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Texas Instruments LP324MX
- Part No.:
- LP324MX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP324MX.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,597
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Product details
Overview
LP324MX from Texas Instruments is a micropower quad operational amplifier optimized for battery-powered and single-supply systems. It delivers 85 μA typical supply current, 2 mV typical input offset voltage, and rail-to-ground input common-mode range - enabling precision signal conditioning in portable instrumentation and low-power sensor interfaces.
For engineers reviewing the LP324MX datasheet, LP324MX pinout, LP324MX application, or LP324MX equivalent, key selection criteria include its 0°C to +70°C operating temperature range, SOIC-14 package, pin-for-pin compatibility with LM324, and verified performance in single-supply comparator and buffer circuits.
Technical Context
The LP324MX integrates four independent, internally compensated op-amps with class-B output stages capable of sourcing and sinking current. Its input stage supports common-mode voltages down to ground and interfaces directly with CMOS logic without level-shifting.
It operates across a wide 3 V to 32 V supply range, features 100 kHz gain-bandwidth product and 50 V/ms slew rate, and maintains stability driving capacitive loads from 50 pF to 1000 pF - making it suitable for DC-coupled sensing and low-frequency active filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 32 V - supports single-supply operation from coin-cell to industrial rails |
| Supply Current (per amp) | 85 μA typ - enables multi-year battery life in always-on monitoring nodes |
| Input Offset Voltage | 2 mV typ - ensures <±5 mV error in 12-bit ADC front-ends at room temperature |
| Input Bias Current | 2 nA typ - minimizes voltage drop across high-impedance sensor bridges & pH electrodes |
| Input Common-Mode Range | 0 V to V+−1.5 V - allows direct connection to grounded sensors and single-supply references |
| Output Swing (RL = ∞) | 0.7 V to V+−1.9 V - delivers usable dynamic range near both rails in 3.3 V or 5 V systems |
| Gain-Bandwidth Product | 100 kHz - sufficient for anti-aliasing filters, DC amplification, and slow-settling comparators |
Pinout & Package
LP324MX is housed in a 14-pin SOIC (D) package per JEDEC MS-012 AB, 8.75 mm × 4.0 mm footprint, 1.75 mm max height, with standard 1.27 mm lead pitch and SN lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Amplifier A Output | Class-B buffered output; sinks up to 5 mA, sources up to 10 mA into 350 μA load |
| 2 | Amplifier A Inverting Input | Differential input node; accepts signals down to GND; bias current 2 nA typ |
| 3 | Amplifier A Non-Inverting Input | Differential input node; same bias and common-mode specs as Pin 2 |
| 4 | V− (GND) | Ground reference for all amplifiers; input common-mode extends to this pin |
| 5 | Amplifier B Non-Inverting Input | Independent input for second op-amp; identical specs to Pins 2 and 3 |
| 6 | Amplifier B Inverting Input | Adjacent to Pin 7 (B output) for compact feedback layout |
| 7 | Amplifier B Output | Second independent output; pinout symmetry simplifies PCB routing |
| 8 | V+ | Positive supply rail; supports up to 32 V; internal ESD protection ±500 V HBM |
| 9 | Amplifier C Non-Inverting Input | Third op-amp input; matches full family AC/DC specs |
| 10 | Amplifier C Inverting Input | Paired with Pin 11 (C output); enables compact inverting gain stages |
| 11 | Amplifier C Output | Third output; layout-optimized placement at package corner |
| 12 | Amplifier D Inverting Input | Fourth op-amp inverting input; adjacent to Pin 13 (D non-inv) |
| 13 | Amplifier D Non-Inverting Input | Final input pair; supports differential sensing or reference buffering |
| 14 | Amplifier D Output | Fourth output; positioned at opposite corner for balanced trace lengths |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 85 μA per amplifier enables >10-year battery life in 200 μA system sleep modes |
| Rail-to-ground input | Common-mode range includes 0 V - eliminates need for input biasing in single-supply sensor amps |
| CMOS logic interface | Output swing compatible with 3.3 V and 5 V logic thresholds without external pull-ups |
| Capacitive load drive | Stable with 50–1000 pF loads - supports direct connection to ADC sample capacitors and long traces |
| Pin-for-pin LM324 replacement | SOIC-14 footprint and functionally identical pin mapping - no PCB redesign required |
Applications
| Portable Gas Sensor Signal Conditioning | Battery Backup Voltage Monitor |
|---|---|
Use Scenario: Amplifying low-level mV outputs from electrochemical gas cells while operating on CR2032 coin cell. IC Role / Device Role / Timing Role: Quad op-amp configured as transimpedance amplifier, reference buffer, comparator with hysteresis, and output driver. Use Value: 85 μA quiescent current extends sensor node lifetime beyond 5 years; rail-to-ground inputs accept zero-referenced sensor outputs directly. |
Use Scenario: Monitoring main supply voltage during brownout and triggering backup power switchover in medical data loggers. IC Role / Device Role / Timing Role: Precision comparator with adjustable threshold using one amplifier section; remaining sections condition backup battery voltage and enable status signals. Use Value: 2 mV offset ensures accurate 3.3 V detection within ±10 mV; wide 3–32 V supply range accommodates both Li-ion and alkaline backup sources. |
| Low-Power Industrial Thermistor Interface | Single-Supply Active Lowpass Filter |
