MBR735G Equivalent & Substitute Parts

Part Overview

The MBR735G is a Schottky rectifier diode manufactured by onsemi, rated for 35 V DC reverse voltage and 7.5 A average rectified current in a Through Hole TO-220-2 package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain functional compatibility across critical electrical parameters while meeting current product availability and compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	35	V
Current - Average Rectified (Io)	7.5	A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 15 A	mV @ A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	100	µA @ 35 V
Mounting Type	Through Hole	-
Package / Case	TO-220-2	-
Operating Temperature - Junction	-65 to 175	°C
Technology	Schottky	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the MBR735G are selected based on the following critical parameters that determine functional equivalence:

Primary Selection Criteria:

Voltage - DC Reverse (Vr) (Max): Substitute must equal or exceed 35 V
Current - Average Rectified (Io): Substitute must equal or exceed 7.5 A
Technology: Schottky rectifier diode
Mounting Type: Through Hole
Package / Case: TO-220-2 or compatible TO-220AC variant
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compliance Criteria:

RoHS3 Compliance
Operating Temperature Range: -65°C to 175°C minimum
Moisture Sensitivity Level (MSL): 1 (Unlimited)

The identified substitute parts meet or exceed the electrical specifications of the MBR735G while maintaining mechanical compatibility and regulatory compliance.

Parameter Comparison

Parameter	MBR735G (onsemi)	MBR745-E3/45 (Vishay)	SRA1040 (Taiwan Semiconductor)
Voltage - DC Reverse (Vr) (Max)	35 V	45 V	40 V
Current - Average Rectified (Io)	7.5 A	7.5 A	10 A
Voltage - Forward (Vf) (Max) @ If	840 mV @ 15 A	840 mV @ 15 A	550 mV @ 10 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 35 V	100 µA @ 45 V	500 µA @ 40 V
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-2	TO-220-2	TO-220-2
Operating Temperature - Junction	-65°C to 175°C	-65°C to 175°C	-55°C to 125°C
Technology	Schottky	Schottky	Schottky
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

MBR745-E3/45 (Vishay General Semiconductor - Diodes Division)

The MBR745-E3/45 is a direct functional equivalent with identical current rating (7.5 A) and forward voltage characteristics (840 mV @ 15 A). The higher reverse voltage rating (45 V versus 35 V) provides additional design margin. This part maintains full compatibility with the MBR735G across all critical electrical parameters, identical operating temperature range (-65°C to 175°C), and equivalent RoHS3 compliance. Product status is Active, ensuring long-term availability. Selection of this substitute is appropriate for applications requiring direct replacement with enhanced voltage headroom.

SRA1040 (Taiwan Semiconductor Corporation)

The SRA1040 exceeds the MBR735G specifications in both reverse voltage (40 V) and average rectified current (10 A). Forward voltage performance is superior (550 mV @ 10 A). This part is suitable for applications where increased current capacity or improved efficiency is beneficial. Operating temperature range is reduced (-55°C to 125°C), which may limit suitability for applications requiring the full -65°C to 175°C range of the original part. Reverse leakage current is higher (500 µA @ 40 V versus 100 µA @ 35 V). Product status is Active. This substitute is appropriate when higher current ratings or lower forward voltage drop are design requirements.

Frequently Asked Questions (FAQ)

Q: Can the MBR745-E3/45 be used as a direct replacement for the MBR735G?

A: Yes. The MBR745-E3/45 maintains identical current rating (7.5 A), forward voltage characteristics (840 mV @ 15 A), operating temperature range (-65°C to 175°C), and package configuration (TO-220-2). The higher reverse voltage rating (45 V) is compatible with applications designed for 35 V operation.

Q: What are the differences between the MBR745-E3/45 and SRA1040?

A: Both parts exceed the MBR735G specifications. The MBR745-E3/45 maintains identical current and forward voltage ratings with identical operating temperature range. The SRA1040 provides higher current capacity (10 A versus 7.5 A) and lower forward voltage drop (550 mV @ 10 A), but operates over a reduced temperature range (-55°C to 125°C) and exhibits higher reverse leakage current (500 µA @ 40 V).

Q: Are all substitute parts in the same package?

A: All parts use Through Hole mounting in TO-220-2 or compatible TO-220AC package variants, ensuring mechanical compatibility with existing PCB layouts and thermal management designs.

Q: What compliance certifications apply to these substitute parts?

A: All parts listed are ROHS3 Compliant, REACH Unaffected, and classified under ECCN EAR99 with HTSUS code 8541.10.0080. Moisture Sensitivity Level is 1 (Unlimited) for all parts.

Q: Which substitute should be selected for applications requiring the full operating temperature range?

A: The MBR745-E3/45 maintains the identical operating temperature range (-65°C to 175°C) of the MBR735G. The SRA1040 operates only to -55°C minimum and 125°C maximum, making it unsuitable for applications requiring the full original temperature specification.

Q: How do reverse leakage currents compare across these parts?

A: The MBR735G and MBR745-E3/45 both specify 100 µA reverse leakage at their respective rated voltages. The SRA1040 specifies 500 µA @ 40 V, which is five times higher and may impact applications sensitive to leakage current performance.

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