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Analog Devices Inc./Maxim Integrated LMX358ASA
- Part No.:
- LMX358ASA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMX358ASA.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,130
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Product details
Overview
LMX358ASA 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 per amplifier (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 LMX358ASA datasheet, LMX358ASA pinout, LMX358ASA application, or LMX358ASA equivalent, this page provides verified package mapping (8-pin SO), confirmed dual-amplifier topology, rail-to-rail output behavior, input common-mode range extending 0.2V below ground, and validated alternatives for low-power analog front-ends requiring stable DC performance and capacitive-load drive capability up to 400pF.
Technical Context
The LMX358ASA implements a bipolar-input, rail-to-rail output architecture with no phase reversal on overdriven inputs and no crossover distortion. Its input stage supports VEE − 0.2V to VCC − 0.8V common-mode range (at +2.7V supply), while the output stage sustains ±25mA short-circuit current and drives 2kΩ resistive loads with <40mV headroom to either rail.
It achieves unity-gain stability with 64° phase margin and 24dB gain margin at CL = 200pF, supporting direct connection to moderate capacitive loads without external compensation - a key differentiator versus legacy LMV358 variants that require isolation resistors beyond 100pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.3V to +7V single supply - enables direct integration into Li-ion (3.0–4.2V) and coin-cell (3V) powered systems without regulation. |
| Quiescent Current | 210µA per amplifier (typ @ +2.7V) - allows dual-channel operation in sub-500µA system sleep modes. |
| Gain-Bandwidth Product | 1.3MHz - supports closed-loop gains up to 10× at 100kHz with ≤1% gain error in active filters and sensor amplifiers. |
| Input Offset Voltage | 1–6mV (25°C) - ensures ≤10µV output error in 100× gain configurations with 2kΩ feedback networks. |
| Output Voltage Swing | Within 40mV of rails into 2kΩ - preserves full dynamic range across 0–2.7V ADC input ranges in single-supply data acquisition. |
| Common-Mode Rejection | 72–92dB (−0.2V to +1.8V range) - rejects power supply ripple and PCB noise in noisy embedded environments. |
| Slew Rate | 1V/µs - handles 10kHz sine waves at 1Vpp without distortion in audio preamp and transducer interfaces. |
Pinout & Package
LMX358ASA is housed in an 8-pin SO (Small Outline) package (PKG CODE S8-2), measuring 4.9mm × 3.9mm × 1.75mm, with standard JEDEC MS-012AC footprint and gull-wing leads. This surface-mount package supports automated assembly and provides thermal resistance θJA = 169°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Amplifier 1 output - directly drives ADC inputs, DAC buffers, or LED bias circuits with rail-to-rail swing. |
| 2 | IN1− | Inverting input for Amp1 - connects to feedback network or differential sensing node with 18–50nA bias current. |
| 3 | IN1+ | Noninverting input for Amp1 - accepts sensor signals down to −0.2V relative to VEE (ground in single-supply mode). |
| 4 | VEE | Negative supply terminal - tied to ground for single-supply operation; supports split-rail use down to −0.3V. |
| 5 | VCC | Positive supply terminal - accepts unregulated battery voltage up to +7V; requires local 0.1µF ceramic bypass. |
| 6 | IN2+ | Noninverting input for Amp2 - isolated from Amp1 for dual-sensor readout or independent channel processing. |
| 7 | IN2− | Inverting input for Amp2 - supports unity-gain inverting configuration with matched resistor tolerances ≤1%. |
| 8 | OUT2 | Amplifier 2 output - enables simultaneous signal conditioning paths without cross-talk degradation (≥80dB rejection at 1kHz). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Drives 2kΩ loads to within 40mV of VCC and VEE - eliminates level-shifting circuitry in 3.3V microcontroller interfaces. |
| No phase reversal on overdrive | Prevents latch-up and output inversion when input exceeds common-mode limits - critical for fault-tolerant sensor monitoring. |
| Input common-mode range extends below ground | Accepts signals from −0.2V to VCC − 0.8V - enables direct connection to thermocouples and bridge sensors with negative offset. |
| Unity-gain stable with 400pF capacitive load | Eliminates need for series isolation resistors in LCD bias, piezo driver, and cable-driven applications. |
| Low input bias current (18–50nA) | Minimizes voltage error in high-impedance pH probe and photodiode amplifier circuits with >1MΩ source impedances. |
Applications
| Portable ECG Monitor | Smartphone Ambient Light Sensor |
|---|---|
Use Scenario: Amplifies microvolt-level biopotential signals from dry electrodes while rejecting 50/60Hz mains interference. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end - one amp configures as noninverting gain stage, the other as reference buffer. Use Value: 72dB CMRR and rail-to-rail output preserve signal fidelity across 0–3.3V ADC range without clipping during motion artifacts. | Use Scenario: Conditions current output from ambient light photodiode in ultra-thin bezel designs with strict power budgets. IC Role / Device Role / Timing Role: Transimpedance amplifier with programmable gain - converts photocurrent to voltage while maintaining 1.3MHz bandwidth for fast response. Use Value: 210µA per amplifier enables dual-sensor operation (ALS + proximity) within 500µA total system sleep current. |
| Industrial Temperature Transmitter | Wireless Sensor Node Signal Chain |
Use Scenario: Interfaces with 3-wire RTD bridges in hazardous-area loop-powered 4–20mA transmitters operating from 12–36V supplies. IC Role / Device Role / Timing Role: Precision difference amplifier with Kelvin sensing - rejects lead resistance errors and provides excitation current control. Use Value: Input offset drift of 6µV/°C minimizes temperature measurement error across −40°C to +125°C industrial range. | Use Scenario: Processes analog outputs from MEMS accelerometers and humidity sensors before digitization in battery-operated IoT nodes. IC Role / Device Role / Timing Role: Dual-channel anti-aliasing filter and gain stage - one amp filters accelerometer noise, the other conditions humidity sensor output. Use Value: 1.3MHz GBW supports 10kHz cutoff filters with <0.1dB passband ripple, ensuring accurate spectral content preservation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV358IDR | Higher quiescent current (180µA per amp vs. 210µA typ), lower GBW (1MHz), no guaranteed rail-to-rail output swing below 100mV. | Less suitable for 3V battery systems requiring full-scale ADC utilization; acceptable for cost-sensitive consumer audio where 100mV headroom is tolerable. | Select LMV358IDR only when BOM cost reduction outweighs dynamic range loss in low-voltage signal chains. |
| TLV2372IDR | CMOS input (0.5pA bias current), wider supply range (+2.7V to +16V), but higher supply current (120µA per amp) and reduced output drive into 2kΩ. | Better for high-impedance pH or ion-selective electrode sensors; unsuitable for driving capacitive loads >100pF without external compensation. | Choose TLV2372IDR for ultra-low-input-bias applications; avoid when driving LCD segments or long cables requiring 400pF stability. |
Compared with LMX358ASA, LMV358IDR trades rail-to-rail output fidelity for lower unit cost, while TLV2372IDR prioritizes femtoampere input bias over capacitive-load robustness - making LMX358ASA the optimal choice for dual-channel, low-voltage, rail-to-rail signal conditioning where stability and output swing are design-critical.
