SMCJ440C Equivalent & Substitute Parts

Part Overview

The SMCJ440C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 440V reverse standoff voltage rating and 748.65V maximum clamping voltage with 2.1A peak pulse current capability in a DO-214AB package. The SMCJ440C is currently listed as obsolete, making identification of equivalent substitute parts essential for ongoing design support and procurement continuity.

Substiute Parts

SMCJ440C

Littelfuse Inc.In Stock: 792SMCJ440C Datasheet

Current PartRFQ

SMCJ440CA

MeritekIn Stock: 3531SMCJ440CA Datasheet

DirectRFQ

SMCJ440CA

MeritekIn Stock: 3531SMCJ440CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMCJ440C is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Reverse standoff voltage: 440V (Typ)
• Peak pulse current: 2.1A
• Peak pulse power: 1500W
• Package type: DO-214AB (SMC)
• Mounting type: Surface Mount
• Bidirectional channels: 1
• Operating temperature range: -55°C to 150°C

The SMCJ440CA from Meritek meets all critical electrical specifications and mechanical requirements. While the clamping voltage differs (713V vs. 748.65V), both parts maintain the same reverse standoff voltage, peak pulse current, and power dissipation ratings. The identical package, mounting type, and temperature range ensure direct physical and functional compatibility in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The SMCJ440CA from Meritek is a direct functional equivalent to the obsolete SMCJ440C. Both components share identical reverse standoff voltage (440V), peak pulse current (2.1A), and power dissipation (1500W) specifications. The SMCJ440CA maintains full compliance with ROHS3 standards and carries an active product status, ensuring ongoing availability and supply chain continuity.

The primary distinction between these parts is the maximum clamping voltage specification: the SMCJ440C specifies 748.65V while the SMCJ440CA specifies 713V. Both values remain within acceptable operating parameters for general-purpose transient voltage suppression applications where the reverse standoff voltage is the primary design constraint.

The SMCJ440CA is packaged in Tape & Reel format, providing standard manufacturing compatibility. Both components utilize the DO-214AB (SMC) surface-mount package, ensuring identical PCB footprint and assembly process compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SMCJ440CA directly replace the SMCJ440C in existing designs?

A: Yes. Both components share identical reverse standoff voltage (440V), peak pulse current (2.1A), power dissipation (1500W), operating temperature range (-55°C to 150°C), and DO-214AB package specifications. The SMCJ440CA is a direct functional substitute.

Q: What is the significance of the clamping voltage difference between these parts?

A: The SMCJ440C specifies a maximum clamping voltage of 748.65V, while the SMCJ440CA specifies 713V. Both values are within the transient suppression range for 440V standoff applications. The clamping voltage determines the peak voltage presented to protected circuitry during a transient event. The lower clamping voltage of the SMCJ440CA provides slightly improved protection characteristics.

Q: Are there packaging differences between these parts?

A: Both components use the DO-214AB (SMC) surface-mount package with identical physical dimensions and PCB footprint. The SMCJ440CA is supplied in Tape & Reel packaging, which is standard for high-volume manufacturing operations.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SMCJ440C and SMCJ440CA are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings. Both carry EAR99 export classification and 8541.10.0080 HTSUS code.

Q: Why is the SMCJ440C listed as obsolete?

A: The SMCJ440C is no longer in active production by Littelfuse Inc. The SMCJ440CA from Meritek provides equivalent electrical and mechanical specifications for applications requiring this voltage and current rating.