Infineon BSS84PWH6327 P-Channel Logic Level MOSFET: Datasheet, Application Circuit, and SOT-323 Package Overview
The Infineon BSS84PWH6327 is a P-Channel logic level enhancement mode MOSFET designed for efficient power management in low-voltage applications. Its ability to be driven directly from logic circuits (microcontrollers, FPGAs, etc.) makes it an indispensable component in modern electronic design, particularly where space and power efficiency are critical.
Datasheet Key Specifications and Features
The BSS84PWH6327 is characterized by its low threshold voltage (VGS(th)), typically -1.5V, which ensures reliable switching with logic-level signals of 3.3V or 5V. This is its defining feature as a logic-level compatible device.
Other crucial parameters from the datasheet include:
Drain-Source Voltage (VDS): -60V, offering a good safety margin for low-voltage systems.
Continuous Drain Current (ID): -130mA, suitable for a wide range of load-switching and amplification tasks.
On-Resistance (RDS(on)): A low 12Ω (max.) at VGS = -10V and an excellent 20Ω (max.) at VGS = -4.5V, ensuring minimal voltage drop and power loss during conduction.
Small-Signal Characteristics: Featuring low input and output capacitance, it enables very fast switching speeds, which is vital for PWM applications.
SOT-323 Package Overview
The device is housed in a SOT-323 (Small Outline Transistor) package. This surface-mount package is renowned for its extremely compact footprint, which is approximately 30% smaller than the common SOT-23. Despite its miniaturized size, it provides a robust structure for PCB mounting and offers adequate thermal performance for the power levels it handles. This makes the BSS84PWH6327 ideal for space-constrained applications like smartphones, portable electronics, IoT modules, and densely packed PCBs.
Application Circuit: Load Switch Example
A primary application for the BSS84PWH6327 is a high-side load switch. This configuration is preferred for its ability to completely disconnect a load from the power supply, eliminating any residual current consumption when the load is off.
How it works:
1. The microcontroller GPIO pin is connected to the gate of the MOSFET through a resistor (e.g., 10kΩ).
2. When the GPIO output is set to logic LOW (0V), the voltage difference between the source (connected to VDD) and the gate is -VDD. This turns the P-Channel MOSFET ON, allowing current to flow from the power supply to the load.
3. When the GPIO output is set to logic HIGH (3.3V/5V), the VGS approaches 0V. This turns the MOSFET OFF, disconnecting the load from the power supply.
A pull-up resistor on the gate can ensure the MOSFET remains off during microcontroller reset, and a series gate resistor can help dampen any ringing caused by parasitic inductance.
ICGOODFIND Summary
The Infineon BSS84PWH6327 stands out as a highly reliable and efficient solution for low-power, logic-level switching. Its combination of a low threshold voltage, low on-resistance, and an ultra-compact SOT-323 package makes it perfectly suited for a vast array of modern electronics, from battery-powered portable devices to sophisticated digital control systems. Engineers can leverage its performance to create more efficient and smaller product designs.
Keywords:
P-Channel MOSFET
Logic Level
SOT-323
Load Switch
Low On-Resistance
