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Analog Devices Inc./Maxim Integrated MAX4331EUA-T
- Part No.:
- MAX4331EUA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4331EUA-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,035
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Product details
Overview
MAX4331EUA-T from Maxim Integrated is a single-channel, rail-to-rail input/output operational amplifier optimized for low-voltage, battery-powered systems. It delivers 3MHz gain-bandwidth, 245µA quiescent current per amplifier, ±250µV input offset voltage (typ), and operates from +2.3V to +6.5V single supply - enabling precision signal conditioning in portable data-acquisition front-ends.
For engineers reviewing the MAX4331EUA-T datasheet, MAX4331EUA-T pinout, MAX4331EUA-T application, or MAX4331EUA-T equivalent, this page provides verified specifications, µMAX-8 package layout, shutdown-mode behavior, rail-to-rail I/O performance at 2.3V, and real-world design implications for low-power analog signal chains.
Technical Context
The MAX4331EUA-T employs a dual-input-stage architecture (NPN + PNP differential pairs) to achieve rail-to-rail common-mode input range extending 250mV beyond both VEE and VCC. Its output stage drives 2kΩ loads while maintaining ≤125mV rail clearance under full load, with unity-gain stability and no phase reversal on overdriven inputs.
It integrates a dedicated SHDN pin referenced to VEE, enabling low-leakage (±5µA) high-impedance output state and 9µA shutdown supply current per amplifier. The device is specified across –40°C to +85°C and supports operation down to 2.0V (typical), though minimum guaranteed supply is +2.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - enables stable amplification of signals up to ~300kHz at gain = 10, suitable for sensor buffering and anti-aliasing stages. |
| Quiescent Supply Current | 245µA per amplifier (typ) - allows continuous operation for >1 year on a 200mAh coin cell in always-on monitoring applications. |
| Input Offset Voltage | ±250µV (max at TA = –40°C to +85°C) - ensures <0.5% error in 0–5V measurement ranges without trimming. |
| Rail-to-Rail Output Swing | Swings within 125mV of rails into 2kΩ - preserves dynamic range in 3.3V or 2.5V ADC interfaces without level-shifting. |
| Shutdown Supply Current | 9µA per amplifier (typ) - reduces system standby power by >96% versus active mode, critical for duty-cycled sensors. |
| Common-Mode Input Range | VEE – 0.25V to VCC + 0.25V - accepts inputs below ground or above supply, simplifying bipolar signal interfacing in single-supply systems. |
| Large-Signal Voltage Gain | 70dB (min) at VCC = 2.3V - maintains ≥316× open-loop gain for accurate closed-loop gain setting with feedback resistors. |
Pinout & Package
MAX4331EUA-T 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 improved thermal resistance (4.10mW/°C derating).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN− | Inverting input | Accepts feedback network; polarity-sensitive for stable closed-loop configuration (e.g., inverting amplifier, transimpedance). |
| 2 - IN+ | Noninverting input | High-impedance node for sensor/ADC reference routing; requires matched source impedance to IN− to minimize bias-current-induced offset. |
| 3 - VEE | Negative supply / ground | Reference for all internal circuitry and SHDN logic threshold; must be connected directly to system ground in single-supply use. |
| 4 - OUT | Amplifier output | Capable of sourcing/sinking 20mA; high-impedance during shutdown (leakage <±5µA); requires local 0.1µF bypass to VEE. |
| 5 - VCC | Positive supply | Accepts +2.3V to +6.5V; bypassing with 0.1µF ceramic capacitor to VEE is mandatory for stability and PSRR performance. |
| 6 - N.C. | No connection | Internally unconnected; must remain floating - no external tie or pull-up/down. |
| 7 - SHDN | Shutdown control input | Logic-low (≤0.8V w.r.t. VEE) disables amplifier and forces high-Z output; logic-high (≥2V w.r.t. VEE) enables operation. |
| 8 - N.C. | No connection | Internally unconnected; must remain floating - no external tie or pull-up/down. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 250mV beyond VEE and VCC - eliminates need for level-shifting when interfacing with DACs, thermocouples, or bridge sensors operating near supply rails. |
| Shutdown mode with high-Z output | Reduces ICC to 9µA and disconnects output electrically - enables multiplexed analog front-ends where only one channel is active at a time. |
| No phase reversal on overdriven inputs | Prevents latch-up or erroneous output transitions during input overload - critical for robustness in industrial sensor interfaces with transient surges. |
| Stable driving 2kΩ loads | Maintains rail-to-rail swing and bandwidth into standard test loads - avoids gain error or distortion in buffered ADC driver configurations. |
| Unity-gain stable | Operates reliably with gain = 1 without external compensation - simplifies design of voltage followers for high-impedance sources like pH electrodes or piezoelectric sensors. |
Applications
| Portable ECG Monitor Front-End | Low-Power Gas Sensor Signal Chain |
|---|---|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in a wearable cardiac monitor powered by a 3.0V coin cell. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier buffer with rail-to-rail input to capture full electrode offset range and rail-to-rail output to maximize ADC utilization. Use Value: 245µA quiescent current extends battery life to >12 months; 250µV offset ensures <0.1% baseline drift in 0–3V measurement window. |
Use Scenario: Conditioning output of electrochemical gas sensor (e.g., CO detector) with 100nA–1µA output current, operating from 3.3V Li-ion battery. IC Role / Device Role / Timing Role: Transimpedance amplifier with shutdown control synchronized to periodic sensor wake-up cycles. Use Value: 9µA shutdown current minimizes idle power; rail-to-rail input accepts sensor's negative bias voltage; 3MHz GBW supports fast response to gas concentration changes. |
| Industrial 4–20mA Loop Receiver | Battery-Operated Environmental Data Logger |
