Figure 1 STW20NK50Z	Figure 2 TO-247 Package	Figure 3 Symbol
	1.         GATE2.         DRAIN 3.         SOURCE

What is STW20NK50Z？

This device is an N-channel Zener-protected Power MOSFET developed using STMicroelectronics’ SuperMESH™ technology. In addition to a significant reduction in on state resistance, this device is designed to ensure a high level of dv/dt capability for the most demanding applications.

Low on state resistance makes it suitable for power electronics converters utilized in power conversion & control. High dv/dt capability makes it superior in high voltage applications like photovoltaic power generations and VFDs.  

Fig.1 shows STW20NK50Z MOSFER IC, Fig.2 shows layout of TO-247 Package and Fig.3 shows symbol for STW20NK50Z.

Pin Configuration

Features

• Extremely high dv/dt capability
• 100% avalanche tested
• Gate charge minimized
• Very low intrinsic capacitance

ALTERNATIVES FOR STW20NK50Z

Applications

• High Current, High Speed Switching
• Ideal for Off-Line Power Supplies, Adaptors And PFC

WHERE TO USE STW20NK50Z

Major load of industrial sectors are VFDs. Efficiency of VFDs depends on the converters used to drive the motors. Low on state resistance of STW20NK50Z reduce conduction losses and makes VFDs efficient. So low on state resistance along with high dv/dt in STW20NK50Z makes it perfect choice for VFDs.

2-D VIEW AND FOOTPRINT

Figure 4 2-Dimentional View

Figure 5 2-Dimentional Footprint

How STW20NK50Z work?

STW20NK50Z MOSFET can be use in any power electronics circuit like inverter, DC-DC converter or controlled rectifier.  As mentioned previously STW20NK50Z has three terminals Gate(G), Drain(D) and Source(S). Drain and Source are called power terminals whereas Gate terminal is known as control terminal. As shown in fig. gate pulses need to be provided between Gate and Source to turn on the MOSFET. Maximum current carrying capacity of STW20NK50Z is 20A hence, one can utilize this MOSFET in an application which require current flow of lesser than 20A.

Figure 6 Use of STW20NK50Z

To use STW20NK50Z in DC/DC Converters or Multilevel Inverters, driver ICs like TLP250 or IR2101 are required. Circuit diagram of STW20NK50Z along with driver TLP250 is shown in Fig.6. MOSFET Drivers are used to fulfill two objectives 1) to provide isolation (to control circuit from power circuit). 2) to amplification (5V pulse/3.3 V pulse from controller amplifies to >10V to effectively drive MOSFET).  As shown in fig.6 TLP250 has inbuilt optocoupler along with two transistor amplification circuit. Pin configuration and appropriate connections are summarized in Table.4.

Figure 7 STW20NK50Z along with TLP250

Table 4 Connection of TLP250 with STW20NK50Z

MAX6675ISA+T Related Products Prices

Parts	Mfr.	Description	Stock	Prices	Buy Now
STW20NK50Z	STMicroelectronis	MOSFET N-CH 500V 17A TO-247	3900	$0.869 Lowest
STW20NM60FD	STMicroelectronics	MOSFET N-CH 600V 20A TO-247	1	$3.441 Lowest
STW20NM60	STMicroelectronics	MOSFET N-CH 600V 20A TO-247	1	$1.322 Lowest
STW20N95K5	STMicroelectronics	MOSFET N-CH 950V 17.5A TO-247	1	$3.982 Lowest

STW20NK50Z DATASHEET PDF