FDPF12N35 Equivalent & Substitute Parts

Part Overview

The FDPF12N35 is an N-Channel MOSFET manufactured by onsemi, rated for 350V drain-to-source voltage and 12A continuous drain current in a Through Hole TO-220F-3 package. This device is part of the UniFET™ series and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and system maintenance where the FDPF12N35 is no longer available from primary sources.

Substiute Parts

FDPF12N35

onsemiIn Stock: 15297FDPF12N35 Datasheet

Current PartRFQ

IRF740APBF

Vishay SiliconixIn Stock: 7479IRF740APBF Datasheet

SimilarRFQ

RCX100N25

Rohm SemiconductorIn Stock: 1623RCX100N25 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDPF12N35 is determined by the following critical parameters:

Primary Substitution Criteria:

• FET Type: N-Channel MOSFET technology
• Drain to Source Voltage (Vdss): Minimum 350V required for direct substitution
• Continuous Drain Current (Id): Minimum 12A at 25°C required
• Drive Voltage: 10V gate drive compatibility
• Mounting Type: Through Hole configuration
• Package Family: TO-220 series (TO-220-3, TO-220AB, TO-220FM variants acceptable)
• Operating Temperature Range: -55°C to 150°C minimum

Substitution Logic: Parts are grouped as substitutes when they meet or exceed the voltage and current ratings of the FDPF12N35 while maintaining compatible gate drive characteristics and thermal operating range. Rds On values, gate charge, and input capacitance are secondary parameters that influence performance but do not disqualify substitution when primary criteria are satisfied.

Parameter Comparison

Engineering Selection Recommendations

IRF740APBF (Vishay Siliconix): The IRF740APBF is an active product with higher voltage rating (400V) and superior power dissipation capability (125W). This part exceeds the FDPF12N35 voltage specification and provides enhanced thermal performance. The IRF740APBF is RoHS3 compliant and REACH affected, making it suitable for applications requiring current regulatory compliance. The continuous drain current of 10A is 2A lower than the FDPF12N35, which may require circuit evaluation in high-current applications. This substitute is appropriate for new designs and production environments where regulatory compliance is mandatory.

RCX100N25 (Rohm Semiconductor): The RCX100N25 is an active product with lower voltage rating (250V) and reduced power dissipation (40W). This part does not meet the 350V voltage requirement of the FDPF12N35 and is not suitable as a direct substitute for applications requiring the full 350V rating. The RCX100N25 is RoHS3 compliant and REACH unaffected. This part is applicable only in applications where the circuit voltage is limited to 250V or lower.

Product Status Consideration: The FDPF12N35 is obsolete. Both substitute parts (IRF740APBF and RCX100N25) are active products with ongoing manufacturing and supply availability. Selection between substitutes depends on voltage requirement compatibility and regulatory compliance needs of the target application.

Frequently Asked Questions (FAQ)

Q: Can the IRF740APBF directly replace the FDPF12N35 in all applications?

A: The IRF740APBF meets the primary substitution criteria of voltage (400V exceeds 350V requirement) and gate drive compatibility (10V). However, the continuous drain current is 10A versus 12A for the FDPF12N35. Applications operating at or near 12A continuous current require thermal and circuit analysis to confirm the IRF740APBF can sustain the required current within acceptable junction temperature limits.

Q: Why is the RCX100N25 listed as a substitute if it has lower voltage rating?

A: The RCX100N25 is listed based on the input parameters provided. However, its 250V rating does not satisfy the 350V requirement of the FDPF12N35. The RCX100N25 is suitable only for applications where the actual circuit voltage is 250V or lower, not as a general replacement for the FDPF12N35.

Q: Are the TO-220F-3, TO-220AB, and TO-220FM packages mechanically interchangeable?

A: All three packages are TO-220 family variants with three leads and compatible pin configurations for Through Hole mounting. Mechanical fit and PCB layout compatibility are equivalent. Thermal performance may vary slightly due to package construction differences, but all are suitable for standard TO-220 footprints.

Q: What is the significance of the Rds On difference between FDPF12N35 and IRF740APBF?

A: The FDPF12N35 has Rds On of 380 mOhm at 6A, 10V, while the IRF740APBF has 550 mOhm at the same conditions. Higher Rds On results in greater conduction losses and heat generation. In applications with high switching frequency or continuous high current, this difference affects power dissipation and thermal management requirements.

Q: Is the FDPF12N35 available from current inventory?

A: The FDPF12N35 is classified as obsolete. While 15,226 pieces are listed as in stock, this represents legacy inventory. For new production and long-term supply assurance, selection of active substitute parts (IRF740APBF or RCX100N25, depending on voltage requirements) is recommended.

Q: What compliance certifications should I consider when selecting a substitute?

A: The IRF740APBF is RoHS3 compliant and REACH affected, suitable for applications subject to EU environmental regulations. The RCX100N25 is RoHS3 compliant and REACH unaffected. Both parts have MSL 1 (Unlimited) moisture sensitivity. Selection depends on the regulatory environment of the target application and end-use market.