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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:2,353
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Product details
Overview
MAX4331EUA+ 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, ±0.25mV typical input offset voltage, 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+ datasheet, MAX4331EUA+ pinout, MAX4331EUA+ application, or MAX4331EUA+ equivalent, key selection criteria include shutdown-mode leakage (<5µA), rail-to-rail swing within 125mV of rails at 2kΩ load, 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 (NPN + PNP differential pairs) to achieve rail-to-rail common-mode input range extending 250mV beyond VEE and VCC, with no phase reversal on overdriven inputs. Its output stage drives 2kΩ loads while maintaining rail-to-rail swing and remains stable with capacitive loads up to 150pF.
Shutdown control is implemented via a dedicated SHDN pin referenced to VEE, reducing supply current to 9µA per amplifier (typical) and placing the output in high-impedance state. The device is unity-gain stable and features 71dB minimum CMRR and 75dB minimum PSRR across its operating voltage range.
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 Current | 245µA per amplifier - enables >10-year battery life in always-on sensor interfaces powered by coin cells. |
| Input Offset Voltage | ±0.25mV (typ), ±0.65mV (max) - ensures ≤0.01% gain error in 12-bit precision signal chains at room temperature. |
| Rail-to-Rail Output Swing | Within 125mV of VEE/VCC into 2kΩ - preserves dynamic range in 3.3V or lower single-supply systems. |
| Shutdown Supply Current | 9µA per amplifier (typ) - reduces system standby power to sub-10µA levels when amplifiers are inactive. |
| Common-Mode Input Range | VCM = VEE − 0.25V to VCC + 0.25V - accepts inputs below ground or above supply, critical for AC-coupled sensor front-ends. |
| Operating Supply Range | +2.3V to +6.5V single supply - compatible with Li-ion, Li-Po, and dual AA/AAA battery configurations without regulation. |
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 improved thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN− | Inverting input | Accepts feedback network; input bias current polarity flips near mid-supply due to dual NPN/PNP input stage. |
| 2 - IN+ | Noninverting input | High-impedance node (2.3MΩ differential); requires matched source impedance to IN− to minimize offset error. |
| 3 - VEE | Negative supply / ground | Reference for all internal circuitry and SHDN logic threshold; must be connected even in single-supply use. |
| 4 - OUT | Amplifier output | Capable of sourcing/sinking ≥20mA; enters high-Z state during shutdown with <5µA leakage to either rail. |
| 5 - VCC | Positive supply | Supports 2.3V–6.5V operation; requires local 0.1µF ceramic bypass to VEE for stability. |
| 6 - SHDN | Shutdown enable | Logic-low (≤0.8V w.r.t. VEE) activates shutdown; floating or high (>2V) enables normal operation. |
| 7 - N.C. | No connection | Internally unconnected; must remain unconnected on PCB to avoid parasitic coupling or ESD path disruption. |
| 8 - N.C. | No connection | Internally unconnected; PCB trace must be omitted or isolated to prevent noise injection. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full utilization of supply voltage headroom in low-VDD systems (e.g., 2.5V or 3.3V), maximizing ADC input range without level-shifting. |
| 9µA shutdown current | Reduces total system standby power in multi-channel sensor nodes where only one amplifier is active at a time. |
| No phase reversal | Prevents catastrophic output latch-up during input overvoltage events (e.g., sensor transients), eliminating need for external clamping diodes. |
| Stable with 150pF load | Allows direct driving of ADC input capacitors or long traces without external isolation resistors, simplifying layout. |
| 250µV max offset @ −40°C to +85°C | Ensures consistent DC accuracy across industrial temperature range without calibration in cost-sensitive applications. |
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: First-stage instrumentation amplifier buffer with rail-to-rail input enabling direct AC-coupling to electrode interface. Use Value: 245µA quiescent current extends battery life to >7 days on CR2032; 250mV input common-mode range accommodates electrode half-cell potentials. |
Use Scenario: Converting 4–20mA loop current to ground-referenced voltage for PLC analog input modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Precision I-to-V converter with shutdown capability synchronized to PLC scan cycle to reduce thermal drift during idle periods. Use Value: ±0.25mV offset ensures ≤0.1% full-scale error over temperature; 3MHz bandwidth rejects high-frequency EMI without filtering latency. |
