Equivalent & Substitute Parts for SMLJ43CE3/TR13

Part Overview

The SMLJ43CE3/TR13 is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, rated for 43V reverse standoff with a 76.7V clamping voltage. This surface mount component in DO-214AB packaging is designed for general-purpose transient protection in electronic circuits. The part maintains Active product status with full ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are necessary to address supply chain flexibility, alternative sourcing, performance optimization for specific applications, and manufacturing procurement options.

Substiute Parts

SMLJ43CE3/TR13

Microchip TechnologyIn Stock: 975SMLJ43CE3/TR13 Datasheet

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SMC3K43CA-M3/57

Vishay General Semiconductor - Diodes DivisionIn Stock: 17735SMC3K43CA-M3/57 Datasheet

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SMCJ43CA

MeritekIn Stock: 38421SMCJ43CA Datasheet

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SMCJ43CA

MeritekIn Stock: 38421SMCJ43CA Datasheet

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SMCJ43CA

MeritekIn Stock: 38421SMCJ43CA Datasheet

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SMCJ43CA-13-F

Diodes IncorporatedIn Stock: 9400SMCJ43CA-13-F Datasheet

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SMCJ43CA-TP

Micro Commercial CoIn Stock: 9301SMCJ43CA-TP Datasheet

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SMDJ43CA

Alpha & Omega Semiconductor Inc.In Stock: 1618SMDJ43CA Datasheet

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SMDJ43CA-T7

Littelfuse Inc.In Stock: 1964SMDJ43CA-T7 Datasheet

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SMLJ43CA

Bourns Inc.In Stock: 13022SMLJ43CA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution logic for TVS diodes is determined by electrical compatibility within defined parameter tolerances. The critical substitution criteria are:

Primary Electrical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 43V (must match exactly)
• Voltage - Breakdown (Min): 47.8V (must match exactly)
• Package / Case: DO-214AB, SMC (must match for footprint compatibility)
• Mounting Type: Surface Mount (must match)
• Type: Zener (unidirectional or bidirectional)
• Bidirectional Channels: 1 (must match)

Secondary Substitution Parameters (tolerance-dependent):

• Voltage - Clamping (Max) @ Ipp: Range 69.4V to 76.7V acceptable for general-purpose applications
• Current - Peak Pulse (10/1000µs): Range 21.6A to 43.3A acceptable depending on circuit requirements
• Power - Peak Pulse: Range 1500W to 3000W acceptable for applications with varying energy dissipation needs
• Operating Temperature: -55°C ~ 150°C minimum required; extended ranges acceptable

Mandatory Compliance Parameters:

• RoHS3 Compliant (all substitutes)
• Moisture Sensitivity Level 1 (all substitutes)
• Product Status: Active (all substitutes)

All listed substitute parts meet these criteria and are therefore electrically and mechanically compatible with the SMLJ43CE3/TR13 in DO-214AB surface mount applications.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are fully qualified alternatives for the SMLJ43CE3/TR13 based on electrical compatibility, mechanical fit, and regulatory compliance. The following considerations apply to part selection:

Voltage Performance Consideration: The main part (SMLJ43CE3/TR13) exhibits a clamping voltage of 76.7V at peak pulse current. All substitute parts clamp at 69.4V, a 7.3V reduction. This difference is within acceptable tolerance for general-purpose transient protection but may require circuit analysis for applications with tight voltage margin specifications.

Current Handling Capability: Substitute parts divide into two current classes. High-current variants (SMC3K43CA-M3/57, SMDJ43CA, SMDJ43CA-T7, SMLJ43CA) deliver 43.2–43.3A peak pulse capability, matching or exceeding the main part's 39.2A rating. Lower-current variants (SMCJ43CA from Meritek, SMCJ43CA-13-F, SMCJ43CA-TP) deliver 21.6–21.7A. Selection depends on circuit peak transient current requirements.

Power Dissipation Capability: The main part dissipates 300W peak pulse. High-power substitutes (3000W rating: SMC3K43CA-M3/57, SMDJ43CA, SMDJ43CA-T7, SMLJ43CA) provide 10× margin. Mid-power substitutes (1500W rating: all Meritek and Diodes/Micro Commercial variants) provide 5× margin. All are compliant for general-purpose applications.

Temperature Operating Range: The main part operates -55°C to 150°C. SMCJ43CA-TP extends to 175°C; SMDJ43CA-T7 extends to -65°C minimum. Standard range options cover -55°C to 150°C.

REACH Compliance Status: The main part indicates REACH Unaffected. SMDJ43CA-T7 and SMLJ43CA indicate REACH Affected status. All parts maintain ROHS3 compliance and MSL 1 rating.

Availability and Supply: All listed parts maintain Active product status with documented inventory levels, enabling procurement flexibility.

Frequently Asked Questions (FAQ)

Q: Can all listed substitute parts directly replace the SMLJ43CE3/TR13 on existing PCBs? A: Yes. All substitute parts are packaged in DO-214AB/SMC form factor with identical surface mount footprints. Mechanical and electrical pin configurations are identical. No PCB redesign is required.

Q: What does the difference in clamping voltage (76.7V main vs. 69.4V substitutes) mean for circuit performance? A: Clamping voltage determines the maximum voltage impressed across protected circuitry during a transient event. The 7.3V difference means protected components experience lower overvoltage stress with substitute parts, which is beneficial. This difference is negligible for most general-purpose protection applications operating at the specified 43V nominal voltage level.

Q: Which substitute parts have equivalent current ratings to the main part? A: SMDJ43CA, SMDJ43CA-T7, SMLJ43CA, and SMC3K43CA-M3/57 all deliver 43.2–43.3A peak pulse current, matching or exceeding the main part's 39.2A specification. SMCJ43CA variants (Meritek, Diodes, Micro Commercial) deliver lower peak pulse current (21.6–21.7A) and are suitable for lower-transient-energy applications.

Q: Are there differences in operating temperature between the main part and substitutes? A: The main part operates -55°C to 150°C (TJ). SMCJ43CA-TP extends the upper range to 175°C, and SMDJ43CA-T7 extends the lower range to -65°C. Most substitutes match the main part's -55°C to 150°C range. Select extended-temperature variants only if application requirements exceed standard range specifications.

Q: Do all substitute parts comply with the same regulatory standards as the main part? A: All substitute parts are ROHS3 compliant and maintain MSL 1 (Unlimited) moisture sensitivity rating, matching the main part. All parts have Active product status. REACH status varies: the main part is REACH Unaffected, while SMDJ43CA-T7 (Littelfuse) and SMLJ43CA (Bourns) indicate REACH Affected. Verify REACH compliance requirements for your specific application and supply destination.

Q: What is the difference between SMDJ and SMCJ part number series among substitutes? A: SMDJ series indicates Littelfuse/Alpha & Omega design and packaging conventions, while SMCJ series indicates Diodes/Micro Commercial/Meritek/Vishay design conventions. Both are physically identical in DO-214AB/SMC form factor and electrically compatible. The series designation reflects manufacturing source and supply chain origin only.

Q: Can I select a substitute based solely on availability or cost without affecting circuit function? A: Substitutes must be selected based on your application's specific transient current magnitude and power dissipation requirements first. If your circuit requires <21.6A peak pulse and <1500W peak power, any listed substitute is functionally equivalent. If your circuit requires 39–43A peak pulse capability, use high-current variants (SMDJ43CA, SMDJ43CA-T7, SMLJ43CA, or SMC3K43CA-M3/57). Verify clamping voltage and temperature range compliance with your circuit design specifications before final selection.