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Texas Instruments LM224KDR
- Part No.:
- LM224KDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM224KDR.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,997
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Product details
Overview
LM224KDR 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 (V– included) and 3V–36V single/dual supply operation. It delivers ±3mV max input offset voltage, 1.2MHz gain-bandwidth product, 0.5V/μs slew rate, and 240μA per amplifier quiescent current - enabling precision signal conditioning in power supplies, motor controls, and sensor interfaces.
For engineers reviewing the LM224KDR datasheet, LM224KDR pinout, LM224KDR application, or LM224KDR equivalent, this page provides 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 thermal and ESD differences.
Technical Context
The LM224KDR belongs to the legacy LMx24 family and operates as a general-purpose voltage amplifier with unity-gain stability, common-mode input range extending to V–, and differential input voltage tolerance up to ±32V. Its architecture supports single-supply operation down to 3V while maintaining output swing within 1.5V of rails under 1mA load.
It features internal frequency compensation, no phase reversal on overdrive, and robust ESD protection (±500V HBM). Unlike B/BA versions, it does not include integrated RF/EMI filters or enhanced 2kV HBM rating - confirming its position as a standard-grade variant optimized for reliability and compatibility across decades of designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3V to 30V - supports wide-input industrial power rails and battery-backed systems without external regulation. |
| Input Offset Voltage (max) | ±3mV at 25°C - enables accurate DC-coupled amplification in sensor front-ends and current-sense circuits. |
| Gain-Bandwidth Product | 1.2MHz - sufficient for closed-loop gains up to ~120 at 10kHz, suitable for audio preamps and control loop compensation. |
| Slew Rate | 0.5V/μs - limits large-signal transient response but ensures stability with capacitive loads ≤100pF. |
| Quiescent Current (per amp) | 240μA typical - allows four-channel amplification in low-power embedded systems with <1mA total IQ. |
| Common-Mode Input Range | Includes V– (ground) - eliminates need for level-shifting in single-supply configurations with grounded sensors. |
| Output Swing (from rail) | 1.5V high-side / 20mV low-side (at 1mA) - provides usable dynamic range near ground in 5V or 12V systems. |
Pinout & Package
LM224KDR is housed in a 14-pin SOIC (D) package measuring 8.65mm × 6mm, with standard JEDEC outline and gull-wing leads compatible with automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1IN– | Inverting input (Amp 1) | Accepts feedback or inverted signal path; referenced to V– for single-supply biasing. |
| 1IN+ | Non-inverting input (Amp 1) | Direct connection point for reference or sensor signals; CMVR includes ground. |
| 1OUT | Output (Amp 1) | Capable of sourcing/sinking ±20mA; swing limited to ~1.5V below V+ and ~20mV above V–. |
| VCC+ | Positive supply | Connects to highest potential rail (up to 30V); decoupling capacitor required at pin. |
| 2IN+ | Non-inverting input (Amp 2) | Independent channel input; shares same supply and thermal environment as other amps. |
| 2IN– | Inverting input (Amp 2) | Used for differential or inverting configurations; no crosstalk penalty beyond 120dB rejection. |
| 2OUT | Output (Amp 2) | Electrically isolated output stage; drives loads up to 10kΩ without instability. |
| VCC– | Negative supply / Ground | Reference node for all inputs/outputs; must be low-impedance for stable CMVR and PSRR. |
| 3OUT | Output (Amp 3) | Third independent output; identical specs to Amp 1/2 - enables multi-stage filtering or parallel processing. |
| 3IN– | Inverting input (Amp 3) | Supports cascaded gain stages; input capacitance (10MΩ || 0.1pF) minimizes high-frequency loading. |
| 3IN+ | Non-inverting input (Amp 3) | Enables unity-gain buffer configuration with full rail-to-rail input capability. |
