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Analog Devices Inc./Maxim Integrated MAX4131EPA
- Part No.:
- MAX4131EPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX4131EPA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,414
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Product details
Overview
MAX4131EPA 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, ±200µV offset voltage (typ), and shutdown capability reducing supply current to 25µA - enabling use in battery-powered data-acquisition front-ends and portable instrumentation.
For engineers reviewing the MAX4131EPA datasheet, MAX4131EPA pinout, MAX4131EPA application, or MAX4131EPA equivalent, key selection criteria include rail-to-rail I/O swing at 2.7V–6.5V supply, 250Ω load drive capability, 160pF capacitive-load stability, and verified shutdown functionality with high-impedance output state.
Technical Context
The MAX4131EPA employs a dual-input-stage architecture (NPN + PNP) to achieve rail-to-rail common-mode input range extending 250mV beyond VEE and VCC, with seamless transition near VCC/2 to minimize CMRR degradation. Its unity-gain-stable, voltage-feedback topology supports stable operation driving 250Ω loads and 160pF capacitive loads without external compensation.
Shutdown control is implemented via a dedicated SHDN pin (logic-high enable, logic-low disable), placing the output in high-impedance state while reducing ICC to ≤40µA over temperature. Input protection includes 1kΩ series resistors and back-to-back triple diodes, limiting differential input current under overvoltage conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 10MHz - enables stable closed-loop operation up to ~1MHz at AV = 10, suitable for anti-aliasing and sensor signal amplification. |
| Supply Voltage Range | +2.7V to +6.5V single supply - supports direct interfacing with 3.3V and 5V systems, including Li-ion battery-powered devices. |
| Input Offset Voltage | ±0.20mV (typ, TA = +25°C, MAX4131ESA) - ensures <100µV error contribution in precision DC-coupled gain stages. |
| Quiescent Current | 900µA per amplifier (VCC = 2.7V) - enables >100-hour operation on a 100mAh coin cell in active mode. |
| Shutdown Current | 25µA per amplifier (typ, VCC = 2.7V) - reduces system standby power by >97% versus active mode. |
| Rail-to-Rail Output Swing | VOL ≤ 125mV above VEE, VOH ≥ 280mV below VCC (RL = 250Ω, VCC = 5V) - maximizes dynamic range in low-voltage ADC driver applications. |
| Capacitive Load Stability | Stable with up to 160pF - eliminates need for isolation resistors when driving ADC input capacitance or long PCB traces. |
Pinout & Package
MAX4131EPA is housed in an 8-pin SO (Small Outline) package with standard JEDEC MS-012AC footprint (5.0mm × 6.2mm, 1.27mm pitch). Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output node - drives external load or next stage; high-impedance during shutdown. |
| 2 | IN− | Inverting input - accepts feedback network or inverted signal path; protected by 1kΩ series resistor. |
| 3 | IN+ | Noninverting input - connects to sensor, reference, or signal source; rail-to-rail common-mode range (VEE − 0.25V to VCC + 0.25V). |
| 4 | VEE | Negative supply terminal - tied to GND for single-supply operation; defines lower rail of input/output swing. |
| 5 | VCC | Positive supply terminal - accepts +2.7V to +6.5V; requires 0.1µF ceramic + ≥1µF bulk bypassing. |
| 6 | N.C. | No internal connection - must remain unconnected; no routing or thermal relief required. |
| 7 | SHDN | Shutdown control input - logic-low (<0.8V) disables amplifier and forces output high-Z; open or logic-high enables operation. |
| 8 | N.C. | No internal connection - must remain unconnected; electrically isolated from die. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 250mV beyond VEE and VCC - enables direct sensing of signals near ground or supply rails without level-shifting. |
| Shutdown mode with high-Z output | Reduces ICC to ≤40µA and isolates output - allows multiplexed sensor front-ends or power-gated signal chains without loading downstream nodes. |
| 160pF capacitive-load stability | Operates without external isolation resistor - simplifies layout and preserves bandwidth when driving SAR ADC inputs or long traces. |
| No phase reversal on overdriven inputs | Prevents output latch-up during input overload - critical for robustness in industrial sensor interfaces exposed to ESD or transients. |
| Low input bias current (±50nA typ) | Minimizes voltage error across high-impedance sources (e.g., thermocouples, pH electrodes) without requiring matched impedance networks. |
Applications
| Battery-Powered Data Loggers | Portable Medical Sensors |
|---|---|
Use Scenario: Amplifying low-level thermistor or strain-gauge outputs in handheld environmental monitors powered by CR2032 cells. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with rail-to-rail I/O, operating from 3.0V supply and entering shutdown between readings. Use Value: 900µA active current and 25µA shutdown current extend battery life to >1 year; ±200µV offset ensures <0.1°C measurement error in temperature sensing. |
Use Scenario: Conditioning ECG electrode signals in wearable heart-rate monitors with strict size and power constraints. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier driver with 10MHz GBW supporting fast settling for 1kSPS sampling. Use Value: Rail-to-rail output swing maximizes ADC utilization at 3.3V supply; 160pF stability avoids external components in compact flex PCB layouts. |
| Industrial Sensor Transmitters | Low-Voltage Test Equipment |
