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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:4,105
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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, ±250µV 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 common-mode range extending 250mV beyond rails, output swing within 70mV of VEE and 100mV of VCC at 3V supply with 2kΩ load, and guaranteed operation down to 2.0V.
Technical Context
The MAX4331ESA-T employs a dual-input-stage architecture combining NPN and PNP differential pairs to achieve rail-to-rail common-mode input range (VEE − 0.25V to VCC + 0.25V) without phase reversal on overdrive. 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 no internal compensation requiring external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - supports stable closed-loop operation up to ~300kHz at gain = 10, suitable for anti-aliasing and sensor amplification. |
| Quiescent Current | 245µA per amplifier - enables >1-year battery life in always-on 3V coin-cell applications with µA-level sleep modes. |
| Input Offset Voltage | ±250µV (max) - ensures ≤0.5mV error in 2V full-scale 12-bit ADC interfaces without trimming. |
| Supply Range | +2.3V to +6.5V single supply - interoperable with Li-ion, Li-Po, and 3.3V/5V system rails; functional down to 2.0V. |
| Output Swing | Within 70mV of VEE and 100mV of VCC at 3V supply into 2kΩ - preserves dynamic range in low-voltage SAR ADC drivers. |
| Shutdown Current | 9µA per amplifier (typical) - reduces system standby power by >96% versus active mode. |
| CMRR | 69dB (min) at VCC = 5V - rejects supply noise in single-supply mixed-signal circuits with shared ground paths. |
Pinout & Package
MAX4331ESA-T is housed in an 8-pin SO (Small Outline) package with 1.27mm pitch, JEDEC MS-012AC compliant, body size 4.9mm × 6.0mm × 1.75mm.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN− | Inverting input - accepts signals up to VEE − 0.25V or VCC + 0.25V; polarity-sensitive bias current requires matched source impedances. |
| 2 | IN+ | Noninverting input - same rail-to-rail common-mode range as IN−; used for unity-gain buffers or noninverting amplifiers. |
| 3 | OUT | Amplifier output - high-impedance during shutdown; drives 2kΩ loads with <125mV rail margin at 3V. |
| 4 | VEE | Negative supply / ground reference - internally tied to substrate; must be connected to system ground in single-supply use. |
| 5 | VCC | Positive supply - bypass with 0.1µF ceramic capacitor to VEE for stability; supports 2.3V–6.5V operation. |
| 6 | SHDN | Shutdown control input - logic-low (≤0.8V w.r.t. VEE) disables amplifier and forces high-Z output; no pull-up required. |
| 7 | N.C. | No connection - not internally bonded; leave floating or grounded (no electrical effect). |
| 8 | N.C. | No connection - identical to Pin 7; no routing or termination needed. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input common-mode extends 250mV beyond both rails; output swings to within 70mV of VEE and 100mV of VCC at 3V - maximizes usable signal range in 3.3V systems. |
| Low-power shutdown | Reduces ICC to 9µA per amplifier (typical) and places OUT in high-impedance - enables power-gating in multi-channel sensor arrays. |
| No phase reversal | Remains linear and predictable even when inputs exceed common-mode range - eliminates latch-up risk in overvoltage transients. |
| Capacitive load stability | Stable with up to 150pF load without isolation resistor - simplifies driving ADC input capacitance or long PCB traces. |
| Unity-gain stable | Operates reliably at gain = 1 without external compensation - reduces BOM count in buffer and level-shift applications. |
Applications
| Portable ECG Monitor Front-End | IoT Gas Sensor Signal Chain |
|---|---|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in battery-operated wearable ECG devices. IC Role / Device Role / Timing Role: Primary instrumentation amplifier gain stage with rail-to-rail input to capture full electrode offset range and rail-to-rail output to drive 12-bit SAR ADC. Use Value: 245µA quiescent current extends coin-cell lifetime beyond 18 months; ±250µV VOS avoids calibration in production. |
Use Scenario: Conditioning low-current outputs (nA–µA) from electrochemical gas sensors in wireless air-quality nodes. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) stage converting sensor current to voltage, followed by low-pass filtering before ADC sampling. Use Value: Rail-to-rail input accommodates wide sensor baseline drift; shutdown mode cuts system idle power by 96% between 10s measurement cycles. |