Use Scenario: Linearizing and amplifying resistance changes from NTC thermistors in HVAC control panels powered by 24 V DC rails. IC Role / Device Role / Timing Role: Instrumentation-grade amplifier (dual-op-amp difference configuration), excitation current source, and reference buffer. Use Value: 2 nA input bias current prevents self-heating errors in high-resistance thermistor strings; 32 V max supply supports unregulated industrial inputs. |
Use Scenario: Filtering 50/60 Hz noise from analog sensor outputs before digitization in smart metering modules. IC Role / Device Role / Timing Role: Quad op-amp implementing 2-pole Sallen-Key topology with unity-gain buffer isolation. Use Value: 100 kHz GBW ensures stable filter response up to 10 kHz; SOIC-14 package allows compact 2-layer PCB layout with minimal parasitic coupling. |
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 rail-to-ground input | Acceptable where power budget >100 μA/amp and offset <10 mV suffices; not suitable for true 0 V referenced sensors | Select LM324DR only when legacy design reuse or cost sensitivity outweighs micropower and precision requirements |
| TLV2464IDR | Lower 23 μA supply current; rail-to-rail I/O; 1.5 MHz GBW; 3 V min supply | Preferred for higher-speed filtering or rail-to-rail output swing needs; requires ≥3 V supply | Choose TLV2464IDR when system demands sub-100 μA total quiescent current and full output swing to both rails |
Compared with LM324DR, LP324MX reduces supply current by 94% and guarantees ground-sensing inputs; versus TLV2464IDR, it trades bandwidth and rail-to-rail output for broader supply range (down to 3 V) and proven robustness in noisy industrial environments.
Availability
LP324MX is available at Aetrix Electronics and suitable for portable instrumentation, battery backup equipment, and single-supply sensor interfaces requiring stable component supply across extended production lifecycles.
Supply support for LP324MX 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, longevity, and broad application support.
The LP324MX belongs to TI's micropower op-amp product line, engineered specifically for energy-constrained systems where ultra-low quiescent current, ground-sensing capability, and LM324 compatibility are critical design requirements.
FAQ
What is the operating temperature range for the LP324MX?
The LP324MX is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with its target use in consumer-grade portable instruments and industrial control peripherals where extreme temperature resilience is not required. The LP324MX datasheet confirms this range under Operating Conditions, distinguishing it from the −40°C to +85°C range of the LP2902-N variant.
Is the LP324MX pin-compatible with the LM324?
Yes, the LP324MX is explicitly designed as a pin-for-pin replacement for the LM324 in SOIC-14 packages. Its pinout matches exactly - including shared V+ (Pin 8), GND (Pin 4), and identical amplifier input/output assignments - allowing drop-in substitution without PCB modification. This compatibility is confirmed in TI's APPLICATION HINTS section and Electrical Characteristics table footnotes.
Does the LP324MX support single-supply operation with input signals at ground potential?
Yes, the LP324MX features an input common-mode voltage range that includes ground (0 V), enabling direct connection of sensors or signal sources referenced to system GND. This is validated in the Electrical Characteristics table (VCM specification) and emphasized in the DESCRIPTION section as a key differentiator from standard op-amps like the LM324, which require input biasing above GND.
What is the maximum supply voltage rating for the LP324MX?
The LP324MX has an absolute maximum supply voltage rating of 32 V (or ±16 V in dual-supply mode). This allows safe operation across a wide range of industrial and automotive auxiliary rails. The datasheet specifies this in Absolute Maximum Ratings and confirms functional operation up to 32 V in Operating Conditions and Electrical Characteristics test conditions.
Can the LP324MX drive capacitive loads without oscillation?
Yes, the LP324MX is characterized for stable operation with capacitive loads from 50 pF to 1000 pF, as stated in APPLICATION HINTS. This makes it suitable for driving ADC input capacitors, long cables, or RC-filtered outputs without external compensation. Stability is achieved via internal compensation optimized for micropower operation, unlike faster op-amps requiring series resistors.
LP324MX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
LP324MX FAQ
1.How can I place an order for LP324MX through Aetrix?
Please submit a Request for Quotation (RFQ) for LP324MX 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 LP324MX reliable?
The price and inventory of LP324MX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP324MX is usually 5 days.
3.What payment methods are accepted for LP324MX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP324MX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP324MX?
LP324MX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP324MX 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 LP324MX?
For technical support, including LP324MX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP324MX requirements.
6.How does Aetrix verify that LP324MX is sourced from the original manufacturer or authorized distributors?
All LP324MX 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 LP324MX meets industry standards.
7.What is the process for return or replacement of LP324MX?
All LP324MX units undergo pre-shipment inspection (PSI). If there is an issue with LP324MX, 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 LP324MX part is unused and in its original packaging.
Return procedure for LP324MX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP324MX Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
-
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
-
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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