LSM840J/TR13 Equivalent & Substitute Parts

Part Overview

The LSM840J/TR13 is a Schottky rectifier diode manufactured by Microchip Technology, rated for 40 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. The LSM840J/TR13 is supplied in Tape & Reel packaging with 1,039 pieces currently in stock.

Equivalent and substitute parts are identified based on matching or compatible electrical ratings (reverse voltage, forward current capacity, forward voltage drop) and mechanical compatibility (DO-214AB/SMC package format). Substitutes are selected where core parameters align within acceptable engineering tolerances for the application.

Key Parameters

Parameter	LSM840J/TR13 Value
Voltage - DC Reverse (Vr) (Max)	40 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 @ 40 V
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky

Substitute Part Grouping Explanation

Substitute parts for the LSM840J/TR13 are grouped based on the following substitution criteria:

Primary Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 40 V (exact match required)
Package / Case: DO-214AB, SMC (mechanical compatibility required)
Technology: Schottky (functional equivalence)
Mounting Type: Surface Mount (assembly compatibility)

Secondary Compatibility Parameters:

Current - Average Rectified (Io): Substitutes rated at 3 A, 4 A, 6 A, or 8 A are acceptable where application current requirements do not exceed the substitute rating
Voltage - Forward (Vf) (Max) @ If: Variations acceptable within typical Schottky diode performance ranges
Current - Reverse Leakage @ Vr: Lower leakage values indicate improved performance characteristics
Operating Temperature - Junction: Substitutes with -55°C ~ 150°C or -40°C ~ 150°C ranges are compatible

Substitutes are organized by current rating to facilitate selection based on specific application requirements.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Temp Range (Junction)	Product Status	RoHS Status
LSM840J/TR13	Microchip Technology	40 V	8 A	520 mV @ 8 A	2 mA @ 40 V	DO-214AB, SMC	-55°C ~ 150°C	Active	RoHS non-compliant
B340-13-F	Diodes Incorporated	40 V	3 A	500 mV @ 3 A	500 µA @ 40 V	DO-214AB, SMC	-55°C ~ 125°C	Active	ROHS3 Compliant
SK44L-TP	Micro Commercial Co	40 V	4 A	450 mV @ 4 A	500 µA @ 40 V	DO-214AB, SMC	-55°C ~ 125°C	Active	ROHS3 Compliant
SK64L-TP	Micro Commercial Co	40 V	6 A	650 mV @ 6 A	1 mA @ 40 V	DO-214AB, SMC	-55°C ~ 150°C	Not For New Designs	ROHS3 Compliant
SK84L-TP	Micro Commercial Co	40 V	8 A	650 mV @ 8 A	1 mA @ 40 V	DO-214AB, SMC	-55°C ~ 150°C	Not For New Designs	ROHS3 Compliant
STPS340S	STMicroelectronics	40 V	3 A	630 mV @ 3 A	20 µA @ 40 V	DO-214AB, SMC	-55°C ~ 150°C	Active	ROHS3 Compliant
STPS340SY	STMicroelectronics	40 V	3 A	630 mV @ 3 A	20 µA @ 40 V	DO-214AB, SMC	-40°C ~ 150°C	Active	ROHS3 Compliant
STPS3L40S	STMicroelectronics	40 V	3 A	500 mV @ 3 A	100 µA @ 40 V	DO-214AB, SMC	-55°C ~ 150°C	Active	ROHS3 Compliant
STPS3L40SY	STMicroelectronics	40 V	3 A	500 mV @ 3 A	100 µA @ 40 V	DO-214AB, SMC	-40°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Current Rating Match (8 A):

SK84L-TP (Micro Commercial Co) provides an 8 A current rating matching the LSM840J/TR13. However, SK84L-TP carries a "Not For New Designs" product status, indicating it is in end-of-life phase. The forward voltage drop is higher at 650 mV @ 8 A compared to 520 mV @ 8 A for the LSM840J/TR13. SK84L-TP is ROHS3 compliant and operates across the full -55°C ~ 150°C temperature range.

