA) (mandatory mechanical compatibility)
Mounting Type: Surface Mount (mandatory)
Type: Zener (unidirectional TVS diode)
Unidirectional Channels: 1

Substitute parts are classified into two groups based on clamping voltage performance:

Group A (13.6V Clamping): SMAJ8.0A (Meritek), SMAJ8.0A-13-F (Diodes Incorporated), SMAJ8.0A-TP (Micro Commercial Co), SMAJ8.0AE3/TR13 (Microchip Technology)

Group B (18.2V Clamping): SMA6J8.0A-E3/5A (Vishay), SMA6J8.0A-E3/61 (Vishay)

Group C (15V Clamping): SMAJ8.0E3/TR13 (Microchip Technology)

All substitute parts maintain the 8V reverse standoff voltage and DO-214AC (SMA) package specification. Differences in clamping voltage, peak pulse current, and power dissipation reflect manufacturer-specific design variations within the same device category.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	Product Status	RoHS Status
SMAJ8.0	Littelfuse Inc.	8V	8.42V	14.29V	29.4A	400W	-65°C ~ 150°C (TJ)	DO-214AC (SMA)	Obsolete	ROHS3 Compliant
SMAJ8.0A	Meritek	8V	8.89V	13.6V	29.41A	400W	-55°C ~ 150°C	DO-214AC (SMA)	Active	ROHS3 Compliant
SMA6J8.0A-E3/5A	Vishay General Semiconductor - Diodes Division	8V	8.89V	18.2V	220A (8/20µs)	4000W (4kW)	-55°C ~ 150°C (TJ)	DO-214AC (SMA)	Active	ROHS3 Compliant
SMA6J8.0A-E3/61	Vishay General Semiconductor - Diodes Division	8V	8.89V	18.2V	220A (8/20µs)	4000W (4kW)	-55°C ~ 150°C (TJ)	DO-214AC (SMA)	Active	ROHS3 Compliant
SMAJ8.0A-13-F	Diodes Incorporated	8V	8.89V	13.6V	29.4A	400W	-55°C ~ 150°C (TJ)	DO-214AC (SMA)	Active	ROHS3 Compliant
SMAJ8.0A-TP	Micro Commercial Co	8V	8.89V	13.6V	29.4A	400W	-55°C ~ 175°C (TA)	DO-214AC (SMA)	Active	ROHS3 Compliant
SMAJ8.0AE3/TR13	Microchip Technology	8V	8.89V	13.6V	36.7A	500W	-65°C ~ 150°C (TJ)	DO-214AC (SMA)	Active	ROHS3 Compliant
SMAJ8.0E3/TR13	Microchip Technology	8V	8.89V	15V	33.3A	500W	-65°C ~ 150°C (TJ)	DO-214AC (SMA)	Active	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed are active products with current RoHS3 compliance certification, ensuring regulatory alignment and supply chain continuity. Selection among substitute groups should be based on application-specific clamping voltage requirements:

For applications requiring 13.6V clamping voltage: SMAJ8.0A (Meritek), SMAJ8.0A-13-F (Diodes Incorporated), SMAJ8.0A-TP (Micro Commercial Co), and SMAJ8.0AE3/TR13 (Microchip Technology) provide direct functional equivalence with the original SMAJ8.0 in terms of overvoltage protection threshold. SMAJ8.0AE3/TR13 offers extended temperature range (-65°C to 150°C) and higher peak pulse power (500W), matching the original part's temperature specification.

For applications requiring higher transient energy absorption: SMA6J8.0A-E3/5A and SMA6J8.0A-E3/61 (both Vishay TransZorb® series) provide significantly higher peak pulse current (220A at 8/20µs) and power dissipation (4kW), suitable for applications with more severe transient events. These parts feature higher clamping voltage (18.2V) and should be selected only when circuit design permits this voltage margin.

For extended temperature operation: SMAJ8.0A-TP (Micro Commercial Co) supports -55°C to 175°C ambient temperature range, exceeding the original part's specification. SMAJ8.0AE3/TR13 and SMAJ8.0E3/TR13 (Microchip Technology) maintain the original -65°C to 150°C junction temperature range.

All substitute parts maintain DO-214AC (SMA) package compatibility and surface-mount configuration, ensuring PCB layout and assembly process compatibility.

Frequently Asked Questions (FAQ)

Q: Can SMAJ8.0A (Meritek) directly replace the obsolete SMAJ8.0 (Littelfuse)?

A: Yes, SMAJ8.0A maintains the same 8V reverse standoff voltage, 13.6V clamping voltage, 29.41A peak pulse current, and DO-214AC (SMA) package. The primary difference is the lower minimum breakdown voltage (8.89V vs. 8.42V), which remains within acceptable substitution tolerance for general-purpose TVS applications. Operating temperature range is reduced to -55°C to 150°C.

Q: What is the difference between Group A (13.6V) and Group B (18.2V) clamping voltage substitutes?

A: Group A substitutes (13.6V clamping) provide protection thresholds closest to the original SMAJ8.0 (14.29V). Group B substitutes (SMA6J8.0A-E3/5A and SMA6J8.0A-E3/61 with 18.2V clamping) allow higher transient voltages before clamping and dissipate significantly more energy (4kW vs. 400W). Selection depends on circuit tolerance for transient voltage peaks and available energy dissipation capability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts are certified RoHS3 compliant, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: What packaging options are available for substitutes?

A: All substitute parts use the DO-214AC (SMA) surface-mount package, ensuring mechanical and PCB layout compatibility. Packaging formats vary by manufacturer: some are supplied in Tape & Reel (TR), Cut Tape (CT), or standard packaging. Verify packaging format with supplier based on assembly requirements.

Q: Can SMAJ8.0AE3/TR13 (Microchip) be used in place of SMAJ8.0 for extended temperature applications?

A: Yes, SMAJ8.0AE3/TR13 maintains the original -65°C to 150°C junction temperature range and provides 13.6V clamping voltage with higher peak pulse power (500W vs. 400W) and current (36.7A vs. 29.4A). This part is suitable for applications requiring the full original temperature specification.

Q: What is the difference between SMAJ8.0AE3/TR13 and SMAJ8.0E3/TR13 (both Microchip)?

A: Both parts are Microchip products with identical temperature range (-65°C to 150°C) and power rating (500W). The primary difference is clamping voltage: SMAJ8.0AE3/TR13 clamps at 13.6V with 36.7A peak pulse current, while SMAJ8.0E3/TR13 clamps at 15V with 33.3A peak pulse current. Selection depends on circuit voltage margin requirements.

Q: Are Vishay SMA6J8.0A-E3/5A and SMA6J8.0A-E3/61 interchangeable?

A: Yes, both Vishay parts are electrically and mechanically identical, featuring 18.2V clamping voltage, 220A peak pulse current (8/20µs), and 4kW power dissipation. The difference is packaging format: E3/5A and E3/61 represent different tape reel configurations. Selection is based on assembly equipment compatibility and supplier availability.

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