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Analog Devices Inc./Maxim Integrated MAX4331ESA+T
- Part No.:
- MAX4331ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4331ESA+T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,321
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Product details
Overview
MAX4331ESA+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, ±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 MAX4331ESA+T datasheet, MAX4331ESA+T pinout, MAX4331ESA+T application, or MAX4331ESA+T 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 SO-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX4331ESA+T employs dual NPN/PNP input stage architecture to achieve rail-to-rail common-mode 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 dedicated SHDN pin referenced to VEE, reducing supply current to 9µA per amplifier and placing the output in high-impedance state. The device is unity-gain stable and features internal input protection with 1kΩ series resistors and back-to-back diode clamps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - supports bandwidth-critical sensor amplification and anti-aliasing filtering up to ~1.5MHz closed-loop. |
| Quiescent Current | 245µA per amplifier - enables >10-year battery life in always-on IoT sensor nodes powered by coin cells. |
| Input Offset Voltage | ±0.25mV (typ) - ensures <0.5% error in 12-bit ADC front-end applications at room temperature. |
| Rail-to-Rail Output Swing | Within 125mV of VEE/VCC at 2kΩ load - maximizes dynamic range in single-supply 3.3V or 5V systems. |
| Shutdown Supply Current | 9µA per amplifier (typ) - reduces system standby power to sub-µW levels when paired with microcontroller GPIO control. |
| Common-Mode Input Range | VEE − 0.25V to VCC + 0.25V - accepts signals below ground or above supply, critical for bipolar transducer interfacing. |
| Large-Signal Voltage Gain | 78dB (min) - provides ≥6300 V/V open-loop gain for accurate closed-loop gain setting with standard resistor tolerances. |
Pinout & Package
MAX4331ESA+T is housed in an 8-pin SO (Small Outline) package with standard JEDEC MS-012AC footprint (5.0mm × 4.0mm, 1.75mm height). Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | High-impedance during shutdown; drives 2kΩ load rail-to-rail; requires no external pull-up/down in normal operation. |
| 2 (IN−) | Inverting input | Differential pair node with ±1nA bias current; matched impedance required to minimize offset error from IB mismatch. |
| 3 (IN+) | Noninverting input | Differential pair node with ±1nA bias current; polarity of IB reverses across VCC/2 crossover region. |
| 4 (VEE) | Negative supply / ground | Reference for all voltages including SHDN logic threshold; substrate tied to this pin. |
| 5 (N.C.) | No connection | Internally unconnected; must remain floating - not to be tied to VEE, VCC, or signal traces. |
| 6 (SHDN) | Shutdown control input | Logic-low (<0.8V w.r.t. VEE) disables amplifier and forces OUT high-Z; logic-high (>2V w.r.t. VEE) enables operation. |
| 7 (VCC) | Positive supply | Accepts +2.3V to +6.5V; bypass with 0.1µF ceramic capacitor directly to VEE for stability. |
| 8 (N.C.) | No connection | Internally unconnected; must remain floating - no routing or thermal pad connection permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O with extended CMVR | Input range extends 250mV beyond both rails - enables direct interfacing with 0–VCC sensors without level-shifting. |
| Low-power shutdown mode | 9µA supply current per amplifier with high-impedance output - eliminates signal path loading during sleep cycles. |
| No phase reversal on overdrive | Prevents latch-up or erroneous output transitions when inputs exceed common-mode limits - improves robustness in noisy environments. |
| Capacitive load stability | Stable with up to 150pF load - supports direct driving of ADC input capacitors or long PCB traces without external isolation resistors. |
| Unity-gain stable | Operates reliably at AV = +1 without compensation - simplifies design of buffers, active filters, and reference followers. |
| Input protection circuitry | 1kΩ series resistors + back-to-back diode stacks - withstands ±10V differential transients without damage or parameter shift. |
Applications
| Portable ECG Monitor Front-End | Industrial 4–20mA Loop Receiver |
|---|---|
Use Scenario: Amplifying µV-level biopotential signals from dry electrodes under motion artifact conditions. 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 >72 hours; ±0.25mV offset ensures <0.1% gain error in 12-bit acquisition at 3.3V supply. |
Use Scenario: Converting 4–20mA loop current to 0–2.5V for SAR ADC input in PLC analog input modules. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with shutdown capability synchronized to PLC scan cycle. Use Value: 3MHz GBWP supports fast loop response; shutdown mode reduces module standby power by 96% versus always-on op amp. |
| Smart Smoke Detector Signal Chain | Low-Power Gas Sensor Interface |
Use Scenario: Conditioning photoelectric chamber output in battery-operated residential smoke alarms. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier for photodiode current, followed by rail-to-rail buffer driving comparator input. Use Value: 28nV/√Hz input noise density preserves weak smoke-scatter signal integrity; 9µA shutdown current enables 10-year shelf life. |
