MBR2045EMFST1G Equivalent & Substitute Parts

Part Overview

The MBR2045EMFST1G is a Schottky rectifier diode manufactured by onsemi, rated for 45 V DC reverse voltage and 20 A average rectified current in a 5-DFN (5x6) surface mount package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts may differ in current rating or packaging configuration while maintaining core voltage and thermal characteristics.

Key Parameters

Parameter	Value
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°C ~ 150°C
Technology	Schottky
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MBR2045EMFST1G is determined by the following critical parameters:

Parametric Equivalents maintain all electrical specifications: 45 V reverse voltage, 20 A average rectified current, 640 mV forward voltage drop at 20 A, fast recovery switching speed, and 400 µA reverse leakage current at 45 V. These parts are interchangeable at the circuit level and differ only in product status (active versus obsolete) or packaging configuration (bulk versus tape and reel).

Similar Substitutes maintain the 45 V reverse voltage rating and fast recovery Schottky technology but differ in average rectified current capacity (5.4 A versus 20 A) and reverse leakage characteristics (1 mA versus 400 µA at 45 V). These parts are suitable only for applications with reduced current requirements.

All substitute parts maintain identical mounting type (surface mount), package family (5-DFN/FlatPAK), operating temperature range (-55°C to 150°C or -40°C to 150°C), and RoHS3 compliance.

Parameter Comparison

Parameter	MBR2045EMFST1G	MBR2045EMFST3G	NRVB2045EMFST1G	NRVB2045EMFST3G	V20KL45-M3/H
Manufacturer	onsemi	onsemi	onsemi	onsemi	Vishay General Semiconductor - Diodes Division
Product Status	Obsolete	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V	45 V	45 V
Current - Average Rectified (Io)	20 A	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	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)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	400 µA @ 45 V	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	Surface Mount
Package / Case	8-PowerTDFN, 5 Leads	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)	5-DFN (5x6) (8-SOFL)	FlatPAK (5x6)
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-40°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Packaging	Bulk	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended for Drop-In Replacement)

MBR2045EMFST3G, NRVB2045EMFST1G, and NRVB2045EMFST3G are parametric equivalents with identical electrical performance to the MBR2045EMFST1G. All three parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating. Selection among these three should be based on packaging format availability: MBR2045EMFST3G is supplied in bulk, while NRVB2045EMFST1G and NRVB2045EMFST3G are supplied in tape and reel format. The NRVB series represents the current active product line from onsemi for this specification.

Similar Substitute (Current-Limited Applications)

V20KL45-M3/H from Vishay General Semiconductor is a similar substitute suitable only for applications with maximum current requirements of 5.4 A or less. This part maintains the 45 V reverse voltage rating, fast recovery switching speed, and RoHS3 compliance. The V20KL45-M3/H features a lower forward voltage drop (600 mV versus 640 mV at 20 A) and higher reverse leakage current (1 mA versus 400 µA at 45 V). This part includes automotive qualification (AEC-Q101) and operates over a narrower junction temperature range (-40°C to 150°C versus -55°C to 150°C). The V20KL45-M3/H is not suitable for applications requiring the full 20 A current capacity of the original part.

Frequently Asked Questions (FAQ)

Q: Can MBR2045EMFST3G be used as a direct replacement for MBR2045EMFST1G?

A: Yes. MBR2045EMFST3G is a parametric equivalent with identical electrical specifications (45 V, 20 A, 640 mV forward voltage, 400 µA reverse leakage). The primary difference is product status (active versus obsolete) and packaging format (bulk versus tape and reel). Both parts are ROHS3 compliant with unlimited moisture sensitivity rating.

Q: What is the difference between MBR2045EMFST3G and NRVB2045EMFST3G?

A: Both parts are parametric equivalents with identical electrical specifications and active product status. The primary difference is the base product number: MBR2045 versus NRVB2045. Both are supplied in tape and reel format with ROHS3 compliance. The NRVB series represents onsemi's current active product line for this specification.

Q: Can V20KL45-M3/H replace MBR2045EMFST1G in all applications?

A: No. V20KL45-M3/H is a similar substitute suitable only for applications with maximum current requirements of 5.4 A or less. The original MBR2045EMFST1G is rated for 20 A average rectified current. V20KL45-M3/H maintains the 45 V reverse voltage rating and fast recovery switching speed but cannot support the full current capacity of the original part.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. MBR2045EMFST3G, NRVB2045EMFST1G, NRVB2045EMFST3G, and V20KL45-M3/H are all ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Q: What is the difference between bulk and tape & reel packaging?

A: Bulk packaging (MBR2045EMFST1G and MBR2045EMFST3G) is supplied in standard packaging for manual handling and lower-volume applications. Tape and reel packaging (NRVB2045EMFST1G, NRVB2045EMFST3G, and V20KL45-M3/H) is supplied on continuous tape for automated pick-and-place assembly equipment. Electrical performance is identical; packaging format selection depends on manufacturing process requirements.

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

A: Yes. V20KL45-M3/H includes AEC-Q101 automotive qualification. The original MBR2045EMFST1G and its parametric equivalents do not specify automotive qualification in the provided data.

Q: What is the operating temperature range difference between MBR2045EMFST1G and V20KL45-M3/H?

A: MBR2045EMFST1G and its parametric equivalents (MBR2045EMFST3G, NRVB2045EMFST1G, NRVB2045EMFST3G) operate from -55°C to 150°C junction temperature. V20KL45-M3/H operates from -40°C to 150°C. Applications requiring operation below -40°C junction temperature must use the original part or its parametric equivalents.

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