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STMicroelectronics LMX324IDT
- Part No.:
- LMX324IDT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMX324IDT.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,498
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Product details
Overview
LMX324IDT from STMicroelectronics is a quad, rail-to-rail output, low-voltage operational amplifier optimized for battery-powered and portable 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 operation across –40 °C to +125 °C - enabling use in medical instrumentation front-end signal conditioning and active filtering stages.
For engineers reviewing the LMX324IDT datasheet, LMX324IDT pinout, LMX324IDT application, or LMX324IDT equivalent, this page provides verified technical context, SO14 package mapping, rail-to-rail output behavior under capacitive load, input common-mode range down to VCC– – 0.2 V, and validated alternatives for low-power analog signal chains.
Technical Context
The LMX324IDT integrates four independent op-amps in a single SO14 package with unity-gain stable architecture, rail-to-rail output swing (within 180 mV of rails at 10 kΩ), and input common-mode voltage range extending to ground (VCC– – 0.2 V). Its 1.3 MHz GBP and 0.6–0.7 V/µs slew rate support medium-speed signal conditioning without phase reversal or crossover distortion.
It features no internal phase reversal, maintains CMRR ≥70 dB over temperature, achieves THD+N ≤0.002% at 1 kHz, and drives capacitive loads up to 500 pF while retaining ≥60° phase margin - confirmed across –40 °C to +125 °C at both 2.7 V and 5 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.3 V to 5.5 V - enables direct integration into single-cell Li-ion (3.0–3.7 V) and 3.3 V logic systems without level-shifting. |
| Quiescent Current (per channel) | 120 µA at 2.7 V - allows >10-year battery life in always-on sensor nodes drawing <500 µA total. |
| Gain Bandwidth Product | 1.3 MHz - supports closed-loop gains up to 13 at 100 kHz for anti-aliasing filters and transducer amplification. |
| Rail-to-Rail Output Swing | Within 100 mV of rails (typ.) at 10 kΩ load - maximizes dynamic range in low-voltage ADC driver applications. |
| Input Offset Voltage (max) | 6 mV over –40 °C to +125 °C - ensures <100 µV error in 16-bit, 3.3 V full-scale systems with gain ≤10. |
| Operating Temperature Range | –40 °C to +125 °C - qualified for under-hood automotive sensors and industrial motor control feedback paths. |
| THD+N | 0.002% at 1 kHz, 1 Vpp - meets audio-grade signal integrity requirements in portable medical ECG front-ends. |
Pinout & Package
LMX324IDT is housed in a 14-pin SOIC (SO14) package with standard industry pinout and 1.27 mm pitch. The exposed pad is not present - this is a standard plastic SO14, not thermally enhanced.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting input (Channel 1) | Accepts differential signal reference for first op-amp; common-mode range includes ground. |
| 2 | Non-inverting input (Channel 1) | High-impedance node (Iib = 27–110 nA); supports high-Z sensor interfaces. |
| 3 | Output (Channel 1) | Rail-to-rail capable; sinks/source up to 25–60 mA depending on supply and temp. |
| 4 | VCC– (GND) | Power return for all four channels; must be low-impedance with local 10 nF decoupling. |
| 5 | Non-inverting input (Channel 2) | Independent input for second op-amp; identical specs to Pin 2. |
| 6 | Inverting input (Channel 2) | Matches Pin 1 functionality; supports dual-channel instrumentation amp configurations. |
| 7 | Output (Channel 2) | Drives separate load; stable at unity gain with CL ≤ 500 pF. |
| 8 | VCC+ | Positive supply rail (2.3–5.5 V); requires dedicated 10 nF ceramic capacitor adjacent to pin. |
| 9 | Output (Channel 3) | Third independent output; shares same supply and thermal environment as other channels. |
| 10 | Inverting input (Channel 3) | Configurable as summing node or filter stage input; no phase reversal observed. |
| 11 | Non-inverting input (Channel 3) | Supports biasing to mid-supply via resistor divider for single-supply operation. |
| 12 | Non-inverting input (Channel 4) | Enables quad-channel active filtering; matched offset drift (1 µV/°C max) minimizes channel mismatch. |
| 13 | Inverting input (Channel 4) | Compatible with AC-coupled or DC-coupled topologies; input bias current stable over temperature. |
| 14 | Output (Channel 4) | Final buffered output; tested for stability driving 2 kΩ || 1000 pF loads per datasheet Figure 12. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Guaranteed over full common-mode range (VCC– – 0.2 V to VCC+ – 1 V), eliminating output latch-up during input overdrive. |
| Rail-to-rail output | Swings within 100 mV of VCC+ and VCC– at 10 kΩ load - preserves >94% of 3.3 V ADC full-scale range. |
| Unity-gain stability | Stable with CL ≤ 500 pF and RL ≥ 2 kΩ - eliminates need for external compensation in voltage-follower designs. |
| Low input bias current | 27–110 nA over temperature - enables high-impedance pH probe and piezoelectric sensor interfacing without guard traces. |
| Extended temperature operation | Specified from –40 °C to +125 °C with no derating - suitable for engine control unit (ECU) signal conditioning. |
Applications
| Portable ECG Monitor Front-End | Industrial 4–20 mA Loop Receiver |
|---|---|
|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in a handheld ECG device powered by a 3.7 V Li-ion cell. IC Role / Device Role / Timing Role: Quad configuration used for instrumentation amp (Ch1–Ch2), right-leg drive (Ch3), and ADC buffer (Ch4). Use Value: 120 µA/channel quiescent current extends battery runtime beyond 72 hours; rail-to-rail output maximizes SNR into 16-bit SAR ADC. |
