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Analog Devices Inc./Maxim Integrated MAX4237AEUA+
- Part No.:
- MAX4237AEUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4237AEUA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,470
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Product details
Overview
The MAX4237AEUA+ from Maxim Integrated is a high-precision, rail-to-rail output operational amplifier optimized for low-noise, low-input-bias-current signal conditioning in single-supply systems. It features 20µV max input offset voltage (Grade A), 2µV/°C max offset drift, 1pA input bias current, 7.5MHz gain-bandwidth product (for closed-loop gain ≥5V/V), and shutdown mode reducing quiescent current to 0.1µA - enabling use in battery-powered instrumentation and electrochemical sensor front-ends.
For engineers reviewing the MAX4237AEUA+ datasheet, MAX4237AEUA+ pinout, MAX4237AEUA+ application, or MAX4237AEUA+ equivalent, key selection criteria include guaranteed Grade A offset performance at +25°C, stability at AV ≥5V/V, µMAX-8 package compatibility with space-constrained PCB layouts, and rail-to-rail output swing into 1kΩ loads under +3V/+5V supplies.
Technical Context
The MAX4237AEUA+ employs a CMOS input stage delivering ultra-low input bias current (1pA) and low voltage noise (14nV/√Hz), making it suitable for high-impedance sensor interfaces like piezoelectric and electrochemical transducers. Its ground-sensing input extends to VEE − 0.15V, while rail-to-rail output swings within 150mV of both rails into 1kΩ - preserving dynamic range in low-voltage systems.
This device operates from +2.4V to +5.5V single supply (or ±1.2V to ±2.75V dual supply), with PSRR of 95dB (min) and CMRR of 80dB (min) over −40°C to +85°C. The shutdown function asserts high-impedance output and reduces ICC to ≤2µA, with 4µs recovery time - supporting power-gated precision analog stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.4V to +5.5V - supports direct interface with Li-ion, 3.3V, and 5V logic domains without level-shifting. |
| Input Offset Voltage (Grade A) | 20µV max at +25°C - enables sub-100ppm accuracy in 12-bit+ measurement systems without trimming. |
| Offset Voltage Drift | 2µV/°C max - ensures <±160µV total drift over −40°C to +85°C, critical for uncalibrated industrial sensors. |
| Gain-Bandwidth Product | 7.5MHz - delivers stable operation at closed-loop gains ≥5V/V, suitable for anti-aliasing filters and fast-settling amplifiers. |
| Input Bias Current | 1pA max - minimizes voltage error across high-value feedback networks (>10MΩ) and preserves sensor charge integrity. |
| Rail-to-Rail Output Swing | Within 150mV of rails into 1kΩ - maximizes usable output range in +3V systems, improving ADC utilization efficiency. |
| Shutdown Quiescent Current | 0.1µA max - extends battery life in intermittent-sampling applications such as portable gas analyzers or data loggers. |
Pinout & Package
The MAX4237AEUA+ is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), compatible with SO-8 footprints but with reduced board area. Pin 1 is OUT; Pin 2 is VEE (GND in single-supply); Pin 3 is IN+; Pin 4 is IN−; Pin 5 is SHDN; Pin 6 is VCC; Pins 1 and 5 are NC in SO-8 variant but internally connected per µMAX pinout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Amplifier output | Delivers rail-to-rail voltage swing into 1kΩ; high-impedance state during shutdown. |
| VEE (Pin 2) | Negative supply / GND reference | Accepts 0V in single-supply; input common-mode extends to VEE − 0.15V for ground-sensing capability. |
| IN+ (Pin 3) | Noninverting input | CMOS input with 1pA bias current; requires guarding in >100MΩ impedance circuits. |
| IN− (Pin 4) | Inverting input | Matches IN+ characteristics; used for precision differential or transimpedance configurations. |
| SHDN (Pin 5) | Active-low shutdown control | Pull to VEE (GND) to enter shutdown; VIH = 0.7×VCC, VIL = 0.3×VCC - compatible with 3.3V/5V GPIO. |
