SMCJ350 Equivalent & Substitute Parts

Part Overview

The SMCJ350 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 350V reverse standoff voltage rating and 595.35V maximum clamping voltage with 2.6A peak pulse current capability in a surface-mount DO-214AB package. The SMCJ350 is classified as obsolete, necessitating identification of active substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Substiute Parts

SMCJ350

Littelfuse Inc.In Stock: 747SMCJ350 Datasheet

Current PartRFQ

SMCJ350A

MeritekIn Stock: 95141SMCJ350A Datasheet

MFR RecommendedRFQ

SMCJ350A

MeritekIn Stock: 95141SMCJ350A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMCJ350 is determined by strict equivalence across the following critical parameters:

• Reverse standoff voltage: 350V (Typ)
• Peak pulse current rating: 2.6A
• Package type: DO-214AB (SMC) surface mount
• Device type: Unidirectional Zener TVS diode
• Operating temperature range: -55°C to 150°C minimum

The SMCJ350A from Meritek meets all substitution criteria. While the clamping voltage differs (567V versus 595.35V), this represents a tighter clamping specification that remains within the functional requirements for general-purpose transient suppression. The reverse standoff voltage, peak pulse current, package configuration, and temperature range are identical, establishing direct functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

The SMCJ350A from Meritek is the direct substitute for the obsolete SMCJ350 from Littelfuse Inc. Both components maintain identical reverse standoff voltage, peak pulse current, package configuration, and operating temperature specifications. The SMCJ350A carries active product status with 95,100 units in stock, ensuring production availability. Both parts are ROHS3 compliant with MSL 1 rating, meeting environmental and moisture sensitivity requirements. The SMCJ350A is supplied in Tape & Reel packaging, suitable for automated assembly processes. Selection of the SMCJ350A eliminates obsolescence risk while maintaining full electrical and mechanical compatibility with existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the SMCJ350A directly replace the SMCJ350 in existing designs?

A: Yes. The SMCJ350A maintains identical reverse standoff voltage (350V), peak pulse current (2.6A), operating temperature range (-55°C to 150°C), and DO-214AB package configuration. Direct PCB-level substitution is supported without design modification.

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

A: The SMCJ350A exhibits a lower maximum clamping voltage (567V versus 595.35V). This represents a tighter clamping specification that provides enhanced transient suppression performance. For general-purpose applications, this characteristic is functionally equivalent or superior to the original specification.

Q: Are there compliance or certification differences between the two parts?

A: Both the SMCJ350 and SMCJ350A are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. No compliance or certification differences exist between the two components.

Q: What packaging options are available for the SMCJ350A?

A: The SMCJ350A is supplied in Tape & Reel (TR) packaging, optimized for high-volume automated assembly. This packaging format is standard for surface-mount DO-214AB devices and is compatible with standard pick-and-place equipment.

Q: Why is the SMCJ350 classified as obsolete?

A: The SMCJ350 has reached end-of-life status with Littelfuse Inc. The SMCJ350A from Meritek provides functional equivalence with active production status and assured supply chain availability.