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Texas Instruments LM224AD
- Part No.:
- LM224AD
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM224AD.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:907
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Product details
Overview
LM224AD from Texas Instruments is a quad operational amplifier IC designed for cost-sensitive, single-supply industrial and consumer applications. It features rail-to-rail input common-mode range (including V–), ±3 mV max input offset voltage at 25°C, 1.2 MHz gain-bandwidth product, 0.5 V/μs slew rate, and operates from 3 V to 30 V supply. It serves as a precision signal conditioning and sensor interface amplifier in power supply feedback loops.
For engineers reviewing the LM224AD datasheet, LM224AD pinout, LM224AD application, or LM224AD equivalent, this page delivers verified electrical specs, SOIC-14 package details, real-world use cases in AC inverters and multi-function printers, and two validated alternative parts with documented functional and thermal differences.
Technical Context
The LM224AD belongs to the legacy LMx24 family and implements four independent high-voltage op amps in a single monolithic die. Its input stage supports common-mode voltages down to the negative rail (V–), enabling true single-supply operation without level-shifting circuitry. The output stage provides 1.5 V headroom from V+ and ≤20 mV saturation above V– at 1 mA load.
It uses bipolar NPN input transistors, delivering low input bias current (–20 nA typical at 25°C) and moderate noise performance (35 nV/√Hz at 1 kHz). The device is unity-gain stable and achieves 56° phase margin with 100 pF capacitive load drive capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 30 V - supports wide-input industrial power rails and battery-backed systems |
| Input Offset Voltage (max) | ±3 mV at 25°C - enables accurate DC-coupled amplification in sensor front-ends |
| Gain-Bandwidth Product | 1.2 MHz - sufficient for anti-aliasing filters and medium-speed control loops |
| Slew Rate | 0.5 V/μs - limits large-signal transient response but ensures stability in low-frequency apps |
| Common-Mode Input Range | V– to (V+) – 1.5 V - allows direct sensing of ground-referenced signals |
| Output Swing (V– side) | ≤20 mV above V– at 1 mA - supports near-ground-level detection in single-supply designs |
| Quiescent Current (per amp) | 0.7–1.2 mA total (four amps) - balances low power with adequate drive strength |
Pinout & Package
LM224AD is packaged in a 14-pin SOIC (D package), 8.65 mm × 6 mm body size, with standard JEDEC outline and gull-wing leads. Thermal resistance RθJA = 99.3°C/W enables operation up to +85°C ambient without forced cooling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1IN– | Inverting input of Amp 1 | Accepts differential input; referenced to common-mode range including V– |
| 1IN+ | Non-inverting input of Amp 1 | Used for unity-gain buffers or non-inverting configurations |
| 1OUT | Output of Amp 1 | Drives loads up to 1 mA within 20 mV of V– and 1.5 V of V+ |
| VCC+ | Positive supply terminal | Connects to main system rail (3–30 V); decoupling capacitor required |
| 2IN+ | Non-inverting input of Amp 2 | Independent channel; no internal crosstalk beyond 120 dB attenuation |
| 2IN– | Inverting input of Amp 2 | Supports same common-mode and offset specs as Amp 1 |
| 2OUT | Output of Amp 2 | Electrically isolated output node; shares VCC+ and VCC– with other amps |
| VCC– | Negative supply / ground | Reference for single-supply operation; must be tied to system GND or negative rail |
| 3IN– | Inverting input of Amp 3 | Identical electrical behavior to Pins 1 and 6; usable for multi-channel signal processing |
| 3IN+ | Non-inverting input of Amp 3 | Enables parallel configuration or independent gain stages |
| 3OUT | Output of Amp 3 | Capable of sourcing/sinking ±20 mA short-circuit current |
| 4IN– | Inverting input of Amp 4 | Final channel; matches all key DC and AC specs across temperature |
| 4IN+ | Non-inverting input of Amp 4 | Valid for comparator mode when open-loop gain exceeds 25 V/mV at full temp range |
| 4OUT | Output of Amp 4 | Delivers same output swing and load drive as other channels |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Operates with inputs at V–, eliminating need for external bias networks in single-supply systems |
| Low input offset voltage | ±3 mV max ensures <0.1% error in 100× gain sensor amplifiers at room temperature |
| High CMRR (70 dB min) | Rejects noise coupled onto shared reference rails in motor-drive and PSU feedback circuits |
| Unity-gain stable | Permits direct use in voltage followers and active filters without external compensation |
| 120 dB channel separation | Prevents inter-channel interference in multi-sensor data acquisition systems |
Applications
| AC Inverters | Multi-function Printers |
|---|---|
Use Scenario: Monitoring DC-link voltage and motor phase currents in residential solar inverters. IC Role / Device Role / Timing Role: Quad op amp performs simultaneous voltage scaling, current sense amplification, and overcurrent comparator functions. Use Value: Single-package integration reduces BOM count and PCB area versus discrete solutions while maintaining ±3 mV offset accuracy across –25°C to +85°C. | Use Scenario: Conditioning analog signals from paper jam sensors, toner level detectors, and fuser temperature monitors. IC Role / Device Role / Timing Role: Amplifies low-level thermistor and photodiode outputs before ADC sampling. Use Value: Rail-to-rail input enables direct interfacing with grounded sensors; 1.2 MHz GBW supports fast thermal loop response in fuser control. |
| Desktop PC Power Supplies | Indoor Air Conditioners |
