B540C-13 Schottky Diode Equivalent & Substitute Parts

Part Overview

The B540C-13 is a 40V, 5A Schottky rectifier diode manufactured by Diodes Incorporated in the DO-214AB (SMC) surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The B540C-13 operates across a junction temperature range of -55°C to 125°C and exhibits fast recovery characteristics suitable for high-frequency rectification applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	40	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) Maximum @ If	550 mV @ 5 A	mV @ A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Capacitance @ Vr, F	300	pF @ 4V, 1MHz
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the B540C-13 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) Maximum: 40V (exact match required)
Current - Average Rectified (Io): 5A (exact match required for direct substitution)
Technology: Schottky (fast recovery rectifier)
Mounting Type: Surface Mount
Package / Case: DO-214AB, SMC (mechanical compatibility)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Substitution Categories:

Category 1: Direct Equivalents (40V, 5A) Parts that match all primary electrical specifications and package requirements. These provide pin-for-pin and functional equivalence.

Category 2: Functional Alternatives (40V, 3A) Parts that maintain 40V reverse voltage and fast recovery characteristics but with reduced current rating (3A). These are suitable for applications where the 5A rating is not fully utilized.

Category 3: Higher Current Alternatives (40V, 8A) Parts that exceed the 5A current specification while maintaining 40V reverse voltage. These provide enhanced current handling capability.

Category 4: Lower Current Alternatives (40V, 750mA) Parts with significantly reduced current rating. These are applicable only in low-current applications and represent a downgrade in capability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io A	Vf (Max) mV @ If	Reverse Leakage µA @ 40V	Package	Tj (°C)	Product Status	RoHS Status
B540C-13	Diodes Incorporated	40	5	550 @ 5A	500	DO-214AB, SMC	-55 to 125	Obsolete	Non-compliant
B540C-13-F	Diodes Incorporated	40	5	550 @ 5A	500	DO-214AB, SMC	-55 to 150	Active	ROHS3 Compliant
MBRS540T3G	onsemi	40	5	500 @ 5A	300	DO-214AB, SMC	-65 to 150	Active	ROHS3 Compliant
NRVBS540T3G	onsemi	40	5	500 @ 5A	300	DO-214AB, SMC	-65 to 150	Active	ROHS3 Compliant
CDBC540-G	Comchip Technology	40	5	550 @ 5A	500	DO-214AB, SMC	-40 to 125	Active	ROHS3 Compliant
CDBC540-HF	Comchip Technology	40	5	550 @ 5A	500	DO-214AB, SMC	-50 to 150	Active	ROHS3 Compliant
5822SMJ/TR13	Microchip Technology	40	3	500 @ 3A	1500	DO-214AB, SMC	-55 to 150	Active	Non-compliant
ACDBC340-HF	Comchip Technology	40	3	550 @ 3A	500	DO-214AB, SMC	-55 to 125	Active	ROHS3 Compliant
MBRS340T3G	onsemi	40	3	500 @ 3A	2000	DO-214AB, SMC	-65 to 150	Active	ROHS3 Compliant
HSM840J/TR13	Microchip Technology	40	8	620 @ 8A	250	DO-214AB, SMC	-55 to 175	Active	Non-compliant
BAT165E6327HTSA1	Infineon Technologies	40	0.75	740 @ 0.75A	50	SC-76, SOD-323	-55 to 150	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (40V, 5A Category):

The B540C-13-F from Diodes Incorporated is the primary direct replacement. It maintains identical electrical specifications (40V, 5A, 550mV forward voltage) and package configuration while offering extended junction temperature range (-55°C to 150°C versus -55°C to 125°C) and ROHS3 compliance. This part is recommended for applications requiring minimal design modification.

The MBRS540T3G and NRVBS540T3G from onsemi provide equivalent 40V, 5A performance with improved forward voltage characteristics (500mV @ 5A) and extended temperature range (-65°C to 150°C). NRVBS540T3G includes AEC-Q101 automotive qualification. Both are ROHS3 compliant and suitable for designs where lower forward voltage drop is beneficial.

The CDBC540-G and CDBC540-HF from Comchip Technology maintain the 40V, 5A specification with 550mV forward voltage matching the original part. CDBC540-HF offers extended temperature range (-50°C to 150°C) and is ROHS3 compliant. CDBC540-G operates to -40°C minimum.

