SMBJ8.0C Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ8.0C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features an 8V reverse standoff voltage with a 14.28V maximum clamping voltage and 44.2A peak pulse current capability in a DO-214AA (SMB) package. The SMBJ8.0C is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	8V
Voltage - Breakdown (Min)	8.42V
Voltage - Clamping (Max) @ Ipp	14.28V
Current - Peak Pulse (10/1000µs)	44.2A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature Range	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SMBJ8.0C is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff: Must be 8V
Voltage - Clamping (Max) @ Ipp: Must be 13.6V or 14.28V (within acceptable clamping range)
Current - Peak Pulse (10/1000µs): Must be 44.1A, 44.2A, or 58.8A (equal or greater)
Power - Peak Pulse: Must be 600W or 800W (equal or greater)
Package / Case: Must be DO-214AA or SMB
Mounting Type: Must be Surface Mount
RoHS Status: Must be ROHS3 Compliant

All identified substitute parts meet these criteria and are classified as active products, ensuring long-term availability and manufacturing support.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status
SMBJ8.0C	Littelfuse Inc.	8V	14.28V	44.2A	600W	-65°C ~ 150°C	Obsolete
SMBJ8.0CA	MDD	8V	13.6V	44.2A	600W	-50°C ~ 150°C	Active
SMB8J8.0CA-E3/52	Vishay General Semiconductor - Diodes Division	8V	13.6V	58.8A	800W	-55°C ~ 150°C	Active
SMBJ8.0CA-13-F	Diodes Incorporated	8V	13.6V	44.1A	600W	-55°C ~ 150°C	Active
SMBJ8.0CA-E3/5B	Vishay General Semiconductor - Diodes Division	8V	13.6V	44.1A	600W	-55°C ~ 150°C	Active
SMBJ8.0CA-TP	Micro Commercial Co	8V	13.6V	44.1A	600W	-55°C ~ 175°C	Active
SMBJ8V0CA	Taiwan Semiconductor Corporation	8V	13.6V	44.1A	600W	-55°C ~ 150°C	Active

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings, ensuring regulatory compliance and manufacturing continuity. The primary distinction among substitutes relates to clamping voltage and peak pulse current specifications:

Direct Electrical Equivalents (13.6V clamping, 44.1A–44.2A peak pulse current): SMBJ8.0CA (MDD), SMBJ8.0CA-13-F (Diodes Incorporated), SMBJ8.0CA-E3/5B (Vishay), SMBJ8.0CA-TP (Micro Commercial Co), and SMBJ8V0CA (Taiwan Semiconductor Corporation) provide functional equivalence to the SMBJ8.0C with reduced clamping voltage (13.6V vs. 14.28V). These parts are suitable for applications where the lower clamping threshold is acceptable.

Enhanced Performance Alternative (13.6V clamping, 58.8A peak pulse current, 800W power dissipation): SMB8J8.0CA-E3/52 (Vishay) offers increased current handling and power dissipation capability, providing margin for higher transient stress conditions while maintaining the same 8V standoff voltage.

Temperature Considerations: SMBJ8.0CA-TP extends the upper operating temperature to 175°C, compared to 150°C for most alternatives, providing thermal margin in high-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can SMBJ8.0CA directly replace SMBJ8.0C?

A: Yes. Both parts share identical reverse standoff voltage (8V), peak pulse current (44.2A), power dissipation (600W), and DO-214AA SMB package specifications. The clamping voltage difference (13.6V vs. 14.28V) represents a 4.7% reduction, which is acceptable for general-purpose overvoltage protection applications where the circuit design accommodates this tolerance.

Q: What is the difference between SMBJ8.0CA and SMB8J8.0CA-E3/52?

A: Both maintain 8V standoff voltage and 13.6V clamping voltage. SMB8J8.0CA-E3/52 provides enhanced peak pulse current (58.8A vs. 44.2A) and power dissipation (800W vs. 600W), offering greater transient protection capability. Selection depends on circuit transient stress levels.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use DO-214AA (SMB) surface-mount packaging, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Q: Does clamping voltage affect circuit compatibility?

A: Clamping voltage determines the maximum voltage spike that reaches protected circuitry. The SMBJ8.0C's 14.28V clamping is higher than substitute parts at 13.6V. Substitution is valid when downstream components tolerate the lower clamping voltage. Circuit analysis is required if voltage margin is critical.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL 1 (Unlimited) moisture sensitivity ratings, meeting current regulatory requirements and manufacturing standards.

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