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Analog Devices Inc./Maxim Integrated LMX358AUA
- Part No.:
- LMX358AUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMX358AUA.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,688
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Product details
Overview
LMX358AUA from Maxim Integrated is a dual, general-purpose, rail-to-rail output operational amplifier optimized for low-voltage, battery-powered systems. It operates from a single +2.3V to +7V supply, draws 210µA quiescent current (typical at +2.7V), delivers 1.3MHz gain-bandwidth product, and swings within 40mV of both rails into 2kΩ loads - enabling precision signal conditioning in portable medical sensors and handheld instrumentation.
For engineers reviewing the LMX358AUA datasheet, LMX358AUA pinout, LMX358AUA application, or LMX358AUA equivalent, this page provides verified electrical parameters, µMAX-8 package layout guidance, dual-amplifier channel isolation behavior, and validated alternatives for low-power analog front-end design.
Technical Context
The LMX358AUA integrates two independent bipolar op amp cores sharing a common VCC and VEE supply domain. Each amplifier features input common-mode range extending 0.2V below ground and up to 0.8V below VCC, enabling true single-supply operation with inputs referenced to system ground.
Its unity-gain stable architecture supports capacitive loads up to 400pF without external compensation, and its rail-to-rail output stage maintains linearity while sourcing/sinking ≥10mA into 2kΩ loads across -40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.3V to +7V single supply - enables direct integration with Li-ion, 3.3V, and 5V logic rails without level-shifting. |
| Quiescent Current per Amplifier | 210µA typical at +2.7V - supports >1-year battery life in always-on sensor nodes drawing <500µA total system current. |
| Gain-Bandwidth Product | 1.3MHz - sufficient for anti-aliasing filters, transimpedance amplifiers up to ~100kHz, and audio preamp stages. |
| Input Common-Mode Range | VEE − 0.2V to VCC − 0.8V - allows input signals to swing below ground in single-supply configurations, critical for AC-coupled sensor interfaces. |
| Output Voltage Swing | Within 40mV of either rail into 2kΩ - preserves dynamic range in 8-bit ADC interfaces requiring full-scale utilization. |
| Input Offset Voltage | 1–6mV (25°C) - suitable for DC-coupled thermistor or strain gauge amplification where offset drift <6µV/°C is acceptable. |
| Slew Rate | 1V/µs - limits large-signal settling time to ≤2µs for 2V step inputs, adequate for slow-control loops and data acquisition sampling ≤100ksps. |
Pinout & Package
The LMX358AUA is housed in an 8-pin µMAX® package (U8-1), measuring 3.05mm × 3.05mm × 0.95mm with exposed thermal pad. This thermally enhanced, space-constrained package supports high-density PCB layouts in portable equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Amplifier 1 output - drives external load or feedback network; rail-to-rail swing enables full utilization of downstream ADC reference. |
| 2 | IN1− | Inverting input for Amp1 - accepts feedback resistor or differential signal path; protected by internal 3.5kΩ series resistors and diode clamps. |
| 3 | IN1+ | Noninverting input for Amp1 - connects to sensor, reference, or signal source; common-mode range extends below ground for true single-supply biasing. |
| 4 | VEE | Negative supply terminal - tied to ground in single-supply use; must be decoupled with 0.1µF capacitor near pin for PSRR optimization. |
| 5 | VCC | Positive supply terminal - accepts +2.3V to +7V; bypassing minimizes noise coupling into sensitive analog inputs. |
| 6 | IN2+ | Noninverting input for Amp2 - electrically isolated from Amp1; supports dual-channel signal conditioning without crosstalk degradation (>80dB @ 1kHz). |
| 7 | IN2− | Inverting input for Amp2 - identical protection and impedance characteristics as IN1−; enables matched dual-filter or instrumentation topologies. |
| 8 | OUT2 | Amplifier 2 output - independent output node; no internal connection to OUT1 - permits separate gain/phase tuning per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers usable 40mV headroom to both rails into 2kΩ, preserving >98% of full-scale ADC range in 3.3V systems. |
| No phase reversal on overdrive | Prevents catastrophic latch-up when inputs exceed common-mode limits - eliminates need for external clamping diodes in noisy environments. |
| No crossover distortion | Ensures clean zero-crossing in AC-coupled audio paths and precision waveform generation without harmonic artifacts. |
| Unity-gain stability with 400pF load | Permits direct driving of ADC input capacitance or long PCB traces without external compensation networks. |
| Input common-mode range below ground | Supports true single-supply operation with bipolar input signals (e.g., ±100mV sensor outputs) without level-shifting circuitry. |
Applications
| Cellular Phone Audio Codec Interface | Laptop Battery Fuel Gauge Signal Chain |
|---|---|
Use Scenario: Amplifying microphone bias voltage and conditioning analog audio signals before ADC conversion in slim-profile smartphones. IC Role / Device Role / Timing Role: Dual op amp providing simultaneous mic preamplification (Amp1) and headphone driver buffering (Amp2) with rail-to-rail output swing. Use Value: 210µA per amplifier enables >300-hour standby with audio subsystem active; 40mV rail margin ensures full 12-bit ADC utilization at 2.85V supply. |
Use Scenario: Amplifying voltage drops across sense resistors in lithium-ion battery monitoring circuits inside ultrabooks. IC Role / Device Role / Timing Role: Dual-channel current-sense amplifier (Amp1) and reference buffer (Amp2) operating from shared 3.3V rail. Use Value: Input common-mode range down to −0.2V accommodates shunt-based sensing below ground; 1.3MHz GBW supports fast transient detection during charge/discharge switching. |
| Portable ECG Front-End | Industrial Handheld Data Logger |
Use Scenario: Low-noise amplification of biopotential signals (0.5–100Hz) in battery-powered electrocardiogram devices. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier core (Amp1) and right-leg drive buffer (Amp2) in 3-op-amp topology. Use Value: 66nV/√Hz input voltage noise at 1kHz and 0.13pA/√Hz current noise minimize added SNR degradation; 210µA ICC extends clinical-grade device runtime beyond 72 hours. |
