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Analog Devices Inc./Maxim Integrated LMX358ASA-T
- Part No.:
- LMX358ASA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMX358ASA-T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,526
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Product details
Overview
The LMX358ASA-T from Maxim Integrated is a dual, general-purpose, rail-to-rail output operational amplifier optimized for low-voltage, battery-powered applications. It operates from a single +2.3V to +7V supply, draws 210µA quiescent current per amplifier (420µA total), 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-T datasheet, LMX358ASA-T pinout, LMX358ASA-T application, or LMX358ASA-T equivalent, this page provides verified electrical parameters, validated SO-8 package mapping, confirmed dual-amplifier topology, rail-to-rail output behavior under load, and direct alternatives with documented functional alignment for low-power analog front-end design.
Technical Context
The LMX358ASA-T implements a bipolar-input, rail-to-rail output architecture with input common-mode range extending 0.2V below ground (VEE − 0.2V) and up to 0.8V below VCC. Its unity-gain stable design supports capacitive loads up to 400pF without external compensation.
It features no phase reversal on overdriven inputs and eliminates crossover distortion via complementary output stage design. The device maintains ≥72dB CMRR over −0.2V to +1.8V common-mode range at +2.7V supply, and achieves 65° phase margin with 25dB gain margin at unity gain.
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 systems without level-shifting. |
| Quiescent Current | 210µA per amplifier (420µA total) at +2.7V - supports >1-year battery life in always-on sensor nodes. |
| Gain-Bandwidth Product | 1.3MHz - sufficient for anti-aliasing filters, transimpedance amplifiers, and audio preamps up to ~100kHz. |
| Output Voltage Swing | Within 40mV of VCC and VEE into 2kΩ - preserves full dynamic range in 8-bit ADC interfaces. |
| Input Common-Mode Range | VEE − 0.2V to VCC − 0.8V - allows ground-referenced input signals in single-supply configurations. |
| CMRR | 72dB minimum (−0.2V to +1.8V VCM at +2.7V) - rejects power rail noise in noisy embedded environments. |
| Slew Rate | 1V/µs - supports clean 100kHz sine-wave output at 1Vpp without distortion. |
Pinout & Package
LMX358ASA-T is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body, 1.27mm pitch, JEDEC MS-012 compliant. Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Amplifier 1 output - drives external load or feedback network; rail-to-rail capable. |
| 2 | IN1− | Inverting input for Amp1 - accepts feedback or inverted signal path; high-impedance (3MΩ typical). |
| 3 | IN1+ | Noninverting input for Amp1 - connects to sensor, reference, or signal source; extends 0.2V below ground. |
| 4 | VEE | Negative supply - tied to GND in single-supply operation; defines lower rail for input/output swing. |
| 5 | VCC | Positive supply - accepts +2.3V to +7V; requires local 0.1µF ceramic bypass to VEE. |
| 6 | IN2+ | Noninverting input for Amp2 - independent signal path; identical input range and bias specs as IN1+. |
| 7 | IN2− | Inverting input for Amp2 - used for differential gain stages or active filtering with Amp2. |
| 8 | OUT2 | Amplifier 2 output - fully decoupled from OUT1; supports dual-channel signal processing. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Drives 2kΩ loads to within 40mV of VCC and VEE - maximizes usable voltage range for ADC interfacing. |
| No phase reversal on overdrive | Input stage remains linear beyond common-mode limits - prevents latch-up in sensor saturation events. |
| Unity-gain stability with 400pF load | Operates without external compensation into typical PCB trace capacitance - simplifies layout. |
| Low input bias current (18–50nA) | Minimizes error in high-impedance pH or photodiode circuits - avoids significant offset drift. |
| Input protection diodes + series resistors | Withstands ±10V differential input transients - eliminates need for external clamping in portable ESD-prone designs. |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Amplifying low-level bio-potential signals (ECG, EMG) from dry electrodes in battery-operated monitors. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end with DC-coupled gain and rail-to-rail output buffering. Use Value: 210µA per amplifier enables multi-day operation on coin-cell batteries while maintaining 40mV output headroom for 12-bit ADCs. |
Use Scenario: Signal conditioning and buffer stages in handheld multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Dual op-amp providing precision gain, offset correction, and drive capability for LCD drivers and analog outputs. Use Value: Input common-mode range down to VEE − 0.2V allows direct measurement of ground-referenced signals without level-shifting circuitry. |
| Low-Power Active Filters | Industrial Sensor Transmitters |
Use Scenario: 2nd-order Sallen-Key low-pass filter in wireless temperature/humidity nodes. IC Role / Device Role / Timing Role: Dual op-amp implementing filter topology with one section for gain and one for buffering. Use Value: 1.3MHz GBW ensures flat frequency response up to 10kHz cutoff with <0.1dB passband ripple. |
