Texas Instruments LM224NG4

Overview

LM224NG4 from Texas Instruments is a quad operational amplifier in SOIC-14 package, designed for cost-sensitive industrial and consumer applications requiring rail-to-rail input capability, 3V to 36V supply operation, ±3mV max input offset voltage, and unity-gain stability. It serves as a precision signal conditioning and sensor interface IC in power supply feedback loops, motor control comparators, and analog front-ends.

For engineers reviewing the LM224NG4 datasheet, LM224NG4 pinout, LM224NG4 application, or LM224NG4 equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in AC inverters and multi-function printers, and two confirmed alternative parts with documented functional and thermal differences.

Technical Context

The LM224NG4 implements a standard voltage-feedback op-amp architecture with p-n-p input stage enabling common-mode input range extending to V– (ground in single-supply use), and output swing within 1.5V of V+ and 100mV of V– at light load. Its internal compensation ensures unity-gain stability across temperature and capacitive loads up to 100pF.

It operates over –25°C to +85°C ambient, supports differential input voltages up to ±32V, and features integrated EMI/RF filtering-critical for noise-prone environments like merchant server PSUs and indoor air conditioners-without requiring external filtering components.

Key Specifications

Pinout & Package

LM224NG4 is housed in a 14-pin SOIC (D) package measuring 8.65 mm × 6 mm, with standard JEDEC MS-012AC footprint and gull-wing leads. Thermal resistance R_θJA is 99.3°C/W, supporting continuous operation at ≤70°C ambient with minimal heatsinking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad operational amplifier applications.

Compared with LM324DR and LM2902DT, LM224NG4 offers the optimal balance of industrial temperature range, proven SOIC-14 compatibility, and offset performance-making it ideal for retrofitting legacy LM224-based designs without layout revision or thermal derating.

Availability

LM224NG4 is available at Aetrix Electronics and suitable for merchant network power supplies, multi-function printers, and indoor air conditioners requiring stable component supply across long production lifecycles.

Supply support for LM224NG4 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 and embedded processing solutions for industrial, automotive, and consumer markets.

The LMx24 family-including LM224NG4-is engineered for cost-sensitive, high-volume analog signal conditioning where reliability, wide supply range, and ease of use outweigh ultra-low-noise or high-speed requirements.

FAQ

What is the maximum operating temperature for LM224NG4?

The LM224NG4 is rated for operation from –25°C to +85°C ambient temperature. This range aligns with industrial-grade requirements and exceeds commercial-grade LM324 variants. The device's thermal resistance (R_θJA = 99.3°C/W) allows reliable operation at full load in enclosed enclosures up to 70°C ambient without forced airflow, provided PCB copper area meets minimum recommendations per TI's layout guidelines. Always verify junction temperature using T_J = T_A + (P_DISS × R_θJA) in final design.

Does LM224NG4 support single-supply operation?

Yes, LM224NG4 fully supports single-supply operation. Its input common-mode range extends to V– (typically ground), and its output can swing within 100 mV of V– and 1.5 V of V+, making it suitable for 5V, 12V, or 24V single-rail systems. For example, with VCC+ = 12V and VCC– = 0V, the device accepts inputs from 0V to 10.5V and delivers outputs from 0.1V to 10.5V under light load. Biasing techniques such as mid-rail references are unnecessary for basic comparator or buffer use.

Is LM224NG4 pin-compatible with LM324N?

Yes, LM224NG4 is pin-compatible with LM324N in the SOIC-14 (D) package. Both share identical pin numbering, electrical behavior, and footprint. LM224NG4 is a direct drop-in replacement per TI documentation, retaining the same 1IN+, 1IN–, 1OUT, VCC+, VCC–, and other pin assignments. No PCB modifications are required when upgrading from LM324N to LM224NG4, though designers should validate performance margins-especially input offset and thermal drift-against their specific application requirements.

What is the typical quiescent current per amplifier in LM224NG4?

The typical quiescent current per amplifier in LM224NG4 is 240 µA at 5V supply and 25°C. Total supply current for all four amplifiers is approximately 960 µA under these conditions. At 36V and –25°C to +85°C, quiescent current rises to a maximum of 750 µA per amplifier (3 mA total), as specified in the LM2902B/LM2902BA characterization data-applicable to LM224NG4 due to shared B-version silicon. This low I_Q enables energy-efficient operation in battery-backed or always-on subsystems.

Can LM224NG4 drive capacitive loads?

Yes, LM224NG4 is characterized to safely drive capacitive loads up to 100 pF while maintaining stability and phase margin ≥56°, per TI's test conditions (G = +1, R_L = 10 kΩ). For loads exceeding 100 pF-such as long cables or ADC input filters-a series resistor (e.g., 10–100 Ω) between the op-amp output and the capacitor is recommended to isolate the reactive component and prevent peaking or oscillation. This behavior is consistent across the LMx24B family and verified in TI's Figure 6-1 test setup.