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Texas Instruments LM324KADR
- Part No.:
- LM324KADR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM324KADR.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,982
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Product details
Overview
LM324KADR from Texas Instruments is a quad operational amplifier in SOIC-14 package, designed for cost-sensitive single-supply applications. It delivers rail-to-rail input (common-mode down to V–), 36V max supply range, ±3mV max input offset voltage at 25°C, 1.2MHz gain-bandwidth product, and 240µA typical quiescent current per amplifier - enabling use in industrial sensor signal conditioning and power supply feedback loops.
For engineers reviewing the LM324KADR datasheet, LM324KADR pinout, LM324KADR application, or LM324KADR equivalent, key selection criteria include its guaranteed operation from –40°C to +85°C, output swing within 1.5V of V+ and 150mV of V– at 1mA load, unity-gain stability, and drop-in compatibility with legacy LM324 variants without layout changes.
Technical Context
The LM324KADR implements a standard BJT-based op-amp architecture with p-n-p input stage, supporting single-supply operation where the common-mode input range extends to the negative rail (V–). Its internal compensation ensures unity-gain stability across all four amplifiers without external components.
It features integrated EMI/RF filtering and 2kV HBM ESD protection, making it suitable for electrically noisy environments such as AC inverter control boards and multi-function printer power management subsystems. The device does not support rail-to-rail output swing but achieves 1.5V headroom from V+ and 150mV from V– under 1mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3V to 36V - supports wide-input industrial supplies and battery-backed systems without level-shifting. |
| Input Offset Voltage (max) | ±3mV at 25°C - enables accurate DC-coupled amplification in 12-bit ADC front-ends. |
| Gain-Bandwidth Product | 1.2MHz - sufficient for anti-aliasing filters up to ~100kHz and closed-loop gains ≤100. |
| Quiescent Current (per amp) | 240µA typical - allows four-channel amplification in low-power IoT sensor nodes. |
| Common-Mode Input Range | Includes V– (ground in single-supply) - eliminates need for biasing resistors in transducer interfaces. |
| Output Voltage Swing | Within 1.5V of V+, 150mV of V– at 1mA - constrains dynamic range in 5V/12V systems but avoids clipping near rails. |
| ESD Rating (HBM) | 2kV - meets IEC 61000-4-2 Level 2 for handling in non-ESD-controlled assembly lines. |
Pinout & Package
LM324KADR is housed in a 14-pin SOIC (D) package measuring 8.65mm × 6mm, with standard JEDEC MS-012AC footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1IN– (Pin 2) | Inverting input | Accepts feedback or inverted signal path; referenced to V– in single-supply configurations. |
| 1IN+ (Pin 3) | Non-inverting input | Direct connection point for reference or sensor signals; common-mode range includes V–. |
| 1OUT (Pin 1) | Amplifier 1 output | Drives loads up to 1mA with 150mV headroom to V–; requires external pull-up for open-collector emulation. |
| VCC+ (Pin 4) | Positive supply | Connects to main system rail (e.g., 12V, 24V); decoupling capacitor required within 1cm. |
| 2IN+ (Pin 5) | Non-inverting input | Independent channel input; shares no internal coupling with other amplifiers. |
| 2IN– (Pin 6) | Inverting input | Used for differential or inverting gain stages; matched offset tracking with Pin 2. |
| 2OUT (Pin 7) | Amplifier 2 output | Electrically isolated output; supports independent loading without crosstalk (120dB rejection). |
| VCC– (Pin 11) | Negative supply / ground | Return path for all four amplifiers; must be low-impedance in single-supply designs. |
| 3IN– (Pin 9) | Inverting input | Third channel inverting node; validated for continuous operation at VCM = V–. |
| 3IN+ (Pin 10) | Non-inverting input | Third channel positive input; identical electrical specs to Pins 2/3/5. |
| 3OUT (Pin 8) | Amplifier 3 output | Capable of sourcing/sinking ±20mA short-circuit current; thermal derating applies above 85°C. |
| 4IN– (Pin 13) | Inverting input | Fourth channel inverting terminal; supports same input voltage differential as supply rails. |
| 4IN+ (Pin 12) | Non-inverting input | Fourth channel positive input; fully specified over –40°C to +85°C ambient range. |
| 4OUT (Pin 14) | Amplifier 4 output | Final output stage; matches performance of Pins 1/7/8 including slew rate (0.5V/μs) and settling time (4μs). |
Key Features
| Feature | Design Value |
|---|---|
| Drop-in replacement for LM324/LM224/LM2902 | Pin-compatible and functionally identical to legacy versions - no PCB redesign needed. |
| EMI/RF filtering | Integrated on-die filter reduces susceptibility to 100MHz–1GHz noise in motor drive and SMPS environments. |
| Rail-to-rail input | Common-mode range includes V–, enabling direct interface with 0V-referenced sensors like thermistors and strain gauges. |
| Low quiescent current | 240µA per amplifier at 5V supply - supports always-on monitoring in battery-powered HVAC controllers. |
| High ESD robustness | 2kV HBM rating - improves manufacturing yield and field reliability in unshielded industrial enclosures. |
Applications
| Industrial Sensor Signal Conditioning | Power Supply Feedback Loop |
|---|---|
Use Scenario: Amplifying low-level mV outputs from RTDs, thermocouples, or pressure bridges in PLC analog input modules. IC Role / Device Role / Timing Role: Quad op-amp configured as precision instrumentation amplifier (two amps), buffer (one amp), and comparator hysteresis generator (one amp). Use Value: Input offset ≤±3mV and CMRR ≥70dB ensure <0.5% measurement error across –40°C to +85°C operating range. | Use Scenario: Regulating output voltage in 24V/48V industrial DC-DC converters using optocoupler-isolated feedback. IC Role / Device Role / Timing Role: Error amplifier comparing sensed output against reference; drives optocoupler LED via buffered output. Use Value: Unity-gain stability and 1.2MHz GBW allow stable loop compensation with minimal external components. |