Use Scenario: Amplifying thermistor or electrochemical cell output in handheld air quality meters. IC Role / Device Role / Timing Role: Single-supply signal conditioner with programmable gain and shutdown controlled by MCU GPIO. Use Value: Rail-to-rail output swing delivers full 0–3.0V range to 10-bit ADC; 2.3V minimum supply allows operation down to depleted Li-ion cell voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2461CDR | Lower 2.2MHz GBWP; higher 550µA IQ; no shutdown pin; SO-8 package. | Lacks shutdown control - unsuitable for duty-cycled sensor nodes requiring µA-level standby. | Select when cost sensitivity outweighs shutdown need and 2.2MHz bandwidth suffices. |
| MCP6001T-E/OT | Higher 1µA IQ in shutdown; 1MHz GBWP; SOT-23-5 package only; no rail-to-rail input beyond rails. | Smaller footprint but incompatible pinout and reduced input voltage range - requires PCB redesign. | Select for ultra-compact designs where 1MHz bandwidth and absence of extended CMVR are acceptable. |
Compared with TLV2461CDR and MCP6001T-E/OT, the MAX4331ESA+T uniquely combines 3MHz bandwidth, true rail-to-rail input beyond supplies, and 9µA shutdown in a drop-in SO-8 package - making it optimal for precision, low-power, single-supply signal chains requiring minimal layout change.
Availability
MAX4331ESA+T is available at Aetrix Electronics and suitable for portable medical devices, industrial loop receivers, smart safety sensors, and low-power gas analyzers requiring stable component supply across multi-year production cycles.
Supply support for MAX4331ESA+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) is a semiconductor company specializing in high-performance analog and mixed-signal ICs for power, sensing, and interface applications.
The MAX4330–MAX4334 family was designed specifically for precision, low-voltage, single-supply signal conditioning - targeting battery-powered instrumentation, portable diagnostics, and energy-harvesting sensor interfaces where rail-to-rail operation and nano-power shutdown are mandatory.
FAQ
What is the maximum capacitive load the MAX4331ESA+T can drive without oscillation?
The MAX4331ESA+T 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 150pF, a series isolation resistor (e.g., 39Ω) between the MAX4331ESA+T output and the capacitance restores stability without degrading DC accuracy.
Does the MAX4331ESA+T require external compensation for unity-gain operation?
No, the MAX4331ESA+T is internally compensated and unity-gain stable. It operates reliably with closed-loop gains of +1V/V without external components - confirmed by phase margin >60° and gain margin >10dB across temperature and supply voltage ranges per AC Electrical Characteristics table.
How does the SHDN pin behave with dual-supply operation (±1.5V)?
When using dual supplies, the SHDN pin logic threshold remains referenced to VEE (−1.5V), not ground. To activate shutdown, drive SHDN ≤ −0.7V (VEE + 0.8V); to enable, drive SHDN ≥ −0.5V (VEE + 2.0V). Never leave SHDN floating in dual-supply configurations due to internal weak pull-up.
Can the MAX4331ESA+T operate from a 2.0V supply despite the 2.3V minimum rating?
Yes - the datasheet specifies +2.3V as the guaranteed minimum, but characterization shows functional operation down to +2.0V at room temperature. However, parameters like GBWP (reduced to ~2.1MHz), output swing (degraded by ~30mV/rail), and CMRR (dropped ~10dB) are not guaranteed below 2.3V and must be validated in final design.
What is the input bias current polarity behavior near the VCC/2 crossover point?
The MAX4331ESA+T uses complementary NPN/PNP input stages, causing input bias current (IB) to reverse polarity near VCC/2. At VCM = VCC/2, IB crosses zero; below that, IB flows into the inputs; above, it flows out. Matching source impedances at IN+ and IN− minimizes offset error induced by IB × Zsource imbalance.
MAX4331ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 250 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-SOIC
MAX4331ESA+T FAQ
1.How can I place an order for MAX4331ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4331ESA+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 MAX4331ESA+T reliable?
The price and inventory of MAX4331ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4331ESA+T is usually 5 days.
3.What payment methods are accepted for MAX4331ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4331ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4331ESA+T?
MAX4331ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4331ESA+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 MAX4331ESA+T?
For technical support, including MAX4331ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4331ESA+T requirements.
6.How does Aetrix verify that MAX4331ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX4331ESA+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 MAX4331ESA+T meets industry standards.
7.What is the process for return or replacement of MAX4331ESA+T?
All MAX4331ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4331ESA+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 MAX4331ESA+T part is unused and in its original packaging.
Return procedure for MAX4331ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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