FDPF12N50UT N-Channel MOSFET 500V 10A Equivalent & Substitute Parts

Part Overview

The FDPF12N50UT is an N-Channel MOSFET manufactured by onsemi, rated for 500V drain-to-source voltage with 10A continuous drain current at 25°C. This device is packaged in a TO-220F-3 through-hole configuration and is part of the FRFET® series. The part is currently classified as obsolete, necessitating identification of equivalent and substitute components for ongoing applications and new designs. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters while accounting for differences in performance characteristics and product lifecycle status.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	500	V
Continuous Drain Current (Id) @ 25°C	10	A (Tc)
On-State Resistance (Rds On) @ 5A, 10V	800	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	5	V
Gate Charge (Qg) @ 10V	30	nC
Power Dissipation (Max)	42	W (Tc)
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the FDPF12N50UT is determined by the following critical parameters:

Voltage Rating (Vdss): Substitute parts must equal or exceed 500V to maintain circuit protection margins. Parts rated below 500V are not suitable.

Drain Current (Id): Substitute parts must support continuous drain current of 10A or greater at 25°C to handle the same load conditions.

On-State Resistance (Rds On): Lower Rds On values indicate improved efficiency and reduced power dissipation. Substitute parts with Rds On values at or below 800mOhm @ specified conditions maintain or improve thermal performance.

Gate Charge (Qg): Lower gate charge values reduce switching losses and gate drive requirements. This parameter influences circuit efficiency but does not prevent substitution.

Package and Mounting: All substitute parts must use through-hole mounting in TO-220 family packages to ensure mechanical and thermal compatibility with existing PCB layouts.

Operating Temperature: Substitute parts must support the full -55°C to 150°C operating range or the specific range required by the application.

The following substitute parts are grouped by their relationship to the FDPF12N50UT:

MFR Recommended: FCPF380N65FL1-F154 (onsemi) — Higher voltage rating with improved Rds On performance.

Direct Manufacturer: TK11A45D(STA4,Q,M) (Toshiba) — Lower voltage rating with comparable current handling.

Similar Parts: R5009ANX (Rohm) and STP11NK50ZFP (STMicroelectronics) — Matching voltage rating with varying current and efficiency characteristics.

Parameter Comparison

Parameter	FDPF12N50UT	FCPF380N65FL1-F154	TK11A45D(STA4,Q,M)	R5009ANX	STP11NK50ZFP
Manufacturer	onsemi	onsemi	Toshiba	Rohm	STMicroelectronics
Vdss (V)	500	650	450	500	500
Id @ 25°C (A)	10	10.2	11	9	10
Rds On (mOhm)	800 @ 5A, 10V	380 @ 5.1A, 10V	620 @ 5.5A, 10V	720 @ 4.5A, 10V	520 @ 4.5A, 10V
Vgs(th) (V)	5 @ 250µA	5 @ 1mA	4 @ 1mA	4.5 @ 1mA	4.5 @ 100µA
Qg (nC)	30 @ 10V	43 @ 10V	20 @ 10V	21 @ 10V	68 @ 10V
Power Dissipation (W)	42	33	40	50	30
Operating Temp (°C)	-55 to 150	-55 to 150	to 150	to 150	-55 to 150
Package	TO-220F-3	TO-220F-3	TO-220SIS	TO-220FM	TO-220FP
Product Status	Obsolete	Not For New Designs	Active	Not For New Designs	Not For New Designs
RoHS Compliance	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3

Engineering Selection Recommendations

For Replacement in Existing Designs:

The STP11NK50ZFP (STMicroelectronics) provides the closest electrical match to the FDPF12N50UT, maintaining identical 500V voltage rating and 10A current specification. This part offers superior on-state resistance (520mOhm versus 800mOhm), resulting in reduced power dissipation and improved thermal performance. The STP11NK50ZFP is classified as "Not For New Designs" but remains suitable for sustaining existing applications. Full operating temperature range (-55°C to 150°C) is supported.

The R5009ANX (Rohm Semiconductor) also matches the 500V voltage rating and provides comparable performance with 720mOhm on-state resistance. This part supports the full operating temperature range and carries ROHS3 compliance. However, the continuous drain current rating is reduced to 9A, which may limit applicability in designs requiring the full 10A specification.

