The **LM358-SM1-R** is a specific part number for a widely used, low-power dual operational amplifier (Op-Amp). This component is a staple in electronic design due to its versatility and ability to operate from a single power supply. --- ### 1. Key Technical Specifications The following table highlights the core parameters of the LM358 series: | Parameter | Typical Value | | :--- | :--- | | **Number of Channels** | 2 (Dual Op-Amp) | | **Supply Voltage (Single)** | 3V to 32V | | **Supply Voltage (Dual)** | ±1.5V to ±16V | | **Gain Bandwidth Product** | 1.1 MHz | | **Input Bias Current** | 45 nA | | **Output Current per Channel** | 20 mA to 40 mA | | **Package Type** | SOP-8 / SOIC-8 (Surface Mount) | --- ### 2. Functional Features * **Single Supply Operation:** Unlike many older op-amps that require both positive and negative rails (e.g., +15V and -15V), the LM358 can operate with just a positive voltage and ground. * **Low Power Consumption:** It is designed specifically for battery-operated devices, drawing very little current. * **Common-Mode Input Range:** The input common-mode voltage range includes ground, allowing direct sensing near 0V. * **Internal Frequency Compensation:** It is internally compensated for unity gain stability, meaning it won't oscillate easily in simple buffer circuits. --- ### 3. Pinout Configuration (SOP-8) The LM358-SM1-R typically follows the standard 8-pin dual op-amp pinout: 1. **Output 1**: Output of the first amplifier. 2. **Inverting Input 1**: (-) input of the first amplifier. 3. **Non-inverting Input 1**: (+) input of the first amplifier. 4. **GND/V-**: Negative supply or ground. 5. **Non-inverting Input 2**: (+) input of the second amplifier. 6. **Inverting Input 2**: (-) input of the second amplifier. 7. **Output 2**: Output of the second amplifier. 8. **VCC+**: Positive supply voltage. --- ### 4. Common Applications * **Transducer Amplifiers:** Scaling signals from sensors (temperature, pressure, light). * **DC Gain Blocks:** Simple signal amplification in low-frequency circuits. * **Comparators:** Comparing two voltages to trigger a digital logic change. * **Active Filters:** Creating low-pass or high-pass filters for audio or sensor data processing. --- ### 5. Part Number Suffix Breakdown In the specific part number **LM358-SM1-R**: * **LM358**: The base model (Dual Low Power Op-Amp). * **SM1**: Often refers to the specific package variant (Small Outline / SOP-8). * **R**: Generally indicates "Tape and Reel" packaging, used for automated SMT (Surface Mount Technology) assembly.