SMCJ43C Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The SMCJ43C is a 1500W bidirectional transient voltage suppressor (TVS) diode manufactured by Taiwan Semiconductor Corporation. This surface mount component operates in the 43V reverse standoff voltage class and provides transient protection for general-purpose applications. The device is specified with a 76.7V maximum clamping voltage at peak pulse current and features a DO-214AB (SMC) package footprint. The SMCJ43C maintains active product status with full RoHS3 compliance and REACH unaffected designation. Identification of equivalent substitute parts becomes necessary when primary inventory is unavailable or when alternative sourcing is required while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Substiute Parts

SMCJ43C

Taiwan Semiconductor CorporationIn Stock: 899SMCJ43C Datasheet

Current PartRFQ

SMCJ43CA

MeritekIn Stock: 38421SMCJ43CA Datasheet

SimilarRFQ

SMCJ43CA

MeritekIn Stock: 38421SMCJ43CA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMCJ43C are identified based on strict electrical and mechanical parameter alignment within the SMCJ series classification. The substitution criteria are defined by the following parameters:

Critical Matching Parameters:

• Reverse standoff voltage: 43V (Typ)
• Breakdown voltage minimum: 47.8V
• Peak pulse power rating: 1500W
• Package type: DO-214AB (SMC) surface mount
• Bidirectional channel configuration: 1 channel
• Operating temperature range: -55°C to 150°C
• Zener diode type classification

Allowable Variation Parameters:

• Clamping voltage (Max) @ Ipp: Substitutes may vary within the same voltage class
• Peak pulse current (10/1000µs): Substitutes rated at or above the specified 20A threshold

The SMCJ43CA from Meritek qualifies as a direct substitute based on matching all critical parameters while maintaining compatibility with the original application requirements.

Parameter Comparison

Engineering Selection Recommendations

SMCJ43C (Taiwan Semiconductor Corporation)

Primary selection when available. Active product status with established supply chain. Full RoHS3 compliance and REACH unaffected designation. Specified clamping voltage of 76.7V at peak pulse current provides defined transient suppression performance. ECCN classification EAR99 and HTSUS code 8541.10.0080 apply for regulatory and trade documentation purposes.

SMCJ43CA (Meritek)

Direct substitute when SMCJ43C inventory is unavailable. Maintains identical reverse standoff voltage (43V), breakdown voltage (47.8V), and peak pulse power rating (1500W). Clamping voltage specification of 69.4V is lower than the primary part, resulting in improved transient suppression margin. Peak pulse current rating of 21.61A exceeds the 20A specification, providing additional current handling capacity. Both parts share DO-214AB (SMC) package compatibility, identical operating temperature range (-55°C to 150°C), and equivalent compliance certifications (RoHS3 Compliant, REACH Unaffected). Moisture Sensitivity Level (MSL) rating of 1 (Unlimited) indicates no moisture-related handling restrictions. ECCN and HTSUS classifications are identical.

Selection between these parts is determined by availability and inventory requirements. Both parts satisfy the electrical and mechanical requirements for general-purpose transient voltage suppression applications within the specified parameter envelope.

Frequently Asked Questions (FAQ)

Q: Can SMCJ43CA replace SMCJ43C in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (43V), breakdown voltage (47.8V), peak pulse power (1500W), operating temperature range (-55°C to 150°C), and DO-214AB (SMC) package footprint. The SMCJ43CA provides lower clamping voltage (69.4V vs 76.7V) and higher peak pulse current (21.61A vs 20A), both of which are compatible with circuit requirements for the SMCJ43C.

Q: What is the significance of the clamping voltage difference between SMCJ43C and SMCJ43CA?

A: The SMCJ43C specifies 76.7V maximum clamping voltage at peak pulse current, while SMCJ43CA specifies 69.4V. Lower clamping voltage indicates faster transient suppression and reduced voltage overshoot during transient events. This difference is within the acceptable parameter range for the 43V voltage class and does not prevent substitution.

Q: Are the package dimensions identical between SMCJ43C and SMCJ43CA?

A: Both parts use the DO-214AB (SMC) surface mount package, which defines identical footprint, lead spacing, and mounting characteristics. Direct PCB layout compatibility is maintained without modification.

Q: What compliance certifications apply to both substitute parts?

A: Both SMCJ43C and SMCJ43CA are RoHS3 Compliant and REACH Unaffected. Both carry ECCN classification EAR99 and HTSUS code 8541.10.0080 for regulatory and trade purposes.

Q: Is there a moisture sensitivity concern with SMCJ43CA?

A: No. SMCJ43CA carries Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), indicating no moisture-related handling or storage restrictions. Standard component handling procedures apply.

Q: What is the basis for substitution between these parts?

A: Substitution is based on matching critical electrical parameters (reverse standoff voltage, breakdown voltage, peak pulse power), identical package type (DO-214AB/SMC), matching operating temperature range, and equivalent compliance certifications. Both parts are classified as bidirectional Zener TVS diodes within the SMCJ series.