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Analog Devices Inc./Maxim Integrated MAX4331EUA
- Part No.:
- MAX4331EUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4331EUA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,893
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Product details
Overview
MAX4331EUA from Maxim Integrated is a single, low-power, rail-to-rail input/output operational amplifier with shutdown control, designed for precision signal conditioning in battery-powered systems. It delivers 3MHz gain-bandwidth, 245µA quiescent current per amplifier, ±0.25mV typical input offset voltage, and operates from +2.3V to +6.5V single supply - enabling high-accuracy analog front-ends in portable data-acquisition equipment.
For engineers reviewing the MAX4331EUA datasheet, MAX4331EUA pinout, MAX4331EUA application, or MAX4331EUA equivalent, key selection criteria include shutdown current (9µA), rail-to-rail I/O swing at 2.3V supply, output drive capability into 2kΩ, temperature-stable offset (±3µV/°C), and µMAX-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX4331EUA employs a dual-input-stage architecture-comprising complementary NPN and PNP differential pairs-to achieve rail-to-rail common-mode input range extending 250mV beyond both VEE and VCC. This design eliminates phase reversal during overdrive and maintains CMRR ≥63dB across –40°C to +85°C.
Its output stage uses a Class AB topology capable of sourcing/sinking ≥20mA while swinging within 125mV of either rail into 2kΩ loads. The amplifier is unity-gain stable and supports capacitive loads up to 150pF without external compensation, verified under AC conditions with 15pF load and 10kΩ feedback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - supports stable closed-loop operation up to ~2.5MHz at AV = +2 with adequate phase margin. |
| Quiescent Supply Current | 245µA per amplifier - enables >1000-hour battery life in 10µA-systems with duty-cycled operation. |
| Input Offset Voltage | ±0.25mV (typ), ±0.7mV (max) - ensures ≤0.5LSB error in 12-bit ADC front-ends at 5V full-scale. |
| Supply Voltage Range | +2.3V to +6.5V single supply - interoperable with Li-ion (3.0–4.2V), alkaline (2×AA), and regulated 3.3V/5V rails. |
| Shutdown Current | 9µA per amplifier (typ) - reduces system standby power by >96% versus active mode. |
| Output Voltage Swing | VOL ≤125mV above VEE, VOH ≥125mV below VCC into 2kΩ - preserves dynamic range in low-voltage signal chains. |
| Common-Mode Input Range | VEE – 0.25V to VCC + 0.25V - accepts inputs beyond supply rails, simplifying sensor interfacing without level-shifting. |
Pinout & Package
MAX4331EUA is housed in an 8-pin µMAX package (3.0mm × 3.0mm, 0.8mm height), pin-compatible with industry-standard SO-8 but with 50% smaller footprint and thermal resistance of 4.10mW/°C above +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN− | Inverting input | Accepts feedback network; bias current polarity flips near VCC/2 - match source impedances to minimize offset. |
| 2 - IN+ | Noninverting input | High-impedance node (2.3MΩ differential); protected by 1kΩ series resistors and back-to-back diode clamps. |
| 3 - VEE | Negative supply / ground | Reference for all signals in single-supply mode; substrate tied internally to VEE for latch-up immunity. |
| 4 - OUT | Amplifier output | Capable of driving 2kΩ loads rail-to-rail; high-impedance in shutdown mode (leakage <±5nA). |
| 5 - VCC | Positive supply | Must be bypassed with 0.1µF ceramic capacitor to VEE; supports operation down to 2.0V (typical). |
| 6 - SHDN | Shutdown control input | Logic threshold referenced to VEE: VIH ≥2.0V, VIL ≤0.8V; do not three-state - internal pull-up insufficient. |
| 7 - N.C. | No connection | Not internally bonded; leave unconnected or tie to VEE for mechanical stability (not electrically required). |
| 8 - N.C. | No connection | Not internally bonded; same handling as Pin 7 - no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 250mV beyond VEE and VCC - eliminates need for input biasing resistors in single-supply sensor interfaces. |
| Shutdown mode with high-Z output | Reduces ICC to 9µA and disconnects output - enables multiplexed analog channels without crosstalk or loading. |
| No phase reversal on overdrive | Guaranteed behavior up to |VIN+ − VIN−| > 2.5V - prevents latch-up or erroneous output transitions in fault conditions. |
| Unity-gain stable with 150pF capacitive load | Eliminates need for isolation resistors in driving ADC inputs or long traces - simplifies layout and reduces BOM count. |
| Low input offset voltage drift | ±3µV/°C max - maintains calibration integrity over industrial temperature range without software compensation. |
Applications
| Portable ECG Monitor Front-End | Industrial 4–20mA Loop Receiver |
|---|---|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in ultra-low-power wearable health devices. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier stage with rail-to-rail output driving 12-bit SAR ADC reference buffer. Use Value: 245µA quiescent current and 9µA shutdown enable multi-day battery life; ±0.25mV offset minimizes baseline drift in ST-segment analysis. |
Use Scenario: Converting 4–20mA loop current to 0–5V signal for PLC analog input modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Low-drift transimpedance amplifier with programmable gain, powered directly from loop-derived 24V supply. Use Value: Rail-to-rail input accommodates wide common-mode range (0–20V); 3MHz bandwidth supports fast loop diagnostics and step-response validation. |
| Handheld Gas Sensor Signal Chain | Battery-Powered Data Logger Analog Front-End |
Use Scenario: Conditioning low-amplitude, high-impedance outputs from electrochemical gas sensors in portable air quality analyzers. IC Role / Device Role / Timing Role: High-input-impedance buffer isolating sensor from RC filter and anti-aliasing stage feeding 16-bit delta-sigma ADC. Use Value: 2.3MΩ differential input resistance minimizes sensor loading; 250mV beyond-rail input range accepts sensor open-circuit voltages up to 2.55V on 2.3V supply. |
