MBRX140-TP Equivalent & Substitute Parts

Part Overview

The MBRX140-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 40 V DC reverse voltage and 1 A average rectified current in a surface mount SOD-123 package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. Active alternatives with matching or superior electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	300	µA @ 40 V
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MBRX140-TP is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io): 1 A minimum
Technology: Schottky
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Package Compatibility:

SOD-123 package (primary) or SOD-123F (compatible variant)

Secondary Considerations:

Forward voltage (Vf) characteristics
Reverse leakage current
Operating temperature range
Product status (active preferred for obsolete parts)

Substitute parts are grouped into two categories: Direct Equivalents (matching voltage, current, and package specifications) and Functional Alternatives (meeting voltage and current requirements with different package or performance characteristics).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	Package	Reverse Leakage @ Vr	Product Status
MBRX140-TP	Micro Commercial Co	40 V	1 A	550 mV @ 1 A	SOD-123	300 µA @ 40 V	Obsolete
SM5819PL-TP	Micro Commercial Co	40 V	1 A	600 mV @ 1 A	SOD-123F	100 µA @ 40 V	Active
1N5819HW-7-F	Diodes Incorporated	40 V	1 A	450 mV @ 1 A	SOD-123	1 mA @ 40 V	Active
B140HW-7	Diodes Incorporated	40 V	1 A	550 mV @ 1 A	SOD-123	40 µA @ 40 V	Active
BAT48ZFILM	STMicroelectronics	40 V	350 mA	750 mV @ 200 mA	SOD-123	25 µA @ 40 V	Active
BAS70JFILM	STMicroelectronics	70 V	70 mA	1 V @ 15 mA	SOD-323	10 µA @ 70 V	Active
BAT20JFILM	STMicroelectronics	23 V	1 A	620 mV @ 1 A	SOD-323	12 µA @ 15 V	Active
BAT41ZFILM	STMicroelectronics	100 V	200 mA	1 V @ 200 mA	SOD-123	100 nA @ 50 V	Active
BAT46JFILM	STMicroelectronics	100 V	150 mA	450 mV @ 10 mA	SOD-323	5 µA @ 75 V	Active
BAT46ZFILM	STMicroelectronics	100 V	150 mA	1 V @ 250 mA	SOD-123	5 µA @ 75 V	Active
BAT48JFILM	STMicroelectronics	40 V	350 mA	750 mV @ 200 mA	SOD-323	25 µA @ 40 V	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

SM5819PL-TP (Micro Commercial Co): Active status, same manufacturer as original part, identical voltage and current ratings, SOD-123F package (compatible with SOD-123 footprint), lower reverse leakage current (100 µA vs. 300 µA), ROHS3 compliant.
1N5819HW-7-F (Diodes Incorporated): Active status, meets all electrical requirements, SOD-123 package, superior forward voltage performance (450 mV vs. 550 mV), ROHS3 compliant, high inventory availability.
B140HW-7 (Diodes Incorporated): Active status, identical forward voltage to original part (550 mV), SOD-123 package, significantly lower reverse leakage (40 µA vs. 300 µA), ROHS3 compliant.

Functional Alternatives (Application-Dependent):

BAT48ZFILM (STMicroelectronics): Meets 40 V / 1 A envelope with reduced current rating (350 mA), SOD-123 package, suitable for applications with lower current demands.
BAT41ZFILM (STMicroelectronics): Higher voltage rating (100 V), reduced current (200 mA), SOD-123 package, applicable for higher voltage circuits with lower current requirements.

All recommended substitutes maintain ROHS3 compliance, surface mount configuration, and Schottky technology. Selection between direct equivalents depends on specific circuit requirements for forward voltage drop and reverse leakage characteristics.

Frequently Asked Questions (FAQ)

Q: Can SM5819PL-TP replace MBRX140-TP in all applications?

A: SM5819PL-TP is a direct equivalent with identical voltage and current ratings. The SOD-123F package is compatible with SOD-123 PCB footprints. The lower reverse leakage current (100 µA vs. 300 µA) represents improved performance. Verify PCB layout compatibility with the SOD-123F variant before implementation.

Q: What is the difference between 1N5819HW-7-F and B140HW-7?

A: Both are 40 V / 1 A Schottky diodes in SOD-123 packages from Diodes Incorporated. The 1N5819HW-7-F has lower forward voltage (450 mV vs. 550 mV), resulting in reduced power dissipation. The B140HW-7 matches the original forward voltage specification (550 mV) and has lower reverse leakage (40 µA). Selection depends on whether forward voltage or leakage current is the critical parameter.

Q: Why are BAT46ZFILM and BAT48ZFILM listed as alternatives if they have different current ratings?

A: These parts exceed the 40 V voltage requirement and are listed as functional alternatives for applications where the 1 A current rating is not fully utilized. BAT48ZFILM (350 mA) and BAT46ZFILM (150 mA) are suitable for circuits with lower current demands. They are not direct replacements for 1 A applications.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed in this reference are ROHS3 compliant, matching the compliance status of the original MBRX140-TP.

Q: What is the significance of the SOD-123 versus SOD-123F package difference?

A: SOD-123F is a variant of SOD-123 with improved thermal characteristics. Both packages are mechanically and electrically compatible on standard SOD-123 PCB footprints. The SOD-123F variant (SM5819PL-TP) offers enhanced thermal performance without requiring PCB redesign.

Q: Can BAT20JFILM be used as a substitute despite the lower voltage rating (23 V)?

A: BAT20JFILM has a maximum reverse voltage of 23 V, which is below the 40 V requirement of the MBRX140-TP. This part is not suitable for direct substitution in circuits operating at or near 40 V. Use only in applications with confirmed maximum reverse voltage below 23 V.

Q: What is the operating temperature range consideration for substitution?

A: The original MBRX140-TP operates from -55°C to 125°C. Most active substitutes (SM5819PL-TP, 1N5819HW-7-F, B140HW-7) extend the lower temperature limit to -65°C, providing improved cold-temperature performance. STMicroelectronics parts (BAT series) specify 150°C maximum junction temperature. Verify application temperature requirements before selection.

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