STP20NM50FP N-Channel MOSFET 550V 20A TO-220FP Equivalent & Substitute Parts

Part Overview

The STP20NM50FP is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 550V drain-to-source voltage and 20A continuous drain current in a Through Hole TO-220FP package. This device is part of the MDmesh™ series and is classified as Obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, on-resistance, and thermal characteristics while accommodating the Through Hole TO-220 package family.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	550	V
Continuous Drain Current (Id) @ 25°C	20	A
On-Resistance (Rds On) @ 10A, 10V	250	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	5	V
Gate Charge (Qg) @ 10V	56	nC
Power Dissipation (Max)	45	W
Operating Temperature Range	-65 to 150	°C
Package Type	TO-220-3 Full Pack	Through Hole
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the STP20NM50FP is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

FET Type: N-Channel MOSFET (Metal Oxide Semiconductor)
Drain-to-Source Voltage (Vdss): Minimum 550V (equal or higher rating acceptable)
Continuous Drain Current (Id): 20A at 25°C (equal or higher rating acceptable)
On-Resistance (Rds On): Maximum 250mOhm @ 10A, 10V (lower or equal acceptable)
Gate Threshold Voltage (Vgs(th)): 5V @ 250µA (within acceptable range)
Mounting Type: Through Hole
Package Family: TO-220 (TO-220FP, TO-220F, TO-220SIS variants acceptable)
Compliance: ROHS3 Compliant, REACH Unaffected

Acceptable Substitution Logic: Parts with equal or higher voltage ratings, equal or higher current ratings, and equal or lower on-resistance values are electrically compatible. Variations in gate charge, input capacitance, and power dissipation within the TO-220 package family do not preclude substitution when primary parameters are met. Package variants within the TO-220 family (TO-220FP, TO-220F, TO-220SIS) are mechanically compatible for Through Hole mounting applications.

Parameter Comparison

Parameter	STP20NM50FP	STP20NM60FP	AOTF20N40L	FDPF20N50FT	FDPF20N50T	TK16A45D(STA4,Q,M)
Manufacturer	STMicroelectronics	STMicroelectronics	Alpha & Omega Semiconductor Inc.	onsemi	onsemi	Toshiba Semiconductor and Storage
Vdss (V)	550	600	400	500	500	450
Id @ 25°C (A)	20	20	20	20	20	16
Rds On @ 10A, 10V (mOhm)	250	290	250	260	230	270
Vgs(th) @ 250µA (V)	5	5	4.3	5	5	—
Gate Charge @ 10V (nC)	56	54	45	65	59.5	—
Power Dissipation (W)	45	45	40	38.5	38.5	—
Operating Temperature (°C)	-65 to 150	-65 to 150	-55 to 150	-55 to 150	-55 to 150	—
Package	TO-220FP	TO-220FP	TO-220F	TO-220F-3	TO-220F-3	TO-220SIS
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

Primary Substitute: STP20NM60FP

The STP20NM60FP is the recommended primary substitute. It is manufactured by STMicroelectronics, the same manufacturer as the original part, and maintains the MDmesh™ series lineage. This part exceeds the voltage rating (600V vs. 550V), maintains the 20A current rating, and preserves the 45W power dissipation specification. The part is Active in product status, ensuring long-term availability. ROHS3 compliance and REACH Unaffected status match the original part. The TO-220FP package is identical to the original.

Secondary Substitutes: FDPF20N50T and FDPF20N50FT

Both onsemi UniFET™ parts meet the electrical requirements with 500V Vdss and 20A Id ratings. FDPF20N50T offers superior on-resistance performance (230mOhm vs. 250mOhm), providing improved thermal efficiency. Both parts are Active in product status with ROHS3 compliance. The TO-220F-3 package is mechanically compatible with Through Hole mounting. Higher inventory availability (20,360 Pcs for FDPF20N50FT) supports production continuity.

Tertiary Substitute: AOTF20N40L

The AOTF20N40L from Alpha & Omega Semiconductor Inc. is suitable for applications where the 550V voltage rating is not critical. This part operates at 400V Vdss, which is below the original specification. It maintains the 20A current rating and 250mOhm on-resistance. This part is Active in product status with ROHS3 compliance. Use is restricted to circuits operating below 400V.

Not Recommended: TK16A45D(STA4,Q,M)

The Toshiba part TK16A45D(STA4,Q,M) has a reduced current rating of 16A, which does not meet the 20A specification of the original part. While the 450V voltage rating is acceptable, the current limitation makes this part unsuitable as a direct substitute.

Frequently Asked Questions (FAQ)

Q: Can the STP20NM60FP directly replace the STP20NM50FP in all applications?

A: Yes. The STP20NM60FP exceeds the voltage rating (600V vs. 550V) and maintains all other critical parameters including 20A current, 45W power dissipation, and identical TO-220FP packaging. Higher voltage ratings are backward compatible with lower voltage circuit designs.

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

A: Both are Through Hole TO-220 variants with three leads (Gate, Drain, Source). The TO-220FP and TO-220F packages are mechanically compatible for PCB mounting. Pin configuration and thermal characteristics remain consistent across these variants.

Q: Are the onsemi FDPF20N50T and FDPF20N50FT parts interchangeable?

A: Both parts are electrically compatible with identical voltage and current ratings. FDPF20N50T offers lower on-resistance (230mOhm vs. 260mOhm), resulting in reduced power dissipation. Selection depends on thermal performance requirements. Both are packaged in TO-220F-3 and are mechanically interchangeable.

Q: Why is the AOTF20N40L not recommended as a primary substitute?

A: The AOTF20N40L operates at 400V Vdss, which is below the original 550V specification. While it maintains the 20A current rating and 250mOhm on-resistance, it is only suitable for applications operating below 400V. Use is restricted to circuits with lower voltage requirements.

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

A: All recommended substitutes maintain ROHS3 compliance and REACH Unaffected status, matching the original part. Verify that the selected substitute meets your application's specific regulatory requirements before implementation.

Q: Does the higher gate charge of FDPF20N50FT (65nC vs. 56nC) affect circuit performance?

A: Gate charge differences affect gate drive circuit design and switching speed characteristics. Higher gate charge requires slightly more drive current from the gate driver. This does not preclude substitution but may require gate driver circuit evaluation for optimal performance in high-frequency switching applications.

Q: Is the reduced operating temperature range of AOTF20N40L (-55°C vs. -65°C minimum) a concern?

A: The AOTF20N40L minimum operating temperature of -55°C is acceptable for most industrial and commercial applications. If your design requires operation below -55°C, select STP20NM60FP or the onsemi parts, which operate to -55°C minimum.

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