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Analog Devices Inc./Maxim Integrated MAX4131EUA+
- Part No.:
- MAX4131EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4131EUA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,459
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Product details
Overview
MAX4131EUA+ from Maxim Integrated is a single, rail-to-rail input/output operational amplifier optimized for low-voltage, single-supply precision signal conditioning. It delivers 10MHz gain-bandwidth, 900µA quiescent current per amplifier, ±0.35mV typical input offset voltage (–40°C to +85°C), and full rail-to-rail swing into 250Ω loads - making it ideal for battery-powered data-acquisition front-ends in portable instrumentation.
For engineers reviewing the MAX4131EUA+ datasheet, MAX4131EUA+ pinout, MAX4131EUA+ application, or MAX4131EUA+ equivalent, key selection criteria include shutdown functionality (25µA standby), capacitive-load stability up to 160pF, unity-gain stability, 4V/µs slew rate, and operation down to +2.7V with typical 1.8V capability.
Technical Context
The MAX4131EUA+ employs a dual-input-stage architecture (NPN + PNP) enabling rail-to-rail common-mode input range extending 200mV beyond VEE and VCC. Its output stage uses complementary push-pull circuitry to achieve millivolt-level output swing near both rails under load.
It integrates a dedicated SHDN pin that places the output in high-impedance state and reduces supply current to ≤40µA (–40°C to +85°C) when asserted low. The device is unity-gain stable and maintains phase margin ≥62° with 160pF capacitive load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 10MHz - supports stable closed-loop operation up to ~1MHz at AV = 10 without compensation. |
| Supply Current per Amplifier | 1.05mA max at +2.7V - enables >100-hour operation on a 100mAh coin cell in active mode. |
| Input Offset Voltage | ±0.35mV (max, –40°C to +85°C) - ensures <0.01% gain error in 10-bit systems with 3V full-scale. |
| Output Voltage Swing | Within 125mV of rails into 250Ω - preserves dynamic range in 3V ADC interfaces driving resistive loads. |
| Slew Rate | 4V/µs - settles 2V step in ≤2.0µs to 0.01%, suitable for multiplexed sensor sampling at 500ksps. |
| Capacitive-Load Stability | Stable with ≤160pF - eliminates need for isolation resistors in anti-alias filter or cable-drive applications. |
| Shutdown Supply Current | ≤40µA (–40°C to +85°C) - enables microamp-level system sleep states without external power gating. |
Pinout & Package
MAX4131EUA+ is housed in an 8-pin µMAX package (pin-compatible with SO-8 but 30% smaller footprint). Thermal performance supports 330mW continuous dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output node - drives 250Ω loads rail-to-rail; high-impedance during SHDN assertion. |
| 2 | IN− | Inverting input - accepts signals from VEE −0.2V to VCC +0.2V; protected by 1kΩ series resistors. |
| 3 | IN+ | Noninverting input - same common-mode range as IN−; bias current polarity flips near VCC/2. |
| 4 | VEE | Negative supply - connect to GND for single-supply operation; sets lower bound of input/output swing. |
| 5 | VCC | Positive supply - operates from +2.7V to +6.5V; requires 0.1µF ceramic + ≥1µF bulk bypass. |
| 6 | N.C. | No internal connection - must remain unconnected; no routing or thermal relief required. |
| 7 | SHDN | Active-low shutdown control - <0.8V disables amplifier; ≥2.0V or open enables; draws ≤3µA. |
| 8 | N.C. | No internal connection - must remain unconnected; not used for thermal pad or grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input CMVR extends 200mV beyond VEE/VCC; output swings within 125mV of rails into 250Ω - maximizes usable signal range in 3V systems. |
| Low-power shutdown | Reduces ICC to ≤40µA while placing OUT in high-Z - enables firmware-controlled power cycling without PCB layout changes. |
| Unity-gain stable | Operates without external compensation at AV = 1 - simplifies design of buffers, active filters, and transimpedance amplifiers. |
| No phase reversal | Remains stable even with IN+ or IN− overdriven beyond rails - prevents latch-up in sensor fault conditions. |
| 160pF capacitive-load drive | Maintains ≥62° phase margin with 160pF load - supports direct connection to ADC input caps or long PCB traces without isolation resistor. |
Applications
| Battery-Powered Instrumentation | Portable Medical Sensors |
|---|---|
Use Scenario: Handheld multimeter front-end amplifying mV-level thermocouple or RTD signals with 3V coin-cell supply. IC Role / Device Role / Timing Role: Precision DC-coupled signal conditioner providing rail-to-rail input range and low offset drift over temperature. Use Value: ±0.35mV max VOS and ±2µV/°C tempco ensure <0.1°C measurement error across –40°C to +85°C operating range. | Use Scenario: Wearable ECG/PPG analog front-end acquiring biopotential signals with ultra-low power budget. IC Role / Device Role / Timing Role: Low-noise, low-IQ amplifier enabling >7-day battery life while maintaining 10MHz bandwidth for artifact rejection. Use Value: 900µA ICC and 22nV/√Hz input noise support SNR >75dB in 100Hz bandwidth with 3V supply. |
| Data-Acquisition System Input Stage | Low-Voltage Industrial Control Loop |
