The **F393D** is a specific variant of the widely-used **LM393** family. It is a dual independent precision voltage comparator. It is designed to operate from a single power supply over a wide range of voltages. --- ## 1. Technical Specifications The F393D typically comes in an **SOIC-8** (Surface Mount) package. Below are the primary electronic characteristics: | Parameter | Specification | | :--- | :--- | | **Number of Channels** | 2 (Dual Comparator) | | **Supply Voltage (Single)** | 2V to 36V | | **Supply Voltage (Dual)** | ±1V to ±18V | | **Output Type** | Open Collector | | **Response Time** | 1.3 µs | | **Operating Temperature** | -40°C to +85°C (Standard) | --- ## 2. Pinout Configuration The F393D is an 8-pin integrated circuit. The internal architecture consists of two separate operational amplifiers optimized for comparison. | Pin Number | Function | Description | | :--- | :--- | :--- | | 1 | **OUT A** | Output of Comparator A | | 2 | **IN A (-)** | Inverting Input of Comparator A | | 3 | **IN A (+)** | Non-inverting Input of Comparator A | | 4 | **GND / V-** | Ground or Negative Power Supply | | 5 | **IN B (+)** | Non-inverting Input of Comparator B | | 6 | **IN B (-)** | Inverting Input of Comparator B | | 7 | **OUT B** | Output of Comparator B | | 8 | **Vcc / V+** | Positive Power Supply | --- ## 3. Key Operational Features ### Open Collector Output The output stage of the F393D is an **Open Collector**. This means: * It can only "sink" current (pull the voltage to ground). * To get a "High" signal, you **must** use an external **pull-up resistor** connected to the desired logic voltage (e.g., 5V or 3.3V). * This allows for "Wired-OR" logic connections. ### Common Mode Input Range The input common-mode voltage range includes ground, even though the device is operated from a single power supply voltage. This makes it ideal for sensing low-level signals near 0V. --- ## 4. Typical Applications * **Limit Comparators:** Checking if a sensor voltage exceeds a certain threshold. * **Zero-Crossing Detectors:** Identifying when an AC signal crosses the 0V mark. * **Square Wave Generators:** Converting sine waves or analog signals into digital pulses. * **Voltage Level Translators:** Moving a signal from a high voltage domain to a low voltage logic domain.