MBRX0540-TP Equivalent & Substitute Parts

Part Overview

The MBRX0540-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 40 V DC reverse voltage and 500 mA average rectified current in a surface mount SOD-323 package. This component is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements where the original part is no longer readily procurable.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	500 mA
Voltage - Forward (Vf) (Max) @ If	550 mV @ 500 mA
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	300 µA @ 40 V
Package / Case	SC-76, SOD-323
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 125°C
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the MBRX0540-TP is determined by the following critical parameters: voltage rating (40 V DC reverse), current rating (500 mA average rectified), package type (SOD-323), and technology (Schottky). Parts are classified into two substitution categories:

Parametric Equivalents maintain identical electrical specifications across all key parameters including voltage, current, forward voltage drop, reverse leakage current, and operating temperature range. These parts are direct functional replacements with no circuit redesign required.

Similar Parts share the same voltage and current ratings but may differ in secondary parameters such as reverse leakage current, forward voltage characteristics, capacitance, or operating temperature range. Similar parts require engineering evaluation to confirm suitability for the specific application.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Ir @ Vr	Package	Product Status	Grade
MBRX0540-TP	Micro Commercial Co	40 V	500 mA	550 mV @ 500 mA	300 µA @ 40 V	SOD-323	Obsolete	Standard
B0540WS-TP	Micro Commercial Co	40 V	500 mA	550 mV @ 500 mA	80 µA @ 40 V	SOD-323	Active	Standard
B0540WSHE3-TP	Micro Commercial Co	40 V	500 mA	550 mV @ 500 mA	80 µA @ 40 V	SOD-323	Active	Automotive (AEC-Q101)
B0540WS-7	Diodes Incorporated	40 V	500 mA	550 mV @ 500 mA	5 µA @ 30 V	SOD-323	Active	Standard
BAT165E6327HTSA1	Infineon Technologies	40 V	750 mA	740 mV @ 750 mA	50 µA @ 40 V	SOD-323	Active	Standard
BAT54JFILM	STMicroelectronics	40 V	300 mA	900 mV @ 100 mA	1 µA @ 30 V	SOD-323	Active	Standard
NSVRB751V40T1G	onsemi	30 V	30 mA	370 mV @ 1 mA	500 nA @ 30 V	SOD-323	Active	Automotive (AEC-Q101)
PMEG4005AEA,115	Nexperia USA Inc.	40 V	500 mA	470 mV @ 500 mA	100 µA @ 40 V	SOD-323	Active	Standard
RB400VAM-50TR	Rohm Semiconductor	50 V	500 mA	550 mV @ 500 mA	50 µA @ 30 V	TUMD2M	Active	Standard

Engineering Selection Recommendations

Parametric Equivalent Selection:

B0540WS-TP and B0540WSHE3-TP are parametric equivalents of the MBRX0540-TP with active product status. Both parts maintain the specified 40 V voltage rating, 500 mA current rating, and 550 mV forward voltage drop. B0540WSHE3-TP includes automotive grade qualification (AEC-Q101), making it suitable for applications requiring automotive-level reliability. The lower reverse leakage current (80 µA versus 300 µA) in both B0540 variants represents an improvement over the original specification.

Similar Part Selection:

PMEG4005AEA,115 (Nexperia) matches the 40 V / 500 mA specifications with improved forward voltage characteristics (470 mV @ 500 mA). This part is suitable for applications where lower forward voltage drop is beneficial for thermal management.

B0540WS-7 (Diodes Incorporated) meets the 40 V / 500 mA requirements with significantly lower reverse leakage current (5 µA @ 30 V), suitable for low-leakage applications.

BAT165E6327HTSA1 (Infineon) provides higher current capability (750 mA) at the same 40 V rating, suitable for applications requiring additional current margin.

Not Recommended for Direct Substitution:

BAT54JFILM (STMicroelectronics) has reduced current rating (300 mA), making it unsuitable for 500 mA applications.

NSVRB751V40T1G (onsemi) has reduced voltage rating (30 V) and current rating (30 mA), making it unsuitable for this application.

RB400VAM-50TR (Rohm Semiconductor) uses a different package type (TUMD2M versus SOD-323), requiring PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can B0540WS-TP directly replace MBRX0540-TP in existing designs?

A: Yes. B0540WS-TP is a parametric equivalent with identical voltage (40 V), current (500 mA), and forward voltage (550 mV @ 500 mA) specifications. The part uses the same SOD-323 package and maintains the same operating temperature range (-55°C to 125°C). No circuit modifications are required.

Q: What is the difference between B0540WS-TP and B0540WSHE3-TP?

A: Both parts are parametric equivalents with identical electrical specifications. B0540WSHE3-TP includes automotive grade qualification (AEC-Q101), making it suitable for automotive applications requiring higher reliability standards. Standard industrial applications can use either part.

Q: Why is PMEG4005AEA,115 listed as a similar part rather than an equivalent?

A: PMEG4005AEA,115 has a lower forward voltage drop (470 mV @ 500 mA versus 550 mV @ 500 mA). While this represents an improvement, the different forward voltage characteristic requires verification that the application can tolerate this change, particularly in circuits sensitive to voltage drop variations.

Q: Can BAT165E6327HTSA1 be used as a substitute?

A: BAT165E6327HTSA1 can be used in applications where the 500 mA current requirement is not exceeded. However, this part is rated for 750 mA, providing additional current margin. The higher forward voltage at rated current (740 mV @ 750 mA) should be evaluated for thermal and circuit performance impact.

Q: Why is RB400VAM-50TR not recommended?

A: RB400VAM-50TR uses a different package type (TUMD2M, 2-SMD Flat Lead) compared to the SOD-323 package of MBRX0540-TP. This package difference requires PCB layout modification and is not a direct pin-compatible substitute.

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

A: This specification indicates the diode has fast reverse recovery characteristics with recovery time not exceeding 500 nanoseconds for currents greater than 200 mA. This parameter is critical for switching applications and high-frequency rectification circuits.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance, matching the environmental compliance status of the original MBRX0540-TP.

Q: What is the significance of the SOD-323 package specification?

A: SOD-323 is a surface mount package with standardized pin spacing and footprint. All recommended parametric equivalents use this same package, ensuring mechanical and electrical compatibility with existing PCB designs without layout modifications.

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