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Analog Devices Inc./Maxim Integrated MAX4238ASA-T
- Part No.:
- MAX4238ASA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4238ASA-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,151
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Product details
Overview
MAX4238ASA-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 over –40°C to +125°C, 1MHz gain-bandwidth product, rail-to-rail output swing, and active-low shutdown consuming only 0.1µA. It operates from a single 2.7V to 5.5V supply and targets high-accuracy sensor signal conditioning in thermocouple and strain gauge interfaces.
For engineers reviewing the MAX4238ASA-T datasheet, MAX4238ASA-T pinout, MAX4238ASA-T application, or MAX4238ASA-T equivalent, key selection criteria include guaranteed ≤2.5µV offset over –40°C to +85°C, 1.5µVP-P (0.01Hz–10Hz) low-frequency noise, 150dB open-loop gain, 140dB PSRR/CMRR, and SO-8 package compatibility with industrial and automotive-grade variants.
Technical Context
The MAX4238ASA-T employs patented autocorrelating zeroing architecture that continuously samples 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 AV = 10).
This amplifier is internally compensated for unity-gain stability, supports ground-sensing inputs, delivers rail-to-rail output into 1kΩ loads, and integrates an active-low SHDN pin that places the output in high-impedance state while reducing ICC to 0.1µA-making it suitable for battery-powered precision measurement systems requiring intermittent operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 0.1µV typ, ≤2.5µV max over –40°C to +85°C - enables sub-16-bit ADC accuracy without calibration |
| Offset Drift | 10nV/°C max - ensures <100nV drift over 10°C ambient change, critical for uncalibrated industrial sensors |
| Gain-Bandwidth Product | 1MHz - supports stable unity-gain buffering of low-frequency sensor signals up to ~100kHz |
| Supply Current | 600µA typ at 5.5V - allows integration into low-power data loggers without thermal derating concerns |
| Shutdown Current | 0.1µA max - extends battery life in duty-cycled instrumentation with >10-year standby capability |
| Output Swing | Rail-to-rail into 1kΩ - delivers full dynamic range to ADCs with 2.7V–5.5V supplies, minimizing headroom loss |
| PSRR / CMRR | 140dB min - rejects power supply ripple and common-mode interference in noisy industrial environments |
Pinout & Package
MAX4238ASA-T is housed in an 8-pin narrow SO (SO-8) package with exposed pad not present. Pin 1 is OUT; Pin 2 is GND; Pin 3 is IN+; Pin 4 is IN−; Pin 5 is SHDN; Pin 6 is VCC; Pins 5 and 8 are No Connect (N.C.). The exposed pad is absent in SO-8 variant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output terminal; rail-to-rail capable into 1kΩ load; high-impedance during SHDN |
| 2 | GND | Analog ground reference; must be low-impedance connection to minimize offset error coupling |
| 3 | IN+ | Noninverting input; ground-sensing capability allows direct interface to low-side shunt or bridge sensors |
| 4 | IN− | Inverting input; matched to IN+ for optimal CMRR; sensitive to PCB leakage and layout parasitics |
| 5 | SHDN | Active-low shutdown control; logic-low (<0.7V) disables amplifier and reduces ICC to 0.1µA |
| 6 | VCC | Positive supply input; accepts 2.7V–5.5V; decoupling capacitor required within 1cm of pin |
| 7, 8 | N.C. | No internal connection; must remain unconnected or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Autocorrelating Zeroing Architecture | Eliminates 1/f noise and long-term drift without chopper ripple, enabling true DC precision in static measurements |
| Rail-to-Rail Output Stage | Delivers full 2.7V–5.5V output swing into 1kΩ, maximizing ADC utilization and eliminating level-shifting circuitry |
| Ground-Sensing Input | Accepts common-mode voltages down to –0.05V, supporting direct connection to low-side current-sense resistors |
| Low 1.5µVP-P (0.01Hz–10Hz) Noise | Enables resolution of microvolt-level thermocouple outputs without external filtering or oversampling |
| 150dB Open-Loop Gain (AVOL) | Ensures <0.001% gain error at AV = 100, critical for high-accuracy instrumentation amplifier front-ends |
Applications
| Thermocouple Signal Conditioning | Strain Gauge Bridge Amplification |
|---|---|
|
Use Scenario: Amplifying µV-level Seebeck voltage from Type-K thermocouples across –40°C to +125°C industrial environments. IC Role / Device Role / Timing Role: Precision DC-coupled buffer with near-zero drift, rejecting EMI via 140dB CMRR and delivering rail-to-rail output to 16-bit SAR ADC. Use Value: Eliminates cold-junction compensation drift errors and enables ±0.1°C temperature accuracy without system-level calibration. |
Use Scenario: Conditioning mV-level differential output from 350Ω foil strain gauges in load cells and pressure transducers. IC Role / Device Role / Timing Role: Low-noise, ground-sensing instrumentation front-end with 0.1µV offset, driving ADC with 1.5µVP-P noise floor. Use Value: Achieves 24-bit effective resolution in weigh-scale systems by suppressing 1/f noise and thermal EMF-induced offset drift. |
| Medical Patient Monitoring | Automotive Battery Cell Voltage Sensing |
|
Use Scenario: Amplifying ECG electrode potentials (0.5–5mV) in portable patient monitors with strict power budget constraints. IC Role / Device Role / Timing Role: Ultra-low-power, low-drift op-amp operating from 3.3V supply, using SHDN to gate amplification between sampling intervals. Use Value: Extends battery life beyond 7 days while maintaining diagnostic-grade baseline stability and noise performance. |