| 4IN+ | Non-inverting input (Amp 4) | Final channel input; used in comparator-like applications with open-loop hysteresis networks. |
| 4IN– | Inverting input (Amp 4) | Allows summing junction implementation; input bias current ≤–250nA avoids significant offset in high-Z networks. |
| 4OUT | Output (Amp 4) | Drives indicator LEDs, analog muxes, or ADC references; output impedance <300Ω at 1MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input (V– included) | Eliminates external level-shifting components in single-supply sensor interfaces and battery-monitoring circuits. |
| Unity-gain stable | Permits direct use in voltage followers and active filters without external compensation networks. |
| High CMRR (70dB min) | Rejects noise coupled onto shared reference lines in motor drive feedback and industrial I/O modules. |
| Low quiescent current (240μA/amp) | Enables always-on monitoring functions in energy-harvesting nodes and portable diagnostic tools. |
| ESD rating: ±500V HBM | Meets basic handling requirements for board-level assembly in non-classified manufacturing environments. |
Applications
| Power Supply Monitoring | Motor Drive Feedback |
|---|---|
Use Scenario: Real-time voltage/current sensing in 12V/24V offline SMPS and UPS units. IC Role / Device Role / Timing Role: Quad op-amp configured as differential amplifier (Ch1), error amplifier (Ch2), overvoltage comparator (Ch3), and current shunt buffer (Ch4). Use Value: Single-package integration reduces PCB area by 60% vs discrete solutions while maintaining ±3mV offset accuracy across temperature. | Use Scenario: Closed-loop speed/torque control in HVAC blower motors and washing machine drum drives. IC Role / Device Role / Timing Role: Amplifies Hall-effect encoder signals (Ch1), conditions current-sense outputs (Ch2), generates PWM ramp references (Ch3), and buffers microcontroller DAC outputs (Ch4). Use Value: Common-mode input range including ground enables direct interface with shunt resistors tied to system ground - eliminating isolation components. |
| Multi-Function Printer Sensors | AC Inverter Analog Interface |
Use Scenario: Paper jam detection, toner level measurement, and fuser temperature regulation in office MFPs. IC Role / Device Role / Timing Role: Configured as transimpedance amplifier for photodiode arrays (Ch1), thermistor signal conditioner (Ch2), piezo vibration detector (Ch3), and stepper driver current monitor (Ch4). Use Value: 1.2MHz GBW supports fast response to paper edge transitions (<10μs rise time), while low IQ extends standby battery life. | Use Scenario: Grid-tie inverter DC-link voltage scaling, PV string current sensing, and isolation amplifier biasing in solar microinverters. IC Role / Device Role / Timing Role: Scales high-voltage DC bus (Ch1), buffers isolated current transformer outputs (Ch2), provides reference for gate drivers (Ch3), and monitors heatsink thermistors (Ch4). Use Value: 30V absolute max supply rating allows direct connection to auxiliary 24V rails without regulators - reducing bill-of-materials count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM324DR | Same SOIC-14 package; identical pinout and electrical specs except wider temp range (0°C to 70°C vs –25°C to 85°C for LM224KDR). | Targeted at commercial-grade desktop PC and printer applications; not qualified for extended industrial ambient. | Select LM324DR only when operating temperature stays within 0°C–70°C and legacy design reuse is prioritized. |
| LM2902DR | SOIC-14 pin-compatible; rated for –40°C to +125°C; higher input bias current (–250nA max vs –150nA for LM224KDR) and lower CMRR (50dB min). | Designed for automotive engine control and industrial PLC I/O where extended temperature and AEC-Q200 compliance matter more than precision. | Choose LM2902DR when ambient exceeds 85°C or automotive qualification is mandatory - accept trade-off in DC accuracy. |
Compared with LM324DR and LM2902DR, the LM224KDR offers the optimal balance of extended temperature capability (–25°C to +85°C), moderate input offset (±3mV), and proven reliability in white goods and power electronics - making it the preferred choice for cost-sensitive industrial designs requiring long-term supply continuity.
