SF34G-AP Equivalent & Substitute Parts

Part Overview

The SF34G-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 200V DC reverse voltage and 3A average rectified current in a through-hole DO-201AD axial package. This component is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). The SF34G-AP serves applications requiring fast recovery rectification with reverse recovery time of 35 nanoseconds. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges for the intended application.

Substiute Parts

SF34G-AP

Micro Commercial CoIn Stock: 1149SF34G-AP Datasheet

Current PartRFQ

MUR420

Diotec SemiconductorIn Stock: 3749MUR420 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SF34G-AP is determined by equivalence in the following critical parameters:

Voltage Rating: The substitute part must maintain a DC reverse voltage (Vr) rating of 200V or greater to ensure safe operation in the same circuit topology.

Current Rating: The substitute part must support an average rectified current (Io) of 3A or greater. Parts with higher current ratings remain compatible as they represent increased capability within the same voltage class.

Recovery Characteristics: The substitute part must maintain fast recovery classification (≤ 500ns, > 200mA) with reverse recovery time (trr) of 35 nanoseconds or less to preserve switching performance in rectification circuits.

Reverse Leakage: The substitute part must maintain reverse leakage current (Ir) of 5 µA or less at the rated voltage to ensure equivalent blocking characteristics.

Mounting and Package: The substitute part must use through-hole axial mounting in a compatible DO-201 series package (DO-201AA or DO-201AD) to ensure mechanical fit in existing PCB designs.

Compliance: The substitute part must maintain ROHS3 compliance and REACH unaffected status to satisfy regulatory requirements.

Parameter Comparison

Engineering Selection Recommendations

The MUR420 manufactured by Diotec Semiconductor qualifies as a direct substitute for the SF34G-AP based on electrical parameter equivalence and mechanical compatibility.

Electrical Equivalence: Both parts maintain identical voltage ratings (200V DC reverse), identical reverse recovery time (35 ns), and identical reverse leakage current (5 µA @ 200V). The MUR420 provides higher average rectified current capacity (4A versus 3A), which represents increased design margin without introducing incompatibility. Forward voltage drop is lower in the MUR420 (890 mV @ 4A versus 950 mV @ 3A), resulting in reduced power dissipation.

Mechanical Compatibility: Both parts use through-hole axial mounting in compatible DO-201 series packages. The MUR420 is available in DO-201AA and DO-27 variants, both of which are mechanically compatible with DO-201AD footprints in standard PCB designs.

Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements. The MUR420 operates across a wider junction temperature range (-50°C to 175°C versus -65°C to 150°C), providing extended thermal operating margin.

Product Status: Both parts are classified as Active, ensuring continued availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the MUR420 be used as a direct replacement for the SF34G-AP in existing designs?

A: Yes. The MUR420 meets or exceeds all critical electrical parameters (voltage rating, current capacity, recovery time, and leakage current) and uses compatible through-hole axial packaging. No circuit modifications are required.

Q: What is the significance of the higher current rating in the MUR420?

A: The MUR420 is rated for 4A average rectified current compared to the SF34G-AP at 3A. This higher rating provides additional design margin and allows the substitute to handle transient current spikes without exceeding its rated capacity. The part remains fully compatible in applications designed for 3A operation.

Q: Are there package compatibility concerns between DO-201AD and DO-201AA?

A: No. Both DO-201AD and DO-201AA are variants within the DO-201 axial package family with identical lead spacing and through-hole mounting characteristics. They are mechanically interchangeable in standard PCB designs.

Q: How does the lower forward voltage drop of the MUR420 affect circuit performance?

A: The MUR420 exhibits lower forward voltage drop (890 mV @ 4A versus 950 mV @ 3A), resulting in reduced power dissipation during conduction. This represents an improvement in thermal performance and efficiency compared to the SF34G-AP.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both the SF34G-AP and MUR420 are ROHS3 compliant and REACH unaffected, satisfying equivalent environmental and regulatory requirements for industrial and commercial applications.

Q: What is the impact of the extended temperature range in the MUR420?

A: The MUR420 operates across -50°C to 175°C junction temperature, compared to -65°C to 150°C for the SF34G-AP. The MUR420 provides extended high-temperature capability, making it suitable for applications with elevated thermal environments.