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Analog Devices Inc./Maxim Integrated MAX4091AUA+
- Part No.:
- MAX4091AUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4091AUA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,705
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Product details
Overview
MAX4091AUA+ from Maxim Integrated is a single-channel, micropower, rail-to-rail input/output operational amplifier optimized for low-voltage, single-supply operation (2.7V to 6V), featuring 30µV input offset voltage, 500kHz gain-bandwidth product, and 165µA max quiescent current per amplifier - ideal for precision signal conditioning in battery-powered portable instrumentation.
For engineers reviewing the MAX4091AUA+ datasheet, MAX4091AUA+ pinout, MAX4091AUA+ application, or MAX4091AUA+ equivalent, key selection criteria include its beyond-the-rails™ input stage, unity-gain stability with ≥2000pF capacitive loads, rail-to-rail output swing into 1kΩ, -40°C to +125°C operating range, and µMAX-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX4091AUA+ employs a complementary bipolar input stage (NPN/PNP parallel architecture) enabling common-mode input voltage extension 50mV beyond both supply rails (VEE − 0.05V to VCC + 0.05V) without phase reversal, while maintaining high CMRR (90dB typ) and PSRR (100dB typ). Its folded-cascode output stage delivers rail-to-rail output swing within 130mV of VCC and 80mV of VEE under 1kΩ load.
Designed for ultra-low-power precision, the device achieves 12nV/√Hz input voltage noise density at 10kHz and remains stable driving ≥2000pF capacitive loads in unity-gain configuration - a critical advantage over standard CMOS rail-to-rail op amps in sensor interface and data acquisition front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 6V single supply - enables direct integration into Li-ion, coin-cell, and 3.3V/5V systems without level-shifting. |
| Input Offset Voltage | 30µV max - ensures <±0.3mV error in 100mV full-scale sensor outputs at room temperature. |
| Quiescent Current | 165µA max per amplifier - supports >1-year battery life in wake-on-event sensor nodes with 20µA average current. |
| Gain-Bandwidth Product | 500kHz - sufficient for anti-aliasing filtering and DC-coupled amplification up to ~50kHz signals. |
| Capacitive Load Drive | ≥2000pF stable - eliminates need for isolation resistors in ADC driver, DAC buffer, or piezo transducer interfaces. |
| Input Common-Mode Range | VCC + 0.05V to VEE − 0.05V - accepts inputs beyond supply rails, simplifying biasing in high-side current sensing. |
| Output Voltage Swing | Within 130mV of VCC and 80mV of VEE into 1kΩ - preserves >95% dynamic range at 3V supply for 12-bit+ resolution. |
Pinout & Package
MAX4091AUA+ is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), pin-compatible with industry-standard SO-8 but with 50% smaller footprint and improved thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output node - drives resistive/capacitive loads directly; rail-to-rail swing supports full-supply utilization. |
| 2 | IN− | Inverting input - differential pair node; internal protection diodes limit ±0.7V max differential voltage. |
| 3 | IN+ | Noninverting input - complementary input stage node; matched external source resistance minimizes bias-current-induced offset. |
| 4 | VEE | Negative supply (GND in single-supply mode) - must be bypassed with 0.1µF ceramic capacitor near pin. |
| 5 | VCC | Positive supply (2.7V–6V) - bypassing required; supplies internal bias networks and output stage. |
| 6–8 | N.C. | No internal connection - floating pins; no routing or grounding required. |
Key Features
| Feature | Design Value |
|---|---|
| Beyond-the-Rails™ Inputs | Accepts common-mode voltages 50mV beyond VCC/VEE - eliminates input clamping circuits in high-side shunt monitor designs. |
| No Phase Reversal on Overdrive | Guaranteed non-inverting behavior even when inputs exceed supply rails - prevents latch-up and system faults in transient conditions. |
| Rail-to-Rail Output Swing | Delivers 0.13V headroom to VCC and 0.08V to VEE into 1kΩ - maximizes ADC input range and SNR in low-voltage systems. |
| Unity-Gain Stable with 2000pF | Operates without external compensation in capacitive-load applications like piezoelectric sensor buffers or long-cable drivers. |
| High PSRR & CMRR | 100dB PSRR and 90dB CMRR - rejects supply ripple and common-mode noise in noisy industrial environments. |
Applications
| Portable Medical Sensors | Industrial Process Monitoring |
|---|---|
Use Scenario: Amplifying low-level mV-range signals from ECG electrodes or thermopile IR sensors in handheld diagnostic devices. IC Role / Device Role / Timing Role: Precision DC-coupled signal conditioner with rail-to-rail I/O enabling full utilization of 3V supply and 12-bit ADC reference. Use Value: 30µV offset and 12nV/√Hz noise preserve microvolt-level biopotential resolution; 165µA ICC extends battery life beyond 18 months. |
Use Scenario: Conditioning 4–20mA loop transmitter outputs and RTD bridge signals in factory-floor PLC analog input modules. IC Role / Device Role / Timing Role: Input buffer and level-shifter interfacing field sensors to isolated ADCs, operating across -40°C to +125°C ambient. Use Value: Beyond-the-rails inputs tolerate sensor cable ESD transients; 90dB CMRR rejects 50/60Hz magnetic interference in unshielded enclosures. |
| Data Acquisition Front-Ends | Low-Power IoT Sensor Nodes |
Use Scenario: Driving SAR ADC inputs in multi-channel environmental monitoring systems (temperature, humidity, gas). IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-impedance sensor sources from ADC sampling capacitance. Use Value: Stable with ≥2000pF loads eliminates external RC filters; 500kHz GBW supports settling in <2µs for 1MSPS sampling. |
