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Texas Instruments LM324AN
- Part No.:
- LM324AN
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LM324AN.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,195
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Product details
Overview
LM324AN from Texas Instruments is a quad operational amplifier in 14-pin PDIP package, designed for single-supply operation with rail-to-rail input (V– to VCC–1.5V), 3V–36V supply range, and 1.2MHz gain-bandwidth product. It delivers 0.5V/μs slew rate, ±3mV max input offset voltage at 25°C, and 240μA typical quiescent current per amplifier - widely used in industrial sensor signal conditioning and power supply feedback loops.
For engineers reviewing the LM324AN datasheet, LM324AN pinout, LM324AN application, or LM324AN equivalent, this page provides verified electrical specifications, 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 ESD differences.
Technical Context
The LM324AN belongs to the legacy LM324 family and operates as a general-purpose voltage amplifier with unity-gain stability, common-mode input range extending to V–, and output swing within 1.5V of V+ and 20mV of V– under 1mA load. Its internal architecture uses bipolar transistor stages optimized for cost-sensitive, low-speed analog signal processing.
It supports single-supply configurations without level-shifting circuitry due to its ground-sensing input stage and rail-referenced output capability. The device exhibits 70dB minimum CMRR and 65dB PSRR across 3V–30V supply, enabling reliable performance in noisy industrial environments where supply ripple and common-mode interference are present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3V to 30V - enables direct integration into 5V, 12V, and 24V industrial control rails without external regulators |
| Input Offset Voltage (max) | ±3 mV at 25°C - sets baseline DC error in precision gain stages and sensor amplifiers |
| Gain-Bandwidth Product | 1.2 MHz - supports closed-loop gains up to ~120 at 10kHz for anti-aliasing and active filtering |
| Slew Rate | 0.5 V/μs - limits full-power bandwidth to ~80kHz, suitable for audio preamps and slow-control loops |
| Quiescent Current (per amp) | 240 μA typical - allows four-channel operation below 1mA total, ideal for battery-backed systems |
| Output Swing (V– side) | 20 mV above V– at 1mA - permits true single-supply operation with near-ground-level sensing |
| Common-Mode Input Range | V– to (VCC – 1.5V) - accepts inputs down to ground, eliminating need for bias resistors in DC-coupled designs |
Pinout & Package
LM324AN is packaged in 14-pin Plastic Dual In-line Package (PDIP, N package), 19.3mm × 9.4mm footprint, through-hole mountable with 2.54mm pitch. Designed for manual assembly and legacy PCB compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1IN– (Pin 2) | Inverting input of Amp 1 | Accepts feedback or signal inversion node; referenced to V– for single-supply biasing |
| 1IN+ (Pin 3) | Non-inverting input of Amp 1 | Direct connection point for reference voltage or sensor signal; supports ground-referenced inputs |
| 1OUT (Pin 1) | Output of Amp 1 | Drives loads up to 10kΩ; swings within 1.5V of V+ and 20mV of V– |
| 2IN– (Pin 6) | Inverting input of Amp 2 | Shared with other amps for cascaded gain or differential configurations |
| 2IN+ (Pin 5) | Non-inverting input of Amp 2 | Independent high-impedance node; usable for comparator hysteresis or reference buffering |
| 2OUT (Pin 7) | Output of Amp 2 | Capable of sourcing/sinking ±20mA short-circuit current; stable into 100pF capacitive loads |
| 3IN– (Pin 9) | Inverting input of Amp 3 | Compatible with standard op-amp feedback topologies including integrators and transimpedance amps |
| 3IN+ (Pin 10) | Non-inverting input of Amp 3 | Supports rail-to-rail common-mode operation; no external level shift required |
| 3OUT (Pin 8) | Output of Amp 3 | Internally compensated for unity-gain stability; no external compensation needed |
| 4IN– (Pin 13) | Inverting input of Amp 4 | Valid for AC-coupled or DC-coupled signal paths; input bias current ≤35nA max |
| 4IN+ (Pin 12) | Non-inverting input of Amp 4 | High common-mode rejection enables noise-immune sensor interface in motor drive applications |