| Multi-Function Printer Power Management | AC Inverter Motor Control |
Use Scenario: Managing multiple voltage rails (e.g., 3.3V logic, 12V heater, 24V stepper driver) with individual overvoltage/undervoltage monitors. IC Role / Device Role / Timing Role: Four independent comparators or window detectors monitoring each rail's regulation status. Use Value: Guaranteed operation at 85°C ambient and 2kV HBM rating withstand repeated hot-plug events during service. | Use Scenario: Isolating and scaling current-sense signals from shunt resistors in three-phase IGBT gate drivers. IC Role / Device Role / Timing Role: Differential amplifier rejecting common-mode noise on high-side shunt measurements; feeds ADC input. Use Value: 120dB channel separation prevents cross-talk between phase-current measurements in 10kHz PWM environments. |
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 and electrical specs; rated for 0°C to 70°C ambient (vs. –40°C to +85°C for LM324KADR) | Limited to commercial-grade equipment (e.g., desktop PCs, consumer printers) without extended temperature requirements | Select LM324DR only when full industrial temperature range is unnecessary and cost is primary constraint. |
| LM2902KADR | Identical pinout and SOIC-14 package; wider operating range (–40°C to +125°C) and same ±3mV offset, but lower PSRR (50dB vs. 65dB) | Better suited for automotive engine bay or high-temp industrial inverters where ambient exceeds 85°C | Choose LM2902KADR when ambient exceeds 85°C or when AEC-Q200 qualification is required. |
Compared with LM324DR, LM324KADR provides guaranteed operation at –40°C and improved PSRR for noisy power rails; compared with LM2902KADR, it offers tighter supply rejection at lower cost but lacks extended high-temperature capability.
Availability
LM324KADR is available at Aetrix Electronics and suitable for industrial sensor interfaces, power supply feedback circuits, and multi-function printer subsystems requiring stable component supply across long production lifecycles.
Supply support for LM324KADR 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 experience in op-amp design and industrial-grade component validation.
The LM324KADR belongs to TI's legacy LMx24 family of general-purpose quad op-amps, engineered for cost-sensitive, high-reliability applications in industrial automation, power conversion, and office equipment where robustness and long-term supply stability are critical.
FAQ
What is the maximum supply voltage for LM324KADR?
The absolute maximum supply voltage for LM324KADR is 40V, but the recommended operating range is 3V to 36V. Operation at 36V is fully characterized across –40°C to +85°C, while sustained use above 30V may require thermal derating due to increased power dissipation. Always observe the 150°C junction temperature limit and consult TI's thermal metrics (RθJA = 99.3°C/W for SOIC-14) for board-level design.
Does LM324KADR support rail-to-rail output?
No, LM324KADR does not support rail-to-rail output. Its output swings to within 1.5V of V+ and 150mV of V– at 1mA load. At lighter loads (e.g., 50µA), it reaches 1.35V below V+ and 100mV above V–. For true rail-to-rail output, consider TI's TLV2464 or similar modern alternatives - LM324KADR's architecture prioritizes cost, stability, and input rail-to-rail capability over output swing.
Is LM324KADR pin-compatible with LM324A?
Yes, LM324KADR is pin-compatible with LM324A and all standard LM324 variants in SOIC-14 packaging. Both share identical pinout, supply connections, and functional behavior. However, LM324KADR specifies ±3mV max input offset at 25°C (same as LM324A), but guarantees operation over –40°C to +85°C - whereas LM324A is typically rated for 0°C to 70°C unless explicitly marked as 'KA' or 'KADR'.
What is the input bias current specification for LM324KADR?
The input bias current for LM324KADR is –35nA maximum at 25°C and –60nA maximum across –40°C to +85°C. This value reflects the base current of its bipolar input stage and remains stable over temperature. Designers should account for this current when sizing high-impedance feedback networks - for example, a 1MΩ resistor introduces up to 35mV of offset error, necessitating compensation techniques in precision applications.
Can LM324KADR drive capacitive loads?
LM324KADR is characterized to drive up to 100pF capacitive loads without oscillation, provided proper PCB layout (short traces, local bypassing, ground plane). Driving larger capacitive loads (e.g., >200pF) risks instability due to phase margin reduction; TI recommends adding a series resistor (10–100Ω) between the output and load capacitance to isolate the amplifier from reactive loading. This technique preserves 56° phase margin and maintains 4μs settling time to 0.1%.
LM324KADR 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:
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LM324KADR FAQ
1.How can I place an order for LM324KADR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM324KADR 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 LM324KADR reliable?
The price and inventory of LM324KADR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM324KADR is usually 5 days.
3.What payment methods are accepted for LM324KADR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM324KADR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM324KADR?
LM324KADR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM324KADR 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 LM324KADR?
For technical support, including LM324KADR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM324KADR requirements.
6.How does Aetrix verify that LM324KADR is sourced from the original manufacturer or authorized distributors?
All LM324KADR 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 LM324KADR meets industry standards.
7.What is the process for return or replacement of LM324KADR?
All LM324KADR units undergo pre-shipment inspection (PSI). If there is an issue with LM324KADR, 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 LM324KADR part is unused and in its original packaging.
Return procedure for LM324KADR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM324KADR Tags
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