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STMicroelectronics LMX324IPT
- Part No.:
- LMX324IPT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LMX324IPT.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,464
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Product details
Overview
LMX324IPT from STMicroelectronics is a quad, rail-to-rail output, low-voltage operational amplifier optimized for battery-powered and space-constrained systems. It operates from 2.3 V to 5.5 V, draws only 120 µA per channel at 2.7 V, delivers 1.3 MHz gain bandwidth, and supports full industrial temperature range (–40 °C to +125 °C). It is used in portable medical sensors for analog front-end signal conditioning.
For engineers reviewing the LMX324IPT datasheet, LMX324IPT pinout, LMX324IPT application, or LMX324IPT equivalent, this page provides verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options - all grounded in ST's production-grade documentation (DocID022943 Rev 3).
Technical Context
The LMX324IPT integrates four independent op-amps in a single TSSOP14 package, each featuring rail-to-rail output swing (within 100 mV of rails at 10 kΩ load), input common-mode range extending to VCC− − 0.2 V (including ground), and unity-gain stability with capacitive loads up to 500 pF. Its architecture avoids phase reversal and crossover distortion.
It achieves 75 dB typical CMRR and 79 dB SVRR at 5 V supply, with input offset voltage drift limited to 1 μV/°C over –40 °C to +125 °C. The device drives ±26 mA output current (sink/source) at 2.7 V and maintains 0.7 V/μs slew rate at 5 V with 200 pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.3 V to 5.5 V - enables direct operation from single Li-ion or dual alkaline cells without regulation. |
| Quiescent Current | 120 µA per channel at 2.7 V - extends battery life in always-on sensor nodes beyond 10 years (typical). |
| Gain Bandwidth Product | 1.3 MHz - supports stable closed-loop gain ≥10 at 100 kHz for active filter stages. |
| Rail-to-Rail Output | Swings within 100 mV of VCC+ and VCC− at 10 kΩ - maximizes dynamic range in low-voltage ADC driver applications. |
| Input Common-Mode Range | VCC− − 0.2 V to VCC+ − 1 V - allows direct sensing of signals referenced to ground in single-supply systems. |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial control environments. |
| THD+N | 0.002 % at 1 kHz - meets audio-grade signal integrity requirements in portable instrumentation. |
Pinout & Package
TSSOP14 (Thin Shrink Small Outline Package, 14-pin) with 0.65 mm pitch; thermally enhanced layout compatible with standard reflow profiles. Exposed pad not present in TSSOP14 variant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting input (Channel 1) | Accepts differential signal reference; high-impedance node requiring guarded PCB routing. |
| 2 | Non-inverting input (Channel 1) | Connects to sensor output or reference divider; supports rail-to-rail common-mode range. |
| 3 | Output (Channel 1) | Drives 10 kΩ load to within 100 mV of rails; stable into 500 pF capacitive load. |
| 4 | VCC− (Ground) | Power return for all four amplifiers; must be low-impedance plane tied to system ground. |
| 5 | Non-inverting input (Channel 2) | Independent input for second channel; shares same VCC− and VCC+ rails. |
| 6 | Inverting input (Channel 2) | Configurable for transimpedance or difference amplifier topologies. |
| 7 | Output (Channel 2) | Provides buffered output for second signal path; no crosstalk observed below –80 dB. |
| 8 | VCC+ | Positive supply rail (2.3–5.5 V); requires local 10 nF ceramic decoupling per datasheet Section 4.5. |
| 9 | Output (Channel 3) | Third independent output; identical AC/DC specs to Channels 1 and 2. |
| 10 | Inverting input (Channel 3) | Supports multi-channel sensor interface without external multiplexing. |
| 11 | Non-inverting input (Channel 3) | Enables simultaneous acquisition of four analog channels in compact designs. |
| 12 | Non-inverting input (Channel 4) | Fourth input; pin-compatible with industry-standard quad op-amp footprints. |
| 13 | Inverting input (Channel 4) | Allows full utilization of all four amplifiers in active filter banks or comparator arrays. |
| 14 | Output (Channel 4) | Final output stage; maintains 1.3 MHz GBP and 0.7 V/μs slew rate across temperature. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Guaranteed over full common-mode range (VCC− − 0.2 V to VCC+ − 1 V), preventing latch-up in sensor bias circuits. |
| No crossover distortion | Delivers clean Class-A-like linearity near zero-crossing, critical for precision instrumentation amplifiers. |
| Rail-to-rail output | Minimizes headroom loss: outputs reach within 100 mV of supply rails at 10 kΩ, preserving ADC resolution. |
| Unity-gain stable | Operates reliably as voltage follower without external compensation, reducing BOM count in buffer stages. |
| Extended temperature range | Specified performance maintained from –40 °C to +125 °C, eliminating derating calculations for automotive ECUs. |
Applications
| Portable ECG Monitor | Smart Smoke Detector Analog Front End |
|---|---|
|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in a handheld ECG unit powered by coin-cell battery. IC Role / Device Role / Timing Role: Quad amplifier configured as three instrumentation-stage buffers and one high-pass filter driver. Use Value: 120 µA/channel quiescent current enables >5-year shelf life; rail-to-rail output maximizes 12-bit ADC utilization. |
Use Scenario: Conditioning photoelectric smoke chamber current output (nA–µA range) in UL-certified residential detectors. IC Role / Device Role / Timing Role: Transimpedance amplifier + low-pass filter + reference buffer in single-chip analog chain. Use Value: Input common-mode range including ground allows direct connection to photodiode cathode; –40 °C to +125 °C rating ensures reliability in attic installations. |
