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Analog Devices Inc./Maxim Integrated MAX4038ETA+T
- Part No.:
- MAX4038ETA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX4038ETA+T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,150
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Product details
Overview
MAX4038ETA+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 supply current (typical at VDD = 1.4V–3.6V). It features 800nA per amplifier quiescent current, 200µV typical input offset voltage, and rail-to-rail output swing within 25mV of rails into 5kΩ - optimized for single-cell Li⁺ or two-cell alkaline/NiMH battery-powered pH meters, remote sensor amplifiers, and micropower thermostats.
For engineers reviewing the MAX4038ETA+T datasheet, MAX4038ETA+T pinout, MAX4038ETA+T application, or MAX4038ETA+T equivalent, this page delivers verified electrical specs, package-validated pin functions, real-world use-value metrics, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX4038ETA+T implements a BiCMOS input stage enabling ultra-low input bias current (±1.0pA typ) and rail-to-rail output drive without external compensation. Its common-mode input range extends from VSS to VDD − 0.4V at 1.4V supply, supporting direct sensing near ground in low-voltage systems.
It is unity-gain stable and drives up to 5000pF capacitive loads without oscillation, with phase margin ≥90° and gain-bandwidth product of 4kHz - making it suitable for precision DC-coupled signal conditioning where power budget and input impedance are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.4V to +3.6V - enables operation directly from single Li⁺ cell (2.7–4.2V nominal decayed to 1.4V cutoff) without regulator. |
| Total Supply Current | 2.9–3.2µA (typ, VDD = 1.4–3.6V) - supports >1-year battery life in always-on sensor nodes drawing <1µA average system current. |
| Input Offset Voltage | ±200µV (typ), ±8mV (max, full temp range) - ensures ≤0.02% error in 10mV–100mV sensor signal amplification (e.g., pH electrode outputs). |
| Input Bias Current | ±1.0pA (typ), ±100pA (max, −40°C to +85°C) - preserves high-impedance source integrity (e.g., glass pH electrodes, piezoresistive sensors). |
| Output Swing (5kΩ) | VDD − 25mV (high), 25mV above VSS (low) - delivers full dynamic range across entire supply, critical for ADC input scaling in low-voltage systems. |
| Gain-Bandwidth Product | 4kHz - sufficient for DC–100Hz biosignal and environmental sensor conditioning (ECG, temperature, gas sensing) with minimal phase lag. |
| Capacitive Load Stability | Stable up to 5000pF - eliminates need for isolation resistors when driving long traces or ADC input capacitance directly. |
Pinout & Package
MAX4038ETA+T is packaged in an 8-pin TDFN-EP (3mm × 3mm, 0.8mm height) with exposed paddle connected to VSS. Pin 1 is marked by dot; EP must be soldered to VSS or left floating per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input of Channel A - high-impedance node (1.0pA bias) for precision differential or single-ended sensing. |
| 2 | VSS | Negative supply rail - reference for all inputs/outputs; EP internally tied to VSS in TDFN package. |
| 3 | IN− | Inverting input of Channel A - used with IN+ for closed-loop gain configuration or as comparator input. |
| 4 | OUT | Amplifier output of Channel A - rail-to-rail capable, drives 5kΩ load to within 25mV of VDD/VSS. |
| 5 | VDD | Positive supply rail - accepts 1.4–3.6V; bypass with 0.1µF capacitor to VSS for noise immunity. |
| 6 | OUTB | Amplifier output of Channel B - independent output; shares same supply and bias network as Channel A. |
| 7 | INB− | Inverting input of Channel B - enables dual-channel instrumentation (e.g., differential pair + reference buffer). |
| 8 | INB+ | Noninverting input of Channel B - identical electrical characteristics to IN+/IN−; supports parallel sensor channels. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 800nA per amplifier supply current | Enables dual-op-amp functionality in sub-µA system budgets - e.g., simultaneous sensor excitation and signal conditioning in wearable medical devices. |
| Rail-to-rail output driving 5kΩ and 5000pF | Eliminates level-shifting circuitry and external buffers when interfacing to SAR or delta-sigma ADCs with >10pF input capacitance. |
| No phase reversal on overdriven inputs | Prevents latch-up or erroneous output states during transient input overload - critical in unattended remote sensor deployments. |
| Low 200µV input offset voltage (typ) | Reduces calibration burden in factory-trimmed analog front-ends; maintains <0.1% gain error in 100× gain stages. |
| Unity-gain stable | Supports direct use as voltage follower without stability compensation - simplifies PCB layout and reduces component count in signal buffering. |
Applications
| pH Meter Front-End | Remote Gas Sensor Amplifier |
|---|---|
|
Use Scenario: Amplifying mV-level Nernst potential from glass pH electrode in portable handheld meter. IC Role / Device Role / Timing Role: Dual-channel op amp: Channel A as high-Z buffer for electrode, Channel B as reference voltage follower or differential amplifier. Use Value: 1.0pA input bias prevents electrode polarization; rail-to-rail output fully utilizes 12-bit ADC range from 1.4V supply. |
Use Scenario: Conditioning low-current output (nA–µA) from electrochemical CO sensor in battery-powered air quality monitor. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with feedback resistor; second channel for reference or temperature compensation. Use Value: 800nA per amplifier current allows continuous 24/7 operation on coin cell; 200µV offset minimizes zero-drift calibration frequency. |
| Micropower Thermostat | Electrometer Amplifier |
|
