LSM540J/TR13 Equivalent & Substitute Parts

Part Overview

The LSM540J/TR13 is a Schottky rectifier diode manufactured by Microchip Technology, rated for 40 V DC reverse voltage and 5 A average rectified current in a surface mount DO-214AB (SMC) package. This component is classified as Active product status and is supplied in Tape & Reel packaging. Schottky diodes in this rating class are used in power conversion circuits, reverse polarity protection, and high-frequency rectification applications where fast recovery characteristics are required. Alternative equivalent parts may be necessary due to supply chain considerations, packaging format preferences, or specific compliance requirements for target applications.

Key Parameters

Parameter	LSM540J/TR13 Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) (Max) @ If	520 mV @ 5 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	2 mA @ 40 V	mA
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
Technology	Schottky	—
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LSM540J/TR13 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal 40 V
Current - Average Rectified (Io): Must equal or exceed 5 A
Technology: Must be Schottky
Package / Case: Must be DO-214AB or SMC equivalent
Mounting Type: Must be Surface Mount
Speed: Must support Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Operating Temperature - Junction: Acceptable range -55°C to 150°C or wider
Voltage - Forward (Vf) (Max) @ If: Acceptable within typical Schottky diode range (490 mV to 650 mV @ rated current)
Current - Reverse Leakage @ Vr: Acceptable within typical range (1 µA to 500 µA @ 40 V)

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (5 A Rating): Parts meeting all primary criteria with 5 A current rating, including NRVBS540T3G, CDBC540-HF, SK54L-TP, SSC54HE3_A/I, and B540C-13-F.

Category B - Reduced Current Rating (3 A Rating): Parts meeting voltage, package, and technology criteria but with 3 A current rating, including B340-13-F, STPS340S, STPS340SY, and STPS3L40S. These are suitable only for applications where the 5 A rating is not required.

Category C - Elevated Current Rating (6 A Rating): Parts exceeding the 5 A requirement, including SK64L-TP. This part is marked as Not For New Designs.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA/mA]	Package	Tj (°C)	RoHS Status	Product Status
LSM540J/TR13	Microchip Technology	40	5	520 @ 5A	2 mA @ 40V	DO-214AB, SMC	-55 ~ 150	Non-compliant	Active
B340-13-F	Diodes Incorporated	40	3	500 @ 3A	500 µA @ 40V	DO-214AB, SMC	-55 ~ 125	ROHS3 Compliant	Active
B540C-13-F	Diodes Incorporated	40	5	550 @ 5A	500 µA @ 40V	DO-214AB, SMC	-55 ~ 150	ROHS3 Compliant	Active
CDBC540-HF	Comchip Technology	40	5	550 @ 5A	500 µA @ 40V	DO-214AB, SMC	-50 ~ 150	ROHS3 Compliant	Active
NRVBS540T3G	onsemi	40	5	500 @ 5A	300 µA @ 40V	DO-214AB, SMC	-65 ~ 150	ROHS3 Compliant	Active
SK54L-TP	Micro Commercial Co	40	5	550 @ 5A	1 mA @ 40V	DO-214AB, SMC	-55 ~ 150	ROHS3 Compliant	Active
SK64L-TP	Micro Commercial Co	40	6	650 @ 6A	1 mA @ 40V	DO-214AB, SMC	-55 ~ 150	ROHS3 Compliant	Not For New Designs
SSC54HE3_A/I	Vishay General Semiconductor - Diodes Division	40	5	490 @ 5A	500 µA @ 40V	DO-214AB, SMC	-65 ~ 150	ROHS3 Compliant	Active
STPS340S	STMicroelectronics	40	3	630 @ 3A	20 µA @ 40V	DO-214AB, SMC	-55 ~ 150	ROHS3 Compliant	Active
STPS340SY	STMicroelectronics	40	3	630 @ 3A	20 µA @ 40V	DO-214AB, SMC	-40 ~ 150	ROHS3 Compliant	Active
STPS3L40S	STMicroelectronics	40	3	500 @ 3A	100 µA @ 40V	DO-214AB, SMC	-55 ~ 150	ROHS3 Compliant	Active

Engineering Selection Recommendations

For Direct Replacement (5 A Current Rating):

The following parts provide electrical and mechanical equivalence to the LSM540J/TR13 with 5 A current rating:

B540C-13-F (Diodes Incorporated): Matches 40 V, 5 A specifications with ROHS3 compliance and -55°C to 150°C operating range. Forward voltage of 550 mV @ 5 A is within acceptable Schottky range.
NRVBS540T3G (onsemi): Meets all electrical specifications with extended temperature range (-65°C to 150°C) and AEC-Q101 automotive qualification. Forward voltage of 500 mV @ 5 A is optimal. ROHS3 compliant.
SK54L-TP (Micro Commercial Co): Provides 40 V, 5 A operation with ROHS3 compliance and -55°C to 150°C range. Reverse leakage of 1 mA @ 40 V is comparable to the main part.
SSC54HE3_A/I (Vishay General Semiconductor - Diodes Division): Delivers 40 V, 5 A with lowest forward voltage (490 mV @ 5 A), extended temperature range (-65°C to 150°C), and AEC-Q101 automotive qualification. ROHS3 compliant.
CDBC540-HF (Comchip Technology): Supports 40 V, 5 A with ROHS3 compliance and -50°C to 150°C operating range. Supplied in Tape & Reel packaging matching the main part format.

