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Analog Devices Inc./Maxim Integrated MAX4039EUB+T
- Part No.:
- MAX4039EUB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4039EUB+T.pdf
- Description:
- IC OPAMP GP 2 CIRC 10UMAX/USOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,505
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Product details
Overview
MAX4039EUB+T from Maxim Integrated is a dual, rail-to-rail output operational amplifier with integrated 1.232V buffered voltage reference, operating from +1.8V to +3.6V supply and consuming only 5.3µA total supply current (typ) at +3.6V. It features ultra-low input bias current (±100pA max over temperature), 25mV rail-to-rail output swing into 5kΩ, and ±8mV input offset voltage. It is designed for precision low-power sensor signal conditioning in battery-powered potentiostats and pH meters.
For engineers reviewing the MAX4039EUB+T datasheet, MAX4039EUB+T pinout, MAX4039EUB+T application, or MAX4039EUB+T equivalent, this page delivers verified electrical parameters, package-specific terminal mapping, real-world use-value analysis for electrochemical sensing, and validated alternative options for dual-channel micropower op-amp + reference integration.
Technical Context
The MAX4039EUB+T integrates two independent op amps and a buffered 1.232V reference on a single BiCMOS die. Its rail-to-rail output stage drives 5kΩ loads to within 25mV of VDD/VSS while maintaining unity-gain stability up to 5000pF capacitive load - no external compensation required. Input common-mode range extends to VSS and up to VDD − 0.4V at 1.8V supply.
Reference performance is specified across temperature: ±120ppm/°C max TCVREF (for EUB variant), 0.6%/V line regulation, and 0.015%/µA load regulation (sinking). The reference requires no bypass capacitor and supports sourcing up to 100µA and sinking up to 20µA - enabling direct interface with ADC references or transducer bias networks.
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/NiMH batteries without regulation. |
| Total Supply Current | 5.3µA (typ) at +3.6V - allows >10-year battery life in always-on sensor nodes powered by CR2032. |
| Input Bias Current | ±100pA (max, full temp range) - preserves high-impedance electrode signals in potentiostat and pH meter front-ends. |
| Rail-to-Rail Output Swing | 25mV from rails into 5kΩ - maximizes dynamic range for 12-bit+ ADCs operating at low supply voltages. |
| Reference Voltage | 1.232V ±0.5% (1.226V–1.238V) - provides stable, low-drift excitation for ratiometric measurements and ADC reference scaling. |
| Gain-Bandwidth Product | 4kHz - sufficient for DC-coupled sensor amplification and slow-response electrochemical control loops. |
| Input Offset Voltage | ±8mV (max, -40°C to +85°C) - supports accurate baseline correction in microamp-level current measurement circuits. |
Pinout & Package
The MAX4039EUB+T is housed in a 10-pin µMAX package (3mm × 3mm, 0.8mm height), RoHS-compliant, with exposed paddle connected to VSS. Pin 1 is marked by a dot; top-side marking is blank per ordering table.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - rail-to-rail capable; connects directly to ADC input or feedback network in potentiostat loop. |
| 2 | INA− | Inverting input of Amplifier A - high-impedance node for current-to-voltage conversion in three-electrode cells. |
| 3 | INA+ | Noninverting input of Amplifier A - used for reference biasing or sensor excitation in differential configurations. |
| 4 | N.C. | No connection - not internally bonded; must be left floating or tied to VSS per layout guidelines. |
| 5 | OUTB | Amplifier B output - independent channel for auxiliary functions (e.g., battery voltage monitoring or REF buffer). |
| 6 | INB− | Inverting input of Amplifier B - supports dual-sensor readout or active filtering of reference noise. |
| 7 | INB+ | Noninverting input of Amplifier B - can accept VREF for comparator hysteresis or bias generation. |
| 8 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor to VSS near pin for low-noise operation. |
| 9 | VSS | Negative supply - connect exposed paddle (EP) to this pin for thermal and noise performance. |
| 10 | REF | Buffered 1.232V reference output - drives ADC reference inputs or transducer excitation without external buffering. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 5.3µA total supply current | Enables multi-year operation from coin-cell batteries in portable medical and environmental sensors. |
