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Analog Devices Inc./Maxim Integrated MAX4238AUT-T
- Part No.:
- MAX4238AUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
MAX4238AUT-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:48,694
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Product details
Overview
MAX4238AUT-T 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 active-low shutdown. It operates from a single 2.7V to 5.5V supply, draws only 600µA quiescent current, and targets high-accuracy sensor signal conditioning in thermocouple and strain gauge interfaces.
For engineers reviewing the MAX4238AUT-T datasheet, MAX4238AUT-T pinout, MAX4238AUT-T application, or MAX4238AUT-T equivalent, key selection criteria include guaranteed sub-2.5µV offset over –40°C to +85°C, 1.5µVP-P (0.01Hz–10Hz) noise, ground-sensing inputs, and SOT23-6 packaging for space-constrained precision analog front-ends.
Technical Context
The MAX4238AUT-T employs patented autocorrelating zeroing architecture that continuously measures and cancels 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 at 10-bit level).
This amplifier uses BiCMOS process technology to achieve 1pA input bias current, 140dB CMRR/PSRR, and 150dB open-loop gain while supporting rail-to-rail output swing into 1kΩ loads. Its unity-gain stability and 1MHz GBWP are optimized for low-frequency, high-resolution applications such as 16-bit ADC buffering with <100nV drift over 10°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 0.1µV typ / 2.5µV max (–40°C to +85°C): enables direct measurement of µV-level sensor outputs without calibration |
| Offset Drift | 10nV/°C max: contributes ≤100nV error over 10°C ambient shift-critical for uncalibrated industrial temperature ranges |
| Gain-Bandwidth Product | 1MHz: supports stable unity-gain operation with sufficient phase margin for precision DC-coupled gain stages |
| Supply Current | 600µA typ (VCC = 5.5V): allows battery-powered instrumentation with multi-year runtime at µA-level sleep modes |
| Shutdown Current | 0.1µA max: reduces system standby power by >99.9% while preserving high-Z output state |
| Input Noise (0.01–10Hz) | 1.5µVP-P: ensures <1 LSB error in 16-bit systems with full-scale ≤13mV when used as ADC driver |
| CMRR / PSRR | 140dB min: rejects common-mode interference from noisy digital supplies or shared ground paths in mixed-signal PCBs |
Pinout & Package
MAX4238AUT-T is packaged in a 6-pin SOT23 (U6F-6) with exposed pad (not internally connected). Pin 1 = OUT, Pin 2 = GND, Pin 3 = IN+, Pin 4 = IN−, Pin 5 = SHDN (active-low), Pin 6 = VCC. The exposed pad must be soldered to PCB ground for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier Output | Rail-to-rail capable output stage driving 1kΩ load to within 35mV of rails-supports direct interface to SAR ADC reference inputs |
| 2 (GND) | Analog Ground Reference | Primary return path for input bias currents and output load; requires low-impedance connection to system AGND plane |
| 3 (IN+) | Noninverting Input | High-impedance CMOS node (1pA bias) enabling direct connection to high-Z sensors like thermocouples without loading error |
| 4 (IN−) | Inverting Input | Differential input terminal for feedback network; sensitive to charge injection-requires matched, low-value resistors to minimize offset feedthrough |
| 5 (SHDN) | Active-Low Shutdown Control | Logic-compatible input (VIH ≥2.2V, VIL ≤0.8V) that disables internal clock and places output in high-Z state |
| 6 (VCC) | Positive Supply Rail | Accepts 2.7V–5.5V single supply; PSRR >120dB ensures immunity to supply ripple in shared-rail systems |
Key Features
| Feature | Design Value |
|---|---|
| Autocorrelating Zeroing Architecture | Eliminates 1/f noise and long-term drift without introducing chopper ripple-enables true DC precision in static measurements |
| Ground-Sensing Inputs | Common-mode range extends to VGND − 0.1V, allowing direct interface to sensors referenced to system ground (e.g., bridge transducers) |
| Rail-to-Rail Output | Swings within 35mV of supply rails into 1kΩ, maximizing dynamic range for low-voltage ADCs operating on 3.3V or lower supplies |
| Low 10nV/°C Drift | Reduces temperature-induced error to <100nV over typical industrial ambient shifts-removes need for periodic recalibration |
| EMI Immunity (EMIRR) | ≥100dB rejection up to 1GHz: prevents RF rectification errors in automotive or industrial environments with strong RF fields |
Applications
| Thermocouple Signal Conditioning | Strain Gauge Amplification |
|---|---|
Use Scenario: Amplifying µV-level Seebeck voltages from K-type thermocouples across –40°C to +125°C industrial range. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier front-end with integrated offset cancellation and 1/f noise suppression. Use Value: Delivers <2.5µV total offset error over full temperature range-enabling ±0.1°C accuracy without cold-junction compensation hardware. |
Use Scenario: Buffering mV-level differential outputs from 350Ω foil strain gauges in load-cell bridges. IC Role / Device Role / Timing Role: Low-noise, high-CMRR gain stage driving 16-bit sigma-delta ADC with minimal settling time. Use Value: 1.5µVP-P (0.01–10Hz) noise and 140dB CMRR reject bridge imbalance and EMI-achieving <0.01% linearity in electronic scales. |
| Medical Sensor Front-End | High-Accuracy Electronic Scale |
Use Scenario: Conditioning biopotential signals (e.g., ECG lead-off detection) where DC stability and low 1/f noise are critical. IC Role / Device Role / Timing Role: Ultra-stable DC amplifier with shutdown control for power-gated patient monitoring modules. Use Value: 0.1µV typical offset and 0.1µA shutdown current extend battery life while maintaining baseline integrity during sleep cycles. |
