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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:1,128
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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, ±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 MAX4331ESA datasheet, MAX4331ESA pinout, MAX4331ESA application, or MAX4331ESA equivalent, key selection criteria include shutdown-mode current (9µA typ), rail-to-rail common-mode range extending 250mV beyond rails, output swing within 125mV of VCC/VEE into 2kΩ, unity-gain stability, and SO-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX4331ESA employs a dual-input-stage architecture (NPN + PNP differential pairs) to achieve rail-to-rail input common-mode range (–0.25V to VCC + 0.25V) and maintain CMRR ≥69dB over temperature. Its output stage uses complementary push-pull transistors capable of sourcing/sinking ≥20mA while swinging within 125mV of either rail into 2kΩ loads.
It integrates a dedicated SHDN pin referenced to VEE (logic threshold VIL = 2.0V max), enabling deterministic high-impedance output state and 9µA shutdown current per amplifier. The device is unity-gain stable and drives capacitive loads up to 150pF without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - supports stable closed-loop operation up to ~300kHz at AV = 10, suitable for anti-aliasing and sensor interface filtering. |
| Quiescent Supply Current | 245µA per amplifier - enables >1-year battery life in always-on 3V coin-cell applications (e.g., wearable biosensors). |
| Input Offset Voltage | ±250µV (typ) - ensures ≤0.5mV error in 2V full-scale 12-bit ADC front-end without trimming. |
| Rail-to-Rail Output Swing | Within 125mV of VCC/VEE into 2kΩ - preserves dynamic range in 3.3V or lower single-supply systems. |
| Shutdown Current | 9µA per amplifier (typ) - reduces system standby power by >96% vs. active mode, critical for duty-cycled sensing nodes. |
| Common-Mode Input Range | –0.25V to VCC + 0.25V - accepts inputs below ground or above supply, simplifying level-shifting in mixed-signal interfaces. |
| Supply Voltage Range | +2.3V to +6.5V single supply - interoperable with Li-ion (3.0–4.2V), alkaline (2×AA = 3.0V), and USB-powered (5V) platforms. |
Pinout & Package
MAX4331ESA is housed in an 8-pin SO (Small Outline) package with standard 1.27mm pitch, JEDEC MS-012AC compliant, footprint compatible with industry-standard SOIC-8 land patterns.
| 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 most configurations. |
| 2 (IN−) | Inverting input | Differential pair node; bias current polarity flips near VCC/2; matched source impedance minimizes offset error. |
| 3 (IN+) | Noninverting input | Differential pair node; same bias current behavior as IN−; internal 1kΩ series resistors provide ESD protection. |
| 4 (VEE) | Negative supply / ground | Reference for all inputs and SHDN logic; must be connected directly to system ground in single-supply operation. |
| 5 (VCC) | Positive supply | Power rail bypassed with 0.1µF ceramic capacitor to VEE; supports 2.3–6.5V operation with <100mV dropout. |
| 6 (SHDN) | Shutdown control input | VEE-referenced logic input; <0.8V = shutdown (9µA), >2V = active; floating = active; no internal pull-up. |
| 7 (N.C.) | No connection | Internally unconnected; must remain unpopulated or left floating; not tied to any internal node. |
| 8 (N.C.) | No connection | Internally unconnected; identical treatment as Pin 7; avoids unintended coupling or leakage paths. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O with extended common-mode range | Input accepts signals 250mV beyond VEE/VCC; output swings to within 125mV of rails into 2kΩ - maximizes usable signal swing in low-voltage systems. |
| Low-power shutdown mode | Reduces ICC to 9µA per amplifier while placing output in high-Z state - enables rapid power gating without external switches or isolation circuitry. |
| No phase reversal on overdriven inputs | Prevents output latch-up or erroneous saturation when IN+ or IN− exceeds supply rails - eliminates need for clamping diodes in sensor front-ends. |
| Unity-gain stable with capacitive load drive | Stable with ≥150pF load capacitance; eliminates need for isolation resistors in ADC driver or filter applications with long traces or parasitic C. |
| Low input offset voltage tempco | ±3µV/°C - limits drift to <1.5µV over 0°C–70°C ambient, supporting uncalibrated 16-bit measurement accuracy in industrial sensors. |
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 ECG devices. IC Role / Device Role / Timing Role: Single-supply instrumentation amplifier stage with rail-to-rail input to capture baseline shifts 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% gain error in 5mV full-scale ECG waveform digitization. |
