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Analog Devices Inc./Maxim Integrated MAX4239ASA+
- Part No.:
- MAX4239ASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4239ASA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,146
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Product details
Overview
MAX4239ASA+ 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 closed-loop gain, 0.1µV typical input offset voltage, and rail-to-rail output swing on a single 2.7V–5.5V supply. It is used in precision thermocouple and strain gauge front-ends where drift and 1/f noise must be suppressed.
For engineers reviewing the MAX4239ASA+ datasheet, MAX4239ASA+ pinout, MAX4239ASA+ application, or MAX4239ASA+ equivalent, key selection criteria include guaranteed 10V/V minimum gain stability, 10nV/°C max offset drift over –40°C to +125°C, 1.5µVP-P (0.01Hz–10Hz) input noise, shutdown current of 0.1µA, and SO-8 package compatibility with industrial and automotive-grade variants.
Technical Context
The MAX4239ASA+ 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 autozero clock (10kHz–15kHz) minimizes spectral artifacts while maintaining fast overload recovery (3.3ms at 0.1% for AV = 10).
This decompensated amplifier requires ≥10V/V closed-loop gain for stability and achieves 6.5MHz GBWP with 1.6V/µs slew rate at 5V supply. It features ground-sensing inputs, rail-to-rail output driving 1kΩ loads, and active-low shutdown that places the output in high-impedance state while reducing ICC to 0.1µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 6.5MHz - enables stable operation at AV ≥ 10V/V with sufficient phase margin for precision closed-loop designs |
| Input Offset Voltage (max) | 3.5µV over –40°C to +125°C - ensures ≤1 LSB error in 16-bit systems with <13mV full-scale range |
| Offset Drift (max) | 10nV/°C - limits thermal-induced error to 100nV across 10°C ambient shift |
| Peak-to-Peak Input Noise | 1.5µVP-P, 0.01Hz–10Hz - supports high-resolution DC-coupled measurements in electronic scales and medical sensors |
| Supply Current (active) | 600µA - allows battery-powered instrumentation with >1-year runtime on coin cell when paired with shutdown mode |
| Shutdown Current | 0.1µA - enables ultra-low-power wake-on-event architectures without external power gating |
| Output Swing (RL = 1kΩ) | VOH ≥ VCC – 50mV, VOL ≤ 50mV - provides full dynamic range into ADC drivers and low-voltage reference buffers |
| CMRR / PSRR (min) | 90dB / 120dB over –40°C to +125°C - rejects common-mode interference and supply ripple in noisy industrial environments |
Pinout & Package
MAX4239ASA+ is housed in an 8-pin narrow SO (SO-8) package with exposed pad not present. Thermal resistance is θJA = 132°C/W (multi-layer board), supporting continuous operation up to +125°C ambient.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N.C. | No internal connection; must remain unconnected or grounded per layout guidelines |
| 2 | OUT | Amplifier output; rail-to-rail capable into 1kΩ load; high-impedance during SHDN |
| 3 | IN+ | Noninverting input; ground-sensing; high-impedance CMOS node (1pA bias current) |
| 4 | IN− | Inverting input; matched to IN+ for optimal CMRR; sensitive to charge injection from feedback network |
| 5 | SHDN | Active-low shutdown control; logic-low (<0.7V) disables amplifier and reduces ICC to 0.1µA |
| 6 | VCC | Positive supply rail; operates from 2.7V to 5.5V; PSRR ≥120dB suppresses supply noise |
| 7 | N.C. | No internal connection; must remain unconnected or grounded per layout guidelines |
| 8 | GND | Analog ground reference; separate return path required for optimal noise performance |
Key Features
| Feature | Design Value |
|---|---|
| Autocorrelating Zeroing Architecture | Eliminates 1/f noise and long-term drift without chopper ripple; enables true DC precision in strain gauge bridges |
| Rail-to-Rail Output Stage | Delivers full 0–VCC swing into 1kΩ, preserving ADC effective resolution without level-shifting circuitry |
| Ground-Sensing Inputs | Accepts common-mode voltages down to –0.05V, enabling direct interface with single-supply bridge transducers |
| Low-Power Shutdown Mode | Reduces quiescent current to 0.1µA while placing output in high-Z state-ideal for intermittent-sampling data loggers |
| AEC-Q100 Qualified Variant Available | MAX4239AUT/V+ meets automotive temperature and reliability requirements for under-hood sensor signal chains |
| High Open-Loop Gain | 125dB min (–40°C to +85°C) ensures <0.001% gain error in 100× instrumentation amplifier configurations |
Applications
| Thermocouple Signal Conditioning | Strain Gauge Bridge Amplification |
|---|---|
|
Use Scenario: Cold-junction compensation and µV-level thermocouple output amplification in industrial process controllers. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with near-zero drift, rejecting thermal EMF errors over wide ambient ranges. Use Value: 3.5µV max offset over –40°C to +125°C ensures <±0.5°C measurement uncertainty in Type-K thermocouples without recalibration. |
Use Scenario: Amplifying mV-level differential outputs from 350Ω foil strain gauges in load cells and pressure sensors. IC Role / Device Role / Timing Role: Low-noise, ground-sensing instrumentation amplifier front-end with 1.5µVP-P (0.01Hz–10Hz) noise floor. Use Value: Enables 24-bit resolution in weigh-scale systems by limiting noise contribution to <1 LSB at 10Hz bandwidth. |
| Medical ECG Front-End | Automotive Battery Monitoring |
|