| Rail-to-rail outputs driving 5kΩ | Preserves full ADC input range at 1.8V supply, eliminating level-shifting circuitry in low-voltage systems. |
| Integrated 1.232V ±0.5% reference | Provides stable, low-drift excitation for ratiometric pH or ion-selective electrode measurements without external components. |
| No external reference bypass capacitor required | Reduces BOM count and PCB area in space-constrained wearable and implantable devices. |
| Unity-gain stable up to 5000pF load | Supports direct connection to long traces or capacitive sensors (e.g., humidity or touch electrodes) without isolation resistors. |
| No phase reversal on overdriven inputs | Prevents latch-up or erroneous output states during transient electrode polarization in potentiostatic applications. |
Applications
| Three-Electrode Potentiostat | pH Meter Front-End |
|---|---|
|
Use Scenario: Electrochemical current measurement using working, counter, and reference electrodes in corrosion monitoring or biosensors. IC Role / Device Role / Timing Role: MAX4039EUB+T configures as transimpedance amplifier (Channel A) and reference buffer (Channel B + REF), enabling precise current-to-voltage conversion and stable biasing. Use Value: ±100pA input bias current minimizes error in pA-level currents; 1.232V REF sets accurate counter-electrode potential; rail-to-rail swing ensures full-scale ADC utilization at 1.8V. |
Use Scenario: High-impedance glass electrode signal conditioning in handheld or portable pH meters. IC Role / Device Role / Timing Role: Channel A acts as ultra-high-Z buffer for electrode output; REF supplies stable reference for ADC; Channel B monitors battery voltage or temperature. Use Value: <100pA IB guarantees minimal loading of MΩ–GΩ electrode impedance; 25mV output swing preserves resolution at low supply; integrated REF eliminates external voltage reference IC and its associated noise. |
| Micropower Thermostat Sensor Interface | Remote Electrochemical Gas Sensor |
|
Use Scenario: Battery-powered HVAC thermostat measuring RTD or thermistor resistance via constant-current excitation. IC Role / Device Role / Timing Role: Channel A implements precision current source (using REF and op amp); Channel B buffers REF for ADC reference; both operate continuously at sub-µA quiescent current. Use Value: 5.3µA total IDD enables >5-year CR2032 life; 1.232V REF provides stable excitation current (I = VREF/Rset); rail-to-rail output ensures full DAC/ADC compatibility down to 1.8V. |
Use Scenario: Wireless gas detection node using amperometric electrochemical cell requiring stable bias and low-noise signal amplification. IC Role / Device Role / Timing Role: REF biases working electrode; Channel A conditions cell current output; Channel B monitors cell voltage or temperature compensation network. Use Value: ±120ppm/°C TCVREF ensures <0.1% drift over −20°C to +60°C ambient; no external REF cap reduces failure points; low 4kHz GBW suppresses RF interference while passing DC–10Hz gas response signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower op-amp + reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2050CMS8#PBF | Dual zero-drift op amp (no integrated reference); 1.5µA per amp; 0.5µV/°C offset drift; requires external REF. | Superior DC precision for low-frequency (<1Hz) measurements but lacks integrated REF - adds BOM cost and board area. | Select when ultra-low offset drift dominates over integration and power; avoid if REF integration simplifies design or saves space. |
| AD8603ARZ-REEL7 | Single micropower op amp (600nA); no reference; rail-to-rail I/O; 1.8V–5.5V supply; 50µV max VOS. | Lower power per channel but requires separate REF IC (e.g., ADR3412) and second op amp - increases component count and layout complexity. | Select for single-channel, ultra-low-VOS needs where REF is already available; not suitable as drop-in replacement for dual + REF function. |
Compared with LTC2050CMS8#PBF and AD8603ARZ-REEL7, the MAX4039EUB+T uniquely combines dual amplifiers and a buffered 1.232V reference in one 10-pin µMAX package at 5.3µA total IDD - delivering system-level integration, reduced layout risk, and guaranteed reference-op amp tracking that discrete solutions cannot match.
