SMBJ120CA-13 Equivalent & Substitute Parts

Part Overview

The SMBJ120CA-13 is a transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface mount applications. This component features a 120V reverse standoff voltage with a 193V maximum clamping voltage and 3.1A peak pulse current capability in a DO-214AA (SMB) package. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

SMBJ120CA-13

Diodes IncorporatedIn Stock: 807SMBJ120CA-13 Datasheet

Current PartRFQ

SMBJ120CA

MeritekIn Stock: 34486SMBJ120CA Datasheet

DirectRFQ

SMBJ120CA

MeritekIn Stock: 34486SMBJ120CA Datasheet

DirectRFQ

SMBJ120CA-TP

Micro Commercial CoIn Stock: 2383SMBJ120CA-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SMBJ120CA-13 is determined by strict equivalence across the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 120V
• Voltage - Breakdown (Min): 133V
• Voltage - Clamping (Max) @ Ipp: 193V
• Current - Peak Pulse (10/1000µs): 3.1A minimum
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA (SMB)
• Mounting Type: Surface Mount
• Type: Zener, Bidirectional

Parts meeting these electrical specifications and physical package requirements are classified as direct substitutes. Variations in manufacturer, RoHS compliance status, and operating temperature range do not disqualify a part from substitution provided all electrical and package parameters remain within specification.

Parameter Comparison

Engineering Selection Recommendations

SMBJ120CA (Meritek) is the primary substitute for SMBJ120CA-13. This part maintains identical electrical specifications with 3.11A peak pulse current (within tolerance of the original 3.1A specification) and achieves ROHS3 compliance. The part is currently in active production with substantial inventory availability (34,400 pcs), ensuring supply chain continuity.

SMBJ120CA-TP (Micro Commercial Co) is an alternative substitute with identical electrical performance and extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 150°C). This part is supplied in Tape & Reel packaging and carries ROHS3 compliance. It is suitable for applications requiring higher temperature operation within the specified range. Inventory availability is lower (2,364 pcs) compared to the Meritek option.

Both substitutes are electrically and mechanically compatible with the original SMBJ120CA-13 design. Selection between them should be based on packaging requirements (bulk versus tape & reel), temperature operating range needs, and supply availability.

Frequently Asked Questions (FAQ)

Q: Can SMBJ120CA (Meritek) be used as a direct replacement for SMBJ120CA-13?

A: Yes. The Meritek SMBJ120CA meets all critical electrical parameters (120V standoff, 133V breakdown minimum, 193V clamping maximum, 3.11A peak pulse current, 600W peak power) and uses the identical DO-214AA (SMB) package. The 0.01A difference in peak pulse current (3.11A vs 3.1A) is within normal manufacturing tolerance and does not affect circuit compatibility.

Q: What is the difference between SMBJ120CA and SMBJ120CA-TP?

A: Both parts are electrically equivalent with identical voltage and current ratings. The primary differences are: (1) SMBJ120CA-TP is supplied in Tape & Reel packaging while SMBJ120CA is supplied in bulk; (2) SMBJ120CA-TP has an extended operating temperature range of -55°C ~ 175°C compared to -55°C ~ 150°C for SMBJ120CA. Select SMBJ120CA-TP if your application requires higher temperature operation or automated assembly with tape & reel feeding.

Q: Are there RoHS compliance differences between the substitutes?

A: Yes. The original SMBJ120CA-13 is RoHS non-compliant. Both substitute parts (Meritek SMBJ120CA and Micro Commercial Co SMBJ120CA-TP) are ROHS3 compliant. If your application or regulatory requirements mandate RoHS compliance, either substitute is acceptable. If legacy non-compliant parts are required, neither substitute is suitable.

Q: Will these substitutes work in existing PCB designs without modification?

A: Yes. All three parts use the identical DO-214AA (SMB) package with the same pin configuration and footprint. No PCB layout changes are required for substitution.

Q: What inventory considerations should guide part selection?

A: Meritek SMBJ120CA offers the highest inventory availability (34,400 pcs), providing the best supply security for high-volume production. Micro Commercial Co SMBJ120CA-TP has lower availability (2,364 pcs) and should be selected only when its specific features (tape & reel packaging or extended temperature range) are required.