FDP20N50 Equivalent & Substitute Parts

Part Overview

The FDP20N50 is an N-Channel 500V 20A MOSFET manufactured by onsemi in the UniFET™ series, housed in a TO-220-3 through-hole package. This device is rated for 250W power dissipation and operates across a temperature range of -55°C to 150°C. The part is classified as Obsolete, making identification of equivalent and substitute components necessary for ongoing system support, redesigns, and procurement continuity. Substitute parts must maintain electrical compatibility across drain-source voltage, continuous drain current, on-resistance characteristics, and thermal performance parameters while accommodating the through-hole TO-220-3 package format.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	500	V
Continuous Drain Current (Id) @ 25°C	20	A
On-Resistance (Rds On) @ 10A, 10V	230	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	5	V
Gate Charge (Qg) @ 10V	59.5	nC
Power Dissipation (Max)	250	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-220-3	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the FDP20N50 is determined by the following critical parameters:

Voltage Rating (Vdss): Substitute parts must equal or exceed 500V to maintain system voltage margin and reliability. Parts rated below 500V are not suitable.

Continuous Drain Current (Id): Substitute parts must support a minimum of 20A continuous drain current at 25°C to handle the design load without thermal derating.

On-Resistance (Rds On): The on-resistance at rated conditions directly affects power dissipation and thermal performance. Substitute parts with significantly higher Rds On values will increase heat generation and may exceed thermal budgets.

Package and Mounting: All substitutes must use the TO-220-3 through-hole package to ensure mechanical and thermal compatibility with existing PCB layouts and heatsink interfaces.

Electrical Characteristics: Gate threshold voltage, gate charge, and input capacitance must fall within acceptable ranges to ensure proper gate drive circuit operation and switching performance.

Compliance: All substitute parts must maintain ROHS3 compliance and REACH unaffected status to satisfy regulatory and supply chain requirements.

Parameter Comparison

Parameter	FDP20N50	FCP165N65S3	FCP20N60	IPP50R250CPXKSA1	IPP50R280CEXKSA1	IXTP460P2	STP19NM50N	STP20NK50Z	STP23NM50N
Manufacturer	onsemi	onsemi	onsemi	Infineon	Infineon	IXYS	STMicroelectronics	STMicroelectronics	STMicroelectronics
Vdss (V)	500	650	600	500	500	500	500	500	500
Id @ 25°C (A)	20	19	20	13	13	24	14	17	17
Rds On (mOhm)	230 @ 10A	165 @ 9.5A	190 @ 10A	250 @ 7.8A	280 @ 4.2A	270 @ 12A	250 @ 7A	270 @ 8.5A	190 @ 8.5A
Vgs(th) (V)	5 @ 250µA	4.5 @ 1.9mA	5 @ 250µA	3.5 @ 520µA	3.5 @ 350µA	4.5 @ 250µA	4 @ 250µA	4.5 @ 100µA	4 @ 250µA
Qg @ 10V (nC)	59.5	39	98	36	32.6	48	34	119	45
Power Dissipation (W)	250	154	208	114	92	480	110	190	125
Package	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Not For New Designs	Not For New Designs	Active	Active	Last Time Buy	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

STP20NK50Z (STMicroelectronics) and STP23NM50N (STMicroelectronics) are the most suitable direct substitutes. Both maintain the 500V voltage rating, support continuous drain currents of 17A and 17A respectively, and are housed in TO-220-3 packages. STP20NK50Z offers 190W power dissipation with 270mOhm on-resistance, while STP23NM50N provides 125W dissipation with 190mOhm on-resistance. Both parts carry Active product status and full ROHS3 compliance, ensuring long-term availability and regulatory conformance.

Secondary Substitutes (Acceptable with Design Verification):

FCP20N60 (onsemi) maintains the 20A continuous drain current rating and TO-220-3 package but operates at 600V, providing additional voltage margin. On-resistance of 190mOhm at 10A is comparable to the FDP20N50. However, this part carries Not For New Designs status, limiting its suitability for new applications.

IXTP460P2 (IXYS) exceeds the FDP20N50 specifications with 24A continuous drain current and 480W power dissipation at 500V. This part is suitable for applications requiring higher current capacity but carries Last Time Buy status, indicating limited future availability.

Limited Substitutes (Current Derating Required):

STP19NM50N (STMicroelectronics) and IPP50R250CPXKSA1 (Infineon) both support 500V operation but are rated for 14A and 13A continuous drain current respectively, below the FDP20N50 specification of 20A. These parts are suitable only for applications where the actual operating current is below 14A. Both maintain Active product status and full compliance.

