1SMB12CAT3 Equivalent & Substitute Parts

Part Overview

The 1SMB12CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 12V reverse standoff voltage with a 19.9V clamping voltage and 30.2A peak pulse current capability in the DO-214AA (SMB) package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production support.

Substiute Parts

1SMB12CAT3

onsemiIn Stock: 8701SMB12CAT3 Datasheet

Current PartRFQ

SMBJ12CA

EVVO SemiIn Stock: 112062SMBJ12CA Datasheet

DirectRFQ

SMBJ12CA

EVVO SemiIn Stock: 112062SMBJ12CA Datasheet

DirectRFQ

SMBJ12CA

EVVO SemiIn Stock: 112062SMBJ12CA Datasheet

DirectRFQ

SMBJ12CA-TR

STMicroelectronicsIn Stock: 15220SMBJ12CA-TR Datasheet

DirectRFQ

SMBJ12CA/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 952SMBJ12CA/54 Datasheet

DirectRFQ

SMBJ12CA-13-F

Diodes IncorporatedIn Stock: 3019SMBJ12CA-13-F Datasheet

SimilarRFQ

SMBJ12CA-HR

LittelfuseIn Stock: 1189SMBJ12CA-HR Datasheet

SimilarRFQ

SMBJ12CA-HRA

Littelfuse Inc.In Stock: 965SMBJ12CA-HRA Datasheet

SimilarRFQ

SMBJ12CA-TP

Micro Commercial CoIn Stock: 9169SMBJ12CA-TP Datasheet

SimilarRFQ

SMBJ12CAE3/TR13

Microchip TechnologyIn Stock: 3880SMBJ12CAE3/TR13 Datasheet

SimilarRFQ

TV06B120JB-G

Comchip TechnologyIn Stock: 1110TV06B120JB-G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 1SMB12CAT3 is determined by strict electrical and mechanical parameter matching:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 12V
• Voltage - Breakdown (Min): 13.3V
• Voltage - Clamping (Max) @ Ipp: 19.9V
• Current - Peak Pulse (10/1000µs): 30.2A (±1A tolerance acceptable)
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA, SMB
• Bidirectional Channels: 1
• Type: Zener

Substitute Categories:

Direct Equivalents (Identical Electrical Performance):

• SMBJ12CA (EVVO Semi) - Active status, ROHS3 compliant
• SMBJ12CA-TR (STMicroelectronics) - Active status, ROHS3 compliant, 31A peak pulse (within tolerance)
• SMBJ12CA/54 (Vishay) - Active status, RoHS non-compliant
• SMBJ12CA-13-F (Diodes Incorporated) - Active status, ROHS3 compliant
• SMBJ12CA-HR (Littelfuse) - Active status, ROHS3 compliant
• SMBJ12CA-HRA (Littelfuse) - Active status, ROHS3 compliant
• SMBJ12CA-TP (Micro Commercial Co) - Active status, ROHS3 compliant
• SMBJ12CAE3/TR13 (Microchip Technology) - Active status, ROHS3 compliant

All substitute parts maintain the same electrical specifications, package type, and functional performance as the original 1SMB12CAT3.

Parameter Comparison

Engineering Selection Recommendations

For New Designs and Production:

Select from active-status substitutes with ROHS3 compliance to ensure long-term availability and regulatory alignment. SMBJ12CA (EVVO Semi), SMBJ12CA-TR (STMicroelectronics), SMBJ12CA-13-F (Diodes Incorporated), SMBJ12CA-HR (Littelfuse), SMBJ12CA-HRA (Littelfuse), SMBJ12CA-TP (Micro Commercial Co), and SMBJ12CAE3/TR13 (Microchip Technology) all meet these criteria.

For Legacy System Support:

SMBJ12CA/54 (Vishay) provides electrical equivalence but carries RoHS non-compliant status, matching the original 1SMB12CAT3 compliance profile. This option is suitable only when RoHS compliance is not a design requirement.

Temperature Range Considerations:

SMBJ12CA-TP (Micro Commercial Co) extends the upper operating temperature to 175°C, providing additional thermal margin for high-temperature applications. SMBJ12CA-TR (STMicroelectronics) operates to -55°C minimum, compared to -65°C for other options, which may be relevant for extreme cold environments.

Peak Pulse Current:

SMBJ12CA-TR specifies 31A peak pulse current, which is within acceptable tolerance of the 30.2A specification and provides additional surge protection margin.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for 1SMB12CAT3?

A: Yes. All listed substitute parts maintain identical voltage specifications (12V reverse standoff, 19.9V clamping), current ratings (30.2A or 31A), power dissipation (600W), and package type (DO-214AA, SMB). They are electrically and mechanically interchangeable.

Q: What is the difference between the various Littelfuse options (SMBJ12CA-HR vs. SMBJ12CA-HRA)?

A: Both Littelfuse parts (SMBJ12CA-HR and SMBJ12CA-HRA) provide identical electrical performance and operating temperature range (-65°C ~ 150°C). The suffix designations indicate different product series within Littelfuse's portfolio (SMBJ-HR vs. SMBJ-HRA), but they are functionally equivalent for this application.

Q: Does the 1A difference in peak pulse current between SMBJ12CA-TR (31A) and other substitutes (30.2A) affect compatibility?

A: No. The 31A specification in SMBJ12CA-TR exceeds the original 30.2A requirement and provides additional surge protection capability. This represents an improvement in performance margin and does not compromise compatibility.

Q: Why should I choose a ROHS3-compliant substitute over the RoHS non-compliant option?

A: ROHS3-compliant parts (SMBJ12CA, SMBJ12CA-TR, SMBJ12CA-13-F, SMBJ12CA-HR, SMBJ12CA-HRA, SMBJ12CA-TP, SMBJ12CAE3/TR13) meet current regulatory requirements and ensure long-term supply chain viability. RoHS non-compliant parts may face restrictions in certain markets and applications.

Q: Are there any temperature range limitations I should consider?

A: Most substitutes operate across -65°C ~ 150°C or -55°C ~ 150°C. SMBJ12CA-TP extends to 175°C maximum, offering additional thermal headroom. If your application requires operation below -55°C, select SMBJ12CA, SMBJ12CA-HR, SMBJ12CA-HRA, or SMBJ12CAE3/TR13, which all support -65°C minimum.

Q: Can I mix different manufacturers' parts in the same production batch?

A: Yes. All substitute parts meet the same electrical and mechanical specifications. However, for consistency in supply chain management and quality control, it is common practice to standardize on a single manufacturer per design revision.

Q: What packaging options are available for these substitutes?

A: All substitutes are supplied in DO-214AA (SMB) surface-mount package. Packaging formats vary by manufacturer and distributor (Cut Tape, Digi-Reel, Tape & Reel), but the component footprint and pinout remain identical across all options.