STP20N20 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The STP20N20 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 200V drain-to-source voltage with 18A continuous drain current in a TO-220 through-hole package. This device is classified as Obsolete, which necessitates identification of equivalent and substitute components for ongoing production and maintenance applications. The part belongs to the STripFET™ II series and is ROHS3 compliant with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	200	V
Continuous Drain Current (Id) @ 25°C	18	A
Rds On (Max) @ 10A, 10V	125	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	39	nC
Power Dissipation (Max)	90	W
Operating Temperature Range	-50 to 150	°C
Package Type	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the STP20N20 is determined by matching the following critical electrical and mechanical parameters:

Primary Matching Criteria:

Drain-to-Source Voltage (Vdss): 200V minimum
Continuous Drain Current (Id): 18A minimum at 25°C
Package Type: TO-220 through-hole configuration
Gate Drive Voltage: 10V nominal

Secondary Compatibility Factors:

Gate Threshold Voltage (Vgs(th)): 4V nominal range
On-State Resistance (Rds On): 125mOhm or lower at specified conditions
Gate Charge (Qg): 39nC or lower preferred for switching performance
Operating Temperature Range: Minimum -50°C to 150°C

Substitute parts are grouped into two categories: Direct STMicroelectronics alternatives and cross-manufacturer equivalents from Infineon Technologies, Vishay Siliconix, and onsemi. All listed substitutes maintain the 200V/18A electrical specification and TO-220 package format, ensuring mechanical and electrical compatibility with existing circuit designs.

Parameter Comparison

Parameter	STP20N20	STP20NF20	IRF640NPBF	IRF640PBF	IRFB4020PBF	IRFB4620PBF	IRL640A
Manufacturer	STMicroelectronics	STMicroelectronics	Infineon	Vishay Siliconix	Infineon	Infineon	onsemi
Vdss (V)	200	200	200	200	200	200	200
Id @ 25°C (A)	18	18	18	18	18	25	18
Rds On (mOhm)	125 @ 10A, 10V	125 @ 10A, 10V	150 @ 11A, 10V	180 @ 11A, 10V	100 @ 11A, 10V	72.5 @ 15A, 10V	180 @ 9A, 5V
Vgs(th) (V)	4 @ 250µA	4 @ 250µA	4 @ 250µA	4 @ 250µA	4.9 @ 100µA	5 @ 100µA	2 @ 250µA
Qg (nC)	39 @ 10V	39 @ 10V	67 @ 10V	70 @ 10V	29 @ 10V	38 @ 10V	56 @ 5V
Power Dissipation (W)	90	110	150	125	100	144	110
Operating Temp Range (°C)	-50 to 150	-55 to 175	-55 to 175	-55 to 150	-55 to 175	-55 to 175	-55 to 150
Product Status	Obsolete	Active	Not For New Designs	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Affected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Preferred Primary Substitute: STP20NF20

The STP20NF20 is the direct STMicroelectronics successor to the STP20N20. It maintains identical electrical specifications (200V, 18A, 125mOhm Rds On) while offering improved power dissipation (110W versus 90W) and extended operating temperature range (-55°C to 175°C versus -50°C to 150°C). Product status is Active, ensuring long-term availability and supply chain stability. ROHS3 compliance and REACH Unaffected status align with the original part's regulatory requirements.

Secondary Substitute: IRFB4020PBF

The IRFB4020PBF from Infineon Technologies meets all primary electrical matching criteria with 200V/18A ratings and TO-220AB packaging. This part offers superior on-state resistance (100mOhm) and lower gate charge (29nC), resulting in improved switching efficiency. Product status is Active with extended temperature range (-55°C to 175°C). ROHS3 compliance and REACH Unaffected status are maintained. This substitute is suitable for applications requiring enhanced thermal performance.

Alternative Substitute: IRF640PBF

The IRF640PBF from Vishay Siliconix provides 200V/18A electrical compatibility with Active product status. Power dissipation rating of 125W exceeds the original specification. Note that REACH Status is listed as Affected, requiring verification of regulatory compliance for specific end-use applications. Operating temperature range extends to 175°C maximum.

