MBR340RLG Equivalent & Substitute Parts

Part Overview

The MBR340RLG 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). The device features fast recovery characteristics with switching speed ≤ 500 ns for currents > 200 mA and operates across a junction temperature range of -65°C to 175°C.

The MBR340RLG is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production, repair, and maintenance applications. Substitute devices must maintain electrical compatibility within the specified voltage, current, and thermal operating parameters while accommodating packaging and compliance variations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	ns
Current - Reverse Leakage @ Vr	600	µA @ 40 V
Mounting Type	Through Hole	—
Package / Case	DO-201AA, DO-27, Axial	—
Operating Temperature - Junction	-65 to 175	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MBR340RLG is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

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

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Acceptable range 490 mV to 600 mV @ 3 A
Current - Reverse Leakage @ Vr: Acceptable range 100 µA to 1 mA @ rated voltage
Operating Temperature - Junction: Minimum -55°C to maximum 125°C or higher
RoHS Compliance: ROHS3 Compliant preferred for new designs

Substitute parts listed below meet all primary criteria and fall within acceptable secondary parameter ranges. Parts with higher voltage or current ratings are acceptable for direct substitution in applications designed for the MBR340RLG.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Tj Range [°C]	Package	Product Status	RoHS
MBR340RLG	onsemi	40	3	600 @ 3 A	600 @ 40 V	-65 to 175	DO-201AA, DO-27, Axial	Obsolete	ROHS3
1N5822	Microchip Technology	40	3	500 @ 3 A	100 @ 40 V	-65 to 125	B, Axial	Active	Non-compliant
1N5822-AP	Micro Commercial Co	40	3	525 @ 3 A	500 @ 40 V	-55 to 125	DO-201AD, Axial	Active	Not specified
1N5822-TP	Micro Commercial Co	40	3	525 @ 3 A	500 @ 40 V	-55 to 125	DO-201AD, Axial	Active	ROHS3
1N5822H	Taiwan Semiconductor Corporation	40	3	525 @ 3 A	500 @ 40 V	-55 to 125	DO-201AD, Axial	Active	ROHS3
SB340-E3/54	Vishay General Semiconductor - Diodes Division	40	3	490 @ 3 A	500 @ 40 V	-65 to 125	DO-201AD, Axial	Active	ROHS3
SB340-E3/73	Vishay General Semiconductor - Diodes Division	40	3	490 @ 3 A	500 @ 40 V	-65 to 125	DO-201AD, Axial	Active	ROHS3
SB340E-G	Comchip Technology	40	3	500 @ 3 A	500 @ 40 V	-65 to 125	DO-201AD, Axial	Active	ROHS3
SR304-AP	Micro Commercial Co	40	3	500 @ 3 A	500 @ 40 V	-50 to 125	DO-201AD, Axial	Active	Not specified
80SQ045NG	onsemi	45	8	550 @ 8 A	1000 @ 45 V	-65 to 175	DO-201AA, DO-27, Axial	Active	ROHS3

Engineering Selection Recommendations

Direct Electrical Equivalents (40 V, 3 A Rating):

The following parts provide direct electrical substitution for the MBR340RLG with identical voltage and current ratings:

1N5822-TP (Micro Commercial Co): Active product status, ROHS3 compliant, forward voltage 525 mV @ 3 A, operating temperature -55°C to 125°C, packaged in cut tape format
1N5822H (Taiwan Semiconductor Corporation): Active product status, ROHS3 compliant, forward voltage 525 mV @ 3 A, operating temperature -55°C to 125°C, packaged in tape and reel format
SB340-E3/54 (Vishay General Semiconductor - Diodes Division): Active product status, ROHS3 compliant, forward voltage 490 mV @ 3 A, operating temperature -65°C to 125°C, packaged in cut tape format
SB340-E3/73 (Vishay General Semiconductor - Diodes Division): Active product status, ROHS3 compliant, forward voltage 490 mV @ 3 A, operating temperature -65°C to 125°C, packaged in cut tape format
SB340E-G (Comchip Technology): Active product status, ROHS3 compliant, forward voltage 500 mV @ 3 A, operating temperature -65°C to 125°C, packaged in cut tape format

Compliance Considerations:

For new designs requiring ROHS3 compliance, select from: 1N5822-TP, 1N5822H, SB340-E3/54, SB340-E3/73, or SB340E-G. The Microchip Technology 1N5822 is not ROHS3 compliant and is suitable only for legacy applications.

