SMCJ300C Equivalent & Substitute Parts

Part Overview

The SMCJ300C is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This component features a 300V reverse standoff voltage rating and 510.3V maximum clamping voltage with 3.1A peak pulse current capability in a DO-214AB (SMC) package.

The SMCJ300C is classified as obsolete. Substitute parts are necessary to maintain design continuity and ensure component availability for new production and field replacements. Equivalent alternatives must maintain compatibility across electrical performance parameters, mechanical packaging, and environmental operating conditions.

Substiute Parts

SMCJ300C

Littelfuse Inc.In Stock: 997SMCJ300C Datasheet

Current PartRFQ

SMCJ300CA

Littelfuse Inc.In Stock: 3887SMCJ300CA Datasheet

MFR RecommendedRFQ

SMCJ1.5KE350CA-TP

Micro Commercial CoIn Stock: 788SMCJ1.5KE350CA-TP Datasheet

MFR RecommendedRFQ

SMCJ300CA

Littelfuse Inc.In Stock: 3887SMCJ300CA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMCJ300C are qualified based on the following electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

• Reverse standoff voltage: 300V (nominal)
• Package type: DO-214AB (SMC) surface mount
• Bidirectional channel configuration: 1 channel
• Zener diode type classification
• Peak pulse power rating: 1500W minimum
• Operating temperature range: minimum -55°C to 150°C

Secondary Compatibility Parameters:

• Voltage breakdown minimum: 317.7V to 335V range
• Voltage clamping maximum: 482V to 510.3V range
• Peak pulse current: 3.1A to 3.2A range
• RoHS3 compliance and EAR99 classification

Parts meeting these criteria are electrically and mechanically interchangeable within the specified application envelope.

Parameter Comparison

Engineering Selection Recommendations

SMCJ300CA (Littelfuse Inc.) - Primary Substitute

The SMCJ300CA is the manufacturer-recommended direct replacement for the obsolete SMCJ300C. Both parts are manufactured by Littelfuse Inc. within the SMCJ series and share identical reverse standoff voltage, peak pulse current, and power ratings. The SMCJ300CA maintains active product status with higher inventory availability (3832 pcs in stock). Clamping voltage is 486V compared to 510.3V in the original part, representing a 4.8% reduction within acceptable design margins for general-purpose transient suppression. Operating temperature range is identical (-55 to 150°C). REACH compliance status is documented as unaffected. This part is suitable for direct PCB substitution without design modification.

SMCJ1.5KE350CA-TP (Micro Commercial Co) - Secondary Substitute

The SMCJ1.5KE350CA-TP provides electrical compatibility with extended operating temperature capability (-55 to 175°C). Peak pulse current is 3.2A, marginally higher than the 3.1A specification. Clamping voltage is 482V, representing a 5.6% reduction from the original specification. This part is manufactured by Micro Commercial Co and maintains active product status with RoHS3 compliance and EAR99 classification. The extended temperature range provides additional design margin for applications requiring higher thermal performance. Mechanical compatibility is confirmed through identical DO-214AB (SMC) packaging.

Both substitute parts maintain compliance certifications and are suitable for applications where the SMCJ300C was originally specified.

Frequently Asked Questions (FAQ)

Q: Can SMCJ300CA be used as a direct replacement for SMCJ300C without PCB modification?

A: Yes. Both parts share identical reverse standoff voltage (300V), peak pulse current (3.1A), power rating (1500W), operating temperature range (-55 to 150°C), and DO-214AB (SMC) package configuration. The clamping voltage difference (486V vs 510.3V) is within acceptable tolerance for general-purpose transient suppression applications.

Q: What is the primary difference between SMCJ300CA and SMCJ1.5KE350CA-TP?

A: The primary differences are manufacturer (Littelfuse vs Micro Commercial Co) and operating temperature range (-55 to 150°C vs -55 to 175°C). Electrical parameters are comparable: both maintain 300V reverse standoff voltage, 1500W peak pulse power, and DO-214AB packaging. Clamping voltages are 486V and 482V respectively, both within 5.6% of the original 510.3V specification.

Q: Are all three parts (SMCJ300C, SMCJ300CA, SMCJ1.5KE350CA-TP) mechanically identical?

A: Yes. All three parts use the DO-214AB (SMC) surface-mount package with identical pinout and footprint. PCB layout and reflow soldering parameters remain unchanged across all three parts.

Q: Why is the SMCJ300C classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Littelfuse Inc. The SMCJ300CA serves as the active replacement within the same product series and manufacturer line.

Q: Which substitute should be selected for new designs?

A: The SMCJ300CA is the recommended choice for new designs due to manufacturer continuity (Littelfuse Inc.), active product status, and higher inventory availability. The SMCJ1.5KE350CA-TP is suitable when extended operating temperature range (-55 to 175°C) is required.

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

A: All three parts maintain RoHS3 compliance and EAR99 classification. The SMCJ300CA and SMCJ1.5KE350CA-TP both document REACH compliance status as unaffected. Moisture sensitivity level (MSL) is rated as 1 (Unlimited) for all parts.