Not Recommended:

IPP50R280CEXKSA1 (Infineon) is rated for only 13A continuous drain current and exhibits 280mOhm on-resistance at 4.2A, both significantly below FDP20N50 specifications. This part is unsuitable for direct substitution.

FCP165N65S3 (onsemi) is rated for 19A continuous drain current at 650V, approaching but not meeting the 20A specification. This part carries Not For New Designs status and is not recommended for new applications.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a higher voltage rating than the FDP20N50?

A: Yes. Substitute parts with voltage ratings equal to or greater than 500V are electrically compatible. Higher voltage ratings provide additional design margin and do not compromise circuit operation. Parts such as FCP165N65S3 (650V) and FCP20N60 (600V) are acceptable from a voltage perspective.

Q: What is the minimum continuous drain current rating required for a substitute?

A: The substitute part must support at least 20A continuous drain current at 25°C to handle the design load without thermal derating. Parts rated below 20A, such as STP19NM50N (14A) and IPP50R250CPXKSA1 (13A), are suitable only if the actual circuit operating current is confirmed to be below their rated values.

Q: How does on-resistance affect substitute selection?

A: On-resistance directly determines power dissipation and thermal performance. The FDP20N50 exhibits 230mOhm on-resistance at 10A and 10V. Substitute parts with significantly higher on-resistance values will generate more heat. For example, IPP50R280CEXKSA1 at 280mOhm and IPP50R250CPXKSA1 at 250mOhm will increase thermal load. Conversely, STP23NM50N at 190mOhm and FCP165N65S3 at 165mOhm offer improved thermal performance.

Q: Are all substitute parts available in the same TO-220-3 package?

A: Yes. All substitute parts listed in this reference are housed in TO-220-3 through-hole packages, ensuring mechanical and thermal compatibility with existing PCB layouts and heatsink interfaces. Package compatibility eliminates the need for PCB redesign.

Q: What is the significance of product status when selecting a substitute?

A: Product status indicates supply chain availability and manufacturer support. Active status parts such as STP20NK50Z, STP23NM50N, STP19NM50N, IPP50R250CPXKSA1, and IPP50R280CEXKSA1 offer long-term availability and ongoing manufacturer support. Not For New Designs parts such as FCP20N60 and FCP165N65S3 have limited future availability. Last Time Buy parts such as IXTP460P2 indicate imminent discontinuation.

Q: Do all substitute parts meet RoHS3 and REACH compliance?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for electronic component procurement and environmental compliance.

Q: Can I use STP20NK50Z as a direct replacement for FDP20N50?

A: Yes. STP20NK50Z is a suitable direct substitute. It maintains 500V voltage rating, supports 17A continuous drain current (below the FDP20N50 specification of 20A but acceptable for most applications), exhibits 270mOhm on-resistance, and is housed in TO-220-3 package. The part carries Active product status and full ROHS3 compliance.

Q: What is the difference between STP20NK50Z and STP23NM50N?

A: Both parts operate at 500V and are housed in TO-220-3 packages. STP20NK50Z supports 17A continuous drain current with 270mOhm on-resistance and 190W power dissipation. STP23NM50N supports 17A continuous drain current with 190mOhm on-resistance and 125W power dissipation. STP23NM50N offers lower on-resistance and reduced thermal dissipation, making it preferable for applications sensitive to heat generation.

Q: Why is IXTP460P2 listed as a substitute if it has higher current rating?

A: IXTP460P2 exceeds FDP20N50 specifications with 24A continuous drain current and 480W power dissipation at 500V, making it suitable for applications requiring higher current capacity. However, this part carries Last Time Buy status, indicating limited future availability. It is listed as an acceptable substitute for applications where higher current capability is beneficial and supply chain risk is acceptable.

Q: Are gate charge differences significant when selecting a substitute?

A: Gate charge affects gate drive circuit design and switching speed. The FDP20N50 exhibits 59.5nC gate charge at 10V. Substitute parts with lower gate charge, such as IPP50R280CEXKSA1 (32.6nC) and IPP50R250CPXKSA1 (36nC), require less gate drive energy and may improve switching efficiency. Parts with higher gate charge, such as FCP20N60 (98nC) and STP20NK50Z (119nC), require more robust gate drive circuits but are not incompatible.

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