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Analog Devices Inc./Maxim Integrated LMX358AKA+
- Part No.:
- LMX358AKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
LMX358AKA+.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:819
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Product details
Overview
LMX358AKA+ 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 (typ), delivers 1.3MHz gain-bandwidth, 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 LMX358AKA+ datasheet, LMX358AKA+ pinout, LMX358AKA+ application, or LMX358AKA+ equivalent, this page provides verified package mapping (SOT23-8), confirmed DC/AC specifications at +2.7V/+5V, validated rail-to-rail output behavior, input common-mode range extending 0.2V below ground, and real-world capacitive-load stability up to 400pF.
Technical Context
The LMX358AKA+ implements a bipolar-input, rail-to-rail output stage with no phase reversal on overdriven inputs and no crossover distortion. Its unity-gain stable architecture supports driving resistive loads down to 2kΩ and capacitive loads up to 400pF without external compensation.
Input protection includes 3.5kΩ series resistors and back-to-back diode clamps, limiting differential input voltage stress. The device achieves 72dB CMRR and 82dB PSRR over its full operating temperature range (–40°C to +125°C) while maintaining 105µA per amplifier quiescent current at VCC = +2.7V.
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 |
| Quiescent Current | 210µA (typ) per dual amplifier at +2.7V - extends battery life in always-on sensor front-ends |
| Gain-Bandwidth Product | 1.3MHz - supports stable closed-loop gain ≥10 at audio frequencies (≤130kHz) |
| Output Swing | Within 40mV of rails into 2kΩ - preserves dynamic range in 3.3V ADC interfaces |
| Input Common-Mode Range | VEE – 0.2V to VCC – 0.8V - accepts signals below ground in single-supply transducer amplification |
| CMRR / PSRR | 72dB / 82dB (min) - rejects power rail noise and common-mode interference in noisy embedded environments |
| Slew Rate | 1V/µs - handles 10kHz full-scale sine waves with <1% distortion at 2Vpp |
Pinout & Package
LMX358AKA+ is housed in an 8-pin SOT23-8 package (JEDEC MO-178AA), measuring 2.95mm × 1.6mm × 1.1mm, with gull-wing leads and 0.65mm pitch. This ultra-compact outline supports high-density PCB layouts in space-constrained portable devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Amplifier 1 output - drives analog signal chain stages with rail-to-rail swing |
| 2 | IN1− | Inverting input for Amp1 - accepts feedback networks for precise gain setting |
| 3 | IN1+ | Noninverting input for Amp1 - connects to low-impedance sensor sources or reference voltages |
| 4 | VEE | Negative supply - tied to ground in single-supply operation; enables true sub-ground input range |
| 5 | VCC | Positive supply - bypassed with 0.1µF capacitor near pin for stable high-frequency PSRR |
| 6 | IN2− | Inverting input for Amp2 - isolated from Amp1 for dual-channel signal processing |
| 7 | IN2+ | Noninverting input for Amp2 - supports independent biasing and signal routing |
| 8 | OUT2 | Amplifier 2 output - enables simultaneous conditioning of two analog channels |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full 0–VCC dynamic range into 2kΩ, maximizing SNR in 3.3V data acquisition systems |
| No phase reversal on overdrive | Prevents latch-up and signal corruption when inputs exceed common-mode limits - critical for fault-tolerant sensor interfaces |
| Input common-mode range to VEE − 0.2V | Accepts grounded or negative-referenced transducer outputs without level-shifting circuitry |
| Unity-gain stable with 400pF load | Eliminates need for isolation resistors in RC-filtered outputs, reducing BOM count and board area |
| Low 105µA per amplifier ICC | Enables continuous monitoring in energy-harvesting nodes with µA-level average current budgets |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Amplifying low-amplitude ECG or pulse oximeter photodiode signals in battery-operated patient monitors. IC Role / Device Role / Timing Role: Dual-channel transducer signal conditioner with matched DC performance across both amplifiers. Use Value: 72dB CMRR rejects 50/60Hz mains interference; rail-to-rail output maximizes ADC utilization without external level shifters. | Use Scenario: Signal buffering and gain staging in compact multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Dual op amp providing independent input buffering and active filtering paths. Use Value: 1.3MHz GBW supports accurate 100kHz sine wave reproduction; 210µA total ICC enables >100hr runtime on AA batteries. |
| Low-Power Industrial I/O Modules | Wireless Sensor Node Front-Ends |
Use Scenario: Conditioning 4–20mA loop sensor outputs and thermocouple signals in remote PLC analog inputs. IC Role / Device Role / Timing Role: Precision dual amplifier handling both current-to-voltage conversion and cold-junction compensation. Use Value: Input range extending below ground accommodates thermocouple polarity reversals; –40°C to +125°C rating ensures field reliability. | Use Scenario: Amplifying MEMS accelerometer and humidity sensor outputs prior to ADC sampling in Zigbee/Bluetooth LE nodes. IC Role / Device Role / Timing Role: Low-quiescent dual op amp enabling always-on wake-on-motion detection. Use Value: 210µA ICC allows microamp-level sleep current budgets; no crossover distortion preserves signal fidelity at sub-mV levels. |
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 170µA/amplifier ICC at +2.7V; 1MHz GBW; same SOT23-8 package | Marginally lower bandwidth limits 100kHz+ signal fidelity; higher current reduces battery life in ultra-low-power designs | Select LMV358IDR only if legacy compatibility with TI's LMV358 footprint is required and 300kHz GBW suffices |
| TSV912IDT | 1.9MHz GBW; 160µA/amplifier ICC; rail-to-rail input/output; different pinout (SO-8) | Superior speed suits active filter design but requires PCB redesign; not pin-compatible with LMX358AKA+ | Choose TSV912IDT when bandwidth >1.3MHz is mandatory and layout revision is acceptable |
Compared with LMV358IDR and TSV912IDT, LMX358AKA+ uniquely balances ultra-low ICC (210µA), guaranteed rail-to-rail output swing within 40mV of rails, and pinout compatibility with industry-standard dual op amp footprints - making it optimal for space- and power-constrained portable instrumentation where signal integrity and battery longevity are co-prioritized.
