STMicroelectronics LM224PT

Overview

LM224PT from STMicroelectronics is a quad low-power operational amplifier in TSSOP-14 package, designed for single-supply operation from 3 V to 30 V or dual supplies (±1.5 V to ±15 V). It delivers 1.3 MHz gain bandwidth, 100 dB large-signal voltage gain, and input common-mode range extending to ground-enabling precision signal conditioning in battery-powered sensor interfaces and industrial analog front-ends.

For engineers reviewing the LM224PT datasheet, LM224PT pinout, LM224PT application, or LM224PT equivalent, key selection criteria include its 375 µA/amplifier supply current, 20 nA input bias current, 3 mV max input offset voltage (LM224A grade), rail-to-rail output swing capability, and thermal resistance of 100 °C/W in TSSOP14-critical for compact, thermally constrained designs.

Technical Context

The LM224PT implements internally frequency-compensated high-gain DC-coupled amplifiers with PNP input stages enabling ground-sensing operation. Its architecture supports unity-gain stable configurations and features independent amplifier channels with no crosstalk-induced degradation above 120 kHz.

It operates across –40 °C to +105 °C, meets 250 V HBM ESD rating, and sustains output short-circuit indefinitely at VCC ≤ 15 V. Input protection diodes clamp voltages beyond –0.3 V or VCC + 0.3 V, while output current sourcing/sinking is limited to ~40 mA per channel under typical conditions.

Key Specifications

Pinout & Package

TSSOP-14 (Thin Shrink Small Outline Package, 4.9 mm × 6.4 mm × 1.05 mm height) with exposed pad not connected internally; recommended for surface-mount assembly on 2-layer PCBs with thermal relief.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM224DT, LM224PT offers superior thermal performance and smaller PCB area; versus TSB572IDT, it trades lower power and tighter Vio for broader legacy compatibility and lower unit cost in non-automotive applications.

Availability

LM224PT is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable medical devices, and smart home safety systems requiring stable component supply across long production lifecycles.

Supply support for LM224PT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering silicon solutions for automotive, industrial, and consumer markets since 1987.

The LM224x series belongs to ST's general-purpose analog portfolio, engineered for cost-sensitive, thermally constrained applications where reliability across –40 °C to +105 °C and single-supply simplicity are essential design requirements.

FAQ

What is the maximum operating temperature for LM224PT?

The LM224PT is rated for operation from –40 °C to +105 °C, matching the LM224x temperature grade. This range is validated per Table 2 of DS0985 Rev 8 and applies to continuous operation with proper PCB thermal design-specifically, maintaining junction temperature ≤150 °C using the TSSOP14 thermal resistance of 100 °C/W.

Does LM224PT support rail-to-rail input or output?

LM224PT supports rail-to-rail *input* common-mode range down to ground (0 V), but its output swing is limited to within ~1.5 V of each rail under load. For example, with VCC = 5 V and GND, output ranges from ~1.5 V to ~3.5 V into 2 kΩ. True rail-to-rail output requires newer alternatives like TSB572.

Can LM224PT drive capacitive loads directly?

LM224PT is unity-gain stable but exhibits degraded phase margin with capacitive loads >100 pF. Driving cables or ADC input capacitance requires isolation via a series resistor (≥100 Ω) or a dedicated buffer stage. Figure 10 (open-loop frequency response) and Figure 11 (large-signal response) in DS0985 confirm stability limits under CL = 100 pF.

Is LM224PT pin-compatible with LM324PT?

Yes-LM224PT and LM324PT share identical TSSOP-14 pinouts and electrical behavior, differing only in temperature range (LM224PT: –40 °C to +105 °C; LM324PT: 0 °C to +70 °C) and default input offset voltage (LM224PT: 5 mV max; LM324PT: 7 mV max). No layout change is needed when upgrading from commercial to industrial grade.