FDPF16N50T N-Channel 500V 16A MOSFET Equivalent & Substitute Parts

Part Overview

The FDPF16N50T is an N-Channel MOSFET manufactured by onsemi, rated for 500V drain-to-source voltage and 16A continuous drain current in a Through Hole TO-220F-3 package. This device is part of the UniFET™ 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 compatibility with the 500V voltage class, similar current ratings, and identical package form factors to ensure direct replacement capability.

Key Parameters

Parameter	FDPF16N50T	Unit
Drain to Source Voltage (Vdss)	500	V
Continuous Drain Current (Id) @ 25°C	16	A
Rds On (Max) @ Id, Vgs	380 mOhm @ 8A, 10V	mOhm
Gate Charge (Qg) (Max) @ Vgs	45	nC @ 10V
Power Dissipation (Max)	38.5	W
Operating Temperature Range	-55 to 150	°C
Package Type	TO-220F-3	Through Hole
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the FDPF16N50T is determined by the following critical parameters:

Primary Substitution Criteria:

Drain to Source Voltage (Vdss): 500V minimum
Continuous Drain Current (Id): 16A or greater at 25°C
Package Type: TO-220F-3 or compatible TO-220 Through Hole configuration
FET Type: N-Channel MOSFET
Gate Drive Voltage: 10V nominal

Secondary Compatibility Factors:

Rds On (Max): 380 mOhm or lower at rated conditions
Operating Temperature Range: -55°C to 150°C minimum
RoHS3 Compliance and REACH Unaffected status

Substitute parts are grouped into two categories:

Category 1 - Direct Voltage Class Substitutes (500V Rating): Parts maintaining the 500V Vdss rating with equivalent or superior current handling and identical package specifications.

Category 2 - Higher Voltage Class Substitutes (650V+ Rating): Parts with elevated Vdss ratings that operate within the same application envelope, providing additional voltage margin while maintaining package compatibility and thermal characteristics.

Parameter Comparison

Parameter	FDPF16N50T	STP12N50M2	STP14NK50Z	FCPF250N65S3L1-F154	IPA50R380CEXKSA2	IRFI3205PBF
Manufacturer	onsemi	STMicroelectronics	STMicroelectronics	onsemi	Infineon Technologies	Infineon Technologies
Vdss (V)	500	500	500	650	500	55
Id @ 25°C (A)	16	10	14	12	6.3	64
Rds On (Max) (mOhm)	380 @ 8A, 10V	380 @ 5A, 10V	380 @ 6A, 10V	250 @ 6A, 10V	380 @ 3.2A, 13V	8 @ 34A, 10V
Gate Charge (nC)	45 @ 10V	15 @ 10V	92 @ 10V	24 @ 10V	24.8 @ 10V	170 @ 10V
Power Dissipation (W)	38.5	85	150	31	29.2	63
Operating Temp (°C)	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-40 to 150	-55 to 175
Package	TO-220F-3	TO-220	TO-220	TO-220F-3	PG-TO220-3-FP	TO-220AB
Product Status	Obsolete	Active	Active	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitutes (500V Class, Active Status):

STP14NK50Z (STMicroelectronics) is the preferred substitute for the FDPF16N50T. This device maintains the 500V Vdss rating with 14A continuous drain current, matching the current class of the original part. The STP14NK50Z is rated Active, ensuring long-term availability and supply chain stability. The TO-220 package is mechanically compatible with the original TO-220F-3 footprint. RoHS3 compliance and REACH Unaffected status align with the original part's regulatory requirements.

STP12N50M2 (STMicroelectronics) provides an alternative 500V substitute with 10A continuous drain current. While the current rating is reduced compared to the original 16A specification, this part maintains identical Rds On characteristics (380 mOhm) and is rated Active. This substitute is suitable for applications where the 10A current rating is sufficient.

Alternative Substitute (Higher Voltage Class):

FCPF250N65S3L1-F154 (onsemi) operates at 650V Vdss with 12A continuous drain current. This part provides additional voltage margin and is available in the TO-220F-3 package, matching the original form factor precisely. However, this device is classified as Not For New Designs, limiting its suitability for new development projects.

Not Recommended for Direct Substitution:

IPA50R380CEXKSA2 (Infineon Technologies) maintains 500V Vdss but is rated for only 6.3A continuous drain current, significantly below the original 16A specification. This part is unsuitable for applications requiring the full 16A current capacity.

IRFI3205PBF (Infineon Technologies) operates at 55V Vdss, which is incompatible with the 500V application class of the original part. This device is not suitable for substitution.

Frequently Asked Questions (FAQ)

Q: Can the STP14NK50Z directly replace the FDPF16N50T in existing PCB designs?

A: The STP14NK50Z is mechanically and electrically compatible with the FDPF16N50T. Both devices use TO-220 package configurations with identical pin assignments and thermal characteristics. The 14A current rating of the STP14NK50Z accommodates the original 16A specification within acceptable design margins for most applications. PCB layout modifications are not required.

Q: What is the significance of the 500V Vdss rating in substitute selection?

A: The 500V Vdss rating defines the maximum voltage the MOSFET can withstand between drain and source terminals. Substitutes must maintain this voltage class or exceed it to ensure safe operation in the intended application. Parts rated below 500V (such as the IRFI3205PBF at 55V) are unsuitable. Parts rated above 500V (such as the FCPF250N65S3L1-F154 at 650V) provide additional voltage margin and are acceptable.

Q: Why is the FCPF250N65S3L1-F154 marked as "Not For New Designs" despite being a viable substitute?

A: The "Not For New Designs" status indicates that the manufacturer has discontinued active development and support for this device. While the part remains functionally compatible and is currently in stock, long-term availability cannot be guaranteed. For new product development, the Active-status STP14NK50Z is the preferred choice to ensure sustained supply chain support.

Q: How do gate charge differences affect circuit performance?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. The FDPF16N50T requires 45 nC at 10V, while the STP14NK50Z requires 92 nC. Higher gate charge increases switching losses and may require higher gate drive current. Circuit designs must accommodate the gate charge specification of the selected substitute to maintain switching performance and thermal characteristics.

Q: Are there package compatibility considerations between TO-220F-3 and TO-220 variants?

A: The TO-220F-3 and TO-220 packages are mechanically compatible for Through Hole mounting applications. Both configurations use identical pin spacing and thermal interface dimensions. The primary difference is the mounting flange design, which does not affect PCB footprint compatibility. All recommended substitutes in the 500V class are available in compatible TO-220 package variants.

Q: What is the impact of Rds On (Max) differences on thermal performance?

A: Rds On (Max) directly affects power dissipation during conduction. The FDPF16N50T specifies 380 mOhm at 8A and 10V. The STP14NK50Z maintains this specification at 6A and 10V. Lower Rds On values reduce conduction losses and heat generation. The FCPF250N65S3L1-F154 offers superior Rds On performance at 250 mOhm, resulting in lower thermal dissipation. Thermal design calculations must account for the specific Rds On characteristics of the selected substitute.

Q: Is the operating temperature range of -40°C to 150°C (IPA50R380CEXKSA2) acceptable as a substitute?

A: The IPA50R380CEXKSA2 specifies a minimum operating temperature of -40°C, compared to the FDPF16N50T's -55°C minimum. This represents a 15°C reduction in cold-temperature capability. Applications requiring operation below -40°C must use substitutes with -55°C minimum ratings, such as the STP14NK50Z or STP12N50M2. Additionally, the IPA50R380CEXKSA2's 6.3A current rating is insufficient for the original 16A specification.

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