FDPF20N50 N-Channel 500V 20A MOSFET Equivalent & Substitute Parts

Part Overview

The FDPF20N50 is an N-Channel MOSFET manufactured by onsemi in the UniFET™ series, rated for 500V drain-to-source voltage and 20A continuous drain current. The device is packaged in a Through Hole TO-220F-3 configuration and is currently listed as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and system maintenance. Substitute parts must maintain electrical compatibility within the specified voltage, current, and thermal operating parameters while accommodating available packaging options.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	500	V
Current - Continuous Drain (Id) @ 25°C	20	A (Tc)
Drive Voltage (Max Rds On)	10	V
Rds On (Max) @ Id, Vgs	230	mOhm @ 10A, 10V
Vgs(th) (Max) @ Id	5	V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	59.5	nC @ 10V
Vgs (Max)	±30	V
Input Capacitance (Ciss) (Max) @ Vds	3120	pF @ 25V
Power Dissipation (Max)	38.5	W (Tc)
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-220-3 Full Pack	—
Technology	MOSFET (Metal Oxide)	—

Substitute Part Grouping Explanation

Substitution of the FDPF20N50 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain to Source Voltage (Vdss): 500V minimum
Continuous Drain Current (Id): 20A or greater at 25°C
Gate Drive Voltage: 10V nominal
On-State Resistance (Rds On): 230mOhm or lower at specified conditions
Mounting Type: Through Hole
Package Type: TO-220 series compatible

Secondary Compatibility Factors:

Gate Threshold Voltage (Vgs(th)): 3.5V to 5V range
Maximum Gate Voltage (Vgs): ±20V or ±30V
Operating Temperature Range: -55°C to 150°C minimum
RoHS3 Compliance and REACH Unaffected status

Substitute parts are classified into two categories:

Parametric Equivalent: Parts with identical or superior electrical specifications and active product status, enabling direct replacement with no design modifications.

Similar Parts: Parts with comparable voltage and current ratings but with variations in on-state resistance, gate charge, or current capacity. These require application-level verification to confirm suitability for the intended circuit function.

Parameter Comparison

Parameter	FDPF20N50	FDPF20N50T	IXTP460P2	IPP50R250CPXKSA1	IPP50R280CEXKSA1	TK19A45D(STA4,Q,M)	IRFI3205PBF
Manufacturer	onsemi	onsemi	IXYS	Infineon	Infineon	Toshiba	Infineon
Vdss (V)	500	500	500	500	500	450	55
Id @ 25°C (A)	20	20	24	13	13	19	64
Rds On (Max) (mOhm)	230 @ 10A, 10V	230 @ 10A, 10V	270 @ 12A, 10V	250 @ 7.8A, 10V	280 @ 4.2A, 13V	250 @ 9.5A, 10V	8 @ 34A, 10V
Vgs(th) (Max) (V)	5 @ 250µA	5 @ 250µA	4.5 @ 250µA	3.5 @ 520µA	3.5 @ 350µA	4 @ 1mA	4 @ 250µA
Qg (Max) (nC)	59.5 @ 10V	59.5 @ 10V	48 @ 10V	36 @ 10V	32.6 @ 10V	45 @ 10V	170 @ 10V
Vgs (Max) (V)	±30	±30	±30	±20	±20	±30	±20
Ciss (Max) (pF)	3120 @ 25V	3120 @ 25V	2890 @ 25V	1420 @ 100V	773 @ 100V	2600 @ 25V	4000 @ 25V
Pd (Max) (W)	38.5	38.5	480	114	92	50	63
Operating Temp (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	to 150	-55 to 175
Package	TO-220F-3	TO-220F-3	TO-220-3	PG-TO220-3-1	PG-TO220-3-1	TO-220SIS	TO-220AB Full-Pak
Product Status	Obsolete	Active	Last Time Buy	Active	Active	Active	Active
RoHS3 Compliant	Yes	Yes	Yes	Yes	Yes	Yes	Yes

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

The FDPF20N50T is the primary equivalent for the obsolete FDPF20N50. Both parts share identical electrical specifications including 500V Vdss, 20A continuous drain current, 230mOhm Rds On, and 38.5W power dissipation. The FDPF20N50T is manufactured by onsemi in the same UniFET™ series and maintains active product status. The only difference is packaging format (Tube versus standard), which does not affect electrical performance. This part is suitable for direct substitution in all applications.

