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Analog Devices Inc./Maxim Integrated MAX4131ESA
- Part No.:
- MAX4131ESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4131ESA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,610
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Product details
Overview
MAX4131ESA 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, ±0.20mV typical input offset voltage (25°C), and operates from +2.7V to +6.5V. It is used in battery-powered data-acquisition front-ends where rail-to-rail swing and low power are critical.
For engineers reviewing the MAX4131ESA datasheet, MAX4131ESA pinout, MAX4131ESA application, or MAX4131ESA equivalent, key selection criteria include shutdown functionality (25µA mode), 160pF capacitive-load stability, output swing within 240mV of rails under 250Ω load, and guaranteed −40°C to +85°C operation in SO-8 package.
Technical Context
The MAX4131ESA employs a dual-input-stage architecture-NPN and PNP differential pairs-that enables rail-to-rail common-mode input range extending 200mV beyond VEE and VCC. Its unity-gain stable design supports high-speed closed-loop configurations without external compensation.
It integrates an active shutdown control (SHDN pin) that places the output in high-impedance state and reduces supply current to ≤40µA over temperature. The output stage drives 250Ω loads while maintaining rail-to-rail swing and exhibits no phase reversal when inputs are overdriven.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 10MHz - supports stable amplification up to ~1MHz at gain ≥10, suitable for anti-aliasing and sensor interface filters. |
| Supply Current per Amplifier | 900µA (typ @ 2.7V) - enables multi-channel, battery-operated systems with >100-hour runtime on coin cells. |
| Input Offset Voltage | ±0.20mV (typ @ 25°C), ±0.75mV (max @ −40°C to +85°C) - ensures <0.02% error in 10-bit ADC front-ends without trimming. |
| Rail-to-Rail Output Swing | VOL ≤190mV, VOH ≥VCC−250mV @ RL=250Ω - preserves full dynamic range in 3V systems driving resistive loads. |
| Capacitive-Load Stability | Stable with up to 160pF - eliminates need for isolation resistors when driving ADC input capacitance or long PCB traces. |
| Shutdown Supply Current | ≤40µA (max @ −40°C to +85°C) - allows deep-sleep modes in portable instrumentation with fast wake-up (<1µs). |
| Common-Mode Input Range | VEE −0.20V to VCC +0.20V - accepts signals from ground to supply in single-supply sensor interfaces without level-shifting. |
Pinout & Package
MAX4131ESA is housed in an 8-pin SO (Small Outline) package with standard JEDEC MO-153 footprint. Pin 1 is located at the top-left corner adjacent to the index mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output - rail-to-rail capable, high-impedance during shutdown. |
| 2 | IN− | Inverting input - matched bias current path; requires impedance balancing for minimal offset error. |
| 3 | IN+ | Noninverting input - same CMVR as IN−; immune to phase reversal on overdrive. |
| 4 | VEE | Negative supply - connect to GND for single-supply operation; extends CMVR below ground. |
| 5 | VCC | Positive supply - accepts +2.7V to +6.5V; bypass with 0.1µF ceramic + ≥1µF bulk capacitor. |
| 6 | N.C. | No connection - not internally bonded; leave unconnected on PCB. |
| 7 | SHDN | Shutdown control - logic-low (<0.8V) disables amplifier and reduces ICC to ≤40µA; floating or ≥2.0V enables. |
| 8 | N.C. | No connection - not internally bonded; leave unconnected on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full-scale signal capture in 3V systems without supply translation or clamping diodes. |
| 10MHz GBWP with unity-gain stability | Supports high-fidelity amplification of kHz-range sensor outputs without external compensation networks. |
| 25µA shutdown mode (typ) | Reduces system standby power by >97% versus active mode, critical for always-on monitoring nodes. |
| No phase reversal on overdriven inputs | Prevents latch-up or erroneous output states when input transients exceed supply rails. |
| Stable with 160pF capacitive load | Directly drives ADC sample-and-hold inputs or long traces without destabilizing oscillation. |
| Input protection circuitry | 1kΩ series resistors + back-to-back triple diodes limit differential input fault current to safe levels. |
Applications
| Battery-Powered Data Loggers | Portable Medical Sensors |
|---|---|
Use Scenario: Continuous analog signal acquisition from thermistors and strain gauges in handheld ECG or pulse oximeter units powered by CR2032 batteries. IC Role / Device Role / Timing Role: Precision front-end amplifier providing rail-to-rail buffering and gain before 12-bit SAR ADC sampling at 1–10ksps. Use Value: 900µA quiescent current extends battery life beyond 200 hours; ±0.75mV max offset ensures <0.1% measurement error across industrial temperature range. |
Use Scenario: Low-noise amplification of microvolt-level bio-potential signals (e.g., EEG, EMG) in wearable diagnostic patches. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with shutdown control synchronized to wireless transmission intervals. Use Value: Shutdown current ≤40µA enables 95% duty-cycled operation; 22nV/√Hz input noise preserves SNR in sub-10µV signal chains. |
| Industrial Sensor Transmitters | Low-Voltage PLC Analog Inputs |
Use Scenario: 4–20mA loop-powered transmitter converting RTD or thermocouple outputs in factory-floor environments. IC Role / Device Role / Timing Role: Rail-to-rail I/O buffer isolating sensor bridge from ADC and compensating for supply headroom loss. Use Value: CMVR extending 200mV beyond rails accommodates sensor excitation offsets; 10MHz GBWP supports fast linearization algorithms. |