Use Scenario: Converting 4–20mA loop current to 0–2.5V analog voltage for microcontroller ADC sampling in factory automation I/O modules. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with low offset and high PSRR to reject supply noise from shared 24V loop power. Use Value: 71dB PSRR at 10kHz rejects switching noise from adjacent DC/DC converters; rail-to-rail output ensures full 0–2.5V span into 100kΩ ADC input. |
| Smart Smoke Detector Signal Chain | Low-Voltage Battery Gauge Circuit |
|
Use Scenario: Conditioning photocell or ionization chamber output in UL-certified battery-operated smoke alarms requiring 10-year shelf life. IC Role / Device Role / Timing Role: Low-power transimpedance amplifier with shutdown mode activated between periodic self-test cycles. Use Value: 9µA shutdown current reduces average system draw to <1µA during 99.9% of standby time; 3MHz bandwidth supports fast pulse detection during alarm events. |
Use Scenario: Measuring cell voltage in lithium coin-cell powered IoT sensors where supply headroom is limited to 2.3–3.0V. IC Role / Device Role / Timing Role: Rail-to-rail buffer isolating battery voltage from ADC input while maintaining accuracy across full discharge curve. Use Value: Operates down to 2.3V minimum supply; ±250µV offset introduces <0.1% error at 2.5V reading - sufficient for ±5mV SOC estimation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2461CDR | Higher quiescent current (500µA), no shutdown pin, 6.4MHz GBW, SO-8 package | Lacks low-power shutdown; better for higher-speed, non-battery applications | Choose TLV2461CDR when speed >3MHz is required and shutdown is unnecessary. |
| MCP6001T-I/OT | Lower quiescent current (100µA), no rail-to-rail input, 1MHz GBW, SOT-23-5 package | Smaller footprint but limited input range (VEE to VCC – 1.2V); unsuitable for true rail-to-rail sensor outputs | Choose MCP6001T-I/OT only if board space is critical and input signals stay >1.2V from rails. |
Compared with TLV2461CDR and MCP6001T-I/OT, the MAX4331ESA uniquely balances rail-to-rail I/O, sub-10µA shutdown, and 3MHz bandwidth in SO-8 - making it the sole option for precision, low-duty-cycle, single-supply sensor interfaces demanding both wide dynamic range and ultra-low standby power.
Availability
MAX4331ESA is available at Aetrix Electronics and suitable for portable medical monitors, industrial loop receivers, smart smoke detectors, and low-voltage battery gauges requiring stable component supply across multi-year production cycles.
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 precision analog and mixed-signal ICs for industrial, medical, and communications applications, emphasizing low-power, high-accuracy performance.
The MAX4330–MAX4334 family was engineered specifically for battery-powered, single-supply signal-conditioning tasks - prioritizing rail-to-rail operation, sub-300µA quiescent current, and robust input protection in compact packages.
FAQ
What is the absolute maximum supply voltage rating for MAX4331ESA?
The MAX4331ESA has an absolute maximum supply voltage (VCC to VEE) rating of 7V. Operation beyond this limit risks permanent damage. Recommended operating range remains +2.3V to +6.5V single supply. Derating curves in the datasheet confirm safe operation up to 7V only under transient conditions - sustained use above 6.5V is not supported.
Does MAX4331ESA support dual-supply operation?
Yes, MAX4331ESA supports dual-supply operation from ±1.15V to ±3.25V. In this configuration, VEE connects to the negative rail (e.g., –1.8V), VCC to the positive rail (e.g., +1.8V), and SHDN logic thresholds remain referenced to VEE. Common-mode range extends 250mV beyond both rails, preserving rail-to-rail functionality.
What is the typical output leakage current in shutdown mode for MAX4331ESA?
The MAX4331ESA specifies ±5µA maximum off-leakage current (IOUT(SHDN)) at TA = –40°C to +85°C when SHDN < 0.8V and VOUT is biased between 0V and VCC. This low leakage ensures minimal loading on downstream circuitry - critical when driving sample-and-hold capacitors or high-impedance ADC inputs during sleep states.
Can MAX4331ESA drive a 1000pF capacitive load?
No - MAX4331ESA is specified stable only up to 150pF capacitive load. Driving 1000pF directly causes peaking, ringing, or oscillation. To interface with heavy capacitive loads, add a series isolation resistor (e.g., 39Ω) between the MAX4331ESA output and the load, as validated in Figure 5 of the datasheet.
Is the MAX4331ESA pin-compatible with other devices in the MAX4330–MAX4334 family?
MAX4331ESA (SO-8) shares identical pinout with MAX4332ESA (dual, SO-8) for Pins 1–5 and 7–8, but differs in Pin 6 (SHDN present in MAX4331ESA, N.C. in MAX4332ESA). MAX4330EUK-T (SOT23-5) and MAX4333ESD (SO-14) use entirely different footprints - no mechanical or electrical pin compatibility exists across package variants.
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:
- 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:
- 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 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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