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Analog Devices Inc./Maxim Integrated MAX4037EUT-T
- Part No.:
- MAX4037EUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
MAX4037EUT-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:2,963
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Product details
Overview
MAX4037EUT-T from Maxim Integrated is a single-channel, rail-to-rail output operational amplifier with integrated 1.232V ±0.5% buffered voltage reference, operating from +1.8V to +3.6V supply, consuming only 3.2µA total (800nA per amplifier + 1.1µA reference), featuring 200µV typical input offset voltage and 1.0pA typical input bias current. It is designed for precision low-power sensor signal conditioning in battery-powered medical and portable instrumentation.
For engineers reviewing the MAX4037EUT-T datasheet, MAX4037EUT-T pinout, MAX4037EUT-T application, or MAX4037EUT-T equivalent, this page delivers verified specifications, SOT23-6 package layout, reference stability data, micropower design trade-offs, and direct alternative comparisons for potentiostat, pH meter, and battery-monitoring circuits.
Technical Context
The MAX4037EUT-T integrates a precision op amp and a buffered bandgap reference on a single BiCMOS die, enabling self-referenced analog front-ends without external components. Its rail-to-rail output drives 5kΩ loads to within 25mV of rails at VDD = 3V, while maintaining unity-gain stability up to 5000pF capacitive load.
The 1.232V reference exhibits ±120ppm/°C max temperature coefficient, 0.3%/V line regulation, and 0.0075%/µA load regulation (sinking), supporting accurate ratiometric measurements in varying supply and load conditions across -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.8V to +3.6V - Enables direct operation from single Li+ or two-cell alkaline batteries without regulation. |
| Total Supply Current | 3.2µA (typ) at VDD = 3.6V - Ultra-low power enables >10-year battery life in always-on sensor nodes. |
| Input Offset Voltage | ±200µV (typ) - Supports sub-mV-level DC accuracy in pH and thermistor amplification. |
| Input Bias Current | 1.0pA (typ) - Critical for high-impedance electrode interfaces (e.g., glass pH electrodes, electrometers). |
| Reference Voltage | 1.232V ±0.5% - Stable, buffered reference eliminates need for external bypass capacitor in ratiometric ADC designs. |
| Output Swing (5kΩ) | VSS + 25mV to VDD – 25mV - Full dynamic range utilization with 12-bit+ ADCs powered from same rail. |
| Capacitive Load Stability | 5000pF - Drives long traces or ADC input capacitance without external isolation resistor. |
Pinout & Package
SOT23-6 package (6-pin, 2.9mm × 2.9mm × 1.15mm), RoHS-compliant, top mark ABRX. Exposed pad not present in SOT23 variant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | INA+ | Noninverting input - High-impedance node for sensor connection; 1.0pA bias current minimizes leakage error. |
| 2 | VSS | Negative supply - Must be connected to system ground; serves as reference return for both op amp and reference. |
| 3 | INA− | Inverting input - Used for feedback or differential sensing; matched input impedance critical for CMRR. |
| 4 | OUT | Amplifier output - Rail-to-rail swing supports full-scale ADC utilization; capable of sourcing/sinking ±13mA. |
| 5 | VDD | Positive supply - Accepts decaying battery voltage directly; PSRR >82dB maintains reference and gain stability. |
| 6 | REF | 1.232V buffered reference output - Supplies stable excitation for bridge sensors or ADC reference; no external cap required. |
Key Features
| Feature | Design Value |
|---|---|
| No external reference bypass capacitor | Reduces BOM count and PCB area; eliminates capacitor aging drift and ESR-related instability in portable devices. |
| Rail-to-rail output driving 5kΩ | Enables direct interface to SAR ADCs with 1MΩ input impedance without gain loss or headroom compromise. |
| 1.232V ±0.5%, 120ppm/°C reference | Supports <±0.1% total system accuracy over temperature in battery voltage monitoring and potentiostat control loops. |
| No phase reversal on overdriven inputs | Prevents latch-up or erroneous output states during transient sensor faults or power-up sequencing. |
| Unity-gain stable up to 5000pF | Eliminates need for output series resistor in PCB layouts with long traces or high-C ADC inputs. |
Applications
| Three-Electrode Potentiostat | pH Meter Front-End |
|---|---|
|
Use Scenario: Electrochemical measurement using working, counter, and reference electrodes in lab-grade or handheld analyzers. IC Role / Device Role / Timing Role: Precision transimpedance amplifier and stable reference source for biasing the reference electrode. Use Value: 1.0pA input bias current prevents polarization error on high-impedance glass electrodes; 1.232V reference enables ratiometric calibration against ADC reference. |
Use Scenario: Portable or benchtop pH probe signal conditioning with automatic temperature compensation. IC Role / Device Role / Timing Role: Low-drift buffer for high-impedance pH electrode output and stable reference for ADC conversion. Use Value: ±200µV offset ensures <0.01pH resolution; rail-to-rail output maximizes dynamic range when paired with 3.3V ADCs. |
| Battery Voltage Monitor | Remote Sensor Amplifier |
|
Use Scenario: Accurate state-of-charge estimation in coin-cell or Li+ powered IoT endpoints. IC Role / Device Role / Timing Role: Comparator with hysteresis using internal reference to detect low-battery thresholds. Use Value: 0.3%/V line regulation allows direct connection to decaying battery rail; 3.2µA total current extends battery life beyond 5 years. |
