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Analog Devices Inc./Maxim Integrated MAX4038EUA+
- Part No.:
- MAX4038EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4038EUA+.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,810
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Product details
Overview
MAX4038EUA+ from Maxim Integrated is a dual, rail-to-rail output operational amplifier with no integrated reference, operating from +1.4V to +3.6V supply and consuming only 2.9–3.2µA total (1.45–1.6µA per amplifier) at VDD = 1.4V–3.6V. It features 800nA per amplifier supply current, 200µV typical input offset voltage, ±10pA max input bias current over temperature, and rail-to-rail output swing within 25mV of rails into 5kΩ - optimized for single-cell Li⁺ or two-cell alkaline/NiMH battery-powered precision sensing.
For engineers reviewing the MAX4038EUA+ datasheet, MAX4038EUA+ pinout, MAX4038EUA+ application, or MAX4038EUA+ equivalent, this page delivers verified electrical specs, µMAX package terminal mapping, dual-channel low-power op amp use cases in potentiostats and remote sensors, and validated alternative parts with documented functional and packaging differences.
Technical Context
The MAX4038EUA+ integrates two independent ultra-low-power op amps sharing a common supply and ground. Each amplifier supports rail-to-rail output swing into 5kΩ loads and operates down to +1.4V without external reference - unlike MAX4037/MAX4039 variants which embed a 1.232V buffered reference. Input common-mode range extends to VSS and up to VDD − 0.4V at 1.4V supply.
It uses BiCMOS process technology to achieve 1.0pA typical input bias current (±10pA max over temp), 75–108dB large-signal voltage gain, and unity-gain stability with capacitive loads up to 5000pF. No phase reversal occurs under overdriven inputs, and no external reference bypass capacitor is required - though none is present since the device lacks an internal reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Amplifier Count | Dual - enables two independent signal paths (e.g., sensor conditioning + reference buffer) in one 8-pin µMAX package. |
| Supply Voltage Range | +1.4V to +3.6V - supports direct operation from aging single-cell Li⁺ (2.7–4.2V nominal, but usable down to 1.4V) or two-cell alkaline (up to 3.2V fresh). |
| Supply Current (total) | 2.9µA (min) to 3.2µA (max) at VDD = 1.4V–3.6V - enables >10-year battery life in always-on micropower systems drawing <100nA average. |
| Input Offset Voltage | ±8mV (max over –40°C to +85°C) - sufficient for pH meter front-ends or thermistor amplification where <1% accuracy is acceptable. |
| Input Bias Current | ±100pA (max over temperature) - critical for high-impedance electrode interfaces (e.g., glass pH electrodes, ion-selective membranes). |
| Rail-to-Rail Output Swing | Within 25mV of VSS/VDD into 5kΩ - preserves dynamic range in low-voltage ADC interfacing (e.g., 12-bit SAR with 3V reference). |
| Gain-Bandwidth Product | 4kHz - suitable for DC-coupled sensor signal conditioning (thermistors, RTDs, strain gauges) but not audio or fast pulse amplification. |
Pinout & Package
MAX4038EUA+ is housed in an 8-pin µMAX package (3mm × 3mm × 1.1mm, RoHS-compliant, exposed pad optional). Pin 1 is top-left corner (notch-marked); pin numbering proceeds counterclockwise.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input of Channel A - high-impedance node (Zin > 10¹²Ω) for sensor voltage pickup. |
| 2 | VSS | Negative supply rail - must be connected to system ground; exposed pad (if soldered) ties to VSS for thermal and noise performance. |
| 3 | IN− | Inverting input of Channel A - used for feedback configuration (e.g., transimpedance, differential gain). |
| 4 | OUT | Output of Channel A - rail-to-rail capable; drives 5kΩ load to within 25mV of VSS/VDD. |
| 5 | VDD | Positive supply rail - accepts 1.4V–3.6V single supply; bypass with 0.1µF ceramic capacitor to VSS. |
| 6 | OUTB | Output of Channel B - independent output; shares same VDD/VSS rails as Channel A. |
| 7 | INB− | Inverting input of Channel B - electrically isolated from Channel A; supports dual-sensor or differential pair topology. |
| 8 | INB+ | Noninverting input of Channel B - matched input characteristics to IN+ (same IB, VOS drift, CMRR). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 800nA per amplifier supply current | Enables multi-year operation on coin-cell batteries in wireless sensor nodes and portable medical devices. |
| Rail-to-rail output driving 5kΩ and 5000pF | Eliminates need for level-shifting or external buffers when interfacing with low-voltage ADCs or microcontroller GPIOs. |
| No phase reversal on overdriven inputs | Prevents latch-up or erroneous output states during sensor transient events (e.g., ESD on electrode lines). |
| Low 200µV typical input offset voltage | Reduces calibration burden in precision analog front-ends such as potentiostats and electrometer amplifiers. |
| Unity-gain stable with ≥5000pF capacitive load | Allows direct connection to long PCB traces or cables without destabilizing oscillation - simplifies layout in handheld instruments. |
Applications
| pH Meter Front-End | Remote Electrochemical Sensor |
|---|---|
Use Scenario: Amplifying mV-level output from glass pH electrode in handheld field meter. IC Role / Device Role / Timing Role: Dual op amp configured as high-Z buffer (Channel A) and precision difference amplifier (Channel B) against temperature-compensated reference. Use Value: 800nA per amplifier current and ±100pA input bias enable stable 0.01pH resolution without frequent zeroing or active guarding. |
Use Scenario: Signal conditioning for buried soil moisture/EC sensor transmitting data via LoRaWAN every 15 minutes. IC Role / Device Role / Timing Role: Dual amplifier for sensor excitation (constant-current source) and ratiometric measurement (voltage across sense resistor). Use Value: 1.4V minimum supply allows operation down to 1.5V battery voltage, extending field deployment interval by 30% vs. 1.8V-minimum alternatives. |
| Portable Glucose Monitor | Two-Electrode Potentiostat |
