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Texas Instruments LM224KDG4
- Part No.:
- LM224KDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM224KDG4.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,015
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Product details
Overview
LM224KDG4 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 robust output drive (±20mA per channel). It operates from 3V to 30V supply, delivers 1.2MHz gain-bandwidth, 0.5V/μs slew rate, and achieves ±3mV max input offset voltage at 25°C with 240μA typical quiescent current per amplifier - enabling precision signal conditioning in power supplies and appliance control boards.
For engineers reviewing the LM224KDG4 datasheet, LM224KDG4 pinout, LM224KDG4 application, or LM224KDG4 equivalent, this page provides verified electrical specifications, validated SOIC-14 pin mapping, real-world use cases in AC inverters and multi-function printers, and two confirmed drop-in alternatives with documented thermal and ESD performance differences.
Technical Context
The LM224KDG4 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 voltage tolerance up to ±32V. Its unity-gain stable architecture supports single-supply operation without level-shifting circuitry.
It features internal ESD protection rated at ±500V HBM and ±1000V CDM, and is characterized across –25°C to +85°C ambient temperature - matching the LM224K specification tier defined in TI's SLOS066AE datasheet revision September 2025.
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) | ±3 mV at 25°C - enables accurate DC-coupled amplification in sensor front-ends and feedback loops |
| Gain-Bandwidth Product | 1.2 MHz - sufficient for anti-aliasing filters, active low-pass stages, and motor current sensing up to ~100kHz |
| Slew Rate | 0.5 V/μs - limits large-signal transient response but ensures stability with capacitive loads ≤100pF |
| Quiescent Current (per amp) | 240 μA typical - allows four-channel amplification in always-on subsystems with <1mA total IQ |
| Output Drive Capability | ±20 mA source/sink - drives 2kΩ loads directly, eliminating need for external buffer transistors in relay drivers |
| Common-Mode Input Range | V– to (V+) – 2V - permits ground-referenced inputs in single-supply configurations without bias resistors |
Pinout & Package
LM224KDG4 is housed in a 14-pin SOIC (D package), 8.65mm × 6mm 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 airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1IN– (Pin 2) | Inverting input | Negative feedback node for all standard op-amp configurations (inverting amp, integrator, comparator) |
| 1IN+ (Pin 3) | Non-inverting input | Reference or signal input for non-inverting gain stages and voltage followers |
| 1OUT (Pin 1) | Amplifier 1 output | Drives external load or next stage; capable of ±20mA into 2kΩ |
| VCC+ (Pin 4) | Positive supply | Connects to highest potential rail (3V–30V); decoupling capacitor required near pin |
| 2IN+ (Pin 5) | Non-inverting input | Independent input for second amplifier; shares no internal coupling with other channels |
| 2IN– (Pin 6) | Inverting input | Used for differential input pairs or summing junctions in multi-amplifier topologies |
| 2OUT (Pin 7) | Amplifier 2 output | Electrically isolated output; layout separation recommended to avoid crosstalk above 20kHz |
| VCC– (Pin 11) | Negative supply / ground | Return path for all four amplifiers; must be low-impedance for stable CMRR and PSRR |
| 3IN– (Pin 9) | Inverting input | Supports third channel in multi-stage filtering or instrumentation amplifier front-end |
| 3IN+ (Pin 10) | Non-inverting input | Enables independent biasing for channel 3; compatible with resistor-divider reference networks |
| 3OUT (Pin 8) | Amplifier 3 output | Validated for driving LED strings or small solenoids via series current-limiting resistor |
| 4IN– (Pin 13) | Inverting input | Used in fourth-channel error amplification for dual-output power supplies |
| 4IN+ (Pin 12) | Non-inverting input | Accepts feedback from secondary output rail; supports remote sensing configurations |
| 4OUT (Pin 14) | Amplifier 4 output | Meets 0.1% settling in 4μs (2V step), suitable for fast-response analog comparators with hysteresis |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input (V– included) | Eliminates input biasing network in single-supply designs, reducing BOM count and PCB area |
| High ESD immunity (±500V HBM) | Withstands handling and board-level ESD events without latch-up or parameter shift |
| Unity-gain stable | Operates reliably with no external compensation in voltage-follower or gain-of-1 configurations |
| Low quiescent current (240μA/amp) | Enables four-channel analog signal processing in energy-constrained embedded controllers |
| 120dB channel separation | Prevents inter-channel crosstalk in multi-sensor acquisition systems operating up to 20kHz |
Applications
| Power Supply Feedback Control | Appliance Motor Interface |
|---|---|
Use Scenario: Regulating output voltage in offline AC-DC adapters using optocoupler-isolated feedback loop. IC Role / Device Role / Timing Role: Error amplifier comparing sensed output against reference, driving optocoupler LED with compensated loop response. Use Value: ±3mV offset ensures <1% regulation error over line/load; 1.2MHz GBW supports >50kHz loop bandwidth for fast transient recovery. | Use Scenario: Driving brushed DC motors in washing machine drum control with PWM-based speed regulation. IC Role / Device Role / Timing Role: Current-sense amplifier feeding motor controller ADC, with gain-set resistors defining 50mV/A scaling. Use Value: V–-to-rail input accepts shunt voltage down to 0V; ±20mA output drives 10kΩ ADC input impedance directly. |
| Multi-Function Printer Sensor Hub | Indoor Air Conditioner Thermostat |
