SMBJ180 Equivalent & Substitute Parts

Part Overview

The SMBJ180 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. The device 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 SMBJ180 is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SMBJ180

LittelfuseIn Stock: 754SMBJ180 Datasheet

Current PartRFQ

SMBJ180A

MeritekIn Stock: 3932SMBJ180A Datasheet

DirectRFQ

SMBJ180A

MeritekIn Stock: 3932SMBJ180A Datasheet

DirectRFQ

SMBJ180A-TP

Micro Commercial CoIn Stock: 738SMBJ180A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMBJ180 are qualified based on the following critical parameters that must remain consistent:

• Voltage - Reverse Standoff: 180V (nominal)
• Package / Case: DO-214AA (SMB) surface mount
• Mounting Type: Surface Mount
• Type: Zener, Unidirectional
• Unidirectional Channels: 1
• Power - Peak Pulse: 600W
• Current - Peak Pulse (10/1000µs): 2.0A minimum
• Voltage - Clamping (Max) @ Ipp: within acceptable range for circuit protection

The substitute parts listed below meet these electrical and mechanical compatibility requirements and are available from active manufacturers or authorized distributors.

Parameter Comparison

Engineering Selection Recommendations

SMBJ180A (Meritek) and SMBJ180A-TP (Micro Commercial Co) are direct functional equivalents for the obsolete SMBJ180. Both substitute parts maintain the critical 180V reverse standoff voltage and DO-214AA package specification required for PCB compatibility.

SMBJ180A-TP is the manufacturer-recommended substitute, offering the closest electrical performance match with 2.1A peak pulse current identical to the original SMBJ180. This part is actively manufactured and carries ROHS3 compliance with extended operating temperature range to 175°C.

SMBJ180A (Meritek) provides an alternative with marginally lower clamping voltage (291.6V vs. 306.6V) and peak pulse current (2.06A vs. 2.1A), both within acceptable tolerance for general-purpose TVS applications. This part is also actively manufactured and ROHS3 compliant.

Both substitutes are available in production quantities and carry REACH compliance documentation. Selection between these options should be based on procurement availability, lead time, and packaging requirements (Tape & Reel vs. Bulk).

Frequently Asked Questions (FAQ)

Q: Can SMBJ180A and SMBJ180A-TP be used interchangeably with SMBJ180?

A: Yes. Both parts meet the core electrical specifications (180V standoff, 600W peak power, DO-214AA package) and are functionally equivalent for general-purpose transient voltage suppression applications. Differences in clamping voltage and peak pulse current are within acceptable operating margins for this device category.

Q: What is the difference between SMBJ180A (Meritek) and SMBJ180A-TP (Micro Commercial Co)?

A: Both parts share identical reverse standoff voltage (180V) and package specification (DO-214AA SMB). SMBJ180A-TP offers slightly higher peak pulse current (2.1A vs. 2.06A) and extended temperature range (-55°C to 175°C vs. -55°C to 150°C). SMBJ180A is supplied in Tape & Reel packaging, while SMBJ180A-TP is supplied in Bulk.

Q: Are there packaging differences between these substitutes?

A: All three parts use the same DO-214AA (SMB) surface-mount package and are PCB-compatible. Packaging format differs: SMBJ180 (original) and SMBJ180A-TP are supplied in Bulk, while SMBJ180A is supplied in Tape & Reel (TR). This affects handling and assembly processes but not electrical performance or board-level compatibility.

Q: What compliance certifications apply to these substitute parts?

A: All three parts are ROHS3 compliant. SMBJ180A and SMBJ180A-TP carry REACH Unaffected status. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Q: Why is the original SMBJ180 obsolete?

A: The SMBJ180 has been discontinued by Littelfuse. The active substitutes SMBJ180A and SMBJ180A-TP provide equivalent functionality and are recommended for new designs and ongoing procurement.