The **MMBF170L-AE2-R** is an N-Channel enhancement mode Field Effect Transistor (MOSFET) produced using high cell density, DMOS technology. It is designed to minimize on-state resistance while providing rugged, reliable, and fast switching performance. --- ### 1. Key Technical Specifications The following table highlights the primary electrical characteristics of the MMBF170L-AE2-R: | Parameter | Symbol | Value | | :--- | :--- | :--- | | **Drain-Source Voltage** | $V_{DSS}$ | 60 V | | **Gate-Source Voltage** | $V_{GSS}$ | ±20 V | | **Continuous Drain Current** | $I_D$ | 300 mA | | **Drain-Source On-Resistance** | $R_{DS(on)}$ | 5.0 Ω (max) @ $V_{GS}=10V$ | | **Gate Threshold Voltage** | $V_{GS(th)}$ | 0.8 V to 3.0 V | | **Total Power Dissipation** | $P_D$ | 225 mW | | **Package Type** | SOT-23 | Surface Mount | --- ### 2. Functional Description This device belongs to the small-signal MOSFET category. Its internal structure allows it to act as a high-speed switch or a low-power amplifier. * **Enhancement Mode:** This means the device is "Normally OFF." It requires a positive voltage on the Gate relative to the Source to create a conduction channel. * **Low Threshold:** With a minimum $V_{GS(th)}$ of 0.8V, it is compatible with low-voltage logic levels (TTL/CMOS), making it ideal for interfacing microcontrollers with higher voltage loads. --- ### 3. Pin Configuration (SOT-23) The device follows the standard SOT-23 pinout: 1. **Gate (G):** Controls the flow of current between Drain and Source. 2. **Source (S):** The terminal where current enters the channel (usually connected to ground for N-Channel). 3. **Drain (D):** The terminal where current leaves the channel (connected to the load). --- ### 4. Typical Applications Due to its small footprint and switching characteristics, the MMBF170L-AE2-R is commonly used in: * **Level Shifters:** Converting signal voltages between different logic families. * **Relay/Solenoid Drivers:** Switching small inductive loads. * **Power Management:** Serving as a "pass transistor" in battery-operated portable equipment. * **Signal Switching:** High-speed digital line switching. --- ### 5. Part Number Breakdown The suffixing often denotes specific manufacturing details: * **MMBF170:** The base part number (N-Channel MOSFET). * **L:** Lead-free/Halogen-free designation. * **AE2:** Typically refers to the specific SOT-23 package variant or lead finish. * **R:** Indicates "Tape and Reel" packaging for automated assembly.