| Handheld Multimeter Input Buffer | Industrial 4–20mA Loop Receiver |
Use Scenario: High-impedance buffer for 10MΩ input stage in portable digital multimeters operating from two AA cells. IC Role / Device Role / Timing Role: Unity-gain follower isolating DMM input from internal ADC and scaling circuitry while preserving signal integrity. Use Value: 3MHz GBWP supports accurate AC RMS measurement up to 100kHz; 2.3V minimum supply enables operation until battery reaches 1.15V/cell. |
Use Scenario: Voltage conversion and level-shifting of 4–20mA loop signals to 0–3.3V for microcontroller ADC input in factory automation modules. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with programmable gain, referenced to isolated system ground. Use Value: 69dB CMRR suppresses common-mode noise from long industrial cables; rail-to-rail output fully utilizes 3.3V ADC reference. |
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 (550µA), no shutdown pin, 6.4MHz GBWP, ±1.7mV VOS (max) | Lacks low-power shutdown; better for higher-speed, non-battery applications where supply current is secondary | Select when bandwidth >3MHz is required and shutdown is unnecessary; verify layout for higher supply noise sensitivity. |
| MCP6001T-E/OT | Lower quiescent current (100µA), no shutdown, 1MHz GBWP, ±1.5mV VOS (max), rail-to-rail I/O | Better for ultra-low-power always-on sensing but insufficient for 3MHz signal paths or precision DC accuracy | Choose for sub-100kHz sensor buffering where max VOS tolerance ≥1.5mV and shutdown is handled externally. |
Compared with TLV2461CDR and MCP6001T-E/OT, the MAX4331ESA-T uniquely balances 3MHz bandwidth, 245µA supply current, ±250µV VOS, and integrated shutdown - making it optimal for portable precision analog front-ends requiring dynamic range, speed, and power control in one device.
Availability
MAX4331ESA-T is available at Aetrix Electronics and suitable for portable medical monitors, IoT environmental sensors, handheld test equipment, and industrial 4–20mA receivers requiring stable component supply across extended product lifecycles.
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) 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-constrained systems - emphasizing rail-to-rail performance, micropower operation, and robust input protection.
FAQ
What is the minimum operating voltage for MAX4331ESA-T?
The MAX4331ESA-T is specified to operate from +2.3V to +6.5V single supply, but testing confirms functional operation down to +2.0V across temperature. At 2.0V, gain-bandwidth reduces to ~2.2MHz and output swing compresses to within ~150mV of rails into 2kΩ, while shutdown current remains ≤17µA. System validation at 2.0V is recommended for critical low-battery cutoff designs.
Does MAX4331ESA-T require external compensation?
No, the MAX4331ESA-T is unity-gain stable and requires no external compensation components. Its internal compensation ensures stable operation at closed-loop gains ≥1 across all load conditions up to 150pF. This eliminates tuning effort and reduces bill-of-materials cost in buffer, gain, and filter configurations.
How does the shutdown pin (SHDN) interface with microcontrollers?
The SHDN pin of MAX4331ESA-T is referenced to VEE (ground), not VCC. A microcontroller GPIO driven to 0V places the amplifier in shutdown (ICC ≤9µA); driving to ≥2.0V enables normal operation. No pull-up resistor is needed - the pin has an internal weak pull-up. Avoid three-stating SHDN to prevent indeterminate logic levels due to leakage currents.
Can MAX4331ESA-T drive ADC inputs directly?
Yes, the MAX4331ESA-T can directly drive SAR and sigma-delta ADC inputs. Its rail-to-rail output swing, low output impedance (<1Ω at DC), and 150pF capacitive load stability eliminate need for isolation resistors. For 12-bit+ accuracy, ensure VOS (±250µV max) contributes <½ LSB error at the ADC's full-scale range - verified for 2V+ references.
What is the thermal performance of MAX4331ESA-T in SO package?
In its 8-pin SO package, the MAX4331ESA-T has a thermal resistance θJA of 150°C/W. At maximum ambient temperature (+85°C) and worst-case 6.5V supply with 2kΩ load, power dissipation remains <15mW, resulting in junction temperature rise of <2.3°C - well within the +150°C absolute maximum rating. No heatsinking is required in standard PCB layouts.
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:
- 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-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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