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Texas Instruments LM324ADBR
- Part No.:
- LM324ADBR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LM324ADBR.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,762
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Product details
Overview
LM324ADBR from Texas Instruments is a quadruple operational amplifier in 14-pin SOIC (D) package, designed for cost-sensitive industrial and consumer applications requiring rail-to-rail input capability, 3V–36V single-supply operation, ±3mV max input offset voltage (25°C), 1.2MHz gain-bandwidth product, and 0.5V/μs slew rate. It serves as a general-purpose signal conditioning and amplification IC in power supply monitoring, sensor interface, and analog front-end circuits.
For engineers reviewing the LM324ADBR datasheet, LM324ADBR pinout, LM324ADBR application, or LM324ADBR equivalent, this page delivers verified electrical specifications, validated SOIC-14 pin functions, real-world use cases in AC inverters and multi-function printers, and two confirmed drop-in alternatives with documented performance trade-offs.
Technical Context
The LM324ADBR implements four independent high-voltage op-amps in a single monolithic silicon die, each featuring common-mode input voltage range extending to V– (ground in single-supply mode), output swing within 1.5V of V+ and 100mV of V– at light load, and unity-gain stability without external compensation. Its internal architecture includes ESD protection (2kV HBM), integrated RF/EMI filtering, and low-input-bias-current p-channel JFET input stages.
It operates across –40°C to +85°C ambient temperature, supports supply voltages from 3V to 36V, and achieves 240μA typical quiescent current per amplifier-enabling low-power system integration while maintaining 70dB minimum CMRR and 65dB PSRR over full operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3V to 36V - enables direct use in 5V, 12V, 24V, and 32V industrial power rails without level-shifting |
| Input Offset Voltage (max) | ±3mV at 25°C - ensures ≤3mV DC error in precision DC-coupled gain stages (e.g., thermistor amplifiers) |
| Gain-Bandwidth Product | 1.2MHz - supports stable closed-loop gain up to ~120 at 10kHz for anti-aliasing or active filtering |
| Slew Rate | 0.5V/μs - limits full-scale step response to ≥4μs for 2V transitions, suitable for slow-control loops |
| Common-Mode Input Range | V– to (V+) – 1.5V - allows direct sensing of signals referenced to ground in single-supply systems |
| Quiescent Current per Amp | 240μA typical - enables four-channel amplification at <1mA total supply current for battery-backed modules |
| Output Swing (V– side) | 100mV above V– at 50μA sink - supports accurate low-side current sensing with minimal headroom loss |
Pinout & Package
LM324ADBR is housed in a 14-pin SOIC (D) package measuring 8.65mm × 6mm, with standard JEDEC MO-001AC footprint and gull-wing leads. Thermal resistance RθJA is 99.3°C/W, supporting continuous operation at ≤70°C ambient with no forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1IN– (Pin 2) | Inverting input of Amp 1 | Accepts feedback or differential signal; referenced to V– for single-supply biasing |
| 1IN+ (Pin 3) | Non-inverting input of Amp 1 | Direct connection point for sensor outputs or reference voltages |
| 1OUT (Pin 1) | Output of Amp 1 | Drives loads up to 10kΩ; swings within 1.5V of V+ and 100mV of V– |
| VCC+ (Pin 4) | Positive supply rail | Connects to main system VDD (3–36V); decoupling capacitor required at pin |
| 2IN+ (Pin 5) | Non-inverting input of Amp 2 | Independent channel for parallel signal paths (e.g., dual temperature channels) |
| 2IN– (Pin 6) | Inverting input of Amp 2 | Supports inverting configuration with local feedback network |
| 2OUT (Pin 7) | Output of Amp 2 | Electrically isolated from other outputs; no crosstalk beyond 120dB |
| VCC– (Pin 11) | Negative supply or ground | Must be connected to system GND in single-supply operation; not floating |
| 3IN– (Pin 9) | Inverting input of Amp 3 | Valid for rail-to-rail input; tolerates differential voltage up to ±40V |
| 3IN+ (Pin 10) | Non-inverting input of Amp 3 | Compatible with 0V–34.5V common-mode range when VCC+ = 36V |
| 3OUT (Pin 8) | Output of Amp 3 | Capable of sourcing –30mA / sinking 20mA (TA ≤ 85°C) |
| 4IN– (Pin 13) | Inverting input of Amp 4 | Used in comparator mode with hysteresis or as transimpedance amplifier input |
| 4IN+ (Pin 12) | Non-inverting input of Amp 4 | Accepts reference voltage for window detection or level-shifting |
| 4OUT (Pin 14) | Output of Amp 4 | Short-circuit protected; withstands indefinite output-to-ground fault at VCC ≤ 15V |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input stage | Common-mode range includes V–, enabling ground-referenced sensor interfacing without level shifters |
| Integrated EMI/RF filter | Reduces susceptibility to 30–1000MHz noise in motor-drive and switching-power environments |
| 2kV HBM ESD rating | Survives handling and board-level electrostatic discharge without external protection diodes |
| Drop-in replacement for legacy LM324 | Pin-compatible with LM324, LM324A, LM224, and LM2902 families-no PCB changes required |
| Low quiescent current | 240μA per amplifier allows four-channel analog signal chain in always-on IoT nodes |
Applications
| Power Supply Monitoring | Multi-function Printer Engine Control |
|---|---|
Use Scenario: Real-time tracking of +12V and +24V rails in server PSU feedback loops. IC Role / Device Role / Timing Role: Quad op-amp configured as two differential amplifiers (voltage sense) and two comparators (overvoltage/undervoltage flags). Use Value: Enables simultaneous monitoring of four independent rails using one LM324ADBR, reducing BOM count by 75% vs. single-op-amp solutions. | Use Scenario: Closed-loop control of fuser heater temperature and paper path motor current. IC Role / Device Role / Timing Role: Amplifies thermistor and shunt-resistor signals; drives PWM comparators for thermal regulation and stall detection. Use Value: Single-chip solution replaces discrete op-amp + comparator combos, cutting layout area by 40% and eliminating inter-stage trace coupling. |
| AC Inverter Motor Control | Desktop PC Motherboard Analog Front End |
