MBR340G Equivalent & Substitute Parts

Part Overview

The MBR340G is a Schottky rectifier diode manufactured by onsemi, rated for 40 V DC reverse voltage and 3 A average rectified current in a through-hole axial package (DO-201AA/DO-27). This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The MBR340G serves as a fast recovery rectifier suitable for power supply and switching applications where low forward voltage drop and rapid switching characteristics are required.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	600 µA @ 40 V
Mounting Type	Through Hole
Package / Case	DO-201AA, DO-27, Axial
Operating Temperature - Junction	-65°C ~ 175°C
Technology	Schottky

Substitute Part Grouping Explanation

Substitution of the MBR340G is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 3 A
Technology: Schottky
Mounting Type: Through Hole
Package / Case: Axial configuration (DO-201AA, DO-27, DO-201AD)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Substitute parts range from 490 mV to 525 mV @ 3 A (main part: 600 mV)
Current - Reverse Leakage @ Vr: Substitute parts range from 100 µA to 500 µA @ 40 V (main part: 600 µA)
Operating Temperature - Junction: Substitute parts range from -65°C to -50°C minimum, and 125°C to 175°C maximum (main part: -65°C ~ 175°C)

All identified substitute parts maintain the core electrical ratings (40 V, 3 A) and fast recovery Schottky technology required for direct functional replacement in through-hole axial applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Tj (Operating)	Product Status	RoHS Status
MBR340G	onsemi	40 V	3 A	600 mV @ 3 A	600 µA @ 40 V	DO-201AA, DO-27, Axial	-65°C ~ 175°C	Obsolete	ROHS3 Compliant
1N5822	Microchip Technology	40 V	3 A	500 mV @ 3 A	100 µA @ 40 V	B, Axial	-65°C ~ 125°C	Active	RoHS non-compliant
1N5822-AP	Micro Commercial Co	40 V	3 A	525 mV @ 3 A	500 µA @ 40 V	DO-201AD, Axial	-55°C ~ 125°C	Active	Not specified
1N5822-TP	Micro Commercial Co	40 V	3 A	525 mV @ 3 A	500 µA @ 40 V	DO-201AD, Axial	-55°C ~ 125°C	Active	ROHS3 Compliant
1N5822H	Taiwan Semiconductor Corporation	40 V	3 A	525 mV @ 3 A	500 µA @ 40 V	DO-201AD, Axial	-55°C ~ 125°C	Active	ROHS3 Compliant
SB340-E3/54	Vishay General Semiconductor - Diodes Division	40 V	3 A	490 mV @ 3 A	500 µA @ 40 V	DO-201AD, Axial	-65°C ~ 125°C	Active	ROHS3 Compliant
SB340-E3/73	Vishay General Semiconductor - Diodes Division	40 V	3 A	490 mV @ 3 A	500 µA @ 40 V	DO-201AD, Axial	-65°C ~ 125°C	Active	ROHS3 Compliant
SB340E-G	Comchip Technology	40 V	3 A	500 mV @ 3 A	500 µA @ 40 V	DO-201AD, Axial	-65°C ~ 125°C	Active	ROHS3 Compliant
SR304-AP	Micro Commercial Co	40 V	3 A	500 mV @ 3 A	500 µA @ 40 V	DO-201AD, Axial	-50°C ~ 125°C	Active	Not specified
SR304-BP	Micro Commercial Co	40 V	3 A	500 mV @ 3 A	500 µA @ 40 V	DO-201AD, Axial	-50°C ~ 125°C	Active	Not specified

Engineering Selection Recommendations

Primary Selection Criteria:

All substitute parts listed maintain electrical equivalence at the 40 V, 3 A Schottky rectifier specification. Selection among active alternatives should prioritize the following factors based on provided data:

RoHS Compliance: Parts with ROHS3 Compliant status are preferred for new designs and applications subject to regulatory requirements. These include 1N5822-TP, 1N5822H, SB340-E3/54, SB340-E3/73, and SB340E-G.

Product Status: All substitute parts carry Active product status, ensuring ongoing availability and manufacturing support, in contrast to the obsolete MBR340G.

