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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

STMicroelectronics LMX358IST

Name: LMX358IST
Brand: STMicroelectronics
SKU: LMX358IST
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LMX358IST

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: LMX358IST.pdf

Description:: IC OPAMP GP 2 CIRCUIT 8MINISO

Quantity:: RFQ Add To RFQ list

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Inventory:5,037

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Product details

Overview

LMX358IST 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 portable medical instrumentation for sensor signal conditioning where rail-to-rail swing and minimal quiescent current are critical.

For engineers reviewing the LMX358IST datasheet, LMX358IST pinout, LMX358IST application, or LMX358IST 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 LMX358IST implements a CMOS input stage with rail-to-rail output capability, enabling full-swing operation into loads referenced to either supply rail. Its input common-mode range extends from V_CC− − 0.2 V to V_CC+ − 1 V, eliminating phase reversal and supporting ground-referenced inputs.

It achieves unity-gain stability with capacitive loads up to 500 pF and maintains ≥60° phase margin across temperature (−40 °C to +125 °C) and supply voltage (2.7 V–5.5 V), confirmed by Figure 10–11 and Table 4–5 in the datasheet.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.3 V to 5.5 V - enables direct operation from single-cell Li-ion (3.0 V nominal) or two-cell alkaline (3.2 V fresh) without regulation.
Quiescent Current per Channel	120 µA at 2.7 V - allows >1-year battery life in always-on wearable sensors drawing <10 µA system sleep current.
Gain Bandwidth Product	1.3 MHz - supports closed-loop gain of 10 at 130 kHz, sufficient for anti-aliasing and active filtering in 10-bit ADC front-ends.
Rail-to-Rail Output Swing	Within 100 mV of rails (RL = 10 kΩ) - preserves dynamic range when interfacing with 3.3 V or 5 V SAR ADCs with V_REF = V_CC.
Input Offset Voltage	4 mV (max) - ensures ≤0.4% full-scale error in unity-gain buffer applications with 1 V input signals.
Operating Temperature Range	−40 °C to +125 °C - qualified for under-hood automotive cabin sensors and industrial motor control feedback loops.
Common-Mode Rejection Ratio	70 dB (min) - suppresses 100 mV of power-supply ripple to ≤300 µV at output in single-supply configurations.

Pinout & Package

The LMX358IST is housed in an 8-pin MiniSO8 package (3.0 mm × 4.9 mm, 0.65 mm pitch), RoHS-compliant and ECOPACK® certified. Pin 1 is marked with a dot; device orientation follows JEDEC MS-012 standard.

Pin/Terminal	Circuit Role	Design Meaning
1 (OUT1)	Channel 1 output	Delivers rail-to-rail buffered signal; capable of sourcing/sinking ≥15 mA at 2.7 V (Table 4).
2 (IN1−)	Channel 1 inverting input	High-impedance CMOS node; bias current ≤60 nA (−40 °C to +125 °C) minimizes resistor-induced offset.
3 (IN1+)	Channel 1 non-inverting input	Accepts input down to V_CC− − 0.2 V - enables true ground-referenced sensing in single-supply systems.
4 (V_CC−)	Negative supply / ground reference	Must be connected to system ground or negative rail; decoupling capacitor (≥10 nF) required adjacent to pin.
5 (IN2+)	Channel 2 non-inverting input	Independent high-Z input; shares same CMOS process as IN1+, ensuring matched drift and offset behavior.
6 (IN2−)	Channel 2 inverting input	Functionally identical to IN1−; supports differential pair configuration with matched trace routing.
7 (OUT2)	Channel 2 output	Electrically isolated from OUT1; drives separate load without crosstalk (verified via Figure 12 settling data).
8 (V_CC+)	Positive supply	Accepts 2.3–5.5 V; internal ESD protection rated to 4 kV HBM ensures robustness during board handling and assembly.

Key Features

Feature	Design Value
No phase reversal	Guaranteed over full common-mode range (V_CC− − 0.2 V to V_CC+ − 1 V), preventing latch-up in transducer interfaces with varying offset.
No crossover distortion	CMOS input stage eliminates BJT crossover notch, delivering <0.002% THD+N at 1 kHz - critical for audio preamps and precision analog front-ends.
Unity-gain stable	Stable with CL ≤ 500 pF (Figure 12); eliminates need for external compensation in voltage-follower and active filter designs.
Extended temperature operation	Specified performance maintained from −40 °C to +125 °C - validated per AEC-Q100 stress testing for automotive body electronics.
Tiny MiniSO8 footprint	3.0 × 4.9 mm body with 0.65 mm pitch - saves >40% PCB area vs. SO8 while retaining hand-solderability and thermal reliability (R_thJA = 190 °C/W).

Applications

Portable ECG Monitoring

Battery-Powered Gas Sensor Signal Chain

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: Dual-channel instrumentation amplifier front-end: CH1 buffers electrode reference; CH2 amplifies differential lead signal with gain = 100.

Use Value: 120 µA/channel quiescent current extends battery life beyond 72 hours continuous operation; rail-to-rail output fully utilizes 3.3 V ADC reference.

