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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:2,371
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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 total quiescent current (105µA per amplifier), delivers 1.3MHz gain-bandwidth, and swings within 40mV of both rails into 2kΩ loads - enabling precision signal conditioning in portable audio and sensor front-ends.
For engineers reviewing the LMX358AUA+ datasheet, LMX358AUA+ pinout, LMX358AUA+ application, or LMX358AUA+ equivalent, this page provides verified specifications, µMAX-8 package layout, real-world use cases in low-power analog circuits, and two validated alternative op amps with documented functional and application-level differences.
Technical Context
The LMX358AUA+ integrates two independent bipolar-input op amps in a single 8-pin µMAX package, featuring rail-to-rail output stages and an input common-mode range extending 0.2V below ground (VEE − 0.2V) and up to 0.8V below VCC. Its unity-gain stability supports capacitive loads up to 400pF without external compensation.
Designed as a pin-to-pin upgrade to the LMV358 family, it maintains identical pinout and footprint compatibility while improving input offset voltage (typ. 1–6 mV), PSRR (82–96 dB), and CMRR (72–92 dB) across its full operating temperature range (−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 into Li-ion, coin-cell, and 3.3V/5V systems without level-shifting. |
| Quiescent Current | 210µA total (105µA per amplifier) at +2.7V - extends battery life in always-on sensor nodes and wearable devices. |
| Gain-Bandwidth Product | 1.3MHz - supports stable closed-loop operation up to ~100kHz with moderate gain (e.g., AV = 10), suitable for anti-aliasing and active filtering. |
| Output Voltage Swing | Within 40mV of VCC and VEE into 2kΩ - preserves dynamic range in low-voltage ADC driver and reference buffer applications. |
| Input Common-Mode Range | VEE − 0.2V to VCC − 0.8V - allows ground-referenced inputs and accurate sensing near supply rails in single-supply configurations. |
| Input Offset Voltage | 1–6 mV (typ.) at +25°C - ensures <±10mV error in DC-coupled gain stages with gains ≤100, critical for precision instrumentation front-ends. |
| Slew Rate | 1 V/µs - limits large-signal settling time to ~5µs for 5V step response, adequate for audio line drivers and slow-control loops. |
Pinout & Package
The LMX358AUA+ is housed in an 8-pin µMAX package (U8-1), measuring 3.05mm × 3.05mm × 0.8mm with exposed pad for thermal enhancement. This space-saving, surface-mount package supports high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Amplifier 1 output - drives external load directly; rail-to-rail swing enables full utilization of ADC input range. |
| 2 | IN1− | Inverting input for Amp 1 - connects to feedback network; internal ESD protection prevents latch-up during transient events. |
| 3 | IN1+ | Noninverting input for Amp 1 - accepts sensor or reference signals; common-mode range includes ground for single-supply biasing. |
| 4 | VEE | Negative supply terminal - tied to GND in single-supply mode; must be decoupled with 0.1µF capacitor near pin. |
| 5 | VCC | Positive supply terminal - accepts +2.3V to +7V; bypass capacitor placement minimizes supply noise coupling into amplifiers. |
| 6 | IN2− | Inverting input for Amp 2 - electrically isolated from Amp 1; crosstalk rejection >100dB at 1kHz ensures channel independence. |
| 7 | IN2+ | Noninverting input for Amp 2 - identical electrical characteristics to Pin 3; supports dual-channel signal processing without matching components. |
| 8 | OUT2 | Amplifier 2 output - independently configurable; enables dual-path filtering or differential drive without additional ICs. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output stage | Swings to within 40mV of VCC and VEE into 2kΩ - maximizes signal headroom in 3.3V systems, reducing need for external level-shifting. |
| No phase reversal on overdrive | Prevents output polarity inversion when input exceeds common-mode limits - eliminates erroneous control signals in comparator-like configurations. |
| No crossover distortion | Ensures clean zero-crossing behavior in AC-coupled audio paths and precision integrators, avoiding harmonic artifacts in low-frequency signals. |
| Unity-gain stable with 400pF load | Eliminates need for external compensation networks when driving ADC input capacitance or long traces - simplifies layout and reduces BOM count. |
| Input protection circuitry | Internal 3.5kΩ series resistors and back-to-back diode stacks limit input current to safe levels under ±10V transients - enhances system robustness without external clamps. |
Applications
| Portable Audio Signal Chain | Low-Power Sensor Interface |
|---|---|
|
Use Scenario: Amplifying microphone or MEMS sensor output in Bluetooth earbuds before ADC sampling. IC Role / Device Role / Timing Role: Dual-channel DC-coupled preamplifier and filter driver; second amplifier used for active low-pass filtering. Use Value: 105µA per amplifier enables multi-day battery life; rail-to-rail output ensures full 0–3.3V ADC range utilization without clipping. |
Use Scenario: Conditioning thermistor or bridge-sensor outputs in wireless environmental monitors. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end (gain = 100) with matched dual channels for ratiometric measurement. Use Value: Input common-mode range down to VEE − 0.2V allows direct ground-referenced sensor biasing; low VOS drift (6 µV/°C) maintains accuracy over temperature. |
