FDPF7N50U N-Channel 500V 5A MOSFET Equivalent & Substitute Parts

Part Overview

The FDPF7N50U is an N-Channel MOSFET manufactured by onsemi, rated for 500V drain-to-source voltage and 5A continuous drain current in a Through Hole TO-220F-3 package. This device is part of the UniFET™ series and is currently classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for ongoing design support, production continuity, and new system implementations. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, on-resistance characteristics, and thermal performance while accommodating package variations.

Substiute Parts

FDPF7N50U

onsemiIn Stock: 6265FDPF7N50U Datasheet

Current PartRFQ

TK4A53D(STA4,Q,M)

Toshiba Semiconductor and StorageIn Stock: 737TK4A53D(STA4,Q,M) Datasheet

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TK5A50D(STA4,Q,M)

Toshiba Semiconductor and StorageIn Stock: 12351TK5A50D(STA4,Q,M) Datasheet

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TK5A55D(STA4,Q,M)

Toshiba Semiconductor and StorageIn Stock: 1100TK5A55D(STA4,Q,M) Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDPF7N50U is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Drain-to-Source Voltage (Vdss): Must equal or exceed 500V
• Continuous Drain Current (Id): Must equal or exceed 5A at rated temperature
• On-Resistance (Rds On): Must not exceed 1.5Ω at specified gate and drain current conditions
• Gate Threshold Voltage (Vgs(th)): Must be compatible with 10V drive voltage applications
• Package Type: Through Hole TO-220 family packages (TO-220F-3, TO-220SIS)
• FET Type: N-Channel MOSFET technology
• Operating Temperature: Must support -55°C to 150°C range or equivalent

Substitute Parts Identified:

The following Toshiba Semiconductor parts meet the substitution criteria for the FDPF7N50U:

1. TK5A50D(STA4,Q,M) – Direct electrical equivalent with matching Vdss (500V) and Id (5A) ratings
2. TK5A55D(STA4,Q,M) – Higher voltage rated variant (550V) suitable for applications with voltage margin requirements
3. TK4A53D(STA4,Q,M) – Lower current variant (4A) for applications with reduced current requirements

All substitute parts are manufactured by Toshiba Semiconductor and Storage, feature active product status, and are available in Through Hole TO-220SIS packages compatible with TO-220-3 footprints.

Parameter Comparison

Engineering Selection Recommendations

TK5A50D(STA4,Q,M) – Primary Substitute

The TK5A50D(STA4,Q,M) is the direct electrical equivalent for the FDPF7N50U. It provides identical Vdss (500V) and Id (5A) ratings with matching on-resistance characteristics (1.5Ω @ 2.5A, 10V). This part is manufactured by Toshiba Semiconductor and Storage with active product status and ROHS3 compliance. The TO-220SIS package is mechanically compatible with TO-220-3 footprints. Inventory availability is 12,300 units. This substitute is suitable for direct replacement in existing designs without circuit modification.

TK5A55D(STA4,Q,M) – Higher Voltage Margin Variant

The TK5A55D(STA4,Q,M) offers increased voltage rating (550V) while maintaining 5A current capacity. This part is appropriate for applications requiring additional voltage margin or operating in environments with voltage transients. On-resistance increases slightly to 1.7Ω at 2.5A, 10V. Product status is active with ROHS3 compliance. Inventory availability is 1,048 units. This substitute accommodates designs with higher voltage stress requirements.

TK4A53D(STA4,Q,M) – Lower Current Variant

The TK4A53D(STA4,Q,M) is rated for 4A continuous drain current at 525V. This part is suitable for applications where the full 5A capacity of the FDPF7N50U is not required. On-resistance is 1.7Ω at 2A, 10V. Product status is active with RoHS compliance. Inventory availability is 633 units. This substitute is appropriate for current-limited applications or where thermal management is less demanding.

All substitute parts maintain operating temperature range compatibility (-55°C to 150°C) and feature MSL 1 (Unlimited) moisture sensitivity ratings. Package variations (TO-220SIS versus TO-220F-3) are mechanically compatible within standard TO-220 footprints.

Frequently Asked Questions (FAQ)

Q: Can TK5A50D(STA4,Q,M) be used as a direct replacement for FDPF7N50U without circuit modifications?

A: Yes. The TK5A50D(STA4,Q,M) provides identical electrical ratings for Vdss (500V), Id (5A), and Rds On (1.5Ω @ 2.5A, 10V). The TO-220SIS package is mechanically compatible with TO-220-3 footprints. No circuit modifications are required.

Q: What is the difference between TK5A50D and TK5A55D?

A: The primary difference is the Vdss rating: TK5A50D is rated for 500V, while TK5A55D is rated for 550V. Both maintain 5A continuous drain current. The TK5A55D has slightly higher on-resistance (1.7Ω versus 1.5Ω at 2.5A, 10V) and higher input capacitance (540 pF versus 490 pF). Select TK5A55D for applications requiring higher voltage margin.

Q: Is TK4A53D suitable for applications designed for the FDPF7N50U?

A: TK4A53D is suitable only for applications where the continuous drain current requirement does not exceed 4A. The part provides 525V Vdss rating and is compatible with 10V gate drive voltage. If the application requires the full 5A capacity, use TK5A50D or TK5A55D instead.

Q: Are all substitute parts RoHS compliant?

A: Yes. TK5A50D(STA4,Q,M) and TK5A55D(STA4,Q,M) are ROHS3 compliant. TK4A53D(STA4,Q,M) is RoHS compliant. All parts meet environmental regulatory requirements.

Q: What is the difference between TO-220F-3 and TO-220SIS packages?

A: Both are Through Hole TO-220 family packages with three leads (Gate, Drain, Source). TO-220SIS is a variant designation used by Toshiba. The packages are mechanically compatible and share the same footprint for PCB mounting. Pin assignments and thermal characteristics are equivalent.

Q: How do gate charge differences affect circuit performance?

A: The FDPF7N50U has gate charge of 16.6 nC at 10V, while all Toshiba substitutes have 11 nC at 10V. Lower gate charge results in faster switching transitions and reduced gate drive power requirements. This difference is beneficial for high-frequency switching applications and reduces driver circuit stress.

Q: Can these parts be used in applications with operating temperatures below -55°C or above 150°C?

A: No. All parts, including the FDPF7N50U and its substitutes, are rated for -55°C to 150°C operating temperature range. Applications requiring operation outside this range require alternative device selection.

Q: What inventory considerations should be made when selecting a substitute?

A: TK5A50D(STA4,Q,M) has the highest inventory availability at 12,300 units, making it the most readily available substitute. TK5A55D(STA4,Q,M) has 1,048 units available, and TK4A53D(STA4,Q,M) has 633 units. For high-volume production, TK5A50D is recommended based on supply availability.