Use Scenario: Amperometric detection of glucose oxidase reaction current in disposable test strip reader. IC Role / Device Role / Timing Role: Transimpedance amplifier (Channel A) converting pA–nA current to voltage; Channel B buffers reference electrode potential. Use Value: ±100pA max input bias current minimizes offset error in low-current measurement, improving assay accuracy at sub-100mg/dL concentrations. |
Use Scenario: Compact corrosion monitoring unit measuring polarization resistance on steel rebar in concrete. IC Role / Device Role / Timing Role: Dual op amp implementing potentiostatic control loop: one channel sources controlled voltage, the other measures current through working electrode. Use Value: Rail-to-rail output swing ensures full utilization of 3V ADC range, while 4kHz GBW supports 10Hz impedance sweep without phase lag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4038ETA+ | Same dual op amp core, but in 8-pin TDFN-EP (3mm × 3mm) with exposed paddle tied to VSS - lower thermal resistance (24.4mW/°C derating vs. 4.5mW/°C for µMAX). | TDFN requires tighter layout control and reflow profile; unsuitable for hand-soldering or prototyping with breakout boards. | Select MAX4038ETA+ for production designs needing enhanced thermal performance in sealed enclosures or high ambient temperatures. |
| LTC1540CMS8#PBF | Single micropower op amp + voltage reference (1.182V) in MSOP-8; 1µA supply current; no rail-to-rail output (swing limited to VDD − 150mV). | Not dual-channel; reference integrated but fixed and non-buffered - cannot replace MAX4038EUA+ in dual-signal-path designs without redesign. | Consider LTC1540 only for space-constrained single-channel applications where reference integration outweighs channel count loss. |
Compared with MAX4038ETA+, MAX4038EUA+ offers identical electrical performance in a more prototyping-friendly µMAX package, while LTC1540CMS8#PBF trades channel count and rail-to-rail capability for integrated reference - making it a functional alternative only in simplified single-amplifier topologies.
Availability
MAX4038EUA+ is available at Aetrix Electronics and suitable for battery-powered medical instrumentation, remote environmental sensors, and portable electrochemical analyzers requiring stable component supply across extended product lifecycles.
Supply support for MAX4038EUA+ 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 was engineered specifically for ultra-low-power, low-voltage sensor signal conditioning - targeting applications where supply voltage drops below 1.8V and quiescent current must remain sub-1µA per amplifier.
FAQ
What is the supply voltage range for MAX4038EUA+?
The MAX4038EUA+ operates from a single +1.4V to +3.6V supply. This range is validated across –40°C to +85°C and enables direct interface with aging single-cell lithium-ion batteries (down to 1.4V) or two-cell alkaline/NiMH sources. Operation below 1.4V is not guaranteed, and absolute maximum rating is +4.0V.
Does MAX4038EUA+ include an internal voltage reference?
No, MAX4038EUA+ does not include an internal voltage reference. It is the dual-op-amp-only variant in the MAX4036–MAX4039 family. Reference functionality is exclusive to MAX4037 (single + ref) and MAX4039 (dual + ref). The MAX4038EUA+ pinout has no REF pin - pins 1–8 are strictly IN+, VSS, IN−, OUTA, VDD, OUTB, INB−, INB+.
What is the input bias current specification for MAX4038EUA+ over temperature?
The MAX4038EUA+ has a maximum input bias current of ±100pA over the full –40°C to +85°C operating range. At +25°C, typical input bias current is 1.0pA. This ultra-low IB enables high-fidelity amplification of signals from high-impedance sources like pH electrodes, photodiodes, and piezoelectric sensors without significant DC error.
Can MAX4038EUA+ drive a 10nF capacitive load stably?
Yes, MAX4038EUA+ is unity-gain stable with capacitive loads up to 5000pF (5nF) - confirmed in the datasheet's "Capacitive-Load Stability" specification. No external isolation resistor is required for 10nF loads. However, gain reduction and reduced output swing may occur if a series resistor is added; direct connection is preferred for optimal performance.
Is MAX4038EUA+ pin-compatible with MAX4039EUA+?
No, MAX4038EUA+ is not pin-compatible with MAX4039EUA+. While both are 8-pin µMAX dual op amps, MAX4039EUA+ includes a dedicated REF pin (replacing Pin 6, which is OUTB on MAX4038EUA+). MAX4038EUA+ Pin 6 = OUTB; MAX4039EUA+ Pin 6 = REF. Swapping them requires PCB redesign and changes to reference routing and decoupling.
MAX4038EUA+ 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:
- 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:
- 1.9µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 1.4 V
- Voltage - Supply Span (Max):
- 3.6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4038EUA+ FAQ
1.How can I place an order for MAX4038EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4038EUA+ 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 MAX4038EUA+ reliable?
The price and inventory of MAX4038EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4038EUA+ is usually 5 days.
3.What payment methods are accepted for MAX4038EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4038EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4038EUA+?
MAX4038EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4038EUA+ 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 MAX4038EUA+?
For technical support, including MAX4038EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4038EUA+ requirements.
6.How does Aetrix verify that MAX4038EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4038EUA+ 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 MAX4038EUA+ meets industry standards.
7.What is the process for return or replacement of MAX4038EUA+?
All MAX4038EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4038EUA+, 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 MAX4038EUA+ part is unused and in its original packaging.
Return procedure for MAX4038EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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