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STMicroelectronics LMX358IQ2T
- Part No.:
- LMX358IQ2T
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
LMX358IQ2T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:35,592
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Product details
Overview
LMX358IQ2T from STMicroelectronics is a dual, rail-to-rail output operational amplifier optimized for low-voltage, low-power applications. 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 extended temperature range (–40 °C to +125 °C). It is used in battery-powered medical instrumentation and portable signal conditioning circuits.
For engineers reviewing the LMX358IQ2T datasheet, LMX358IQ2T pinout, LMX358IQ2T application, or LMX358IQ2T equivalent, key selection criteria include rail-to-rail output swing under light load, input common-mode range extending to ground, low quiescent current across voltage and temperature, and stability with capacitive loads up to 500 pF.
Technical Context
The LMX358IQ2T integrates two independent op-amp channels in a single DFN8 2×2 mm package, each featuring an input stage that accepts common-mode voltages down to VCC− − 0.2 V and outputs capable of swinging within 100 mV of both rails into 10 kΩ. Its unity-gain stable architecture supports closed-loop configurations without external compensation.
It exhibits no phase reversal over its full input common-mode range and maintains ≥60° phase margin with 200 pF capacitive load at 5 V supply. Input offset voltage is specified at ≤6 mV over –40 °C to +125 °C, and input bias current remains below 110 nA across temperature.
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. |
| Quiescent Current per Channel | 120 µA at 2.7 V - allows >1-year battery life in always-on sensor front-ends. |
| Gain Bandwidth Product | 1.3 MHz - supports audio-band filtering and moderate-speed signal acquisition. |
| Rail-to-Rail Output Swing | Within 100 mV of VCC+ and VCC− at 10 kΩ load - maximizes dynamic range in low-voltage systems. |
| Input Common-Mode Range | VCC− − 0.2 V to VCC+ − 1 V - permits ground-referenced inputs and single-supply transducer interfacing. |
| Operating Temperature Range | –40 °C to +125 °C - qualified for automotive cabin and industrial control environments. |
| Input Offset Voltage (max) | 6 mV over full temperature range - ensures <0.5% error in 1 V full-scale DC-coupled amplification. |
Pinout & Package
LMX358IQ2T is housed in a thermally enhanced, lead-free DFN8 2×2 mm package (0.5 mm pitch) with exposed thermal pad. The package supports high-density PCB layouts and offers RthJA = 57 °C/W for efficient power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN1+) | Non-inverting input, Channel 1 | Accepts signals down to VCC− − 0.2 V; no phase reversal on overdrive. |
| 2 (IN1−) | Inverting input, Channel 1 | Differential pair input node; bias current ≤110 nA over temperature. |
| 3 (OUT1) | Output, Channel 1 | Rail-to-rail swing (≤100 mV from rails into 10 kΩ); drives ≥26 mA sink/source. |
| 4 (VCC−) | Negative supply / ground reference | Common return for both channels; supports single-supply operation with VCC− = 0 V. |
| 5 (IN2+) | Non-inverting input, Channel 2 | Independent of Channel 1; identical input specs and ESD robustness (4 kV HBM). |
| 6 (IN2−) | Inverting input, Channel 2 | Matches Channel 1 performance; CMRR ≥68 dB over full temperature range. |
| 7 (OUT2) | Output, Channel 2 | Unity-gain stable; slew rate = 0.6–0.7 V/µs depending on supply voltage. |
| 8 (VCC+) | Positive supply | Accepts 2.3–5.5 V; internal protection limits absolute max to 6 V. |
Key Features
| Feature | Design Value |
|---|---|
| No crossover distortion | Enables clean AC signal amplification near zero-crossing in single-supply audio paths. |
| No phase reversal | Prevents latch-up or instability when input exceeds common-mode range - critical for sensor fault tolerance. |
| Stable at unity gain | Eliminates need for external compensation components in voltage-follower or gain=1 buffer designs. |
| Drives capacitive loads up to 500 pF | Supports direct connection to ADC input filters or long PCB traces without oscillation. |
| Extended temperature qualification | Guaranteed parametric performance from –40 °C to +125 °C - suitable for under-hood or industrial enclosures. |
Applications
| Portable ECG Front-End | Battery-Powered pH Sensor Interface |
|---|---|
Use Scenario: Amplifies microvolt-level biopotential signals from dry electrodes in handheld ECG monitors. IC Role / Device Role / Timing Role: Dual-channel DC-coupled instrumentation amplifier stage (gain = 100), with one channel for signal path and second for reference buffering. Use Value: Rail-to-rail output preserves full 1.8 V ADC input range; 120 µA/channel extends coin-cell life beyond 18 months. |
Use Scenario: Conditions analog output from ISFET-based pH probes in field-deployable water quality meters. IC Role / Device Role / Timing Role: Transimpedance amplifier + level-shifting buffer, converting nanoamp current to ratiometric voltage referenced to mid-supply. Use Value: Input common-mode range including ground enables direct connection to probe's floating reference; low VIO drift minimizes calibration drift over temperature. |
| Low-Power Active Filter for IoT Node | Medical Pulse Oximeter Analog Front-End |
