LSM345JE3/TR13 Equivalent & Substitute Parts

Part Overview

The LSM345JE3/TR13 is a Schottky rectifier diode manufactured by Microchip Technology, rated for 45 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AB (SMC) package. This component is actively produced and RoHS3 compliant. Equivalent and substitute parts are identified based on matching or exceeding the electrical performance parameters while maintaining compatible mechanical packaging and thermal characteristics. Alternative sources and packaging formats are available to support procurement flexibility, design redundancy, and supply chain continuity.

Substiute Parts

LSM345JE3/TR13

Microchip TechnologyIn Stock: 1081LSM345JE3/TR13 Datasheet

Current PartRFQ

LSM345J/TR13

Microchip TechnologyIn Stock: 4052LSM345J/TR13 Datasheet

Parametric EquivalentRFQ

B340-13-F

Diodes IncorporatedIn Stock: 51481B340-13-F Datasheet

SimilarRFQ

B340Q-13-F

Diodes IncorporatedIn Stock: 18100B340Q-13-F Datasheet

SimilarRFQ

B350-13-F

Diodes IncorporatedIn Stock: 16404B350-13-F Datasheet

SimilarRFQ

SS34-M3/57T

Vishay General Semiconductor - Diodes DivisionIn Stock: 4227SS34-M3/57T Datasheet

SimilarRFQ

STPS340S

STMicroelectronicsIn Stock: 50815STPS340S Datasheet

SimilarRFQ

STPS340SY

STMicroelectronicsIn Stock: 12677STPS340SY Datasheet

SimilarRFQ

STPS3L40S

STMicroelectronicsIn Stock: 2738STPS3L40S Datasheet

SimilarRFQ

STPS3L40SY

STMicroelectronicsIn Stock: 2861STPS3L40SY Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LSM345JE3/TR13 is determined by the following critical parameters:

Voltage Rating: The reverse voltage (Vr) must equal or exceed 45 V. Parts rated at 40 V operate below the specified maximum and are classified as similar but not direct equivalents. Parts rated at 50 V or higher provide margin and are acceptable substitutes.

Current Rating: The average rectified current (Io) must equal or exceed 3 A. All identified substitutes maintain the 3 A rating.

Package Compatibility: All substitutes use the DO-214AB (SMC) surface mount package, ensuring mechanical and thermal compatibility with the original design.

Technology: All substitutes employ Schottky diode technology, maintaining identical switching characteristics and forward voltage behavior.

Thermal Range: The operating junction temperature range must support the application requirements. The main part operates from -55°C to 150°C. Substitutes with reduced upper limits (-55°C to 125°C) are acceptable for applications not requiring the full 150°C capability.

Packaging Format: The main part is supplied in Tape & Reel (TR) format. Equivalent parts in Cut Tape (CT) or alternative reel formats are functionally identical but differ in supply configuration.

Compliance: RoHS3 compliance is preferred for regulatory alignment. The parametric equivalent LSM345J/TR13 is RoHS non-compliant and is listed for reference only.

Parameter Comparison

Engineering Selection Recommendations

Direct Parametric Equivalent: LSM345J/TR13 (Microchip Technology) matches all electrical specifications and thermal range of the LSM345JE3/TR13. The primary distinction is packaging format (Cut Tape vs. Tape & Reel) and RoHS compliance status. This part is suitable for applications where RoHS non-compliance is acceptable and procurement volume supports alternative packaging.

Voltage-Rated Substitutes (40 V Rating): Parts rated at 40 V maximum reverse voltage (B340-13-F, B340Q-13-F, SS34-M3/57T, STPS340S, STPS340SY, STPS3L40S, STPS3L40SY) operate below the 45 V specification of the main part. These are classified as similar substitutes and are suitable only for applications where the actual reverse voltage stress does not exceed 40 V. Circuit design review is required to confirm voltage margin.

Voltage-Rated Substitute (50 V Rating): B350-13-F (Diodes Incorporated) is rated at 50 V maximum reverse voltage, exceeding the 45 V specification and providing additional voltage margin. This part is a direct substitute from a voltage perspective. Forward voltage is elevated at 700 mV versus 520 mV, which may affect power dissipation in high-current applications.

Automotive-Qualified Substitutes: B340Q-13-F, STPS340SY, and STPS3L40SY carry AEC-Q101 automotive qualification. These parts are suitable for automotive and high-reliability applications requiring formal qualification documentation.

Thermal Capability: All identified substitutes support the -55°C to 150°C junction temperature range of the main part, with the exception of B340-13-F, B350-13-F, and SS34-M3/57T, which are limited to 125°C maximum. Applications requiring full 150°C operation must use parts with confirmed 150°C ratings.

RoHS Compliance: All substitutes except LSM345J/TR13 are RoHS3 compliant, aligning with current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 40 V rated diode for the 45 V LSM345JE3/TR13?

A: Substitution is possible only if circuit analysis confirms that the actual reverse voltage stress does not exceed 40 V. The 45 V rating of the main part provides a 5 V margin above typical 40 V substitutes. Use of 40 V parts in applications designed for 45 V operation reduces safety margin and is not recommended without explicit voltage stress verification.

Q: What is the difference between LSM345JE3/TR13 and LSM345J/TR13?

A: Both parts are electrically identical Schottky diodes with 45 V, 3 A ratings from Microchip Technology. The primary differences are packaging format (Tape & Reel vs. Cut Tape) and RoHS compliance status. LSM345J/TR13 is RoHS non-compliant. Selection depends on procurement requirements and regulatory compliance mandates.

Q: Are all substitute parts available in the same DO-214AB package?

A: Yes. All identified substitute parts use the DO-214AB (SMC) surface mount package, ensuring mechanical and thermal compatibility with the original design. Printed circuit board layouts and thermal management designs require no modification.

Q: Which substitute offers the best forward voltage performance?

A: B340-13-F, SS34-M3/57T, and STPS3L40S offer forward voltage of 500 mV at 3 A, matching the main part specification. STPS340S and STPS340SY exhibit higher forward voltage at 630 mV, resulting in increased power dissipation. Selection should account for thermal budget and efficiency requirements.

Q: Can I use B350-13-F as a direct replacement?

A: B350-13-F is mechanically and thermally compatible and provides superior voltage rating at 50 V. However, forward voltage is elevated at 700 mV versus 520 mV, increasing power dissipation by approximately 35% at 3 A. Thermal analysis is required to confirm that increased dissipation does not exceed board-level thermal limits.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 is an automotive industry qualification standard. Parts carrying this designation (B340Q-13-F, STPS340SY, STPS3L40SY) have undergone formal reliability testing and are suitable for automotive and high-reliability applications. Non-qualified parts are suitable for general industrial and consumer applications.

Q: Does reverse leakage current affect substitution decisions?

A: Reverse leakage varies among substitutes. The main part specifies 1.5 mA at 45 V. Most 40 V substitutes exhibit 500 µA at 40 V, which is lower in absolute terms but measured at lower voltage. STPS340S and STPS340SY show 20 µA leakage, significantly lower than the main part. Applications sensitive to leakage current should account for these differences in circuit design.

Q: Is thermal range a critical factor in selecting a substitute?

A: Thermal range is critical only if the application requires operation at the full -55°C to 150°C junction temperature range. Parts limited to 125°C maximum (B340-13-F, B350-13-F, SS34-M3/57T) are unsuitable for applications requiring 150°C operation. Verify application thermal requirements before selection.