Temperature Range Considerations:

The MBR340RLG operates to 175°C junction temperature. Most substitute parts operate to 125°C maximum. For applications requiring the full -65°C to 175°C range, the 80SQ045NG (45 V, 8 A) maintains this specification but exceeds the electrical requirements of the original design.

Higher-Rated Alternative:

The 80SQ045NG (onsemi) provides a higher-current alternative (8 A vs. 3 A) and higher voltage rating (45 V vs. 40 V) while maintaining the same junction temperature range (-65°C to 175°C) and ROHS3 compliance. This part is suitable for applications where the MBR340RLG is used in non-critical current paths or where design margin is required.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a higher voltage rating than the MBR340RLG?

A: Yes. A Schottky diode with a higher maximum reverse voltage rating (such as the 80SQ045NG at 45 V) is electrically compatible with applications designed for 40 V operation. The higher voltage rating provides additional design margin without affecting circuit performance at the lower voltage.

Q: Can I use a substitute part with a higher current rating than the MBR340RLG?

A: Yes. A Schottky diode with a higher average rectified current rating (such as the 80SQ045NG at 8 A) is electrically compatible with applications designed for 3 A operation. The higher current rating does not affect circuit performance in lower-current applications.

Q: What is the difference between DO-201AA, DO-27, and DO-201AD packages?

A: All three are through-hole axial packages suitable for the MBR340RLG application. DO-201AA and DO-27 are equivalent designations for the same physical package. DO-201AD is a variant of the same axial form factor. These packages are mechanically and electrically interchangeable for through-hole PCB assembly.

Q: Why do some substitute parts have lower forward voltage (Vf) than the MBR340RLG?

A: Forward voltage variation within the specified range (490 mV to 600 mV @ 3 A) is normal across different manufacturers and process technologies. Lower forward voltage (such as 490 mV in the SB340 series) indicates improved efficiency and reduced power dissipation compared to the original 600 mV specification. This is a beneficial characteristic in substitution.

Q: Is the Microchip Technology 1N5822 suitable for new designs?

A: The Microchip 1N5822 is electrically equivalent to the MBR340RLG but is not ROHS3 compliant. It is suitable for legacy applications and repair of existing equipment but is not recommended for new product designs requiring regulatory compliance.

Q: What is the significance of the operating temperature range difference between the MBR340RLG (-65°C to 175°C) and most substitute parts (-55°C to 125°C)?

A: The MBR340RLG supports a wider temperature range, particularly at the upper limit (175°C vs. 125°C). For applications operating near or above 125°C junction temperature, the MBR340RLG or the 80SQ045NG (which also supports -65°C to 175°C) must be used. For standard industrial applications operating below 125°C, substitute parts with the narrower range are fully compatible.

Q: Can I substitute the MBR340RLG with the 80SQ045NG in all applications?

A: Yes. The 80SQ045NG exceeds the electrical specifications of the MBR340RLG in both voltage (45 V vs. 40 V) and current (8 A vs. 3 A) ratings while maintaining the same junction temperature range and ROHS3 compliance. It is a direct functional substitute suitable for all applications designed for the MBR340RLG.

Q: What packaging format should I select for my application?

A: Select based on assembly method: Bulk packaging for manual assembly or small-quantity applications; Cut Tape (CT) for semi-automated pick-and-place assembly; Tape & Reel (TR) for high-volume automated assembly. All formats contain electrically identical devices; packaging selection affects only procurement and assembly logistics.

Q: Are there any reverse leakage current differences I should consider?

A: The MBR340RLG specifies 600 µA reverse leakage @ 40 V. Most substitute parts specify 500 µA @ 40 V, which is lower and represents improved performance. The Microchip 1N5822 specifies 100 µA, indicating superior leakage characteristics. For applications sensitive to reverse leakage, lower values are beneficial.

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