Use Scenario: Amplifying thermistor voltage divider output in HVAC control unit powered by two AA alkaline cells. IC Role / Device Role / Timing Role: Precision gain stage before low-power microcontroller ADC; operates down to 1.4V battery end-of-life. Use Value: 1.4V minimum supply extends usable battery life by >30% vs. 1.8V alternatives; 25mV output swing headroom ensures ADC full-scale accuracy. |
Use Scenario: Measuring ultra-low leakage current (<100pA) across insulation material in portable test equipment. IC Role / Device Role / Timing Role: Femtoampere-class electrometer configured as current-to-voltage converter with guarded input. Use Value: ±1.0pA input bias current enables <1% measurement error at 100pA; no external reference required simplifies guarding layout. |
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 |
|---|---|---|---|
| MAX4038EUA | Same die, 8-pin µMAX package (3mm × 3mm, 1.1mm height); no exposed paddle; higher thermal resistance (4.5mW/°C derating). | Preferred for space-constrained PCBs where TDFN reflow compatibility is not required; less effective heat dissipation in high ambient. | Select MAX4038EUA when footprint compatibility with legacy µMAX layouts is needed; avoid in >85°C ambient or high-duty-cycle operation. |
| LTC1540CMS8#TRPBF | Single 1.2µA op amp + reference; no dual-channel capability; 1.2V reference output; higher 1.2mV max VOS. | Suitable only for single-channel applications requiring internal reference; cannot replace dual-channel function of MAX4038ETA+T without redesign. | Choose LTC1540 only if reference integration is mandatory and channel count can be reduced; not a functional substitute for dual-amplifier use cases. |
Compared with MAX4038EUA, MAX4038ETA+T offers superior thermal performance via EP-to-VSS connection and tighter board-level EMI control; compared with LTC1540, it provides true dual-channel operation without sacrificing supply current efficiency or input bias performance.
Availability
MAX4038ETA+T is available at Aetrix Electronics and suitable for battery-powered pH meters, remote environmental sensors, and micropower thermostats requiring stable component supply across extended production lifecycles.
Supply support for MAX4038ETA+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, low-voltage signal conditioning in battery-operated instrumentation - emphasizing femtoampere input bias, rail-to-rail operation below 1.8V, and minimal quiescent current without performance trade-offs.
FAQ
What is the maximum operating temperature range for MAX4038ETA+T?
The MAX4038ETA+T is rated for operation from −40°C to +85°C. This industrial temperature range is validated across all key parameters including supply current, input offset voltage, and common-mode rejection ratio - ensuring reliable performance in outdoor sensor housings, automotive cabin modules, and portable medical devices exposed to ambient thermal cycling.
Does MAX4038ETA+T include an integrated voltage reference?
No, MAX4038ETA+T does not include an integrated voltage reference. It is the dual-amplifier-only variant in the MAX4036–MAX4039 family. The MAX4039 variants (e.g., MAX4039ETB-T) integrate a 1.232V buffered reference. MAX4038ETA+T must be used with an external reference or in open-loop/comparator configurations where reference is supplied externally.
Can MAX4038ETA+T drive a 10kΩ load rail-to-rail?
Yes - MAX4038ETA+T drives 10kΩ loads to within 5mV of the rails (per Typical Operating Characteristics, Figure 1), exceeding the 25mV spec guaranteed for 5kΩ. This enhanced swing at higher impedances improves dynamic range utilization in high-impedance ADC interfaces and low-power comparators without additional gain stages.
Is the exposed paddle (EP) on MAX4038ETA+T required to be connected?
The exposed paddle on MAX4038ETA+T is internally connected to VSS and should be soldered to a VSS copper pour for optimal thermal performance and noise immunity. Leaving it unconnected is permitted per datasheet but degrades thermal resistance by ~20°C/W and increases susceptibility to ground bounce in noisy environments.
What is the power-on settling time of MAX4038ETA+T?
MAX4038ETA+T requires 0.25ms to settle within 1% of final output value after power application (per Electrical Characteristics table, Note 3). This fast wake-up supports duty-cycled sensor acquisition - e.g., waking every 100ms to take a reading and returning to sleep, minimizing average system current.
MAX4038ETA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- 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 (x2 Channels)
- 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-TDFN (3x3)
MAX4038ETA+T FAQ
1.How can I place an order for MAX4038ETA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4038ETA+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 MAX4038ETA+T reliable?
The price and inventory of MAX4038ETA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4038ETA+T is usually 5 days.
3.What payment methods are accepted for MAX4038ETA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4038ETA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4038ETA+T?
MAX4038ETA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4038ETA+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 MAX4038ETA+T?
For technical support, including MAX4038ETA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4038ETA+T requirements.
6.How does Aetrix verify that MAX4038ETA+T is sourced from the original manufacturer or authorized distributors?
All MAX4038ETA+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 MAX4038ETA+T meets industry standards.
7.What is the process for return or replacement of MAX4038ETA+T?
All MAX4038ETA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4038ETA+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 MAX4038ETA+T part is unused and in its original packaging.
Return procedure for MAX4038ETA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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