Use Scenario: Multiplexed analog signal acquisition from thermistors, RTDs, and strain gauges in solar-powered environmental monitoring nodes. IC Role / Device Role / Timing Role: Channel-selectable gain stage with shutdown control synchronized to ADC conversion cycle. Use Value: 9µA shutdown current allows per-channel power gating - reducing total analog subsystem current to <1µA between samples. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2461IDBVR | Lower GBWP (6.4MHz), higher ICC (600µA), no shutdown, SOT-23-6 package | Lacks low-power shutdown and rail-to-rail input beyond rails - unsuitable for battery-critical or wide-VCM designs | Select only if higher speed is prioritized over power and input range; requires PCB redesign for 6-pin footprint. |
| AD8601ARTZ-REEL7 | Lower offset (60µV typ), no shutdown, SOT-23-5 package, 8MHz GBWP, 240µA ICC | Missing shutdown and rail-to-rail input beyond supplies - limits use in wake-on-event architectures and direct sensor interfacing | Prefer when ultra-low offset dominates requirements and shutdown is managed externally; incompatible pinout vs. µMAX-8. |
Compared with TLV2461IDBVR and AD8601ARTZ-REEL7, MAX4331EUA uniquely combines sub-10µA shutdown, 250mV beyond-rail input, and µMAX-8 packaging - making it the only option supporting true zero-power sleep modes and direct interface to unbuffered sensors in space-constrained portable systems.
Availability
MAX4331EUA is available at Aetrix Electronics and suitable for portable medical devices, industrial loop receivers, handheld environmental sensors, and battery-powered data loggers requiring stable component supply across extended product lifecycles.
Supply support for MAX4331EUA 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 fabless semiconductor company specializing in high-performance analog and mixed-signal ICs for power, sensing, and connectivity applications.
The MAX4330–MAX4334 family was engineered specifically for low-voltage, single-supply precision signal conditioning - targeting portable instrumentation, battery-operated sensors, and energy-efficient industrial I/O modules where rail-to-rail operation and nanoamp shutdown are mandatory.
FAQ
What is the minimum operating voltage for MAX4331EUA?
The MAX4331EUA is specified to operate from +2.3V to +6.5V single supply. However, datasheet Typical Operating Characteristics confirm reliable functionality down to +2.0V at room temperature, though parameters like CMRR and PSRR degrade slightly below 2.3V. For production designs, maintain ≥2.3V to guarantee all specifications across –40°C to +85°C.
Does MAX4331EUA support dual-supply operation?
Yes, MAX4331EUA supports dual-supply operation from ±1.15V to ±3.25V. In this configuration, VEE connects to the negative rail and VCC to the positive rail. The shutdown pin (SHDN) logic threshold remains referenced to VEE, so pulling SHDN to VEE places the device in shutdown - critical for proper operation in split-rail systems.
Can MAX4331EUA drive ADC inputs directly?
Yes, MAX4331EUA can directly drive SAR and delta-sigma ADC inputs. Its unity-gain stability, 150pF capacitive load tolerance, rail-to-rail output swing, and low 28nV/√Hz input noise ensure minimal settling error and SNR degradation. For optimal performance, place a 0.1µF bypass capacitor at the ADC reference pin and keep analog traces short and shielded.
What happens to the output during MAX4331EUA shutdown?
During shutdown (SHDN ≤0.8V), the MAX4331EUA output enters a high-impedance state with off-leakage current ≤±5nA over temperature. The amplifier core disables completely, reducing supply current to 9µA per amplifier. Output voltage is undefined and must not be loaded - external pull-up/down resistors may be needed if bus contention is possible.
Is MAX4331EUA pin-compatible with other packages in the MAX433x family?
No - MAX4331EUA uses the 8-pin µMAX package, while MAX4330EUK-T uses 5-pin SOT23-5 and MAX4331ESA uses 8-pin SO. Though functional equivalents exist, pinouts differ: µMAX-8 has N.C. on Pins 7 and 8, SO-8 routes VCC/VEE to different locations, and SOT23-5 lacks SHDN. PCB layout must be specific to µMAX-8 for MAX4331EUA.
MAX4331EUA 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:
- 1.5V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 25 nA
- Voltage - Input Offset:
- 650 µV
- Current - Supply:
- 275µA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 2.3 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
MAX4331EUA FAQ
1.How can I place an order for MAX4331EUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4331EUA 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 MAX4331EUA reliable?
The price and inventory of MAX4331EUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4331EUA is usually 5 days.
3.What payment methods are accepted for MAX4331EUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4331EUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4331EUA?
MAX4331EUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4331EUA 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 MAX4331EUA?
For technical support, including MAX4331EUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4331EUA requirements.
6.How does Aetrix verify that MAX4331EUA is sourced from the original manufacturer or authorized distributors?
All MAX4331EUA 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 MAX4331EUA meets industry standards.
7.What is the process for return or replacement of MAX4331EUA?
All MAX4331EUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4331EUA, 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 MAX4331EUA part is unused and in its original packaging.
Return procedure for MAX4331EUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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