FQP50N06 MOSFET Pinout and Equivalent Replacement

FQP50N06 is an N-channel power MOSFET, originally manufactured by Fairchild Semiconductor. currently “on semi” is the authentic manufacturer of Fairchild devices. In this article, I’m sharing the FQP50N06 Pinout, an equivalent transistor for replacement, and how to read Part number of this MOSFET.

What is the FQP50N06 MOSFET?

The FQP50N06 is a powerful N-Channel MOSFET with a drain-to-source voltage of 60V and a continuous Drain current of 50A. The MOSFET comes in TO-220 Packaging. These MOSFETs are used in Power supply circuits, Inverter circuits, and other high-current-operation-needed devices.

How to Read the FQP50N06 MOSFET Part Number

FQP50N06 MOSFET marking — *Figure 1: How to read marking of MOSFET*

FQP means Fairchild QFET technology in a TO-220 package.
50 is The rated continuous drain current (50 Amps).
N is The polarity (N-Channel MOSFET).
06 is The rated breakdown voltage multiplied by 10 (60 Volts).

FQP50N06 Pinout Diagram

FQP50N06 MOSFET Pinout — *Figure 2: FQP50N06 N channel MOSFET Pinout diagram.*

MOSFET Pinout Configuration

Pin No.	Pin Name
1	Gate (G)
2	Drain (D)
3	Source (S)
Tab	Drain (D)

Table 1: Pinout configuration of FQP55n06 MOSFET

FQP50N06 MOSFET Specifications

N-Channel Power MOSFET
Package: Standard TO-220 plastic package
Maximum Drain-source voltage is 60V
50A continuous drain current.
22mΩ low on-resistance.
Gate Drive threshold voltage is 2V to 4V
Maximum power dissipation is 120W.

FQP50N06 Equivalent Replacement

The best equivalent replacement MOSFETs are FQP50N06, STP55NF06, IRFZ44V, or IRF3205. Always check the pinout and specifications before replacing with the original component.

MOSFET	V_ds	I_d	R_DS(on)	Remarks
FQP50N06	60 V	50 A	22 mΩ	Original device.
STP55NF06	60 V	55 A	15 to18 mΩ	Near-perfect drop in replacement.
IRFZ44	60 V	55 A	~17.5 mΩ	High-efficiency alternative (check gate drive compatibility).
IRF3205	55 V	110 A	~8 mΩ	Higher current capacity and its is suitable only if 55 V rating is sufficient for your circuit

Table 2: Equivalent MOSFETs and information’s.

How the FQP50N06 MOSFET Works

The MOSFET is N-channel, and it works like an electronic switch when a tiny voltage is applied to the Gate pin. When the Gate voltage is 0 volts, the MOSFET is in the open state. Their is no electrons moving between drain and source. The MOSFET blocks up to 60V, and no current will flow. Once the threshold voltage of 2-4V is crossed, then the MOSFET conducts and current flows between the drain and source pins.