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Analog Devices Inc./Maxim Integrated MAX4238AUT
- Part No.:
- MAX4238AUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
MAX4238AUT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:424
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Product details
Overview
MAX4238AUT from Maxim Integrated is a unity-gain stable, ultra-high-precision operational amplifier featuring 0.1µV typical input offset voltage, 10nV/°C max drift, 1MHz gain-bandwidth product, rail-to-rail output, and 600µA supply current. It operates from a single 2.7V to 5.5V supply and is specified over the full automotive temperature range (−40°C to +125°C), making it ideal for thermocouple signal conditioning in industrial sensor interfaces.
For engineers reviewing the MAX4238AUT datasheet, MAX4238AUT pinout, MAX4238AUT application, or MAX4238AUT equivalent, key selection criteria include its guaranteed 2.5µV max offset over −40°C to +85°C, 1.5µVP-P (DC–10Hz) low-frequency noise, shutdown current of 0.1µA, ground-sensing input architecture, and SOT23-6 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX4238AUT employs Maxim's patented autocorrelating zeroing technique to continuously measure and cancel input offset and 1/f noise-enabling near-zero DC error without chopper-induced intermodulation distortion. Its pseudorandom clock (10kHz–15kHz) minimizes spectral artifacts while maintaining fast overload recovery (3.3ms).
This amplifier is optimized for precision DC-coupled applications requiring high CMRR (140dB), PSRR (140dB), and AVOL (150dB) at unity gain. Its ground-sensing input allows direct interfacing with low-side current shunts or bridge sensors referenced to system ground, and its rail-to-rail output delivers full dynamic range into 1kΩ loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 0.1µV typ / 2.5µV max (−40°C to +85°C): enables sub-16-bit accuracy in 10mV-scale sensor outputs without calibration. |
| Offset Drift | 10nV/°C max: contributes ≤100nV error over 10°C ambient shift-critical for uncalibrated medical or test equipment. |
| Gain-Bandwidth Product | 1MHz: supports stable unity-gain operation with ≤3.3ms settling to 0.0015% for 16-bit ADC buffering. |
| Supply Current | 600µA typ (5.5V): allows battery-powered instrumentation with >1-year runtime on coin cells when paired with shutdown mode. |
| Output Swing | Rail-to-rail into 1kΩ: delivers full 0–5.5V output range from single supply, maximizing SNR in low-voltage data acquisition systems. |
| Shutdown Current | 0.1µA max: reduces system standby power by >99.9% versus active mode-essential for always-on sensor nodes. |
| CMRR / PSRR | 140dB each: rejects common-mode noise from shared grounds and supply ripple in noisy industrial environments. |
Pinout & Package
MAX4238AUT is housed in a RoHS-compliant, lead-free-compatible 6-pin SOT23 package (pkg code U6F-6), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. The exposed die pad is not internally connected and may be left floating or grounded per layout requirements.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output terminal; rail-to-rail capable into 1kΩ load; high-impedance during shutdown. |
| 2 | GND | Analog ground reference; must be low-impedance connection to minimize noise coupling and offset errors. |
| 3 | IN+ | Noninverting input; ground-sensing architecture allows direct connection to low-side shunt resistors or bridge legs. |
| 4 | IN− | Inverting input; matched to IN+ for optimal CMRR; sensitive to PCB leakage-requires guard ring in high-impedance designs. |
| 5 | SHDN | Active-low shutdown control; logic-low (≤0.7V) disables amplifier and reduces ICC to 0.1µA; tie to VCC for normal operation. |
| 6 | VCC | Positive supply input; accepts 2.7V–5.5V single supply; decoupling capacitor (0.1µF) required within 1mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Autocorrelating Zeroing Architecture | Eliminates 1/f noise and long-term drift without chopper artifacts-enables true DC precision in thermocouple amplifiers. |
| Ground-Sensing Input Stage | Allows direct interface with sensors referenced to system ground (e.g., strain gauges, current shunts), simplifying biasing networks. |
| Rail-to-Rail Output | Delivers full 0V to VCC swing into 1kΩ, preserving dynamic range in low-voltage microcontroller-based data loggers. |
| 0.1µA Shutdown Mode | Reduces quiescent current by 6000×, enabling energy harvesting or battery-backed operation in intermittent-sampling systems. |
| Specified Over −40°C to +125°C | Guarantees performance across automotive under-hood, industrial motor control, and outdoor environmental monitoring deployments. |
Applications
| Thermocouple Amplification | Strain Gauge Signal Conditioning |
|---|---|
|
Use Scenario: Amplifying µV-level Seebeck voltages from Type-K thermocouples in furnace controllers with no cold-junction compensation hardware. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier front-end with ground-referenced input and rail-to-rail output driving 16-bit SAR ADCs. Use Value: 2.5µV max offset ensures <0.1°C measurement error over −40°C to +85°C ambient-eliminating software calibration in cost-sensitive industrial thermostats. |
Use Scenario: Buffering mV-output Wheatstone bridge signals from load cells in electronic scales with 0.005% linearity requirement. IC Role / Device Role / Timing Role: Low-noise, low-drift gain stage with 1.5µVP-P (DC–10Hz) noise floor and 10nV/°C drift for high-resolution weight digitization. Use Value: Near-zero drift enables 24-hour zero-stability without recalibration-meeting OIML R76 Class III metrology standards for commercial weighing systems. |
| Medical ECG Front-End | High-Accuracy ADC Driver |
|
