Infineon 2N7002H6327XTSA2: Datasheet, Application Circuit, and Replacement Guide

The Infineon 2N7002H6327XTSA2 is a small-signal N-channel MOSFET that has become a fundamental component in countless modern electronic designs. Renowned for its reliability and efficiency, this transistor is a go-to solution for low-power switching applications. This article delves into its key specifications, showcases a typical application circuit, and provides guidance for finding a suitable replacement.

Datasheet Overview and Key Specifications

The datasheet for the 2N7002H6327XTSA2 reveals its characteristics as an enhancement-mode MOSFET. Its primary advantage lies in its voltage-driven operation, requiring minimal current from the control source (e.g., a microcontroller). Key parameters that define its performance include:

Drain-Source Voltage (V_DS): 60 V. This defines the maximum voltage it can block in the off-state.

Continuous Drain Current (I_D): 310 mA. The maximum continuous current it can switch through the load.

On-Resistance (R_DS(on)): Typically 1.8 Ω at V_GS = 10 V. A low R_DS(on) is crucial as it minimizes power loss and heat generation when the transistor is switched on.

Threshold Voltage (V_GS(th)): Typically 2.1 V. This is the minimum gate-to-source voltage required to turn the device on, making it compatible with standard 3.3V and 5V logic levels.

Package: It is housed in a SOT-23 surface-mount (SMD) package, ideal for space-constrained PCB designs.

Typical Application Circuit: Driving an LED with a Microcontroller

A most common use case for the 2N7002H6327XTSA2 is as a switch controlled by a microcontroller (MCU). An MCU's GPIO pin can only source a small amount of current (e.g., 20mA), which is insufficient to drive powerful LEDs or other loads directly. The MOSFET acts as a perfect intermediary.

In the circuit above:

1. The MCU's GPIO pin is connected to the gate (G) of the MOSFET through a current-limiting resistor (e.g., 100Ω).

2. The load (e.g., an LED with a series resistor) is connected between the positive supply voltage (V_DD) and the drain (D) pin.

3. The source (S) pin is connected to ground.

4. When the MCU output is set to a logic HIGH (3.3V or 5V), which is above the MOSFET's threshold voltage, the device turns on. This creates a low-resistance path between drain and source, allowing current to flow through the load and illuminating the LED.

5. When the MCU output is LOW (0V), the MOSFET is off, acting as an open switch and turning the load off.

This circuit demonstrates the MOSFET's core function: enabling a low-power signal to control a much higher-power circuit.

Replacement Guide

While a robust component, you may need a replacement due to supply chain issues or a need for slightly different performance. When searching for an alternative, consider these key parameters for cross-reference:

1. Package Type (SOT-23): Must be compatible for PCB layout.

2. Voltage and Current Ratings (V_DS, I_D): The replacement should meet or exceed the original's ratings.

3. Threshold Voltage (V_GS(th)): Critical for ensuring compatibility with your control logic voltage (3.3V/5V).

4. On-Resistance (R_DS(on)): A lower value is generally better for efficiency.

Suitable direct or near-equivalent replacements often include the BSS138, DMN3404L, and NDS3402. Always consult and compare the respective datasheets before finalizing a substitution.

ICGOODFIND: For engineers and purchasers, the Infineon 2N7002H6327XTSA2 represents an optimal blend of performance, size, and cost for low-voltage switching. Its logic-level compatibility and low on-resistance make it an industry standard. When sourcing this part or its equivalents, ensuring authenticity and comparing parametric data is essential for project success.

Keywords:

1. MOSFET

2. SOT-23

3. Logic-Level

4. On-Resistance

5. Switching