Use Scenario: Measuring individual Li-ion cell voltages (0–4.2V) in BMS modules where offset drift directly impacts SoC estimation accuracy. IC Role / Device Role / Timing Role: High-PSRR (140dB), rail-to-rail input/output amplifier referenced to battery stack ground, immune to supply ripple. Use Value: Reduces cell voltage measurement error to <0.5mV over temperature, improving state-of-charge accuracy by ≥1.2%. |
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 | Chopper-stabilized; 1µV max offset at +25°C; higher 1/f noise (0.12µVP-P); no shutdown pin | Lacks active shutdown; less suitable for intermittent-sampling systems requiring µA-level sleep current | Prefer MAX4238ASA-T when 0.1µV typ offset, 0.1µA shutdown, and autocorrelation-based noise cancellation are required |
| LTC2057HS8#PBF | Zero-drift architecture; 0.25µV max offset at +25°C; 1.8µVP-P noise; 1.2MHz GBWP; shutdown available | Higher noise and wider offset spec limit resolution in sub-16-bit sensor channels | Choose MAX4238ASA-T for tighter offset distribution (≤2.5µV over temp) and lower 0.01Hz–10Hz noise in critical DC applications |
Compared with AD8628ARZ and LTC2057HS8#PBF, the MAX4238ASA-T delivers superior offset stability over temperature, lower low-frequency noise, and integrated shutdown-making it optimal for battery-powered, high-resolution sensor front-ends demanding long-term DC accuracy without recalibration.
Availability
MAX4238ASA-T is available at Aetrix Electronics and suitable for thermocouple interfaces, strain gauge amplifiers, and medical instrumentation requiring stable component supply, AEC-Q100-compliant variants, and long-lifecycle support.
Supply support for MAX4238ASA-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 series belongs to Maxim's ultra-precision op-amp product line, engineered specifically for DC-critical sensor signal chains where offset drift, 1/f noise, and long-term stability dominate system error budgets.
FAQ
What is the maximum operating temperature range for the MAX4238ASA-T?
The MAX4238ASA-T is fully specified over –40°C to +125°C. Its input offset voltage remains ≤3.5µV across this full range, and its 140dB PSRR/CMRR are guaranteed at –40°C to +85°C. This makes MAX4238ASA-T suitable for under-hood automotive and industrial control applications where ambient temperatures exceed 105°C.
Does the MAX4238ASA-T require external compensation components?
No, the MAX4238ASA-T is unity-gain stable and requires no external compensation. Its internal compensation ensures phase margin ≥60° at AV = 1V/V with 100pF capacitive load. Unlike the decompensated MAX4239, MAX4238ASA-T can be used directly as a buffer or in any gain configuration from 1V/V to 1000V/V without added resistors or capacitors.
How does the autocorrelating zeroing technique in the MAX4238ASA-T differ from conventional chopper stabilization?
The MAX4238ASA-T uses a pseudorandom clock (10kHz–15kHz) to sample and cancel offset, avoiding fixed-frequency chopper tones that cause intermodulation distortion. This autocorrelation method eliminates 1/f noise as a slow-varying offset rather than modulating it-resulting in cleaner DC performance and lower 0.01Hz–10Hz noise (1.5µVP-P) compared to chopper amplifiers like AD8628.
Can the MAX4238ASA-T drive a 10kΩ load rail-to-rail?
Yes-the MAX4238ASA-T delivers rail-to-rail output swing into 10kΩ loads, with VOH ≤ VCC – 4mV and VOL ≤ 4mV at TA = +25°C. At heavier 1kΩ loads, output swing degrades to VCC – 35mV/35mV, still preserving >98% of supply range. This capability simplifies interface to SAR and sigma-delta ADCs without external level-shifting.
Is the MAX4238ASA-T pin-compatible with other SO-8 precision op-amps?
The MAX4238ASA-T follows standard SO-8 pinout (OUT–GND–IN+–IN−–SHDN–VCC–N.C.–N.C.), matching industry conventions for dual-supply op-amps-but its SHDN pin is unique among many legacy SO-8 op-amps. While footprint-compatible, functional replacement requires verification of shutdown behavior, offset specs, and noise performance-not just pin count or package.
MAX4238ASA-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:
- 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:
- 8-SOIC
MAX4238ASA-T FAQ
1.How can I place an order for MAX4238ASA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4238ASA-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 MAX4238ASA-T reliable?
The price and inventory of MAX4238ASA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4238ASA-T is usually 5 days.
3.What payment methods are accepted for MAX4238ASA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4238ASA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4238ASA-T?
MAX4238ASA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4238ASA-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 MAX4238ASA-T?
For technical support, including MAX4238ASA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4238ASA-T requirements.
6.How does Aetrix verify that MAX4238ASA-T is sourced from the original manufacturer or authorized distributors?
All MAX4238ASA-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 MAX4238ASA-T meets industry standards.
7.What is the process for return or replacement of MAX4238ASA-T?
All MAX4238ASA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4238ASA-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 MAX4238ASA-T part is unused and in its original packaging.
Return procedure for MAX4238ASA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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