NRVB440MFST3G Equivalent & Substitute Parts

Part Overview

The NRVB440MFST3G is a Schottky rectifier diode manufactured by onsemi, rated for 40 V DC reverse voltage and 4 A average rectified current in a 5-DFN (5x6) surface mount package. This component is classified as obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements for applications utilizing this diode topology.

Key Parameters

Parameter	Value
Manufacturer Part Number	NRVB440MFST3G
Manufacturer	onsemi
Category	Diodes, Rectifiers
Technology	Schottky
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 ≤ 500 ns, > 200 mA (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
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the NRVB440MFST3G are classified based on electrical and mechanical parameter compatibility. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 4 A or higher
Technology: Schottky
Mounting Type: Surface Mount
Package / Case: 8-PowerTDFN, 5 Leads
Supplier Device Package: 5-DFN (5x6) (8-SOFL)

Substitution Categories:

Parametric Equivalents (Identical Electrical Ratings): Parts with matching 40 V reverse voltage and 4 A current ratings, identical forward voltage characteristics, and identical package specifications. These parts are direct functional replacements with no circuit redesign required.

Manufacturer Recommended Upgrade (Higher Current Rating): NRVB540MFST1G provides 5 A current rating while maintaining 40 V reverse voltage and identical package form factor. This part offers enhanced current capacity and improved forward voltage performance (580 mV @ 5 A versus 650 mV @ 4 A).

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and identical thermal operating ranges or superior specifications.

Parameter Comparison

Parameter	NRVB440MFST3G (Main)	NRVB540MFST1G (MFR Recommended)	MBR440MFST1G (Parametric Equiv.)	MBR440MFST3G (Parametric Equiv.)	NRVB440MFST1G (Parametric Equiv.)	NRVB440MFSWFT1G (Parametric Equiv.)	NRVB440MFSWFT3G (Parametric Equiv.)
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	40 V	40 V	40 V	40 V
Current - Average Rectified (Io)	4 A	5 A	4 A	4 A	4 A	4 A	4 A
Voltage - Forward (Vf) (Max) @ If	650 mV @ 4 A	580 mV @ 5 A	650 mV @ 4 A	650 mV @ 4 A	650 mV @ 4 A	650 mV @ 4 A	650 mV @ 4 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	800 µA @ 40 V	2 mA @ 40 V	800 µA @ 40 V	800 µA @ 40 V	800 µA @ 40 V	800 µA @ 40 V	800 µA @ 40 V
Mounting Type	Surface Mount	Surface Mount	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, 5 Leads	8-PowerTDFN, 5 Leads	8-PowerTDFN, 5 Leads
Supplier Device Package	5-DFN (5x6) (8-SOFL)	5-DFN (5x6) (8-SOFL)	5-DFN (5x6) (8-SOFL)	5-DFN (5x6) (8-SOFL)	5-DFN (5x6) (8-SOFL)	5-DFN (5x6) (8-SOFL)	5-DFN (5x6) (8-SOFL)
Operating Temperature - Junction	-55°C ~ 175°C	-40°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C
Product Status	Obsolete	Active	Active	Obsolete	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

Select from the following active product status parts for immediate substitution without circuit modification:

NRVB440MFSWFT1G (Tape & Reel packaging, 9,767 pcs inventory)
NRVB440MFSWFT3G (Cut Tape & Digi-Reel packaging, 19,987 pcs inventory)

Both parts maintain identical electrical ratings (40 V, 4 A, 650 mV forward voltage) and thermal operating range (-55°C to 175°C). These selections provide the highest inventory availability and active product status, ensuring long-term supply continuity.

For Enhanced Performance (Recommended Upgrade):

NRVB540MFST1G (Manufacturer Recommended, Active Status, 4,600 pcs inventory) provides superior electrical characteristics:

Increased current rating: 5 A (versus 4 A)
Improved forward voltage: 580 mV @ 5 A (versus 650 mV @ 4 A)
Identical 40 V reverse voltage rating
Identical package and thermal range (-40°C to 175°C minimum)

This upgrade is suitable for applications requiring enhanced current capacity or reduced forward voltage losses. The part is pin-compatible and requires no PCB redesign.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage processes. All parts carry identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications.

Frequently Asked Questions (FAQ)

Q: Can NRVB440MFSWFT1G and NRVB440MFSWFT3G be used interchangeably with NRVB440MFST3G?

A: Yes. Both parts are parametric equivalents with identical electrical specifications (40 V reverse voltage, 4 A current rating, 650 mV forward voltage) and identical package form factor (5-DFN 5x6). The difference is packaging format: NRVB440MFSWFT1G is supplied in Tape & Reel, while NRVB440MFSWFT3G is supplied in Cut Tape & Digi-Reel. Both are active product status, ensuring supply availability.

Q: What is the difference between the MBR440 and NRVB440 series?

A: Both series are onsemi Schottky rectifier diodes with identical electrical ratings (40 V, 4 A, 650 mV forward voltage) and package specifications (5-DFN 5x6). The primary difference is the product line designation. MBR440MFST1G and MBR440MFST3G are functionally equivalent to NRVB440 variants. Selection between series is based on availability and packaging requirements.

Q: Is NRVB540MFST1G a direct replacement for NRVB440MFST3G?

A: NRVB540MFST1G is a manufacturer-recommended upgrade, not a direct replacement. While it maintains the same 40 V reverse voltage rating and identical package form factor, it provides enhanced specifications: 5 A current rating (versus 4 A) and 580 mV forward voltage (versus 650 mV). This part is suitable for applications where increased current capacity or reduced forward voltage losses are beneficial. No circuit redesign is required due to pin compatibility.

Q: What is the significance of the packaging suffix (MFST3G versus MFSWFT1G)?

A: The packaging suffix indicates the distribution format. MFST3G denotes Cut Tape & Digi-Reel packaging, while MFSWFT1G denotes Tape & Reel packaging. Both formats contain identical components with identical electrical specifications. Selection is based on manufacturing process requirements and inventory management preferences.

Q: Why is NRVB440MFST3G classified as obsolete?

A: Obsolete product status indicates that onsemi has discontinued active production and support for this specific part number variant. However, parametric equivalents with active status (NRVB440MFSWFT1G, NRVB440MFSWFT3G) are available with identical specifications. For new designs or long-term production, active status parts are recommended to ensure sustained supply chain support.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing processes and environmental regulations.

Q: What is the operating temperature range difference between NRVB540MFST1G and other substitutes?

A: NRVB540MFST1G operates from -40°C to 175°C junction temperature, while NRVB440 variants operate from -55°C to 175°C. The NRVB540 has a higher minimum operating temperature by 15°C. For applications requiring operation below -40°C, NRVB440 variants are required.

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