### HV210-SM02-R: Electronic Specifications and Overview The **HV210-SM02-R** is a high-voltage, high-speed monolithic 4-channel analog switch, typically manufactured by Microchip Technology (formerly Supertex). It is designed for applications requiring high-voltage switching, such as medical ultrasound imaging and non-destructive testing (NDT). --- ### Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Number of Channels** | 4 (SPST - Single Pole Single Throw) | | **Switch Configuration** | Normally Open (NO) | | **Max Analog Voltage ($V_{PP} - V_{NN}$)** | 200V | | **Current Output (Peak)** | 2.0A | | **Input Logic** | 3.3V / 5.0V CMOS Compatible | | **On-Resistance ($R_{ON}$)** | ~22 $\Omega$ (Typical) | | **Package Type** | QFN (Surface Mount) | --- ### Core Electronic Components & Architecture 1. **High-Voltage MOSFETs**: The core of the device consists of DMOS (Double-diffused Metal Oxide Semiconductor) switches. These allow for the handling of high peak currents (up to 2A) and high voltages without breakdown. 2. **Logic Interface**: It features a low-voltage CMOS logic interface that controls the high-voltage gates. This isolates the sensitive digital control circuitry from the high-voltage analog path. 3. **Level Shifters**: Integrated level shifters translate the 3.3V/5V logic signals up to the high-voltage rails ($V_{PP}$ and $V_{NN}$) required to drive the power MOSFET gates. 4. **Bleed Resistors**: Typically, these units include integrated bleed resistors (depending on the specific sub-variant) to discharge capacitive loads, ensuring safety and signal integrity when the switch is off. --- ### Pinout Functionality The "SM" in the part number usually refers to a specific Surface Mount package footprint (like QFN). The typical pin functions include: * **VPP / VNN**: High-voltage positive and negative power supplies. * **VDD**: Low-voltage logic supply (usually 5V). * **IN1 - IN4**: Digital control inputs for each of the four switches. * **SW1 - SW4**: High-voltage analog switch terminals. * **GND**: System ground. --- ### Typical Application Circuit The device is used to multiplex high-voltage pulses from a transmitter to different transducer elements in an ultrasound probe. ```cpp // Logic Truth Table // Logic IN | Switch State | Description // ---------|--------------|------------ // L | OFF | High Isolation // H | ON | Low Resistance Path ``` ---