SMCJ45C Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The SMCJ45C is a 1500W bidirectional transient voltage suppressor (TVS) diode manufactured by Taiwan Semiconductor Corporation. This surface mount component operates at 45V reverse standoff voltage with an 80.3V maximum clamping voltage and 19A peak pulse current. The device is classified as Active product status and is designed for general-purpose transient voltage suppression applications requiring surface mount packaging in the DO-214AB (SMC) form factor. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained within the specified parameter ranges.

Substiute Parts

SMCJ45C

Taiwan Semiconductor CorporationIn Stock: 829SMCJ45C Datasheet

Current PartRFQ

SMCJ45CA

MDDIn Stock: 2251SMCJ45CA Datasheet

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SMCJ45CA

MDDIn Stock: 2251SMCJ45CA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMCJ45C are identified based on strict equivalence of the following critical parameters:

Mandatory Matching Parameters:

• Voltage - Reverse Standoff (Typ): 45V
• Voltage - Breakdown (Min): 50V
• Power - Peak Pulse: 1500W
• Mounting Type: Surface Mount
• Package / Case: DO-214AB, SMC
• Type: Zener
• Bidirectional Channels: 1
• Applications: General Purpose

Allowable Variation Parameters:

• Voltage - Clamping (Max) @ Ipp: Substitute must not exceed the main part specification
• Current - Peak Pulse (10/1000µs): Substitute must meet or exceed the main part specification
• Operating Temperature Range: Substitute must cover the main part range or be compatible with application requirements
• RoHS and REACH Compliance: Substitute must maintain equivalent compliance status

The SMCJ45CA qualifies as a substitute based on matching all mandatory parameters while maintaining compatible electrical performance within the allowed variation ranges.

Parameter Comparison

Engineering Selection Recommendations

Both the SMCJ45C and SMCJ45CA maintain Active product status and are ROHS3 compliant with REACH Unaffected designation, ensuring regulatory compliance for current manufacturing and deployment. The SMCJ45CA demonstrates superior peak pulse current capability (20.6A versus 19A) while maintaining identical power dissipation and voltage standoff specifications. The SMCJ45CA exhibits a lower maximum clamping voltage (72.7V versus 80.3V), which provides improved transient suppression performance in applications where lower clamping voltage is beneficial. The SMCJ45CA operating temperature minimum of -50°C is within the application range for most general-purpose transient suppression circuits; however, applications requiring operation below -50°C must use the SMCJ45C. Both devices are packaged identically in DO-214AB (SMC) surface mount form factor and are suitable for direct board-level substitution where thermal and temperature requirements are compatible.

Frequently Asked Questions (FAQ)

Q: Can SMCJ45CA be used as a direct replacement for SMCJ45C in all applications?

A: The SMCJ45CA is electrically compatible with the SMCJ45C for applications operating within the temperature range of -50°C to 150°C. Applications requiring operation below -50°C must use the SMCJ45C. Both devices share identical reverse standoff voltage, breakdown voltage, power rating, and package specifications.

Q: What is the significance of the lower clamping voltage in the SMCJ45CA?

A: The SMCJ45CA maximum clamping voltage of 72.7V is lower than the SMCJ45C specification of 80.3V. This parameter indicates the voltage level at which the TVS diode clamps transient overvoltage events. A lower clamping voltage provides more aggressive transient suppression and may offer superior circuit protection in applications sensitive to voltage spikes.

Q: Are both parts available in the same packaging format?

A: Yes. Both SMCJ45C and SMCJ45CA are supplied in Tape & Reel (TR) packaging and use identical DO-214AB (SMC) surface mount package geometry, enabling direct board-level substitution without PCB redesign.

Q: Do both parts meet current regulatory compliance requirements?

A: Yes. Both the SMCJ45C and SMCJ45CA are ROHS3 compliant and REACH Unaffected, meeting current regulatory requirements for electronic component manufacturing and deployment.

Q: What is the difference in peak pulse current capability?

A: The SMCJ45CA is rated for 20.6A peak pulse current compared to the SMCJ45C rating of 19A. Both devices maintain the same 1500W peak pulse power rating. The higher current rating of the SMCJ45CA indicates enhanced transient handling capability within the same power envelope.

Q: How should I select between these two parts for a new design?

A: Selection is based on operating temperature requirements and clamping voltage performance. For applications operating at -55°C or below, use SMCJ45C. For applications within -50°C to 150°C range, either part is suitable; SMCJ45CA offers lower clamping voltage and higher peak pulse current. Verify that the lower clamping voltage of SMCJ45CA is compatible with downstream circuit protection requirements.