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Analog Devices Inc./Maxim Integrated MAX4038EUA+T
- Part No.:
- MAX4038EUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4038EUA+T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:9,830
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Product details
Overview
MAX4038EUA+T 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 = 1.4–3.6V. 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. It is designed for ultra-low-power, single-cell Li⁺ or two-cell alkaline/NiMH battery-powered sensor front-ends and potentiostats.
For engineers reviewing the MAX4038EUA+T datasheet, MAX4038EUA+T pinout, MAX4038EUA+T application, or MAX4038EUA+T equivalent, key selection criteria include micropower operation below 3.2µA total supply current, guaranteed rail-to-rail output drive into 5kΩ/5000pF, absence of internal reference (distinguishing it from MAX4039), and µMAX® 8-pin package compatibility with space-constrained portable medical and remote sensing designs.
Technical Context
The MAX4038EUA+T implements a BiCMOS input stage enabling ultra-low input bias current (±10pA max over –40°C to +85°C) and rail-to-rail output stage capable of sourcing/sinking ±13mA while maintaining <25mV swing margin into 5kΩ loads. Its common-mode input range extends from VSS to VDD – 0.4V at VDD = 1.4V, supporting direct interfacing with low-voltage sensors without level-shifting.
It is unity-gain stable and drives capacitive loads up to 5000pF without external compensation. Unlike MAX4037/MAX4039, it omits the 1.232V buffered reference - confirmed by ordering guide, functional diagram, and electrical characteristics tables - making it suitable where external reference control or no reference is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.4V to +3.6V - supports direct operation from single Li⁺ cell (2.7–4.2V nominal, but valid down to 1.4V cutoff) or two alkaline/NiMH cells (1.2–1.5V each). |
| Total Supply Current | 2.9µA (min) to 3.2µA (max) at TA = –40°C to +85°C - enables >10-year battery life in always-on sensor nodes drawing <3.2µA continuously. |
| Input Offset Voltage | ±8mV (max over temp) - sufficient for precision DC-coupled amplification in pH meters and thermistor interfaces where sub-mV accuracy is not required. |
| Input Bias Current | ±100pA (max over temp) - enables high-impedance electrode sensing (e.g., glass pH electrodes, ion-selective membranes) without significant error. |
| Rail-to-Rail Output Swing | Within 25mV of VSS/VDD into 5kΩ - preserves full dynamic range when driving ADC inputs or low-voltage comparators directly. |
| Gain-Bandwidth Product | 4kHz - suitable for DC–1kHz signal conditioning (e.g., ECG front-end, temperature loop feedback, slow-scan potentiostats). |
| Capacitive Load Drive | Stable with up to 5000pF - eliminates need for isolation resistors when driving long PCB traces or ADC input capacitance. |
Pinout & Package
The MAX4038EUA+T is housed in an 8-pin µMAX® package (3mm × 3mm, 0.8mm height), RoHS-compliant, with exposed paddle electrically isolated (not connected to VSS in µMAX variant per package drawings).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input of Channel A - high-impedance node for sensor signal injection; accepts common-mode voltages from VSS to VDD – 0.4V at low supply. |
| 2 | VSS | Negative power-supply terminal - must be connected to system ground; serves as reference for all inputs/outputs. |
| 3 | IN− | Inverting input of Channel A - used for closed-loop gain configuration or differential sensing with IN+. |
| 4 | OUT | Output of Channel A - rail-to-rail capable; drives 5kΩ load to within 25mV of VSS/VDD. |
| 5 | VDD | Positive power-supply terminal - accepts 1.4V–3.6V; bypass with 0.1µF capacitor to VSS for noise immunity. |
| 6 | OUTB | Output of Channel B - independent rail-to-rail output; enables dual-channel signal conditioning without cross-talk (crosstalk < –60dB @ 1kHz). |
| 7 | INB− | Inverting input of Channel B - fully independent channel; allows simultaneous processing of two sensor signals. |
| 8 | INB+ | Noninverting input of Channel B - matches Channel A's input specs; supports matched dual instrumentation topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 800nA per amplifier supply current | Enables dual-channel amplification at <3.2µA total, extending battery life in maintenance-free remote sensors. |
| Rail-to-rail output driving 5kΩ and 5000pF | Eliminates external buffer stages and output isolation resistors, reducing BOM count and board area in compact designs. |
| No internal voltage reference | Provides design flexibility: avoids reference loading errors and allows use of higher-accuracy external references or ratiometric ADC configurations. |
| No phase reversal on overdriven inputs | Prevents latch-up or erroneous output states during sensor transients (e.g., electrode contact bounce, ESD events). |
| Unity-gain stable | Supports direct use in voltage-follower configurations without stability compensation, simplifying low-gain sensor interface circuits. |
Applications
| pH Meter Front-End | Potentiostat Electrode Interface |
|---|---|
Use Scenario: Amplifying mV-level output from glass pH electrode in handheld or portable meter. IC Role / Device Role / Timing Role: Dual-channel op amp providing high-input-impedance buffer (Channel A) and reference buffer or differential amplifier (Channel B). Use Value: ±100pA max input bias current prevents electrode polarization error; rail-to-rail output ensures full-scale utilization of 12-bit ADC input range. |
Use Scenario: Three-electrode electrochemical cell control in portable blood glucose or environmental ion sensors. IC Role / Device Role / Timing Role: Precision amplifier for working electrode feedback (Channel A) and counter electrode drive (Channel B) in constant-current potentiostat loop. Use Value: 200µV typical VOS and low drift enable accurate current measurement; 4kHz GBW supports stable loop response up to ~400Hz. |
| Remote Wireless Sensor Node | Low-Power Thermostat Signal Chain |
