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Texas Instruments LP324M/NOPB
- Part No.:
- LP324M/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP324M/NOPB.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:845
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Product details
Overview
LP324M/NOPB from Texas Instruments is a micropower quad operational amplifier optimized for battery-powered systems, featuring 85 μA typical supply current, 2 mV typical input offset voltage, and rail-to-ground input common-mode range. It operates from 3 V to 32 V single supply and interfaces directly with CMOS logic in portable instrumentation and sensor signal conditioning.
For engineers reviewing the LP324M/NOPB datasheet, LP324M/NOPB pinout, LP324M/NOPB application, or LP324M/NOPB equivalent, key selection criteria include ultra-low quiescent current, ground-sensing input capability, single-supply operation up to 32 V, and pin compatibility with LM324 for drop-in replacement in legacy designs.
Technical Context
The LP324M/NOPB integrates four independent, internally compensated op-amps with class-B output stages enabling both sourcing and sinking of output current. Its input stage supports common-mode voltages down to ground, eliminating need for input biasing in single-supply configurations.
It delivers 100 kHz gain-bandwidth product and 50 V/ms slew rate, optimized for DC-critical, low-power applications rather than high-speed AC performance. The device exhibits 90 dB typical CMRR and PSRR, ensuring stable operation under varying supply and common-mode conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 32 V single supply - enables direct use in 5 V, 12 V, and 24 V industrial/battery systems without regulation |
| Quiescent Current (per amp) | 85 μA typ - reduces total system power by >90% vs. LM324, extending battery life in portable devices |
| Input Offset Voltage | 2 mV typ - ensures accurate DC amplification in precision sensor front-ends and low-level signal conditioning |
| Input Bias Current | 2 nA typ - minimizes voltage error across high-impedance sources like photodiodes or pH electrodes |
| Input Common-Mode Range | 0 V to V+ −1.5 V - allows direct connection of grounded sensors or transducers without level-shifting circuitry |
| Output Swing (RL = 10 kΩ) | 3.6 V min (low), V+−1.9 V max - provides usable dynamic range near supply rails in single-supply configurations |
| Gain-Bandwidth Product | 100 kHz - sufficient for DC–10 kHz signal paths including temperature, pressure, and strain measurement |
Pinout & Package
LP324M/NOPB is housed in a 14-pin SOIC (D) package, 8.75 mm × 4.0 mm footprint, 1.75 mm max height, RoHS-compliant matte tin lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Amplifier A Output | Drives external load; class-B stage sinks/sourses up to 10 mA source / 5 mA sink under specified conditions |
| 2 | Amplifier A Inverting Input | Accepts feedback network; adjacent to Pin 1 for compact PCB layout of inverting configurations |
| 3 | Amplifier A Non-Inverting Input | High-impedance node (2 nA bias); supports direct grounding or sensor connection |
| 4 | V− (GND) | Ground reference for all amplifiers; input common-mode extends to this pin |
| 5 | Amplifier B Non-Inverting Input | Independent high-Z input; usable for differential sensing or reference buffering |
| 6 | Amplifier B Inverting Input | Paired with Pin 7 output for minimal trace length in closed-loop designs |
| 7 | Amplifier B Output | Second output; placed at corner for easy routing to connectors or ADC inputs |
| 8 | V+ | Positive supply rail; accepts 3–32 V; decoupling capacitor recommended near this pin |
| 9 | Amplifier C Inverting Input | Third amplifier input; layout symmetry supports multi-channel signal processing |
| 10 | Amplifier C Non-Inverting Input | Supports biasing to mid-supply or direct sensor interface |
| 11 | Amplifier C Output | Third output; positioned at corner for low-inductance routing |
| 12 | Amplifier D Non-Inverting Input | Fourth independent input; enables quad-function integration (e.g., signal + reference + filter + comparator) |
| 13 | Amplifier D Inverting Input | Paired with Pin 14; facilitates hysteresis or feedback networks |
| 14 | Amplifier D Output | Fourth output; completes quad functionality with consistent drive capability |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-ground input common-mode range | Enables direct interfacing with grounded sensors (e.g., thermocouples, RTDs) without level-shifting components |
| 85 μA per amplifier supply current | Reduces total quiescent draw to <350 μA for full quad, critical for coin-cell or energy-harvesting applications |
| Pin-for-pin compatibility with LM324 | Allows direct replacement in existing designs without PCB revision, preserving layout and BOM continuity |
| CMOS logic interface capability | Output swing reaches within 0.7 V of GND and 1.9 V below V+, enabling reliable driving of 5 V or 3.3 V logic thresholds |
| Stable operation with 50–1000 pF capacitive loads | Eliminates need for isolation resistors when driving ADC inputs, LCD drivers, or long traces |
Applications
| Portable Gas Sensor Front-End | Battery-Powered Data Logger |
|---|---|
Use Scenario: Amplifying low-level mV outputs from electrochemical gas sensors powered by Li-ion cells. IC Role / Device Role / Timing Role: Quad op-amp performs sensor biasing, transimpedance conversion, filtering, and reference buffering in one package. Use Value: 85 μA per amplifier extends 2000 mAh battery life to >2 years in sleep-active cycling, while rail-to-ground input accommodates sensor's grounded working electrode. | Use Scenario: Signal conditioning and multiplexed analog acquisition in environmental monitoring nodes deployed remotely. IC Role / Device Role / Timing Role: Four channels condition thermistor, humidity, pressure, and light sensor outputs before ADC sampling. Use Value: Single 3–32 V supply simplifies power architecture; low input bias current prevents drift in high-impedance thermistor bridges. |
| Industrial 4–20 mA Loop Receiver | Low-Power Medical Pulse Oximeter Analog Front-End |