| VCC (Pin 6) | Positive supply input | Bypass with 0.1µF ceramic capacitor near pin; supports operation down to +2.4V for brownout resilience. |
| NC (Pins 7, 8) | No connection | Not internally bonded; must remain unconnected to avoid parasitic coupling or ESD path disruption. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low offset voltage grade | 20µV max at +25°C (Grade A) - eliminates need for external nulling in strain gauge bridges and thermocouple amplifiers. |
| Ground-sensing input stage | Common-mode range includes VEE − 0.15V - enables direct interfacing to sensors referenced to system ground without level shifters. |
| Capacitive load drive | Stable with up to 200pF load - supports direct driving of ADC input capacitors or long PCB traces without isolation resistors. |
| Low-frequency noise performance | 0.2µVp-p (0.1Hz–10Hz) - critical for DC-coupled electrochemical sensors where 1/f noise dominates measurement uncertainty. |
| High open-loop gain | 110dB min (RL = 100kΩ) - ensures <0.01% gain error in unity-gain buffer or high-precision instrumentation amplifier topologies. |
Applications
| Strain Gauge Signal Conditioning | Piezoelectric Sensor Interface |
|---|---|
Use Scenario: Amplifying mV-level Wheatstone bridge outputs from metal foil or semiconductor strain gauges in load cells and pressure transducers. IC Role / Device Role / Timing Role: Precision noninverting amplifier with matched input impedance and ultra-low bias current to prevent bridge imbalance errors. Use Value: 20µV offset and 2µV/°C drift ensure <±0.1% full-scale error over temperature without calibration - reducing BOM cost and test time. |
Use Scenario: Charge-to-voltage conversion for piezoelectric accelerometers and acoustic emission sensors generating high-impedance, low-charge signals. IC Role / Device Role / Timing Role: Low-bias-current transimpedance amplifier with rail-to-rail output to maximize dynamic range from ±5V excitation sources. Use Value: 1pA input bias current allows use of minimal feedback capacitance (<100pF), preserving bandwidth and minimizing thermal noise contribution. |
| Thermocouple Amplification | Battery-Powered Electrochemical Sensors |
Use Scenario: Cold-junction compensation and linearization of K-type or J-type thermocouples in portable temperature recorders. IC Role / Device Role / Timing Role: High-PSRR (95dB min), high-CMRR (80dB min) instrumentation front-end rejecting supply ripple and EMI in noisy industrial environments. Use Value: 7.5MHz GBWP enables fast settling (<1µs to 0.01%) for multiplexed thermocouple arrays, improving channel throughput in data acquisition systems. |
Use Scenario: Amperometric detection in handheld blood glucose meters or environmental gas sensors using three-electrode electrochemical cells. IC Role / Device Role / Timing Role: Ultra-low-power, zero-drift transimpedance amplifier converting pA-level current from working electrodes into measurable voltage. Use Value: 0.1µA shutdown current extends coin-cell battery life to >2 years in devices sampling once per minute - meeting IEC 62304 Class B requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Chopper-stabilized architecture; 10µV max offset, 0.1µV/°C drift; higher 1/f noise (0.6µVp-p). | Superior DC accuracy but introduces switching artifacts; unsuitable for piezoelectric charge amplification. | Select when ultra-low drift dominates over noise spectral purity - e.g., precision voltage references or DC servo loops. |
| LTC2050CS5#TRMPBF | Zero-drift design; 3µV max offset, 0.015µV/°C drift; 1.5MHz GBWP; no shutdown pin. | Lacks integrated shutdown; lower bandwidth limits use in fast-settling multi-channel systems. | Prefer for highest DC precision in always-on instrumentation where layout space permits SOT-23-5 and external enable logic. |
Compared with OPA333AIDBVR and LTC2050CS5#TRMPBF, the MAX4237AEUA+ offers optimal balance of low offset (20µV), low drift (2µV/°C), 7.5MHz bandwidth, and integrated shutdown - uniquely suited for battery-powered, high-impedance sensor interfaces requiring both precision and power gating.
