MBR440MFST3G Equivalent & Substitute Parts

Part Overview

The MBR440MFST3G is a Schottky rectifier diode manufactured by onsemi, rated for 40 V DC reverse voltage and 4 A average rectified current. This component is designed for surface mount applications in the 5-DFN (5x6) package configuration. The part is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications while offering alternative packaging formats or active product status.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	4 A
Voltage - Forward (Vf) (Max) @ If	650 mV @ 4 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	800 µA @ 40 V
Mounting Type	Surface Mount
Package / Case	8-PowerTDFN, 5 Leads
Supplier Device Package	5-DFN (5x6) (8-SOFL)
Operating Temperature - Junction	-55°C ~ 175°C
Technology	Schottky
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MBR440MFST3G is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 4 A
Voltage - Forward (Vf) (Max) @ If: 650 mV @ 4 A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 800 µA @ 40 V
Package / Case: 8-PowerTDFN, 5 Leads
Supplier Device Package: 5-DFN (5x6) (8-SOFL)
Operating Temperature - Junction: -55°C ~ 175°C
Technology: Schottky
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All identified substitute parts maintain identical electrical performance and mechanical compatibility. Variations exist only in product status (active versus obsolete) and packaging format (Cut Tape & Digi-Reel versus Tape & Reel). These packaging differences do not affect functional equivalence in circuit applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	Ir @ Vr	Package	Product Status	Packaging Format
MBR440MFST3G	onsemi	40 V	4 A	650 mV @ 4 A	Fast Recovery ≤ 500ns, > 200mA	800 µA @ 40 V	8-PowerTDFN, 5 Leads	Obsolete	Cut Tape (CT) & Digi-Reel®
MBR440MFST1G	onsemi	40 V	4 A	650 mV @ 4 A	Fast Recovery ≤ 500ns, > 200mA	800 µA @ 40 V	8-PowerTDFN, 5 Leads	Active	Not specified
NRVB440MFST1G	onsemi	40 V	4 A	650 mV @ 4 A	Fast Recovery ≤ 500ns, > 200mA	800 µA @ 40 V	8-PowerTDFN, 5 Leads	Obsolete	Cut Tape (CT) & Digi-Reel®
NRVB440MFST3G	onsemi	40 V	4 A	650 mV @ 4 A	Fast Recovery ≤ 500ns, > 200mA	800 µA @ 40 V	8-PowerTDFN, 5 Leads	Obsolete	Not specified
NRVB440MFSWFT1G	onsemi	40 V	4 A	650 mV @ 4 A	Fast Recovery ≤ 500ns, > 200mA	800 µA @ 40 V	8-PowerTDFN, 5 Leads	Active	Tape & Reel (TR)
NRVB440MFSWFT3G	onsemi	40 V	4 A	650 mV @ 4 A	Fast Recovery ≤ 500ns, > 200mA	800 µA @ 40 V	8-PowerTDFN, 5 Leads	Active	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Primary Recommendation for Active Product Status:

NRVB440MFSWFT3G is the preferred substitute for MBR440MFST3G. This part maintains full electrical and mechanical equivalence while offering active product status, ensuring long-term availability and manufacturing support. The Cut Tape & Digi-Reel packaging format provides compatibility with standard component handling and assembly processes.

Secondary Recommendation for Active Product Status:

NRVB440MFSWFT1G provides equivalent electrical and mechanical specifications with active product status. This part differs only in packaging format (Tape & Reel), which may be suitable for high-volume automated assembly operations.

Alternative for Active Product Status:

MBR440MFST1G offers active product status with identical electrical specifications. This part is suitable where packaging format is not a constraint.

Obsolete Product Alternatives:

NRVB440MFST1G and NRVB440MFST3G are functionally equivalent but retain obsolete status. These parts are suitable only for legacy system maintenance or where existing inventory is available.

All substitute parts comply with ROHS3 and maintain MSL 1 (Unlimited) moisture sensitivity classification, ensuring compatibility with standard storage and handling procedures.

Frequently Asked Questions (FAQ)

Q: Can MBR440MFST1G be used as a direct replacement for MBR440MFST3G?

A: Yes. MBR440MFST1G is electrically and mechanically equivalent to MBR440MFST3G. Both parts share identical voltage ratings (40 V), current ratings (4 A), forward voltage characteristics (650 mV @ 4 A), and package specifications (8-PowerTDFN, 5 Leads). The primary difference is product status: MBR440MFST1G is active while MBR440MFST3G is obsolete.

Q: What is the difference between NRVB440MFSWFT3G and NRVB440MFSWFT1G?

A: Both parts are electrically and mechanically identical with 40 V reverse voltage, 4 A current rating, and 5-DFN package configuration. The difference is packaging format: NRVB440MFSWFT3G is supplied in Cut Tape & Digi-Reel format, while NRVB440MFSWFT1G is supplied in Tape & Reel format. Both are active products.

Q: Why should I choose an active product over an obsolete one?

A: Active products have ongoing manufacturing support, extended availability, and predictable supply chains. Obsolete products have limited or no future availability and may experience price volatility or discontinuation without notice.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity classification, meeting standard environmental and handling requirements.

Q: Does the packaging format affect circuit performance?

A: No. Packaging format (Cut Tape & Digi-Reel versus Tape & Reel) affects only component handling, storage, and assembly processes. Electrical and thermal performance remain identical across all substitute parts.

Q: Can NRVB440MFSWFT3G replace MBR440MFST3G in existing designs?

A: Yes. NRVB440MFSWFT3G maintains full electrical equivalence (40 V, 4 A, 650 mV forward voltage, fast recovery characteristics) and mechanical compatibility (8-PowerTDFN, 5 Leads, 5-DFN package). The part operates across the same temperature range (-55°C to 175°C junction temperature) and maintains identical reverse leakage characteristics (800 µA @ 40 V).

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts operate across a junction temperature range of -55°C to 175°C, providing identical thermal performance specifications.

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