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Analog Devices Inc./Maxim Integrated LMX358AKA+T
- Part No.:
- LMX358AKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
LMX358AKA+T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,773
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Product details
Overview
LMX358AKA+T 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 LMX358AKA+T datasheet, LMX358AKA+T pinout, LMX358AKA+T application, or LMX358AKA+T equivalent, this page provides verified electrical parameters, SOT23-8 package layout, real-world use cases in low-power analog circuits, and validated alternative op amps with documented functional trade-offs.
Technical Context
The LMX358AKA+T implements a bipolar input stage with internal 3.5kΩ series resistors and back-to-back diode clamps for ±1.8V differential input protection. Its rail-to-rail output stage uses complementary emitter-follower drivers to achieve 40mV swing margins at 2kΩ loads across -40°C to +125°C.
It is unity-gain stable and supports capacitive loads up to 400pF without external compensation. The device exhibits no phase reversal on overdriven inputs and eliminates crossover distortion via seamless Class AB biasing - critical for accurate DC-coupled amplification in instrumentation and active filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.3V to +7V single supply - enables direct integration with Li-ion, coin-cell, and 3.3V/5V logic rails |
| Quiescent Current | 210µA total (105µA per amp) at +2.7V - extends battery life in always-on sensor nodes |
| Gain-Bandwidth Product | 1.3MHz - supports audio-band amplification and anti-aliasing filters up to ~100kHz |
| Output Swing | Within 40mV of VCC and VEE into 2kΩ - preserves dynamic range near supply rails in single-supply configurations |
| Input Common-Mode Range | VEE − 0.2V to VCC − 0.8V - accepts ground-referenced inputs while maintaining CMRR > 72dB |
| Input Offset Voltage | 1–6mV (typ) at +25°C - suitable for medium-precision DC amplification without trimming |
| Slew Rate | 1V/µs - handles 10kHz full-scale sine waves with <1% distortion at unity gain |
Pinout & Package
LMX358AKA+T is housed in an 8-pin SOT23-8 package (JEDEC MO-178AA), measuring 2.95mm × 1.60mm × 1.10mm, with gull-wing leads and 0.65mm pitch - compatible with standard reflow profiles and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Amplifier 1 output - drives loads directly; requires local 0.1µF bypass to VCC |
| 2 | IN1− | Inverting input for Amp 1 - high-impedance node; sensitive to stray capacitance |
| 3 | IN1+ | Noninverting input for Amp 1 - accepts signals down to VEE − 0.2V |
| 4 | VEE | Negative supply - tied to GND in single-supply operation |
| 5 | VCC | Positive supply - must be decoupled within 2mm of pin |
| 6 | IN2− | Inverting input for Amp 2 - electrically isolated from Amp 1 inputs |
| 7 | IN2+ | Noninverting input for Amp 2 - shares same input voltage range as IN1+ |
| 8 | OUT2 | Amplifier 2 output - independent output stage; no crosstalk above −120dB @ 1kHz |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full-scale signal fidelity near supply rails - eliminates level-shifting circuitry in single-supply designs |
| No phase reversal on overdrive | Prevents catastrophic latch-up when inputs exceed common-mode limits - enhances system robustness in transient-prone environments |
| Unity-gain stability with 400pF load | Enables direct driving of ADC input capacitors or long traces without isolation resistors |
| Input common-mode range below ground | Supports true bipolar signal acquisition (e.g., ±1.35V supplies) without external bias networks |
| Low 105µA per-amplifier current | Reduces thermal drift and power supply noise coupling - improves SNR in multi-amp sensor arrays |
Applications
| Portable Audio Preamp | Low-Power Sensor Signal Chain |
|---|---|
Use Scenario: Amplifying microphone or piezoelectric sensor outputs in Bluetooth earbuds with 3.0V coin-cell supply. IC Role / Device Role / Timing Role: Dual-channel DC-coupled preamplifier providing gain and buffering before ADC sampling. Use Value: Rail-to-rail output swing preserves 98% of available dynamic range; 210µA total supply current extends playback time by >12 hours vs. legacy LMV358. | Use Scenario: Conditioning thermistor and ambient light sensor outputs in wearable health monitors. IC Role / Device Role / Timing Role: Dual op amp configured as transimpedance amplifier and reference buffer in analog front-end. Use Value: Input common-mode range extending 0.2V below ground allows direct connection to grounded sensors; low offset drift (6µV/°C) maintains calibration accuracy across body temperature range. |
| Active Filter for IoT Node | Battery Voltage Monitor |
Use Scenario: Implementing 2nd-order low-pass filter (fc = 10kHz) in LoRaWAN end-node to suppress RF interference. IC Role / Device Role / Timing Role: Dual op amp used in Sallen-Key topology - one section as integrator, second as gain stage. Use Value: 1.3MHz GBW ensures filter response remains stable and monotonic; unity-gain stability with 400pF supports ceramic filter capacitor integration without tuning. | Use Scenario: Scaling and comparing LiPo battery voltage (3.0–4.2V) against 1.25V reference in smart battery gauge. IC Role / Device Role / Timing Role: Dual op amp operating as precision resistor-divider buffer and comparator hysteresis generator. Use Value: 40mV output swing margin ensures reliable detection of 3.3V brown-out threshold even at end-of-life battery voltage (3.0V); low PSRR (96dB) rejects switching regulator ripple. |
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 170µA/amplifier current; 1MHz GBW; input range limited to VEE to VCC − 1.5V | Less suitable for sub-3V battery operation or ground-sensing circuits | Choose when cost sensitivity outweighs ultra-low power and extended input range needs |
| MCP6022-E/SN | CMOS input (1pA IB), 10MHz GBW, but 1mA/amplifier supply current and no below-ground input capability | Preferred for high-impedance pH or photodiode sensors, not for low-power portable systems | Choose only if femtoampere input bias is mandatory and battery life is secondary |
Compared with LMV358IDR and MCP6022-E/SN, the LMX358AKA+T uniquely balances ultra-low quiescent current, true rail-to-rail output, and sub-ground input capability - making it optimal for compact, battery-constrained analog signal chains where power, precision, and supply flexibility are co-constrained.
