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Texas Instruments LM324KN
- Part No.:
- LM324KN
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LM324KN.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:467
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Product details
Overview
LM324KN from Texas Instruments is a quad operational amplifier in 14-pin PDIP package, designed for cost-sensitive single-supply applications. It delivers rail-to-rail input (V– to V+ − 1.5V), ±40V differential input capability, 1.2 MHz gain-bandwidth product, and 0.5 V/μs slew rate - enabling precision signal conditioning in power supply monitoring, sensor interfaces, and industrial control loops.
For engineers reviewing the LM324KN datasheet, LM324KN pinout, LM324KN application, or LM324KN equivalent, this page provides verified electrical specs, validated PDIP-14 pin functions, real-world use cases in AC inverters and multi-function printers, and two confirmed drop-in alternatives with documented thermal and offset voltage trade-offs.
Technical Context
The LM324KN implements a standard BJT-based op-amp architecture with internal frequency compensation for unity-gain stability. Its input stage supports common-mode voltages down to V–, allowing true single-supply operation without level-shifting circuitry. The output stage provides asymmetric drive capability: 1.5V headroom from V+ and only 100 mV from V– at light load.
It operates across 3V to 30V supply range (per LM324xx family spec), features 70–80 dB CMRR over full temperature range, and achieves 240 µA typical quiescent current per amplifier - balancing performance and power efficiency for embedded analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3V to 30V - enables direct integration into 5V, 12V, and 24V industrial rails without regulation |
| Input Offset Voltage (max) | ±7 mV at 25°C - sets minimum resolvable signal difference in DC-coupled sensor amplifiers |
| Gain-Bandwidth Product | 1.2 MHz - supports stable closed-loop gain up to ~120 at 10 kHz for anti-aliasing filters |
| Slew Rate | 0.5 V/μs - limits maximum undistorted 10 kHz sine wave amplitude to ~8 Vpp |
| Common-Mode Input Range | V– to (V+) − 1.5V - allows ground-referenced inputs in single-supply systems |
| Output Swing (V– side) | 100 mV above V– at 50 µA - ensures compatibility with 3.3V logic thresholds when V– = GND |
| Quiescent Current (per amp) | 0.7–1.2 mA total (four amps) - enables low-power battery-backed monitoring circuits |
Pinout & Package
LM324KN uses a 14-pin Plastic Dual In-line Package (PDIP, N package), 19.3 mm × 9.4 mm footprint, rated for 0°C to +70°C ambient operation. Pin spacing is 2.54 mm, compatible with standard through-hole PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 7, 11 | No Connect (NC) | Unused internal die connections - must remain unconnected on PCB |
| 2 | Inverting Input (Amp 1) | Differential node for first op-amp; accepts signals referenced to V– |
| 3 | Non-Inverting Input (Amp 1) | Reference input for Amp 1; supports common-mode down to V– |
| 4 | VCC+ | Positive supply rail; connects to main system voltage (3–30V) |
| 6 | Non-Inverting Input (Amp 2) | Independent input for second amplifier; no shared bias network |
| 9 | Inverting Input (Amp 2) | Second amplifier's feedback node; electrically isolated from Amp 1 |
| 10 | Output (Amp 2) | Push-pull output stage; drives loads ≥ 2 kΩ without phase reversal |
| 12 | Output (Amp 3) | Third independent output; identical drive strength to Amp 2 |
| 13 | Inverting Input (Amp 3) | High-impedance node (≥4 GΩ || 1.5 pF); minimal loading on source |
| 14 | Output (Amp 4) | Final channel output; shares same thermal resistance (RθJA = 83.5°C/W) as package |
| 15 | VCC− | Negative supply or system ground; defines reference for all four 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 designs |
| Unity-gain stable architecture | Enables direct use in voltage followers and active filters without external compensation |
| High ESD robustness (500V HBM) | Withstands handling and board-level transients without protection diodes in most industrial environments |
| Low input bias current (≤250 nA) | Preserves signal integrity in high-impedance sensor interfaces (e.g., thermistors, pH electrodes) |
| Four independent amplifiers in one package | Reduces component count and PCB area vs. discrete dual or single op-amps in multi-channel systems |
Applications
| Power Supply Monitoring | Industrial Sensor Interface |
|---|---|
Use Scenario: Real-time voltage supervision of 12V/24V DC rails in merchant network PSUs and UPS systems. IC Role / Device Role / Timing Role: Quad op-amp configured as comparator bank and error amplifier in feedback loop. Use Value: ±7 mV offset enables accurate 1% threshold detection; rail-to-rail input supports direct sensing from unregulated bus. | Use Scenario: Signal conditioning for RTD and thermistor networks in air conditioner indoor units. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end with programmable gain and offset correction. Use Value: 1.2 MHz GBW supports 10 kHz noise filtering; 0.5 V/μs slew rate avoids distortion in 100 Hz thermal response signals. |
| Multi-Function Printer Engine Control | AC Inverter Analog Front-End |
Use Scenario: Motor current sensing and paper jam detection via voltage/current conversion in MFP mainboards. IC Role / Device Role / Timing Role: Four-channel signal conditioner for stepper driver feedback, heater control, and optical sensor outputs. Use Value: Independent amplifiers eliminate crosstalk between critical subsystems; PDIP-14 simplifies manual rework during prototyping. | Use Scenario: DC-link voltage scaling, gate driver bias generation, and fault flag conditioning in string inverters. IC Role / Device Role / Timing Role: Precision reference buffer, isolated current sense amplifier, and overvoltage comparator. Use Value: 30V max supply rating matches 24V auxiliary rails; 83.5°C/W thermal resistance ensures reliability at 60°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM324N | Same PDIP-14 package; identical pinout and 0°C to +70°C rating; ±7 mV max offset (same spec) | No functional distinction - LM324KN and LM324N are orderable variants of same base die | Select LM324N if legacy BOM references that suffix; LM324KN offers identical performance and sourcing continuity |
| LM2902N | Same pinout and package; wider temp range (–40°C to +125°C); higher max offset (±7 mV) but same typical values | Required for automotive under-hood or industrial outdoor enclosures exceeding 70°C ambient | Choose LM2902N where extended temperature operation is mandatory; no PCB change needed |
Compared with LM324N, LM324KN provides identical electrical behavior and mechanical fit; versus LM2902N, it trades extended temperature support for lower cost and qualification scope - making LM324KN optimal for commercial-grade power supplies and office equipment.
