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Analog Devices Inc./Maxim Integrated MAX4239ASA+T
- Part No.:
- MAX4239ASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4239ASA+T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,476
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Product details
Overview
MAX4239ASA+T from Maxim Integrated is a decompensated, ultra-high-precision operational amplifier optimized for high-gain, low-noise sensor signal conditioning. It delivers 6.5MHz gain-bandwidth product, 10V/V minimum stable gain, 0.1µV typical input offset voltage, and rail-to-rail output swing on a single 2.7V–5.5V supply - enabling accurate amplification of microvolt-level thermocouple or strain gauge signals in industrial instrumentation.
For engineers reviewing the MAX4239ASA+T datasheet, MAX4239ASA+T pinout, MAX4239ASA+T application, or MAX4239ASA+T equivalent, this page provides verified circuit role, thermal performance data, shutdown behavior, stability constraints, and validated alternative options for precision analog front-end design.
Technical Context
The MAX4239ASA+T uses patented autocorrelating zeroing to continuously measure and cancel input offset and 1/f noise, achieving <2.5µV max offset over –40°C to +85°C and 10nV/°C drift. Its decompensated architecture requires closed-loop gain ≥10V/V for stability, distinguishing it from the unity-gain-stable MAX4238.
It features ground-sensing inputs, rail-to-rail output (35mV headroom at 1kΩ load), active-low shutdown (0.1µA quiescent), and operates across –40°C to +125°C. Electrical specifications are guaranteed over temperature with 125dB open-loop gain and 140dB CMRR/PSRR at +25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 6.5MHz - enables stable 100× amplification up to ~65kHz for high-resolution ADC buffering |
| Min Stable Closed-Loop Gain | 10V/V - mandates external gain-setting network ≥10×; violates stability if configured for unity gain |
| Input Offset Voltage (max) | 2.5µV (–40°C to +85°C) - supports 16-bit accuracy in 13mV full-scale systems without calibration |
| Supply Current | 600µA (typ) - allows battery-powered portable instrumentation with >1-year runtime on coin cell |
| Output Voltage Swing | Rail-to-rail, ±35mV headroom at 1kΩ - preserves dynamic range when driving SAR ADCs directly |
| Shutdown Current | 0.1µA - reduces system standby power by >99.9% during idle periods |
| Input Noise (0.01–10Hz) | 1.5µVP-P - critical for DC-coupled thermocouple amplification below 10Hz |
Pinout & Package
MAX4239ASA+T is packaged in an 8-pin narrow SO (SO-8) with exposed pad not present. Thermal resistance is θJA = 132°C/W (multi-layer board), supporting continuous operation at ambient up to +70°C with no derating.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N.C. | No internal connection; must be left floating or tied to GND per layout best practice |
| 2 | OUT | Amplifier output; drives loads down to 1kΩ with rail-to-rail swing and 40mA short-circuit capability |
| 3 | IN+ | Noninverting input; ground-sensing - accepts common-mode voltages down to –0.1V (below GND) |
| 4 | IN− | Inverting input; matched to IN+ for <140dB CMRR; sensitive to PCB leakage and guard ring layout |
| 5 | SHDN | Active-low shutdown control; pulls output to high-Z and stops internal clock when ≤0.7V |
| 6 | VCC | Positive supply; accepts 2.7V–5.5V; PSRR = 140dB ensures immunity to digital supply noise |
| 7 | N.C. | No internal connection; electrically isolated; may be used as thermal relief pad |
| 8 | GND | Analog ground reference; must be star-connected to minimize ground bounce in mixed-signal systems |
Key Features
| Feature | Design Value |
|---|---|
| Autocorrelating Zeroing Architecture | Eliminates 1/f noise and long-term drift - removes need for system-level offset recalibration over time/temperature |
| Rail-to-Rail Output Stage | Delivers full 0V to VCC swing into 1kΩ - maximizes ADC utilization without level-shifting circuitry |
| Ground-Sensing Input Range | Accepts VCM down to –0.1V - enables direct interface to transducers referenced below GND (e.g., bridge sensors) |
| Low 10nV/°C Offset Drift | Ensures <100nV drift over 10°C ambient change - maintains 16-bit linearity without thermal compensation |
| EMI Immunity (EMIRR) | 120dB at 100MHz - suppresses RF rectification errors in noisy industrial environments |
Applications
| Thermocouple Measurement | Strain Gauge Signal Conditioning |
|---|---|
|
Use Scenario: Amplifying µV-level Seebeck voltage from K-type thermocouples across –40°C to +125°C ambient. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier stage with sub-µV offset and near-zero drift. Use Value: Enables direct 16-bit digitization without cold-junction compensation hardware or software offset correction. |
Use Scenario: Conditioning mV-output Wheatstone bridge signals from metal foil strain gauges in load cells. IC Role / Device Role / Timing Role: Low-noise, high-common-mode-rejection buffer before 24-bit delta-sigma ADC. Use Value: Achieves <0.01% nonlinearity error over temperature due to 2.5µV max offset and 10nV/°C drift. |
| Medical ECG Front-End | Automotive Pressure Sensor Interface |
|
Use Scenario: Amplifying 0.1–5mV biopotential signals from dry electrodes with high electrode-skin impedance. IC Role / Device Role / Timing Role: First-stage gain block with ground-sensing inputs to handle baseline wander and motion artifacts. Use Value: 140dB CMRR rejects 50/60Hz interference; 1.5µVP-P noise ensures clean acquisition of P/QRS/T waves. |
Use Scenario: Signal conditioning for piezoresistive pressure sensors in brake fluid or manifold applications. IC Role / Device Role / Timing Role: AEC-Q100 qualified analog front-end amplifier operating across –40°C to +125°C. Use Value: Guaranteed 3.5µV max offset at +125°C ensures stable calibration over full automotive temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8628ARZ | Unity-gain stable, 2.5MHz GBWP, 1µV max offset (–40°C to +125°C), no shutdown pin | Suitable for lower-bandwidth, unity-gain configurations where MAX4239ASA+T's 10V/V min gain is prohibitive | Select AD8628ARZ when gain <10V/V is required or shutdown functionality is unnecessary |
| LTC2057HMS8#PBF | Zero-drift, 3MHz GBWP, 5µV max offset (–40°C to +125°C), rail-to-rail output, shutdown available | Higher offset and lower bandwidth limit resolution in 16-bit+ systems above 10kHz | Choose LTC2057HMS8#PBF only if SO-8 footprint compatibility is mandatory and 5µV offset is acceptable |
Compared with AD8628ARZ and LTC2057HMS8#PBF, the MAX4239ASA+T uniquely combines 6.5MHz bandwidth, 10V/V minimum gain stability, and 2.5µV max offset over extended temperature - making it optimal for high-accuracy, medium-speed sensor interfaces where gain ≥10× is architecturally feasible.