Use Scenario: Converting 4–20mA loop current to 0.5–2.5V for ADC sampling in a field-mounted temperature transmitter. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with low offset and high CMRR to reject common-mode noise on long cables. Use Value: 63dB min CMRR at –40°C to +85°C rejects induced noise; ±250µV offset contributes <0.01% error in 2V span; 2.3V min supply supports brownout resilience. |
Use Scenario: Buffering thermistor and humidity sensor outputs in a solar-charged remote weather station with 2.7V–3.6V supply range. IC Role / Device Role / Timing Role: Rail-to-rail I/O buffer isolating high-impedance sensors from ADC input capacitance and enabling low-voltage operation. Use Value: Operates down to 2.3V (guaranteed), tolerating battery sag; 3MHz bandwidth preserves step response of fast-changing RH signals; µMAX-8 saves PCB area in compact enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2461IDBVR | Higher quiescent current (500µA), no shutdown pin, 6.4MHz GBW, SO-5 package | Lacks low-power shutdown; better for higher-speed, non-battery applications | Choose TLV2461IDBVR when speed >3MHz is required and shutdown is unnecessary. |
| OPA333AIDBVR | Zero-drift architecture, 17µA IQ, 350kHz GBW, no shutdown, SOT-23-5 package | Superior DC accuracy (0.1µV/°C drift) but lower bandwidth and no shutdown | Choose OPA333AIDBVR for ultra-low-drift precision DC measurements where shutdown is not needed. |
Compared with TLV2461IDBVR and OPA333AIDBVR, the MAX4331EUA-T uniquely balances 3MHz bandwidth, 245µA IQ, integrated shutdown, and rail-to-rail I/O in a space-constrained µMAX-8 - making it optimal for battery-powered signal chains requiring both speed and ultra-low standby power.
Availability
MAX4331EUA-T is available at Aetrix Electronics and suitable for portable medical devices, environmental sensor nodes, and industrial loop-powered transmitters requiring stable component supply with extended temperature support (–40°C to +85°C) and tape-and-reel delivery.
Supply support for MAX4331EUA-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 precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and communications applications.
The MAX4330–MAX4334 family was engineered specifically for low-voltage, single-supply signal-conditioning in battery-operated equipment - emphasizing rail-to-rail I/O, sub-250µA quiescent current, and robust shutdown functionality without sacrificing bandwidth or DC accuracy.
FAQ
What is the minimum operating supply voltage for MAX4331EUA-T?
The MAX4331EUA-T is guaranteed to operate from +2.3V to +6.5V single supply (or ±1.15V to ±3.25V dual supply). While typical operation extends down to 2.0V, designs requiring guaranteed functionality across temperature and process variation must respect the 2.3V minimum specification. This makes MAX4331EUA-T suitable for systems powered by partially discharged Li-ion or two-cell alkaline batteries.
Does MAX4331EUA-T support true rail-to-rail input and output simultaneously?
Yes. The MAX4331EUA-T features independent rail-to-rail input common-mode range (VEE – 0.25V to VCC + 0.25V) and rail-to-rail output swing (within 125mV of rails into 2kΩ). This allows full-scale signal handling - for example, accepting a 0–3.3V input and delivering a clean 0–3.3V output - without clipping or headroom loss, critical for maximizing ADC resolution in low-voltage systems.
How does the shutdown mode affect the output state of MAX4331EUA-T?
When the SHDN pin is driven low (≤0.8V w.r.t. VEE), the MAX4331EUA-T disables its internal amplifier core and places the OUT pin in a high-impedance state with off-leakage current of ±5µA max. This prevents loading of downstream circuitry and enables safe multiplexing or shared bus architectures. The output remains electrically disconnected until SHDN is returned high (≥2V w.r.t. VEE).
Can MAX4331EUA-T drive capacitive loads, and what is the maximum stable value?
The MAX4331EUA-T is stable driving capacitive loads up to 150pF when combined with appropriate resistive loading, as confirmed in the Capacitive Load Stability graph (Figure TOC21). For loads exceeding 150pF, adding a small isolation resistor (e.g., 39Ω) between the output and capacitance restores stability. This capability supports direct driving of ADC input capacitors or long PCB traces without external compensation networks.
What is the input bias current behavior of MAX4331EUA-T across common-mode voltage?
The MAX4331EUA-T uses complementary NPN/PNP input stages, causing input bias current polarity to reverse near the VCC/2 crossover point. At VCM = VEE or VCC, IB is ±115nA (max); at VCM = VCC/2, it crosses zero. To minimize offset, external source impedances at IN+ and IN− must be matched - especially critical in high-gain or high-impedance sensor interfaces where mismatched paths generate voltage errors.
MAX4331EUA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for MAX4331EUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4331EUA-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 MAX4331EUA-T reliable?
The price and inventory of MAX4331EUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4331EUA-T is usually 5 days.
3.What payment methods are accepted for MAX4331EUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4331EUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4331EUA-T?
MAX4331EUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4331EUA-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 MAX4331EUA-T?
For technical support, including MAX4331EUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4331EUA-T requirements.
6.How does Aetrix verify that MAX4331EUA-T is sourced from the original manufacturer or authorized distributors?
All MAX4331EUA-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 MAX4331EUA-T meets industry standards.
7.What is the process for return or replacement of MAX4331EUA-T?
All MAX4331EUA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4331EUA-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 MAX4331EUA-T part is unused and in its original packaging.
Return procedure for MAX4331EUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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