Use Scenario: Buffering and filtering microvolt-level biopotential signals in portable ECG monitors with single-supply operation. IC Role / Device Role / Timing Role: Ultra-low-drift, low-noise op-amp in right-leg drive and lead-off detection circuits requiring DC accuracy. Use Value: 10nV/°C drift prevents baseline wander during 30-minute clinical recordings across room-temperature variations. |
Use Scenario: High-side current sensing and cell-voltage monitoring in 12V automotive battery management systems. IC Role / Device Role / Timing Role: Precision difference amplifier with 140dB CMRR rejecting ignition noise and alternator ripple. Use Value: AEC-Q100 qualified variants (e.g., MAX4239AUT/V+) support ASIL-B functional safety requirements for voltage accuracy ±1mV. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA189IDBVR | Zero-drift, 1.4MHz GBWP, 0.005µV/°C drift, but unity-gain stable and higher supply current (1.3mA) | Better drift spec but lower bandwidth; suited for low-speed, ultra-stable references-not high-gain sensor interfaces | Select OPA189IDBVR only if drift <0.01µV/°C is mandatory and gain ≤5V/V suffices |
| LTC2057HMS8#PBF | Chopper-stabilized, 2MHz GBWP, 0.5µV max offset, 0.01µV/°C drift, but 100nVP-P noise (0.1–10Hz) | Lower noise than choppers but higher than MAX4239; exhibits switching artifacts unsuitable for audio or RF-adjacent paths | Choose LTC2057HMS8#PBF for sub-1µV offset-critical biasing, not for low-noise analog front-ends |
Compared with OPA189IDBVR and LTC2057HMS8#PBF, the MAX4239ASA+ uniquely balances 6.5MHz bandwidth, 10V/V minimum gain stability, and 1.5µVP-P ultra-low-frequency noise-making it the only option among the three qualified for high-gain, low-drift, low-noise industrial sensor buffering without external compensation.
Availability
MAX4239ASA+ is available at Aetrix Electronics and suitable for thermocouple interfaces, strain gauge amplifiers, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4239ASA+ 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 in industrial, medical, and automotive markets.
The MAX4238/MAX4239 product line targets ultra-high-precision DC signal conditioning-specifically engineered to replace legacy chopper amplifiers in sensor front-ends where 1/f noise, drift, and gain stability are critical.
FAQ
What is the minimum stable gain for MAX4239ASA+?
The MAX4239ASA+ is decompensated and requires a minimum closed-loop gain of 10V/V for stability. Operating below this gain risks oscillation or excessive overshoot. This is confirmed in the Electrical Characteristics table and Applications Information section of the datasheet, where phase margin is specified at 60° only for AV ≥ 10V/V. The MAX4239ASA+ is not unity-gain stable like the MAX4238ASA+.
Does MAX4239ASA+ support rail-to-rail input operation?
No, MAX4239ASA+ does not support rail-to-rail input. Its common-mode input voltage range is specified as VGND – 0.05V to VCC – 1.4V (over –40°C to +125°C), meaning it is ground-sensing but cannot accept inputs at the positive rail. This design enables high CMRR and low input bias current (1pA), making it ideal for single-supply sensor interfaces where the negative input is near ground.
Can MAX4239ASA+ be used in automotive applications?
Yes-while the MAX4239ASA+ itself is not automotive-qualified, the pin-compatible MAX4239AUT/V+ variant is AEC-Q100 qualified for automotive use and shares identical electrical specifications. The MAX4239ASA+ is offered in SO-8 packaging suitable for industrial and test equipment; for automotive deployment, engineers should select the /V suffix version with validated qualification documentation.
What is the overload recovery time of MAX4239ASA+?
The MAX4239ASA+ recovers from output saturation in 3.3ms to 0.1% accuracy (10-bit level) when configured with AV = 10V/V, as measured per the Electrical Characteristics table. This fast recovery is enabled by its proprietary autozero architecture and is significantly better than conventional zero-drift amplifiers, which often require tens of milliseconds to settle after overload.
How does the shutdown mode affect the output state of MAX4239ASA+?
When SHDN is pulled low, the MAX4239ASA+ enters shutdown mode: the internal autozero clock stops, supply current drops to 0.1µA, and the output transitions to a high-impedance (Hi-Z) state-neither sourcing nor sinking current. This behavior is explicitly documented in the Shutdown section and Electrical Characteristics table, ensuring safe isolation in multiplexed or shared-bus signal chains.
MAX4239ASA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- -
- 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+ FAQ
1.How can I place an order for MAX4239ASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4239ASA+ 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+ reliable?
The price and inventory of MAX4239ASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4239ASA+ is usually 5 days.
3.What payment methods are accepted for MAX4239ASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4239ASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4239ASA+?
MAX4239ASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4239ASA+ 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+?
For technical support, including MAX4239ASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4239ASA+ requirements.
6.How does Aetrix verify that MAX4239ASA+ is sourced from the original manufacturer or authorized distributors?
All MAX4239ASA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX4239ASA+?
All MAX4239ASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4239ASA+, 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+ part is unused and in its original packaging.
Return procedure for MAX4239ASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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