Availability
LMX358AKA+T is available at Aetrix Electronics and suitable for portable audio preamps, low-power sensor signal chains, active filters for IoT nodes, and battery voltage monitors requiring stable component supply across industrial and consumer production cycles.
Supply support for LMX358AKA+T 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 industrial, automotive, and communications markets.
The LMX358AKA+T belongs to Maxim's LMX3xx family of low-voltage, rail-to-rail op amps designed specifically for portable and battery-powered equipment where supply headroom, power efficiency, and small footprint are critical.
FAQ
What is the maximum capacitive load the LMX358AKA+T can drive without oscillation?
The LMX358AKA+T 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 - confirmed in Figure 5 of the official datasheet. This behavior is consistent across all temperatures and supply voltages from +2.3V to +7V.
Does the LMX358AKA+T support true single-supply operation with input signals at ground potential?
Yes. The LMX358AKA+T features an input common-mode voltage range extending to VEE − 0.2V, allowing it to accept signals at 0V when VEE = 0V (i.e., single-supply configuration). This is verified in Electrical Characteristics tables showing VCM minimum = −0.2V at +25°C and −0.1V over full temperature range - enabling direct interfacing with grounded sensors and DAC outputs.
What is the typical output voltage swing of the LMX358AKA+T into a 2kΩ load at +3.3V supply?
At +3.3V supply and TA = +25°C, the LMX358AKA+T typically swings within 40mV of both rails into a 2kΩ load - i.e., VOH ≈ 3.26V and VOL ≈ 0.04V. This is explicitly specified in the "Output-Voltage Swing" row of the Electrical Characteristics table under VCC = +2.7V conditions and confirmed in Typical Operating Characteristic plot toc08, which shows <50mV swing loss across 2.3–7V supply range.
Is the LMX358AKA+T pin-compatible with the LMV358 family?
Yes - the LMX358AKA+T is explicitly described as a pin-to-pin compatible upgrade to the LMV358 family. Both devices use identical 8-pin SOT23-8 pinouts (OUT1, IN1−, IN1+, VEE, VCC, IN2−, IN2+, OUT2), share the same footprint, and require no PCB changes. This compatibility is stated in the General Description and confirmed in the Pin Configurations diagram and Ordering Information table.
What is the operating temperature range guaranteed for the LMX358AKA+T?
The LMX358AKA+T is specified and tested over an operating temperature range of −40°C to +125°C. This is documented in the Ordering Information table and reinforced in Electrical Characteristics sections labeled "TA = −40°C to +125°C", including parameters such as input offset voltage, supply current, and output swing - ensuring reliability in automotive under-hood and industrial edge environments.
LMX358AKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- 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:
- SOT-23-8
LMX358AKA+T FAQ
1.How can I place an order for LMX358AKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX358AKA+T 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+T reliable?
The price and inventory of LMX358AKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX358AKA+T is usually 5 days.
3.What payment methods are accepted for LMX358AKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX358AKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX358AKA+T?
LMX358AKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX358AKA+T 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+T?
For technical support, including LMX358AKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX358AKA+T requirements.
6.How does Aetrix verify that LMX358AKA+T is sourced from the original manufacturer or authorized distributors?
All LMX358AKA+T 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+T meets industry standards.
7.What is the process for return or replacement of LMX358AKA+T?
All LMX358AKA+T units undergo pre-shipment inspection (PSI). If there is an issue with LMX358AKA+T, 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+T part is unused and in its original packaging.
Return procedure for LMX358AKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMX358AKA+T Tags
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