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Texas Instruments LP324MTX
- Part No.:
- LP324MTX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LP324MTX.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,527
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Product details
Overview
LP324MTX from Texas Instruments is a micropower quad operational amplifier in 14-pin TSSOP (PW) package, 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-ideal for battery-powered instrumentation and portable sensor signal conditioning.
For engineers reviewing the LP324MTX datasheet, LP324MTX pinout, LP324MTX application, or LP324MTX equivalent, key selection criteria include micropower operation under 100 μA, ground-sensing input capability, guaranteed performance across 0°C to +70°C, and compatibility with standard 14-pin op-amp layouts requiring minimal PCB redesign.
Technical Context
The LP324MTX implements four independent, internally compensated high-gain op-amps optimized for ultra-low quiescent current. Its input stage supports common-mode voltages down to GND, enabling true single-supply operation without level-shifting circuitry.
Each amplifier features class-B output stage capable of sourcing up to 10 mA and sinking up to 5 mA, with output swing within 1.9 V of V+ and 0.7 V above GND at 350 μA load-enabling direct interfacing with low-voltage logic and analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 32 V single supply - supports wide-input industrial and automotive auxiliary rails |
| Quiescent Current per Amp | 85 μA typ - enables multi-year battery life in always-on sensor nodes |
| Input Offset Voltage | 2 mV typ - ensures <1% error in 100 mV full-scale DC-coupled measurements |
| Input Bias Current | 2 nA typ - minimizes voltage drop across high-impedance source networks (e.g., pH electrodes) |
| Common-Mode Input Range | Includes GND - eliminates need for biasing resistors in single-supply transducer interfaces |
| Gain Bandwidth Product | 100 kHz - suitable for DC–10 kHz signal conditioning (e.g., thermocouple amplification) |
| Slew Rate | 50 V/ms - adequate for step-response settling in slow-control loops and data acquisition front-ends |
Pinout & Package
TSSOP-14 (PW) package, 5.0 mm × 4.4 mm × 1.2 mm height, moisture sensitivity level 1, lead finish Sn, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output A | Amplifier A output - drives low-impedance loads up to 10 mA source / 5 mA sink |
| 2 | Inverting Input A | High-impedance node (2 nA bias) - placed adjacent to Pin 1 for compact feedback layout |
| 3 | Non-Inverting Input A | DC-coupled to GND - enables zero-input reference configurations |
| 4 | V− (GND) | Ground reference for all amplifiers - shared return path for quiescent current and output loads |
| 5 | Non-Inverting Input B | Independent input - supports dual-channel sensor buffering without crosstalk |
| 6 | Inverting Input B | Adjacent to Pin 7 - facilitates compact inverting gain-stage routing |
| 7 | Output B | Amplifier B output - corner-pin placement simplifies PCB trace escape |
| 8 | Output C | Amplifier C output - matches Pin 7 layout symmetry for balanced board routing |
| 9 | Inverting Input C | Paired with Pin 8 - maintains consistent feedback loop geometry across channels |
| 10 | Non-Inverting Input C | GND-referenced input - used in unity-gain buffer or level-shifted reference circuits |
| 11 | Non-Inverting Input D | Fourth channel input - supports multi-sensor systems (e.g., 4-wire RTD + cold-junction compensation) |
| 12 | Inverting Input D | Paired with Pin 13 - enables matched differential gain stages |
| 13 | Output D | Amplifier D output - corner-pin placement (like Pins 1, 7, 8) eases fanout to multiple destinations |
| 14 | V+ | Positive supply rail - accepts up to 32 V; decoupling capacitor required within 1 cm |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 85 μA per amplifier enables >5-year runtime on CR2032 in wake-on-event sensor nodes |
| Rail-to-ground input | Input common-mode extends to GND - eliminates external bias networks in single-supply transducer amps |
| CMOS logic interface | Output swing reaches within 0.7 V of GND and 1.9 V below V+ - directly drives 3.3 V and 5 V logic thresholds |
| Pin-for-pin LM324 replacement | Same 14-pin TSSOP footprint as industry-standard quad op-amp - no PCB rework required for upgrade |
| Capacitive load stability | Stable with 50–1000 pF loads - supports direct connection to ADC input capacitors without isolation resistors |
Applications
| Portable Instrumentation | Battery Backup Systems |
|---|---|
Use Scenario: Handheld multimeter front-end amplifying µV-level thermocouple outputs and mV-level strain gauge bridges. IC Role / Device Role / Timing Role: Quad amplifier provides simultaneous signal conditioning for voltage, current, temperature, and resistance measurement channels. Use Value: 2 mV offset and 2 nA bias current preserve accuracy across 4½-digit resolution while 85 μA quiescent current extends battery life beyond 100 hours. | Use Scenario: UPS monitoring circuit measuring battery voltage, charge current, temperature, and backup load status. IC Role / Device Role / Timing Role: LP324MTX buffers sensor signals and drives comparator inputs for state-of-charge and fault detection logic. Use Value: Rail-to-ground input allows direct sensing of 0–2.5 V battery cell voltages without level-shifting; 32 V max supply accommodates 24 V system rails. |
| Industrial Sensor Interfaces | Low-Power Data Acquisition |
