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Analog Devices Inc./Maxim Integrated MAX4331ESA+
- Part No.:
- MAX4331ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4331ESA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:270
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Product details
Overview
MAX4331ESA+ 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+ datasheet, MAX4331ESA+ pinout, MAX4331ESA+ application, or MAX4331ESA+ equivalent, key selection criteria include shutdown-mode leakage (<5µA), rail-to-rail swing with 2kΩ load drive capability, temperature-stable CMRR (≥69dB over –40°C to +85°C), and verified operation down to 2.0V supply - critical for ultra-low-power sensor interfaces and medical wearable analog stages.
Technical Context
The MAX4331ESA+ 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. This design eliminates phase reversal during overdrive and maintains CMRR >69dB across its full operating temperature range.
Its output stage delivers rail-to-rail swing into 2kΩ loads while remaining unity-gain stable and capable of driving up to 150pF capacitive loads without external compensation. Shutdown mode reduces supply current to 9µA per amplifier and places the output in high-impedance state - confirmed across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - supports accurate amplification of signals up to ~1.5MHz at unity gain in precision sensor front-ends. |
| Quiescent Current | 245µA per amplifier - enables multi-day battery life in always-on portable instrumentation. |
| Input Offset Voltage | ±0.25mV (typ) - ensures <1LSB error in 12-bit ADC interfaces powered from 3.3V rails. |
| Rail-to-Rail Output Swing | Within 70mV of VEE and 100mV of VCC at 3V supply into 2kΩ - maximizes dynamic range in single-supply systems. |
| Shutdown Supply Current | 9µA per amplifier (typ) - allows deep-sleep modes in energy-harvesting nodes without external switches. |
| Common-Mode Input Range | –0.25V to VCC + 0.25V - accepts inputs below ground and above supply, simplifying level-shifting in mixed-signal circuits. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive cabin applications without derating. |
Pinout & Package
MAX4331ESA+ 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; rail-to-rail swing into 2kΩ load; no phase reversal on overdrive. |
| 2 (IN−) | Inverting input | Differential pair node; bias current polarity flips near VCC/2; matched impedance required to minimize offset. |
| 3 (IN+) | Noninverting input | Differential pair node; same bias behavior as IN−; internal 1kΩ series resistors provide ESD protection. |
| 4 (VEE) | Negative supply / ground | Reference for SHDN logic threshold; substrate tied to VEE; must be bypassed with 0.1µF capacitor. |
| 5 (N.C.) | No connection | Not internally bonded; leave unconnected; no electrical function or thermal role. |
| 6 (SHDN) | Shutdown control input | Active-low; referenced to VEE; <0.8V = shutdown (9µA ICC); >2V = active; do not three-state. |
| 7 (VCC) | Positive supply | +2.3V to +6.5V single supply; supports 2.0V typical minimum; bypass with 0.1µF to VEE. |
| 8 (N.C.) | No connection | Not internally bonded; leave unconnected; no routing or thermal impact. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O with extended common-mode range | Inputs accept –0.25V to VCC + 0.25V; outputs swing within 70mV of rails at 3V - preserves full ADC input range in 3.3V systems. |
| Low-power shutdown mode | Reduces ICC to 9µA per amplifier while placing output in high-Z - eliminates need for external analog switches in sleep cycles. |
| No phase reversal on overdriven inputs | Guaranteed via dual NPN/PNP input stage - prevents latch-up or erroneous output transitions in sensor saturation events. |
| Capacitive load stability | Stable with up to 150pF load without compensation - simplifies driving ADC input filters or long PCB traces. |
| Unity-gain stable operation | Validated across full supply (2.3V–6.5V) and temperature (–40°C to +85°C) - enables direct use in buffers without stability margin concerns. |
Applications
| Portable ECG Monitor Front-End | Industrial 4–20mA Loop Receiver |
|---|---|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes under motion artifact. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier buffer with rail-to-rail input to capture sub-millivolt baseline shifts. Use Value: 245µA quiescent current extends battery life to >72 hours; ±0.25mV offset avoids DC drift correction in firmware. |
Use Scenario: Converting 4–20mA loop current to 0–2.5V for SAR ADC sampling in PLC analog input modules. IC Role / Device Role / Timing Role: Precision I-to-V converter with shutdown during module standby. Use Value: Rail-to-rail output ensures full 0–2.5V span utilization; 9µA shutdown current minimizes system standby power. |
| Wearable Pulse Oximeter Analog Path | Low-Power Gas Sensor Signal Chain |
Use Scenario: Driving red/IR LED current sources and amplifying photodiode transimpedance outputs. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) and LED driver buffer with synchronized shutdown. Use Value: 3MHz GBWP supports >1kHz modulation frequencies; 2kΩ load drive capability directly drives LED cathodes. |
Use Scenario: Conditioning low-amplitude electrochemical sensor outputs in battery-operated air quality detectors. IC Role / Device Role / Timing Role: Low-noise, low-drift gain stage preceding 16-bit delta-sigma ADC. Use Value: 250µV offset and 3µV/°C tempco ensure <0.1% FS error over –20°C to +60°C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2461CDR | No shutdown pin; 550µA ICC; 6.4MHz GBWP; 2mV max VOS at 25°C | Better bandwidth but higher power; lacks shutdown for duty-cycled systems | Select when speed >3MHz is required and shutdown is unnecessary. |
| MCP6001T-E/OT | Shut-down capable (1µA ICC); 1MHz GBWP; 4.5mV max VOS; SOT-23-5 only | Lower power shutdown but lower precision and bandwidth; incompatible pinout | Select for cost-sensitive, non-precision applications where 8-pin SO layout is not constrained. |
Compared with TLV2461CDR and MCP6001T-E/OT, MAX4331ESA+ uniquely balances 3MHz bandwidth, rail-to-rail I/O, sub-mV offset, and 9µA shutdown current in an industry-standard 8-pin SO package - making it optimal for portable precision analog systems requiring both performance and ultra-low-power sleep modes.
