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Texas Instruments LM324KNSR
- Part No.:
- LM324KNSR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
LM324KNSR.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,999
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Product details
Overview
LM324KNSR from Texas Instruments is a quad operational amplifier in NS (SOP-14) package, designed for cost-sensitive industrial and consumer applications. It delivers rail-to-rail input capability (common-mode range includes V–), 36V max supply voltage, ±3mV max input offset voltage at 25°C, 1.2MHz gain-bandwidth product, and 240µA typical quiescent current per amplifier - enabling precision signal conditioning in single-supply systems such as power supply monitoring and sensor interfaces.
For engineers reviewing the LM324KNSR datasheet, LM324KNSR pinout, LM324KNSR application, or LM324KNSR equivalent, this page provides verified electrical specifications, validated pin functions for SOP-14, real-world use cases in AC inverters and multi-function printers, and two confirmed alternative parts with documented functional and thermal differences.
Technical Context
The LM324KNSR implements four independent high-voltage op amps in a single monolithic IC with unity-gain stability and integrated EMI/RF filtering. Its input stage supports common-mode voltages down to the negative rail (V–), allowing true single-supply operation without level-shifting circuitry.
Each amplifier features low input bias current (≤35nA max at 25°C), 0.5V/µs slew rate, and output swing within 1.5V of the positive rail and 100mV of the negative rail under light load - making it suitable for transducer amplification and active filter stages where input headroom and output drive are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3V to 36V - 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 with ≤0.1% initial error. |
| Gain-Bandwidth Product | 1.2 MHz - sufficient for anti-aliasing filters up to ~100 kHz and closed-loop gains ≤100. |
| Quiescent Current (per amp) | 240 µA typical - allows four-channel operation below 1 mA total, ideal for low-power embedded control. |
| Common-Mode Input Range | Includes V– (ground in single-supply) - eliminates need for input biasing resistors in ground-referenced signal paths. |
| Output Swing (V– side) | 100 mV above V– at 50 µA load - ensures usable dynamic range near ground in 3.3V or 5V microcontroller interfaces. |
| ESD Rating (HBM) | 2 kV - meets IEC 61000-4-2 Level 2 for robustness in manufacturing and field environments. |
Pinout & Package
LM324KNSR is housed in a 14-pin SOP (Small Outline Package) with 10.3mm × 7.8mm footprint, optimized for surface-mount assembly and moderate thermal dissipation (RθJA = 90.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1IN– | Negative input | Inverting input of Amplifier 1; accepts signals down to V– with no phase inversion penalty. |
| 1IN+ | Positive input | Non-inverting input of Amplifier 1; used for unity-gain buffers or differential sensing. |
| 1OUT | Output | Amplifier 1 output; drives loads ≥10kΩ to within 1.5V of V+ and 100mV of V–. |
| VCC+ | Positive supply | Primary power rail (3–36V); decoupling capacitor required at pin for stability. |
| 2IN+ | Positive input | Non-inverting input of Amplifier 2; electrically isolated from other channels. |
| 2IN– | Negative input | Inverting input of Amplifier 2; shares no internal coupling with other inputs. |
| 2OUT | Output | Amplifier 2 output; identical performance to 1OUT with channel separation >120 dB. |
| VCC– | Negative supply / ground | Reference node for single-supply operation; must be connected even when tied to GND. |
| 3OUT | Output | Amplifier 3 output; fully independent; supports simultaneous multi-channel signal processing. |
| 3IN– | Negative input | Inverting input of Amplifier 3; validated for differential input voltages up to ±40V. |
| 3IN+ | Positive input | Non-inverting input of Amplifier 3; common-mode range extends to VCC+ − 1.5V. |
| 4IN+ | Positive input | Non-inverting input of Amplifier 4; pin-compatible across LMx24 family variants. |
| 4IN– | Negative input | Inverting input of Amplifier 4; supports input overvoltage up to supply rails. |
| 4OUT | Output | Amplifier 4 output; capable of sourcing/sinking ±20mA short-circuit current. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input (V– inclusive) | Enables direct interfacing with ground-referenced sensors (e.g., thermistors, strain gauges) without external bias networks. |
| Integrated EMI/RF filter | Reduces susceptibility to 30–1000 MHz noise in motor drive and switching power supply environments. |
| Low quiescent current (240 µA/amp) | Permits always-on monitoring circuits in battery-powered HVAC controllers with multi-year runtime. |
| High channel separation (120 dB) | Prevents crosstalk between analog channels in multi-sensor data acquisition modules. |
| Drop-in replacement for LM324/LM2902 | Allows legacy board reuse without layout changes when upgrading to B-version performance and reliability. |
Applications
| Power Supply Monitoring | Multi-Function Printer Engine Control |
|---|---|
Use Scenario: Real-time voltage supervision of +12V and +5V rails in server PSU feedback loops. IC Role / Device Role / Timing Role: Quad op amp configured as comparator and error amplifier for overvoltage/undervoltage detection and regulation. Use Value: Single LM324KNSR replaces four discrete comparators, reducing BOM count and PCB area while maintaining ±3mV threshold accuracy. | Use Scenario: Toner density feedback and paper path sensor signal conditioning in laser printer engine boards. IC Role / Device Role / Timing Role: Four independent amplifiers for photodiode pre-amplification, motor current sensing, fuser temperature scaling, and paper jam detection. Use Value: Rail-to-rail input enables direct connection to 0–3.3V ADC inputs; low IQ extends sleep-mode battery life in portable models. |