Availability
MAX4039EUB+T is available at Aetrix Electronics and suitable for portable medical instrumentation, electrochemical sensor modules, and micropower thermostats requiring stable component supply across extended product lifecycles.
Supply support for MAX4039EUB+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, medical, and communications applications.
The MAX4036–MAX4039 family targets ultra-low-power electrochemical and sensor signal chains, integrating rail-to-rail op amps and buffered references to eliminate external components in battery-operated analytical instruments.
FAQ
What is the maximum load current the MAX4039EUB+T reference can source or sink?
The MAX4039EUB+T reference can source up to 100µA and sink up to 20µA while maintaining ±0.5% accuracy. This capability allows direct driving of ADC reference inputs (e.g., SAR or delta-sigma converters requiring ≤50µA REF current) or biasing of low-current transducers without external buffers - a key advantage confirmed in the Electrical Characteristics table under "REFERENCE" section.
Does the MAX4039EUB+T require an external bypass capacitor on the REF pin?
No, the MAX4039EUB+T reference requires no external bypass capacitor - explicitly stated in the Features list and Applications Information section. This eliminates a common failure point and reduces PCB area, making it ideal for compact, high-reliability designs like handheld pH meters and wearable biosensors where the MAX4039EUB+T serves as both signal conditioner and reference source.
What is the input common-mode voltage range of the MAX4039EUB+T at 1.8V supply?
At VDD = +1.8V, the MAX4039EUB+T input common-mode voltage range is VSS to VDD − 0.4V (i.e., 0V to +1.4V), as guaranteed by CMRR testing per the Electrical Characteristics table. This range supports operation with ground-referenced sensors while maintaining >50dB CMRR - critical for rejecting noise in three-electrode potentiostat configurations where the MAX4039EUB+T is commonly deployed.
Can the MAX4039EUB+T be used as a comparator?
Yes, the MAX4039EUB+T can be used as a rail-to-rail I/O comparator, as documented in the Applications Information section. Its low input bias current and rail-to-rail output make it suitable for battery-monitoring circuits with hysteresis (e.g., Figure 4), though external positive feedback is recommended to prevent oscillation. The MAX4039EUB+T's 4kHz GBW limits use to low-speed threshold detection - not high-frequency signal comparison.
What is the temperature coefficient of the reference voltage in the MAX4039EUB+T?
The MAX4039EUB+T has a reference voltage temperature coefficient (TCVREF) of ±120ppm/°C maximum, as specified for the EUB package variant in the Electrical Characteristics table (Note: MAX4039EBL-T is ±200ppm/°C). This tight spec ensures <0.1% reference drift over −40°C to +85°C, supporting high-accuracy ratiometric measurements in field-deployed pH and gas sensors where the MAX4039EUB+T provides both signal gain and stable excitation.
MAX4039EUB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- 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:
- 3µA
- 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:
- 10-uMAX/uSOP
MAX4039EUB+T FAQ
1.How can I place an order for MAX4039EUB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4039EUB+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 MAX4039EUB+T reliable?
The price and inventory of MAX4039EUB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4039EUB+T is usually 5 days.
3.What payment methods are accepted for MAX4039EUB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4039EUB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4039EUB+T?
MAX4039EUB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4039EUB+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 MAX4039EUB+T?
For technical support, including MAX4039EUB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4039EUB+T requirements.
6.How does Aetrix verify that MAX4039EUB+T is sourced from the original manufacturer or authorized distributors?
All MAX4039EUB+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 MAX4039EUB+T meets industry standards.
7.What is the process for return or replacement of MAX4039EUB+T?
All MAX4039EUB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4039EUB+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 MAX4039EUB+T part is unused and in its original packaging.
Return procedure for MAX4039EUB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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