Use Scenario: Converting 4–20 mA loop current to 0.5–2.5 V for MCU ADC sampling in a factory-floor pressure transmitter. IC Role / Device Role / Timing Role: First op-amp acts as precision I-to-V converter; remaining three implement filtering, level-shifting, and buffer stages. Use Value: Input common-mode range to ground allows direct connection to shunt resistor; 6 mV max Vio limits span error to <0.3% FS. |
| Automotive Cabin Temperature Sensor Signal Chain | Wearable Pulse Oximeter Analog Front-End |
|
Use Scenario: Conditioning NTC thermistor voltage in an HVAC control module operating under hood temperatures up to 125 °C. IC Role / Device Role / Timing Role: Single channel used in ratiometric bridge amplifier; others unused or configured as comparators. Use Value: Guaranteed operation at +125 °C eliminates thermal derating; 1 µV/°C max ΔVio/ΔT prevents >0.1 °C measurement drift over full range. |
Use Scenario: Amplifying and filtering photodiode current from red/IR LEDs in a wrist-worn SpO₂ sensor running on coin cell. IC Role / Device Role / Timing Role: Transimpedance amplifier (Ch1), AC-coupled gain stage (Ch2), LED current driver (Ch3), and reference buffer (Ch4). Use Value: 0.002% THD+N ensures clean PPG waveform capture; 1.3 MHz GBP supports >100 Hz pulse harmonics without attenuation. |
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 |
|---|---|---|---|
| TLV2464IDR | Higher supply current (550 µA/ch), wider VCC (2.7–6 V), lower Vio (2 mV max), but reduced temp range (–40 °C to +105 °C). | Better DC precision but unsuitable for under-hood automotive use above 105 °C. | Select when ultra-low offset dominates over power and temperature requirements. |
| MCP6004-E/SL | Lower quiescent current (1 µA/ch), narrower GBW (1 MHz), no guaranteed phase margin >400 pF, VCC = 1.8–6.0 V. | Optimized for ultra-low-power IoT sensors, not medium-speed signal conditioning. | Choose only for sub-µA standby modes where bandwidth and capacitive drive are secondary. |
Compared with TLV2464IDR and MCP6004-E/SL, LMX324IDT uniquely balances ultra-low power (120 µA), extended temperature (–40 °C to +125 °C), robust capacitive drive (≥500 pF), and rail-to-rail output - making it optimal for automotive and industrial battery-operated signal chains requiring reliability over raw precision or minimal sleep current.
Availability
LMX324IDT is available at Aetrix Electronics and suitable for portable medical devices, industrial 4–20 mA transmitters, and automotive cabin sensor modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMX324IDT 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 microcontrollers, power ICs, sensors, and analog components for industrial, automotive, and consumer markets.
The LMX3xx series was developed specifically for low-voltage, low-power, rail-to-rail signal conditioning in space-constrained portable and battery-operated equipment - emphasizing quiescent current efficiency, wide temperature resilience, and ease of layout with no external compensation.
FAQ
What is the maximum capacitive load the LMX324IDT can drive while maintaining stability?
Per Figure 12 and Table 10 in the datasheet, LMX324IDT remains stable driving up to 500 pF with a 10 kΩ resistive load in unity-gain configuration. Phase margin stays ≥60° at 25 °C and ≥40° at 125 °C under these conditions. For loads >500 pF, external isolation resistance (e.g., 10–100 Ω in series with the output) is required.
Does LMX324IDT support true single-supply operation with inputs referenced to ground?
Yes. The input common-mode voltage range extends from VCC– – 0.2 V to VCC+ – 1 V, explicitly including ground when VCC– = 0 V. This allows direct connection of transducer outputs or resistor-divider bias networks without level-shifting, confirmed across –40 °C to +125 °C.
How does the 120 µA per channel supply current scale with supply voltage?
Figure 2 shows ICC increases linearly from ~115 µA at 2.5 V to ~180 µA at 5.5 V, with typical values of 120 µA at 2.7 V and 130 µA at 5 V. Total quad-channel current remains below 720 µA at 5.5 V, preserving battery life in always-on monitoring applications.
Is the SO14 package of LMX324IDT RoHS-compliant and halogen-free?
Yes. Per Section 5 and ECOPACK® documentation in the datasheet, LMX324IDT is offered in RoHS-compliant, halogen-free SO14 packages meeting JEDEC MS-012 standards. The "IDT" order code suffix denotes industrial-grade, lead-free, and green packaging per ST's ECOPACK2 specification.
LMX324IDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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-SO
LMX324IDT FAQ
1.How can I place an order for LMX324IDT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX324IDT 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 LMX324IDT reliable?
The price and inventory of LMX324IDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX324IDT is usually 5 days.
3.What payment methods are accepted for LMX324IDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX324IDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX324IDT?
LMX324IDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX324IDT 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 LMX324IDT?
For technical support, including LMX324IDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX324IDT requirements.
6.How does Aetrix verify that LMX324IDT is sourced from the original manufacturer or authorized distributors?
All LMX324IDT 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 LMX324IDT meets industry standards.
7.What is the process for return or replacement of LMX324IDT?
All LMX324IDT units undergo pre-shipment inspection (PSI). If there is an issue with LMX324IDT, 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 LMX324IDT part is unused and in its original packaging.
Return procedure for LMX324IDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMX324IDT 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
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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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