SMCJ220 Equivalent & Substitute Parts

Part Overview

The SMCJ220 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 220V reverse standoff voltage rating and a maximum clamping voltage of 373.8V at peak pulse current. The SMCJ220 is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

Substiute Parts

SMCJ220

Littelfuse Inc.In Stock: 905SMCJ220 Datasheet

Current PartRFQ

SMCJ220A

MeritekIn Stock: 5562SMCJ220A Datasheet

DirectRFQ

SMCJ220A

MeritekIn Stock: 5562SMCJ220A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMCJ220 is determined by strict equivalence across the following critical parameters:

• Reverse standoff voltage: 220V (nominal)
• Peak pulse current rating: 4.2A
• Peak pulse power dissipation: 1500W
• Package type: DO-214AB (SMC) surface mount
• Unidirectional channel configuration: 1 channel
• Operating temperature range: -55°C to 150°C minimum

The SMCJ220A from Meritek meets these core electrical and mechanical requirements. While the clamping voltage differs (356V versus 373.8V), both parts maintain the same reverse standoff voltage, peak pulse current, power rating, and physical package specification, establishing functional equivalence for general-purpose TVS applications.

Parameter Comparison

Engineering Selection Recommendations

The SMCJ220A from Meritek is a direct functional substitute for the obsolete SMCJ220 from Littelfuse Inc. Both components are ROHS3 compliant and carry MSL Level 1 rating, indicating equivalent environmental and regulatory compliance. The SMCJ220A maintains active product status, ensuring ongoing availability and supply chain continuity.

The primary electrical difference is the maximum clamping voltage: the SMCJ220A clamps at 356V compared to the SMCJ220's 373.8V. This represents a lower clamping voltage, which provides tighter voltage regulation during transient suppression events. For applications where the original SMCJ220 clamping specification was not a critical design constraint, the SMCJ220A offers equivalent protection performance with improved availability.

Frequently Asked Questions (FAQ)

Q: Can the SMCJ220A replace the SMCJ220 in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (220V), peak pulse current (4.2A), power dissipation (1500W), operating temperature range (-55°C to 150°C), and DO-214AB package specification. The SMCJ220A's lower clamping voltage (356V vs. 373.8V) provides equivalent or superior transient suppression for general-purpose applications.

Q: What is the significance of the different clamping voltages?

A: Clamping voltage determines the peak voltage level during transient suppression. The SMCJ220A's 356V clamping voltage is lower than the SMCJ220's 373.8V, resulting in tighter voltage regulation. This difference is within acceptable tolerance for general-purpose TVS applications where both parts meet the 220V reverse standoff specification.

Q: Are there any compliance or certification differences?

A: No. Both the SMCJ220 and SMCJ220A are ROHS3 compliant with MSL Level 1 rating. The SMCJ220A carries additional REACH Unaffected status. Both components meet equivalent environmental and regulatory requirements.

Q: Is the DO-214AB package identical between both parts?

A: Yes. Both components use the DO-214AB (SMC) surface-mount package, ensuring mechanical and electrical compatibility on PCB layouts designed for the SMCJ220.

Q: Why is the SMCJ220 listed as obsolete?

A: The SMCJ220 from Littelfuse Inc. has reached end-of-life status. The SMCJ220A from Meritek provides functional equivalence with active product status and available inventory for new designs and legacy system support.