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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:4,769
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Product details
Overview
MAX4038ETA-T from Maxim Integrated is a dual, rail-to-rail output operational amplifier with no integrated voltage reference, operating from +1.4V to +3.6V supply and consuming only 2.9–3.2µA total supply current (1.45–1.6µA per amplifier) at VDD = 1.4V–3.6V over -40°C to +85°C. It features 800nA per-amplifier quiescent current, 200µV typical input offset voltage, and rail-to-rail output swing within 25mV of rails into 5kΩ loads - 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, key selection criteria include ultra-low supply current at sub-1.8V operation, guaranteed input common-mode range down to VSS and up to VDD − 0.4V at 1.4V supply, absence of internal reference, TDFN-EP package thermal performance, and compatibility with capacitive loads up to 5000pF without external compensation.
Technical Context
The MAX4038ETA-T implements a BiCMOS input stage enabling ultra-low input bias current (±1.0pA typ, ±100pA max over temperature) and rail-to-rail output stage capable of sourcing/sinking ±13mA while maintaining <40mV rail proximity into 5kΩ. Its unity-gain stability and 4kHz gain-bandwidth product support precision DC-coupled sensing in low-noise, high-impedance signal chains.
No internal voltage reference is present - unlike MAX4037/MAX4039 - eliminating reference load regulation, line regulation, and reference noise considerations. The device relies on external reference or ratiometric ADC interfacing, simplifying power architecture in systems where reference generation is centralized or omitted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.4V to +3.6V - enables direct operation from single Li⁺ cell (2.7–4.2V nominal decayed to 1.4V) without LDO. |
| Supply Current (total) | 2.9–3.2µA at VDD = 1.4–3.6V - ensures >10-year battery life in coin-cell-powered remote sensors. |
| Input Offset Voltage | ±2.0mV max (±8mV over temp) - supports 12-bit accuracy in 3V full-scale systems without trimming. |
| Input Bias Current | ±10pA typ / ±100pA max - preserves signal integrity in picoamp-level electrochemical (pH, potentiostat) front-ends. |
| Rail-to-Rail Output Swing | Within 25mV of rails into 5kΩ - maximizes dynamic range for low-voltage ADCs (e.g., 1.8V SAR). |
| Gain-Bandwidth Product | 4kHz - sufficient for DC–100Hz sensor conditioning (thermistors, strain gauges, pH electrodes). |
| Capacitive Load Stability | Stable up to 5000pF - eliminates need for isolation resistor when driving long traces or ADC input capacitance. |
Pinout & Package
MAX4038ETA-T is housed in an 8-pin TDFN-EP package (3mm × 3mm × 0.8mm) with exposed paddle thermally connected to VSS. The EP must be soldered to a VSS copper plane or left unconnected per Maxim's layout guidance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input of Channel A - high-impedance node requiring guard ring in pH meter designs. |
| 2 | VSS | Negative supply - reference for all inputs/outputs; connects to EP for thermal management. |
| 3 | IN− | Inverting input of Channel A - used for transimpedance or differential configurations. |
| 4 | OUTA | Output of Channel A - rail-to-rail capable; drives 5kΩ load to within 25mV of VDD/VSS. |
| 5 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor to VSS per layout guidelines. |
| 6 | OUTB | Output of Channel B - independent output; shares same supply and thermal path as OUTA. |
| 7 | INB− | Inverting input of Channel B - enables dual-sensor monitoring (e.g., pH + temperature). |
| 8 | INB+ | Noninverting input of Channel B - matches IN+ electrical characteristics for matched channel performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 800nA per amplifier supply current | Enables >10-year operation on CR2032 (225mAh) in always-on sensor nodes drawing ≤1µA average. |
| Rail-to-rail output driving 5kΩ and 5000pF | Eliminates external output buffer and isolation resistor - reduces BOM count and PCB area in space-constrained wearables. |
| No phase reversal for overdriven inputs | Prevents latch-up or erroneous output states during sensor transient events (e.g., electrode insertion in pH probe). |
| Low 200µV input offset voltage | Reduces calibration burden in factory-trimmed medical devices - supports 12-bit resolution without software correction. |
| Unity-gain stable | Permits direct use in follower, summing, and difference configurations without compensation network design effort. |
Applications
| pH Meters | Remote Sensor Amplifiers |
|---|---|
Use Scenario: High-impedance glass electrode interface measuring 0–14 pH in portable field instruments. IC Role / Device Role / Timing Role: Dual-channel transimpedance amplifier converting pA-level electrode current to buffered voltage for 16-bit ADC. Use Value: 1.4V minimum supply allows operation down to depleted Li⁺ cell voltage (1.5V), extending field deployment time by 30% vs. 1.8V-only op amps. | Use Scenario: Battery-powered soil moisture and temperature node transmitting data via LoRaWAN every 15 minutes. IC Role / Device Role / Timing Role: Dual op amp conditioning resistive humidity and thermistor signals before multiplexed ADC sampling. Use Value: 2.9µA total supply current enables 12-year battery life on 2×AA cells (3000mAh), assuming 10ms active time per transmission cycle. |