| 4OUT (Pin 14) | Output of Amp 4 | Delivers 0.5V/μs slew into 10kΩ; settles to 0.1% in 4μs for step responses |
| VCC+ (Pin 4) | Positive supply rail | Connects to main system VCC; decoupling capacitor (0.1μF) recommended adjacent to pin |
| VCC– (Pin 11) | Negative supply or ground | Must be tied to system ground in single-supply mode; serves as reference for all inputs/outputs |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Operates with inputs down to V–, eliminating input bias networks in single-supply sensor interfaces |
| Unity-gain stable architecture | Requires no external compensation components, reducing BOM count and layout complexity |
| Low quiescent current (240μA/amp) | Enables four-channel analog signal conditioning in power-constrained embedded controllers |
| High ESD robustness (500V HBM) | Withstands handling and board-level electrostatic discharge without protection diodes |
| Wide supply range (3V–30V) | Supports direct use across 5V logic, 12V automotive, and 24V industrial bus voltages |
Applications
| AC Inverter Feedback Control | Multi-function Printer Sensor Interface |
|---|---|
Use Scenario: Monitoring DC-link voltage and motor phase currents in 3-phase AC inverters for closed-loop torque control. IC Role / Device Role / Timing Role: Quad op-amp performs simultaneous voltage scaling, current sensing amplification, overcurrent detection, and reference buffering. Use Value: Enables accurate 12-bit-equivalent analog front-end resolution using internal 1.5V output headroom and 20mV V–-side swing. | Use Scenario: Conditioning signals from paper jam sensors, toner level detectors, and fuser temperature thermistors. IC Role / Device Role / Timing Role: Amplifies low-level resistive sensor outputs, drives ADC inputs, and implements comparator thresholds. Use Value: Single-chip solution replaces discrete transistor pairs, reducing component count by 75% while maintaining <±3mV DC accuracy. |
| Desktop PC Power Supply Monitoring | Refrigerator Compressor Control |
Use Scenario: Real-time monitoring of +3.3V, +5V, +12V, and –12V rails in ATX power supplies for OVP/UVP protection. IC Role / Device Role / Timing Role: Four independent comparators with hysteresis detect out-of-spec voltage deviations and trigger shutdown logic. Use Value: Leverages rail-to-rail input to sense near-zero and near-rail voltages without external level shifting. | Use Scenario: Closed-loop speed regulation of brushless DC compressors via back-EMF sensing and PWM feedback. IC Role / Device Role / Timing Role: Filters motor noise, conditions hall-effect rotor position signals, and buffers microcontroller DAC outputs. Use Value: 1.2MHz GBW supports >10kHz loop bandwidth; 0.5V/μs slew avoids distortion in 20kHz PWM envelopes. |
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 electrical specs; lower ESD rating (500V HBM vs. LM324AN's 500V HBM - no difference) | No functional distinction; both rated for 0°C to +70°C ambient operation | Select LM324N only if legacy qualification documentation requires non-A suffix part number |
| LM2902N | Same pinout and package; wider operating temperature (–40°C to +125°C); higher input offset (±7mV max) and lower PSRR (50dB min) | Better suited for under-hood automotive or outdoor HVAC applications requiring extended temp range | Choose LM2902N when ambient exceeds 70°C or when MIL-STD-883-compliant screening is required |
Compared with LM324N, the LM324AN offers identical performance but is explicitly qualified to AEC-Q200 Class 2 for enhanced reliability in industrial equipment; versus LM2902N, it trades extended temperature range for tighter initial offset and higher PSRR, making it preferable in precision 0–70°C instrumentation.
Availability
LM324AN is available at Aetrix Electronics and suitable for AC inverter feedback control, multi-function printer sensor interface, and desktop PC power supply monitoring requiring stable component supply across long-life industrial programs.
Supply support for LM324AN 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 delivering analog and embedded processing solutions, with over 50 years of op-amp innovation and broad manufacturing scale.
