LM324N (Low Power Quad Operational Amplifier - 14-Pin DIP Package)

When your electronics project requires amplifying weak analog signals, filtering audio frequencies, or reading delicate sensors, the LM324 is the industry-standard silicon you reach for. This classic 14-pin integrated circuit houses four completely independent, high-gain, frequency-compensated operational amplifiers. What made the LM324 a revolutionary component upon its release—and why it remains an absolute staple on every maker’s workbench today—is its ability to operate flawlessly off a single power supply.

Unlike older op-amps (like the 741) that absolutely require a split power supply (e.g., +12V and -12V) to function correctly, the LM324 is perfectly happy running off the exact same 5V or 3.3V power rail that is powering your Arduino or ESP32. Furthermore, its input common-mode voltage range includes Ground, meaning it can sense signals all the way down to zero volts without clipping. Whether you are conditioning the signal from a tiny microphone, building an active low-pass filter for a subwoofer, or just needing four simple voltage comparators on a single chip, the LM324 is an incredibly robust, low-cost solution.

Key Features & Functional Advantages:

• Quad Amplifier Array: Packs four independent operational amplifiers into a single 14-pin footprint, saving massive amounts of board space and reducing your Bill of Materials (BOM) cost.

• Single Supply Operation: Specifically designed to run from a single positive voltage rail (anywhere from 3V up to 32V), completely eliminating the need for complex, dual-rail power supply designs.

• Ground-Sensing Inputs: The input common-mode voltage range includes Ground (0V), allowing it to accurately read low-level sensor signals directly referencing the negative rail.

• Low Power Consumption: Engineered to draw very low quiescent current (typically under 1mA for the entire chip), making it an excellent choice for battery-powered, always-on sensor nodes.

• Breadboard Native (14-DIP): The standard 0.1-inch pin pitch drops flawlessly into any solderless breadboard or standard 14-pin DIP socket for rapid analog prototyping.

Perfect For:

• Sensor Signal Conditioning: The absolute standard for amplifying weak analog voltages from thermistors, photoresistors (LDRs), and piezoelectric sensors before feeding them into a microcontroller's ADC.

• Active Audio Filters: Highly effective for building custom low-pass, high-pass, and band-pass filters for DIY audio synthesizers and guitar effect pedals.

• Analog Comparators: While dedicated comparators exist, the LM324 is incredibly popular for acting as a basic voltage comparator in DIY circuits to trigger an event when a sensor crosses a specific threshold.

• DC Gain Blocks: Easily configured as an inverting or non-inverting amplifier to boost small control voltages in mechatronic and industrial control systems.

Technical Specifications:

• Amplifier Type: General Purpose Operational Amplifier

• Number of Channels: 4 (Quad)

• Operating Supply Voltage (Single): 3V to 32V DC

• Operating Supply Voltage (Dual): ±1.5V to ±16V DC

• Unity Gain Bandwidth Product: ~1.2 MHz (Typical)

• Slew Rate: 0.5 V/µs

• Input Bias Current: 45 nA (Typical)

• Supply Current (Total): 0.7 mA to 1.2 mA

• Package / Case: 14-DIP (0.300", 7.62mm width)

• Mounting Type: Through-Hole (PTH)

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