Use Scenario: Implements 2nd-order Sallen-Key low-pass filter (cutoff = 10 Hz) in wearable motion artifact rejection. IC Role / Device Role / Timing Role: Dual op-amp configured as unity-gain buffer and filter integrator; operates from 3.3 V coin cell. Use Value: Unity-gain stability eliminates compensation network; 1.3 MHz GBP ensures accurate filter response shape without peaking. |
Use Scenario: Amplifies red/IR photodiode currents in compact pulse oximeters with optical isolation constraints. IC Role / Device Role / Timing Role: Transimpedance amplifier (Channel 1) and ambient-light cancellation subtractor (Channel 2). Use Value: Matched dual-channel characteristics reduce common-mode errors; 4 kV HBM ESD rating protects against handling damage during assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual rail-to-rail output op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSV852IST | Lower input offset (1.6 mV typ), higher GBP (1.8 MHz), but higher IQ (320 µA/ch) and narrower VCC range (2.7–5.5 V). | Better DC precision and speed, but unsuitable for sub-2.7 V battery operation or ultra-low-power designs. | Select when accuracy and bandwidth outweigh battery life requirements. |
| LMV358IDR | Wider VCC range (2.7–6 V), lower cost, but higher VIO (7 mV max), no guaranteed 125 °C operation, and no DFN8 option. | Acceptable for commercial-grade portable devices, but not qualified for automotive or extended-temperature industrial use. | Select for cost-sensitive, non-extended-temp applications where SO8 packaging is preferred. |
Compared with TSV852IST and LMV358IDR, LMX358IQ2T uniquely balances ultra-low quiescent current, full industrial temperature range, rail-to-rail output, and space-constrained DFN8 packaging - making it optimal for battery-powered medical and sensing nodes requiring long service life and small form factor.
Availability
LMX358IQ2T is available at Aetrix Electronics and suitable for battery-powered medical instrumentation, portable environmental sensors, and low-power active filtering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMX358IQ2T 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 general-purpose, low-voltage, rail-to-rail op-amp applications in space- and power-constrained portable and medical electronics - emphasizing robustness, ease of use, and extended temperature reliability.
FAQ
What is the maximum capacitive load the LMX358IQ2T can drive while remaining stable?
The LMX358IQ2T is unity-gain stable and maintains ≥60° phase margin with up to 500 pF capacitive load at 5 V supply, as verified in Figure 12 and Table 10 of the datasheet. For loads >200 pF, layout best practices (short traces, local decoupling) are recommended to preserve stability margins.
Does the LMX358IQ2T support true single-supply operation with input signals at ground potential?
Yes. Its input common-mode range extends to VCC− − 0.2 V, allowing direct connection of ground-referenced transducers or sensors when VCC− = 0 V. No level-shifting circuitry is required for DC-coupled inputs at 0 V.
Is the exposed thermal pad on the DFN8 package electrically connected or optional?
The exposed pad on the LMX358IQ2T's DFN8 package is internally connected to VCC− (pin 4) and must be soldered to a PCB thermal pad tied to the system ground plane to achieve rated RthJA = 57 °C/W and ensure reliable thermal performance.
How does the LMX358IQ2T's input offset voltage drift compare to competing dual op-amps in the same class?
LMX358IQ2T specifies ΔVIO/ΔT ≤ 1 µV/°C over –40 °C to +125 °C (Table 4, footnote 1), which is among the lowest in its ultra-low-power dual op-amp category - significantly better than LMV358 (typically 2.5 µV/°C) and comparable to higher-cost precision variants.
LMX358IQ2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- 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-DFN (2x2)
LMX358IQ2T FAQ
1.How can I place an order for LMX358IQ2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX358IQ2T 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 LMX358IQ2T reliable?
The price and inventory of LMX358IQ2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX358IQ2T is usually 5 days.
3.What payment methods are accepted for LMX358IQ2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX358IQ2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX358IQ2T?
LMX358IQ2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX358IQ2T 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 LMX358IQ2T?
For technical support, including LMX358IQ2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX358IQ2T requirements.
6.How does Aetrix verify that LMX358IQ2T is sourced from the original manufacturer or authorized distributors?
All LMX358IQ2T 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 LMX358IQ2T meets industry standards.
7.What is the process for return or replacement of LMX358IQ2T?
All LMX358IQ2T units undergo pre-shipment inspection (PSI). If there is an issue with LMX358IQ2T, 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 LMX358IQ2T part is unused and in its original packaging.
Return procedure for LMX358IQ2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMX358IQ2T Tags
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LM358DT
STMicroelectronics
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LM358DR
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MCP6006UT-E/OT
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