Availability
LMX358ASA is available at Aetrix Electronics and suitable for portable medical devices, smartphone sensor subsystems, industrial 4–20mA transmitters, and wireless IoT node signal chains requiring stable component supply across extended temperature ranges (−40°C to +125°C).
Supply support for LMX358ASA 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 LMX358ASA belongs to Maxim's LMX3xx family of low-voltage, rail-to-rail op amps engineered specifically for battery-powered equipment where quiescent current, output swing, and capacitive-load stability must coexist without performance trade-offs.
FAQ
What is the maximum capacitive load the LMX358ASA can drive without external compensation?
The LMX358ASA is unity-gain stable and capable of driving capacitive loads up to 400pF without external isolation resistors or compensation networks. This is verified in the datasheet under AC characteristics with CL = 200pF and confirmed via stability plots showing ≥64° phase margin. For loads exceeding 400pF, a series resistor (e.g., 10–100Ω) between the output and capacitor is recommended to maintain stability. The LMX358ASA's internal compensation enables this robustness without sacrificing bandwidth or slew rate.
Does the LMX358ASA support true single-supply operation with input signals below ground?
Yes, the LMX358ASA supports true single-supply operation with its input common-mode voltage range extending to VEE − 0.2V. When VEE is grounded (single-supply mode), the inputs accept signals down to −0.2V, enabling direct interface with transducers that generate negative offsets - such as thermocouples or bridge sensors with center-tap bias. This feature is explicitly specified in the Electrical Characteristics table under "Input Common-Mode Voltage Range" and confirmed across temperature ranges.
What is the typical quiescent current of the LMX358ASA at +5V supply?
The typical quiescent current of the LMX358ASA at +5V supply is 240µA per amplifier (480µA total for both channels), as specified in the Electrical Characteristics table under "Supply Current" at VCC = +5V and TA = +25°C. This value increases to 420µA total (210µA per amp) at the upper end of the industrial temperature range (−40°C to +125°C). The LMX358ASA maintains consistent current draw across its full 2.3V–7V supply range, with only ±10% variation.
Is the LMX358ASA pin-compatible with the LMV358 family?
Yes, the LMX358ASA is explicitly designed as a pin-to-pin compatible upgrade to the LMV358 family, as stated in the General Description: "LMX321/LMX358/LMX324 are single/dual/quad, low-cost, low-voltage, pin-to-pin compatible upgrades to the LMV321/LMV358/LMV324 family." This compatibility applies to all 8-pin packages including SO (LMX358ASA), SOT23-8 (LMX358AKA-T), and µMAX-8 (LMX358AUA-T), allowing drop-in replacement without PCB layout changes.
What is the output voltage swing specification of the LMX358ASA into a 2kΩ load at +2.7V supply?
At +2.7V supply and TA = +25°C, the LMX358ASA delivers an output voltage swing of VCC − VOH ≤ 50mV and VOL ≤ 60mV into a 2kΩ load - meaning it swings within 50mV of the positive rail and 60mV of the negative rail (ground). These values are specified in the Electrical Characteristics table under "Output-Voltage Swing" and represent worst-case limits; typical performance is tighter (≤40mV rail-to-rail). This ensures >95% of the 0–2.7V range remains usable for ADC interfacing.
LMX358ASA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
LMX358ASA FAQ
1.How can I place an order for LMX358ASA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX358ASA 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 LMX358ASA reliable?
The price and inventory of LMX358ASA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX358ASA is usually 5 days.
3.What payment methods are accepted for LMX358ASA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX358ASA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX358ASA?
LMX358ASA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX358ASA 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 LMX358ASA?
For technical support, including LMX358ASA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX358ASA requirements.
6.How does Aetrix verify that LMX358ASA is sourced from the original manufacturer or authorized distributors?
All LMX358ASA 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 LMX358ASA meets industry standards.
7.What is the process for return or replacement of LMX358ASA?
All LMX358ASA units undergo pre-shipment inspection (PSI). If there is an issue with LMX358ASA, 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 LMX358ASA part is unused and in its original packaging.
Return procedure for LMX358ASA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMX358ASA Tags
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LM358DT
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LM358DR
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LM2904DR
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LM358ADR
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LM2904DGKR
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LM324DR
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MCP6006T-E/OT
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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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