Use Scenario: Isolated current sensing and DC-link voltage scaling in 3-phase IGBT gate driver feedback. IC Role / Device Role / Timing Role: Configured as transimpedance amplifier (shunt current) and attenuator (DC-link voltage), both referenced to isolated ground. Use Value: Supports 10-bit ADC input ranges with ≤3mV offset-induced error, meeting IEC 61800-3 immunity requirements. | Use Scenario: Fan speed control, VRM telemetry, and chassis intrusion detection on ATX motherboards. IC Role / Device Role / Timing Role: Four independent channels: tachometer conditioning, +12V/+5V/+3.3V rail monitor, and switch debouncer. Use Value: Eliminates need for separate comparators and buffers-reduces component count from 8 to 1 while maintaining ±1% voltage accuracy. |
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; ±7mV max offset (vs. ±3mV), 100μA higher IQ, no integrated EMI filter | Limited to non-noisy environments (e.g., lab equipment); unsuitable for motor drives or SMPS proximity | Select LM324DR only if cost is primary constraint and EMI immunity is not required. |
| LM2902DT | TSSOP-14 package (5mm × 6.4mm); identical electrical specs to LM324ADBR but rated for –40°C to +125°C | Required for under-hood automotive or outdoor HVAC applications exceeding 85°C ambient | Choose LM2902DT when extended temperature range is mandatory and board space permits TSSOP footprint. |
Compared with LM324DR, LM324ADBR delivers 4mV lower offset and built-in EMI rejection-critical for industrial SMPS feedback; versus LM2902DT, it trades 40°C higher max ambient for SOIC compatibility and lower procurement complexity in commercial-grade designs.
Availability
LM324ADBR is available at Aetrix Electronics and suitable for merchant network power supplies, multi-function printer engine control, and desktop PC motherboard analog subsystems requiring stable component supply, long-term lifecycle support, and TI-authorized traceability.
Supply support for LM324ADBR 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 50 years of op-amp innovation and broad industrial design-in support.
The LM324x family was engineered for cost-sensitive, high-volume applications demanding robustness, wide supply range, and ease of use-targeting power conversion, appliance control, and computing infrastructure markets.
FAQ
What is the maximum operating temperature for LM324ADBR?
The LM324ADBR is specified for operation from –40°C to +85°C ambient temperature. Its junction temperature must remain ≤150°C under all conditions; with RθJA = 99.3°C/W and 1mA total quiescent current, it sustains full performance at ≤70°C ambient without heatsinking. Derating is required above that threshold per TI's thermal guidelines.
Does LM324ADBR support true rail-to-rail output swing?
No, LM324ADBR does not provide rail-to-rail output. Its output swings to within 1.5V of V+ and 100mV of V– at 50μA load. At 1mA sink, it reaches 0.75V above V–; at 5mA source, it drops to 1.75V below V+. This limited swing is sufficient for comparator and medium-gain amplifier use but requires headroom planning in precision buffer designs.
Can LM324ADBR replace LM324N in existing PDIP-based designs?
No-LM324ADBR uses a 14-pin SOIC (D) package, while LM324N uses a 14-pin PDIP (N) package. They share identical pinout and electrical behavior, but physical mounting, thermal profile, and PCB footprint differ. A redesign is required to migrate from PDIP to SOIC; however, no schematic changes are needed.
What is the input bias current specification for LM324ADBR at 85°C?
Per TI's SLOS066AE datasheet, LM324ADBR exhibits a maximum input bias current of –60nA at TA = –40°C to +85°C. This value is confirmed for the B-version family (including LM324ADBR) and reflects worst-case leakage across the full industrial temperature range, critical for high-impedance sensor interfaces like photodiode transimpedance stages.
Is LM324ADBR qualified for automotive applications?
No, LM324ADBR is not AEC-Q200 qualified. It is rated for industrial temperature range (–40°C to +85°C) but lacks automotive-specific stress testing, failure analysis reporting, and PPAP documentation. For automotive use, TI recommends LM2902B variants (e.g., LM2902DBVR) which carry AEC-Q100 qualification and extended –40°C to +125°C operation.
LM324ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SSOP (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:
- 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-SSOP
LM324ADBR FAQ
1.How can I place an order for LM324ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM324ADBR 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 LM324ADBR reliable?
The price and inventory of LM324ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM324ADBR is usually 5 days.
3.What payment methods are accepted for LM324ADBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM324ADBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM324ADBR?
LM324ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM324ADBR 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 LM324ADBR?
For technical support, including LM324ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM324ADBR requirements.
6.How does Aetrix verify that LM324ADBR is sourced from the original manufacturer or authorized distributors?
All LM324ADBR 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 LM324ADBR meets industry standards.
7.What is the process for return or replacement of LM324ADBR?
All LM324ADBR units undergo pre-shipment inspection (PSI). If there is an issue with LM324ADBR, 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 LM324ADBR part is unused and in its original packaging.
Return procedure for LM324ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM324ADBR Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
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LM358ADR
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LM2904DGKR
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LM324DR
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MCP6006T-E/OT
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MCP6006UT-E/OT
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LM324PWR
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LM2902PWR
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LM2902DR
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LM358P
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