Use Scenario: 4–20 mA loop-powered transmitter conditioning RTD, thermistor, and pressure sensor outputs. IC Role / Device Role / Timing Role: Amplifier stages provide excitation current control, ratiometric scaling, and output buffering before DAC or current sink. Use Value: 85 μA per amp contributes <340 μA total quiescent load - fits within 3.5 mA loop budget while maintaining 0.1% linearity. | Use Scenario: Wireless environmental node sampling temperature, humidity, and CO₂ with 16-bit SAR ADC. IC Role / Device Role / Timing Role: LP324MTX acts as anti-alias filter driver, reference buffer, and sensor excitation amplifier in sleep/wake cycle. Use Value: Stable 100 kHz GBW ensures <0.1% gain error at 10 kHz anti-alias cutoff; TSSOP-14 footprint saves space vs. SOIC alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM324DT | Higher 1.5 mA supply current per amp; 7 mV max offset; no rail-to-GND input | Requires input biasing for single-supply use; unsuitable for multi-year battery operation | Select when legacy compatibility and higher drive strength outweigh micropower needs |
| TLV2464IDR | Lower 22 μA supply current; rail-to-rail I/O; 1.5 mV offset; 2.5 V min supply | Cannot operate below 2.5 V - incompatible with 1.8 V or 2.0 V microcontrollers | Prefer for ultra-low-power designs with ≥2.5 V supplies and rail-to-rail output requirements |
Compared with LM324DT and TLV2464IDR, LP324MTX uniquely balances sub-100 μA quiescent current, ground-sensing input, and 3 V minimum supply - making it optimal for cost-sensitive, long-life, single-supply industrial sensors where rail-to-rail output is unnecessary.
Availability
LP324MTX is available at Aetrix Electronics and suitable for portable instrumentation, battery backup systems, and industrial sensor interfaces requiring stable component supply across extended production lifecycles.
Supply support for LP324MTX 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LP324MTX belongs to TI's micropower operational amplifier product line, engineered specifically for battery-constrained applications demanding precision DC performance with ultra-low supply current.
FAQ
What is the operating temperature range for the LP324MTX?
The LP324MTX is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with its target applications in portable instrumentation and industrial control panels where internal board temperatures remain within this envelope. The device's thermal resistance (θJA = 154°C/W for TSSOP) supports reliable operation at full 32 V supply under natural convection cooling.
Does the LP324MTX support single-supply operation with input signals at ground potential?
Yes, the LP324MTX supports true single-supply operation with input common-mode voltage extending to GND. Its input stage is designed to accept signals from 0 V up to V+ − 1.5 V, eliminating the need for external biasing resistors or level-shifting circuitry when interfacing with grounded sensors such as thermocouples or bridge transducers. This feature is explicitly confirmed in the Electrical Characteristics table and APPLICATION HINTS section of the LP324-N datasheet.
Is the LP324MTX pin-compatible with the LM324?
Yes, the LP324MTX is pin-for-pin compatible with the LM324 in the same TSSOP-14 (PW) package. The datasheet states "pin-for-pin equivalent to the LM324 op amps" and confirms identical pin functions across all 14 terminals. This allows direct replacement in existing designs without PCB modification, though users must verify that the reduced slew rate (50 V/ms vs. LM324's ~0.5 V/ms) and lower GBW (100 kHz vs. ~1 MHz) meet system AC performance requirements.
What is the maximum supply voltage rating for the LP324MTX?
The LP324MTX has an absolute maximum supply voltage rating of 32 V (or ±16 V for dual-supply use). This rating is validated across the full operating temperature range and supports applications powered from 24 V industrial rails or multi-cell battery stacks. Operation above 15 V requires attention to power dissipation limits, especially under output short-circuit conditions, as detailed in the Absolute Maximum Ratings and APPLICATION HINTS sections.
Can the LP324MTX drive capacitive loads without oscillation?
Yes, the LP324MTX is designed for improved stability with capacitive loads ranging from 50 pF to 1000 pF. The datasheet explicitly states "improved stability margin for driving capacitive loads" and confirms "no special precautions are needed" within this range - making it suitable for direct connection to ADC input capacitors, long cables, or RC filters without added isolation resistors. This behavior is verified in Typical Performance Curves including Figure 13 (Output Characteristics) and Figure 14 (Current Sinking).
LP324MTX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm 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-TSSOP
LP324MTX FAQ
1.How can I place an order for LP324MTX through Aetrix?
Please submit a Request for Quotation (RFQ) for LP324MTX 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 LP324MTX reliable?
The price and inventory of LP324MTX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP324MTX is usually 5 days.
3.What payment methods are accepted for LP324MTX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP324MTX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP324MTX?
LP324MTX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP324MTX 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 LP324MTX?
For technical support, including LP324MTX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP324MTX requirements.
6.How does Aetrix verify that LP324MTX is sourced from the original manufacturer or authorized distributors?
All LP324MTX 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 LP324MTX meets industry standards.
7.What is the process for return or replacement of LP324MTX?
All LP324MTX units undergo pre-shipment inspection (PSI). If there is an issue with LP324MTX, 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 LP324MTX part is unused and in its original packaging.
Return procedure for LP324MTX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP324MTX Tags
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