Use Scenario: Signal conditioning for MEMS accelerometers and digital microphone preamps in battery-powered asset trackers. IC Role / Device Role / Timing Role: Low-noise, low-IQ amplifier enabling duty-cycled operation with sub-µA sleep current via external enable control. Use Value: 165µA max ICC allows >5-year operation on CR2032; rail-to-rail output matches 1.8V logic ADC references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV9001IDBVR | Higher 1MHz GBW but 500µA ICC; 1.8V–5.5V supply; 400µV VOS max | Better bandwidth for AC-coupled audio; higher power disqualifies ultra-low-IQ battery apps | Select TLV9001IDBVR only if bandwidth >500kHz is required and supply current budget allows ≥3× increase. |
| OPA333AIDBVR | Zero-drift architecture; 2µV VOS max; 17µA ICC; 350kHz GBW; 1.8V–5.5V | Superior DC accuracy for µV-level strain gauge bridges; lower speed limits fast step response | Choose OPA333AIDBVR when offset drift over temperature dominates design; accept reduced slew rate (160mV/µs vs. 200mV/µs). |
Compared with TLV9001IDBVR and OPA333AIDBVR, MAX4091AUA+ uniquely balances sub-200µA quiescent current, 500kHz bandwidth, and 30µV offset - making it optimal for cost-sensitive, battery-powered precision analog front-ends where zero-drift isn't mandatory and bandwidth exceeds 350kHz.
Availability
MAX4091AUA+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial process monitoring, and data acquisition front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4091AUA+ 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, communications, and computing markets.
The MAX4091AUA+ belongs to Maxim's precision rail-to-rail op amp family designed specifically for low-voltage, micropower applications demanding DC accuracy, wide input/output dynamic range, and robust capacitive-load drive capability.
FAQ
What is the maximum capacitive load the MAX4091AUA+ can drive stably in unity-gain configuration?
The MAX4091AUA+ is unity-gain stable with capacitive loads up to and exceeding 2000pF, as confirmed in the Electrical Characteristics table and Typical Operating Characteristics (Figure 4). This eliminates the need for external isolation resistors in most sensor buffering and ADC driver applications, preserving DC accuracy and low-frequency response without added components.
Does the MAX4091AUA+ support true rail-to-rail input operation beyond the supply rails?
Yes, the MAX4091AUA+ features Beyond-the-Rails™ inputs, allowing common-mode voltages from VEE − 0.05V to VCC + 0.05V. This capability is verified in the Absolute Maximum Ratings and Electrical Characteristics sections, and ensures reliable operation without phase reversal when inputs exceed supply rails - critical for high-side current sensing and fault-tolerant sensor interfaces.
What is the typical quiescent current of the MAX4091AUA+ at 3V supply and room temperature?
The MAX4091AUA+ draws 130µA typical supply current per amplifier at VCC = 3V and TA = +25°C, with a maximum of 165µA across temperature and process variation. This value is specified in the Electrical Characteristics table under "Supply Current" and is measured with VCM = VCC/2, confirming suitability for multi-year battery operation in always-on sensor nodes.
Can the MAX4091AUA+ operate from dual supplies, and what are the limits?
Yes, the MAX4091AUA+ supports dual-supply operation from ±1.35V to ±3V (i.e., total supply voltage ≤6V), as explicitly stated in the General Description and Absolute Maximum Ratings. This flexibility enables use in legacy industrial systems requiring split-rail biasing while maintaining rail-to-rail input/output performance and low quiescent current.
What package type is used for the MAX4091AUA+, and how does it compare to SO-8?
The MAX4091AUA+ uses the 8-pin µMAX package (3mm × 3mm, 0.8mm height), which is pin-compatible with SO-8 but occupies 50% less board area. Its thinner profile and exposed pad variant improve thermal dissipation, and the package is fully specified in Maxim's Package Information section - ensuring drop-in replacement feasibility where space and thermal constraints exist.
MAX4091AUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.2V/µs
- Gain Bandwidth Product:
- 500 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 nA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 130µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 6 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4091AUA+ FAQ
1.How can I place an order for MAX4091AUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4091AUA+ 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 MAX4091AUA+ reliable?
The price and inventory of MAX4091AUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4091AUA+ is usually 5 days.
3.What payment methods are accepted for MAX4091AUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4091AUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4091AUA+?
MAX4091AUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4091AUA+ 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 MAX4091AUA+?
For technical support, including MAX4091AUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4091AUA+ requirements.
6.How does Aetrix verify that MAX4091AUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4091AUA+ 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 MAX4091AUA+ meets industry standards.
7.What is the process for return or replacement of MAX4091AUA+?
All MAX4091AUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4091AUA+, 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 MAX4091AUA+ part is unused and in its original packaging.
Return procedure for MAX4091AUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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