Use Scenario: Signal conditioning for multi-sensor inputs (temperature, humidity, pressure) in field-deployable environmental monitors. IC Role / Device Role / Timing Role: Dual-channel sensor interface: one amplifier for RTD linearization, second for capacitive humidity sensor buffering. Use Value: −40°C to +125°C guaranteed operation ensures reliability in uncontrolled outdoor enclosures; rail-to-rail output drives SAR ADCs directly without external level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual, low-voltage, rail-to-rail output op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV358IDR | Higher quiescent current (180µA per amp vs. 210µA typ), wider input common-mode range (to VCC − 0.1V), but lower PSRR (70dB vs. 82dB min). | Preferred in cost-sensitive consumer electronics where PSRR is less critical than BOM count reduction. | Select LMV358IDR only if existing TI-based designs require drop-in compatibility and supply rejection above 10kHz is not required. |
| MCP6022-I/SN | Lower input offset voltage (250µV max vs. 6mV max), higher GBW (10MHz), but higher ICC (1mA per amp) and narrower common-mode range (VEE to VCC − 1.2V). | Better suited for precision DC-coupled applications like weigh scales, but incompatible with sub-1V headroom requirements. | Choose MCP6022-I/SN when microvolt-level offset stability is mandatory and power budget allows 5× higher current draw. |
Compared with LMV358IDR and MCP6022-I/SN, the LMX358AUA uniquely balances ultra-low ICC, rail-to-rail output, sub-ground input capability, and 1.3MHz bandwidth - making it optimal for space-constrained, battery-operated systems needing robust single-supply analog performance without precision-grade cost or power penalties.
Availability
LMX358AUA is available at Aetrix Electronics and suitable for portable medical devices, battery fuel gauges, handheld test equipment, and industrial sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMX358AUA 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The LMX321/LMX358/LMX324 family was engineered specifically for low-voltage, battery-powered equipment requiring rail-to-rail output swing, minimal quiescent current, and small-footprint packaging - targeting portable instrumentation and wearable health devices.
FAQ
What is the maximum capacitive load the LMX358AUA can drive without oscillation?
The LMX358AUA is unity-gain stable and rated to drive capacitive loads up to 400pF while maintaining ≥64° phase margin. Driving larger loads (e.g., >600pF) requires an isolation resistor (typically 10–100Ω) between the output and capacitor to restore stability, as confirmed in Figure 5 of the official datasheet. This behavior is consistent across both amplifiers in the LMX358AUA package.
Does the LMX358AUA support true single-supply operation with inputs below ground?
Yes. The LMX358AUA specifies an input common-mode voltage range of VEE − 0.2V to VCC − 0.8V. When VEE = 0V (single-supply configuration), inputs may swing to −0.2V - enabling direct interfacing with AC-coupled sensors or bipolar signal sources without external level-shifting circuitry. This capability is explicitly verified across −40°C to +125°C for the LMX358AUA.
What is the thermal performance of the LMX358AUA in the µMAX-8 package?
The LMX358AUA in the 8-pin µMAX package (U8-1) has a thermal resistance θJA of 222°C/W (calculated from 362mW max power dissipation at TA = +70°C). At 420µA total supply current and +5V supply, power dissipation is ~2.1mW - resulting in negligible junction temperature rise (<0.5°C) under typical conditions. The exposed pad enhances thermal conduction when soldered to PCB copper.
How does the LMX358AUA compare to the LMV358 in terms of input protection?
The LMX358AUA incorporates internal 3.5kΩ series input resistors and back-to-back triple diode stacks across inputs (per Figure 1), limiting differential input fault current to <100µA for ±5V transients. In contrast, the LMV358 lacks integrated diode clamps and relies solely on series resistors - making the LMX358AUA more robust against ESD and overvoltage events in portable equipment where connector exposure is common.
Is the LMX358AUA pin-compatible with other dual op amps in the same package footprint?
No. The LMX358AUA uses a nonstandard µMAX-8 pinout (OUT1, IN1−, IN1+, VEE, VCC, IN2+, IN2−, OUT2) that differs from industry-standard SO-8 or TSSOP-8 dual op amp layouts. It is pin-compatible only with other LMX358 variants (e.g., LMX358AKA-T in SOT23-8), not with generic dual op amps like TL072 or MCP6022. Layout reuse requires verification against the LMX358AUA-specific pin map.
LMX358AUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- 1.3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 18 nA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 240µA (x2 Channels)
- Current - Output / Channel:
- 28 mA
- Voltage - Supply Span (Min):
- 2.3 V
- Voltage - Supply Span (Max):
- 7 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
LMX358AUA FAQ
1.How can I place an order for LMX358AUA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX358AUA 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 LMX358AUA reliable?
The price and inventory of LMX358AUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX358AUA is usually 5 days.
3.What payment methods are accepted for LMX358AUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX358AUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX358AUA?
LMX358AUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX358AUA 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 LMX358AUA?
For technical support, including LMX358AUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX358AUA requirements.
6.How does Aetrix verify that LMX358AUA is sourced from the original manufacturer or authorized distributors?
All LMX358AUA 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 LMX358AUA meets industry standards.
7.What is the process for return or replacement of LMX358AUA?
All LMX358AUA units undergo pre-shipment inspection (PSI). If there is an issue with LMX358AUA, 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 LMX358AUA part is unused and in its original packaging.
Return procedure for LMX358AUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMX358AUA Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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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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