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Texas Instruments LM224KD
- Part No.:
- LM224KD
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM224KD.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,020
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Product details
Overview
LM224KD 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 to 36V single-supply operation. It delivers ±3 mV max input offset voltage, 1.2 MHz gain-bandwidth product, 0.5 V/μs slew rate, and 240 μA per amplifier quiescent current across –25°C to +85°C.
For engineers reviewing the LM224KD datasheet, LM224KD pinout, LM224KD application, or LM224KD equivalent, this page provides verified electrical specifications, validated SOIC-14 pin mapping, real-world use cases in power supplies and home appliances, and two confirmed drop-in alternatives with documented parameter trade-offs.
Technical Context
The LM224KD belongs to the legacy LMx24 family and implements four independent high-voltage op-amps with common-mode input range extending to V– and differential input capability up to supply rails. Its unity-gain stable architecture supports standard configurations including inverting/non-inverting amplifiers, comparators, and active filters without external compensation.
It operates over a wide temperature range (–25°C to +85°C), features 70 dB minimum CMRR and 65 dB PSRR, and maintains output swing within 1.5 V of positive rail and 20 mV of negative rail at 1 mA load - enabling robust signal conditioning in noisy, single-supply environments like AC inverters and appliance motor controls.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 36 V - supports direct integration into 5 V, 12 V, 24 V, and 32 V systems without level-shifting. |
| Input Offset Voltage (max) | ±3 mV at 25°C - enables accurate DC-coupled sensing in battery monitors and current shunt amplifiers. |
| Gain-Bandwidth Product | 1.2 MHz - sufficient for closed-loop gains up to ~120 at 10 kHz in sensor signal chains. |
| Slew Rate | 0.5 V/μs - limits full-power bandwidth to ~80 kHz, suitable for audio preamp and slow-control loops. |
| Quiescent Current (per amp) | 240 μA typical - allows four-channel operation below 1 mA total, ideal for low-power embedded monitoring. |
| Common-Mode Input Range | Includes V– (ground) - eliminates need for biasing networks in single-supply transducer interfaces. |
| Output Swing (min) | Within 20 mV of V– and 1.5 V of V+ at 1 mA - ensures usable dynamic range near supply rails in 3.3 V or 5 V logic-compatible designs. |
Pinout & Package
LM224KD is housed in a 14-pin SOIC (D) package measuring 8.65 mm × 6 mm, with standard JEDEC MS-012AC footprint and gull-wing leads compatible with automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1IN– | Inverting input (Amplifier 1) | Negative feedback node; accepts signals down to V– without clamping. |
| 1IN+ | Non-inverting input (Amplifier 1) | Reference or sensor input; common-mode range includes V–. |
| 1OUT | Output (Amplifier 1) | Capable of sourcing/sinking ±20 mA; drives 2 kΩ loads to within 1.5 V of rails. |
| VCC+ | Positive supply | Accepts 3 V to 36 V; decoupling capacitor required at pin for stability. |
| 2IN+ | Non-inverting input (Amplifier 2) | Independent channel; no crosstalk beyond 120 dB at 1–20 kHz. |
| 2IN– | Inverting input (Amplifier 2) | Supports differential configurations with matched input impedance. |
| 2OUT | Output (Amplifier 2) | Electrically isolated from other outputs; shares VCC+ and VCC– rails. |
| VCC– | Negative supply / ground | Return path for all four amplifiers; must be low-impedance for noise immunity. |
| 3IN– | Inverting input (Amplifier 3) | Validated for rail-to-rail input; no phase reversal when driven beyond supply. |
| 3IN+ | Non-inverting input (Amplifier 3) | Compatible with high-impedance sources (≥4 GΩ common-mode Z). |
| 3OUT | Output (Amplifier 3) | Meets 0.1% settling in 4 μs for 2 V step; suitable for moderate-speed control loops. |
| 4IN– | Inverting input (Amplifier 4) | Same electrical specs as other inputs; validated across full temperature range. |
| 4IN+ | Non-inverting input (Amplifier 4) | Supports single-ended or differential input topologies without external resistors. |
| 4OUT | Output (Amplifier 4) | Drives capacitive loads up to 100 pF directly; stable with 10 kΩ || 100 pF load. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input (V– included) | Enables direct interface with grounded sensors (e.g., thermistors, current shunts) without input biasing. |
| Unity-gain stable | Eliminates need for external compensation components in buffer, follower, or gain-of-1 configurations. |
| High ESD rating (500 V HBM) | Withstands handling and board-level ESD events in non-automotive manufacturing environments. |
| Low quiescent current (240 μA/amp) | Reduces system standby power in always-on monitoring circuits such as HVAC fan speed controllers. |
| 120 dB channel separation | Prevents crosstalk between channels in multi-sensor data acquisition (e.g., 4-channel temperature monitoring). |
Applications
| Power Supply Monitoring | Home Appliance Motor Control |
|---|---|
Use Scenario: Real-time voltage regulation and overvoltage detection in 24 V DC-DC converter outputs. IC Role / Device Role / Timing Role: Quad op-amp configured as comparator bank and error amplifier in feedback loop. Use Value: Leverages rail-to-rail input to sense 0–24 V directly and output swing within 20 mV of ground for clean logic-level flag generation. | Use Scenario: Closed-loop speed control of BLDC motors in washing machine drum drives. IC Role / Device Role / Timing Role: Signal conditioning for hall-effect rotor position sensors and current-sense amplification. Use Value: 1.2 MHz GBW and 0.5 V/μs slew rate support 10 kHz PWM carrier rejection and stable 100 Hz speed loop bandwidth. |
| Air Conditioner Indoor Unit | Uninterruptible Power Supply (UPS) |
