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Analog Devices Inc./Maxim Integrated MAX4091ASA+T
- Part No.:
- MAX4091ASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4091ASA+T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,475
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Product details
Overview
MAX4091ASA+T 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 - enabling high-precision signal conditioning in space-constrained, battery-powered instrumentation.
For engineers reviewing the MAX4091ASA+T datasheet, MAX4091ASA+T pinout, MAX4091ASA+T application, or MAX4091ASA+T equivalent, this page delivers verified electrical specs, SO-8 package terminal mapping, real-world use cases in portable data acquisition, and two validated alternative op amps with documented functional and application-level differences.
Technical Context
The MAX4091ASA+T employs a dual complementary input stage (NPN/PNP) enabling beyond-the-rails™ common-mode input range (VEE − 0.05V to VCC + 0.05V) without phase reversal, while its folded-cascode output stage supports rail-to-rail swing within 15mV of supply rails under 100kΩ load. Its bipolar process ensures low 12nV/√Hz input voltage noise and high DC accuracy.
It achieves unity-gain stability driving ≥2000pF capacitive loads - a key differentiator versus comparable CMOS rail-to-rail op amps - and maintains 60° phase margin at 100pF load with 100kΩ resistive termination, supporting robust performance in sensor buffering and ADC driver applications without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 6V single supply - enables direct interface with Li-ion, 3.3V, and 5V systems without level-shifting. |
| Input Offset Voltage | 30µV max - ensures ≤0.3mV error in 10V full-scale measurement, critical for precision analog front-ends. |
| Quiescent Current | 165µA max per amplifier - allows >1-year battery life in continuous-sensing nodes powered by CR2032 cells. |
| Gain-Bandwidth Product | 500kHz - supports stable closed-loop gain up to 100× at 5kHz, suitable for anti-aliasing and sensor amplification. |
| Input Voltage Noise | 12nV/√Hz at 10kHz - minimizes contribution to total system noise in µV-level biomedical or strain-gauge signals. |
| Capacitive Load Drive | ≥2000pF - eliminates need for isolation resistors when driving ADC sample-and-hold inputs or long PCB traces. |
| Common-Mode Rejection | 90dB min - rejects >30mV of power-supply ripple or ground bounce in noisy industrial environments. |
Pinout & Package
MAX4091ASA+T is housed in an 8-pin SO (Small Outline) package, measuring 4.9mm × 3.9mm × 1.75mm (JEDEC MS-012), with gull-wing leads and standard 1.27mm pitch - compatible with automated SMT assembly and IPC-7351B land patterns.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output node - drives resistive or capacitive loads up to 1kΩ or 2000pF while maintaining rail-to-rail swing. |
| 2 | IN− | Inverting input - accepts differential signals across full rail-to-rail common-mode range; internal protection diodes limit ±0.7V differential stress. |
| 3 | IN+ | Noninverting input - matched bias current path to IN−; requires external resistor balancing for <1µV offset error in high-Z sources. |
| 4 | VEE | Negative supply terminal - tied to GND in single-supply mode; supports split supplies down to ±1.35V. |
| 5 | VCC | Positive supply terminal - bypass with 0.1µF ceramic capacitor near pin to suppress high-frequency PSRR degradation. |
| 6–8 | N.C. | No internal connection - left unconnected; no routing or thermal relief required on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Beyond-the-Rails™ Inputs | Operates with common-mode voltage extending 50mV beyond VEE and VCC - eliminates input clamping diodes in sensor interfaces with overvoltage transients. |
| No Phase Reversal | Guaranteed non-inverting behavior even when inputs exceed supply rails - prevents latch-up and false triggering in comparator-like configurations. |
| Rail-to-Rail Output Swing | Swings within 15mV of VEE/VCC with 100kΩ load - maximizes dynamic range in 3.3V systems, delivering >3.27Vpp output from 3.3V supply. |
| Unity-Gain Stable w/ 2000pF | Stable under heavy capacitive loading without external compensation - simplifies design of anti-aliasing filters and ADC drivers. |
| High PSRR & CMRR | 100dB PSRR and 90dB CMRR - suppresses supply noise and ground shifts in mixed-signal PCBs with shared power domains. |
Applications
| Portable ECG Monitor | Industrial 4–20mA Transmitter |
|---|---|
|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in handheld ECG devices. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail input buffer preceding 16-bit SAR ADC sampling at 1kHz. Use Value: 12nV/√Hz input noise and 30µV offset preserve signal integrity across 0.05–150Hz bandwidth, reducing post-processing calibration overhead. |
Use Scenario: Conditioning sensor output (e.g., RTD or pressure bridge) and driving 4–20mA loop with HART modulation. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with programmable gain and rail-to-rail output swing into loop driver. Use Value: 2.7V–6V operation enables direct interface with 3.3V microcontrollers; 165µA quiescent current minimizes self-heating in sealed enclosures. |
| Smart Gas Detector Sensor Interface | Low-Power Data Logger Analog Front-End |
|
Use Scenario: Amplifying low-current outputs from electrochemical gas sensors (e.g., CO, NO₂) in battery-operated detectors. IC Role / Device Role / Timing Role: Transimpedance amplifier with adjustable feedback resistor, operating from coin-cell supply. Use Value: 20nA input bias current and rail-to-rail input allow accurate integration of pA–nA sensor currents without guard traces or active guarding. |
