Texas Instruments LM324KDR

Overview

LM324KDR from Texas Instruments is a quad operational amplifier in SOIC-14 package, designed for cost-sensitive single-supply applications. It delivers rail-to-rail input (common-mode down to V–), 36V max supply range, ±3mV max input offset voltage (25°C), 1.2MHz gain-bandwidth product, and 240µA typical quiescent current per amplifier - enabling use in power supply monitoring, sensor signal conditioning, and industrial control interfaces.

For engineers reviewing the LM324KDR datasheet, LM324KDR pinout, LM324KDR application, or LM324KDR equivalent, this page provides verified pin functions, real-world operating limits (–40°C to +85°C), output swing data (1.35V from positive rail, 100mV from negative rail at 50µA), ESD rating (2kV HBM), and drop-in replacement guidance for legacy LM324/LM2902 designs.

Technical Context

The LM324KDR implements a standard voltage-feedback op-amp topology with internal frequency compensation for unity-gain stability. Its input stage supports common-mode voltages extending to the negative rail (V–), and its output can swing within 1.35V of V+ and 100mV of V– under light load - critical for single-supply signal acquisition. The device features integrated RF/EMI filtering and achieves 70dB minimum CMRR across 3V–36V supply range.

It operates over –40°C to +85°C ambient temperature with 240–300µA per-amplifier quiescent current (VS = 5V), and maintains 25V/mV minimum open-loop gain at full temperature range. Input bias current remains ≤35nA (max) across temperature, supporting high-impedance source interfacing without significant error.

Key Specifications

Pinout & Package

LM324KDR is housed in a 14-pin SOIC (D) package measuring 8.65mm × 6mm, with standard JEDEC MS-012AC footprint and gull-wing leads. Thermal resistance R_θJA is 99.3°C/W, supporting operation up to +85°C ambient without forced airflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad op-amp applications.

Compared with LM324DR, LM324KDR offers 2× better offset voltage and 4× higher ESD immunity; versus LM2902KDR, it trades extended temperature range for lower cost and qualification overhead in non-automotive industrial use.

Availability

LM324KDR is available at Aetrix Electronics and suitable for power supply monitoring, industrial sensor interface, and motor control feedback requiring stable component supply across long-lifecycle embedded programs.

Supply support for LM324KDR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The LM324KDR belongs to TI's industry-standard operational amplifier product line, engineered for cost-sensitive, high-volume applications where reliability, ease of use, and broad temperature operation are essential - especially in power conversion and sensor signal conditioning.

FAQ

What is the maximum supply voltage for LM324KDR?

The absolute maximum supply voltage for LM324KDR is 40V, but the recommended operating range is 3V to 36V. Operation at 36V is fully characterized across –40°C to +85°C, with quiescent current rising to 750µA per amplifier at 36V and full temperature range. Exceeding 36V risks parametric shift and reduced reliability, even if within absolute ratings.

Does LM324KDR support rail-to-rail output swing?

No, LM324KDR does not provide rail-to-rail output swing. Its output can swing to within 1.35V of V+ and 100mV of V– under 50µA load at 25°C. At heavier loads (e.g., 1mA), swing degrades to 1.6V from V+ and 0.75V from V–. For true rail-to-rail output, consider TI's TLV2464 or similar modern alternatives - LM324KDR prioritizes input rail-to-rail capability and cost efficiency over output headroom.

Is LM324KDR pin-compatible with older LM324 variants?

Yes, LM324KDR is fully pin-compatible with all standard LM324 family members in SOIC-14 (D) package, including LM324, LM324A, and LM324K. Pin numbering, function mapping, and footprint match exactly. No PCB redesign is required when upgrading from legacy versions - the B-version enhancements (lower offset, higher ESD, improved PSRR) are delivered transparently in the same mechanical form factor.

What is the operating temperature range of LM324KDR?

LM324KDR is specified for operation from –40°C to +85°C ambient temperature. This extended industrial range is confirmed in TI's official datasheet Section 6.3 and distinguishes it from commercial-grade variants like LM324 (0°C to 70°C). All key parameters - including input offset voltage (±4mV max), quiescent current (240–300µA), and open-loop gain (25V/mV min) - are guaranteed across this full range.

Can LM324KDR drive capacitive loads?

LM324KDR is characterized to safely drive up to 100pF capacitive load without oscillation, per datasheet Section 6.5. Driving larger capacitive loads (e.g., cables or ADC input capacitance >100pF) requires isolation via a series resistor (typically 10–100Ω) between the LM324KDR output and the load. Failure to isolate may cause phase margin degradation below 56°, resulting in overshoot or sustained ringing in step responses.