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STMicroelectronics LMX358IDT
- Part No.:
- LMX358IDT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMX358IDT.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,072
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Product details
Overview
LMX358IDT from STMicroelectronics is a dual, rail-to-rail output, low-voltage operational amplifier optimized for battery-powered and portable signal conditioning. 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) - enabling use in medical instrumentation front-ends and active filtering stages.
For engineers reviewing the LMX358IDT datasheet, LMX358IDT pinout, LMX358IDT application, or LMX358IDT equivalent, this page provides verified technical context, SO8 package pin mapping, real-world application cards, and validated alternative op-amps with documented functional differences for low-power, rail-to-rail output design scenarios.
Technical Context
The LMX358IDT integrates two independent high-precision amplifiers sharing a common supply domain, each featuring input common-mode voltage range extending to ground (VCC− − 0.2 V) and rail-to-rail output swing within 100 mV of both rails under 10 kΩ load. Its unity-gain stable architecture supports capacitive loads up to 500 pF without oscillation.
It exhibits no phase reversal or crossover distortion, achieves 75 dB typical CMRR and 79 dB SVRR at 5 V, and maintains 60° phase margin across −40 °C to +125 °C - making it suitable for precision DC-coupled sensing and low-distortion AC signal paths where supply headroom is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.3 V to 5.5 V - enables direct operation from single Li-ion or two alkaline cells without regulation. |
| Quiescent Current per Channel | 120 µA at 2.7 V - reduces battery drain in always-on sensor interfaces and portable diagnostics. |
| Gain Bandwidth Product | 1.3 MHz - supports stable unity-gain buffer configurations and low-frequency active filters up to ~100 kHz. |
| Rail-to-Rail Output Swing | Within 100 mV of VCC+ and VCC− 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 <1% error in 1 V full-scale medical transducer amplification without trimming. |
| Operating Temperature Range | −40 °C to +125 °C - qualified for under-hood automotive sensors and industrial motor control feedback loops. |
| THD+N | 0.002% at 1 kHz, 1 VPP, 10 kΩ - meets audio-grade signal integrity requirements in portable ultrasound front-ends. |
Pinout & Package
LMX358IDT is supplied in an 8-pin SOIC (SO8) package with industry-standard pinout and 1.27 mm pitch. The exposed pad is not present - thermal dissipation relies on PCB copper area connected to VCC− via standard SO8 footprint.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Channel 2) | Accepts differential signal reference or feedback node for second op-amp stage. |
| 2 | Non-inverting Input (Channel 2) | Connects to sensor output or reference voltage for differential amplification. |
| 3 | Output (Channel 2) | Drives up to 26 mA sink / 21 mA source into resistive or moderate capacitive loads. |
| 4 | VCC− | Ground reference for dual-supply operation or negative rail in single-supply systems. |
| 5 | Non-inverting Input (Channel 1) | Primary sensor interface point for first amplifier channel - includes ground in common-mode range. |
| 6 | Inverting Input (Channel 1) | Feedback or reference input for programmable gain or comparator hysteresis configuration. |
| 7 | Output (Channel 1) | Delivers rail-to-rail output with <100 mV headroom - suitable for driving SAR ADC inputs directly. |
| 8 | VCC+ | Positive supply rail - accepts 2.3–5.5 V; decoupling capacitor required within 5 mm. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Prevents latch-up and output instability when input exceeds common-mode limits - critical in overvoltage-tolerant sensor interfaces. |
| No crossover distortion | Ensures clean zero-crossing in AC-coupled audio or pulse amplification without harmonic artifacts. |
| Stable at unity gain | Eliminates need for external compensation components in buffer or follower configurations - reduces BOM count and layout area. |
| Extended temperature range | Validated operation from −40 °C to +125 °C - supports deployment in automotive cabin modules and industrial PLC I/O stages. |
| Low input bias current | Max 110 nA over temperature - minimizes voltage error in high-impedance pH or thermocouple sensor circuits. |
Applications
| Portable ECG Front-End | Smart Smoke Detector Signal Chain |
|---|---|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in handheld ECG monitors. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier core - Channel 1 as low-noise preamp, Channel 2 as right-leg drive controller. Use Value: Rail-to-rail output drives 12-bit SAR ADC directly; 120 µA/channel quiescent current extends battery life beyond 72 hours on CR2032. |
Use Scenario: Conditioning analog output from NDIR CO₂ sensor and photoelectric smoke chamber in battery-operated residential alarms. IC Role / Device Role / Timing Role: Dual op-amp performing transimpedance conversion (Channel 1) and reference voltage buffering (Channel 2). Use Value: Input common-mode range including ground allows direct connection to photodiode cathodes; 1.3 MHz GBW supports fast transient response to smoke events. |
| Industrial Temperature Transmitter | Wearable Pulse Oximeter Analog Front-End |
