MBR2045EMFST3G Equivalent & Substitute Parts

Part Overview

The MBR2045EMFST3G is an active Schottky rectifier diode manufactured by onsemi, designed for surface mount applications requiring 45 V reverse voltage rating and 20 A average rectified current capacity. This component operates across a junction temperature range of -55°C to 150°C and is packaged in a 5-DFN (5x6) surface mount configuration. The part is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) and REACH unaffected status.

Equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity while maintaining electrical and mechanical compatibility within specified parameters.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	45	V
Current - Average Rectified (Io)	20	A
Voltage - Forward (Vf) (Max) @ If	640	mV @ 20 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	400	µA @ 45 V
Mounting Type	Surface Mount	—
Package / Case	8-PowerTDFN, 5 Leads	—
Supplier Device Package	5-DFN (5x6) (8-SOFL)	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—
REACH Status	REACH Unaffected	—

Substitute Part Grouping Explanation

Substitute parts for the MBR2045EMFST3G are classified into two categories based on electrical and mechanical parameter alignment:

Parametric Equivalents (Direct Substitutes): Parts NRVB2045EMFST3G and NRVB2045EMFST1G are parametric equivalents manufactured by onsemi. These parts match all critical electrical specifications including 45 V reverse voltage rating, 20 A average rectified current, 640 mV forward voltage at 20 A, and fast recovery speed characteristics. Both are packaged in identical 5-DFN (5x6) surface mount configurations with matching thermal and environmental ratings. The primary distinction between these equivalents is packaging format: MBR2045EMFST3G and NRVB2045EMFST3G are supplied in Tape & Reel format, while NRVB2045EMFST1G is also Tape & Reel packaged. All three parts share the same base product number series and compliance certifications.

Similar Alternative (Functional Substitute): Part V20KL45-M3/H manufactured by Vishay General Semiconductor - Diodes Division is classified as a similar alternative. This part shares the 45 V reverse voltage rating and fast recovery speed characteristics. However, it differs in current capacity (5.4 A average rectified current versus 20 A), forward voltage specification (600 mV @ 20 A), reverse leakage current (1 mA @ 45 V versus 400 µA @ 45 V), and operating temperature range (-40°C to 150°C versus -55°C to 150°C). The V20KL45-M3/H is qualified to AEC-Q101 automotive standards and includes additional capacitance specification (3400 pF @ 4V, 1MHz). This part is suitable only for applications where the reduced current capacity and modified electrical characteristics are acceptable.

Parameter Comparison

Parameter	MBR2045EMFST3G	NRVB2045EMFST3G	NRVB2045EMFST1G	V20KL45-M3/H
Manufacturer	onsemi	onsemi	onsemi	Vishay General Semiconductor - Diodes Division
Technology	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V
Current - Average Rectified (Io)	20 A	20 A	20 A	5.4 A
Voltage - Forward (Vf) (Max) @ If	640 mV @ 20 A	640 mV @ 20 A	640 mV @ 20 A	600 mV @ 20 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	400 µA @ 45 V	400 µA @ 45 V	400 µA @ 45 V	1 mA @ 45 V
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-PowerTDFN, 5 Leads	8-PowerTDFN, 5 Leads	8-PowerTDFN, 5 Leads	8-PowerTDFN
Supplier Device Package	5-DFN (5x6) (8-SOFL)	5-DFN (5x6) (8-SOFL)	5-DFN (5x6) (8-SOFL)	FlatPAK (5x6)
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-40°C to 150°C
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For Direct Substitution: Parts NRVB2045EMFST3G and NRVB2045EMFST1G are suitable for direct substitution with MBR2045EMFST3G in applications requiring identical electrical performance and thermal characteristics. All three parts maintain active product status, ROHS3 compliance, and REACH unaffected designation. The onsemi parametric equivalents are interchangeable at the circuit level with no design modifications required.

For Alternative Applications: Part V20KL45-M3/H is suitable only for applications where the reduced current capacity of 5.4 A is acceptable and where the extended lower operating temperature limit of -40°C (versus -55°C) does not present a constraint. This Vishay part carries AEC-Q101 automotive qualification, making it appropriate for automotive-grade applications. The higher reverse leakage current (1 mA versus 400 µA) must be evaluated against circuit requirements. The V20KL45-M3/H is not a direct substitute and requires circuit-level evaluation before implementation.

All substitute parts maintain compliance with ROHS3 and REACH requirements, ensuring regulatory alignment with the original MBR2045EMFST3G specification.

Frequently Asked Questions (FAQ)

Q: Can NRVB2045EMFST3G and NRVB2045EMFST1G be used interchangeably with MBR2045EMFST3G?

A: Yes. Both NRVB2045EMFST3G and NRVB2045EMFST1G are parametric equivalents with identical electrical specifications, including 45 V reverse voltage, 20 A average rectified current, 640 mV forward voltage at 20 A, and fast recovery characteristics. All three parts are packaged in 5-DFN (5x6) surface mount configurations and share matching thermal and compliance ratings. No circuit modifications are required for substitution.

Q: What are the key differences between the onsemi parametric equivalents and the Vishay V20KL45-M3/H?

A: The primary differences are current capacity and operating temperature range. The onsemi parts (MBR2045EMFST3G, NRVB2045EMFST3G, NRVB2045EMFST1G) are rated for 20 A average rectified current with -55°C to 150°C junction temperature operation. The Vishay V20KL45-M3/H is rated for 5.4 A average rectified current with -40°C to 150°C junction temperature operation. Additionally, the Vishay part has higher reverse leakage current (1 mA versus 400 µA at 45 V) and carries AEC-Q101 automotive qualification.

Q: Is the V20KL45-M3/H suitable as a direct replacement for MBR2045EMFST3G?

A: No. The V20KL45-M3/H is not a direct replacement due to reduced current capacity (5.4 A versus 20 A). This part is classified as a similar alternative and is suitable only for applications where the lower current rating is acceptable. Circuit-level evaluation is required before implementation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. MBR2045EMFST3G, NRVB2045EMFST3G, NRVB2045EMFST1G, and V20KL45-M3/H are all ROHS3 compliant with REACH unaffected status, ensuring regulatory alignment across all substitute options.

Q: What is the difference between MBR2045EMFST3G and NRVB2045EMFST3G packaging?

A: Both parts are supplied in Tape & Reel (TR) format with identical 5-DFN (5x6) surface mount package specifications. The primary distinction is the base product number series (MBR versus NRVB), which reflects different onsemi product lines. Electrical and mechanical specifications are identical.

Q: Can the V20KL45-M3/H be used in applications requiring -55°C operation?

A: No. The V20KL45-M3/H has a minimum operating temperature of -40°C, whereas the MBR2045EMFST3G and onsemi equivalents operate down to -55°C. Applications requiring -55°C operation must use the onsemi parts.

Q: What is the moisture sensitivity level for all substitute parts?

A: All parts listed (MBR2045EMFST3G, NRVB2045EMFST3G, NRVB2045EMFST1G, and V20KL45-M3/H) have Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity constraints during storage and handling.

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