STP14NF12 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The STP14NF12 is an N-Channel MOSFET manufactured by STMicroelectronics, rated for 120V drain-to-source voltage and 14A continuous drain current in a TO-220-3 through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across a wide temperature range from -55°C to 175°C and complies with RoHS3 and REACH standards.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	120	V
Continuous Drain Current (Id) @ 25°C	14	A (Tc)
On-State Resistance (Rds On) @ 7A, 10V	180	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	21	nC
Power Dissipation (Max)	60	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-220-3	Through Hole
FET Type	N-Channel	—
Technology	MOSFET (Metal Oxide)	—

Substitute Part Grouping Explanation

Substitute parts for the STP14NF12 are classified based on compatibility with the following critical parameters:

Primary Substitution Criteria:

FET Type: N-Channel
Technology: MOSFET (Metal Oxide)
Package Type: TO-220-3 or TO-220-compatible through-hole
Drain-to-Source Voltage (Vdss): Equal to or greater than 120V
Continuous Drain Current (Id): Equal to or greater than 14A
Gate Drive Voltage: 10V nominal
Operating Temperature Range: Minimum -55°C to 175°C
RoHS3 Compliance: Required

Substitution Categories:

Direct Equivalent: Parts meeting all primary criteria with minimal parameter deviation.

Functional Equivalent: Parts exceeding voltage or current ratings while maintaining compatible gate characteristics and thermal performance.

Compatible Substitute: Parts with higher voltage ratings or current capabilities that operate within the same gate drive and thermal envelope.

Parameter Comparison

Parameter	STP14NF12 (Main)	RCX120N25	IRF520NPBF	IRF520PBF	IRF530PBF	IRFB4019PBF
Manufacturer	STMicroelectronics	Rohm Semiconductor	Infineon Technologies	Vishay Siliconix	Vishay Siliconix	Infineon Technologies
Vdss (V)	120	250	100	100	100	150
Id @ 25°C (A)	14	12	9.7	9.2	14	17
Rds On (mOhm)	180 @ 7A, 10V	—	200 @ 5.7A, 10V	270 @ 5.5A, 10V	160 @ 8.4A, 10V	95 @ 10A, 10V
Vgs(th) (V)	4 @ 250µA	—	4 @ 250µA	4 @ 250µA	4 @ 250µA	4.9 @ 50µA
Qg (nC)	21 @ 10V	—	25 @ 10V	16 @ 10V	26 @ 10V	20 @ 10V
Power Dissipation (W)	60 (Tc)	40 (Tc)	48 (Tc)	60 (Tc)	88 (Tc)	80 (Tc)
Operating Temp (°C)	-55 to 175	150 (TJ)	-55 to 175	-55 to 175	-55 to 175	-55 to 175
Package	TO-220-3	TO-220FM	TO-220AB	TO-220AB	TO-220AB	TO-220AB
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS3 Compliance	Yes	Yes	Yes	Yes	Yes	Yes
REACH Status	Unaffected	Unaffected	Unaffected	Affected	Affected	Unaffected

Engineering Selection Recommendations

RCX120N25 (Rohm Semiconductor)

The RCX120N25 provides the closest voltage rating match at 250V Vdss, exceeding the STP14NF12 specification. Continuous drain current is rated at 12A, which is 2A below the main part. This substitute is suitable for applications where voltage headroom is beneficial and current requirements do not exceed 12A. The part is active and RoHS3 compliant. Operating temperature is specified to 150°C, which is 25°C below the main part's maximum. The TO-220FM package is mechanically compatible with TO-220-3 footprints.

IRF520NPBF (Infineon Technologies)

The IRF520NPBF operates at 100V Vdss with 9.7A continuous drain current. This part is suitable only for applications where the 120V voltage requirement can be reduced to 100V. Current capability is reduced by 4.3A relative to the main part. The device is active, RoHS3 compliant, and REACH unaffected. Operating temperature range matches the main part at -55°C to 175°C. This substitute is appropriate for lower-voltage circuit variants.

