LM358 Low Power Dual Op-amp IC SOP-8

LM358 Low Power Dual Op-amp IC SOP-8 is a foundational, highly versatile integrated circuit that packages two independent, high-gain, frequency-compensated operational amplifiers into a single chip. This makes the LM358 an extremely popular choice for a vast range of signal conditioning tasks. Consequently, design engineers rely on it heavily for applications requiring low power consumption and single-supply operation. The device conveniently operates from a wide voltage range, spanning from a single 3V supply up to a dual ±16V supply, while drawing minimal quiescent current. Furthermore, its low input bias current and large voltage gain capability ensure excellent performance in transducer amplifiers, DC gain blocks, and general analog circuit functionality. Therefore, you can easily integrate this SOP-8 surface-mount package into compact, battery-powered electronics or industrial control systems where space and energy efficiency are critical.

Key Features:

• Dual Independent Amplifiers: The IC contains two completely separate operational amplifiers, allowing you to implement two distinct functions with a single chip.
• Single-Supply Operation: The LM358 functions optimally from a single power supply over a wide range (3 V to 32 V), which simplifies power management in many designs.
• Low Power Consumption: This dual op-amp draws minimal supply current, making it an excellent choice for portable, battery-operated equipment.
• Internal Frequency Compensation: The amplifiers feature built-in compensation, ensuring stable operation even when you employ unity-gain configurations without external components.
• High Voltage Gain: It offers a large voltage gain (≈ 100 V/mV), providing strong amplification capability for weak input signals.

Technical Specifications:

• Number of Amplifiers: 2
• Supply Voltage Range (V_CC): 3 V to 32 V (Single Supply) or ±1.5 V to ±16 V (Dual Supply)
• Input Offset Voltage (V_IO): Typically 2 mV (≤ 7 mV max)
• Large Signal Voltage Gain (A_V): Typically 100 dB (100 V/mV)
• Input Bias Current (I_B): Typically 45 nA (≤ 250 nA max)
• Gain Bandwidth Product (GBWP): 0.7 MHz typical
• Slew Rate: 0.3 V/μs typical
• Operating Temperature Range: −40°C to +85°C

Mechanical Specifications:

• Package Type: SOP-8 (Small Outline Package, 8-Pin)
• Mounting: Surface Mount Technology (SMT/SMD)
• Lead Finish: Lead-free (Pb-Free)
• Moisture Sensitivity Level (MSL): Typically MSL 1 (Unlimited floor life at ≤ 30°C/85% RH)

Dimensions:

• Body Length: ≈ 4.9 mm
• Body Width: ≈ 3.9 mm
• Pin Pitch (E): 1.27 mm (0.05 inch)
• Height (A): ≈ 1.5 mm
• Total Weight: ≈ 0.05 g (Ultra-lightweight)

Pinout and Wiring:

• Pin 1 (1 OUT): Output of the first operational amplifier.
• Pin 2 (1 − IN): Inverting input of the first operational amplifier.
• Pin 3 (1 + IN): Non-inverting input of the first operational amplifier.
• Pin 4 (GND): Negative power supply pin (V− or Ground).
• Pin 5 (2 + IN): Non-inverting input of the second operational amplifier.
• Pin 6 (2 − IN): Inverting input of the second operational amplifier.
• Pin 7 (2 OUT): Output of the second operational amplifier.
• Pin 8 (VCC): Positive power supply pin (V+).

Datasheet Reference:

• Download LM358 Datasheet

Commonly Used in:

• Audio Electronics: Used as pre-amplifiers, mixers, and tone control circuits in low-power audio equipment.
• Sensor Signal Conditioning: Designers frequently employ it to amplify and filter low-level signals from temperature, light, and pressure sensors.
• Active Filters: It forms the core component of active low-pass, high-pass, and band-pass filters in analog processing stages.
• Comparators: The LM358 easily configures as a dual voltage comparator for general-purpose threshold detection.

Applications:

• Data Acquisition Systems: Amplifying and leveling transducer outputs before analog-to-digital conversion (ADC).
• Power Supply Monitoring: Creating low battery indicators and power sequencing circuits.
• Medical Devices: However, its low power nature makes it suitable for use in portable patient monitoring and diagnostic equipment.
• General DC Gain Blocks: Providing voltage amplification in countless educational and hobbyist circuit designs.

Equivalent Models:

• LM358A: A precision version offering guaranteed superior electrical characteristics, particularly lower input offset voltage.
• UA747: An older, similar dual op-amp that the LM358 often replaces due to its superior single-supply performance.
• TLC272: A CMOS equivalent from Texas Instruments that offers very low noise and rail-to-rail output characteristics, consequently providing an upgrade path.

Package Includes:

• 1 x LM358 Low Power Dual Op-amp IC SOP-8