Operating Temperature Range: The MBR340G operates to 175°C maximum junction temperature. Substitute parts with reduced maximum operating temperature (-55°C to -50°C minimum, 125°C maximum) may require thermal design review for applications requiring the full -65°C to 175°C range. SB340-E3/54 and SB340-E3/73 maintain the -65°C minimum specification.

Forward Voltage Characteristics: Substitute parts exhibit lower forward voltage drop (490 mV to 525 mV @ 3 A) compared to the main part (600 mV @ 3 A), resulting in reduced power dissipation and improved efficiency in rectification applications.

Reverse Leakage Current: Substitute parts demonstrate lower reverse leakage current (100 µA to 500 µA @ 40 V) compared to the main part (600 µA @ 40 V), indicating improved blocking characteristics.

Frequently Asked Questions (FAQ)

Q: Can I directly replace MBR340G with any of the listed substitute parts?

A: Yes. All listed substitute parts maintain the critical electrical specifications: 40 V DC reverse voltage rating, 3 A average rectified current, Schottky technology, fast recovery switching characteristics, and through-hole axial mounting. Physical package compatibility exists across DO-201AA, DO-27, and DO-201AD axial configurations.

Q: What is the difference between the various 1N5822 variants (1N5822, 1N5822-AP, 1N5822-TP, 1N5822H)?

A: These represent the same base part number (1N5822) from different manufacturers or with different packaging configurations. 1N5822 is from Microchip Technology in bulk packaging. 1N5822-AP and 1N5822-TP are from Micro Commercial Co in bulk and cut tape formats respectively. 1N5822H is from Taiwan Semiconductor Corporation in tape and reel format. All maintain identical electrical specifications at 40 V, 3 A with fast recovery characteristics.

Q: Why does the MBR340G have higher forward voltage (600 mV) compared to substitute parts (490-525 mV)?

A: Forward voltage characteristics vary among manufacturers and process technologies. The lower forward voltage in substitute parts represents improved performance, resulting in lower power dissipation during rectification. This is an acceptable and beneficial variation for direct substitution.

Q: Are there temperature limitations I should consider when substituting?

A: The MBR340G operates from -65°C to 175°C junction temperature. Most substitute parts operate to 125°C maximum. If your application requires operation above 125°C, verify thermal management or select alternatives with higher temperature ratings. SB340-E3/54 and SB340-E3/73 maintain the -65°C minimum specification matching the original part.

Q: What is the significance of RoHS compliance status?

A: ROHS3 Compliant parts meet Restriction of Hazardous Substances regulations and are required for many commercial and industrial applications, particularly in Europe and regulated markets. Parts marked as RoHS non-compliant (such as 1N5822 from Microchip) may have restrictions on use in certain applications or regions.

Q: Can I use these parts interchangeably in my PCB design?

A: Yes, for through-hole axial mounting applications. All substitute parts use compatible axial package formats (DO-201AA, DO-27, DO-201AD) suitable for standard PCB through-hole pads. No PCB redesign is required for mechanical compatibility.

Q: Which substitute part offers the best overall performance?

A: Selection depends on application requirements. SB340-E3/54 and SB340-E3/73 from Vishay offer the lowest forward voltage (490 mV @ 3 A), ROHS3 compliance, and extended temperature range (-65°C to 125°C). 1N5822H from Taiwan Semiconductor Corporation provides ROHS3 compliance with tape and reel packaging suitable for automated assembly.

Q: What is the difference between cut tape (CT) and tape and reel (TR) packaging?

A: Cut tape (CT) packaging provides components in smaller quantities on adhesive tape, suitable for manual assembly or small production runs. Tape and reel (TR) packaging provides components on continuous reel format, optimized for automated pick-and-place assembly equipment in high-volume production.

Q: Are there any reverse leakage current considerations for my application?

A: The MBR340G specifies 600 µA reverse leakage at 40 V. Substitute parts range from 100 µA to 500 µA at the same rating. Lower reverse leakage improves blocking performance and reduces standby current in power supply applications. This represents an acceptable and beneficial variation.

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