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Analog Devices Inc./Maxim Integrated MAX4474EUA+
- Part No.:
- MAX4474EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4474EUA+.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,350
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Product details
Overview
The MAX4474EUA+ from Maxim Integrated is a dual micropower rail-to-rail operational amplifier optimized for ultra-low-power, single-supply systems. It operates from +1.8V to +5.5V, draws only 750nA per amplifier, delivers 40kHz gain-bandwidth, and supports minimum closed-loop gain of +5V/V - making it ideal for battery-powered pH meters and remote sensor badges.
For engineers reviewing the MAX4474EUA+ datasheet, MAX4474EUA+ pinout, MAX4474EUA+ application, or MAX4474EUA+ equivalent, this page provides verified electrical specifications, µMAX® package terminal mapping, dual-channel ground-sensing op amp use cases, and validated alternative parts for low-voltage, high-impedance signal conditioning.
Technical Context
The MAX4474EUA+ implements a BiCMOS input stage enabling ground-sensing input common-mode range (VSS to VDD − 1.1V) and rail-to-rail output swing within 4mV of supply rails under 100kΩ load. Its decompensated architecture ensures stability only at closed-loop gains ≥+5V/V, distinguishing it from unity-gain-stable variants like MAX4471.
Each amplifier channel sources/sinks ±11mA with +5V supply, exhibits 120dB open-loop voltage gain, and maintains 80° phase margin at 40kHz GBW. Input offset voltage is ±0.5mV (typ), with 8µV/°C drift, supporting precision DC-coupled sensing in thermally variable environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.8V to +5.5V - enables direct operation from single Li+ or two-cell alkaline batteries without regulation. |
| Supply Current per Amplifier | 0.75µA (typ) - extends battery life beyond 10 years in always-on remote sensor nodes drawing <1µA average. |
| Gain-Bandwidth Product | 40kHz - supports stable amplification of low-frequency biosignals (e.g., ECG, pH electrode outputs) up to ~3kHz. |
| Input Offset Voltage | ±0.5mV (typ) - minimizes DC error in high-gain transducer interfaces, reducing calibration burden in portable instrumentation. |
| Output Drive Capability | ±11mA (sourcing/sinking at +5V) - directly drives 10kΩ loads or ADC reference buffers without external gain stages. |
| Common-Mode Input Range | VSS to (VDD − 1.1V) - allows direct connection to grounded sensors (e.g., thermistors, pH electrodes) without level-shifting. |
| Capacitive Load Drive | 250pF (min) - tolerates PCB trace capacitance and ADC input capacitance without oscillation in compact layouts. |
Pinout & Package
MAX4474EUA+ is housed in an 8-pin µMAX® package (package code U8+1), measuring 3.0mm × 3.0mm × 1.1mm with exposed paddle for thermal enhancement. Pin 1 is marked by a dot; device orientation follows standard SOIC-like top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - rail-to-rail swing (within 4mV of VDD/VSS) drives high-impedance loads or ADC inputs directly. |
| 2 | INA− | Inverting input (Channel A) - high-impedance node (±200pA bias current) for precision feedback networks. |
| 3 | INA+ | Noninverting input (Channel A) - accepts ground-referenced sensor signals without level shift due to VSS-sensing capability. |
| 4 | VSS | Negative supply - connects to system ground; serves as reference for both inputs and output swing. |
| 5 | VDD | Positive supply - accepts +1.8V to +5.5V; requires local 0.1µF ceramic bypass capacitor. |
| 6 | INB+ | Noninverting input (Channel B) - independent second channel for differential front-end or dual-sensor monitoring. |
| 7 | INB− | Inverting input (Channel B) - matched to INA− for consistent DC performance across both amplifiers. |
| 8 | OUTB | Amplifier B output - identical rail-to-rail drive capability as OUTA; enables dual-path signal conditioning on one die. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal on overdriven inputs | Prevents catastrophic output latch-up when sensor transients exceed common-mode range - critical for unattended field sensors. |
| Rail-to-rail output swing | Delivers full dynamic range into ADCs or comparators: VOH ≤ VDD − 4mV and VOL ≥ VSS + 4mV @ 100kΩ load. |
| Ground-sensing input range | Accepts input voltages down to VSS (0V), eliminating need for negative supply or level-shifting circuitry in single-supply systems. |
| Ultra-low 750nA supply current | Reduces quiescent power to 3.75nW per amplifier at +5V - enables multi-year operation on coin-cell batteries. |
| Stable at gain ≥+5V/V | Enables high-precision, low-noise noninverting configurations (e.g., G = 5, 10, 100) without external compensation components. |
Applications
| pH Meter Front-End | Remote Environmental Sensor Node |
|---|---|
Use Scenario: Amplifying high-impedance mV-level output from glass pH electrodes in portable handheld testers. IC Role / Device Role / Timing Role: Dual-channel precision DC amplifier: Channel A buffers electrode signal; Channel B conditions temperature-compensation thermistor. Use Value: Ground-sensing inputs accept electrode's 0–500mV output referenced to solution ground; rail-to-rail output maximizes ADC utilization without level-shifting. |
Use Scenario: Signal conditioning for battery-powered soil moisture and ambient temperature sensors deployed in agriculture IoT gateways. IC Role / Device Role / Timing Role: Dual op amp providing low-power transducer excitation (constant-current source via feedback) and buffered analog output for wireless MCU ADC. Use Value: 750nA quiescent current extends 10-year battery life; 40kHz GBW supports fast step response during moisture probe actuation. |
| Portable Medical Diagnostic Device | Low-Power Thermostat Controller |
