The **HPA-15-R** is a high-performance, high-voltage operational amplifier (Op-Amp) manufactured by **Apex Microtechnology**. It is specifically designed to handle high-speed signals while maintaining a high output voltage swing. Below is a breakdown of its electronic specifications, internal architecture, and common applications. --- ### 1. Key Technical Specifications The HPA-15-R is distinguished by its ability to drive capacitive loads and its wide power supply range. | Parameter | Specification | | :--- | :--- | | **Supply Voltage (Vcc)** | ±15V to ±150V | | **Output Current** | 150 mA (Peak) | | **Slew Rate** | 1000 V/µs (Typical) | | **Gain Bandwidth Product** | 100 MHz | | **Input Offset Voltage** | 2 mV (Typical) | | **Package Type** | TO-3 (Hermetic Metal Can) | --- ### 2. Internal Electronic Parts & Design The HPA-15-R utilizes a hybrid circuit design, combining different semiconductor technologies to achieve its high-speed performance: * **Input Stage:** Typically utilizes **FET (Field Effect Transistor)** inputs. This provides very high input impedance and low bias currents, ensuring that the amplifier does not load the signal source. * **Gain Stage:** A high-speed cascode configuration is used to minimize the "Miller Effect," allowing the device to achieve its 1000 V/µs slew rate. * **Output Stage:** Features a **Complementary MOSFET** or Bipolar output. It is designed to be "Short Circuit Protected," meaning it has internal mechanisms to prevent destruction if the output is accidentally grounded. * **Compensation:** It is internally compensated for stability, though it is optimized for high-speed transitions rather than purely DC precision. --- ### 3. Pin Configuration (TO-3 Package) The device uses a standard high-power metal package to dissipate heat effectively. 1. **-IN:** Inverting Input 2. **+IN:** Non-Inverting Input 3. **-Vs:** Negative Power Supply 4. **OUT:** Signal Output 5. **+Vs:** Positive Power Supply 6. **Case:** Usually tied to a specific potential or left floating (check specific datasheet revision). --- ### 4. Critical External Components To operate the HPA-15-R safely, the following electronic parts are usually required in the circuit: * **Bypass Capacitors:** High-voltage ceramic capacitors (0.1µF to 1.0µF) must be placed as close to the power pins as possible to prevent high-frequency oscillations. * **Heat Sink:** Due to the high voltage and 150mA current capacity, the TO-3 package requires a substantial heat sink to prevent thermal shutdown. * **Current Limiting Resistors:** Often placed at the output to protect sensitive downstream components from the high-voltage swing. --- ### 5. Common Applications * **Piezoelectric Transducer Drivers:** Driving high-capacitance piezo elements in ultrasound or micro-positioning. * **Electrostatic Deflection:** Used in scientific instrumentation to move electron beams. * **High-Speed Magnetic Deflection:** Driving coils in specialized imaging equipment. * **Automatic Test Equipment (ATE):** Providing high-speed, high-voltage pulses for component testing. ---