| Active Filter for Wearables | Low-Voltage Reference Buffer |
|
Use Scenario: Implementing 2nd-order Sallen-Key low-pass filter in heart-rate monitor analog front-end. IC Role / Device Role / Timing Role: Dual op amp configured as unity-gain buffer + filter stage; GBW = 1.3MHz supports cutoff up to 10kHz. Use Value: Unity-gain stability with 400pF capacitive loads eliminates need for isolation resistors - saves board space and component cost. |
Use Scenario: Buffering bandgap reference voltage for multiple ADCs and DACs in compact IoT node. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage follower; second amplifier buffers auxiliary reference or calibration signal. Use Value: PSRR >82dB suppresses supply ripple; 65nV/√Hz input noise avoids degrading reference SNR in 12-bit+ data converters. |
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 |
|---|---|---|---|
| LMV358IDR | Higher quiescent current (220µA vs. 210µA), lower GBW (1MHz vs. 1.3MHz), same SOT23-8 pinout but different µMAX-8 footprint. | Less suitable for ultra-low-power designs requiring >100kHz bandwidth; requires PCB redesign due to package mismatch. | Select only if µMAX-8 footprint is unavailable and SOT23-8 layout already exists; verify thermal performance under continuous load. |
| TLV2372IDR | CMOS input (IB = 1pA vs. 18–50nA), higher VOS (3–9mV), same 1.3MHz GBW and rail-to-rail output, SO-8 package. | Better for high-impedance sensor sources (e.g., pH electrodes); less ideal for low-VOS precision where bipolar input offers tighter matching. | Choose when input bias current dominates error budget; avoid if low-frequency noise or VOS drift is critical - TLV2372 has higher 1/f noise. |
Compared with LMX358AUA+, LMV358IDR trades minor bandwidth reduction for broader distributor availability in SOT23-8, while TLV2372IDR shifts to CMOS architecture for femtoampere bias current at the expense of increased offset drift and 1/f noise - making each suitable for distinct analog signal-chain priorities.
Availability
LMX358AUA+ is available at Aetrix Electronics and suitable for portable audio systems, battery-powered sensor nodes, and low-voltage industrial monitoring equipment requiring stable component supply across extended temperature ranges (−40°C to +125°C).
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.
The LMX358AUA+ belongs to Maxim's LMX3xx low-voltage op amp product line, engineered specifically for energy-constrained, space-sensitive applications where rail-to-rail output swing, sub-1mA supply current, and robust single-supply operation are essential.
FAQ
What is the operating temperature range for the LMX358AUA+?
The LMX358AUA+ is rated for continuous operation from −40°C to +125°C. This extended industrial temperature range is verified across all key parameters including input offset voltage, supply current, and output swing - ensuring reliable performance in automotive cabin modules, outdoor IoT sensors, and industrial motor controllers where ambient temperatures fluctuate widely. The LMX358AUA+ maintains functionality even during thermal cycling stress tests.
Does the LMX358AUA+ support single-supply operation?
Yes, the LMX358AUA+ is explicitly designed for single-supply operation from +2.3V to +7V. Its input common-mode range extends 0.2V below ground (VEE − 0.2V), and its rail-to-rail output can swing within 40mV of both supply rails into 2kΩ loads. This allows direct interfacing with ground-referenced sensors and microcontroller ADCs without external level-shifting circuitry - a core design goal confirmed in the device's General Description and Electrical Characteristics tables.
What package type is used for the LMX358AUA+?
The LMX358AUA+ uses the 8-pin µMAX package (package code U8-1), a proprietary Maxim outline measuring 3.05mm × 3.05mm × 0.8mm with an exposed thermal pad. This differs from standard SO-8 or SOT23-8 footprints and is documented in the Ordering Information table and Package Information section (drawing 21-0036). The µMAX package enables high-density layouts while providing better thermal performance than comparable SOT packages.
Can the LMX358AUA+ drive capacitive loads without oscillation?
Yes, the LMX358AUA+ is unity-gain stable and characterized to drive capacitive loads up to 400pF without external compensation. This capability is explicitly stated in the General Description and confirmed in Typical Operating Characteristics (Figure 20–21). For loads exceeding 400pF, adding a small series resistor (e.g., 10–50Ω) between the output and capacitor restores stability - a technique validated in the Applications Information section.
How does the LMX358AUA+ compare to the LMV358 in terms of pin compatibility?
The LMX358AUA+ is a pin-to-pin compatible upgrade to the LMV358 family in the same package variant - but only when both devices share identical footprints. While LMX358AUA+ uses µMAX-8 (U8-1), standard LMV358 variants commonly use SO-8 or SOT23-8. Therefore, LMX358AUA+ is pin-compatible with LMV358 versions offered in µMAX-8 (e.g., LMV358MA/NOPB), not with SO-8 or SOT23-8 variants. This distinction is clearly noted in the Ordering Information table and Selector Guide.
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
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