Use Scenario: Conditioning signals from paper jam sensors, toner level photodiodes, and fuser temperature thermistors. IC Role / Device Role / Timing Role: Four-channel signal conditioner: one for thermistor linearization, two for photodiode transimpedance, one for comparator hysteresis. Use Value: Single SOIC-14 replaces discrete op-amp quad; 240μA/amp enables always-on sensor monitoring with <1mA total standby current. | Use Scenario: Analog front-end for NTC thermistor-based room temperature measurement in split-system HVAC indoor units. IC Role / Device Role / Timing Role: Precision voltage follower buffering thermistor divider, followed by 2nd-order active low-pass filter (cutoff = 10Hz). Use Value: ±3mV offset contributes <0.3°C error at 25°C; 0.5V/μs slew rate prevents distortion in filtered 1Hz thermal signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM224DR | Same SOIC-14 package, identical electrical specs (±3mV VOS, 1.2MHz GBW), but rated for –25°C to +85°C only - no extended temp validation | Not qualified for automotive under-hood or industrial environments exceeding +85°C ambient | Select LM224DR only when full LM224K temperature range is not required and cost optimization is critical |
| LM324N | PDIP-14 package, same 3V–30V supply, but higher ±7mV max offset and lower 15V max supply rating - not drop-in for 24V systems | Requires PCB redesign due to through-hole mounting and different thermal profile; unsuitable for 24V industrial SMPS | Choose LM324N only for legacy through-hole designs where SOIC footprint is unavailable and 24V operation is unnecessary |
Compared with LM224DR, LM224KDG4 offers guaranteed performance across its full –25°C to +85°C range and tighter production screening; versus LM324N, it provides surface-mount compatibility, higher supply voltage margin, and lower offset - making it preferable for new industrial control designs.
Availability
LM224KDG4 is available at Aetrix Electronics and suitable for merchant network power supplies, multi-function printers, and indoor air conditioners requiring stable component supply with consistent parametric performance across manufacturing lots.
Supply support for LM224KDG4 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, with over 50 years of op-amp innovation and broad distribution infrastructure.
The LM224KDG4 belongs to TI's legacy LMx24 product line - engineered for cost-effective, general-purpose analog signal conditioning in industrial, appliance, and power electronics where reliability, wide supply range, and proven long-term availability are essential.
FAQ
What is the maximum operating temperature range for LM224KDG4?
The LM224KDG4 is specified for operation from –25°C to +85°C ambient temperature, as confirmed in TI's SLOS066AE datasheet Section 6.3. This range applies to all electrical characteristics including input offset voltage, gain-bandwidth, and output drive capability. Operation outside this range may result in parameter degradation or functional failure.
Does LM224KDG4 support rail-to-rail output swing?
No, LM224KDG4 does not provide rail-to-rail output swing. Its output voltage swing is limited to within 1.5V of each rail under 2kΩ load (e.g., VOH ≥ VCC–1.5V, VOL ≤ 1.5V above VCC–). At 1mA load, positive swing is typically 1.4V below VCC and negative swing is 0.75V above VCC– - verified in Section 6.7 of the datasheet.
Is LM224KDG4 pin-compatible with LM324 or LM2902?
Yes, LM224KDG4 is pin-compatible with LM324 and LM2902 in SOIC-14 (D) package per TI's device information table. All share identical pin numbering and function mapping (e.g., Pin 1 = 1OUT, Pin 4 = VCC+, Pin 11 = VCC–). However, LM2902 has different input offset (±7mV) and temperature range (–40°C to +125°C), so direct substitution requires validation of those parameters.
What is the ESD rating of LM224KDG4?
LM224KDG4 has an ESD rating of ±500V HBM (Human Body Model) and ±1000V CDM (Charged Device Model), as specified in Section 6.2 of the TI SLOS066AE datasheet. These values reflect qualification testing per ANSI/ESDA/JEDEC JS-001 and JESD22-C101 standards - confirming suitability for standard automated assembly lines with controlled ESD protocols.
Can LM224KDG4 drive capacitive loads?
LM224KDG4 is characterized to drive capacitive loads up to 100pF while maintaining stability, as stated in Section 6.5 (CLOAD parameter). Driving larger capacitive loads (e.g., >200pF) risks phase margin reduction and potential oscillation; TI recommends adding a series isolation resistor (e.g., 10–100Ω) between amplifier output and heavy capacitive load to preserve stability.
LM224KDG4 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
LM224KDG4 FAQ
1.How can I place an order for LM224KDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM224KDG4 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 LM224KDG4 reliable?
The price and inventory of LM224KDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM224KDG4 is usually 5 days.
3.What payment methods are accepted for LM224KDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM224KDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM224KDG4?
LM224KDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM224KDG4 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 LM224KDG4?
For technical support, including LM224KDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM224KDG4 requirements.
6.How does Aetrix verify that LM224KDG4 is sourced from the original manufacturer or authorized distributors?
All LM224KDG4 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 LM224KDG4 meets industry standards.
7.What is the process for return or replacement of LM224KDG4?
All LM224KDG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM224KDG4, 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 LM224KDG4 part is unused and in its original packaging.
Return procedure for LM224KDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM224KDG4 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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