5N20A MOSFET — Specifications & Equivalents
About the 5N20A
The 5N20A is a MOSFET with a drain–source voltage (VDS) rating of 200 V and a continuous drain current (ID) of 5 A. It can dissipate up to 78 W and is rated to a junction temperature of 150 °C. It is available in TO251 and TO252 packages, so confirm the pinout of the exact variant you order.
At a glance
- Type: MOSFET
- Max drain–source voltage (VDS): 200 V
- Max continuous drain current (ID): 5 A
- Power dissipation (PD): 78 W
- Max junction temperature (TJ): 150 °C
- Package: TO251, TO252
Typical applications
With its 200 V drain–source rating the 5N20A sits in the medium-high-voltage class of switching MOSFETs, typically found in telecom and industrial DC rails, boost and flyback converters, LED and backlight drivers and power-factor-correction stages. Common where the bus sits well above 100 V but below rectified mains.
Gate drive and switching notes
Keep gate–source voltage within the ±30 V maximum; exceeding it punctures the gate oxide and destroys the device permanently.
Switching behaviour is characterised by an output capacitance (Coss) of 30.2 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.
Choosing a replacement for the 5N20A
A drop-in substitute for the 5N20A should match its polarity and offer a drain–source rating of at least 200 V and a continuous drain current rating of at least 5 A.
Mechanically, check the replacement against the TO251 and TO252 footprint and confirm the pin order — parts sharing a package outline do not always share a pinout.
Where the application switches inductive loads or runs near the voltage limit, keep extra headroom rather than choosing a part that only just meets the original numbers.
Frequently asked questions
What is the 5N20A?
The 5N20A is a MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 200 V drain-source and 5 A continuous drain current.
What is the maximum voltage of the 5N20A?
The 5N20A has a maximum drain-source voltage (Vds) of 200 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.
How much current can the 5N20A handle?
It is rated for 5 A of continuous drain current, with power dissipation limited to 78 W. Real-world capability depends on your heatsinking and ambient temperature.
What package does the 5N20A come in?
It is listed in TO251 and TO252. Verify the pinout of the specific variant, as one outline can carry different pin assignments.
What can I use to replace the 5N20A?
This page lists 17 candidate equivalents matched on electrical ratings and package. Any replacement should meet or exceed the original voltage, current and dissipation figures and use a compatible drive level.
Key Specifications
| Pd ⓘ - Maximum Power Dissipation | 78 W |
|---|---|
| |Vds|ⓘ - Maximum Drain-Source Voltage | 200 V |
| |Vgs|ⓘ - Maximum Gate-Source Voltage | 30 V |
| |Id| ⓘ - Maximum Drain Current | 5 A |
| Tj ⓘ - Maximum Junction Temperature | 150 °C |
| Cossⓘ - Output Capacitance | 30.2 pF |
| Package | TO251 TO252 |
| SSH45N20AAdvanced Power MOSFETFEATURESBVDSS = 200 V Avalanche Rugged TechnologyRDS(on) = 0.065 Rugged Gate Oxide Technology Lower Input CapacitanceID = 45 A Improved Gate Charge Extended Safe Operating AreaTO-3P Lower Leakage Current | 10 A (Max.) @ VDS = 200V Low RDS(ON) : 0.054 (Typ.)1231.Gate 2. Drain 3. SourceAbsolute Maximum RatingsSymbol |
| Advanced Power MOSFETFEATURESBVDSS = 200 V Avalanche Rugged TechnologyRDS(on) = 0.065 Rugged Gate Oxide Technology Lower Input CapacitanceID = 35 A Improved Gate Charge Extended Safe Operating Area Lower Leakage Current | 10 A (Max.) @ VDS = 200V Low RDS(ON) : 0.054 (Typ.)1231.Gate 2. Drain 3. SourceAbsolute Maximum RatingsSymbol Characteristic V |