SF35-AP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The SF35-AP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 300V DC reverse voltage and 3A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity. The SF35-AP operates across a junction temperature range of -55°C to 125°C and complies with RoHS3 standards.

Substiute Parts

SF35-AP

Micro Commercial CoIn Stock: 1060SF35-AP Datasheet

Current PartRFQ

UF5403-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 998UF5403-E3/73 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SF35-AP is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

• Voltage - DC Reverse (Vr) (Max): 300V
• Current - Average Rectified (Io): 3A
• Package / Case: DO-201AD, Axial (through-hole mounting)
• Technology: Standard rectifier diode

Performance Characteristics:

• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• Operating Temperature Range: Minimum -55°C junction temperature
• RoHS3 Compliance: Required

The UF5403-E3/73 manufactured by Vishay General Semiconductor - Diodes Division meets all mandatory matching criteria and is classified as an active product, providing long-term availability and supply chain stability compared to the obsolete SF35-AP.

Parameter Comparison

Engineering Selection Recommendations

The UF5403-E3/73 is a direct substitute for the SF35-AP based on electrical and mechanical equivalence. Selection of this substitute is supported by the following factors:

Product Status: The UF5403-E3/73 is classified as an active product with confirmed inventory availability, whereas the SF35-AP is obsolete. This ensures long-term supply chain continuity and reduces procurement risk.

Compliance: Both components are ROHS3 compliant and carry identical Moisture Sensitivity Level (MSL) ratings of 1 (Unlimited), confirming compatibility with current manufacturing and storage requirements.

Electrical Performance: The UF5403-E3/73 meets or exceeds the electrical specifications of the SF35-AP. The forward voltage is lower (1V versus 1.3V @ 3A), and the operating temperature range is extended to 150°C maximum junction temperature, providing additional thermal margin. Reverse recovery time is slightly longer (50ns versus 35ns), remaining within the fast recovery classification.

Package Compatibility: Both components use the DO-201AD axial through-hole package, ensuring direct mechanical and electrical compatibility in existing PCB layouts without modification.

Frequently Asked Questions (FAQ)

Q: Can the UF5403-E3/73 be used as a direct replacement for the SF35-AP without circuit modification?

A: Yes. The UF5403-E3/73 is electrically and mechanically equivalent to the SF35-AP. Both components share identical voltage and current ratings (300V, 3A), the same DO-201AD package, and compatible operating temperature ranges. No circuit modification is required.

Q: What is the significance of the lower forward voltage in the UF5403-E3/73?

A: The UF5403-E3/73 exhibits a forward voltage of 1V at 3A compared to 1.3V for the SF35-AP. This represents improved efficiency and reduced power dissipation in the substitute component, which is a performance advantage in rectification applications.

Q: Does the extended temperature range of the UF5403-E3/73 affect compatibility?

A: No. The UF5403-E3/73 operates from -55°C to 150°C junction temperature, compared to -55°C to 125°C for the SF35-AP. The extended upper temperature limit provides additional thermal margin and does not create compatibility issues. Applications designed for the SF35-AP operate within the UF5403-E3/73 temperature specification.

Q: Are there differences in reverse recovery time between these components?

A: The UF5403-E3/73 has a reverse recovery time of 50ns compared to 35ns for the SF35-AP. Both components are classified as fast recovery diodes (≤ 500ns, > 200mA). The difference is within acceptable limits for standard rectification applications and does not affect functional compatibility.

Q: What is the impact of the higher reverse leakage current in the UF5403-E3/73?

A: The UF5403-E3/73 exhibits reverse leakage of 10µA at 300V compared to 5µA for the SF35-AP. This difference is typical among different manufacturers' rectifier diodes and remains within acceptable limits for general purpose rectification. Applications designed for the SF35-AP accommodate this specification.

Q: Are both components RoHS3 compliant?

A: Yes. Both the SF35-AP and UF5403-E3/73 are ROHS3 compliant and carry identical Moisture Sensitivity Level ratings (MSL 1, Unlimited), confirming compatibility with current manufacturing standards and storage requirements.

Q: Why is the SF35-AP classified as obsolete?

A: The SF35-AP is no longer in active production by Micro Commercial Co. The obsolete status indicates that new inventory from the original manufacturer is not available. The UF5403-E3/73 provides a functionally equivalent alternative from an active manufacturer with confirmed supply availability.