1N3735 Equivalent & Substitute Parts

Part Overview

The 1N3735 is a general-purpose rectifier diode manufactured by Microchip Technology, rated for 100 V DC reverse voltage and 275 A average rectified current in a stud mount DO-205AB (DO-9) package. This component is classified as Active product status and utilizes standard recovery technology. The 1N3735 is employed in high-current rectification applications requiring robust thermal management and reliable performance across industrial temperature ranges. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained, enabling procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	275	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 300 A	V
Speed - Recovery	Standard >500ns, >200mA (Io)	-
Current - Reverse Leakage @ Vr	75	µA @ 100 V
Mounting Type	Stud Mount	-
Package / Case	DO-205AB, DO-9, Stud	-
Operating Temperature - Junction	-65 to 190	°C
Technology	Standard	-
Product Status	Active	-

Substitute Part Grouping Explanation

Substitute parts for the 1N3735 are identified based on strict equivalence of critical electrical and mechanical parameters. The substitution criteria are:

Primary Equivalence Parameters:

Voltage - DC Reverse (Vr) (Max): 100 V
Current - Average Rectified (Io): 275 A
Voltage - Forward (Vf) (Max) @ If: 1.3 V @ 300 A
Speed - Recovery: Standard >500ns, >200mA (Io)
Mounting Type: Stud Mount
Package / Case: DO-205AB, DO-9, Stud
Operating Temperature - Junction: -65°C to 190°C
Technology: Standard

The 1N4045 meets all primary equivalence parameters and is therefore classified as a parametric equivalent. Both devices share identical voltage ratings, current ratings, forward voltage characteristics, recovery speed classification, stud mount configuration, and thermal operating range. Substitution is valid when these parameters are maintained within the application circuit.

Parameter Comparison

Parameter	1N3735	1N4045	Unit
Manufacturer	Microchip Technology	Microchip Technology	-
Category	Diodes, Rectifiers	Diodes, Rectifiers	-
Voltage - DC Reverse (Vr) (Max)	100	100	V
Current - Average Rectified (Io)	275	275	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 300 A	1.3 @ 300 A	V
Speed - Recovery	Standard >500ns, >200mA (Io)	Standard >500ns, >200mA (Io)	-
Current - Reverse Leakage @ Vr	75	15	µA @ 100 V
Mounting Type	Stud Mount	Stud Mount	-
Package / Case	DO-205AB, DO-9, Stud	DO-205AB, DO-9, Stud	-
Operating Temperature - Junction	-65 to 190	-65 to 190	°C
Technology	Standard	Standard	-
Product Status	Active	Active	-

Engineering Selection Recommendations

Both the 1N3735 and 1N4045 are Active product status components manufactured by Microchip Technology, ensuring ongoing availability and support. The 1N4045 demonstrates improved reverse leakage characteristics (15 µA versus 75 µA at 100 V), indicating enhanced leakage performance while maintaining all other electrical specifications. The 1N4045 carries RoHS3 compliance and Moisture Sensitivity Level (MSL) 1 (Unlimited) certification, providing additional environmental and handling advantages.

Selection between these parts depends on application requirements regarding reverse leakage current and compliance certifications. Both devices are electrically and mechanically interchangeable for applications where the specified parameters are the determining factors. The 1N4045 is suitable for applications requiring lower reverse leakage and enhanced environmental compliance.

Frequently Asked Questions (FAQ)

Q: Can the 1N4045 directly replace the 1N3735 in existing designs?

A: Yes. The 1N4045 is a parametric equivalent with identical voltage ratings (100 V), current ratings (275 A), forward voltage characteristics (1.3 V @ 300 A), recovery speed classification, stud mount configuration, and operating temperature range (-65°C to 190°C). Direct substitution is valid for applications where these parameters define the functional requirements.

Q: What is the difference in reverse leakage between these parts?

A: The 1N3735 exhibits 75 µA reverse leakage at 100 V, while the 1N4045 exhibits 15 µA reverse leakage at 100 V. The 1N4045 provides lower reverse leakage performance. Applications sensitive to leakage current may benefit from the 1N4045 specification.

Q: Are the package and mounting configurations identical?

A: Yes. Both the 1N3735 and 1N4045 utilize the DO-205AB (DO-9) stud mount package. Mechanical compatibility and thermal interface characteristics are equivalent, enabling direct physical substitution without board redesign.

Q: What compliance certifications apply to each part?

A: Both parts are REACH Unaffected and classified under ECCN EAR99. The 1N4045 additionally carries RoHS3 compliance and MSL 1 (Unlimited) certification, providing enhanced environmental and handling documentation.

Q: Are both parts currently available?

A: Yes. Both the 1N3735 and 1N4045 maintain Active product status. Current inventory levels are 1078 pieces (1N3735) and 973 pieces (1N4045) in new original condition.

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