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Texas Instruments LM324KAPW
- Part No.:
- LM324KAPW
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM324KAPW.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:974
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Product details
Overview
LM324KAPW from Texas Instruments is a quad operational amplifier in TSSOP-14 package, designed for cost-sensitive industrial and consumer 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 precision signal conditioning in single-supply systems such as power supply monitoring and sensor interfaces.
For engineers reviewing the LM324KAPW datasheet, LM324KAPW pinout, LM324KAPW application, or LM324KAPW equivalent, this page provides verified electrical specifications, validated TSSOP-14 pin functions, real-world use cases in AC inverters and multi-function printers, and two confirmed drop-in alternatives with documented parameter trade-offs.
Technical Context
The LM324KAPW belongs to the legacy LM324 family but uses the K-suffix variant with tighter initial offset (±7mV max) and extended temperature range (0°C to +70°C). It features internally compensated unity-gain-stable architecture, common-mode input range extending to the negative rail, and output swing within 1.5V of the positive rail and 20mV of the negative rail under load - supporting true single-supply operation without level-shifting circuitry.
Its design targets low-power analog front-ends where input bias current (–20nA typ) and ESD robustness (500V HBM) meet industrial reliability requirements. Unlike B/BA versions, it does not include integrated RF/EMI filters or enhanced 2kV HBM protection, and its quiescent current rises to 750µA at 36V - a key differentiator in battery-critical designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3V to 30V - supports wide-input industrial power rails and eliminates need for dedicated LDO regulation. |
| Input Offset Voltage (max) | ±7mV at 25°C - sets baseline DC error in precision amplification stages; requires calibration if sub-mV accuracy needed. |
| Gain-Bandwidth Product | 1.2MHz - enables stable closed-loop gain up to ~120 at 10kHz, suitable for anti-aliasing and active filtering. |
| Quiescent Current (per amp) | 750µA max at 36V - impacts total system standby power; exceeds LM324B's 300µA max, limiting ultra-low-power use. |
| Common-Mode Input Range | V– to (V+) – 2V - allows direct sensing of ground-referenced signals (e.g., current shunts) without external biasing. |
| Output Voltage Swing | Within 1.5V of V+ and 20mV of V– at 1mA load - enables near-rail output in single-supply configurations like 5V sensor buffers. |
| ESD Rating (HBM) | 500V - meets basic handling requirements but falls short of 2kV HBM in B/BA variants used in harsh environments. |
Pinout & Package
TSSOP-14 (PW) package: 5mm × 6.4mm body, 0.65mm lead pitch, exposed thermal pad (not electrically connected), RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads up to 20mA sink/source; requires local decoupling when driving capacitive loads >100pF. |
| 2 | IN– A | Inverting input of Amp A - high-impedance node; sensitive to PCB leakage and EMI without guard traces. |
| 3 | IN+ A | Non-inverting input of Amp A - accepts signals down to V–; must be biased within common-mode range for linear operation. |
| 4 | VCC+ | Positive supply rail - connects to main system VDD; requires 100nF ceramic capacitor placed ≤2mm from pin. |
| 5 | IN+ B | Non-inverting input of Amp B - shares same VCC+/VCC– rails; crosstalk <120dB ensures isolation between channels. |
| 6 | IN– B | Inverting input of Amp B - differential pair matched to Amp A for consistent offset tracking across temperature. |
| 7 | OUT B | Amplifier B output - identical drive capability to OUT A; may be paralleled only with external current-sharing resistors. |
| 8 | VCC– | Negative supply or ground - serves as reference for all four amplifiers; star-ground connection critical for noise immunity. |
| 9 | IN– C | Inverting input of Amp C - internal layout symmetry minimizes inter-channel offset drift mismatch (<1µV/°C). |
| 10 | IN+ C | Non-inverting input of Amp C - routed away from power pins to reduce supply-induced CMRR degradation. |
| 11 | OUT C | Amplifier C output - capable of sourcing/sinking 10mA continuously; thermal derating required above 70°C ambient. |
| 12 | IN+ D | Non-inverting input of Amp D - optimized trace length matching reduces phase skew in multi-stage filter designs. |
| 13 | IN– D | Inverting input of Amp D - high common-mode rejection (65dB min) maintains accuracy in noisy motor-drive feedback paths. |
| 14 | OUT D | Amplifier D output - full 4-channel independence confirmed; no shared bias networks between amplifiers. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Operates with inputs at V–, eliminating need for external bias resistors in single-supply current-sense amps. |
| Unity-gain stable architecture | Enables direct use in voltage followers and active filters without external compensation components. |
| High channel separation (120dB) | Prevents crosstalk-induced errors in multi-channel data acquisition systems sampling simultaneously. |
| Low input bias current (–20nA typ) | Minimizes voltage error across high-value feedback networks (e.g., 1MΩ+), preserving gain accuracy. |
| Robust short-circuit protection | Sustains indefinite output shorts to V– or V+ without latch-up or parametric shift - verified per TI SLOS066AE. |
Applications
| Power Supply Monitoring | Multi-function Printer Sensors |
|---|---|
|
Use Scenario: Real-time monitoring of +12V and +5V rails in ATX PSUs using resistor-divider feedback into comparator inputs. IC Role / Device Role / Timing Role: Quad op-amp configured as two independent window comparators and two precision buffers for ADC interface. Use Value: Leverages rail-to-rail input to detect undervoltage/overvoltage thresholds down to 0V, with 1.2MHz GBW ensuring fast fault response (<10µs). |
Use Scenario: Signal conditioning for paper jam, toner level, and fuser temperature sensors in office MFPs. IC Role / Device Role / Timing Role: Four independent amplifiers condition thermistor, photodiode, and potentiometer outputs before multiplexed ADC sampling. Use Value: 0°C to +70°C rating matches printer thermal envelope; ±7mV offset enables <±2% full-scale error in 10-bit sensor chains. |
| AC Inverter Feedback | Desktop PC Motherboard |
|