| Micropower Thermostats | Electrometer Amplifiers |
Use Scenario: HVAC wall thermostat using thermistor bridge and mechanical relay control, powered by single AA cell. IC Role / Device Role / Timing Role: Precision difference amplifier rejecting common-mode noise from 50/60Hz EMI in residential wiring environments. Use Value: Input common-mode range to VSS enables direct ground-referenced bridge sensing - removes need for level-shifting circuitry. | Use Scenario: Lab-grade electrometer measuring leakage current (<1pA) across insulating materials under bias. IC Role / Device Role / Timing Role: Ultra-low IB amplifier in guarded feedback path of transimpedance configuration with >10¹²Ω feedback resistor. Use Value: ±1.0pA typical input bias current limits measurement error to <0.1% at 1pA signal - meets ASTM D257 requirements. |
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 dual op amp function, identical electrical specs, but in 8-pin µMAX package (3mm × 3mm, 1.1mm height) without exposed paddle. | Lower thermal resistance not required; suitable for non-continuous high-load or lower ambient temperature environments. | Select MAX4038EUA when board assembly uses µMAX-compatible footprint and thermal dissipation <100mW is sufficient. |
| LTC1540CMS8#PBF | Dual op amp with 1.2V reference (not present in MAX4038ETA-T); higher 1.2µA per amplifier supply current; 10-pin MSOP package. | Reference-integrated design simplifies single-supply ratiometric ADC interfaces but increases quiescent current by 2.4×. | Select LTC1540 when system requires on-chip reference and can tolerate higher supply current; not drop-in compatible due to pinout and reference presence. |
Compared with MAX4038EUA, MAX4038ETA-T offers superior thermal performance via EP connection to VSS - critical for sustained 5kΩ load drive at 85°C. Compared with LTC1540, MAX4038ETA-T delivers 2.4× lower supply current and no reference-related load regulation errors, but requires external reference if needed.
Availability
MAX4038ETA-T is available at Aetrix Electronics and suitable for pH meters, remote sensor amplifiers, and micropower thermostats requiring stable component supply across industrial temperature ranges and long-life battery operation.
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 industrial, medical, and communications applications.
The MAX4036–MAX4039 family targets ultra-low-power, low-voltage sensor signal conditioning - specifically engineered for battery-operated instrumentation where supply current below 1µA per amplifier and operation down to 1.4V are mandatory.
FAQ
What is the minimum supply voltage for reliable operation of the MAX4038ETA-T?
The MAX4038ETA-T guarantees operation down to +1.4V supply voltage across its full -40°C to +85°C temperature range, as confirmed by PSRR testing in the datasheet. At 1.4V, it maintains rail-to-rail input common-mode range (VSS to VDD − 0.4V) and 2.9µA total supply current. Operation below 1.4V is not characterized and may result in degraded CMRR, PSRR, or output swing.
Does the MAX4038ETA-T include an integrated voltage reference?
No, the MAX4038ETA-T does not include an integrated voltage reference. It is the dual-op-amp-only variant in the MAX4036–MAX4039 family. Reference functionality is exclusive to MAX4037 (single) and MAX4039 (dual) variants. The MAX4038ETA-T pinout omits the REF pin entirely - confirming absence of reference circuitry.
What is the maximum capacitive load the MAX4038ETA-T can drive without external compensation?
The MAX4038ETA-T is unity-gain stable and specified to drive up to 5000pF capacitive load without oscillation or peaking, as verified in the Electrical Characteristics table and Typical Operating Characteristics (Figure toc17). This capability eliminates the need for series isolation resistors when interfacing with ADC input capacitance or long PCB traces.
How does the exposed paddle (EP) on the MAX4038ETA-T TDFN package function?
The exposed paddle on the MAX4038ETA-T is internally connected to VSS and serves as the primary thermal conduction path. Maxim recommends soldering the EP to a VSS copper plane for optimal thermal performance - especially critical when driving 5kΩ loads continuously at 85°C. Leaving the EP unconnected is permitted but degrades θJA by ~20°C/W.
Can the MAX4038ETA-T be used in a three-electrode potentiostat configuration?
Yes, the MAX4038ETA-T is explicitly validated for three-electrode potentiostat applications per the datasheet's "Typical Operating Circuit" diagram (page 1). Its ultra-low input bias current (±1.0pA typ), rail-to-rail output, and 1.4V operation make it suitable for driving counter electrodes while sensing working electrode current with minimal error - a core requirement in portable pH and electrochemical sensors.
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:
- Obsolete
- 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-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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