Use Scenario: Amplifying microvolt outputs from precision load cells in legal-for-trade weighing systems requiring NTEP certification. IC Role / Device Role / Timing Role: Primary gain stage in 24-bit ADC signal chain with guaranteed 3.5µV max offset over –40°C to +125°C. Use Value: Meets OIML R76 Class III requirements for repeatability and temperature drift without factory calibration per unit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8628ARTZ-REEL7 | Chopper-stabilized; 1µV max offset (–40°C to +125°C); 2.5MHz GBWP; no shutdown pin | Lacks active shutdown and has higher 1/f noise energy due to fixed 100kHz chopping frequency | Select when higher bandwidth is required and system-level power management handles sleep mode externally |
| LTC2057HS5#TRMPBF | Zero-drift architecture; 3µV max offset (–40°C to +125°C); 2MHz GBWP; shutdown available but consumes 1.5µA in shutdown | Higher shutdown current and wider offset spec reduce suitability for ultra-low-power, high-accuracy portable instruments | Select when robustness to ESD (>4kV HBM) and wider supply range (2.7V–12V) outweigh sub-µA shutdown needs |
Compared with AD8628ARTZ-REEL7 and LTC2057HS5#TRMPBF, the MAX4238AUT-T offers the lowest guaranteed offset (2.5µV max over –40°C to +85°C), lowest shutdown current (0.1µA), and integrated pseudorandom autozeroing that avoids chopper-related intermodulation-making it optimal for battery-powered, high-resolution DC measurement systems.
Availability
MAX4238AUT-T is available at Aetrix Electronics and suitable for thermocouple interfaces, strain gauge amplifiers, medical sensor front-ends, electronic scales, and instrumentation amplifier designs requiring stable component supply with guaranteed long-term parametric consistency.
Supply support for MAX4238AUT-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 high-performance analog and mixed-signal ICs for precision, power, and interface applications across industrial, automotive, and medical markets.
The MAX4238/MAX4239 family was engineered specifically for ultra-high-precision DC signal conditioning-targeting applications where traditional op-amps fail due to 1/f noise, thermal drift, or offset instability over time and temperature.
FAQ
What is the maximum operating temperature range for the MAX4238AUT-T?
The MAX4238AUT-T is fully specified over an operating temperature range of –40°C to +125°C. Electrical parameters including input offset voltage (3.5µV max), offset drift (10nV/°C), and supply current (900µA max) are guaranteed across this full range, making it suitable for under-hood automotive and industrial control environments where thermal stress is severe.
Does the MAX4238AUT-T require external capacitors for stability in unity-gain configuration?
No, the MAX4238AUT-T is unity-gain stable and does not require external compensation capacitors. Its internal compensation ensures ≥60° phase margin with 10kΩ load and 100pF capacitive load, as verified in the datasheet's gain/phase plots. However, layout best practices-such as short traces, local bypassing (0.1µF ceramic), and grounding the exposed pad-are essential to maintain stability in noisy systems.
How does the MAX4238AUT-T handle output overload recovery?
The MAX4238AUT-T recovers from output saturation in just 3.3ms (to 0.1% of final value at AV = 10), significantly faster than most autozero amplifiers. This rapid recovery is achieved through optimized null amplifier dynamics and is validated across –40°C to +125°C. It ensures minimal data loss when interfacing with multiplexed sensor arrays or transient-prone industrial inputs.
Can the MAX4238AUT-T drive ADC inputs directly without an external buffer?
Yes-the MAX4238AUT-T's rail-to-rail output, low output impedance (<1Ω at DC), and fast settling time (1.7ms to 0.006% for 14-bit) allow direct connection to SAR and sigma-delta ADC reference or input pins. Its 1.5µVP-P (0.01–10Hz) noise and 140dB CMRR prevent code flicker and maintain effective resolution in 16-bit+ systems without additional filtering.
Is the MAX4238AUT-T pin-compatible with other members of the MAX4238/MAX4239 family?
The MAX4238AUT-T shares identical pinout with MAX4239AUT-T and all SOT23-packaged variants (e.g., MAX4238AUT/V+T), but functional differences exist: MAX4239AUT-T requires minimum gain of 10V/V and has 6.5MHz GBWP. Swapping them without circuit revision risks instability or bandwidth mismatch-always verify gain configuration and compensation before substitution.
MAX4238AUT-T 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-T FAQ
1.How can I place an order for MAX4238AUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4238AUT-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 MAX4238AUT-T reliable?
The price and inventory of MAX4238AUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4238AUT-T is usually 5 days.
3.What payment methods are accepted for MAX4238AUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4238AUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4238AUT-T?
MAX4238AUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4238AUT-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 MAX4238AUT-T?
For technical support, including MAX4238AUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4238AUT-T requirements.
6.How does Aetrix verify that MAX4238AUT-T is sourced from the original manufacturer or authorized distributors?
All MAX4238AUT-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 MAX4238AUT-T meets industry standards.
7.What is the process for return or replacement of MAX4238AUT-T?
All MAX4238AUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4238AUT-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 MAX4238AUT-T part is unused and in its original packaging.
Return procedure for MAX4238AUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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