For RoHS Compliance with Lower Current Ratings:

All substitute parts listed (B340-13-F, SK44L-TP, SK64L-TP, SK84L-TP, STPS340S, STPS340SY, STPS3L40S, STPS3L40SY) are ROHS3 compliant, whereas the LSM840J/TR13 is RoHS non-compliant. Selection among these substitutes depends on application current requirements:

3 A applications: B340-13-F, STPS340S, STPS340SY, STPS3L40S, STPS3L40SY
4 A applications: SK44L-TP
6 A applications: SK64L-TP
8 A applications: SK84L-TP

For Active Product Status:

B340-13-F, SK44L-TP, STPS340S, STPS340SY, STPS3L40S, and STPS3L40SY all carry Active product status, indicating ongoing availability and support. SK64L-TP and SK84L-TP are marked "Not For New Designs" and should be avoided in new circuit designs.

For Automotive Applications:

STPS340SY and STPS3L40SY are automotive-grade components with AEC-Q101 qualification, suitable for automotive and high-reliability applications requiring extended temperature ranges (-40°C ~ 150°C).

For Temperature Range Compatibility:

The LSM840J/TR13 operates from -55°C ~ 150°C. Substitutes maintaining this full range include SK64L-TP, SK84L-TP, STPS340S, STPS3L40S, and STPS3L40SY. B340-13-F and SK44L-TP are limited to -55°C ~ 125°C.

Frequently Asked Questions (FAQ)

Q: Can I use a 3 A rated diode as a substitute for the 8 A LSM840J/TR13?

A: No. The LSM840J/TR13 is rated for 8 A average rectified current. Substitutes must be rated for the application's actual current requirement. Using an undersized diode (3 A) in an 8 A application will result in component failure due to thermal stress and exceeding maximum current ratings.

Q: What is the difference between SK84L-TP and LSM840J/TR13?

A: Both are 40 V, 8 A Schottky diodes in DO-214AB packages. Key differences: SK84L-TP has higher forward voltage (650 mV vs. 520 mV @ 8 A), lower reverse leakage (1 mA vs. 2 mA @ 40 V), is ROHS3 compliant (vs. RoHS non-compliant), but carries "Not For New Designs" status. SK84L-TP is suitable for replacement in existing designs but should not be selected for new circuit development.

Q: Are all substitute parts compatible with the DO-214AB package footprint?

A: Yes. All listed substitute parts use the DO-214AB (SMC) package format, ensuring mechanical and footprint compatibility with the LSM840J/TR13. No PCB layout modifications are required for package substitution.

Q: What does "Not For New Designs" product status mean?

A: "Not For New Designs" indicates the component is in end-of-life phase. Manufacturers continue to supply existing inventory but do not recommend these parts for new circuit designs. SK64L-TP and SK84L-TP carry this status. For new designs, select from parts with Active status: B340-13-F, SK44L-TP, STPS340S, STPS340SY, STPS3L40S, or STPS3L40SY.

Q: Which substitute offers the best RoHS compliance and active product status?

A: STPS3L40S and STPS3L40SY (STMicroelectronics) are ROHS3 compliant with Active product status. STPS3L40SY additionally provides automotive-grade qualification (AEC-Q101) and extended temperature range (-40°C ~ 150°C). For non-automotive applications, STPS3L40S is suitable. For automotive applications, STPS3L40SY is recommended.

Q: Can I substitute a higher-rated diode (e.g., 8 A) with a lower-rated one (e.g., 4 A)?

A: No. Current ratings must meet or exceed application requirements. Undersized diodes cannot safely handle the intended current load and will fail prematurely. However, oversizing is acceptable if thermal management and circuit design accommodate the higher-rated component.

Q: What is the significance of forward voltage (Vf) differences between substitutes?

A: Forward voltage drop affects power dissipation and circuit efficiency. The LSM840J/TR13 has 520 mV @ 8 A, while SK84L-TP has 650 mV @ 8 A. Higher Vf increases heat generation. In power-sensitive applications, lower Vf substitutes (e.g., STPS3L40S at 500 mV @ 3 A) reduce power loss but are limited to lower current ratings.

Q: Are automotive-grade substitutes (STPS340SY, STPS3L40SY) suitable for non-automotive applications?

A: Yes. Automotive-grade components meet or exceed standard industrial specifications. STPS340SY and STPS3L40SY can be used in non-automotive applications without restriction. Their AEC-Q101 qualification ensures higher reliability and extended temperature performance, making them suitable for demanding industrial and consumer applications.

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