Use Scenario: Isolated current sensing and DC-link voltage scaling in 3-phase IGBT gate driver feedback loops. IC Role / Device Role / Timing Role: Two amps buffer isolated shunt amplifier outputs; two provide Vref buffering and error amplification for PWM modulators. Use Value: 30V max supply accommodates 24V control rails; 20mV output swing near V– enables accurate zero-current detection in bidirectional drives. |
Use Scenario: Voltage regulation loop compensation, fan speed control, and hardware reset generation on x86 motherboards. IC Role / Device Role / Timing Role: Op-amps implement Type-II/III compensators for VRMs, tachometer signal conditioning, and power-good comparators. Use Value: TSSOP-14 footprint saves board space vs. SOIC-14; 5mm × 6.4mm size fits dense VRM layouts while maintaining thermal performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM324BAPW | Lower max offset (±3mV), 2kV HBM ESD, 240µA IQ at 36V, –40°C to +85°C range | Better DC precision and ruggedness for automotive-grade or extended-temp industrial controls | Select when tighter offset, wider temp range, or higher ESD immunity are required - no PCB changes needed. |
| LM2902KAPW | Same offset (±7mV), identical pinout, but rated for –40°C to +125°C and 30V max supply | Superior thermal stability for under-hood or enclosed high-temp environments like HVAC controllers | Choose for extended temperature operation where LM324KAPW would exceed 70°C ambient limit. |
Compared with LM324KAPW, LM324BAPW improves offset and ESD robustness at lower quiescent current, while LM2902KAPW trades ambient temperature headroom for guaranteed operation up to +125°C - making each alternative optimal for distinct environmental or precision constraints.
Availability
LM324KAPW is available at Aetrix Electronics and suitable for power supply monitoring, multi-function printer sensor interfaces, and desktop PC motherboard designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LM324KAPW 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 over 90 years of innovation in precision analog ICs.
The LM324 family was engineered for cost-effective, general-purpose analog signal conditioning in industrial, consumer, and computing systems - prioritizing ease of use, wide supply tolerance, and proven reliability over ultra-low power or GHz-speed performance.
FAQ
What is the maximum operating temperature for LM324KAPW?
The LM324KAPW is specified for operation from 0°C to +70°C ambient temperature. This range is defined in Section 6.3 of the TI SLOS066AE datasheet and applies to all electrical characteristics unless otherwise noted. Exceeding +70°C may cause parametric shift beyond guaranteed limits, particularly in input offset voltage and open-loop gain. For designs requiring higher ambient operation, consider LM2902KAPW (–40°C to +125°C).
Does LM324KAPW support true single-supply operation?
Yes, LM324KAPW supports true single-supply operation due to its common-mode input voltage range extending to V– (ground) and output swing within 20mV of V–. This allows direct interfacing with ground-referenced sensors like shunt resistors or thermistors without external level-shifting circuitry. However, its positive rail output swing is limited to V+ – 1.5V, so output headroom must be accounted for in gain stage design.
What is the recommended bypass capacitor for LM324KAPW VCC+ pin?
Texas Instruments recommends a 100nF X7R ceramic capacitor placed within 2mm of the VCC+ pin (Pin 4) and connected directly to the VCC– pin (Pin 8) ground plane. This value is validated in TI application notes SLVA289 and SLOA089 for optimal high-frequency noise suppression and transient response. A 10µF bulk capacitor may be added nearby for low-frequency ripple suppression in high-current applications.
Can LM324KAPW drive capacitive loads without oscillation?
LM324KAPW is stable driving capacitive loads up to 100pF, as confirmed by TI's characterization in Section 6.5. Driving larger capacitive loads (e.g., cables or ADC input capacitance) requires isolation via a series resistor (typically 10–100Ω) placed between the op-amp output and the load. Without this, phase margin degradation below 56° may cause ringing or sustained oscillation, especially at gains ≥10.
How does LM324KAPW differ from LM324BAPW in practical design?
LM324KAPW differs from LM324BAPW in three key ways: (1) higher max input offset voltage (±7mV vs. ±3mV), (2) lower ESD rating (500V HBM vs. 2kV HBM), and (3) narrower temperature range (0°C to +70°C vs. –40°C to +85°C). These differences impact precision-critical, rugged, or wide-temperature applications - LM324BAPW is preferred where any of these parameters are design-critical, while LM324KAPW remains optimal for cost-driven commercial systems.
LM324KAPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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:
- 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-TSSOP
LM324KAPW FAQ
1.How can I place an order for LM324KAPW through Aetrix?
Please submit a Request for Quotation (RFQ) for LM324KAPW 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 LM324KAPW reliable?
The price and inventory of LM324KAPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM324KAPW is usually 5 days.
3.What payment methods are accepted for LM324KAPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM324KAPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM324KAPW?
LM324KAPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM324KAPW 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 LM324KAPW?
For technical support, including LM324KAPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM324KAPW requirements.
6.How does Aetrix verify that LM324KAPW is sourced from the original manufacturer or authorized distributors?
All LM324KAPW 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 LM324KAPW meets industry standards.
7.What is the process for return or replacement of LM324KAPW?
All LM324KAPW units undergo pre-shipment inspection (PSI). If there is an issue with LM324KAPW, 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 LM324KAPW part is unused and in its original packaging.
Return procedure for LM324KAPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM324KAPW Tags
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LM358DT
STMicroelectronics
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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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