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STMicroelectronics LM224QT
- Part No.:
- LM224QT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
LM224QT.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:88,793
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Product details
Overview
LM224QT from STMicroelectronics is a quad low-power operational amplifier in QFN16 3×3 package, designed for single-supply operation from 3 V to 30 V (or ±1.5 V to ±15 V). It delivers 1.3 MHz gain bandwidth, 100 dB large-signal voltage gain, and rail-to-rail input common-mode range including ground-enabling precision signal conditioning in industrial sensor interfaces and battery-powered instrumentation.
For engineers reviewing the LM224QT datasheet, LM224QT pinout, LM224QT application, or LM224QT equivalent, key selection criteria include its 375 µA/amplifier supply current, 20 nA input bias current, 3 mV max input offset voltage (LM224A-grade), 0.4 V/µs slew rate, and QFN16 thermal resistance of 45 °C/W-critical for compact, thermally constrained designs.
Technical Context
The LM224QT integrates four independent, internally frequency-compensated op-amps with PNP input stage architecture, enabling input common-mode voltage down to ground and high CMRR (70–80 dB) across temperature. Its output stage supports ±40 mA short-circuit current with rail-to-rail sourcing/sinking capability under load.
Designed for robust single-supply operation, it features ESD protection (800 V HBM), operates over –40 °C to +105 °C, and maintains stable performance across 3 V–30 V supply range-no external compensation required for unity-gain stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain bandwidth product | 1.3 MHz - enables stable unity-gain buffer or 10× inverting amplifier up to ~130 kHz |
| Input offset voltage (max) | 3 mV at 25 °C - limits DC error to ≤3 mV in precision DC amplifiers without trimming |
| Supply current per amplifier | 375 µA - allows four-channel operation at <1.5 mA total, ideal for low-power portable systems |
| Input bias current | 20 nA - minimizes voltage error across high-impedance sensor sources (e.g., pH electrodes) |
| Common-mode input range | 0 V to (VCC – 1.5 V) - supports direct sensing of ground-referenced signals without level-shifting |
| Slew rate | 0.4 V/µs - sufficient for audio-band (<20 kHz) signal conditioning and slow control loops |
| Output current (sink/source) | ±40 mA - drives 75 Ω loads or multiple logic inputs directly without external buffers |
Pinout & Package
LM224QT uses a 3 mm × 3 mm QFN16 package with exposed thermal pad (connected to VCC− or left floating per design). Pin 1 is marked by dot; top view orientation follows standard QFN numbering (counter-clockwise from top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting input (Amp 1) | High-impedance node for feedback network connection; accepts signals down to ground |
| 2 | Output (Amp 1) | Capable of sourcing/sinking ±40 mA; requires local decoupling near pin for stability |
| 3 | Non-inverting input (Amp 1) | DC-coupled input path; common-mode range includes ground for single-supply sensor interfacing |
| 4 | VCC− (GND) | Power return reference; exposed pad must be soldered for thermal performance (RthJA = 45 °C/W) |
| 5 | Inverting input (Amp 2) | Independent channel input; no crosstalk above 120 kHz (channel separation >120 dB) |
| 6 | Output (Amp 2) | Electrically isolated output; shares same supply rails but no internal coupling to other channels |
| 7 | Non-inverting input (Amp 2) | Matches Amp 1 input specs; usable for differential pair configurations with matched external resistors |
| 8 | VCC+ | Positive supply rail; supports 3–30 V single supply or ±1.5–±15 V dual supply operation |
| 9 | Inverting input (Amp 3) | Third independent amplifier input; identical AC/DC specs to Amps 1 & 2 |
| 10 | Output (Amp 3) | Drives loads up to 2 kΩ at full swing; output voltage swing limited to ~1.5 V from rails |
| 11 | Non-inverting input (Amp 3) | Enables high-Z summing or instrumentation front-end use with minimal input current error |
| 12 | Inverting input (Amp 4) | Fourth channel input; validated for simultaneous operation with all amps active at full spec |
| 13 | Output (Amp 4) | Final output stage; thermal derating applies if all four outputs drive heavy loads concurrently |
| 14 | Non-inverting input (Amp 4) | Supports DC-coupled transducer signal conditioning with <20 nA input bias current |
| 15–16 | Exposed thermal pad | Connected to VCC− internally; PCB land pattern must match DS0985 footprint for optimal thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range including ground | Enables direct interface with 0 V–reference sensors (e.g., thermocouples, strain gauges) without level shifters |
| Low quiescent current (375 µA/amplifier) | Permits four-channel analog signal processing in battery-operated devices with >1-year runtime on coin cell |
| Enhanced ESD rating (800 V HBM) | Reduces field failure risk during handling and board assembly in uncontrolled environments |
| Wide supply range (3–30 V single / ±1.5–±15 V dual) | Eliminates need for separate LDOs in mixed-voltage systems (e.g., 5 V MCU + 24 V industrial I/O) |
| Internal frequency compensation | Guarantees stability with unity-gain configuration; no external capacitor required for basic buffering |
Applications
| Industrial Sensor Signal Conditioning | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Amplifying low-level mV outputs from RTD, thermocouple, or pressure transducers in PLC analog input modules. IC Role / Device Role / Timing Role: Quad op-amp performs simultaneous gain, filtering, and level-shifting for four independent sensor channels. Use Value: Input common-mode range including ground eliminates external bias networks; 3 mV Vio ensures <0.1% error in 30 mV full-scale measurements. |