Use Scenario: Signal amplification for distributed environmental sensors (CO₂, humidity, gas) in energy-harvesting nodes. IC Role / Device Role / Timing Role: Micropower sensor interface amplifier with integrated reference for ratiometric scaling. Use Value: 1.8V minimum supply enables operation under weak solar or thermal harvesters; REF pin provides stable excitation for resistive sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower op amp with reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4039ETB-T | Dual-channel version in 10-pin TDFN; shares identical reference specs and op amp performance per channel. | Requires PCB redesign for dual-sensor or differential pair use; higher channel density but larger footprint. | Select when needing two independent low-power amplifiers with shared reference in space-constrained designs. |
| LTC1540CS5#TRMPBF | Single op amp + reference, but reference is 1.182V (not 1.232V); higher 1.2µA supply current; SC70-5 package. | Lacks REF pin drive capability (20µA sink only vs. MAX4037's 20µA sink / 100µA source); less suitable for active sensor biasing. | Choose only if 1.182V reference aligns with existing ADC reference scheme and lower sourcing current is acceptable. |
Compared with MAX4039ETB-T and LTC1540CS5#TRMPBF, the MAX4037EUT-T uniquely combines single-channel simplicity, SOT23-6 compactness, 100µA reference sourcing, and optimal 1.232V value for common ratiometric ADC architectures - making it the most direct fit for space- and power-constrained single-sensor systems.
Availability
MAX4037EUT-T is available at Aetrix Electronics and suitable for battery-powered medical instrumentation, portable pH meters, micropower thermostats, and remote sensor amplifiers requiring stable component supply across extended production lifecycles.
Supply support for MAX4037EUT-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, mixed-signal, and power management ICs for industrial, medical, and communications markets.
The MAX4036–MAX4039 family was engineered specifically for ultra-low-power, single-supply sensor signal chains where micropower operation, rail-to-rail I/O, and integrated precision reference eliminate discrete support components.
FAQ
What is the minimum supply voltage required for reliable operation of the MAX4037EUT-T?
The MAX4037EUT-T requires a minimum supply voltage of +1.8V for guaranteed operation, as confirmed by PSRR and line regulation testing in the datasheet. Operation below 1.8V may result in degraded reference accuracy, reduced output swing, or failure to meet specified offset and bias current limits. The +1.4V rating applies only to the MAX4036/MAX4038 variants without reference.
Can the REF pin of the MAX4037EUT-T be used to source current to external circuitry?
Yes, the REF pin of the MAX4037EUT-T can source up to 100µA while maintaining ±0.5% accuracy, as specified in the Electrical Characteristics table. This capability enables direct biasing of resistive sensors or reference inputs of ADCs without additional regulators or buffers - a key advantage over alternatives like the LTC1540.
Does the MAX4037EUT-T require an external bypass capacitor on the REF pin?
No, the MAX4037EUT-T does not require an external bypass capacitor on the REF pin. The integrated reference is internally buffered and stabilized, and the datasheet explicitly states "No External Reference Bypass Capacitor Required" under Features. Adding one offers no benefit and may degrade transient response.
What is the maximum capacitive load the MAX4037EUT-T output can drive while remaining stable?
The MAX4037EUT-T output is unity-gain stable driving up to 5000pF capacitive load, as verified in the Capacitive-Load Stability specification and Typical Operating Characteristics (Figure toc17). This eliminates the need for isolation resistors in most PCB layouts, including those with long traces or high-input-capacitance ADCs.
How does the input bias current of the MAX4037EUT-T impact high-impedance sensor measurements?
The MAX4037EUT-T features 1.0pA typical input bias current, which introduces <1mV error when interfacing with 1GΩ sources (e.g., pH electrodes). This ultra-low value is essential for preserving signal integrity in electrometer-grade applications - significantly outperforming standard rail-to-rail op amps with bias currents >100pA.
MAX4037EUT-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:
- 0.004V/µs
- Gain Bandwidth Product:
- 4 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 2µA
- Current - Output / Channel:
- 13 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 3.6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX4037EUT-T FAQ
1.How can I place an order for MAX4037EUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4037EUT-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 MAX4037EUT-T reliable?
The price and inventory of MAX4037EUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4037EUT-T is usually 5 days.
3.What payment methods are accepted for MAX4037EUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4037EUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4037EUT-T?
MAX4037EUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4037EUT-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 MAX4037EUT-T?
For technical support, including MAX4037EUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4037EUT-T requirements.
6.How does Aetrix verify that MAX4037EUT-T is sourced from the original manufacturer or authorized distributors?
All MAX4037EUT-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 MAX4037EUT-T meets industry standards.
7.What is the process for return or replacement of MAX4037EUT-T?
All MAX4037EUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4037EUT-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 MAX4037EUT-T part is unused and in its original packaging.
Return procedure for MAX4037EUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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