STMicroelectronics LM324DT

ST LM324DT Quad Low-Power Operational Amplifier

The ST LM324DT is a low-power quad operational amplifier designed by STMicroelectronics that integrates four independent high-gain internally frequency-compensated op-amps in a single 14-pin SOIC package. This general-purpose amplifier operates from a single power supply with a wide voltage range of 3V to 32V (±1.5V to ±16V for dual supply configurations), making it exceptionally versatile for various analog circuit applications. The device features a gain bandwidth product of 1.3MHz and a slew rate of 0.4V/μs, offering balanced performance for low-frequency signal conditioning and processing tasks. With its low input bias current of 20nA and input offset voltage of 2-7mV (depending on variant), the LM324DT provides adequate precision for many industrial and consumer applications. The quad amplifier configuration allows designers to implement multiple analog functions while minimizing board space and component count, particularly beneficial in compact electronic designs where space optimization is critical.

ST LM324DT quad op-amp Key Features and Specifications

The LM324DT operational amplifier boasts several notable characteristics including a wide power supply range (3V to 32V single supply or ±1.5V to ±16V dual supply), low supply current consumption of 1.5mA (independent of power supply voltage), and a high voltage gain of 100dB. The device exhibits a common-mode input voltage range that includes ground (negative rail), enabling direct sensing near zero volts without requiring negative supply rails. With an output current capability of 20-70mA (depending on specific operating conditions) and short-circuit protection, the amplifier can drive modest loads directly. The 80dB common-mode rejection ratio (CMRR) ensures good noise immunity in electrically noisy environments. Operating within a temperature range of 0°C to 70°C (commercial grade), the LM324DT maintains stable performance across typical environmental conditions. The surface-mount SOIC-14 package (8.65mm x 3.90mm x 1.75mm dimensions) makes it suitable for automated assembly processes in modern electronics manufacturing.

Op-amp IC Applications and Use Cases

This quad operational amplifier finds extensive application across diverse electronic systems including transducer amplifiers, DC gain blocks, conventional op-amp circuits, industrial control systems, and consumer electronics. The LM324DT is particularly well-suited for battery-powered devices due to its low power consumption characteristics, with typical applications including signal conditioning for sensors, active filters, voltage followers, comparators, oscillators, and summing amplifiers. In industrial settings, it's commonly used in process control instrumentation, power supply control circuits, and analog computing functions. The device's ability to operate with a single power supply makes it ideal for portable equipment such as handheld meters, medical monitoring devices, and automotive electronics where space and power efficiency are paramount. Additionally, its robustness against latch-up and ESD events (thanks to internal ESD protection clamps) enhances reliability in harsh electrical environments.

ST amplifier IC Alternative Models and Substitutes

● LM324D (STMicroelectronics)

● LM324DR2G (ON Semiconductor)

● LM324MX/NOPB (Texas Instruments)