Use Scenario: Signal conditioning for 4–20mA loop-powered pressure transmitters operating from 12V–24V supplies with local 3.3V regulation. IC Role / Device Role / Timing Role: Buffered reference voltage follower and sensor gain stage, leveraging rail-to-rail input to accept wide common-mode ranges. Use Value: CMVR extends 250mV beyond rails - accommodates sensor offsets up to ±200mV without clipping; 78dB PSRR rejects supply ripple. |
Use Scenario: Active probe amplifier in handheld multimeters and oscilloscope accessories requiring wide bandwidth and low noise. IC Role / Device Role / Timing Role: High-fidelity buffer and gain block with 22nV/√Hz input noise and 4V/µs slew rate for accurate AC signal reproduction. Use Value: 10MHz GBW supports accurate measurement of 1MHz sine waves; THD <0.003% ensures fidelity in audio-frequency test signals. |
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 (0.1µV/°C TCVOS), lower offset (±2µV max), but higher ICC (17µA) and no shutdown pin. | Lacks integrated shutdown; requires external enable circuitry for power gating - increases BOM count and layout area. | Preferred for ultra-low-drift DC applications where shutdown is managed externally or not required. |
| AD8605ARTZ-REEL7 | Higher GBWP (10MHz same), lower noise (12nV/√Hz), but no shutdown and higher ICC (1mA); SO-8 package compatible. | Not pin-compatible due to missing SHDN pin (pin 7 is N.C. on AD8605); requires PCB redesign to implement enable function. | Chosen when lowest noise and highest precision outweigh need for integrated shutdown and power savings. |
Compared with OPA333AIDBVR and AD8605ARTZ-REEL7, MAX4131EPA uniquely integrates shutdown with rail-to-rail I/O and 10MHz bandwidth in an SO-8 package - delivering optimal trade-off of precision, power efficiency, and functional integration for portable and battery-constrained designs.
Availability
MAX4131EPA 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 (-40°C to +85°C).
Supply support for MAX4131EPA 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX4130–MAX4134 family was designed specifically for precision, low-voltage, single-supply signal-conditioning applications - emphasizing rail-to-rail operation, low power, and robustness in portable and battery-operated systems.
FAQ
What is the operating supply voltage range for MAX4131EPA?
The MAX4131EPA operates from a single supply of +2.7V to +6.5V or dual supplies of ±1.35V to ±3.25V. At VCC = 2.7V, it maintains full rail-to-rail input common-mode range (VEE − 0.25V to VCC + 0.25V) and output swing, making MAX4131EPA suitable for direct integration with 3.3V microcontrollers and low-voltage ADCs.
Does MAX4131EPA support true rail-to-rail input and output operation?
Yes, MAX4131EPA provides rail-to-rail input common-mode voltage range extending 250mV beyond both supply rails and rail-to-rail output voltage swing. At VCC = 5V and RL = 250Ω, typical output swing is within 125mV of VEE and 280mV of VCC - confirmed in the MAX4131EPA datasheet's DC Electrical Characteristics table.
How does the shutdown feature work on MAX4131EPA?
The MAX4131EPA shutdown pin (SHDN, pin 7) places the amplifier in low-power state when pulled below 0.8V, reducing supply current to ≤40µA and forcing the output into high-impedance. Pulling SHDN ≥2.0V or leaving it floating enables normal operation. This behavior is fully characterized in the MAX4131EPA AC and DC Electrical Characteristics tables.
Can MAX4131EPA drive a 250Ω load effectively?
Yes, MAX4131EPA is explicitly specified to drive 250Ω loads with minimal distortion and full rail-to-rail swing. The datasheet confirms output voltage swing specifications (e.g., VOL ≤ 125mV, VOH ≥ 280mV at VCC = 5V, RL = 250Ω) and large-signal voltage gain (≥75dB) under this condition - validating its use as an ADC driver or actuator interface in MAX4131EPA-based designs.
Is MAX4131EPA stable with capacitive loads?
MAX4131EPA is unity-gain stable and characterized for capacitive-load stability up to 160pF without external compensation. This is verified in the MAX4131EPA Typical Operating Characteristics (Figure 4: Capacitive-Load Stability) and AC Electrical Characteristics table - enabling direct connection to ADC inputs, filters, or long PCB traces without isolation resistors.
MAX4131EPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX4131EPA FAQ
1.How can I place an order for MAX4131EPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4131EPA 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 MAX4131EPA reliable?
The price and inventory of MAX4131EPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4131EPA is usually 5 days.
3.What payment methods are accepted for MAX4131EPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4131EPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4131EPA?
MAX4131EPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4131EPA 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 MAX4131EPA?
For technical support, including MAX4131EPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4131EPA requirements.
6.How does Aetrix verify that MAX4131EPA is sourced from the original manufacturer or authorized distributors?
All MAX4131EPA 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 MAX4131EPA meets industry standards.
7.What is the process for return or replacement of MAX4131EPA?
All MAX4131EPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4131EPA, 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 MAX4131EPA part is unused and in its original packaging.
Return procedure for MAX4131EPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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