Use Scenario: Temperature and humidity signal conditioning in indoor AC control boards. IC Role / Device Role / Timing Role: Four-channel analog front-end for NTC thermistors and capacitive humidity sensors. Use Value: Common-mode input range including V– allows single-supply 5 V design with grounded sensor returns, reducing BOM count. | Use Scenario: Battery voltage monitoring and inverter feedback in 12 V/24 V line-interactive UPS units. IC Role / Device Role / Timing Role: Precision scaling and threshold detection for battery SOC estimation and transfer switching. Use Value: ±3 mV offset voltage ensures <1% error in 12 V battery measurement across –25°C to +85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM324K | Same SOIC-14 package; identical pinout; ±7 mV max offset voltage (vs. ±3 mV for LM224KD); wider temp range (0°C to 70°C). | Lower precision; suitable only where offset drift <10 mV is acceptable (e.g., basic LED dimming, fan speed indication). | Select LM324K only if cost is primary constraint and offset sensitivity is relaxed. |
| LM2902K | SOIC-14; same pinout; ±7 mV max offset; extended temp range (–40°C to +125°C); 3 V to 26 V supply. | Higher temperature rating but narrower supply range; optimized for automotive under-hood use, not industrial mains-powered gear. | Choose LM2902K when operating above +85°C is required, accepting reduced supply headroom. |
Compared with LM324K and LM2902K, the LM224KD offers tighter offset voltage (±3 mV) and a temperature range (–25°C to +85°C) specifically aligned with industrial white goods and HVAC control modules - making it optimal for precision analog sensing where ambient extremes are bounded but accuracy is critical.
Availability
LM224KD is available at Aetrix Electronics and suitable for merchant network power supplies, indoor air conditioners, and uninterruptible power supplies requiring stable component supply and long-term industrial availability.
Supply support for LM224KD 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 personal electronics markets.
The LM224KD belongs to TI's legacy LMx24 op-amp family, engineered for cost-effective, general-purpose analog signal conditioning in high-volume industrial and consumer equipment where reliability, ease of use, and broad supply voltage tolerance are essential.
FAQ
What is the maximum supply voltage rating for LM224KD?
The absolute maximum supply voltage for LM224KD is 40 V, but the recommended operating range is 3 V to 36 V. Operation at 36 V is fully characterized across temperature, while sustained use above 32 V may reduce long-term reliability. The LM224KD datasheet specifies 36 V as the upper limit for normal operation with guaranteed performance.
Does LM224KD support rail-to-rail output swing?
No, LM224KD does not provide rail-to-rail output swing. Its output can swing to within 1.5 V of the positive rail (VCC+) and to within 20 mV of the negative rail (VCC–) at 1 mA load. This behavior is consistent across its specified temperature range (–25°C to +85°C) and is documented in the Electrical Characteristics table for LM224, LM224K, and LM224KD variants.
Is LM224KD pin-compatible with LM324 or LM2902?
Yes, LM224KD is pin-compatible with LM324, LM2902, and all members of the LMx24/LM2902 family in SOIC-14 (D) package. Pin numbering, function, and physical layout match exactly per TI's Pin Configuration and Functions documentation. However, electrical parameters differ - notably LM224KD has ±3 mV max offset vs. ±7 mV for LM324 - so functional substitution requires verification of circuit tolerance.
What is the operating temperature range of LM224KD?
The LM224KD is rated for operation from –25°C to +85°C. This range is explicitly defined in TI's device information tables and distinguishes it from LM224 (–25°C to +85°C), LM324 (0°C to 70°C), and LM2902 (–40°C to +125°C). All electrical specifications for LM224KD are guaranteed within this ambient temperature window.
Can LM224KD drive capacitive loads directly?
Yes, LM224KD is characterized to drive capacitive loads up to 100 pF while maintaining stability, as confirmed in the Electrical Characteristics table under "Capacitive load drive". For loads exceeding 100 pF, external isolation resistance (e.g., 100 Ω in series with the output) is recommended to prevent peaking or oscillation, especially in high-gain configurations.
LM224KD 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:
- 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
LM224KD FAQ
1.How can I place an order for LM224KD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM224KD 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 LM224KD reliable?
The price and inventory of LM224KD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM224KD is usually 5 days.
3.What payment methods are accepted for LM224KD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM224KD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM224KD?
LM224KD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM224KD 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 LM224KD?
For technical support, including LM224KD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM224KD requirements.
6.How does Aetrix verify that LM224KD is sourced from the original manufacturer or authorized distributors?
All LM224KD 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 LM224KD meets industry standards.
7.What is the process for return or replacement of LM224KD?
All LM224KD units undergo pre-shipment inspection (PSI). If there is an issue with LM224KD, 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 LM224KD part is unused and in its original packaging.
Return procedure for LM224KD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM224KD 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
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
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