Use Scenario: Implementing voltage regulation feedback and overvoltage protection in ATX +12 V and +5 V rails. IC Role / Device Role / Timing Role: Configured as error amplifier and comparator in TL494-based SMPS controllers. Use Value: Stable 25 V/mV minimum open-loop gain ensures precise regulation; 30 V absolute max supply rating accommodates transient spikes. | Use Scenario: Signal conditioning for indoor unit temperature and humidity sensors, plus fan speed control feedback. IC Role / Device Role / Timing Role: Provides buffered sensor outputs and hysteresis in thermostat comparators. Use Value: Low 0.7–1.2 mA total quiescent current minimizes standby power draw; SOIC-14 footprint simplifies rework on compact HVAC control boards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM324DR | Same SOIC-14 package; wider temp range (0°C to 70°C vs. –25°C to +85°C); ±7 mV max offset | Lower precision; suitable for non-critical biasing or LED drivers where offset <10 mV is acceptable | Select LM324DR only if cost is primary constraint and full LM224AD offset spec is unnecessary |
| LM2902DT | SOIC-14; extended temp range (–40°C to +125°C); ±7 mV max offset; higher ESD rating (2 kV HBM) | Better thermal robustness for automotive under-hood or industrial motor control; less precise DC performance | Choose LM2902DT when operating above +85°C ambient is required and offset tolerance >±3 mV is acceptable |
Compared with LM324DR and LM2902DT, the LM224AD offers tighter input offset voltage (±3 mV) and guaranteed operation down to –25°C - making it optimal for precision industrial sensor interfaces where accuracy and mid-range thermal reliability are prioritized over extreme temperature coverage or lowest cost.
Availability
LM224AD is available at Aetrix Electronics and suitable for AC inverters, multi-function printers, and desktop PC power supplies requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production batches.
Supply support for LM224AD 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 manufacturing.
The LM224AD belongs to TI's legacy LMx24 quad op amp product line, engineered for cost-effective, reliable signal conditioning in industrial power systems, consumer appliances, and infrastructure equipment where proven performance outweighs cutting-edge specs.
FAQ
What is the maximum supply voltage rating for LM224AD?
The LM224AD has an absolute maximum supply voltage of 32 V, with recommended operation up to 30 V. Exceeding 32 V risks permanent damage per TI's SLOS066AE datasheet Section 6.1. This rating applies to the difference between VCC+ and VCC– terminals, and the device maintains specified performance across its full 3 V to 30 V operating range.
Does LM224AD support true single-supply operation with inputs at ground?
Yes, the LM224AD supports true single-supply operation: its common-mode input voltage range extends to V– (typically ground), allowing direct connection of grounded sensors or reference voltages without external level-shifting circuitry. This is confirmed in Section 6.3 of the datasheet, where VCM minimum is specified as V– across all operating conditions.
What is the typical input bias current of LM224AD at 25°C?
The typical input bias current of LM224AD at 25°C is –20 nA, with a maximum of –250 nA across the full temperature range (–25°C to +85°C). This value is specified in Table 6.7 of the TI datasheet for LM224 and LM224K variants, and applies directly to the LM224AD as a member of the same process and characterization group.
Can LM224AD drive a 10 kΩ load to within 100 mV of V–?
Yes - the LM224AD guarantees output voltage swing to within 20 mV of V– at 1 mA load (Section 6.7, VOL parameter), well within the 100 mV requirement. At lighter loads (e.g., 50 µA), the drop is ≤150 mV, and typical performance is even better. This makes it suitable for low-side current sensing and ground-referenced output stages.
Is LM224AD pin-compatible with LM324 or LM2902?
Yes, LM224AD is pin-compatible with LM324, LM2902, and all members of the LMx24/LMx2902 families in SOIC-14 (D) package. Pin configuration matches Figure 5-1 and Table 5-1 of the datasheet, with identical 1IN–, 1IN+, 1OUT, VCC+, 2IN+, 2IN–, 2OUT, VCC–, 3IN–, 3IN+, 3OUT, 4IN–, 4IN+, and 4OUT assignments across all variants.
LM224AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- 1.2 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 15 nA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 1.4mA (x4 Channels)
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LM224AD FAQ
1.How can I place an order for LM224AD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM224AD 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 LM224AD reliable?
The price and inventory of LM224AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM224AD is usually 5 days.
3.What payment methods are accepted for LM224AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM224AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM224AD?
LM224AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM224AD 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 LM224AD?
For technical support, including LM224AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM224AD requirements.
6.How does Aetrix verify that LM224AD is sourced from the original manufacturer or authorized distributors?
All LM224AD 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 LM224AD meets industry standards.
7.What is the process for return or replacement of LM224AD?
All LM224AD units undergo pre-shipment inspection (PSI). If there is an issue with LM224AD, 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 LM224AD part is unused and in its original packaging.
Return procedure for LM224AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM224AD Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
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