Availability
MAX4331ESA+ is available at Aetrix Electronics and suitable for portable medical devices, industrial loop receivers, wearable biosensors, and low-power gas detection systems requiring stable component supply across extended production lifecycles.
Supply support for MAX4331ESA+ 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 high-performance 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 - delivering rail-to-rail I/O, shutdown capability, and precision DC specs in space-constrained portable equipment.
FAQ
What is the minimum operating supply voltage for MAX4331ESA+?
The MAX4331ESA+ is specified to operate from +2.3V to +6.5V single supply, but test data confirms reliable functionality down to +2.0V at room temperature. At 2.0V, parameters such as GBWP and output swing degrade slightly - verify performance in final circuit conditions using the Typical Operating Characteristics graphs in the datasheet. MAX4331ESA+ remains functional across its full –40°C to +85°C range at 2.3V minimum.
Does MAX4331ESA+ require external compensation for stability?
No, MAX4331ESA+ is unity-gain stable and does not require external compensation. It remains stable driving resistive loads up to 2kΩ and capacitive loads up to 150pF, as validated in the Capacitive Load Stability graph (Figure TOC21). For loads exceeding 150pF, adding a small isolation resistor (e.g., 39Ω) between output and capacitance restores stability - confirmed in Figure 5 of the datasheet.
How does the shutdown pin (SHDN) behave in MAX4331ESA+?
The SHDN pin on MAX4331ESA+ is active-low and referenced to VEE (not GND). Driving SHDN <0.8V places the amplifier in shutdown mode (ICC ≈9µA, output high-Z); driving SHDN >2V enables normal operation. Do not leave SHDN floating or three-state - internal weak pull-up may cause indeterminate logic states. The pin tolerates voltages from (VEE – 0.3V) to (VCC + 0.3V).
Can MAX4331ESA+ drive a 100kΩ load rail-to-rail?
Yes, MAX4331ESA+ achieves true rail-to-rail output swing into 100kΩ loads - delivering VOUT within 40mV of VEE and VCC at VCC = 5V (per DC Electrical Characteristics Table, row "VOUT"). At lower supplies (e.g., 2.3V), swing degrades to ~60mV from rails into 100kΩ, and to ~100mV into 2kΩ. Full rail-to-rail performance is maintained only with light loads and nominal supply.
Is MAX4331ESA+ pin-compatible with other op-amps in the MAX433x family?
MAX4331ESA+ shares the same 8-pin SO package and pinout with MAX4332ESA (dual) and MAX4334ESD (quad), but functionality differs: only MAX4331ESA+ and MAX4333ESD include shutdown. Pin compatibility enables drop-in replacement for single-channel use, but unused pins (e.g., IN2±, OUT2 on MAX4332ESA) must be left unconnected or terminated per layout guidelines - no electrical conflict exists.
MAX4331ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 250 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-SOIC
MAX4331ESA+ FAQ
1.How can I place an order for MAX4331ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4331ESA+ 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+ reliable?
The price and inventory of MAX4331ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4331ESA+ is usually 5 days.
3.What payment methods are accepted for MAX4331ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4331ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4331ESA+?
MAX4331ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4331ESA+ 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+?
For technical support, including MAX4331ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4331ESA+ requirements.
6.How does Aetrix verify that MAX4331ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX4331ESA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX4331ESA+?
All MAX4331ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4331ESA+, 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+ part is unused and in its original packaging.
Return procedure for MAX4331ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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