| Smart Smoke Detector Signal Chain | Low-Power Gas Sensor Interface |
Use Scenario: Conditioning weak photoelectric chamber signals in battery-operated residential smoke alarms requiring 10-year shelf life. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier for photodiode output, powered only during periodic self-test cycles. Use Value: 9µA shutdown current minimizes annual self-discharge; rail-to-rail output drives comparator directly without level-shifting components. |
Use Scenario: Amplifying nanoamp-level currents from electrochemical CO or NO₂ sensors in portable air quality monitors. IC Role / Device Role / Timing Role: Ultra-low-power current-to-voltage converter with programmable gain via external resistor network. Use Value: Input bias current <±1nA (typ) prevents sensor polarization; 2.3V min operating voltage supports direct alkaline battery operation. |
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 550µA IQ, no shutdown, SO-5 package only | Lacks low-power sleep mode; unsuitable for duty-cycled sensor nodes | Select when shutdown is unnecessary and higher drive strength (60mA) is required. |
| MCP6001T-E/OT | 1µA IQ, no rail-to-rail input, SOT-23-5 only | Input common-mode range limited to VSS to VDD − 0.3V; cannot handle bipolar sensor outputs | Select for lowest-quiescent-current applications where input voltage stays within supply rails. |
Compared with TLV2461IDBVR and MCP6001T-E/OT, the MAX4331EUA+ uniquely combines rail-to-rail input *and* output, integrated shutdown, and sub-250µA quiescent current in a space-saving µMAX-8 package - making it optimal for battery-constrained, precision analog front-ends requiring flexible input voltage handling.
Availability
MAX4331EUA+ is available at Aetrix Electronics and suitable for portable medical devices, industrial loop receivers, smart smoke detectors, and low-power gas sensor interfaces 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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.
The MAX4330–MAX4334 family was engineered specifically for low-voltage, single-supply signal-conditioning in portable and energy-harvested systems - prioritizing rail-to-rail operation, micropower consumption, and robust input protection.
FAQ
What is the maximum capacitive load the MAX4331EUA+ can drive stably?
The MAX4331EUA+ remains stable with capacitive loads up to 150pF when driving resistive loads ≥1kΩ, as verified in the Capacitive Load Stability graph (Figure TOC21). For loads exceeding this limit, a series isolation resistor (e.g., 39Ω) between the output and capacitor restores stability without degrading DC accuracy - a design technique validated in Figure 5 of the datasheet.
Does the MAX4331EUA+ require dual supplies, or can it operate from a single supply?
The MAX4331EUA+ is fully specified for single-supply operation from +2.3V to +6.5V, with VEE serving as ground reference. Its rail-to-rail input common-mode range extends 250mV beyond both supply rails, allowing input signals to go slightly below ground or above VCC - eliminating the need for dual supplies in most low-voltage applications.
How does the shutdown function behave on the MAX4331EUA+?
When the SHDN pin is pulled low (≤0.8V relative to VEE), the MAX4331EUA+ reduces supply current to 9µA per amplifier (typical) and places the output in high-impedance state with <5µA leakage to either rail. The amplifier resumes normal operation within 1µs after SHDN rises above 2V, as confirmed in Figure 11's enable-time measurement.
Is the MAX4331EUA+ unity-gain stable?
Yes, the MAX4331EUA+ is explicitly characterized and guaranteed unity-gain stable across its full operating temperature and supply range. This is confirmed in the Features list and supported by phase-margin measurements of 55° at unity gain (Table, AC Electrical Characteristics), enabling direct use in voltage-follower configurations without external compensation.
What is the input bias current behavior of the MAX4331EUA+ across common-mode voltage?
The MAX4331EUA+ uses complementary NPN/PNP input stages, causing input bias current to change polarity near mid-supply (VCC/2). As shown in Figure TOC08, IB ranges from −1nA to +1nA depending on VCM - requiring matched source impedances at IN+ and IN− to minimize offset error, especially in high-gain configurations.
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:
- Active
- 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:
- -
- 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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