For New Designs with Higher Voltage Margin:

The FCPF380N65FL1-F154 (onsemi) is the manufacturer-recommended substitute, offering a higher 650V voltage rating with significantly improved on-state resistance (380mOhm). This part provides enhanced efficiency and thermal performance while maintaining the same TO-220F-3 package footprint. The higher voltage rating provides additional circuit protection margin. This part is classified as "Not For New Designs" and should be evaluated for long-term availability.

For Active Product Status:

The TK11A45D(STA4,Q,M) (Toshiba) is the only substitute part with active product status. This part operates at 450V (below the original 500V specification) but supports 11A continuous drain current with 620mOhm on-state resistance. The lower voltage rating may not be suitable for applications requiring the full 500V margin. This part is recommended only when active product lifecycle status is a critical requirement and the 450V rating is acceptable for the application.

All substitute parts maintain RoHS3 compliance and through-hole mounting compatibility with TO-220 family packages.

Frequently Asked Questions (FAQ)

Q: Can the FCPF380N65FL1-F154 be used as a direct replacement for the FDPF12N50UT?

A: The FCPF380N65FL1-F154 is electrically compatible as a substitute. Both parts are manufactured by onsemi and use the TO-220F-3 package. The higher 650V voltage rating and improved 380mOhm on-state resistance provide enhanced performance. However, the higher gate charge (43nC versus 30nC) may require gate drive circuit evaluation. The part is classified as "Not For New Designs," which may affect long-term availability.

Q: Why does the TK11A45D(STA4,Q,M) have a lower voltage rating than the FDPF12N50UT?

A: The TK11A45D(STA4,Q,M) is rated for 450V drain-to-source voltage, which is 50V lower than the FDPF12N50UT specification. This part is suitable only for applications where the 450V rating provides sufficient circuit protection margin. Applications requiring the full 500V rating must use alternative substitutes.

Q: What is the difference between TO-220F-3, TO-220FM, TO-220FP, and TO-220SIS packages?

A: All these packages are through-hole TO-220 family variants with three leads (drain, gate, source). The primary differences are in lead configuration and thermal characteristics. TO-220F-3, TO-220FM, and TO-220FP are mechanically compatible with standard TO-220 PCB footprints. The TO-220SIS variant (used by the TK11A45D) has a different lead arrangement and may require PCB layout verification before substitution.

Q: Can the R5009ANX be used in applications requiring 10A continuous current?

A: The R5009ANX is rated for 9A continuous drain current at 25°C, which is 1A below the FDPF12N50UT specification. This part is suitable only for applications where the 9A rating is sufficient. Applications requiring the full 10A specification must use alternative substitutes such as the STP11NK50ZFP or FCPF380N65FL1-F154.

Q: How does on-state resistance (Rds On) affect circuit performance?

A: On-state resistance determines the voltage drop across the MOSFET when conducting current. Lower Rds On values reduce power dissipation and heat generation. The FDPF12N50UT has 800mOhm Rds On, while the STP11NK50ZFP offers 520mOhm and the FCPF380N65FL1-F154 offers 380mOhm. Substituting with lower Rds On values improves efficiency but does not prevent functional compatibility.

Q: What does "Not For New Designs" product status mean?

A: "Not For New Designs" indicates that the manufacturer is not recommending the part for new circuit designs. The part may have limited availability or planned discontinuation. However, these parts remain suitable for sustaining existing applications and replacement scenarios. For new designs, the TK11A45D(STA4,Q,M) with "Active" status is preferred if the 450V rating is acceptable.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed (FCPF380N65FL1-F154, TK11A45D(STA4,Q,M), R5009ANX, and STP11NK50ZFP) are RoHS3 compliant, matching the compliance status of the FDPF12N50UT.

Q: What is gate charge (Qg) and why does it matter?

A: Gate charge is the total charge required to switch the MOSFET from off to on state. Lower gate charge values reduce switching losses and gate drive power requirements. The FDPF12N50UT has 30nC gate charge, while substitutes range from 20nC to 68nC. Higher gate charge values may require gate drive circuit evaluation but do not prevent substitution.

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