Similar Parts (Application-Dependent Selection):

IXTP460P2 (IXYS): Rated for 500V Vdss and 24A continuous drain current, exceeding the 20A requirement. On-state resistance is 270mOhm at 12A, slightly higher than the 230mOhm specification. Gate charge is lower at 48nC, improving switching speed. Power dissipation capability is significantly higher at 480W. This part is suitable for applications where higher current capacity and improved thermal performance are beneficial. Product status is Last Time Buy, indicating limited future availability.

IPP50R250CPXKSA1 (Infineon CoolMOS™): Rated for 500V Vdss but with reduced continuous drain current of 13A, below the 20A requirement. On-state resistance is 250mOhm at 7.8A. Gate charge is lower at 36nC. This part is not suitable for applications requiring the full 20A continuous current capacity.

IPP50R280CEXKSA1 (Infineon CoolMOS™): Rated for 500V Vdss with 13A continuous drain current, below the 20A requirement. On-state resistance is 280mOhm at 4.2A. This part is not suitable for applications requiring the full 20A continuous current capacity.

TK19A45D(STA4,Q,M) (Toshiba π-MOSVII): Rated for 450V Vdss and 19A continuous drain current. Vdss is 50V lower than the 500V specification, limiting applicability to circuits with maximum operating voltages below 450V. On-state resistance is 250mOhm at 9.5A. This part is suitable only for applications with reduced voltage requirements.

IRFI3205PBF (Infineon HEXFET®): Rated for 55V Vdss, significantly lower than the 500V requirement. This part is not suitable for high-voltage applications and represents a different device class.

Compliance and Availability:

All substitute parts listed maintain RoHS3 compliance and REACH Unaffected status, consistent with the original FDPF20N50. The FDPF20N50T and active-status Infineon parts offer the best long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the FDPF20N50T be used as a direct replacement for the FDPF20N50?

A: Yes. The FDPF20N50T is a parametric equivalent with identical electrical specifications. Both parts are N-Channel MOSFETs rated for 500V Vdss, 20A continuous drain current, and 230mOhm on-state resistance. The FDPF20N50T is manufactured by onsemi and maintains active product status, making it the recommended replacement for the obsolete FDPF20N50.

Q: Why is the IXTP460P2 listed as a substitute if it has higher on-state resistance?

A: The IXTP460P2 meets the primary voltage and current requirements (500V Vdss, 24A continuous drain current) and exceeds the 20A specification. The on-state resistance of 270mOhm is slightly higher than 230mOhm but remains within acceptable tolerance for many applications. The significantly higher power dissipation capability (480W versus 38.5W) makes this part suitable for circuits with higher thermal demands. Application-level verification is required to confirm suitability.

Q: Can the Infineon IPP50R250CPXKSA1 replace the FDPF20N50?

A: No. While the IPP50R250CPXKSA1 matches the 500V Vdss rating, its continuous drain current is limited to 13A, which is below the 20A requirement of the FDPF20N50. This part is not suitable for applications requiring the full 20A continuous current capacity.

Q: What is the significance of the different package types (TO-220F-3 versus TO-220-3)?

A: Both TO-220F-3 and TO-220-3 are Through Hole packages with identical pin configurations and electrical performance. The primary difference is mechanical form factor and mounting footprint. TO-220F-3 is a full-pack variant, while TO-220-3 is the standard configuration. Both are compatible with standard TO-220 mounting hardware and PCB layouts. Verify mechanical clearance and thermal management requirements for your specific application.

Q: Why is the TK19A45D(STA4,Q,M) not recommended as a primary substitute?

A: The TK19A45D(STA4,Q,M) is rated for 450V Vdss, which is 50V lower than the 500V specification of the FDPF20N50. This voltage limitation restricts its use to circuits with maximum operating voltages below 450V. Additionally, the continuous drain current is 19A, slightly below the 20A requirement. This part is suitable only for applications with reduced voltage and current requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain RoHS3 compliance and REACH Unaffected status, consistent with the original FDPF20N50. This ensures environmental and regulatory compatibility across all listed alternatives.

Q: What should I consider when selecting between the FDPF20N50T and IXTP460P2?

A: The FDPF20N50T is the preferred choice for direct replacement due to identical specifications and active product status. The IXTP460P2 is suitable if your application benefits from higher current capacity (24A versus 20A) and significantly higher power dissipation capability (480W versus 38.5W). However, the IXTP460P2 has Last Time Buy status, indicating limited future availability. For new designs, the FDPF20N50T is recommended.

Q: Can I use the IRFI3205PBF as a substitute?

A: No. The IRFI3205PBF is rated for only 55V Vdss, which is far below the 500V requirement of the FDPF20N50. This part operates in a different voltage class and is not suitable for high-voltage applications. It represents a fundamentally different device category.

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