MBR2045MFST1G Equivalent & Substitute Parts

Part Overview

The MBR2045MFST1G is an active Schottky rectifier diode manufactured by onsemi, rated for 45 V DC reverse voltage and 20 A average rectified current in a surface mount 5-DFN (5x6) package. This component is designed for high-current rectification applications requiring fast recovery characteristics. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Substiute Parts

MBR2045MFST1G

onsemiIn Stock: 1141MBR2045MFST1G Datasheet

Current PartRFQ

V20KL45-M3/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 6841V20KL45-M3/H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MBR2045MFST1G are identified based on the following critical electrical and mechanical parameters:

Voltage Rating Compatibility: The substitute must maintain the same maximum DC reverse voltage (45 V) to ensure safe operation within the same circuit design envelope.

Package Compatibility: Both the main part and substitute must use compatible surface mount packages (8-PowerTDFN or equivalent FlatPAK form factors with 5x6 mm footprint dimensions) to allow direct board-level substitution.

Technology Class: Both parts must employ Schottky diode technology to maintain consistent forward voltage characteristics and fast recovery behavior.

Current Handling: While the MBR2045MFST1G is rated for 20 A average rectified current, substitute parts with lower current ratings (such as 5.4 A) may be considered for applications where the actual circuit current demand does not exceed the substitute's rating.

Thermal and Compliance Requirements: Both parts must meet ROHS3 compliance and maintain MSL 1 classification for manufacturing compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (MBR2045MFST1G): Use the MBR2045MFST1G when the application requires the full 20 A average rectified current rating, lower reverse leakage current (600 µA), and extended low-temperature operation down to -55°C. This part is active and ROHS3 compliant with MSL 1 classification.

Substitute Selection (V20KL45-M3/H): The V20KL45-M3/H from Vishay is suitable for applications where the actual circuit current demand does not exceed 5.4 A. This substitute maintains the same 45 V voltage rating, fast recovery characteristics, and compatible 5x6 mm surface mount footprint. The substitute carries AEC-Q101 automotive qualification and is ROHS3 compliant with MSL 1 classification. The operating temperature range is -40 to 150°C, which is narrower than the main part at the low end.

Both parts are active products with current inventory availability and meet all regulatory compliance requirements for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can the V20KL45-M3/H directly replace the MBR2045MFST1G on the PCB?

A: Yes, both parts use compatible 5x6 mm surface mount packages (8-PowerTDFN and FlatPAK) with identical footprints, allowing direct board-level substitution without layout modifications.

Q: What is the primary difference between these two parts?

A: The main difference is current rating. The MBR2045MFST1G is rated for 20 A average rectified current, while the V20KL45-M3/H is rated for 5.4 A. The substitute is suitable only for applications where circuit current does not exceed 5.4 A.

Q: Are both parts RoHS compliant?

A: Yes, both the MBR2045MFST1G and V20KL45-M3/H are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity classification.

Q: What is the difference in reverse leakage current?

A: The MBR2045MFST1G has 600 µA reverse leakage at 45 V, while the V20KL45-M3/H has 1 mA reverse leakage at 45 V. The main part exhibits lower leakage.

Q: Does the V20KL45-M3/H have automotive qualification?

A: Yes, the V20KL45-M3/H carries AEC-Q101 automotive qualification. The MBR2045MFST1G does not list automotive qualification in the provided specifications.

Q: What is the operating temperature difference?

A: The MBR2045MFST1G operates from -55 to 150°C, while the V20KL45-M3/H operates from -40 to 150°C. The main part supports lower temperature operation.

Q: Can I use the V20KL45-M3/H in a 20 A application?

A: No. The V20KL45-M3/H is rated for maximum 5.4 A average rectified current. Using it in a 20 A application would exceed its current rating and cause device failure.

Q: Are the forward voltage characteristics similar?

A: Yes, both parts exhibit similar forward voltage characteristics. The MBR2045MFST1G is rated at 610 mV @ 30 A, and the V20KL45-M3/H is rated at 600 mV @ 20 A, indicating comparable conduction behavior.

Q: Do both parts have the same fast recovery speed?

A: Yes, both parts are specified as Fast Recovery with recovery time ≤ 500 ns for currents > 200 mA (Io), ensuring consistent switching performance.