Equivalent & Substitute Parts for SMCJ18C Transient Voltage Suppressors (TVS)

Part Overview

The SMCJ18C from Taiwan Semiconductor Corporation is a Transient Voltage Suppressor (TVS) diode designed for general-purpose electronic applications requiring protection against transient voltages. Classified under the Zener type, this part features bidirectional protection, a standoff voltage of 18V, a minimum breakdown voltage of 20V, and a clamping voltage of 32.2V at a peak pulse current of 48A. The part is offered in a surface mount DO-214AB (SMC) package, is ROHS3 compliant, REACH unaffected, and is currently active with available inventory.

The identification and selection of substitute models is necessary to support ongoing and future production, ensure design continuity in case of supply chain changes, and allow for compatible drop-in replacements strictly within the defined electrical and mechanical parameters.

Substiute Parts

SMCJ18C

Taiwan Semiconductor CorporationIn Stock: 957SMCJ18C 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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Key Parameters

Substitute Part Grouping Explanation

Substitution is determined strictly by matching the primary device function in the Transient Voltage Suppressor (TVS) category, identical or compatible standoff, breakdown, clamping voltages, current and power ratings, bidirectional channel count, surface mount DO-214AB (SMC) package, and equivalent operating temperature range. Additional parameters such as RoHS compliance, product status, and mounting style are matched exactly. Only parts with these aligned characteristics are considered as substitutes.

Parameter Comparison

Engineering Selection Recommendations

Selection between SMCJ18C and its substitutes can be based on part status and environmental compliance. Both SMCJ18C and SMCJ18CA are active parts and ROHS3 compliant, meeting requirements for use in new and ongoing designs. Certifications such as REACH and ECCN are provided for inventory management and regulatory tracking. No differing compliance or qualification details are present within the provided parameters.

Frequently Asked Questions (FAQ)

Q1: What electrical characteristics must match for a TVS diode to be considered a substitute?
A1: Substitute selection requires identical or compatible voltage standoff, minimum breakdown voltage, clamping voltage, peak pulse current, peak pulse power, and bidirectional channel rating.

Q2: Is package compatibility mandatory for substitution?
A2: Yes. Both primary and substitute TVS diodes must use the DO-214AB (SMC) package to ensure mechanical compatibility and straightforward replacement in surface mount designs.

Q3: Are both SMCJ18C and SMCJ18CA suitable for the same applications?
A3: Both parts are specified for general-purpose transient voltage suppression applications.

Q4: How does compliance status affect substitution?
A4: Both components are ROHS3 compliant, supporting use in applications requiring lead-free and hazardous substance controls.

Q5: Can substitute parts be used interchangeably in the same operating temperature range?
A5: Yes. The specified operating temperature range for both SMCJ18C and SMCJ18CA is -55°C ~ 150°C (TJ), satisfying design requirements for the thermal environment.