MBR140ESFT1G Equivalent & Substitute Parts

Part Overview

The MBR140ESFT1G is an active Schottky rectifier diode manufactured by onsemi, rated for 40 V DC reverse voltage and 1 A average rectified current in a surface mount SOD-123FL package. This component is designed for fast recovery applications with switching speeds ≤ 500 ns at currents > 200 mA. The part is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1) and is currently in active production with substantial inventory availability.

Equivalent and substitute parts are identified when design requirements permit operation at higher current ratings, alternative package geometries, or when sourcing constraints necessitate component alternatives from different manufacturers while maintaining electrical performance within specified parameters.

Substiute Parts

MBR140ESFT1G

onsemiIn Stock: 100346MBR140ESFT1G Datasheet

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RBR2MM40BTR

Rohm SemiconductorIn Stock: 12385RBR2MM40BTR Datasheet

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RBR3MM40BTR

Rohm SemiconductorIn Stock: 2825RBR3MM40BTR Datasheet

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SL04-E3-18

Vishay General Semiconductor - Diodes DivisionIn Stock: 50438SL04-E3-18 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MBR140ESFT1G is permissible when the following electrical and mechanical parameters are maintained or exceeded:

Critical Parameters for Substitution:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40 V
• Technology: Must be Schottky diode type
• Speed: Must maintain Fast Recovery ≤ 500 ns at currents > 200 mA
• Mounting Type: Must be Surface Mount
• RoHS Status: Must be ROHS3 Compliant
• Moisture Sensitivity Level: Must be MSL 1 or equivalent

Parameters Permitting Variation:

• Current - Average Rectified (Io): May be equal to or greater than 1 A
• Voltage - Forward (Vf): May vary within manufacturer specifications at rated current
• Current - Reverse Leakage: May vary within acceptable limits
• Operating Temperature - Junction (Max): May be equal to or greater than 175°C
• Package / Case: May differ (SOD-123F, PMDU, DO-219AB acceptable for surface mount applications)

The three identified substitute parts (RBR2MM40BTR, RBR3MM40BTR, SL04-E3-18) satisfy all critical parameters while offering enhanced current ratings or alternative package options.

Parameter Comparison

Engineering Selection Recommendations

MBR140ESFT1G (onsemi): Select this part for applications requiring the original specification with 1 A current rating, SOD-123FL packaging, and maximum junction temperature of 175°C. This part maintains the widest operating temperature range and is suitable for high-temperature environments.

RBR2MM40BTR (Rohm Semiconductor): This substitute provides doubled current capacity (2 A) while maintaining 40 V reverse voltage rating and fast recovery characteristics. The PMDU package offers alternative PCB layout options. Maximum junction temperature is 150°C, which is acceptable for standard industrial applications. Select this part when higher current handling is required and thermal constraints permit operation at 150°C maximum.

RBR3MM40BTR (Rohm Semiconductor): This substitute provides tripled current capacity (3 A) for applications requiring maximum current handling within the 40 V rating. The PMDU package and 150°C maximum junction temperature apply the same constraints as RBR2MM40BTR. Select this part for high-current applications where thermal management is adequate.

SL04-E3-18 (Vishay General Semiconductor): This substitute provides 1.1 A current rating with superior reverse leakage characteristics (20 µA versus 30 µA) and lower forward voltage drop (540 mV versus 560 mV). The DO-219AB package offers a different footprint option. Maximum junction temperature matches the original at 175°C. Select this part when low leakage current and minimal forward voltage drop are design priorities, or when DO-219AB package geometry is preferred.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and fast recovery Schottky technology required for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can RBR2MM40BTR or RBR3MM40BTR be used as direct replacements for MBR140ESFT1G?

A: Yes, both Rohm parts are electrical and functional equivalents. The primary differences are increased current ratings (2 A and 3 A respectively) and reduced maximum junction temperature (150°C versus 175°C). PCB layout changes may be required due to PMDU package geometry differences from SOD-123FL. Verify PCB footprint compatibility before implementation.

Q: What is the impact of the lower maximum junction temperature (150°C) on Rohm substitute parts?

A: The 150°C maximum junction temperature limit applies to RBR2MM40BTR and RBR3MM40BTR. This is acceptable for standard industrial and commercial applications. Applications requiring sustained operation above 150°C junction temperature must use MBR140ESFT1G or SL04-E3-18, both rated to 175°C.

Q: How does the SL04-E3-18 differ in package footprint?

A: The SL04-E3-18 uses DO-219AB (SMF) package geometry, which differs from the SOD-123F package used by MBR140ESFT1G and Rohm substitutes. PCB footprint and land pattern modifications are required. The DO-219AB package is a standard surface mount option and does not affect electrical performance.

Q: Are there current rating limitations when substituting with higher-rated parts?

A: No. Substitute parts with higher current ratings (RBR2MM40BTR at 2 A, RBR3MM40BTR at 3 A) operate correctly at the original 1 A specification. The higher rating provides design margin and thermal headroom. Forward voltage drop and reverse leakage characteristics remain within specification at all current levels up to the rated maximum.

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

A: Reverse leakage varies among substitutes: MBR140ESFT1G at 30 µA, RBR2MM40BTR at 80 µA, RBR3MM40BTR at 100 µA, and SL04-E3-18 at 20 µA (all at 40 V). For most applications, these differences are negligible. Applications with strict leakage requirements should select SL04-E3-18 (lowest leakage) or retain MBR140ESFT1G.

Q: Can packaging differences affect circuit performance?

A: Package differences (SOD-123F, PMDU, DO-219AB) do not affect electrical performance. PCB layout, thermal management, and trace routing may require adjustment based on package geometry and lead configuration. Consult package datasheets for specific land pattern and thermal via requirements.

Q: Are all substitute parts available in equivalent quantities?

A: Inventory levels vary. MBR140ESFT1G has 100,300 pieces in stock. SL04-E3-18 has 50,372 pieces. RBR2MM40BTR has 12,300 pieces. RBR3MM40BTR has 2,804 pieces. Verify current inventory status for production volume requirements.

Q: Do all parts meet the same compliance standards?

A: Yes. All parts (MBR140ESFT1G, RBR2MM40BTR, RBR3MM40BTR, SL04-E3-18) are ROHS3 compliant, REACH unaffected, MSL 1 rated, and classified as EAR99 for export control purposes.