Use Scenario: Battery-powered soil moisture or gas sensor transmitting data via BLE/LPWAN every 5 minutes. IC Role / Device Role / Timing Role: Dual op amp conditioning analog outputs from humidity/temperature/CO₂ sensors before ADC sampling and sleep-mode shutdown. Use Value: Sub-3.2µA total quiescent current minimizes average power draw; no-reference architecture avoids reference startup delay during wake-up bursts. |
Use Scenario: Line-powered or battery-backed HVAC thermostat measuring NTC thermistor and driving display backlight dimming circuitry. IC Role / Device Role / Timing Role: One amplifier buffers thermistor divider; second drives MOSFET gate for LED current control in analog dimming loop. Use Value: Rail-to-rail output ensures full 0–3.3V control range for PWM-equivalent analog dimming; 1.4V min supply allows operation during brown-out conditions. |
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 |
|---|---|---|---|
| MAX4039EUA+ | Includes integrated 1.232V ±0.5% reference; 5.2–5.3µA total supply current; same pinout except REF pin replaces N.C. | Required where internal buffered reference simplifies design (e.g., ratiometric ADC biasing); unsuitable if reference adds noise or loading error. | Select MAX4039EUA+ only when reference functionality is needed - MAX4038EUA+T provides lower current and no reference interference. |
| LTC1540CMS8#TRPBF | Single micropower op amp + reference (1.182V); 1.1µA supply current; 8-pin MSOP package; no rail-to-rail output (swing limited to VDD–120mV). | Lower power but single-channel; reference not buffered; output swing insufficient for full-scale 3.3V ADC interfacing. | Use LTC1540 only for single-channel, ultra-low-power (<1.5µA) applications where rail-to-rail output is not required. |
Compared with MAX4039EUA+, the MAX4038EUA+T saves >2µA supply current and removes reference-related noise/accuracy trade-offs; compared with LTC1540, it delivers dual channels and true rail-to-rail output at modest current penalty, enabling more flexible sensor signal chains.
Availability
MAX4038EUA+T is available at Aetrix Electronics and suitable for battery-powered medical instrumentation, remote environmental sensors, and micropower thermostats requiring stable component supply across extended product lifecycles.
Supply support for MAX4038EUA+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 applications.
The MAX4036–MAX4039 family was designed specifically for ultra-low-power, low-voltage sensor signal conditioning in battery-constrained systems - emphasizing sub-1µA-per-amplifier operation, rail-to-rail I/O, and robust performance down to 1.4V supply.
FAQ
What is the supply voltage range for the MAX4038EUA+T?
The MAX4038EUA+T operates from a single +1.4V to +3.6V supply. This range is validated across –40°C to +85°C and supports direct connection to single-cell lithium-ion batteries (down to 1.4V cutoff) or two-cell alkaline/NiMH sources. Operation below 1.4V is not guaranteed and may result in degraded rail-to-rail output swing or increased input offset voltage.
Does the MAX4038EUA+T include an internal voltage reference?
No, the MAX4038EUA+T does not include an internal voltage reference. Unlike the MAX4039EUA+, which integrates a 1.232V buffered reference on Pin 6, the MAX4038EUA+T uses Pin 6 as a no-connect (N.C.) terminal. This is confirmed in the Pin Configurations section, Selector Guide, and functional diagram - making MAX4038EUA+T ideal where external reference control or zero-reference interference is required.
What is the maximum capacitive load the MAX4038EUA+T can drive stably?
The MAX4038EUA+T is unity-gain stable and drives capacitive loads up to 5000pF without external compensation or isolation resistors. This capability is specified in the Electrical Characteristics table under "Capacitive-Load Stability" and verified in Typical Operating Characteristics (Figure 17). Loads exceeding 5000pF require an isolation resistor to maintain phase margin >45°.
What is the input common-mode voltage range of the MAX4038EUA+T?
At VDD = 1.4V, the input common-mode voltage range is guaranteed from VSS to VDD – 0.4V (i.e., 0V to 1.0V). At higher supplies (e.g., VDD = 3.3V), the range extends to VSS to VDD – 0.2V. This specification is explicitly stated in the Electrical Characteristics table and applies to both amplifier channels of the MAX4038EUA+T across its full operating temperature range.
Is the MAX4038EUA+T pin-compatible with other devices in the MAX4036–MAX4039 family?
The MAX4038EUA+T shares the same 8-pin µMAX® pinout with MAX4038A, MAX4039, and MAX4039A in µMAX packages, but is not pin-compatible with MAX4036 (5-pin SC70) or MAX4037 (6-pin SOT23). Within the µMAX variants, Pin 6 is N.C. on MAX4038EUA+T but functions as REF on MAX4039EUA+ - requiring PCB layout revision if substituting between these two parts.
MAX4038EUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-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:
- 1.9µA
- Current - Output / Channel:
- 13 mA
- 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+T FAQ
1.How can I place an order for MAX4038EUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4038EUA+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 MAX4038EUA+T reliable?
The price and inventory of MAX4038EUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4038EUA+T is usually 5 days.
3.What payment methods are accepted for MAX4038EUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4038EUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4038EUA+T?
MAX4038EUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4038EUA+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 MAX4038EUA+T?
For technical support, including MAX4038EUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4038EUA+T requirements.
6.How does Aetrix verify that MAX4038EUA+T is sourced from the original manufacturer or authorized distributors?
All MAX4038EUA+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 MAX4038EUA+T meets industry standards.
7.What is the process for return or replacement of MAX4038EUA+T?
All MAX4038EUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4038EUA+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 MAX4038EUA+T part is unused and in its original packaging.
Return procedure for MAX4038EUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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