Reduced Current Alternatives (40V, 3A Category):

The 5822SMJ/TR13 (Microchip), ACDBC340-HF (Comchip), and MBRS340T3G (onsemi) are suitable only for applications where the 5A current requirement can be reduced to 3A. These parts maintain 40V reverse voltage and fast recovery characteristics. ACDBC340-HF includes AEC-Q101 automotive qualification. Current-limited applications may use these parts with appropriate circuit design verification.

Higher Current Alternative (40V, 8A Category):

The HSM840J/TR13 from Microchip Technology provides 8A current capability at 40V reverse voltage, exceeding the original 5A specification. This part is applicable where increased current handling is required. Forward voltage is 620mV @ 8A. RoHS compliance status is non-compliant.

Lower Current Alternative (40V, 750mA Category):

The BAT165E6327HTSA1 from Infineon Technologies operates at 40V with 750mA current rating in a smaller SC-76 SOD-323 package. This part is applicable only for low-current applications and represents a significant downgrade in current capability. Package change requires PCB layout modification.

Compliance Considerations:

For new designs requiring RoHS3 compliance, B540C-13-F, MBRS540T3G, NRVBS540T3G, CDBC540-G, CDBC540-HF, ACDBC340-HF, and BAT165E6327HTSA1 are compliant options. The original B540C-13 is RoHS non-compliant and obsolete.

For automotive applications requiring AEC-Q101 qualification, NRVBS540T3G and ACDBC340-HF are qualified options.

Frequently Asked Questions (FAQ)

Q: Can the B540C-13 be directly replaced with B540C-13-F?

A: Yes. The B540C-13-F is a direct equivalent with identical electrical specifications (40V, 5A, 550mV forward voltage) and package configuration. The primary differences are extended junction temperature range (-55°C to 150°C) and ROHS3 compliance. No circuit modification is required.

Q: What is the difference between MBRS540T3G and CDBC540-HF?

A: Both are 40V, 5A Schottky diodes in DO-214AB SMC packages. MBRS540T3G has lower forward voltage (500mV @ 5A) and wider temperature range (-65°C to 150°C). CDBC540-HF has forward voltage of 550mV @ 5A and temperature range of -50°C to 150°C. Selection depends on forward voltage drop requirements and minimum operating temperature specification.

Q: Can I use a 3A part (MBRS340T3G or ACDBC340-HF) instead of the 5A B540C-13?

A: Only if the application circuit operates at or below 3A average rectified current. The 3A parts maintain 40V reverse voltage and fast recovery characteristics but cannot safely handle 5A continuous current. Circuit analysis must confirm current requirements before substitution.

Q: Why is the BAT165E6327HTSA1 listed as a substitute if it has only 750mA rating?

A: The BAT165E6327HTSA1 is included for applications where current requirements are significantly lower than 5A. It maintains 40V reverse voltage and fast recovery characteristics. However, the package change from DO-214AB SMC to SC-76 SOD-323 requires PCB layout modification. This part is suitable only for low-current applications.

Q: What does RoHS3 compliance mean for this application?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. For new designs and production, RoHS3 compliant parts (B540C-13-F, MBRS540T3G, NRVBS540T3G, CDBC540-G, CDBC540-HF, ACDBC340-HF, BAT165E6327HTSA1) are required in many jurisdictions.

Q: Is NRVBS540T3G suitable for automotive applications?

A: Yes. NRVBS540T3G carries AEC-Q101 automotive qualification and is rated for -65°C to 150°C junction temperature. It is suitable for automotive rectification circuits requiring 40V, 5A performance.

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

A: Forward voltage (Vf) affects power dissipation and circuit efficiency. Lower Vf (500mV in MBRS540T3G and NRVBS540T3G) results in less heat generation compared to higher Vf (550mV in B540C-13-F and CDBC540 series). Selection depends on thermal management requirements and efficiency specifications.

Q: Can HSM840J/TR13 be used as a direct replacement?

A: HSM840J/TR13 is not a direct replacement due to higher current rating (8A versus 5A) and higher forward voltage (620mV @ 8A versus 550mV @ 5A). It is suitable only for applications requiring higher current capability. RoHS compliance status is non-compliant.

Q: What packaging options are available for 40V, 5A substitutes?

A: All 40V, 5A direct substitutes (B540C-13-F, MBRS540T3G, NRVBS540T3G, CDBC540-G, CDBC540-HF) use DO-214AB SMC package, providing mechanical compatibility with the original B540C-13. The BAT165E6327HTSA1 uses SC-76 SOD-323 package and requires PCB layout modification.

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