SMBJ120A-M3/52 Equivalent & Substitute Parts

Part Overview

The SMBJ120A-M3/52 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 120V reverse standoff category with a 193V maximum clamping voltage and 3.1A peak pulse current rating. The part is classified as Active product status and is designed for general purpose transient voltage suppression applications. Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support alternative packaging or sourcing requirements while maintaining electrical and mechanical compatibility.

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
Package / Case	DO-214AA, SMB
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SMBJ120A-M3/52 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 120V
Voltage - Clamping (Max) @ Ipp: 193V ± tolerance
Current - Peak Pulse (10/1000µs): 3.1A ± tolerance
Power - Peak Pulse: 600W
Package / Case: DO-214AA or SMB equivalent
Mounting Type: Surface Mount
Unidirectional Channels: 1

Acceptable Variation Parameters:

Voltage - Breakdown (Min): 133V to 135V range
Operating Temperature Range: -55°C to -50°C minimum; 150°C to 175°C maximum
Packaging format: Tape & Reel (TR), Cut Tape (CT), or equivalent
Manufacturer: Vishay, MDD, Micro Commercial Co, Diodes Incorporated

All substitute parts maintain identical electrical performance within specified tolerances and are compatible with the original application requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Operating Temperature	Package	Packaging Type
SMBJ120A-M3/52	Vishay	120V	193V	3.1A	600W	-55°C ~ 150°C	DO-214AA, SMB	Tape & Reel (TR)
SMBJ120D-M3/H	Vishay	120V	190V	3.15A	600W	-55°C ~ 150°C	DO-214AA, SMB	Tape & Reel (TR)
SMBJ120A-E3/52	Vishay	120V	193V	3.1A	600W	-55°C ~ 150°C	DO-214AA, SMB	Cut Tape (CT) & Digi-Reel®
SMBJ120A	MDD	120V	193V	3.1A	600W	-50°C ~ 150°C	DO-214AA, SMB	Not specified
SMBJ120A-13-F	Diodes Incorporated	120V	193V	3.1A	600W	-55°C ~ 150°C	DO-214AA, SMB	Tape & Reel (TR)
SMBJ120A-TP	Micro Commercial Co	120V	193V	3.1A	600W	-55°C ~ 175°C	DO-214AA, SMB	Tape & Reel (TR)

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and ROHS3 compliance. Selection among equivalent parts is determined by packaging availability, supply chain requirements, and operating temperature specifications.

SMBJ120D-M3/H provides a direct Vishay alternative with clamping voltage of 190V and peak pulse current of 3.15A, both within acceptable tolerance ranges for the 120V standoff class.

SMBJ120A-E3/52 is the manufacturer-recommended substitute from Vishay, offering identical electrical specifications to the original part with alternative packaging format (Cut Tape & Digi-Reel®).

SMBJ120A (MDD) and SMBJ120A-13-F (Diodes Incorporated) provide cross-manufacturer alternatives with identical core electrical parameters. The MDD variant operates to -50°C minimum; the Diodes Incorporated variant extends to -55°C minimum.

SMBJ120A-TP (Micro Commercial Co) extends the maximum operating temperature to 175°C, providing enhanced thermal performance for elevated temperature applications.

Frequently Asked Questions (FAQ)

Q: Can SMBJ120D-M3/H replace SMBJ120A-M3/52 directly?

A: Yes. Both parts share the 120V reverse standoff voltage and 600W peak pulse power rating. The clamping voltage difference (190V vs 193V) and peak pulse current difference (3.15A vs 3.1A) fall within acceptable tolerance ranges for the SMBJ120 product class.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape wound on reels, suitable for high-volume automated assembly. Cut Tape (CT) and Digi-Reel® packaging provide smaller quantities on cut tape segments, suitable for lower-volume or prototype applications. Electrical performance is identical.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental certifications.

Q: Which substitute part offers the widest operating temperature range?

A: SMBJ120A-TP (Micro Commercial Co) operates from -55°C to 175°C, extending the maximum temperature 25°C above the original part's 150°C specification.

Q: Can I use MDD SMBJ120A in applications requiring -55°C minimum operation?

A: No. The MDD variant specifies -50°C minimum operating temperature. For applications requiring -55°C operation, select SMBJ120A-M3/52, SMBJ120D-M3/H, SMBJ120A-E3/52, SMBJ120A-13-F, or SMBJ120A-TP.

Q: Are all substitute parts surface mount in DO-214AA/SMB package?

A: Yes. All listed substitute parts use surface mount technology with DO-214AA or SMB package designation, maintaining mechanical and footprint compatibility with the original part.

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