SMBJ120A-M3/5B Equivalent & Substitute Parts

Part Overview

The SMBJ120A-M3/5B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the DO-214AA (SMB) package and is designed for general-purpose transient voltage suppression applications. The part is active in production status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified based on matching electrical specifications and package compatibility to support procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	120V
Voltage - Breakdown (Min)	133V
Voltage - Clamping (Max) @ Ipp	193V
Current - Peak Pulse (10/1000µs)	3.1A
Power - Peak Pulse	600W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SMBJ120A-M3/5B are classified into two categories based on electrical and mechanical compatibility:

Category 1: Direct Electrical Equivalents (Identical Specifications) These parts maintain identical electrical performance across all critical parameters: 120V reverse standoff voltage, 133V minimum breakdown voltage, 193V maximum clamping voltage, 3.1A peak pulse current, and 600W peak pulse power. All parts are housed in the DO-214AA (SMB) surface mount package. Substitution within this category is based on packaging format (Tape & Reel vs. Cut Tape) and manufacturer availability. Parts in this category include SMBJ120A-E3/52, SMBJ120A (MDD), SMBJ120A-13-F, and SMBJ120A-TP.

Category 2: Manufacturer-Recommended Alternatives (Related Voltage Ratings) These parts share the same package, mounting type, and power rating but operate at different voltage ratings. SMBJ110A provides 110V reverse standoff with 177V clamping voltage and 3.4A peak pulse current. SMBJ100A provides 100V reverse standoff with 162V clamping voltage and 3.7A peak pulse current. These alternatives are suitable only when circuit design permits operation at lower voltage thresholds.

Parameter Comparison

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	Packaging Format
SMBJ120A-M3/5B	Vishay General Semiconductor	120V	133V	193V	3.1A	600W	-55°C ~ 150°C	DO-214AA, SMB	Tape & Reel (TR)
SMBJ120A-E3/52	Vishay General Semiconductor	120V	133V	193V	3.1A	600W	-55°C ~ 150°C	DO-214AA, SMB	Cut Tape (CT) & Digi-Reel®
SMBJ120A	MDD	120V	133V	193V	3.1A	600W	-50°C ~ 150°C	DO-214AA, SMB	Not specified
SMBJ120A-13-F	Diodes Incorporated	120V	133V	193V	3.1A	600W	-55°C ~ 150°C	DO-214AA, SMB	Tape & Reel (TR)
SMBJ120A-TP	Micro Commercial Co	120V	133V	193V	3.1A	600W	-55°C ~ 175°C	DO-214AA, SMB	Tape & Reel (TR)
SMBJ110A	MDD	110V	122V	177V	3.4A	600W	-50°C ~ 150°C	DO-214AA, SMB	Not specified
SMBJ100A	MDD	100V	111V	162V	3.7A	600W	-50°C ~ 150°C	DO-214AA, SMB	Not specified

Engineering Selection Recommendations

Direct Substitution (Category 1): SMBJ120A-E3/52, SMBJ120A (MDD), SMBJ120A-13-F, and SMBJ120A-TP are electrically and mechanically equivalent to SMBJ120A-M3/5B. All parts maintain active product status and ROHS3 compliance. Selection among these equivalents depends on packaging format availability and procurement requirements. SMBJ120A-TP offers extended operating temperature range to 175°C, providing additional thermal margin in high-temperature applications. The Vishay SMBJ120A-E3/52 maintains identical specifications with alternative packaging format (Cut Tape & Digi-Reel®).

Alternative Selection (Category 2): SMBJ110A and SMBJ100A are manufacturer-recommended alternatives suitable only when circuit design specifications permit operation at lower voltage thresholds. These parts are not direct substitutes and require circuit validation before implementation. Both alternatives maintain the same DO-214AA (SMB) package and 600W power rating but operate at reduced voltage levels with correspondingly higher peak pulse currents.

Frequently Asked Questions (FAQ)

Q: Can SMBJ120A-E3/52 replace SMBJ120A-M3/5B directly? A: Yes. Both parts are manufactured by Vishay General Semiconductor with identical electrical specifications (120V standoff, 193V clamping, 3.1A peak pulse). The difference is packaging format: SMBJ120A-M3/5B uses Tape & Reel (TR) while SMBJ120A-E3/52 uses Cut Tape (CT) & Digi-Reel®. Direct substitution is valid if your assembly process accommodates the packaging format.

Q: What is the difference between SMBJ120A from different manufacturers? A: All SMBJ120A variants maintain identical electrical specifications and DO-214AA (SMB) package. Differences exist in operating temperature range (MDD variant: -50°C to 150°C vs. Vishay/Diodes/Micro Commercial: -55°C to 150°C or higher) and manufacturer-specific packaging options. Selection should be based on temperature requirements and supply availability.

Q: Can SMBJ110A or SMBJ100A be used instead of SMBJ120A-M3/5B? A: These are not direct substitutes. SMBJ110A operates at 110V standoff with 177V clamping; SMBJ100A operates at 100V standoff with 162V clamping. Use these alternatives only if your circuit design permits operation at lower voltage thresholds. Circuit validation is required before implementation.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (unlimited moisture sensitivity level), matching the compliance profile of SMBJ120A-M3/5B.

Q: What packaging formats are available for direct equivalents? A: Direct equivalents are available in Tape & Reel (TR) format (SMBJ120A-M3/5B, SMBJ120A-13-F, SMBJ120A-TP) and Cut Tape (CT) & Digi-Reel® format (SMBJ120A-E3/52). Confirm your assembly equipment compatibility before selecting packaging format.

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