| AC Inverter Motor Control | Desktop PC Motherboard Health Monitoring |
Use Scenario: Current sensing and DC bus voltage scaling in 1–5 kW residential solar inverters. IC Role / Device Role / Timing Role: Amplifier 1–2: shunt-based phase current amplification; Amplifier 3–4: DC-link voltage division and offset correction. Use Value: 36V supply rating and ±40V differential input tolerance eliminate external protection components on high-side sense paths. | Use Scenario: +3.3V, +5V, +12V, and CPU core voltage monitoring on ATX motherboards. IC Role / Device Role / Timing Role: Quad amplifier used as precision voltage followers feeding ADC inputs for system health reporting. Use Value: Common-mode range including ground allows direct measurement of all rail voltages relative to motherboard GND without level shifters. |
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 | SOP-14 package, same pinout; ±7mV max offset voltage (vs. ±3mV for LM324KNSR); 1.2MHz GBW unchanged. | Lower precision; suitable for non-critical gain stages but not for <1% accuracy sensor paths. | Select LM324DR only when offset drift and EMI immunity are non-critical and cost is primary constraint. |
| LM2902KNSR | Same NS package and pinout; rated for –40°C to +125°C (vs. 0°C to +70°C for LM324KNSR); ±7mV offset max. | Extended temperature support for automotive HVAC or outdoor AC units; higher offset limits reduce DC accuracy. | Choose LM2902KNSR for designs requiring industrial temperature grade where LM324KNSR's 0–70°C range is insufficient. |
Compared with LM324DR and LM2902KNSR, LM324KNSR offers the best balance of precision (±3mV offset), commercial temperature range (0°C to +70°C), and EMI-hardened design - making it optimal for cost-sensitive consumer electronics where signal fidelity matters more than extended temperature operation.
Availability
LM324KNSR is available at Aetrix Electronics and suitable for merchant network power supplies, multi-function printers, and desktop PC motherboards requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LM324KNSR 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 manufacturing.
The LM324KNSR belongs to TI's legacy LMx24 op amp product line, engineered for high-volume, cost-optimized applications demanding reliability, ease of use, and broad supply voltage compatibility - particularly in industrial controls and consumer power electronics.
FAQ
What is the maximum supply voltage for LM324KNSR?
The absolute maximum supply voltage for LM324KNSR is 40V, but the recommended operating range is 3V to 36V. Operating beyond 36V risks exceeding absolute maximum ratings and may cause permanent damage. The device is specified for reliable operation at 36V across its full temperature range (0°C to +70°C), supporting high-voltage industrial power rails without external regulators.
Does LM324KNSR support single-supply operation?
Yes, LM324KNSR supports true single-supply operation because its common-mode input voltage range includes the negative supply rail (V–), which can be grounded. This allows direct amplification of signals referenced to ground - such as thermistor outputs or current-sense shunt voltages - without input biasing resistors or dual supplies.
What is the input offset voltage specification for LM324KNSR?
The input offset voltage for LM324KNSR is ±3 mV maximum at 25°C, per the LM324xx family datasheet. This value increases to ±4 mV over the full operating temperature range (0°C to +70°C). The LM324KNSR is not the "BA" variant (which specifies ±2 mV), nor the "B" variant (which also specifies ±3 mV but with enhanced ESD and EMI specs).
Is LM324KNSR pin-compatible with LM324DR?
Yes, LM324KNSR and LM324DR share identical SOP-14 pinouts and electrical pin functions. Both devices follow the standard LM324 quad op amp pin configuration: pins 1–4 and 5–8 for inputs/outputs of amplifiers 1–2, pins 9–12 for amplifiers 3–4, and pins 4 (VCC+) and 11 (VCC–) for power. No PCB redesign is needed when substituting between these variants.
What thermal considerations apply to LM324KNSR in SOP-14 package?
LM324KNSR in NS (SOP-14) package has a junction-to-ambient thermal resistance (RθJA) of 90.4°C/W. At maximum quiescent current (300 µA per amplifier × 4 = 1.2 mA) and 36V supply, worst-case power dissipation is ~43 mW, resulting in ~3.9°C junction rise above ambient. Adequate copper pour and minimal trace length on VCC/V– lines ensure safe operation without heatsinking in typical consumer applications.
LM324KNSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.209", 5.30mm 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LM324KNSR FAQ
1.How can I place an order for LM324KNSR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM324KNSR 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 LM324KNSR reliable?
The price and inventory of LM324KNSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM324KNSR is usually 5 days.
3.What payment methods are accepted for LM324KNSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM324KNSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM324KNSR?
LM324KNSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM324KNSR 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 LM324KNSR?
For technical support, including LM324KNSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM324KNSR requirements.
6.How does Aetrix verify that LM324KNSR is sourced from the original manufacturer or authorized distributors?
All LM324KNSR 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 LM324KNSR meets industry standards.
7.What is the process for return or replacement of LM324KNSR?
All LM324KNSR units undergo pre-shipment inspection (PSI). If there is an issue with LM324KNSR, 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 LM324KNSR part is unused and in its original packaging.
Return procedure for LM324KNSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM324KNSR Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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