Use Scenario: Converting 4–20 mA loop current to ground-referenced voltage in PLC I/O modules. IC Role / Device Role / Timing Role: One amplifier acts as precision I-to-V converter; others buffer and scale output for isolation or DAC interface. Use Value: Input common-mode to GND allows direct shunt connection; 2 mV offset ensures ≤0.1% full-scale error in 16-bit systems. | Use Scenario: Amplifying and filtering weak red/IR photodiode signals in wearable pulse oximeters powered by CR2032 batteries. IC Role / Device Role / Timing Role: Two amplifiers handle transimpedance gain; third filters ambient noise; fourth buffers for ADC input. Use Value: 2 nA input bias current avoids loading high-impedance photodiodes; ultra-low supply current enables >72-hour continuous operation. |
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 | Higher 1.5 mA supply current per amp; 7 mV max offset; no guaranteed ground-sensing input | Preferred where speed (1.2 MHz GBW) or cost outweighs power sensitivity; unsuitable for sub-μA standby systems | Select LM324DR only if AC performance or legacy qualification drives requirement - not for new ultra-low-power designs |
| TLV2464CDR | Lower 220 μA supply current; rail-to-rail input/output; 3.5 mV max offset; 6.4 V max supply | Required for rail-to-rail output swing or dual-supply ±1.65 V operation; incompatible with >6.4 V supplies | Choose TLV2464CDR when full rail-to-rail swing is mandatory and supply stays ≤6.4 V - otherwise LP324M/NOPB offers wider voltage range and lower IQ |
Compared with LM324DR and TLV2464CDR, LP324M/NOPB uniquely balances ultra-low 85 μA quiescent current, 32 V supply tolerance, and guaranteed ground-sensing input - making it the optimal choice for battery-backed industrial sensors and portable instrumentation where power, voltage range, and DC accuracy are jointly constrained.
Availability
LP324M/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery backup equipment, and industrial 4–20 mA loop receivers requiring stable component supply and long-term manufacturability.
Supply support for LP324M/NOPB 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, embedded processing, and connectivity solutions with emphasis on reliability, scalability, and broad application support.
The LP324M/NOPB belongs to TI's micropower operational amplifier product line, engineered specifically for battery-operated and energy-constrained systems requiring precision DC performance with minimal supply current.
FAQ
What is the operating temperature range for LP324M/NOPB?
The LP324M/NOPB is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with its intended use in portable consumer and industrial equipment where extreme temperature resilience is not required. The SOIC (D) package has a θJA of 140°C/W, supporting thermal design within this envelope when power dissipation remains below 300 mW. Always verify junction temperature using TJ = TA + θJA × PD in final layout.
Does LP324M/NOPB support true single-supply operation with input signals at ground?
Yes, LP324M/NOPB supports true single-supply operation with input common-mode voltage extending to GND (0 V). This is explicitly guaranteed in the datasheet and enables direct connection of grounded sensors such as thermocouples or bridge transducers without level-shifting circuitry. The input stage remains linear and functional at 0 V input, unlike many older op-amps that require ≥1.5 V headroom below V+.
Is LP324M/NOPB pin-compatible with LM324?
Yes, LP324M/NOPB is pin-for-pin compatible with LM324 in SOIC, PDIP, and TSSOP packages. The pinout, footprint, and terminal functions match exactly - allowing direct replacement in existing LM324-based designs. However, note that LP324M/NOPB draws significantly less supply current (85 μA vs. 1.5 mA per amp) and has different AC performance (100 kHz GBW vs. 1.2 MHz), so AC-critical circuits may require validation.
What is the maximum capacitive load LP324M/NOPB can drive without instability?
LP324M/NOPB is designed to remain stable driving capacitive loads from 50 pF to 1000 pF without external compensation. This covers typical ADC input capacitance, long PCB traces, and LCD segment drivers. For loads beyond 1000 pF, a small series resistor (10–100 Ω) at the output is recommended to isolate the capacitance and maintain phase margin. The improved stability margin over LM324 eliminates need for output isolation in most data-acquisition applications.
Can LP324M/NOPB be used in dual-supply configurations?
Yes, LP324M/NOPB supports dual-supply operation with ratings up to ±16 V (±32 V total), as confirmed in Absolute Maximum Ratings. When operated symmetrically (e.g., ±15 V), it retains rail-to-ground input capability on the negative rail side, enabling bipolar signal handling. However, its primary design focus is single-supply systems; for dedicated dual-supply precision applications, TI's OPAx344 or TLVx170 families offer better offset and noise specs.
LP324M/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 0.05V/µs
- Gain Bandwidth Product:
- 100 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 85µA
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 32 V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LP324M/NOPB FAQ
1.How can I place an order for LP324M/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP324M/NOPB 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 LP324M/NOPB reliable?
The price and inventory of LP324M/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP324M/NOPB is usually 5 days.
3.What payment methods are accepted for LP324M/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP324M/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP324M/NOPB?
LP324M/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP324M/NOPB 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 LP324M/NOPB?
For technical support, including LP324M/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP324M/NOPB requirements.
6.How does Aetrix verify that LP324M/NOPB is sourced from the original manufacturer or authorized distributors?
All LP324M/NOPB 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 LP324M/NOPB meets industry standards.
7.What is the process for return or replacement of LP324M/NOPB?
All LP324M/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP324M/NOPB, 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 LP324M/NOPB part is unused and in its original packaging.
Return procedure for LP324M/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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