SMBJ180C Equivalent & Substitute Parts

Part Overview

The SMBJ180C 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 180V reverse standoff voltage with a 306.6V maximum clamping voltage and 2.1A peak pulse current capability in a DO-214AA (SMB) package. The SMBJ180C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	180	V
Voltage - Breakdown (Min)	190.35	V
Voltage - Clamping (Max) @ Ipp	306.6	V
Current - Peak Pulse (10/1000µs)	2.1	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C
Package / Case	DO-214AA (SMB)	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SMBJ180C is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 180V
Voltage - Clamping (Max) @ Ipp: Must not exceed 306.6V to maintain circuit protection integrity
Current - Peak Pulse (10/1000µs): Minimum 2.06A to 2.1A
Power - Peak Pulse: 600W
Package / Case: DO-214AA (SMB) surface mount
Type: Zener diode, bidirectional, single channel
Applications: General Purpose

The identified substitute parts maintain these core electrical and mechanical specifications within acceptable engineering tolerances for direct replacement in the same circuit application.

Parameter Comparison

Parameter	SMBJ180C (Littelfuse)	SMBJ180CA (Meritek)	SMBJ180CA-TP (Micro Commercial Co)
Voltage - Reverse Standoff (Typ)	180V	180V	180V
Voltage - Breakdown (Min)	190.35V	200V	201V
Voltage - Clamping (Max) @ Ipp	306.6V	291.6V	292V
Current - Peak Pulse (10/1000µs)	2.1A	2.06A	2.1A
Power - Peak Pulse	600W	600W	600W
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-55 to 175°C
Package / Case	DO-214AA (SMB)	DO-214AA (SMB)	DO-214AA (SMB)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Type	Zener	Zener	Zener
Bidirectional Channels	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

Both SMBJ180CA (Meritek) and SMBJ180CA-TP (Micro Commercial Co) are active, in-production alternatives to the obsolete SMBJ180C. Selection between these substitutes is based on the following criteria:

SMBJ180CA (Meritek): This part maintains full electrical equivalence with a clamping voltage of 291.6V, which is lower than the original 306.6V specification. This provides enhanced protection margin. The part is ROHS3 compliant and REACH unaffected. Operating temperature range is -55 to 150°C. Packaging is supplied as Tape & Reel (TR).

SMBJ180CA-TP (Micro Commercial Co): This part matches the original peak pulse current specification at 2.1A and provides a clamping voltage of 292V. It is ROHS3 compliant and REACH unaffected. The extended operating temperature range of -55 to 175°C provides additional thermal margin for high-temperature applications. Packaging is supplied as Bulk.

Both substitutes are electrically and mechanically compatible with the original SMBJ180C in DO-214AA (SMB) surface-mount applications. Selection should be based on packaging requirements (Tape & Reel versus Bulk) and thermal operating range needs for the specific application.

Frequently Asked Questions (FAQ)

Q: Can SMBJ180CA and SMBJ180CA-TP be used interchangeably with SMBJ180C?

A: Yes. Both parts maintain the critical electrical parameters: 180V reverse standoff voltage, 600W peak pulse power, and compatible peak pulse current ratings (2.06A to 2.1A). Both are packaged in DO-214AA (SMB) surface mount and are suitable for general-purpose TVS applications.

Q: What is the difference in clamping voltage between the original and substitutes?

A: The SMBJ180C specifies a maximum clamping voltage of 306.6V. The SMBJ180CA and SMBJ180CA-TP both clamp at approximately 291-292V, which is lower. This lower clamping voltage provides improved transient suppression performance and does not compromise circuit compatibility.

Q: Are there temperature range differences I should consider?

A: The original SMBJ180C operates from -65 to 150°C. Both substitutes operate from -55 to 150°C, representing a 10°C reduction in minimum operating temperature. The SMBJ180CA-TP extends the maximum to 175°C, providing additional thermal headroom for high-temperature environments.

Q: What packaging options are available?

A: SMBJ180CA is supplied in Tape & Reel (TR) format, suitable for automated assembly. SMBJ180CA-TP is supplied in Bulk packaging. Select based on your production assembly method and inventory management requirements.

Q: Are both substitutes RoHS and REACH compliant?

A: Yes. Both SMBJ180CA and SMBJ180CA-TP are ROHS3 compliant. SMBJ180CA is REACH unaffected, and SMBJ180CA-TP is also REACH unaffected, meeting environmental and regulatory requirements.

Q: Which substitute should I choose for new designs?

A: Both parts are active and in production. Choose SMBJ180CA for Tape & Reel packaging in standard temperature applications. Choose SMBJ180CA-TP for Bulk packaging or applications requiring extended temperature range to 175°C.

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