Use Scenario: Signal conditioning for 4–20 mA loop-powered RTD or thermistor circuits in factory automation nodes. IC Role / Device Role / Timing Role: Precision voltage follower (Channel 1) isolating sensor bridge from ADC, and differential amplifier (Channel 2) rejecting common-mode noise on long cables. Use Value: 75 dB CMRR suppresses 50/60 Hz interference; −40 °C to +125 °C rating ensures reliability in uncontrolled cabinet environments. |
Use Scenario: Amplifying and filtering red/IR photodiode currents in compact wrist-worn SpO₂ sensors. IC Role / Device Role / Timing Role: Dual transimpedance amplifier - one channel for red LED detection, one for IR LED detection, synchronized by MCU PWM. Use Value: 0.002% THD+N preserves pulse waveform fidelity; 2.3 V minimum supply enables operation during brownout conditions in coin-cell powered devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual, rail-to-rail output, low-power operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSV852IST | Lower input offset voltage (1.6 mV max), higher supply current (280 µA/ch), same SO8 package. | Better DC accuracy for precision weight scales; less suitable for ultra-low-power battery designs. | Select when offset drift and long-term stability outweigh quiescent current constraints. |
| LMV358IDR | Higher quiescent current (150 µA/ch), wider supply range (2.7–5.5 V), identical pinout and rail-to-rail output. | Marginally better noise performance (28 nV/√Hz), but lacks extended −40 °C to +125 °C qualification. | Choose for cost-sensitive consumer applications where industrial temperature range is not required. |
Compared with TSV852IST and LMV358IDR, LMX358IDT uniquely balances ultra-low power (120 µA), full industrial temperature support, and rail-to-rail output in SO8 - making it optimal for space-constrained, battery-dependent industrial and medical edge devices where longevity and environmental robustness are non-negotiable.
Availability
LMX358IDT is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor transmitters, and smart home safety systems requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LMX358IDT 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The LMX3xx series was developed specifically for low-voltage, rail-to-rail output signal conditioning in space- and power-constrained applications - emphasizing quiescent current efficiency, wide temperature operation, and compatibility with modern battery chemistries.
FAQ
Is LMX358IDT unity-gain stable?
Yes, the LMX358IDT is explicitly designed for unity-gain stability and does not require external compensation. Its internal compensation ensures ≥60° phase margin with capacitive loads up to 500 pF, enabling direct use as a voltage follower or buffer in sensor interface circuits without risk of oscillation.
What is the maximum capacitive load the LMX358IDT can drive reliably?
The LMX358IDT maintains stability with capacitive loads up to 500 pF when configured in unity gain, as confirmed by phase margin measurements across temperature. For loads exceeding 500 pF, a series resistor (≥10 Ω) between output and capacitance is recommended to preserve stability in active filter or ADC driver applications.
Does LMX358IDT support single-supply operation?
Yes - the LMX358IDT supports true single-supply operation from 2.3 V to 5.5 V. Its input common-mode range extends to VCC− (typically ground), and its rail-to-rail output swings within 100 mV of both supply rails, enabling full-swing signal processing without level-shifting circuitry.
How does LMX358IDT handle input overvoltage conditions?
The LMX358IDT features no phase reversal behavior: if input voltage exceeds the common-mode range (VCC− − 0.2 V to VCC+ − 1 V), the output remains well-behaved and predictable rather than latching or inverting. This eliminates risk of system fault propagation in sensor front-ends exposed to transient overvoltages.
LMX358IDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- 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 (x2 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:
- 8-SOIC
LMX358IDT FAQ
1.How can I place an order for LMX358IDT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX358IDT 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 LMX358IDT reliable?
The price and inventory of LMX358IDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX358IDT is usually 5 days.
3.What payment methods are accepted for LMX358IDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX358IDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX358IDT?
LMX358IDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX358IDT 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 LMX358IDT?
For technical support, including LMX358IDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX358IDT requirements.
6.How does Aetrix verify that LMX358IDT is sourced from the original manufacturer or authorized distributors?
All LMX358IDT 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 LMX358IDT meets industry standards.
7.What is the process for return or replacement of LMX358IDT?
All LMX358IDT units undergo pre-shipment inspection (PSI). If there is an issue with LMX358IDT, 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 LMX358IDT part is unused and in its original packaging.
Return procedure for LMX358IDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMX358IDT Tags
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LM358DT
STMicroelectronics
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LM358DR
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LM2904DR
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LM2904DGKR
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MCP6006UT-E/OT
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LM2902PWR
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