Use Scenario: Channelized DAQ module digitizing 0–3V sensor outputs from multiple transducers using shared 12-bit SAR ADC. IC Role / Device Role / Timing Role: Rail-to-rail buffer isolating sensors from ADC input capacitance and ensuring full-scale utilization. Use Value: 160pF load stability eliminates need for series R, preserving THD <0.003% at 10kHz and settling in 2.0µs. | Use Scenario: 4–20mA loop transmitter output stage converting DAC voltage to current with 3.3V microcontroller supply. IC Role / Device Role / Timing Role: High-swing output driver interfacing between low-voltage DAC and op-amp-based Howland current source. Use Value: Output swing to within 125mV of VCC allows full 0–3.3V DAC range to be translated to 4–20mA with minimal headroom loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Zero-drift architecture; 0.02µV/°C offset drift vs. ±2µV/°C; 350kHz GBWP vs. 10MHz; 17µA ICC vs. 900µA | Better DC precision, worse AC performance; suited for µV-level DC measurements, not wideband signal conditioning | Select OPA333AIDBVR only when sub-µV offset stability dominates over bandwidth and drive strength |
| AD8605ARTZ-R7 | Higher GBWP (10MHz same); lower ICC (1mA same); wider supply range (2.7–5.5V vs. 2.7–6.5V); no shutdown pin | Lacks SHDN function; identical speed/noise but no low-power sleep mode for intermittent sensing | Select AD8605ARTZ-R7 when shutdown is unnecessary and SO-8 footprint compatibility is required |
Compared with OPA333AIDBVR and AD8605ARTZ-R7, MAX4131EUA+ uniquely balances 10MHz bandwidth, rail-to-rail I/O, integrated shutdown, and 250Ω drive capability - making it the only choice among the three for battery-operated, wideband, low-voltage signal chains requiring active power management.
Availability
MAX4131EUA+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical sensors, and data-acquisition system input stages requiring stable component supply with guaranteed long-term availability.
Supply support for MAX4131EUA+ 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 communications systems.
The MAX4130–MAX4134 family was engineered specifically for low-voltage, single-supply signal conditioning where rail-to-rail I/O, low quiescent current, and robust capacitive-load drive are mandatory - targeting portable and energy-constrained measurement systems.
FAQ
What is the minimum operating voltage for MAX4131EUA+?
The MAX4131EUA+ is specified to operate from +2.7V to +6.5V, but test data shows functional operation down to +1.8V at room temperature. However, parameters such as gain-bandwidth, output swing, and offset voltage are not guaranteed below +2.7V - MAX4131EUA+ should be operated within its rated supply range for production designs.
Does MAX4131EUA+ require external compensation for unity-gain stability?
No, MAX4131EUA+ is internally compensated and unity-gain stable. It maintains ≥62° phase margin with 160pF capacitive load and does not require external compensation components - simplifying layout and reducing BOM count in buffer and gain-of-one configurations.
How does the shutdown function affect the output state of MAX4131EUA+?
When the SHDN pin is pulled below 0.8V, MAX4131EUA+ disables the amplifier core and places the OUT pin in a high-impedance state - effectively disconnecting it from the load. This allows multiple MAX4131EUA+ devices to share a common output node without contention during sleep modes.
Can MAX4131EUA+ drive a 1000pF capacitive load?
MAX4131EUA+ is guaranteed stable only up to 160pF. Driving 1000pF directly causes peaking and potential oscillation. To drive larger capacitive loads, add a 39Ω isolation resistor in series with the output - this restores stability while preserving DC accuracy and settling behavior, as validated in Maxim's Figure 6.
What is the input protection scheme used in MAX4131EUA+?
MAX4131EUA+ incorporates 1kΩ series resistors on both inputs plus back-to-back triple diodes across IN+ and IN−. This limits differential input current to safe levels for ±10V transients and provides ESD robustness. Input resistance is ~500kΩ for |VDIFF| < 1.8V and ~2kΩ for higher differentials - a key factor in bias-current error analysis.
MAX4131EUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 4V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 nA
- Voltage - Input Offset:
- 350 µV
- Current - Supply:
- 1mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 6.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4131EUA+ FAQ
1.How can I place an order for MAX4131EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4131EUA+ 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 MAX4131EUA+ reliable?
The price and inventory of MAX4131EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4131EUA+ is usually 5 days.
3.What payment methods are accepted for MAX4131EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4131EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4131EUA+?
MAX4131EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4131EUA+ 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 MAX4131EUA+?
For technical support, including MAX4131EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4131EUA+ requirements.
6.How does Aetrix verify that MAX4131EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4131EUA+ 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 MAX4131EUA+ meets industry standards.
7.What is the process for return or replacement of MAX4131EUA+?
All MAX4131EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4131EUA+, 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 MAX4131EUA+ part is unused and in its original packaging.
Return procedure for MAX4131EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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