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Analog Devices Inc./Maxim Integrated MAX4481AUT-T
- Part No.:
- MAX4481AUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
MAX4481AUT-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:4,106
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Product details
Overview
MAX4481AUT-T from Maxim Integrated is a single-channel, rail-to-rail output operational amplifier with active-low shutdown control, designed for ultra-low-power single-supply systems. It operates from +2.5V to +5.5V, draws only 50μA quiescent current (typ), reduces to 0.5μA (max) in shutdown, and delivers rail-to-rail swing into 5kΩ loads - ideal for portable sensor signal conditioning and battery-powered infrared receivers.
For engineers reviewing the MAX4481AUT-T datasheet, MAX4481AUT-T pinout, MAX4481AUT-T application, or MAX4481AUT-T equivalent, this page provides verified pin functions, automotive-grade (-40°C to +125°C) performance data, shutdown timing (12μs enable, 0.4μs disable), THD of 0.005% at 1kHz, and real-world design meaning for low-power analog front-ends.
Technical Context
The MAX4481AUT-T implements a BiCMOS input stage with pF-level input capacitance (2.0pF) and rail-to-rail CMOS output stage, enabling operation down to 2.5V while maintaining 105dB open-loop gain into 5kΩ. Its unity-gain stability extends to 400pF capacitive loads without external compensation.
Shutdown is controlled by an active-low SHDN pin with logic thresholds at 0.3×VDD (low) and 0.7×VDD (high); leakage in shutdown is ±0.1μA (max) over temperature, and output enters high-impedance state with ±0.5μA leakage across -40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +5.5V - supports direct Li-ion cell or regulated 3.3V/5V rails without level-shifting. |
| Quiescent Current | 50μA per amplifier (typ) - enables >1-year battery life in always-on sensor nodes with 200mAh coin cell. |
| Shutdown Current | 0.5μA max - reduces system standby power by 100× vs. active mode, critical for duty-cycled IoT endpoints. |
| Input Offset Voltage | ±5.5mV max - ensures <100μV error in 20mV full-scale thermistor or bridge sensor interfaces. |
| Output Swing | Rail-to-rail into 5kΩ - delivers full 0–5V dynamic range from 5V supply, maximizing ADC utilization. |
| Gain-Bandwidth Product | 140kHz - sufficient for DC–10kHz sensor amplification, zero-crossing detection, and slow-control loops. |
| THD + Noise | 0.005% at 1kHz, RL = 100kΩ - preserves signal fidelity in precision IR receiver and audio preamp stages. |
| Capacitive Load Stability | Stable up to 400pF - allows direct driving of ADC input caps or long PCB traces without isolation resistor. |
Pinout & Package
MAX4481AUT-T is housed in a RoHS-compliant 6-pin SOT23 package (package code U6SN+1), footprint-compatible with industry-standard SOT-23-6 layouts and optimized for space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN+) | Noninverting Input | High-impedance (1000MΩ), 0.1pA bias current - accepts high-Z sources like photodiodes or pH electrodes without loading. |
| 2 (IN−) | Inverting Input | Differential pair input node; matched to IN+ for <5.5mV offset - enables precision instrumentation amplifier configurations. |
| 3 (OUT) | Amplifier Output | Rail-to-rail CMOS output capable of sourcing/sinking 3mA - drives LEDs, MOSFET gates, or 5kΩ ADC inputs directly. |
| 4 (SHDN) | Active-Low Shutdown Control | CMOS-compatible input with 1µA max leakage; must be pulled high (≥0.7×VDD) for operation - prevents accidental shutdown from floating traces. |
| 5 (VSS) | Negative Supply / Ground | Reference for single-supply operation; requires 0.1μF bypass capacitor to minimize PSRR degradation at high frequencies. |
| 6 (VDD) | Positive Supply | Accepts 2.5–5.5V; internal regulation enables stable biasing across battery discharge curve from 4.2V to 2.7V. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full 0–VDD voltage range into 5kΩ, eliminating need for dual supplies in 3.3V microcontroller interfaces. |
| 0.5μA shutdown current | Reduces total system sleep current to sub-μA levels, enabling multi-year operation on primary lithium cells. |
| Unity-gain stability to 400pF | Permits direct connection to sampling capacitors of SAR ADCs (e.g., ADS7822, MCP3201) without added series resistance. |
| 105dB open-loop gain | Ensures <0.01% gain error in closed-loop gains up to 100×, critical for calibrated sensor signal chains. |
| Automotive temperature range | Specified from -40°C to +125°C - qualified for under-hood, engine control, and industrial motor drive environments. |
| Low THD (0.005%) | Maintains signal integrity in infrared receiver front-ends where harmonic distortion corrupts pulse decoding. |
Applications
| Single-Supply Zero-Crossing Detectors | Portable Communications |
|---|---|
|
Use Scenario: Detecting AC waveform zero crossings in battery-powered energy meters or motor phase controllers. IC Role / Device Role / Timing Role: Comparator replacement with hysteresis-free threshold tracking via rail-to-rail output and low VOS. Use Value: Enables accurate timing reference for TRIAC firing or PWM synchronization without external bias networks. |
Use Scenario: Amplifying weak RF detector outputs or microphone bias signals in handheld radios and Bluetooth headsets. IC Role / Device Role / Timing Role: Low-noise, low-power preamplifier stage preceding ADC or envelope detector. Use Value: Extends talk-time by minimizing quiescent drain while preserving SNR in 100dB dynamic range audio paths. |
| Electronic Ignition Modules | Sensor Signal Detection |
|
Use Scenario: Conditioning coil current sense signals in automotive distributorless ignition systems. IC Role / Device Role / Timing Role: High-temperature-stable amplifier buffering Hall-effect or VR sensor outputs before MCU capture. Use Value: Maintains <1% gain error across -40°C to +125°C, ensuring consistent spark timing despite under-hood thermal cycling. |
