LSM845J/TR13 Equivalent & Substitute Parts

Part Overview

The LSM845J/TR13 is a Schottky rectifier diode manufactured by Microchip Technology, rated for 45 V DC reverse voltage and 8 A average rectified current in a DO-214AB surface mount package. This component is classified as Active product status and is RoHS non-compliant. Schottky diodes in this voltage and current class are used in power supply circuits, voltage regulation, and reverse polarity protection applications where fast recovery and low forward voltage drop are required. Substitute parts may be necessary due to component availability, supply chain constraints, or design requirement changes that permit operation within alternative electrical specifications.

Key Parameters

Parameter	LSM845J/TR13 Specification
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io)	8 A
Voltage - Forward (Vf) (Max) @ If	520 mV @ 8 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	2 mA @ 45 V
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky

Substitute Part Grouping Explanation

Substitution of the LSM845J/TR13 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Package / Case: DO-214AB, SMC (surface mount)
Technology: Schottky rectifier diode
Voltage - DC Reverse (Vr) (Max): Must equal or exceed 45 V
Current - Average Rectified (Io): Must equal or exceed 8 A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Surface Mount

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Lower values are acceptable
Current - Reverse Leakage @ Vr: Lower values are acceptable
Operating Temperature - Junction: Extended ranges are acceptable

The substitute parts listed below meet the mandatory compatibility criteria. Parts with lower current ratings (below 8 A) or lower voltage ratings (below 45 V) do not qualify as direct substitutes for the LSM845J/TR13 and are included for reference only to show the available product family.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Product Status	RoHS Status
LSM845J/TR13	Microchip Technology	45 V	8 A	520 mV @ 8 A	2 mA @ 45 V	DO-214AB, SMC	Active	RoHS non-compliant
VSSC8L45-M3/9AT	Vishay General Semiconductor	45 V	4.9 A	420 mV @ 4 A	1.85 mA @ 45 V	DO-214AB, SMC	Active	ROHS3 Compliant
SK64L-TP	Micro Commercial Co	40 V	6 A	650 mV @ 6 A	1 mA @ 40 V	DO-214AB, SMC	Not For New Designs	ROHS3 Compliant
SK44L-TP	Micro Commercial Co	40 V	4 A	450 mV @ 4 A	500 µA @ 40 V	DO-214AB, SMC	Active	ROHS3 Compliant
STPS340SY	STMicroelectronics	40 V	3 A	630 mV @ 3 A	20 µA @ 40 V	DO-214AB, SMC	Active	ROHS3 Compliant
STPS340S	STMicroelectronics	40 V	3 A	630 mV @ 3 A	20 µA @ 40 V	DO-214AB, SMC	Active	ROHS3 Compliant
STPS3L40S	STMicroelectronics	40 V	3 A	500 mV @ 3 A	100 µA @ 40 V	DO-214AB, SMC	Active	ROHS3 Compliant
STPS3L40SY	STMicroelectronics	40 V	3 A	500 mV @ 3 A	100 µA @ 40 V	DO-214AB, SMC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Equivalent Voltage and Current Ratings):

The VSSC8L45-M3/9AT from Vishay General Semiconductor is the only substitute part that maintains the 45 V voltage rating of the LSM845J/TR13. However, the VSSC8L45-M3/9AT is rated for 4.9 A average rectified current, which is below the 8 A specification of the main part. This part is suitable only for applications where the actual circuit current demand does not exceed 4.9 A. The VSSC8L45-M3/9AT is Active product status and ROHS3 compliant, offering improved environmental compliance compared to the LSM845J/TR13.

Reduced-Rating Substitutes (Lower Voltage or Current):

The remaining substitute parts (SK64L-TP, SK44L-TP, STPS340SY, STPS340S, STPS3L40S, STPS3L40SY) are rated for 40 V maximum reverse voltage, which is 5 V below the LSM845J/TR13 specification. These parts are suitable only for applications where the actual reverse voltage stress does not exceed 40 V. Current ratings for these parts range from 3 A to 6 A, all below the 8 A specification of the main part.

Product Status Considerations:

The SK64L-TP carries a "Not For New Designs" status and should not be selected for new circuit development. All other substitute parts listed carry Active product status, indicating ongoing manufacturer support and availability.

Compliance Status:

The LSM845J/TR13 is RoHS non-compliant. All substitute parts listed are ROHS3 compliant, providing improved environmental compliance for applications subject to RoHS regulations.

Frequently Asked Questions (FAQ)

Q: Can the VSSC8L45-M3/9AT replace the LSM845J/TR13 in all applications?

A: The VSSC8L45-M3/9AT maintains the 45 V voltage rating but is rated for 4.9 A average rectified current versus the 8 A rating of the LSM845J/TR13. Substitution is valid only if the actual circuit current does not exceed 4.9 A. Circuit analysis must confirm that peak and average current demands remain within the lower rating.

Q: Why are the STMicroelectronics STPS parts listed as substitutes if they have lower voltage and current ratings?

A: These parts are listed to show the available product family within the DO-214AB package category. They are suitable substitutes only for applications where both the reverse voltage stress remains below 40 V and the current demand remains below 3 A. Direct substitution for the LSM845J/TR13 in its full 45 V, 8 A operating envelope is not possible with these parts.

Q: What is the difference between STPS340S and STPS340SY?

A: Both parts have identical electrical specifications (40 V, 3 A). The STPS340SY includes automotive-grade qualification (AEC-Q101) and an extended operating temperature range of -40°C to 150°C, compared to the STPS340S maximum junction temperature of 150°C. The STPS340SY is suitable for automotive applications requiring AEC-Q101 compliance.

Q: Is the SK64L-TP a viable substitute?

A: The SK64L-TP carries a "Not For New Designs" product status, indicating that the manufacturer does not recommend this part for new circuit development. While it may be available in existing inventory, it should not be selected for new designs. Active alternatives should be prioritized.

Q: What is the significance of the DO-214AB package designation?

A: The DO-214AB package, also designated as SMC (Surface Mount Case), is a standardized surface mount package for rectifier diodes. All substitute parts listed use this same package, ensuring mechanical and electrical compatibility with PCB layouts designed for the LSM845J/TR13.

Q: How does forward voltage drop affect substitution?

A: Forward voltage drop (Vf) affects power dissipation and thermal performance. The LSM845J/TR13 specifies 520 mV @ 8 A. Substitute parts with lower Vf values (such as VSSC8L45-M3/9AT at 420 mV @ 4 A) result in lower power dissipation. However, Vf comparison is valid only when comparing at equivalent current levels. Lower current-rated parts cannot be directly compared on Vf alone.

Q: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" mean?

A: This specification indicates that the diode exhibits fast recovery characteristics with a recovery time of 500 nanoseconds or less when switching from forward to reverse bias at currents exceeding 200 mA. All substitute parts listed meet this fast recovery specification, ensuring compatibility in high-frequency switching applications.

Q: Are there any temperature range differences between the main part and substitutes?

A: The LSM845J/TR13 operates from -55°C to 150°C junction temperature. The VSSC8L45-M3/9AT operates from -40°C to 150°C, providing a narrower low-temperature range. Most other substitutes specify 150°C maximum junction temperature without a minimum specification. Applications requiring operation below -40°C require the LSM845J/TR13 or verification of substitute part low-temperature performance.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message