Use Scenario: Front-end amplification and anti-alias filtering in handheld ECG or pulse oximeter units powered by Li-ion batteries. IC Role / Device Role / Timing Role: Configured as instrumentation amplifier and active filter to condition biopotential signals before ADC sampling. Use Value: 375 µA/amplifier current enables >24-hour continuous monitoring on 200 mAh battery; low noise (40 nV/√Hz) preserves SNR. |
| Automotive Cabin Environment Monitoring | Smart Home HVAC Control |
|
Use Scenario: Processing cabin temperature, humidity, and CO₂ sensor outputs in automotive climate control ECUs. IC Role / Device Role / Timing Role: Four independent amplifiers condition each sensor's analog output prior to multiplexed ADC conversion. Use Value: –40 °C to +105 °C operating range meets AEC-Q100 Grade 3 requirements; 800 V HBM withstands assembly ESD events. |
Use Scenario: Signal conditioning for NTC thermistors, capacitive humidity sensors, and airflow transducers in Wi-Fi thermostats. IC Role / Device Role / Timing Role: Provides programmable gain, offset correction, and low-pass filtering for multi-sensor fusion algorithms. Use Value: Single 3.3 V or 5 V supply simplifies power architecture; 100 dB open-loop gain ensures <0.01% linearity error in closed-loop configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM224APT | TSSOP14 package; RthJA = 100 °C/W vs. QFN16's 45 °C/W; same electrical specs and temp range | Preferred for through-hole prototyping or legacy PCB layouts; less suitable for space-constrained thermal designs | Select when board real estate permits larger footprint and thermal management relies on copper area rather than package efficiency |
| TSB572IDT | 36 V supply range; 0.15 mV Vio; 1.8 MHz GBP; 1.1 mA total supply current; automotive-qualified (AEC-Q100 Grade 1) | Targeted at high-accuracy, high-voltage industrial automation where LM224QT's 3 mV Vio is insufficient | Choose when system requires <0.05% DC accuracy, >24 V operation, or automotive qualification-accepting higher power and cost |
Compared with LM224APT, LM224QT offers superior thermal performance in dense layouts; compared with TSB572IDT, it trades precision and voltage headroom for lower cost and power-making it optimal for cost-sensitive, thermally constrained industrial and portable applications.
Availability
LM224QT is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable medical instrumentation, and smart home HVAC control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM224QT 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, specializing in microcontrollers, power management, analog ICs, and MEMS sensors-with over 40 years of op-amp design heritage.
The LM224x series belongs to ST's general-purpose precision op-amp product line, engineered specifically for reliable single-supply operation in industrial, medical, and consumer equipment where low power, wide voltage range, and ground-sensing capability are essential.
FAQ
What is the maximum operating junction temperature for LM224QT?
The absolute maximum junction temperature is 150 °C. With RthJA = 45 °C/W and typical power dissipation of 1.5 mW per amplifier (6 mW total), ambient temperature must remain below 123 °C to stay within limit-achievable via proper PCB copper pour under the exposed pad.
Can LM224QT drive a 10 kΩ load with rail-to-rail output swing?
Yes: at VCC = 5 V, LM224QT delivers high-level output voltage ≥3.5 V and low-level output ≤20 mV into 10 kΩ, achieving >95% of rail-to-rail swing. Output swing degrades slightly at heavier loads (e.g., 2 kΩ), where VOL rises to ~50 mV and VOH drops to ~4.7 V.
Is the exposed thermal pad of LM224QT electrically connected?
Yes-the exposed pad is internally connected to VCC− (pin 4). ST recommends soldering it to a dedicated PCB ground plane or VCC− copper area using the footprint specified in DS0985 Figure 30 to achieve rated RthJA = 45 °C/W and prevent thermal runaway under sustained load.
Does LM224QT require external compensation for unity-gain stability?
No: internal frequency compensation ensures unconditional stability in unity-gain follower, inverting, and non-inverting configurations across the full operating temperature and supply range-no external capacitor or resistor network is needed for basic applications.
LM224QT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- 1.3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 nA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 1.5mA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LM224QT FAQ
1.How can I place an order for LM224QT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM224QT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM224QT reliable?
The price and inventory of LM224QT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM224QT is usually 5 days.
3.What payment methods are accepted for LM224QT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM224QT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM224QT?
LM224QT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM224QT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM224QT?
For technical support, including LM224QT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM224QT requirements.
6.How does Aetrix verify that LM224QT is sourced from the original manufacturer or authorized distributors?
All LM224QT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM224QT meets industry standards.
7.What is the process for return or replacement of LM224QT?
All LM224QT units undergo pre-shipment inspection (PSI). If there is an issue with LM224QT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM224QT part is unused and in its original packaging.
Return procedure for LM224QT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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