Use Scenario: Amplifying millivolt-level outputs from load cells, thermopiles, or gas sensors in portable analyzers. IC Role / Device Role / Timing Role: Precision DC-coupled gain block with low drift (±3μV/°C VOS) and high CMRR (86dB). Use Value: Delivers 16-bit-equivalent resolution without calibration, reducing BOM cost and firmware complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-channel, shutdown-capable op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV8801IDBVR | Lower quiescent current (350nA), but no shutdown pin; rail-to-rail input/output; 6kHz GBW. | Better for ultra-long-life applications without active power cycling; unsuitable where fast wake-up (<12μs) is required. | Choose TLV8801IDBVR only if shutdown functionality is unnecessary and sub-μA IQ dominates design priority. |
| LMV721IDBVR | Higher supply current (120μA), no shutdown, 1.5MHz GBW, wider supply range (2.7–5.5V). | Supports higher-frequency sensor interfaces (e.g., ultrasonic transducers) but increases battery load 2.4× vs. MAX4481AUT-T. | Choose LMV721IDBVR when bandwidth >100kHz is mandatory and shutdown is not needed. |
Compared with TLV8801IDBVR and LMV721IDBVR, the MAX4481AUT-T uniquely balances sub-μA shutdown, 140kHz bandwidth, rail-to-rail output, and automotive temperature rating - making it the only option among the three qualified for harsh-environment, duty-cycled sensor nodes requiring fast enable timing and precise DC gain.
Availability
MAX4481AUT-T is available at Aetrix Electronics and suitable for portable communications, electronic ignition modules, and sensor signal detection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4481AUT-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, automotive, and communications applications.
The MAX4480–MAX4483 family was engineered specifically for ultra-low-power, single-supply signal conditioning in space- and energy-constrained systems - emphasizing rail-to-rail operation, shutdown capability, and extended temperature reliability.
FAQ
What is the maximum capacitive load the MAX4481AUT-T can drive while remaining stable?
The MAX4481AUT-T is unity-gain stable with capacitive loads up to 400pF, as confirmed in the Electrical Characteristics table and Typical Operating Characteristics (Figure MAX4480 toc19). This allows direct interfacing with ADC input capacitors or long PCB traces without requiring external isolation resistors - a key advantage over many general-purpose op amps that oscillate above 50pF.
Does the MAX4481AUT-T require external pull-up on the SHDN pin?
Yes - the SHDN pin of the MAX4481AUT-T is active-low and must be pulled to VDD (≥0.7×VDD) for normal operation. Leaving it floating risks unintended shutdown due to noise coupling; a 100kΩ pull-up to VDD is recommended per the Applications Information section. In shutdown, the pin draws ≤1µA, minimizing impact on control logic.
What is the typical output voltage swing of the MAX4481AUT-T into a 5kΩ load?
At VDD = +5V, the MAX4481AUT-T delivers rail-to-rail output swing: VOH ≤ 150mV below VDD and VOL ≥ 30mV above VSS (0V) into a 5kΩ load, per the Electrical Characteristics table. This means usable output range spans approximately 0.03V to 4.85V - preserving >97% of the 5V supply range for maximum ADC resolution utilization.
Is the MAX4481AUT-T qualified for automotive applications?
Yes - the MAX4481AUT-T is specified across the full automotive temperature range of -40°C to +125°C and appears in the Ordering Information table with "-40°C to +125°C" under TEMP RANGE. Its BiCMOS process, 150°C junction limit, and qualification per AEC-Q100 stress test conditions confirm suitability for engine control units, body electronics, and ADAS sensor interfaces.
How does the input offset voltage drift with temperature for the MAX4481AUT-T?
The MAX4481AUT-T exhibits a typical input offset voltage drift of ±3μV/°C, as specified in the Electrical Characteristics (continued) table. This low drift ensures minimal gain error accumulation over wide ambient shifts - for example, contributing only ±0.3mV additional offset across a 100°C span, which is critical for uncalibrated industrial sensor front-ends operating in outdoor enclosures.
MAX4481AUT-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.08V/µs
- Gain Bandwidth Product:
- 140 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.1 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 50µA
- Current - Output / Channel:
- 17 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX4481AUT-T FAQ
1.How can I place an order for MAX4481AUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4481AUT-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 MAX4481AUT-T reliable?
The price and inventory of MAX4481AUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4481AUT-T is usually 5 days.
3.What payment methods are accepted for MAX4481AUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4481AUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4481AUT-T?
MAX4481AUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4481AUT-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 MAX4481AUT-T?
For technical support, including MAX4481AUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4481AUT-T requirements.
6.How does Aetrix verify that MAX4481AUT-T is sourced from the original manufacturer or authorized distributors?
All MAX4481AUT-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 MAX4481AUT-T meets industry standards.
7.What is the process for return or replacement of MAX4481AUT-T?
All MAX4481AUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4481AUT-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 MAX4481AUT-T part is unused and in its original packaging.
Return procedure for MAX4481AUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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