STD45P4LLF6AG datasheet, price

STD45P4LLF6AG

The STD45P4LLF6AG is an automotive-grade power MOSFET manufactured by STMicroelectronics, specifically designed for automotive electronics. This MOSFET performs exceptionally well, with a strong current capability of up to 50 amps and a reliable voltage handling of -40 volts, making it ideal for critical applications like power control and motor switching within vehicles.

One of its most attractive features is its very low on-resistance—typically around 12 milliohms. This means it generates less heat during switching, ensuring higher efficiency and ease of use. It comes in a standard DPAK (TO-252) package, making it suitable for mass production and convenient to mount onto circuit boards.

Moreover, the device can withstand a broad temperature range, from extreme cold (-55°C) to high heat (150°C). This makes it especially suitable for automotive applications requiring exceptional stability and reliability. If you’re selecting a MOSFET for automotive electronics, the STD45P4LLF6AG is definitely worth your consideration.

STD45P4LLF6AG Pinout

This pinout configuration applies specifically to the DPAK (TO-252) package used by the STD45P4LLF6AG MOSFET.

STD45P4LLF6AG Equivalent P-channel Mosfet

• Voltage and Current Ratings: All listed alternatives support a drain-source voltage (VDS) of -40V and continuous drain current (ID) ranging from -46A to -56A, aligning closely with the STD45P4LLF6AG’s specifications.

• On-Resistance (RDS): The on-resistance values are comparable, ensuring similar efficiency and thermal performance across these devices.

STD45P4LLF6AG Application Circuit

This circuit is actually pretty simple; it’s basically using a PMOS transistor as a switch to turn an LED on or off. Think of it as an electronic switch—you control a signal to decide whether the LED lights up.

Here’s how it works: Normally, there’s a 5V power supply connected to the circuit. The gate (control pin) of the PMOS is connected through a 10kΩ resistor, which pulls it up to 5V. In this state, the PMOS is off, so the LED stays dark.

When you want to turn the LED on, just pull the control signal down to a low level (0V or ground). This makes the PMOS transistor turn on, allowing current to flow from the 5V source through the PMOS transistor and the 1kΩ resistor, lighting up the LED.

If you return the control signal to a high level (5V), the PMOS turns off again, stopping current flow, and the LED turns off.

This circuit is ideal for applications where you want to control a load from the positive side of the power supply, such as automotive electronics, LED indicators on control panels, or simple electronic toys.

STD45P4LLF6AG Mosfet For Reverse Polarity Protection

Using the STD45P4LLF6AG MOSFET for reverse polarity protection is a practical solution, especially in automotive or high-current DC applications. Here’s a straightforward explanation of how it works and why it’s suitable:

How STD45P4LLF6AG works for Reverse Polarity Protection:

When used as a reverse-polarity protection device, the STD45P4LLF6AG (P-channel MOSFET) is typically connected on the positive line (high-side protection):

• Correct Polarity (Normal Operation):
  The MOSFET’s gate is connected to ground or a reference voltage lower than its source. This negative gate-source voltage causes the MOSFET to fully turn on, offering a very low-resistance path (low R_DS(on)) for current, minimizing power loss and heat generation.

• Reverse Polarity Condition:
  If the input polarity is reversed accidentally, the MOSFET’s gate-source voltage becomes positive or zero, causing the MOSFET to turn off. As a result, the MOSFET blocks current from flowing in reverse, effectively protecting the rest of the circuit.