Availability
The MAX4237AEUA+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, electrochemical sensor modules, and precision industrial transducer signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4237AEUA+ 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 and mixed-signal ICs for precision, power, and interface applications in industrial, medical, and communications systems.
The MAX4236/MAX4237 family was engineered specifically for ultra-low-input-current, high-DC-accuracy signal conditioning - targeting sensor front-ends where offset, drift, and bias current directly limit resolution and calibration interval.
FAQ
What is the maximum input offset voltage specification for the MAX4237AEUA+ at +25°C?
The MAX4237AEUA+ is Grade A qualified with a maximum input offset voltage of 20µV at +25°C, tested and guaranteed across the full production lot. This specification is confirmed in the Electrical Characteristics table for µMAX-8 packages and applies specifically to the MAX4237AEUA+ ordering option - not the B-grade or SOT23 variants.
Does the MAX4237AEUA+ support single-supply operation, and what is its input common-mode range?
Yes, the MAX4237AEUA+ supports single-supply operation from +2.4V to +5.5V. Its input common-mode voltage range extends from VEE − 0.15V to VCC − 1.2V, enabling true ground-sensing capability - meaning it accepts inputs at or slightly below the negative rail (typically GND), which is essential for interfacing with grounded sensors like thermocouples or bridge circuits.
What is the gain-bandwidth product of the MAX4237AEUA+, and at what closed-loop gain is it stable?
The MAX4237AEUA+ has a gain-bandwidth product of 7.5MHz and is specified for stable operation only at closed-loop gains greater than or equal to 5V/V. Unlike the MAX4236 variant, it is not unity-gain stable - attempting unity-gain configuration may result in oscillation or degraded phase margin, as confirmed by the Absolute Maximum Ratings and Selector Guide tables.
How does the shutdown feature of the MAX4237AEUA+ behave electrically?
When the SHDN pin is pulled low (≤0.3×VCC), the MAX4237AEUA+ enters shutdown mode: quiescent current drops to ≤0.1µA, and the output transitions to a high-impedance state - neither sourcing nor sinking current. Recovery to active operation takes ≤4µs (measured at RL = 1kΩ), and the SHDN pin draws ≤3µA, allowing direct interface with microcontroller GPIOs without additional buffering.
Is the MAX4237AEUA+ pin-compatible with other packages in the MAX4236/MAX4237 family?
No - the MAX4237AEUA+ uses the 8-pin µMAX package with specific pin assignments (e.g., OUT on Pin 1, SHDN on Pin 5). It is not pin-compatible with the 6-pin SOT23-6 variant (MAX4237EUT-T) or the 8-pin SO package (MAX4237AESA), which have different pinouts (e.g., SHDN on Pin 8 in SO/µMAX, but Pin 5 in µMAX drawing). Layout reuse requires verification against the exact package drawing in the datasheet.
MAX4237AEUA+ 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:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1.3V/µs
- Gain Bandwidth Product:
- 7.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 5 µV
- Current - Supply:
- 350µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.4 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4237AEUA+ FAQ
1.How can I place an order for MAX4237AEUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4237AEUA+ 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 MAX4237AEUA+ reliable?
The price and inventory of MAX4237AEUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4237AEUA+ is usually 5 days.
3.What payment methods are accepted for MAX4237AEUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4237AEUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4237AEUA+?
MAX4237AEUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4237AEUA+ 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 MAX4237AEUA+?
For technical support, including MAX4237AEUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4237AEUA+ requirements.
6.How does Aetrix verify that MAX4237AEUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4237AEUA+ 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 MAX4237AEUA+ meets industry standards.
7.What is the process for return or replacement of MAX4237AEUA+?
All MAX4237AEUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4237AEUA+, 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 MAX4237AEUA+ part is unused and in its original packaging.
Return procedure for MAX4237AEUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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