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LM324ADR

Quad op-amp A-grade, 3-30V single supply, 1.2MHz GBW, 3mV Vos, 100dB gain, SOIC-14 T&R, 0~70°C

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Manufacturer Part：

LM324ADR

Package：

SOIC-14 (D) (8.65 x 3.9 x 1.5 mm, 1.27mm pitch)

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Description

The LM324ADR from Texas Instruments is a quad 30-V 1.2-MHz operational amplifier in a 14-pin SOIC package with tape-and-reel packaging. It contains four independent high-gain internally compensated op-amps designed for single-supply operation from 3 V to 30 V. Key specs include 1.2-MHz gain bandwidth product, 0.5-V/µs slew rate, 3-mV max input offset voltage (A-grade), 0.175-mA per-channel quiescent current, and 100-dB voltage gain. The input common-mode range includes ground and the output swings from near 0 V to VCC-1.5 V. Operating temperature range is 0°C to +70°C. The ‘A’ suffix denotes improved offset specification; ‘DR’ denotes SOIC-14 tape-and-reel.

The LM324ADR from TI is the A-grade, SOIC-14 tape-and-reel version of the industry-standard LM324 quad operational amplifier. The A-grade improves the maximum input offset voltage from 7 mV (standard LM324) to 3 mV, providing better DC precision for measurement and control applications. The device is pin-compatible with all LM324 variants across manufacturers.

The LM324 family is one of the most produced op-amp ICs in history, used in virtually every category of electronics. The four amplifiers share common VCC and GND, with each having independent inputs and outputs. The input common-mode voltage range includes ground, enabling direct single-supply sensing of signals near the negative rail without level shifting.

Note that TI has discontinued the LM324AD (tube package) but continues to offer the LM324ADR (tape-and-reel). TI recommends the LM324B as the next-generation replacement, offering 3-36 V supply range, 3-mV max Vos, integrated EMI filtering, 2-kV HBM ESD protection, and -40°C to +125°C temperature range.

The LM324ADR is electrically identical to the LM324ADT from ST and the LM324ADR2G from onsemi. All three are pin-compatible and interchangeable in most applications. The TI version offers 1.2-MHz GBW vs the ST version’s 1.3-MHz GBW — a negligible difference in practice.

**Bipolar Input Stage:** Each amplifier uses a PNP differential input pair with a current-mirror active load. The PNP inputs enable the common-mode range to include ground and extend -0.3 V below it. Input bias current (45 nA typical) flows out of the input pins.

**Internal Compensation:** Dominant-pole compensation sets unity-gain bandwidth to 1.2 MHz and slew rate to 0.5 V/µs, ensuring stability in voltage-follower configurations without external capacitors.

**Class-AB Output:** The output can source 40 mA (Darlington pull-up) and sink approximately 20 mA at VCC = 15 V. The output cannot swing fully to ground under load due to the asymmetric drive — a pull-down resistor helps reach near-zero volts.

**Single-Supply Architecture:** Internal bias network operates from a single positive supply with no negative supply required, reducing system complexity.

Pin Name Type Description
1 1OUT O Amplifier 1 output; swings 5mV to VCC-1.5V; ±40mA drive
2 1IN- I Amplifier 1 inverting input; 45nA bias current
3 1IN+ I Amplifier 1 non-inverting input; CM range includes ground
4 VCC+ P Positive supply; 3V to 30V; bypass with 0.1µF
5 2IN+ I Amplifier 2 non-inverting input
6 2IN- I Amplifier 2 inverting input
7 2OUT O Amplifier 2 output
8 3OUT O Amplifier 3 output
9 3IN- I Amplifier 3 inverting input
10 3IN+ I Amplifier 3 non-inverting input
11 GND/VCC- G Ground / negative supply
12 4IN+ I Amplifier 4 non-inverting input
13 4IN- I Amplifier 4 inverting input
14 4OUT O Amplifier 4 output
Application Description
Multi-Channel Analog Signal Conditioning Four op-amps in one package for amplifying multiple sensor channels; 3mV Vos (A-grade) reduces DC error; single 5V or 12V supply; use as non-inverting amplifiers, difference amplifiers, or active filters
Window Comparator with Hysteresis Two op-amps form a window comparator for over/undervoltage detection; third op-amp provides reference voltage; fourth op-amp drives indicator LED; ground-sensing input range eliminates negative supply
Model Manufacturer Compatibility Key Difference
LM324BIPWR TI Recommended Replacement 3-36V supply; 3mV max Vos; integrated EMI filter; 2kV HBM ESD; -40 to +85°C; TSSOP-14; drop-in upgrade with improved robustness and wider temperature range
LM324ADT ST Pin-Compatible Equivalent Same SOIC-14 pinout; ST variant; 1.3MHz GBW; electrically equivalent; use as alternate source
LM324ADR2G onsemi Pin-Compatible Equivalent Same SOIC-14 pinout; onsemi variant; 3-32V; 3mV Vos; A-grade; use as alternate source
MCP6004T-I/ST Microchip Functional Alternative Quad CMOS op-amp; 1.8-6V; 1MHz GBW; rail-to-rail output; 1pA Ib; SOIC-14; use for low-voltage rail-to-rail applications
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We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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