For Reduced Current Applications (3 A Current Rating):

The following parts are suitable only for applications where 5 A current is not required:

B340-13-F (Diodes Incorporated): 40 V, 3 A with ROHS3 compliance and -55°C to 125°C range.
STPS340S (STMicroelectronics): 40 V, 3 A with ROHS3 compliance and -55°C to 150°C range. Lowest reverse leakage at 20 µA @ 40 V.
STPS340SY (STMicroelectronics): 40 V, 3 A with AEC-Q101 automotive qualification, ROHS3 compliance, and -40°C to 150°C range.
STPS3L40S (STMicroelectronics): 40 V, 3 A with ROHS3 compliance and -55°C to 150°C range. Forward voltage of 500 mV @ 3 A is favorable.

For Elevated Current Applications (6 A Current Rating):

SK64L-TP (Micro Commercial Co): Provides 40 V, 6 A operation with ROHS3 compliance. However, this part is marked as Not For New Designs and should be used only when existing inventory is available and no alternative meets application requirements.

Compliance Considerations:

The main part LSM540J/TR13 is RoHS non-compliant. All listed substitute parts except the main part are ROHS3 compliant, making them suitable for applications requiring RoHS compliance. All parts maintain REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can I use a 3 A rated diode (B340-13-F, STPS340S, STPS340SY, STPS3L40S) as a direct replacement for the LSM540J/TR13?

A: No. The LSM540J/TR13 is rated for 5 A average rectified current. Using a 3 A rated diode in an application requiring 5 A operation will result in component failure or reduced circuit reliability. The 3 A parts are suitable only for applications where the circuit current requirement does not exceed 3 A.

Q: What is the difference between the LSM540J/TR13 and B540C-13-F?

A: Both parts are rated for 40 V, 5 A operation in DO-214AB (SMC) packages. The primary differences are: (1) B540C-13-F is ROHS3 compliant while LSM540J/TR13 is not; (2) B540C-13-F has forward voltage of 550 mV @ 5 A versus 520 mV for the main part; (3) B540C-13-F has reverse leakage of 500 µA @ 40 V versus 2 mA for the main part; (4) B540C-13-F is supplied in Cut Tape & Digi-Reel format while LSM540J/TR13 is in Tape & Reel.

Q: Which substitute part has the lowest forward voltage drop?

A: SSC54HE3_A/I has the lowest forward voltage at 490 mV @ 5 A, compared to 520 mV for the main part. This lower forward voltage reduces power dissipation in applications with continuous 5 A current flow.

Q: Are automotive-qualified alternatives available?

A: Yes. Both NRVBS540T3G (onsemi) and SSC54HE3_A/I (Vishay) carry AEC-Q101 automotive qualification and are rated for 40 V, 5 A operation. Both are ROHS3 compliant and suitable for automotive applications.

Q: What is the difference between SK54L-TP and SK64L-TP?

A: SK54L-TP is rated for 40 V, 5 A operation and is Active product status. SK64L-TP is rated for 40 V, 6 A operation but is marked as Not For New Designs. Both use DO-214AB (SMC) packages. The SK64L-TP should not be selected for new designs unless existing inventory constraints require its use.

Q: Can I use CDBC540-HF as a replacement if my circuit operates at -50°C minimum temperature?

A: CDBC540-HF has an operating temperature range of -50°C to 150°C, which is narrower than the LSM540J/TR13 range of -55°C to 150°C. If your application requires operation below -50°C, CDBC540-HF is not suitable. Alternative parts with -55°C minimum rating include B540C-13-F, SK54L-TP, STPS340S, and STPS3L40S.

Q: What packaging formats are available for 40 V, 5 A Schottky diodes?

A: The substitute parts are supplied in two packaging formats: (1) Tape & Reel (TR): CDBC540-HF, NRVBS540T3G, SK64L-TP; (2) Cut Tape (CT) & Digi-Reel: B540C-13-F, SK54L-TP, SSC54HE3_A/I. The main part LSM540J/TR13 is supplied in Tape & Reel format. Packaging format selection depends on assembly equipment and production volume requirements.

Q: Is the LSM540J/TR13 still in production?

A: Yes, the LSM540J/TR13 is classified as Active product status. However, all substitute parts listed are also Active, providing multiple sourcing options for supply chain resilience.

Q: What is the significance of reverse leakage current differences between parts?

A: Reverse leakage current affects power dissipation and circuit performance at high temperatures. The LSM540J/TR13 has 2 mA @ 40 V reverse leakage. Substitute parts range from 1 mA (SK54L-TP, SK64L-TP) to 500 µA (B540C-13-F, CDBC540-HF, SSC54HE3_A/I) to 20 µA (STPS340S, STPS340SY). Lower reverse leakage reduces standby power consumption and heat generation in reverse-biased conditions.

Q: Can I substitute the LSM540J/TR13 with a part rated for higher voltage (e.g., 60 V)?

A: No. Substitution must maintain the 40 V DC reverse voltage rating. Using a higher voltage rated part introduces unnecessary cost and may alter circuit performance characteristics. All listed substitute parts maintain the 40 V specification.

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