Use Scenario: Multiplexed analog signal conditioning for temperature, humidity, and light sensors in environmental monitoring nodes. IC Role / Device Role / Timing Role: Channel-selectable buffer and filter stage before multiplexer and 12-bit ADC. Use Value: 500kHz GBW supports fast settling (<12µs to 0.1%) after channel switching; 2000pF load drive eliminates RC filter interaction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision, low-power, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Zero-drift architecture; 0.1µV/°C offset drift vs. MAX4091ASA+T's ±2µV/°C; 17µA IQ vs. 165µA. | Better for DC-critical applications (e.g., weigh scales); less suitable for >10kHz signal paths due to chopper noise peaks. | Select OPA333AIDBVR when ultra-low drift dominates; choose MAX4091ASA+T for wider bandwidth and proven 2000pF capacitive drive. |
| AD8605ARTZ-REEL7 | Higher 1MHz GBW and 5V/µs slew rate; 1pA IB vs. 20nA; 150µA IQ - similar quiescent power. | Preferred for higher-speed sensor interfaces (e.g., piezoelectric vibration sensing); less optimal for ultra-low-bias current electrochemical sensors. | Choose AD8605ARTZ-REEL7 for speed-sensitive designs; retain MAX4091ASA+T where beyond-the-rails input and guaranteed 2000pF stability are mandatory. |
Compared with OPA333AIDBVR and AD8605ARTZ-REEL7, the MAX4091ASA+T uniquely combines true beyond-the-rails input operation, 2000pF capacitive-load immunity, and 30µV offset in a single SO-8 package - making it the only option among the three qualified for simultaneous rail-to-rail input range, high capacitive drive, and sub-100µV offset in battery-powered industrial sensors.
Availability
MAX4091ASA+T is available at Aetrix Electronics and suitable for portable medical devices, industrial 4–20mA transmitters, smart gas detectors, and low-power data loggers requiring stable component supply across extended temperature ranges (−40°C to +125°C).
Supply support for MAX4091ASA+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 and mixed-signal ICs for industrial, automotive, communications, and consumer applications.
The MAX4091ASA+T belongs to Maxim's precision rail-to-rail op amp family, designed specifically for low-voltage, micropower signal conditioning in battery-operated and space-constrained systems where DC accuracy and wide dynamic range are critical.
FAQ
What is the maximum capacitive load the MAX4091ASA+T can drive without oscillation?
The MAX4091ASA+T is unity-gain stable driving ≥2000pF capacitive loads under typical conditions (e.g., RL ≥100kΩ), as confirmed in the datasheet's "Capacitive-Load Stability" specification. This eliminates the need for output isolation resistors in most ADC driver and filter applications - unlike many competing rail-to-rail op amps that require external compensation above 100pF.
Does the MAX4091ASA+T support true rail-to-rail input operation beyond the supply rails?
Yes - the MAX4091ASA+T features Beyond-the-Rails™ inputs, allowing common-mode voltage from (VEE − 0.05V) to (VCC + 0.05V). This means it accepts input signals 50mV below ground or 50mV above VCC in single-supply mode, with guaranteed no phase reversal - a critical capability for interfacing with sensors exhibiting overvoltage transients or mismatched reference levels.
What is the typical supply current of the MAX4091ASA+T at 3.3V operation?
At VCC = 3.3V and TA = +25°C, the MAX4091ASA+T draws 130µA typical supply current (ICC), with a maximum of 165µA across temperature and process variation. This ultra-low quiescent current enables multi-year operation from primary lithium coin cells in always-on sensor nodes, as verified in the "Supply Current" section of the Electrical Characteristics table.
Can the MAX4091ASA+T operate from split supplies?
Yes - the MAX4091ASA+T supports dual-supply operation from ±1.35V to ±3V, in addition to single-supply mode from 2.7V to 6V. Its input common-mode range extends across both rails, and output swing remains rail-to-rail regardless of supply configuration - making it suitable for legacy industrial systems using ±2.5V or ±3V rails without redesigning bias networks.
What package variants are available for the MAX4091, and which one is the MAX4091ASA+T?
The MAX4091 is offered in 5-pin SOT23 (MAX4091AUK-T), 8-pin µMAX (MAX4091AUA), and 8-pin SO (MAX4091ASA). The MAX4091ASA+T is the tape-and-reel version of the 8-pin SO package - identical electrically and mechanically to MAX4091ASA, with "+T" denoting reel packaging for automated assembly. All share the same pinout, specs, and temperature rating (−40°C to +125°C).
MAX4091ASA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Beyond-the-Rails™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-SOIC
MAX4091ASA+T FAQ
1.How can I place an order for MAX4091ASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4091ASA+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 MAX4091ASA+T reliable?
The price and inventory of MAX4091ASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4091ASA+T is usually 5 days.
3.What payment methods are accepted for MAX4091ASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4091ASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4091ASA+T?
MAX4091ASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4091ASA+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 MAX4091ASA+T?
For technical support, including MAX4091ASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4091ASA+T requirements.
6.How does Aetrix verify that MAX4091ASA+T is sourced from the original manufacturer or authorized distributors?
All MAX4091ASA+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 MAX4091ASA+T meets industry standards.
7.What is the process for return or replacement of MAX4091ASA+T?
All MAX4091ASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4091ASA+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 MAX4091ASA+T part is unused and in its original packaging.
Return procedure for MAX4091ASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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