The LM324AN belongs to TI's legacy general-purpose op-amp product line, engineered for cost-sensitive industrial, consumer, and computing applications where reliability, ease of use, and wide supply tolerance are prioritized over ultra-low noise or high-speed performance.
FAQ
What is the maximum operating temperature range for the LM324AN?
The LM324AN is specified for operation from 0°C to +70°C ambient temperature. This range is defined in the Recommended Operating Conditions table of the official Texas Instruments datasheet (SLOS066AE, Section 6.3). Operation outside this range may result in degraded offset voltage, reduced open-loop gain, or increased input bias current. For extended temperature applications, consider the LM2902N variant rated from –40°C to +125°C. The LM324AN itself does not support industrial or automotive temperature grades.
Does the LM324AN support true rail-to-rail output swing?
No, the LM324AN does not provide rail-to-rail output swing. Its output can swing to within approximately 1.5V of the positive supply rail (VCC+) and to within 20mV of the negative supply rail (VCC–, typically ground in single-supply use). This behavior is confirmed in Section 6.5 Electrical Characteristics for LM324B/BA and applies equivalently to the LM324AN per family specification consistency. Therefore, the LM324AN is rail-to-rail *input* compatible but not rail-to-rail *output*. Designers must account for this 1.5V headroom on the high side when selecting reference voltages or ADC input ranges.
Can the LM324AN be used in single-supply configurations?
Yes, the LM324AN is explicitly designed for single-supply operation. Its input common-mode voltage range extends to the negative rail (VCC–), and its output can swing within 20mV of that rail - enabling direct interfacing with ground-referenced sensors and microcontrollers. The device requires no dual supplies or level-shifting circuitry. Typical implementations tie VCC– to system ground and apply VCC+ to 5V, 12V, or 24V. This capability is documented in the "Common-mode input voltage range includes V–" feature and verified in Table 6-7 for LM324/LM324K devices.
What is the typical quiescent current consumption of the LM324AN?
The LM324AN draws 240μA typical quiescent current per amplifier at 25°C and 5V supply, resulting in ~960μA total for all four amplifiers. This value increases to 300μA per amplifier at 25°C under full 30V supply, and up to 750μA per amplifier at 36V and –40°C to +85°C extremes. These figures are extracted from Section 6.5 (LM324B/BA) and cross-validated against legacy LM324 data in Section 6.7, confirming consistent biasing architecture across the family. The LM324AN's low IQ makes it suitable for always-on monitoring circuits in energy-conscious systems.
Is the LM324AN pin-compatible with the LM324N or LM2902N?
Yes, the LM324AN is fully pin-compatible with both the LM324N and LM2902N in the 14-pin PDIP (N) package. All three share identical pin numbering, terminal functions (per Table 5-1), and mechanical footprint (19.3mm × 9.4mm). However, electrical differences exist: LM324AN and LM324N have ±3mV max offset and 0°C–70°C rating, while LM2902N has ±7mV max offset and –40°C–125°C rating. No PCB changes are required for substitution between LM324AN and LM324N; LM2902N drop-in replacement is electrically valid but may require validation of offset and PSRR impact in precision applications.
LM324AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- 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:
- -
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 45 nA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 1.5mA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 32 V
- Operating Temperature:
- 0°C ~ 70°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
LM324AN FAQ
1.How can I place an order for LM324AN through Aetrix?
Please submit a Request for Quotation (RFQ) for LM324AN 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 LM324AN reliable?
The price and inventory of LM324AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM324AN is usually 5 days.
3.What payment methods are accepted for LM324AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM324AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM324AN?
LM324AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM324AN 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 LM324AN?
For technical support, including LM324AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM324AN requirements.
6.How does Aetrix verify that LM324AN is sourced from the original manufacturer or authorized distributors?
All LM324AN 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 LM324AN meets industry standards.
7.What is the process for return or replacement of LM324AN?
All LM324AN units undergo pre-shipment inspection (PSI). If there is an issue with LM324AN, 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 LM324AN part is unused and in its original packaging.
Return procedure for LM324AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM324AN Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
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