Texas Instruments LM224D

Overview

LM224D from Texas Instruments is a quadruple operational amplifier in SOIC-14 package, designed for cost-sensitive industrial and consumer applications. It features rail-to-rail input (common-mode range includes V–), 3V to 36V supply operation, ±3mV max input offset voltage at 25°C, 1.2MHz gain-bandwidth product, and 0.5V/μs slew rate - enabling precision signal conditioning in power supplies, motor controls, and sensor interfaces.

For engineers reviewing the LM224D datasheet, LM224D pinout, LM224D application, or LM224D equivalent, this page delivers verified electrical specs, validated SOIC-14 pin functions, real-world use cases in AC inverters and multi-function printers, and two confirmed drop-in alternatives with documented parameter trade-offs.

Technical Context

The LM224D implements four independent high-voltage op-amps in a single monolithic IC, each with unity-gain stability and common-mode input voltage extending to the negative rail. Its architecture supports single-supply operation down to 3V while maintaining 25V/mV minimum open-loop gain across –25°C to +85°C.

It uses bipolar input stages with low input bias current (≤50nA max over temperature), integrated EMI filtering, and robust output drive capability (±20mA source/sink). The device meets legacy LM224 specifications but is not part of the newer B-series (e.g., LM324B) - thus retains original offset, PSRR, and thermal performance profiles per TI SLOS066AE Rev. SEPTEMBER 2025.

Key Specifications

Pinout & Package

LM224D is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package measuring 8.65mm × 6mm, with standard JEDEC MS-012AC footprint and gull-wing leads. Thermal resistance R_θJA = 99.3°C/W enables operation up to +85°C ambient without forced cooling in typical PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM224D, LM324N offers identical functionality at lower cost but sacrifices industrial temperature capability, while LM2902DR extends thermal range and input impedance at the expense of initial offset accuracy - making LM224D the optimal balance for general-purpose industrial analog signal conditioning.

Availability

LM224D is available at Aetrix Electronics and suitable for power supply monitoring, motor control feedback, and multi-function printer engine applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LM224D 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 specializing in analog and embedded processing technologies, with decades of heritage in precision op-amp design and broad industrial market presence.

The LMx24 family - including LM224D - was engineered for cost-sensitive, high-volume industrial and consumer systems requiring reliable quad op-amp functionality with wide supply range and rail-to-rail input capability.

FAQ

What is the maximum operating temperature for LM224D?

The LM224D is specified for operation from –25°C to +85°C ambient temperature, matching the LM224xx series qualification per TI SLOS066AE. This makes it suitable for indoor industrial equipment, office electronics, and consumer appliances - but not for under-hood automotive or high-temperature factory-floor deployments where LM2902 variants would be preferred. The device's thermal resistance (R_θJA = 99.3°C/W) ensures safe junction temperatures below 150°C under typical PCB copper pour conditions.

Does LM224D support single-supply operation?

Yes, LM224D fully supports single-supply operation with its common-mode input voltage range extending to V– (ground), and output swing within 100mV of V– and 1.35V of VCC+. This allows direct interfacing with unipolar sensors, microcontroller ADC references, and digital logic thresholds without level-shifting circuitry. For example, with VCC = 5V and V– = 0V, the input can accept 0V–3.5V signals and output can drive 0.1V–3.65V - ideal for 3.3V/5V system integration.

What is the input offset voltage specification for LM224D?

The LM224D has a maximum input offset voltage of ±3mV at 25°C and ±7mV over its full operating temperature range (–25°C to +85°C), per TI SLOS066AE Section 6.7. This value is measured under open-loop conditions with VCC = 5V to 26V and VIC = VICRmin. Unlike the B-series (e.g., LM324B), LM224D does not include enhanced trimming - so designs requiring sub-millivolt DC accuracy must include external nulling or calibration routines.

Is LM224D pin-compatible with LM324 or LM2902?

Yes, LM224D is fully pin-compatible with LM324, LM2902, and all their SOIC-14 variants (e.g., LM324N, LM2902DR) - sharing identical 14-pin SOIC footprint, pin numbering, and functional assignment per TI's Pin Configuration and Functions table (Figure 5-1). However, absolute maximum ratings differ slightly: LM224D and LM324 tolerate up to 32V supply, while LM2902 is limited to 26V. Always verify supply voltage compliance before substitution.

What is the recommended decoupling for LM224D?

Texas Instruments recommends a 0.1µF ceramic capacitor placed as close as possible to the VCC+ (Pin 4) and VCC– (Pin 11) pins of LM224D, with short traces to minimize inductance. For systems with noisy power rails - such as switch-mode power supplies or motor drivers - adding a 10µF tantalum or aluminum electrolytic capacitor in parallel improves low-frequency ripple rejection. Ground plane integrity beneath the SOIC-14 body further enhances EMI immunity, especially given LM224D's integrated RF filtering.