Use Scenario: Amplifying weak bio-potential signals (e.g., skin conductance, pulse oximetry LED photodiode current) in handheld health monitors. IC Role / Device Role / Timing Role: Dual-channel transimpedance amplifier (TIA) and buffer: Channel A converts photodiode current to voltage; Channel B filters and scales output. Use Value: 120dB open-loop gain ensures <0.1% gain error at G=100; 250pF capacitive load tolerance accommodates long sensor cables. |
Use Scenario: Precision temperature measurement using NTC thermistors in battery-operated smart home thermostats. IC Role / Device Role / Timing Role: Dual op amp implementing ratiometric thermistor bridge excitation and differential amplification against reference voltage. Use Value: ±0.5mV input offset minimizes temperature error (<0.1°C at 25°C); ground-sensing inputs simplify bridge interface without floating supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4471EKA+T | Unity-gain stable; 9kHz GBW; same 750nA supply current and ground-sensing inputs. | Supports G = 1 configurations (e.g., voltage followers) but lacks bandwidth for higher-speed sensor signals. | Select MAX4471EKA+T when unity-gain stability is required and signal bandwidth <5kHz suffices. |
| TLV2462IDR | 2.5µA supply current; 6.4MHz GBW; rail-to-rail I/O; wider supply range (+2.7V to +6V). | Higher power consumption trades off for 160× greater bandwidth - unsuitable for multi-year battery life. | Choose TLV2462IDR only if >10kHz signal fidelity is mandatory and battery replacement is acceptable. |
Compared with MAX4471EKA+T, the MAX4474EUA+ offers 4.4× higher bandwidth at identical quiescent current but requires minimum gain ≥5V/V; versus TLV2462IDR, it reduces supply current by 3.3× while sacrificing bandwidth - making it optimal for ultra-low-power, sub-10kHz sensor front-ends.
Availability
MAX4474EUA+ is available at Aetrix Electronics and suitable for pH meters, remote environmental sensor nodes, portable medical diagnostic devices, and low-power thermostat controllers requiring stable component supply with guaranteed long-term availability.
Supply support for MAX4474EUA+ 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 and mixed-signal ICs for demanding industrial, medical, and battery-powered applications.
The MAX4474EUA+ belongs to Maxim's micropower op amp family engineered specifically for energy-constrained, single-supply systems where ground-referenced sensing and nanowatt operation are essential.
FAQ
What is the minimum stable gain configuration for the MAX4474EUA+?
The MAX4474EUA+ is decompensated and stable only for closed-loop gain configurations of +5V/V or greater. Attempting unity-gain or G = 2 configurations may cause oscillation. This differs from unity-gain-stable variants like MAX4471. Always verify stability with actual load and layout using the manufacturer's recommended compensation guidelines for the MAX4474EUA+.
Does the MAX4474EUA+ support true ground-sensing input operation?
Yes, the MAX4474EUA+ guarantees input common-mode voltage range from VSS (0V) to (VDD − 1.1V), enabling direct interfacing with grounded sensors such as pH electrodes, thermistors, or strain gauges without level-shifting circuitry. This is confirmed in the Electrical Characteristics table under "Input Common-Mode Voltage Range" for the MAX4474EUA+.
What package type and dimensions does the MAX4474EUA+ use?
The MAX4474EUA+ uses the 8-pin µMAX® package (package code U8+1), with body dimensions of 3.0mm × 3.0mm × 1.1mm and a standard SOIC-compatible footprint. Pin 1 is marked by a dot; thermal performance is enhanced by the exposed paddle, which must be soldered to a thermal pad on the PCB for optimal reliability.
Can the MAX4474EUA+ drive capacitive loads commonly found in ADC inputs?
Yes, the MAX4474EUA+ is specified to drive ≥250pF capacitive loads without sustained oscillation, as stated in the Electrical Characteristics table. This makes it suitable for direct connection to SAR and delta-sigma ADC inputs (typically 10–50pF) plus PCB trace capacitance, though layout best practices (short traces, local bypassing) remain essential for stability.
How does the supply current of the MAX4474EUA+ vary with temperature and supply voltage?
The MAX4474EUA+ maintains ultra-low supply current: 0.75µA (typ) at +25°C and +5V, rising to ≤1.5µA across −40°C to +85°C operating range. Supply current remains stable from +1.8V to +5.5V, as shown in Figure MAX4470–74 toc01 and toc02 - confirming suitability for wide-input-voltage battery systems where voltage declines over discharge.
MAX4474EUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.02V/µs
- Gain Bandwidth Product:
- 40 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 200 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 750nA (x2 Channels)
- Current - Output / Channel:
- 36 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4474EUA+ FAQ
1.How can I place an order for MAX4474EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4474EUA+ 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 MAX4474EUA+ reliable?
The price and inventory of MAX4474EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4474EUA+ is usually 5 days.
3.What payment methods are accepted for MAX4474EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4474EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4474EUA+?
MAX4474EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4474EUA+ 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 MAX4474EUA+?
For technical support, including MAX4474EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4474EUA+ requirements.
6.How does Aetrix verify that MAX4474EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4474EUA+ 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 MAX4474EUA+ meets industry standards.
7.What is the process for return or replacement of MAX4474EUA+?
All MAX4474EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4474EUA+, 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 MAX4474EUA+ part is unused and in its original packaging.
Return procedure for MAX4474EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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