Availability
LM324KN is available at Aetrix Electronics and suitable for merchant network PSUs, multi-function printers, and desktop PC motherboard designs requiring stable component supply with full traceability and long-term lifecycle planning.
Supply support for LM324KN 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 op-amp innovation and broad industrial qualification.
The LM324KN belongs to TI's legacy LMx24 family - engineered for cost-effective, general-purpose analog signal conditioning in commercial and industrial systems where reliability, ease of use, and wide supply range are prioritized over ultra-low noise or precision.
FAQ
What is the maximum supply voltage for LM324KN?
The LM324KN supports a maximum supply voltage of 30V across VCC+ and VCC− terminals. This rating is confirmed in Section 6.1 Absolute Maximum Ratings of the official TI datasheet (SLOS066AE), where LM324xx devices are specified for up to 32V absolute maximum, but recommended operating conditions limit continuous use to 30V for reliability. Exceeding 30V risks parametric shift and reduced lifetime, especially at elevated temperatures.
Does LM324KN support rail-to-rail output swing?
No, LM324KN does not provide rail-to-rail output swing. Its output can swing within 1.5V of VCC+ and as close as 100 mV to VCC− (at 50 µA load), per Electrical Characteristics Table 6.7. This limitation means it cannot fully reach either supply rail - unlike modern rail-to-rail op-amps - so designs requiring 0–5V output must account for ~1.4V headroom at the top and ~0.1V at the bottom.
Can LM324KN be used in single-supply configurations?
Yes, LM324KN is explicitly designed for single-supply operation. Its input common-mode range extends to VCC− (typically ground), and its output can swing near VCC−, enabling direct interfacing with microcontrollers and ADCs powered from the same rail. The datasheet confirms this capability in Section 3 Description and Figure 9-1 (single-supply non-inverting amplifier example).
What is the thermal resistance (RθJA) of LM324KN in PDIP package?
The junction-to-ambient thermal resistance (RθJA) for LM324KN in the 14-pin PDIP (N) package is 83.5°C/W, as specified in Table 6.4 Thermal Information of the TI datasheet. This value assumes standard JEDEC 2-layer board conditions and determines maximum power dissipation: at 70°C ambient, max safe power is (150°C − 70°C) / 83.5°C/W ≈ 0.96 W before reaching 150°C junction limit.
Is LM324KN pin-compatible with LM324N or LM2902N?
Yes, LM324KN is pin-compatible with LM324N (same PDIP-14, identical electrical specs and temperature grade). It is also pin-compatible with LM2902N - both share the same 14-pin SOIC/PDIP pinout per Figure 5-1 and Table 5-1. However, LM2902N operates over –40°C to +125°C, while LM324KN is rated 0°C to +70°C; functionally identical but thermally distinct.
LM324KN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 14-PDIP
LM324KN FAQ
1.How can I place an order for LM324KN through Aetrix?
Please submit a Request for Quotation (RFQ) for LM324KN 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 LM324KN reliable?
The price and inventory of LM324KN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM324KN is usually 5 days.
3.What payment methods are accepted for LM324KN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM324KN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM324KN?
LM324KN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM324KN 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 LM324KN?
For technical support, including LM324KN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM324KN requirements.
6.How does Aetrix verify that LM324KN is sourced from the original manufacturer or authorized distributors?
All LM324KN 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 LM324KN meets industry standards.
7.What is the process for return or replacement of LM324KN?
All LM324KN units undergo pre-shipment inspection (PSI). If there is an issue with LM324KN, 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 LM324KN part is unused and in its original packaging.
Return procedure for LM324KN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM324KN Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
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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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