Availability
LMX358AKA+ is available at Aetrix Electronics and suitable for portable medical sensors, handheld test equipment, and low-power industrial I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMX358AKA+ 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, medical, and communications applications.
The LMX358AKA+ belongs to Maxim's LMX3xx family of low-voltage, rail-to-rail op amps engineered specifically for battery-powered portable equipment where quiescent current, output swing, and input range must co-optimize under tight PCB area constraints.
FAQ
What is the maximum capacitive load the LMX358AKA+ can drive without oscillation?
The LMX358AKA+ is unity-gain stable and can reliably drive capacitive loads up to 400pF without external compensation. This is verified in the datasheet's Typical Operating Characteristics (Figure 23). For loads exceeding 400pF, a series isolation resistor (e.g., 10–100Ω) between the output and capacitor restores stability, as shown in Figure 5 of the LMX358AKA+ datasheet.
Does the LMX358AKA+ support true single-supply operation with inputs below ground?
Yes. The LMX358AKA+ features an input common-mode voltage range extending to VEE – 0.2V. When VEE is connected to ground (single-supply mode), this allows inputs as low as –0.2V - enabling direct interfacing with grounded sensors or signals that dip slightly negative during transients, without external level-shifting circuitry.
What is the typical output voltage swing of the LMX358AKA+ into a 2kΩ load at VCC = +3.3V?
At VCC = +3.3V and TA = +25°C, the LMX358AKA+ typically swings within 40mV of both rails into a 2kΩ load. This means VOH ≈ 3.26V and VOL ≈ 0.04V, delivering 3.22V of usable output range - critical for maximizing resolution in 12-bit ADC systems powered from 3.3V rails.
Is the LMX358AKA+ pin-compatible with the LMV358 family?
Yes. The LMX358AKA+ is explicitly designed as a pin-to-pin compatible upgrade to the LMV358 family. Both use identical 8-pin SOT23-8 pinouts (OUT1, IN1−, IN1+, VEE, VCC, IN2−, IN2+, OUT2), allowing drop-in replacement without PCB modification - provided system-level validation confirms matching AC performance requirements.
What is the input bias current specification for the LMX358AKA+ at +25°C and VCC = +2.7V?
At TA = +25°C and VCC = +2.7V, the LMX358AKA+ has a typical input bias current of 18nA, with a maximum of 50nA across the full operating temperature range (–40°C to +125°C). This low bias current minimizes voltage errors in high-impedance sensor interfaces such as photodiode transimpedance amplifiers.
LMX358AKA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- SOT-23-8
LMX358AKA+ FAQ
1.How can I place an order for LMX358AKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX358AKA+ 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 LMX358AKA+ reliable?
The price and inventory of LMX358AKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX358AKA+ is usually 5 days.
3.What payment methods are accepted for LMX358AKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX358AKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX358AKA+?
LMX358AKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX358AKA+ 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 LMX358AKA+?
For technical support, including LMX358AKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX358AKA+ requirements.
6.How does Aetrix verify that LMX358AKA+ is sourced from the original manufacturer or authorized distributors?
All LMX358AKA+ 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 LMX358AKA+ meets industry standards.
7.What is the process for return or replacement of LMX358AKA+?
All LMX358AKA+ units undergo pre-shipment inspection (PSI). If there is an issue with LMX358AKA+, 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 LMX358AKA+ part is unused and in its original packaging.
Return procedure for LMX358AKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMX358AKA+ Tags
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