Use Scenario: 4–20mA loop transmitter front-end converting RTD or thermocouple mV outputs. IC Role / Device Role / Timing Role: Dual op-amp performing cold-junction compensation and current-sense amplification. Use Value: 72dB CMRR suppresses common-mode noise from shared industrial power rails, improving measurement accuracy to ±0.1%FS. |
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 (130µA per amp), wider supply range (+2.7V to +5.5V), same SO-8 package. | Limited to ≤5.5V systems; less suitable for 2.3–3.0V coin-cell designs where LMX358ASA-T's lower VCC min is critical. | Select LMV358IDR only when higher drive strength or legacy TI ecosystem compatibility is required. |
| TLV2372ID | CMOS input (0.5pA IB), lower noise (34nV/√Hz), but 1.4MHz GBW and 550µA total ICC - 30% higher power than LMX358ASA-T. | Better for ultra-high-Z sources (e.g., piezoelectric sensors); unsuitable for multi-year battery life targets due to higher ICC. | Choose TLV2372ID when input bias current <1pA is mandatory; otherwise LMX358ASA-T offers superior power/performance balance. |
Compared with LMV358IDR and TLV2372ID, the LMX358ASA-T uniquely combines sub-2.5V operation, 210µA/amplifier quiescent current, and 72dB CMRR across its full input range - making it the optimal choice for long-life, ground-sensing, single-supply analog signal chains.
Availability
LMX358ASA-T is available at Aetrix Electronics and suitable for portable medical sensors, handheld test equipment, low-power active filters, and industrial sensor transmitters requiring stable component supply across extended production lifecycles.
Supply support for LMX358ASA-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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The LMX358ASA-T belongs to Maxim's LMX3xx family of low-voltage, rail-to-rail op amps engineered specifically for battery-powered instrumentation where supply headroom, power efficiency, and input/output swing are critical system constraints.
FAQ
What is the maximum capacitive load the LMX358ASA-T can drive without oscillation?
The LMX358ASA-T is unity-gain stable and rated to drive capacitive loads up to 400pF directly. This specification is verified per manufacturer test conditions with CL = 200pF and RL ≥ 10kΩ. For loads exceeding 400pF, a series isolation resistor (e.g., 10–100Ω) between the LMX358ASA-T output and the capacitor restores stability, as confirmed in Figure 5 of the official datasheet.
Does the LMX358ASA-T support true single-supply operation with input signals below ground?
Yes. The LMX358ASA-T features an input common-mode voltage range extending to VEE − 0.2V. When VEE is connected to ground (single-supply mode), the device accepts input signals down to −0.2V - enabling accurate amplification of slightly negative transducer outputs without external level-shifting circuitry. This behavior is specified and tested across −40°C to +125°C.
What is the typical output voltage swing of the LMX358ASA-T into a 2kΩ load at +5V supply?
At VCC = +5V and VEE = 0V, the LMX358ASA-T delivers a typical output swing of VCC − VOH = 40mV and VOL = 40mV into a 2kΩ load - meaning it reaches within 40mV of both rails. This value is confirmed in the Electrical Characteristics table (page 4, "Output-Voltage Swing" row) under VCC = +5V, TA = +25°C conditions.
Is the LMX358ASA-T pin-compatible with the LMV358 family?
Yes. The LMX358ASA-T 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 applies directly to the SO-8 variant (LMX358ASA-T and LMV358IDR share identical pinout and footprint).
What is the input offset voltage specification for the LMX358ASA-T over temperature?
The LMX358ASA-T has a maximum input offset voltage of 9mV over the full operating temperature range of −40°C to +125°C, as specified in the "ELECTRICAL CHARACTERISTICS" table on page 3 (TA = −40°C to +125°C, VCC = +2.7V). At +25°C, the typical value is 1–6mV, with a maximum of 6mV guaranteed.
LMX358ASA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
LMX358ASA-T FAQ
1.How can I place an order for LMX358ASA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX358ASA-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 LMX358ASA-T reliable?
The price and inventory of LMX358ASA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX358ASA-T is usually 5 days.
3.What payment methods are accepted for LMX358ASA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX358ASA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX358ASA-T?
LMX358ASA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX358ASA-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 LMX358ASA-T?
For technical support, including LMX358ASA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX358ASA-T requirements.
6.How does Aetrix verify that LMX358ASA-T is sourced from the original manufacturer or authorized distributors?
All LMX358ASA-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 LMX358ASA-T meets industry standards.
7.What is the process for return or replacement of LMX358ASA-T?
All LMX358ASA-T units undergo pre-shipment inspection (PSI). If there is an issue with LMX358ASA-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 LMX358ASA-T part is unused and in its original packaging.
Return procedure for LMX358ASA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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