Availability
MAX4239ASA+T is available at Aetrix Electronics and suitable for thermocouple measurement, strain gauge signal conditioning, medical ECG front-ends, automotive pressure sensor interfaces, and precision instrumentation requiring stable component supply across industrial and automotive temperature ranges.
Supply support for MAX4239ASA+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.
The MAX4238/MAX4239 family targets ultra-high-precision DC signal conditioning - specifically engineered for µV-level sensor outputs in harsh thermal environments where offset drift and 1/f noise degrade measurement fidelity.
FAQ
What is the minimum stable gain for MAX4239ASA+T, and why is it required?
The MAX4239ASA+T requires a minimum closed-loop gain of 10V/V for stability due to its decompensated internal architecture. This design trades unity-gain capability for higher gain-bandwidth (6.5MHz). Configuring the MAX4239ASA+T at gains below 10V/V risks oscillation or excessive overshoot. The MAX4238ASA+T variant is unity-gain stable but offers only 1MHz GBWP.
Does MAX4239ASA+T support rail-to-rail input common-mode voltage?
No - the MAX4239ASA+T features ground-sensing inputs, not rail-to-rail input. Its common-mode input voltage range extends from –0.1V below GND to VCC – 1.4V at +125°C. This allows interfacing with transducers biased slightly negative relative to GND (e.g., bridge sensors), but it cannot accept inputs at VCC or below –0.1V without violating absolute maximum ratings.
How does the autocorrelating zeroing technique in MAX4239ASA+T differ from chopper stabilization?
The MAX4239ASA+T uses a pseudorandom autozero clock (10–15kHz) to sample and cancel offset and 1/f noise, avoiding fixed-frequency intermodulation distortion inherent in chopper-stabilized amplifiers. Unlike choppers, it does not modulate the input signal - eliminating ripple and aliasing concerns while maintaining true DC precision and low 1.5µVP-P noise from 0.01Hz to 10Hz.
Can MAX4239ASA+T drive a 500Ω load while maintaining rail-to-rail output swing?
No - the MAX4239ASA+T specifies rail-to-rail output swing only for loads ≥1kΩ (e.g., 35mV headroom). Driving 500Ω increases output stage loading, causing increased VOL/VOH and reduced swing. For 500Ω loads, output swing degrades to approximately VCC – 100mV / 100mV, per electrical characteristics tables. Use a buffer stage or select a higher-output-current op-amp for such loads.
Is MAX4239ASA+T qualified for automotive applications?
The base MAX4239ASA+T is not AEC-Q100 qualified. However, the automotive-grade variant MAX4239AUT/V+T (SOT23-6) and MAX4239ATT/V+T (TDFN-6) are explicitly qualified per AEC-Q100 Rev H. These variants share identical electrical specs but undergo additional stress testing and lot traceability - required for under-hood or safety-critical vehicle subsystems.
MAX4239ASA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Single Ended, Rail-to-Rail
- Slew Rate:
- 1.6V/µs
- Gain Bandwidth Product:
- 6.5 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:
- 8-SOIC
MAX4239ASA+T FAQ
1.How can I place an order for MAX4239ASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4239ASA+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 MAX4239ASA+T reliable?
The price and inventory of MAX4239ASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4239ASA+T is usually 5 days.
3.What payment methods are accepted for MAX4239ASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4239ASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4239ASA+T?
MAX4239ASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4239ASA+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 MAX4239ASA+T?
For technical support, including MAX4239ASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4239ASA+T requirements.
6.How does Aetrix verify that MAX4239ASA+T is sourced from the original manufacturer or authorized distributors?
All MAX4239ASA+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 MAX4239ASA+T meets industry standards.
7.What is the process for return or replacement of MAX4239ASA+T?
All MAX4239ASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4239ASA+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 MAX4239ASA+T part is unused and in its original packaging.
Return procedure for MAX4239ASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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