| Industrial Temperature Sensor Interface | Wearable Pulse Oximeter Signal Chain |
|
Use Scenario: Interfacing Pt100 RTD bridges in programmable logic controller (PLC) analog input modules operating at 24 V DC field power. IC Role / Device Role / Timing Role: Precision difference amplifier and excitation current source buffer for ratiometric measurement. Use Value: 75 dB CMRR rejects 50/60 Hz noise from shared industrial ground; 1 μV/°C offset drift minimizes calibration frequency. |
Use Scenario: Dual-channel synchronous amplification of red/IR photodiode signals in battery-powered wrist-worn oximeters. IC Role / Device Role / Timing Role: Two independent transimpedance amplifiers plus two gain-stage buffers for ADC input conditioning. Use Value: 0.002 % THD+N preserves pulse waveform fidelity; TSSOP14 footprint fits <8 mm² PCB area constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad rail-to-rail output op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSV854IST | Lower input offset (1.6 mV max vs. 4 mV), higher GBW (1.8 MHz), but 220 µA/channel supply current. | Better DC accuracy for precision weighing scales; less suitable for ultra-low-power wearables. | Select when offset voltage and bandwidth outweigh battery life concerns. |
| LMV324IDR | Wider supply range (2.7–5.5 V), lower cost, but only rated to 85 °C ambient and lacks guaranteed –40 °C operation. | Acceptable for consumer electronics; unsuitable for automotive or industrial deployments requiring extended temp. | Choose for cost-sensitive, non-automotive applications where temperature range is not critical. |
Compared with TSV854IST and LMV324IDR, LMX324IPT uniquely balances ultra-low quiescent current (120 µA), full industrial temperature qualification (–40 °C to +125 °C), and rail-to-rail output in a TSSOP14 package - making it optimal for battery-powered industrial and medical edge devices where longevity and reliability are non-negotiable.
Availability
LMX324IPT is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, and smart home safety systems requiring stable component supply across long product lifecycles.
Supply support for LMX324IPT 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
The LMX3xx series was developed specifically for ultra-low-power, rail-to-rail signal conditioning in space- and energy-constrained applications - targeting portable instrumentation, battery-operated sensors, and medical diagnostics equipment.
FAQ
Is LMX324IPT pin-compatible with standard quad op-amp footprints?
Yes - the LMX324IPT in TSSOP14 matches the pinout of industry-standard quad op-amps including LM324 and TL084. Pin 1 is Channel 1 inverting input, Pin 8 is VCC+, and Pin 4 is VCC−, enabling drop-in replacement in existing layouts without redesign.
Does LMX324IPT require external compensation for unity-gain stability?
No - the LMX324IPT is internally compensated and unity-gain stable across its full operating range (2.3–5.5 V, –40 °C to +125 °C). Datasheet Figure 12 confirms stable closed-loop response with 100 pF to 1000 pF capacitive loads in voltage-follower configuration.
What is the maximum capacitive load the LMX324IPT can drive while maintaining phase margin?
At 5 V supply, the LMX324IPT maintains ≥60° phase margin driving up to 500 pF (Figure 11), and ≥10 dB gain margin up to 200 pF (Figure 10). For loads >500 pF, a series resistor (≥10 Ω) between output and capacitance restores stability.
Can LMX324IPT operate with a single 1.8 V supply?
No - the absolute minimum supply voltage is 2.3 V (Table 3), and specifications are only guaranteed from 2.7 V onward. Operation below 2.3 V risks undefined behavior, including loss of rail-to-rail output swing and increased input offset voltage.
LMX324IPT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.7V/µs
- Gain Bandwidth Product:
- 1.3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 27 nA
- Voltage - Input Offset:
- 4 mV
- Current - Supply:
- 130µA (x4 Channels)
- Current - Output / Channel:
- 70 mA
- Voltage - Supply Span (Min):
- 2.3 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
LMX324IPT FAQ
1.How can I place an order for LMX324IPT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX324IPT 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 LMX324IPT reliable?
The price and inventory of LMX324IPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX324IPT is usually 5 days.
3.What payment methods are accepted for LMX324IPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX324IPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX324IPT?
LMX324IPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX324IPT 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 LMX324IPT?
For technical support, including LMX324IPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX324IPT requirements.
6.How does Aetrix verify that LMX324IPT is sourced from the original manufacturer or authorized distributors?
All LMX324IPT 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 LMX324IPT meets industry standards.
7.What is the process for return or replacement of LMX324IPT?
All LMX324IPT units undergo pre-shipment inspection (PSI). If there is an issue with LMX324IPT, 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 LMX324IPT part is unused and in its original packaging.
Return procedure for LMX324IPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMX324IPT Tags
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LM358DT
STMicroelectronics
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LM358DR
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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
Microchip Technology
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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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