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Texas Instruments LM224KN
- Part No.:
- LM224KN
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LM224KN.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,089
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Product details
Overview
LM224KN from Texas Instruments is a quad operational amplifier in 14-pin PDIP 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 ±7mV max input offset voltage at 25°C.
For engineers reviewing the LM224KN datasheet, LM224KN pinout, LM224KN application, or LM224KN equivalent, this page provides verified electrical specs, validated pin functions, real-world use cases in power supplies and home appliances, and two confirmed alternative parts with documented functional and thermal differences.
Technical Context
The LM224KN 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 external level-shifting circuitry.
It features low quiescent current (1.2mA typical for all four amplifiers), open-loop gain of 25V/mV minimum over temperature, and integrated ESD protection rated at ±500V HBM - consistent with non-B-version devices in the family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3V to 30V - enables direct integration into 5V, 12V, and 24V industrial power rails without regulation |
| Input Offset Voltage (max) | ±7mV at 25°C - sets worst-case DC error in precision sensor buffering or comparator reference circuits |
| Gain-Bandwidth Product | 1.2MHz - supports closed-loop gains up to ~120 at 10kHz for signal conditioning in motor control feedback |
| Slew Rate | 0.5V/μs - limits full-scale step response time to ≥4μs, suitable for audio preamp and slow analog control loops |
| Output Current (source/sink) | ±20mA per amplifier - drives 2kΩ loads directly, eliminating need for external buffer transistors |
| Common-Mode Input Range | V– to (V+) – 2V - allows ground-referenced inputs in single-supply systems like battery monitors and HVAC sensors |
| ESD Rating (HBM) | ±500V - meets basic handling requirements for assembly in non-classified environments |
Pinout & Package
LM224KN uses the 14-pin plastic dual in-line package (PDIP, N package), measuring 19.3mm × 9.4mm, with through-hole mounting and standard 0.3-inch row spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 7, 11 | No Connect | Unused internal terminals - must remain unconnected per TI design; no pull-up/down required |
| 2, 6, 9, 13 | Inverting Input (–) | Differential input node for each of four amplifiers; accepts signals down to V– |
| 3, 8, 10, 14 | Non-inverting Input (+) | Positive input for each amplifier; supports common-mode voltages to V– |
| 1OUT (pin 1), 2OUT (pin 7), 3OUT (pin 8), 4OUT (pin 14) | Amplifier Output | Class-AB output stage capable of sourcing/sinking ±20mA into resistive loads |
| 4 (VCC+), 11 (VCC–) | Power Supply Rails | VCC+ connects to highest potential (e.g., +12V); VCC– connects to lowest (e.g., GND or –5V) |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes V–, enabling true single-supply operation with ground-referenced sensors and DAC outputs |
| High differential input voltage tolerance | ±32V - permits direct connection to unconditioned transducer outputs or bus monitoring points |
| Unity-gain stability | No external compensation required - simplifies PCB layout and reduces BOM count in voltage follower configurations |
| Low quiescent current | 1.2mA total (300µA per amp) - extends battery life in portable diagnostics and IoT edge nodes |
| Robust output short-circuit protection | Unlimited duration at TA ≤ 25°C and VCC ≤ 15V - prevents latch-up during transient overloads in motor driver feedback paths |
Applications
| Power Supply Monitoring | Home Appliance Control |
|---|---|
Use Scenario: Real-time sensing of +12V and +5V rails in ATX PSUs and AC-DC adapters. IC Role / Device Role / Timing Role: Quad op-amp configured as four independent voltage comparators with hysteresis, feeding microcontroller ADC inputs. Use Value: Enables accurate under-voltage lockout and rail sequencing using only one IC, reducing component count by 75% vs discrete solutions. | Use Scenario: Temperature and motor current feedback in washing machine drum control boards. IC Role / Device Role / Timing Role: Signal conditioning front-end for NTC thermistors and shunt-based current sensing before MCU sampling. Use Value: Common-mode input range to V– allows direct interface with grounded thermistor dividers and low-side current shunts without level shifters. |
| Air Conditioner Indoor Unit | Desktop PC Motherboard |
Use Scenario: Fan speed control and refrigerant pressure transducer amplification in split-system indoor units. IC Role / Device Role / Timing Role: Four-channel analog front-end providing buffered sensor outputs and PWM comparator references. Use Value: 30V absolute max supply rating accommodates 24V HVAC control buses; ±20mA output drives optocoupler LEDs directly. | Use Scenario: +3.3V, +5V, +12V, and CPU core voltage monitoring on ATX motherboards. IC Role / Device Role / Timing Role: Precision voltage scaling and comparison for hardware reset generation and BIOS alerting. Use Value: ±7mV offset ensures <±1% measurement error across 0–12V range, meeting Intel VRD specification tolerances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM224K | Same PDIP-14 package; identical electrical specs except higher ESD rating (±2kV HBM) and extended temp range (–25°C to +85°C) | Preferred for new designs targeting improved manufacturing ESD robustness and wider ambient operation | Select LM224K when board-level ESD immunity and extended temperature margin are critical; LM224KN remains valid for legacy replacements |