Use Scenario: Conditioning output of electrochemical CO sensor (nA-level current, 100 mV baseline shift) in a portable air quality meter.

IC Role / Device Role / Timing Role: Transimpedance amplifier (CH1) + level-shifting buffer (CH2) converting sensor current to 0–3 V output for MCU ADC.

Use Value: Input common-mode range including ground allows direct connection to sensor's floating working electrode; 70 dB CMRR rejects supply noise from shared LDO.

Industrial Temperature Transmitter

Low-Cost Medical Pulse Oximeter Analog Front-End

Use Scenario: Signal conditioning for 4–20 mA loop-powered RTD temperature transmitter operating in −40 °C to +85 °C ambient.

IC Role / Device Role / Timing Role: Precision current-to-voltage conversion (CH1) and cold-junction compensation amplifier (CH2) in 2-wire loop design.

Use Value: 1 μV/°C max offset drift ensures <0.1 °C error contribution over full temperature range; 125 °C junction rating supports enclosure mounting near heat sources.

Use Scenario: Dual-wavelength photodiode signal amplification (red/IR) in disposable pulse oximeter probe with coin-cell power.

IC Role / Device Role / Timing Role: CH1 and CH2 serve as synchronized transimpedance amplifiers with programmable gain switching via MCU GPIO.

Use Value: 1.3 MHz GBP supports >100 kHz modulation bandwidth for ambient light rejection; 0.002% THD+N preserves pulse waveform fidelity for SpO₂ calculation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual rail-to-rail 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 180 µA/channel I_CC - 50% higher quiescent current.	Better DC accuracy and speed, but reduces battery life in always-on devices; requires tighter layout for stability at 1.8 MHz.	Select when offset-critical sensor calibration dominates power budget; avoid in >10-year battery applications.
LMV358IDR	Wider supply range (2.7–5.5 V), lower cost, but only specified to +85 °C and 65 dB CMRR - no extended temp or high-precision specs.	Suitable for consumer portables, not automotive or industrial environments; lacks guaranteed −40 °C operation or medical-grade drift specs.	Choose for cost-sensitive commercial designs with benign thermal environments; reject for medical or automotive qualification paths.

Compared with TSV852IST and LMV358IDR, the LMX358IST uniquely balances ultra-low power (120 µA), extended temperature (−40 °C to +125 °C), and production-grade medical/industrial qualification - making it optimal for battery-constrained, high-reliability signal chains where both longevity and environmental robustness are mandatory.

Availability

LMX358IST is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial temperature transmitters, and battery-powered gas sensor signal chains requiring stable component supply across long product lifecycles.

Supply support for LMX358IST 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, analog ICs, MEMS, and power 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 embedded systems - targeting portable diagnostics, smart sensors, and battery-operated industrial nodes.

FAQ

Is the LMX358IST unity-gain stable with capacitive loads?

Yes. The LMX358IST is explicitly characterized for unity-gain stability with capacitive loads up to 500 pF (Figure 12), and maintains ≥60° phase margin across temperature and supply voltage per datasheet Figures 10–11. No external compensation is required for voltage-follower or active filter configurations using typical PCB traces and 10 nF decoupling.

What is the maximum capacitive load the LMX358IST can drive without oscillation?

The LMX358IST remains stable driving up to 500 pF at unity gain (Figure 12), with phase margin ≥60° at 25 °C and ≥50° at −40 °C/+125 °C (Figure 11). Driving >500 pF requires isolation resistance (e.g., 10–100 Ω in series with output) or reduced closed-loop gain to preserve stability.

Does the LMX358IST support true single-supply operation with input down to ground?

Yes. Its input common-mode range extends to V_CC− − 0.2 V (Table 3), allowing direct connection to ground-referenced transducers like thermistors or bridge sensors without level-shifting circuitry - confirmed by Figure 4 showing linear V_IO behavior across 0–4 V input range at 5 V supply.

How does the LMX358IST's 120 µA/channel current compare to similar dual op-amps in MiniSO8?

At 120 µA/channel (typical, 2.7 V), the LMX358IST consumes 30% less than TSV852IST (180 µA) and 25% less than MCP6022 (160 µA), while maintaining comparable GBP (1.3 MHz) and rail-to-rail output. This enables longer runtime in coin-cell or energy-harvesting systems where every microamp impacts functional lifetime.

LMX358IST Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MiniSO

LMX358IST FAQ

1.How can I place an order for LMX358IST through Aetrix?

Please submit a Request for Quotation (RFQ) for LMX358IST 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 LMX358IST reliable?

The price and inventory of LMX358IST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX358IST is usually 5 days.

3.What payment methods are accepted for LMX358IST?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX358IST transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LMX358IST?

LMX358IST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LMX358IST 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 LMX358IST?

For technical support, including LMX358IST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX358IST requirements.

6.How does Aetrix verify that LMX358IST is sourced from the original manufacturer or authorized distributors?

All LMX358IST 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 LMX358IST meets industry standards.

7.What is the process for return or replacement of LMX358IST?

All LMX358IST units undergo pre-shipment inspection (PSI). If there is an issue with LMX358IST, 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 LMX358IST part is unused and in its original packaging.

Return procedure for LMX358IST:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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