Higher Current Alternative: IRFB4620PBF

The IRFB4620PBF offers 200V at 25A continuous drain current, providing current margin above the 18A requirement. Superior on-state resistance (72.5mOhm) and extended temperature range (-55°C to 175°C) support demanding thermal environments. Product status is Active with ROHS3 compliance and REACH Unaffected status. This substitute is applicable where increased current capacity provides design margin.

Not Recommended for New Designs: IRF640NPBF

The IRF640NPBF from Infineon meets electrical specifications but carries product status designation of Not For New Designs. While technically compatible, this part should not be selected for new circuit development due to lifecycle constraints.

Obsolete Alternative: IRL640A

The IRL640A from onsemi is classified as Obsolete, similar to the STP20N20. While electrically compatible, this part should not be considered for replacement applications due to supply availability concerns.

Frequently Asked Questions (FAQ)

Q: Can the STP20N20 be directly replaced with the STP20NF20?

A: Yes. The STP20NF20 is the direct successor from STMicroelectronics with identical electrical specifications (200V, 18A, 125mOhm Rds On) and TO-220-3 package. The STP20NF20 is Active status with improved power dissipation (110W) and extended temperature range (-55°C to 175°C). No circuit modifications are required.

Q: What is the difference between TO-220 and TO-220AB packaging?

A: Both designations refer to the same three-lead through-hole package format with identical pin configuration and mechanical dimensions. The suffix "AB" is a manufacturer-specific designation used by some suppliers. All listed substitutes are mechanically compatible with the original TO-220-3 package.

Q: Why do some substitute parts have higher gate charge (Qg) values?

A: Gate charge affects switching speed and driver circuit requirements. The STP20N20 specifies 39nC at 10V. Substitutes with higher gate charge (IRF640NPBF at 67nC, IRF640PBF at 70nC) require longer switching times but are electrically compatible. Lower gate charge substitutes (IRFB4020PBF at 29nC) provide faster switching performance. Gate driver circuits must be verified for compatibility with the selected part's gate charge specification.

Q: Is the IRFB4620PBF suitable as a substitute despite its 25A rating versus 18A?

A: Yes. The IRFB4620PBF is electrically compatible with 200V voltage rating and exceeds the 18A current requirement. Higher current rating provides design margin without creating incompatibility. The part maintains TO-220AB package compatibility and Active product status. On-state resistance is superior (72.5mOhm), improving thermal performance.

Q: What is the significance of REACH Affected status for IRF640PBF?

A: REACH Affected status indicates the part may contain substances of concern under European chemical regulations. Verification of regulatory compliance is required for applications subject to REACH requirements. Alternative substitutes with REACH Unaffected status (STP20NF20, IRFB4020PBF, IRFB4620PBF) are available if REACH compliance is mandatory.

Q: Can the IRL640A be used as a replacement?

A: The IRL640A is electrically compatible with 200V/18A specifications and TO-220-3 packaging. However, it is classified as Obsolete, creating supply chain risk. The IRL640A should not be selected for new applications or long-term production requirements. Active status alternatives are strongly preferred.

Q: Why is IRF640NPBF listed as Not For New Designs?

A: Product status of Not For New Designs indicates the manufacturer has discontinued active development and support for this part. While technically compatible, this designation signals end-of-life trajectory. New circuit designs should utilize Active status alternatives such as STP20NF20, IRFB4020PBF, or IRF640PBF to ensure long-term supply availability and manufacturer support.

Q: What are the thermal implications of selecting IRFB4020PBF over STP20NF20?

A: The IRFB4020PBF offers lower on-state resistance (100mOhm versus 125mOhm), resulting in reduced conduction losses and improved thermal performance. Power dissipation rating is 100W versus 110W for STP20NF20. In applications with thermal constraints, the IRFB4020PBF provides efficiency advantage. Both parts maintain identical voltage and current ratings.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status, matching the original STP20N20 regulatory requirement. This ensures compatibility with RoHS-restricted applications and procurement specifications.

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