The **HWS382** is an integrated circuit (IC) primarily used as a **GaAs (Gallium Arsenide) SPDT (Single Pole Double Throw) Switch**. It is commonly found in wireless communication devices like mobile phones and WLAN modules because of its low insertion loss and high isolation characteristics. --- ## 1. Core Technical Specifications The HWS382 is designed for switching between two RF (Radio Frequency) paths, such as switching between an antenna and a receiver/transmitter. | Feature | Specification | | :--- | :--- | | **Frequency Range** | 100 MHz to 3.0 GHz | | **Insertion Loss** | 0.4 dB @ 1.0 GHz (Low Loss) | | **Isolation** | 27 dB @ 1.0 GHz | | **P1dB** | +30 dBm typical (High Power Handling) | | **Control Voltage** | 0 to +3V / +5V logic | | **Package Type** | SOT-363 (Small Form Factor) | --- ## 2. Pin Configuration (SOT-363) The HWS382 usually features a 6-pin layout. Understanding the pins is crucial for PCB integration. | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | RF1 | RF Port 1 (Output/Input) | | 2 | GND | Ground | | 3 | RF2 | RF Port 2 (Output/Input) | | 4 | V2 | Control Voltage 2 | | 5 | RFC | RF Common Port (Antenna Port) | | 6 | V1 | Control Voltage 1 | --- ## 3. Truth Table (Operation Logic) The switch is controlled by DC voltages applied to V1 and V2. Usually, when one control pin is High (V_high), the other must be Low (0V). | Control V1 | Control V2 | RFC to RF1 | RFC to RF2 | | :--- | :--- | :--- | :--- | | High | Low | **ON** (Connected) | OFF (Isolated) | | Low | High | OFF (Isolated) | **ON** (Connected) | --- ## 4. Key Electronic Characteristics * **Low Insertion Loss:** Minimizes signal strength degradation as the RF signal passes through the switch. * **High Power Handling:** Capable of handling up to 1 Watt (30 dBm) of RF power, making it suitable for transmit/receive (T/R) switching. * **GaAs Technology:** Uses Gallium Arsenide for faster electron mobility compared to standard Silicon, allowing for better performance at gigahertz frequencies. * **DC Blocking:** It is standard practice to use external **DC blocking capacitors** (typically 47pF to 100pF) on all RF ports (RFC, RF1, RF2) to prevent DC current from interfering with RF equipment. --- ## 5. Typical Application Circuit ```text C_block +-------+ C_block RF1 <----||-----------| HWS |-----------||----> RF2 | 382 | RFC <----||-----------| | C_block +-------+ | | V1 V2 (Logic Control) ```