SMBJ150C Equivalent & Substitute Parts

Part Overview

The SMBJ150C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 150V reverse standoff voltage with a 255.15V maximum clamping voltage at peak pulse current. The SMBJ150C is classified as obsolete, necessitating identification of active substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the SMBJ150C is determined by strict equivalence across the following electrical and mechanical parameters:

Reverse standoff voltage: 150V (nominal)
Peak pulse current rating: 2.5A
Peak pulse power rating: 600W
Package type: DO-214AA / SMB surface mount
Bidirectional channel configuration: 1 channel
Type classification: Zener TVS diode
Applications: General purpose overvoltage protection

All identified substitute parts maintain these core specifications. Variations in clamping voltage (243V vs. 255.15V) and operating temperature ranges are within acceptable tolerance bands for this component category and do not preclude substitution. All substitute parts are RoHS3 compliant and carry MSL rating of 1 (Unlimited).

Parameter Comparison

Parameter	SMBJ150C (Littelfuse)	SMBJ150CA (MDD)	SMBJ150CA-13-F (Diodes Inc.)	SMBJ150CA-E3/5B (Vishay)	SMBJ150CA-TP (Micro Commercial)
Reverse Standoff Voltage (Typ)	150V	150V	150V	150V	150V
Breakdown Voltage (Min)	158.4V	167V	167V	167V	167V
Clamping Voltage (Max) @ Ipp	255.15V	243V	243V	243V	243V
Peak Pulse Current (10/1000µs)	2.5A	2.5A	2.5A	2.5A	2.5A
Peak Pulse Power	600W	600W	600W	600W	600W
Operating Temperature Range	-65°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C
Package / Case	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
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All identified substitute parts are active products with current manufacturing status, ensuring long-term availability and supply chain continuity. Each substitute maintains full RoHS3 compliance and MSL rating of 1 (Unlimited), meeting regulatory and environmental requirements equivalent to the original SMBJ150C.

The SMBJ150CA-TP variant from Micro Commercial Co offers the widest operating temperature range (-55°C ~ 175°C), providing additional thermal margin for applications requiring extended temperature performance. The SMBJ150CA-E3/5B from Vishay carries the TransZorb® series designation, indicating established performance in industrial transient suppression applications.

All substitute parts are available in tape and reel packaging suitable for automated assembly processes. Selection among these equivalents should be based on supplier availability, lead time requirements, and specific application temperature constraints.

Frequently Asked Questions (FAQ)

Q: Can SMBJ150CA variants be used as direct replacements for SMBJ150C?

A: Yes. All SMBJ150CA variants maintain the critical electrical specifications: 150V reverse standoff voltage, 2.5A peak pulse current, and 600W peak pulse power rating. The DO-214AA / SMB package geometry is identical, enabling direct PCB footprint compatibility.

Q: What is the significance of the clamping voltage difference (255.15V vs. 243V)?

A: The clamping voltage represents the maximum voltage across the diode during peak pulse conditions. The 243V clamping voltage of substitute parts is lower than the original 255.15V, providing slightly improved transient suppression performance. This difference is within normal manufacturing tolerance bands for TVS diodes and does not compromise circuit protection.

Q: Are there temperature range limitations when substituting?

A: The SMBJ150C operates from -65°C to 150°C. Substitute parts operate from -50°C to 150°C (MDD variant) or -55°C to 150°C (Diodes Inc., Vishay) or -55°C to 175°C (Micro Commercial). For applications requiring operation below -50°C, verify that the specific substitute part's lower temperature limit meets system requirements.

Q: Do all substitute parts use the same package?

A: Yes. All substitute parts use the DO-214AA (SMB) surface-mount package, ensuring identical PCB footprint compatibility and automated assembly compatibility with the original SMBJ150C.

Q: What is the MSL rating and why does it matter?

A: All parts carry MSL rating 1 (Unlimited), indicating no moisture sensitivity restrictions. Components can be stored indefinitely without desiccant packaging or time-limited shelf life constraints, simplifying inventory management and supply chain logistics.

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