Use Scenario: Signal conditioning for 0–10V analog inputs in compact programmable logic controllers operating from 3.3V rails. IC Role / Device Role / Timing Role: Input driver ensuring full-scale ADC utilization despite varying source impedances and PCB trace capacitance. Use Value: 160pF capacitive-load stability eliminates need for output RC filters; SO-8 package enables automated assembly in space-constrained modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Zero-drift architecture; 0.02µV/°C offset drift vs. MAX4131ESA's ±2µV/°C; 350kHz GBWP vs. 10MHz | Better DC precision but insufficient bandwidth for >10kHz sensor signals or fast-settling ADC drivers | Select OPA333AIDBVR only when ultra-low drift dominates over speed and power |
| AD8605ARTZ-REEL7 | Higher supply current (1mA); wider supply range (2.7–5.5V); no shutdown pin; 10MHz GBWP and rail-to-rail I/O retained | Lacks power-gating capability; unsuitable for intermittent-sampling architectures requiring µA-level sleep current | Choose AD8605ARTZ-REEL7 when shutdown is unnecessary and layout uses SOT23-5 footprint |
Compared with OPA333AIDBVR and AD8605ARTZ-REEL7, MAX4131ESA uniquely balances 10MHz bandwidth, rail-to-rail operation, 25µA shutdown, and SO-8 manufacturability-making it optimal for cost-sensitive, battery-aware industrial signal chains where both speed and low-power sleep matter.
Availability
MAX4131ESA is available at Aetrix Electronics and suitable for battery-powered instruments, portable medical sensors, and industrial sensor transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4131ESA 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-emphasizing rail-to-rail I/O, low quiescent current, and robust capacitive-load drive in compact packages like SO-8 and UCSP.
FAQ
What is the maximum capacitive load the MAX4131ESA can drive without instability?
The MAX4131ESA remains unity-gain stable with capacitive loads up to 160pF, as verified in the datasheet's AC Electrical Characteristics and Figure 4 (Capacitive-Load Stability). This allows direct interfacing with ADC input capacitance or long PCB traces without adding isolation resistors. Exceeding 160pF may cause peaking or oscillation unless compensated per Application Note 1891.
Does the MAX4131ESA require external components to achieve rail-to-rail input operation?
No. The MAX4131ESA achieves rail-to-rail input operation intrinsically via its dual NPN/PNP input stage-no external level shifters or bias networks are needed. Its common-mode input voltage range extends from VEE −0.20V to VCC +0.20V across −40°C to +85°C, enabling direct connection to grounded or supply-referenced sensors.
What is the typical turn-on time for the MAX4131ESA after asserting the SHDN pin?
The MAX4131ESA enables fully within 1µs after SHDN rises above 2.0V, as shown in Figure 12 of the datasheet. During this interval, output transitions from high-impedance to active rail-to-rail behavior while supply current ramps from ≤40µA to ~900µA. This fast wake-up supports burst-mode data acquisition in energy-constrained systems.
Can the MAX4131ESA operate from a 1.8V supply despite the 2.7V minimum rating?
While the absolute minimum specified supply is +2.7V, the MAX4131ESA typically functions down to +1.8V as noted in the General Description. However, parameters such as GBWP, output swing, and CMRR degrade below 2.7V and are not guaranteed. For production designs, maintain ≥2.7V to ensure compliance with all datasheet limits including ±0.75mV max offset and 10MHz GBWP.
How does the MAX4131ESA handle overdriven inputs, and is phase reversal a concern?
The MAX4131ESA features intrinsic immunity to phase reversal when inputs exceed the supply rails-confirmed in the Applications Information section. Its input stage uses overlapping NPN/PNP pairs with extended switchover region near VCC/2, preventing output polarity inversion during transient overdrive. This eliminates risk of latch-up in sensor front-ends exposed to ESD or cable disconnect events.
MAX4131ESA 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:
- 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:
- 200 µV
- Current - Supply:
- 1mA
- Current - Output / Channel:
- 50 mA
- 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-SOIC
MAX4131ESA FAQ
1.How can I place an order for MAX4131ESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4131ESA 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 MAX4131ESA reliable?
The price and inventory of MAX4131ESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4131ESA is usually 5 days.
3.What payment methods are accepted for MAX4131ESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4131ESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4131ESA?
MAX4131ESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4131ESA 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 MAX4131ESA?
For technical support, including MAX4131ESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4131ESA requirements.
6.How does Aetrix verify that MAX4131ESA is sourced from the original manufacturer or authorized distributors?
All MAX4131ESA 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 MAX4131ESA meets industry standards.
7.What is the process for return or replacement of MAX4131ESA?
All MAX4131ESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4131ESA, 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 MAX4131ESA part is unused and in its original packaging.
Return procedure for MAX4131ESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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