SMBJ150 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ150 is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 150V reverse standoff voltage rating with a 255.15V maximum clamping voltage and 2.5A peak pulse current capability in a surface-mount DO-214AA (SMB) package. The SMBJ150 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	150V	V
Voltage - Breakdown (Min)	158.4V	V
Voltage - Clamping (Max) @ Ipp	255.15V	V
Current - Peak Pulse (10/1000µs)	2.5A	A
Power - Peak Pulse	600W	W
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65°C ~ 150°C	°C (TJ)
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMBJ150 is determined by the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): Must be 150V or within acceptable tolerance for the application
Voltage - Clamping (Max) @ Ipp: Must not exceed 255.15V to ensure adequate transient suppression
Current - Peak Pulse (10/1000µs): Must support minimum 2.5A to handle specified surge conditions
Power - Peak Pulse: Must maintain 600W dissipation capability
Package / Case: Must be DO-214AA or SMB equivalent for PCB compatibility
Mounting Type: Must be Surface Mount for assembly process compatibility
RoHS & MSL Compliance: Must meet ROHS3 and MSL 1 standards for environmental and manufacturing requirements

The substitute parts listed below meet these criteria with minor variations in clamping voltage and peak pulse current that remain within acceptable operating margins for general-purpose transient voltage suppression applications.

Parameter Comparison

Parameter	SMBJ150 (Littelfuse)	SMBJ150A (MDD)	SMBJ150A-13-F (Diodes Inc.)	SMBJ150A-TP (Micro Commercial)	SMBJ150E3/TR13 (Microchip)	TV06B151J-G (Comchip)	SMBJ154A-TR (STMicroelectronics)
Voltage - Reverse Standoff (Typ)	150V	150V	150V	150V	150V	150V	154V
Voltage - Breakdown (Min)	158.4V	167V	167V	167V	167V	167V	171V
Voltage - Clamping (Max) @ Ipp	255.15V	243V	243V	243V	268V	243V	246V
Current - Peak Pulse (10/1000µs)	2.5A	2.5A	2.5A	2.5A	2.2A	2.47A	2.4A
Power - Peak Pulse	600W	600W	600W	600W	600W	600W	600W
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature Range	-65°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C	-65°C ~ 150°C	Not specified	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and MSL 1 ratings, ensuring compliance with current environmental and manufacturing standards. The primary substitutes—SMBJ150A (MDD), SMBJ150A-13-F (Diodes Incorporated), SMBJ150A-TP (Micro Commercial Co), and TV06B151J-G (Comchip Technology)—maintain the 150V reverse standoff voltage with clamping voltages of 243V, representing a 4.8% reduction from the original 255.15V specification. This reduction remains within acceptable operating margins for general-purpose transient suppression.

SMBJ150E3/TR13 (Microchip Technology) offers identical reverse standoff voltage but features a higher clamping voltage of 268V with slightly reduced peak pulse current of 2.2A. This variant is suitable for applications requiring higher clamping voltage tolerance.

SMBJ154A-TR (STMicroelectronics) presents a 154V reverse standoff voltage with 246V clamping voltage and 2.4A peak pulse current. The 4V increase in standoff voltage represents a 2.7% deviation and may be acceptable depending on circuit design margins.

For new designs and production continuity, SMBJ150A-13-F (Diodes Incorporated) and SMBJ150A-TP (Micro Commercial Co) are recommended as primary alternatives due to active product status, established supply availability, and full parameter alignment with the original SMBJ150 specification.

Frequently Asked Questions (FAQ)

Q: Can SMBJ150A (MDD) directly replace SMBJ150 (Littelfuse) in existing designs?

A: Yes. Both parts maintain identical 150V reverse standoff voltage, 2.5A peak pulse current, and 600W power dissipation. The clamping voltage reduction from 255.15V to 243V represents a 4.8% improvement in transient suppression performance. Package and mounting specifications are identical (DO-214AA, SMB, surface mount).

Q: What is the significance of the clamping voltage difference between SMBJ150 and its substitutes?

A: Clamping voltage determines the maximum voltage spike that reaches protected circuitry during a transient event. Lower clamping voltages provide better protection. The 243V clamping voltage of SMBJ150A variants is more protective than the original 255.15V specification, making these substitutes functionally superior for transient suppression.

Q: Is SMBJ150E3/TR13 (Microchip) a suitable substitute despite its 268V clamping voltage?

A: SMBJ150E3/TR13 maintains the 150V reverse standoff voltage and 600W power dissipation but features higher clamping voltage (268V) and slightly reduced peak pulse current (2.2A). This part is suitable only if circuit design margins accommodate the higher clamping voltage. Verify application requirements before selection.

Q: Why is SMBJ154A-TR (STMicroelectronics) listed as a substitute when its standoff voltage is 154V instead of 150V?

A: SMBJ154A-TR maintains compatible electrical performance with 246V clamping voltage, 2.4A peak pulse current, and 600W power dissipation. The 4V increase in standoff voltage (2.7% deviation) remains within acceptable tolerance for general-purpose transient suppression applications. Verify circuit design margins before substitution.

Q: Are all substitute parts available in the same packaging and mounting configuration?

A: Yes. All substitute parts listed are packaged in DO-214AA (SMB) surface-mount configuration, ensuring direct PCB compatibility without layout modifications or assembly process changes.

Q: Do all substitute parts meet current environmental and manufacturing compliance standards?

A: Yes. All substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, meeting current environmental regulations and manufacturing requirements for storage and handling.

Q: What is the recommended substitute for new product designs?

A: SMBJ150A-13-F (Diodes Incorporated) or SMBJ150A-TP (Micro Commercial Co) are recommended for new designs. Both maintain full electrical parameter alignment with the original SMBJ150, offer active product status with established supply chains, and provide superior clamping voltage performance (243V).

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