mmbd352wt1g

The MMBD352WT1G is an NPN small-signal transistor ideal for low-power circuits. It handles up to 80V voltage and 200mA current, making it great for low-power driving, switching circuits, and audio amplifiers. With its fast switching speed, it’s perfect for high-frequency switching applications, and its SOT-23 package is space-efficient. However, its maximum power rating is 500mW, so it’s not suitable for high-power applications. Make sure to stay within the voltage and current limits to avoid damaging the device.

mmbd352wt1g pinout and polarity

When using the MMBD352WT1G, the base (B) is where you input the signal, controlling the current flow between the emitter and collector. To switch the transistor, a small current (usually below 1mA) needs to flow into the base. The emitter (E) is the negative terminal, with current flowing from here to the base, and the collector (C) is the output, connected to the load or positive terminal of the power supply. Remember, this is an NPN transistor, so the collector voltage should be higher than the emitter, and the base voltage needs to be at least 0.7V higher than the emitter to turn it on. Maximum current is 200mA, and maximum voltage is 80V, so be sure not to exceed those limits.

mmbd352wt1g equivalent switching diode

If you’re looking for alternatives to the MMBD352WT1G, consider 1N4148, BAT54, or 1N5231B. 1N4148 is a diode with similar current and power specs, making it suitable for small signal switching circuits. It can replace the MMBD352WT1G if your circuit’s reverse voltage is under 80V. BAT54 is a Schottky diode, perfect for low voltage, low power applications. 1N5231B is a zener diode, mainly used for voltage regulation, so it’s best for specific voltage regulation scenarios, not regular switching circuits.

mmbd352wt1g rf detector circuit

This circuit you’re looking at is likely an RF detector. The signal from the antenna (30 inches) goes through two diodes (such as MMBD352WT1G) to ground, creating an envelope detector—a classic way to convert high-frequency signals to low-frequency. Next, two transistors amplify the detected signal, with a 10k resistor providing bias to the first transistor. Finally, a logic gate, probably a Schmitt trigger or buffer, converts the analog signal to digital, making it easier for your microcontroller or other circuits to read.

mmbd352wt1g smd high speed clamping

If you’re designing a clamp circuit for sensitive inputs, the MMBD352WT1G diode is a great choice. It reacts super fast—around 6ns recovery—so it quickly clamps voltage spikes, keeping your MCU or ADC safe. With low capacitance (about 1.5pF), it won’t distort high-speed signals like RF or SPI. Its dual common-cathode setup lets you clamp differential or multiple signal lines easily with just one small chip.

mmbd352wt1g tv tuner front end circuit

The circuit you’re looking at is a typical TV or radio tuner front-end module. It uses chips like LA1837 and LC72131, which are common in tuner designs. Although MMBD352WT1G isn’t directly marked here, you can see similar high-speed diodes like the 1N4148. These diodes perform the same function: RF input protection, voltage clamping, detection, or shaping signals. If you have MMBD352WT1G available, you can easily swap it into the circuit as a reliable alternative, especially for high-speed RF paths.