IRF520PBF (Vishay Siliconix)

The IRF520PBF is rated for 100V Vdss and 9.2A continuous drain current. Similar to the IRF520NPBF, this part is limited to 100V applications and provides reduced current capability. The device is active and RoHS3 compliant but is REACH affected. Operating temperature range matches the main part. This substitute is appropriate for lower-voltage applications where REACH compliance status is not a constraint.

IRF530PBF (Vishay Siliconix)

The IRF530PBF matches the 14A continuous drain current specification of the STP14NF12 but operates at 100V Vdss. This part is suitable for applications where voltage requirements can be reduced to 100V while maintaining full current capability. The device is active, RoHS3 compliant, and provides superior on-state resistance at 160mOhm. Operating temperature range matches the main part. This substitute is appropriate for lower-voltage circuit variants requiring equivalent current handling.

IRFB4019PBF (Infineon Technologies)

The IRFB4019PBF exceeds both voltage and current specifications with 150V Vdss and 17A continuous drain current. This part provides the highest performance margin among all substitutes with superior on-state resistance at 95mOhm. The device is active, RoHS3 compliant, and REACH unaffected. Operating temperature range matches the main part at -55°C to 175°C. This substitute is appropriate for applications requiring enhanced performance headroom and is the most capable option for direct replacement in 120V+ circuits.

Frequently Asked Questions (FAQ)

Q: Can the RCX120N25 directly replace the STP14NF12 in all applications?

A: The RCX120N25 provides higher voltage rating (250V vs. 120V) but lower current capability (12A vs. 14A). Direct replacement is possible only in applications where current demand does not exceed 12A. The TO-220FM package is mechanically compatible with TO-220-3 footprints. Operating temperature maximum is 150°C, which may be a limitation in high-temperature environments.

Q: Why do the IRF520 variants show lower voltage and current ratings than the STP14NF12?

A: The IRF520NPBF and IRF520PBF are designed for 100V applications and provide 9.7A and 9.2A current capability respectively. These parts are suitable only for circuit designs where the 120V requirement can be reduced. They are not direct replacements for 120V applications.

Q: Which substitute part provides the best performance match for the STP14NF12?

A: The IRFB4019PBF provides the best overall performance match with 150V Vdss (exceeding the 120V requirement), 17A continuous drain current (exceeding the 14A requirement), and superior on-state resistance at 95mOhm. This part is active, RoHS3 compliant, and REACH unaffected.

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

A: All substitute parts use TO-220-compatible packages (TO-220AB or TO-220FM). These packages are mechanically and electrically compatible with TO-220-3 footprints and can be used as direct pin-compatible replacements on existing PCBs.

Q: What is the significance of the REACH status difference between substitute parts?

A: REACH affected status indicates the part may contain substances of very high concern (SVHC) requiring compliance documentation. IRF520PBF and IRF530PBF are REACH affected, while IRF520NPBF and IRFB4019PBF are REACH unaffected. Selection depends on regulatory requirements for the end application.

Q: Can the IRF530PBF be used as a direct replacement for the STP14NF12?

A: The IRF530PBF matches the 14A current specification but operates at 100V Vdss instead of 120V. Direct replacement is possible only in applications where the circuit voltage can be reduced to 100V. The part is active, RoHS3 compliant, and provides superior on-state resistance characteristics.

Q: What are the thermal considerations when selecting a substitute part?

A: The STP14NF12 operates from -55°C to 175°C. The RCX120N25 is limited to 150°C maximum junction temperature, which may be insufficient for high-temperature applications. All other substitutes match or exceed the -55°C to 175°C range. Power dissipation ratings vary from 40W to 88W depending on the part selected.

Q: Is the IRFB4019PBF suitable for direct replacement in existing STP14NF12 designs?

A: Yes, the IRFB4019PBF is suitable for direct replacement. It provides higher voltage (150V vs. 120V) and current (17A vs. 14A) ratings, superior on-state resistance, and matches the operating temperature range. The TO-220AB package is pin-compatible with TO-220-3. The part is active, RoHS3 compliant, and REACH unaffected.

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