SMCJ30C Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The SMCJ30C is a 1500W bidirectional transient voltage suppressor (TVS) diode manufactured by Taiwan Semiconductor Corporation. This surface mount component operates at a 30V reverse standoff voltage with a 53.5V maximum clamping voltage and 29A peak pulse current capability. The device is designed for general-purpose transient protection applications and is classified as Active product status with full RoHS3 and REACH compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges for this TVS diode category.

Substiute Parts

SMCJ30C

Taiwan Semiconductor CorporationIn Stock: 1127SMCJ30C Datasheet

Current PartRFQ

SMCJ30CA

MDDIn Stock: 26201SMCJ30CA Datasheet

SimilarRFQ

SMCJ30CA

MDDIn Stock: 26201SMCJ30CA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMCJ30C is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

• Voltage - Reverse Standoff (Typ): 30V
• Voltage - Breakdown (Min): 33.3V
• Package / Case: DO-214AB (SMC) surface mount
• Power - Peak Pulse: 1500W
• Type: Zener, Bidirectional
• RoHS3 Compliance: Required
• Product Status: Active

Allowable Variation Parameters:

• Voltage - Clamping (Max) @ Ipp: Substitute must not exceed main part specification
• Current - Peak Pulse (10/1000µs): Substitute must meet or exceed main part specification
• Operating Temperature Range: Substitute must cover or exceed main part range
• Manufacturer: Different manufacturers permitted if all electrical and mechanical parameters align

The SMCJ30CA from MDD qualifies as a direct substitute based on matching reverse standoff voltage, breakdown voltage, package type, power rating, and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

SMCJ30C (Taiwan Semiconductor Corporation) is the primary component specification. This part maintains Active product status with full RoHS3 compliance and REACH unaffected designation. The device is suitable for applications requiring the specified 53.5V maximum clamping voltage and operates across the full -55 to 150°C temperature range.

SMCJ30CA (MDD) qualifies as a direct substitute when the following conditions are met:

1. Application operating temperature does not fall below -50°C (narrower temperature range than main part)
2. Lower clamping voltage of 48.4V is acceptable for the circuit design
3. Higher peak pulse current capability (31A versus 29A) provides additional margin

Both parts maintain identical reverse standoff voltage, breakdown voltage, package configuration, power rating, and regulatory compliance status. Selection between these parts should be based on application-specific temperature requirements and clamping voltage tolerance.

Frequently Asked Questions (FAQ)

Q: Can SMCJ30CA replace SMCJ30C in all applications?

A: SMCJ30CA is electrically compatible when the application does not require operation below -50°C and when the lower clamping voltage of 48.4V is acceptable. The substitute provides higher peak pulse current (31A), which is advantageous for transient protection margin.

Q: What is the significance of the different clamping voltages (53.5V vs 48.4V)?

A: Clamping voltage determines the maximum voltage spike that reaches the protected circuit during a transient event. SMCJ30C clamps at 53.5V while SMCJ30CA clamps at 48.4V. Selection depends on the protected circuit's voltage tolerance specifications.

Q: Are both parts suitable for the same PCB layout and footprint?

A: Yes. Both SMCJ30C and SMCJ30CA use identical DO-214AB (SMC) surface mount packaging, ensuring mechanical and electrical compatibility on the same PCB layout without design modifications.

Q: What compliance certifications apply to both parts?

A: Both parts are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: How do the peak pulse current ratings affect substitution?

A: SMCJ30CA provides 31A peak pulse current compared to SMCJ30C's 29A. The higher rating in the substitute part provides additional transient protection capability without reducing performance margins.

Q: Is temperature range a limiting factor for substitution?

A: Yes. SMCJ30CA operates from -50 to 150°C while SMCJ30C operates from -55 to 150°C. Applications requiring operation below -50°C must use SMCJ30C. Applications within -50 to 150°C range can use either part.