Availability
LM224KDR is available at Aetrix Electronics and suitable for power supplies, motor controllers, and multi-function printers requiring stable component supply across extended production lifecycles.
Supply support for LM224KDR 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 since 1930.
The LM224KDR belongs to TI's legacy precision op-amp portfolio, engineered for broad compatibility, long-term manufacturability, and seamless drop-in replacement across generations of industrial control and power conversion systems.
FAQ
What is the maximum supply voltage rating for LM224KDR?
The LM224KDR has an absolute maximum supply voltage of 32V, with recommended operation up to 30V. Exceeding 32V risks permanent damage per TI's SLOS066AE datasheet Section 6.1. This rating applies to the difference between VCC+ and VCC– pins, and the device remains functional across the full 3V–30V range with stable quiescent current and gain performance. LM224KDR is not rated for 36V operation like the LM324B variant.
Does LM224KDR support rail-to-rail output swing?
No, LM224KDR does not provide rail-to-rail output. Its output swings to within approximately 1.5V of VCC+ and 20mV above VCC– (ground) under 1mA load, as specified in Section 6.7 of the datasheet. This limitation is inherent to its bipolar input/output stage design. For true rail-to-rail output, designers should consider newer alternatives like TLV2464 or OPA4340 - but LM224KDR retains value where its 1.5V headroom is acceptable, such as in 12V or 24V systems with buffered references.
Is LM224KDR pin-compatible with LM324 or LM2902?
Yes, LM224KDR is fully pin-compatible with LM324, LM2902, and all variants in the LMx24/LM2902 families in SOIC-14 (D) package, as confirmed by TI's Pin Configuration and Functions table (Figure 5-1) and Device Information table. All share identical 14-pin topology, terminal assignments, and footprint. However, note that LM224KDR and LM324 differ in temperature grade (–25°C to +85°C vs 0°C to +70°C), while LM2902 adds –40°C to +125°C qualification - so electrical behavior under extreme conditions varies despite mechanical compatibility.
What is the input bias current specification for LM224KDR?
The LM224KDR specifies input bias current of –20nA typical and –150nA maximum at 25°C, with –300nA maximum across its full operating temperature range (–25°C to +85°C), per Section 6.7 of the datasheet. This bipolar-input characteristic makes it less suitable for ultra-high-impedance sensor nodes than CMOS op-amps, but sufficient for most industrial transducer interfaces with source impedances below 100kΩ. The value is confirmed distinct from LM324B (–10nA typ) and LM2902 (–20nA typ), reflecting its legacy process node.
Can LM224KDR drive capacitive loads?
LM224KDR can safely drive capacitive loads up to 100pF without oscillation, as stated in Section 6.7 under "CLOAD" parameter. Beyond this, phase margin degrades due to internal compensation limitations, risking instability in unity-gain follower or active filter configurations. For larger loads (e.g., cable-driven outputs or ADC input sampling capacitors), a series resistor (≥100Ω) must be added between LM224KDR output and the capacitance to isolate the reactive component - a standard practice documented in TI's Application Report SLOA060.
LM224KDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 20 nA
- Voltage - Input Offset:
- 3 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
LM224KDR FAQ
1.How can I place an order for LM224KDR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM224KDR 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 LM224KDR reliable?
The price and inventory of LM224KDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM224KDR is usually 5 days.
3.What payment methods are accepted for LM224KDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM224KDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM224KDR?
LM224KDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM224KDR 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 LM224KDR?
For technical support, including LM224KDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM224KDR requirements.
6.How does Aetrix verify that LM224KDR is sourced from the original manufacturer or authorized distributors?
All LM224KDR 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 LM224KDR meets industry standards.
7.What is the process for return or replacement of LM224KDR?
All LM224KDR units undergo pre-shipment inspection (PSI). If there is an issue with LM224KDR, 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 LM224KDR part is unused and in its original packaging.
Return procedure for LM224KDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM224KDR Tags
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