Use Scenario: Amplifying 0.5–5mV biopotential signals from dry-electrode ECG sensors in portable patient monitors. IC Role / Device Role / Timing Role: First-stage gain block with 140dB CMRR to reject 50/60Hz mains interference and 150dB open-loop gain for precise gain setting. Use Value: 140dB PSRR suppresses supply ripple from switching regulators, enabling clean analog front-end operation from shared digital power rails. |
Use Scenario: Driving the input of 16-bit successive-approximation ADCs in automated test equipment requiring <1LSB integral nonlinearity. IC Role / Device Role / Timing Role: Unity-gain buffer with 3.3ms 0.0015% settling time and 1MHz GBWP to maintain full-scale accuracy during rapid channel scanning. Use Value: Guaranteed 1MHz bandwidth and 150dB AVOL ensure minimal gain error (<0.001%) and distortion-free sampling at 100kSPS rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Chopper-stabilized; 10µV max offset (−40°C to +125°C); 350kHz GBWP; 17µA supply current. | Lacks ground-sensing input; higher offset and drift limit use in sub-100nV-error systems. | Select when ultra-low power (not ultra-low offset) is primary; avoid where ground-referenced sensor interface is required. |
| LTC2050CS5#TRMPBF | Zero-drift architecture; 1.5µV max offset (−40°C to +125°C); 3MHz GBWP; 1.1mA supply current. | Higher supply current and larger SOT23-5 footprint; no shutdown pin. | Choose for higher bandwidth needs (>1MHz) where board space and power budget allow; verify layout compatibility with missing SHDN function. |
Compared with OPA333AIDBVR and LTC2050CS5#TRMPBF, the MAX4238AUT provides the lowest guaranteed offset (2.5µV max) and integrated shutdown in a standard SOT23-6, making it uniquely suited for ground-referenced, battery-conscious, high-accuracy sensor front-ends demanding long-term stability without calibration.
Availability
MAX4238AUT is available at Aetrix Electronics and suitable for thermocouple amplification, strain gauge signal conditioning, medical ECG front-ends, high-accuracy ADC driver circuits, and industrial sensor interfaces requiring stable component supply across extended temperature ranges.
Supply support for MAX4238AUT 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, automotive, and communications markets.
The MAX4238AUT belongs to Maxim's ultra-precision op-amp product line, engineered specifically for DC-coupled, low-drift sensor signal chains where offset, drift, and 1/f noise dominate system error budgets.
FAQ
What is the maximum operating temperature range for the MAX4238AUT?
The MAX4238AUT is fully specified and guaranteed over the industrial and automotive temperature range of −40°C to +125°C. All key parameters-including input offset voltage (2.5µV max), offset drift (10nV/°C), CMRR (90dB min), and supply current (900µA max)-are tested or guaranteed across this full range, enabling reliable deployment in engine control units and industrial PLCs.
Does the MAX4238AUT require external capacitors for stability in unity-gain configuration?
No, the MAX4238AUT is unity-gain stable by design and does not require external compensation capacitors. Its internal compensation ensures ≥60° phase margin with 10kΩ load and 100pF capacitance, as verified in the datasheet's gain/phase plots. However, a 0.1µF ceramic decoupling capacitor is mandatory between VCC and GND, placed within 1mm of the pins.
How does the MAX4238AUT achieve 0.1µV typical offset voltage?
The MAX4238AUT achieves 0.1µV typical offset via Maxim's patented autocorrelating zeroing technique-a continuous, non-chopping method that samples and cancels input-stage offset and 1/f noise using a pseudorandom clock (10–15kHz). This avoids intermodulation distortion while delivering true DC precision unmatched by conventional chopper or autozero amplifiers.
Can the MAX4238AUT drive a 10kΩ load with rail-to-rail output swing?
Yes-the MAX4238AUT delivers rail-to-rail output swing into 10kΩ loads, with VOH = VCC − 20mV and VOL = 20mV (max) at TA = −40°C to +125°C. For 1kΩ loads, swing degrades slightly to VCC − 100mV / 100mV, but remains fully functional for driving ADC references or low-impedance analog buses.
Is the exposed pad on the MAX4238AUT's SOT23 package electrically connected?
No-the exposed pad on the MAX4238AUT (package code U6F-6) is not internally connected to any die node. It may be left unconnected, tied to GND for thermal improvement, or floated based on mechanical or thermal requirements-no electrical impact results from any choice.
MAX4238AUT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Single Ended, Rail-to-Rail
- Slew Rate:
- 0.35V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 0.1 µV
- Current - Supply:
- 600µA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX4238AUT FAQ
1.How can I place an order for MAX4238AUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4238AUT 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 MAX4238AUT reliable?
The price and inventory of MAX4238AUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4238AUT is usually 5 days.
3.What payment methods are accepted for MAX4238AUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4238AUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4238AUT?
MAX4238AUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4238AUT 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 MAX4238AUT?
For technical support, including MAX4238AUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4238AUT requirements.
6.How does Aetrix verify that MAX4238AUT is sourced from the original manufacturer or authorized distributors?
All MAX4238AUT 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 MAX4238AUT meets industry standards.
7.What is the process for return or replacement of MAX4238AUT?
All MAX4238AUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX4238AUT, 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 MAX4238AUT part is unused and in its original packaging.
Return procedure for MAX4238AUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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