LM358 dual op-amp IC — SOP-8 SMD, single supply 3V–32V, amplifier and comparator
The LM358 is one of the most widely used dual operational amplifier (op-amp) ICs, available here in the compact SOP-8 SMD package for PCB integration. It contains two independent, high-gain, internally frequency-compensated op-amps designed to operate from a single power supply over a wide voltage range of 3V to 32V (or ±1.5V to ±16V split supply). Its low supply current drain, independent of supply voltage magnitude, makes it ideal for battery-powered and low-power applications.
The LM358 is directly compatible with 3.3V and 5V digital systems, making it a go-to choice for interfacing analog sensors with microcontrollers such as Arduino, ESP32, and STM32. The SOP-8 SMD package makes it ideal for compact PCB designs where board space is at a premium, while still delivering the same reliable, predictable performance as the DIP-8 version.
Key Specifications:
- Part number: LM358
- Configuration: dual op-amp (2 independent channels)
- Single supply voltage range: 3V – 32V
- Split supply voltage range: ±1.5V – ±16V
- Input common-mode voltage range: 0V to VCC−1.5V
- DC voltage gain: 100dB (typ.)
- Unity gain bandwidth: 1MHz (typ.)
- Supply current: ~0.5mA per amplifier (typ.)
- Output: can sink and source current
- Package: SOP-8 (SMD, 8-pin)
- Operating temperature: 0°C to +70°C (commercial) / −40°C to +85°C (industrial)
Key Features:
- Single supply operation (3V–32V) — eliminates need for dual/split supply in most applications
- Two independent op-amps — two channels in one package for compact circuit designs
- Wide supply voltage range — compatible with 3.3V, 5V, 9V, and 12V systems
- Low supply current — suitable for battery-powered and portable designs
- Internally frequency compensated — stable in unity-gain configuration without external compensation
- SOP-8 SMD package — compact footprint for high-density PCB designs
Applications:
- Voltage comparator circuits
- Transducer and sensor signal amplification
- DC gain blocks and signal conditioning
- Active filters (low-pass, high-pass, band-pass)
- Oscillator and waveform generator circuits
- Arduino / ESP32 analog signal interface
- Battery voltage monitoring circuits
Variants available:
- Original — branded IC (TI, ST, or equivalent), recommended for precision and production designs
- China — compatible generic, suitable for prototyping and non-critical applications