SMLJ18CA-TP Equivalent & Substitute Parts

Part Overview

The SMLJ18CA-TP is a transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This unidirectional Zener diode operates with an 18V reverse standoff voltage and provides 3000W peak pulse power dissipation in a DO-214AB (SMC) package. The part is active in production and RoHS3 compliant with unlimited moisture sensitivity rating.

Substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative packaging formats are required, or when application-specific performance characteristics demand higher current handling or power dissipation capabilities.

Substiute Parts

SMLJ18CA-TP

Micro Commercial CoIn Stock: 2914SMLJ18CA-TP Datasheet

Current PartRFQ

SMDJ18CA

Alpha & Omega Semiconductor Inc.In Stock: 23361SMDJ18CA Datasheet

DirectRFQ

5.0SMDJ18CA

MDE Semiconductor IncIn Stock: 182895.0SMDJ18CA Datasheet

SimilarRFQ

SMCJ18CA

EVVO SemiIn Stock: 125306SMCJ18CA Datasheet

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SMCJ18CA

EVVO SemiIn Stock: 125306SMCJ18CA Datasheet

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SMCJ18CA

EVVO SemiIn Stock: 125306SMCJ18CA Datasheet

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SMDJ18CA-T7

Littelfuse Inc.In Stock: 1498SMDJ18CA-T7 Datasheet

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SMLJ18CA

Bourns Inc.In Stock: 17496SMLJ18CA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMLJ18CA-TP are classified based on electrical parameter compatibility and mechanical interchangeability. The primary substitution criteria are:

• Voltage - Reverse Standoff: 18V (required match)
• Voltage - Clamping (Max) @ Ipp: 29.2V (required match)
• Voltage - Breakdown (Min): 20V (required match)
• Package / Case: DO-214AB, SMC (required match for PCB compatibility)
• Mounting Type: Surface Mount (required match)
• Current - Peak Pulse (10/1000µs): 102.8A or higher (acceptable if equal or greater)
• Power - Peak Pulse: 3000W or higher (acceptable if equal or greater)

Parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical specifications (voltage, current, power) and packaging, differing only in manufacturer or packaging format (Cut Tape vs. Tape & Reel).

Higher-Performance Alternatives: Parts with identical voltage specifications but higher current handling or power dissipation, suitable for applications requiring enhanced transient protection margin.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (Recommended for 1:1 Replacement):

SMDJ18CA (Alpha & Omega Semiconductor Inc.), SMDJ18CA-T7 (Littelfuse Inc.), and SMLJ18CA (Bourns Inc.) are direct electrical equivalents with identical voltage and current specifications. These parts maintain the 102.8A peak pulse current and 3000W power dissipation of the original SMLJ18CA-TP. Selection among these should be based on packaging format availability (Tape & Reel vs. Cut Tape) and supply chain considerations. All three are RoHS3 compliant and carry unlimited moisture sensitivity rating.

Higher-Performance Alternative:

5.0SMDJ18CA (MDE Semiconductor Inc) provides enhanced transient protection with 172A peak pulse current and 5000W power dissipation while maintaining identical voltage specifications. This part is suitable for applications requiring additional protection margin or higher transient energy absorption. It is RoHS3 compliant and carries unlimited moisture sensitivity rating.

Lower-Performance Alternative:

SMCJ18CA (EVVO Semi) operates at 51.4A peak pulse current and 1500W power dissipation. This part is suitable only for applications with reduced transient energy requirements and should not be used as a direct replacement in designs requiring the full 3000W protection capability.

All substitute parts are active in production status and comply with RoHS3 requirements. Temperature range variations should be evaluated against specific application operating conditions.

Frequently Asked Questions (FAQ)

Q: Can SMCJ18CA be used as a direct replacement for SMLJ18CA-TP?

A: SMCJ18CA is not a direct replacement. While it shares identical voltage specifications (18V reverse standoff, 29.2V clamping), it provides only 51.4A peak pulse current and 1500W power dissipation compared to the original 102.8A and 3000W. Use SMCJ18CA only if your application requires lower transient energy protection.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging is supplied in individual strips suitable for manual assembly or small-volume production. Tape & Reel packaging is wound on reels for automated pick-and-place assembly in high-volume manufacturing. Electrical performance is identical; selection depends on assembly process requirements.

Q: Is 5.0SMDJ18CA a suitable replacement if I need better protection?

A: Yes. 5.0SMDJ18CA maintains identical voltage specifications while providing 172A peak pulse current and 5000W power dissipation. This higher performance rating provides additional transient protection margin. Verify that your PCB layout and thermal management support the increased power dissipation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant. Moisture sensitivity level is unlimited (MSL 1) for all parts, indicating no special storage or handling requirements.

Q: What is the temperature range difference between SMLJ18CA-TP and substitute parts?

A: SMLJ18CA-TP operates from -55°C to 175°C. Most substitute parts operate from -55°C to 150°C, with SMDJ18CA-T7 extending to -65°C minimum. Verify that substitute parts meet your application's minimum and maximum operating temperature requirements.

Q: Can I use SMDJ18CA-T7 in place of SMLJ18CA-TP?

A: Yes. SMDJ18CA-T7 is a direct electrical equivalent with 102.7A peak pulse current (equivalent to 102.8A) and 3000W power dissipation. The primary difference is the extended lower temperature range (-65°C vs. -55°C). Both are RoHS3 compliant with identical package specifications.