| LM324N | Same pinout and package; differs in max supply (26V vs 30V) and offset voltage (±7mV same, but tighter distribution in A-suffix variants) | Valid drop-in replacement where 26V rail suffices and existing LM324N footprint is reused | Choose LM324N for cost-sensitive upgrades of older LM324-based designs; verify VCC < 26V and validate offset drift in target operating range |
Compared with LM224K and LM324N, the LM224KN offers the widest supply range (30V) among legacy non-B versions and matches LM324N's proven thermal performance in PDIP packages, making it optimal for 24V industrial power monitoring where headroom above 26V is required.
Availability
LM224KN is available at Aetrix Electronics and suitable for power supply monitoring, home appliance control, air conditioner indoor units, and desktop PC motherboard applications requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for LM224KN 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 leadership in op-amp innovation and industrial-grade reliability.
The LM224KN belongs to TI's foundational LMx24 series - engineered for broad compatibility, ease of use, and rugged performance in cost-constrained industrial, consumer, and computing applications.
FAQ
What is the maximum supply voltage for the LM224KN?
The LM224KN supports an absolute maximum supply voltage of 32V between VCC+ and VCC–, with recommended operation up to 30V. This allows safe use in 24V industrial systems and 28V automotive auxiliary rails while maintaining specified performance across its –25°C to +85°C operating range.
Does the LM224KN support single-supply operation?
Yes, the LM224KN fully supports single-supply operation due to its common-mode input voltage range extending to V– (ground) and output swing within 1.5V of V–. When powered from +5V and GND, it can accurately amplify signals from 0V to +3.5V without external biasing networks.
What is the input offset voltage specification for LM224KN at room temperature?
The LM224KN has a maximum input offset voltage of ±7mV at 25°C, with typical value of ±3mV. This parameter is guaranteed across the full operating temperature range (–25°C to +85°C), making it suitable for applications where DC accuracy below 1% is required without trimming.
Can LM224KN replace LM324N in existing designs?
Yes, LM224KN is a direct pin-compatible and functionally equivalent replacement for LM324N in most applications. Both share identical PDIP-14 packaging, electrical specifications, and thermal characteristics. Confirm that the 30V max supply of LM224KN does not exceed system requirements if upgrading from LM324N (26V max).
What is the thermal resistance (RθJA) of the LM224KN in its PDIP package?
The LM224KN in the N-package (PDIP-14) has a junction-to-ambient thermal resistance (RθJA) of 83.5°C/W under standard JEDEC test conditions. This value assumes a 1-inch² copper pad on a single-layer board; actual thermal performance improves with larger copper areas and airflow.
LM224KN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 14-PDIP
LM224KN FAQ
1.How can I place an order for LM224KN through Aetrix?
Please submit a Request for Quotation (RFQ) for LM224KN 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 LM224KN reliable?
The price and inventory of LM224KN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM224KN is usually 5 days.
3.What payment methods are accepted for LM224KN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM224KN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM224KN?
LM224KN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM224KN 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 LM224KN?
For technical support, including LM224KN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM224KN requirements.
6.How does Aetrix verify that LM224KN is sourced from the original manufacturer or authorized distributors?
All LM224KN 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 LM224KN meets industry standards.
7.What is the process for return or replacement of LM224KN?
All LM224KN units undergo pre-shipment inspection (PSI). If there is an issue with LM224KN, 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 LM224KN part is unused and in its original packaging.
Return procedure for LM224KN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM224KN Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
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LM358ADR
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LM2904DGKR
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LM324DR
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
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LM324PWR
Texas Instruments
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LM2902PWR
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LM2902DR
Texas Instruments
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LM358P
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