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Analog Devices Inc./Maxim Integrated MAX4237BEUA+
- Part No.:
- MAX4237BEUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4237BEUA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,582
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Product details
Overview
The MAX4237BEUA+ 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 +3V/+5V systems. It features 7.5MHz gain-bandwidth product (AV ≥ 5V/V), 1pA input bias current, 200µV max input offset voltage at +25°C (Grade B), and shutdown mode reducing quiescent current to 0.1µA - enabling use in battery-powered instrumentation and electrochemical sensor front-ends.
For engineers reviewing the MAX4237BEUA+ datasheet, MAX4237BEUA+ pinout, MAX4237BEUA+ application, or MAX4237BEUA+ equivalent, key selection criteria include guaranteed minimum closed-loop gain of 5V/V, µMAX-8 package compatibility with space-constrained PCBs, rail-to-rail output swing into 1kΩ, and ground-sensing input common-mode range extending to VEE − 0.15V.
Technical Context
The MAX4237BEUA+ 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 strain gauge amplifiers. Its architecture supports stable operation only at closed-loop gains ≥5V/V, distinguishing it from the unity-gain-stable MAX4236 variant.
It integrates a dedicated SHDN pin that forces output into high-impedance state and reduces supply current to ≤0.1µA, with 4µs recovery time. Input common-mode range spans from VEE − 0.15V to VCC − 1.2V, and output swings within 150mV of rails into 1kΩ - critical for maximizing dynamic range in 3V/5V single-supply designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 7.5MHz - enables stable closed-loop amplification at gain ≥5V/V with bandwidth up to ~1.5MHz |
| Input Offset Voltage (max) | 200µV at +25°C (Grade B) - sets baseline DC error floor in precision DC-coupled stages |
| Offset Voltage Drift (max) | 4.5µV/°C - limits thermal-induced drift in industrial temperature ranges (−40°C to +85°C) |
| Input Bias Current | 1pA - preserves signal integrity in high-Z sources (e.g., piezoelectric sensors, pH electrodes) |
| Quiescent Supply Current | 350µA (normal mode); 0.1µA (shutdown) - supports ultra-low-power wake-on-event architectures |
| Rail-to-Rail Output Swing | Within 150mV of VCC/VEE into 1kΩ - maximizes usable output voltage range on 3V/5V supplies |
| Capacitive Load Drive | Stable with up to 200pF - accommodates PCB trace capacitance and filtering without oscillation |
Pinout & Package
The MAX4237BEUA+ is housed in an 8-pin µMAX package (pin-compatible with SO-8), measuring 3mm × 3mm × 0.8mm with exposed pad for thermal enhancement. This compact, surface-mount package supports high-density layouts in portable and sensor-integrated systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier Output | Delivers rail-to-rail voltage swing; high-impedance during shutdown |
| 2 (VEE) | Negative Power Supply | Connect to GND in single-supply operation; bypass with 0.1µF capacitor |
| 3 (IN+) | Noninverting Input | High-impedance CMOS node; accepts signals down to VEE − 0.15V |
| 4 (IN−) | Inverting Input | Differential pair input; matched to IN+ for common-mode rejection |
| 5 (N.C.) | No Connection | Not internally bonded; must remain unconnected |
| 6 (SHDN) | Shutdown Control | Active-low logic input; pulls output high-Z and cuts ICC to ≤0.1µA when low |
| 7 (N.C.) | No Connection | Not internally bonded; must remain unconnected |
| 8 (VCC) | Positive Power Supply | Accepts +2.4V to +5.5V; bypass with 0.1µF capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1pA enables direct interfacing with high-impedance transducers (e.g., piezoelectric, electrochemical) without signal degradation |
| Ground-sensing input stage | Common-mode range includes VEE − 0.15V, allowing accurate amplification of signals referenced to system ground in single-supply configurations |
| Shutdown mode with high-Z output | Reduces system power by >99.9% while isolating downstream circuitry - essential for multi-channel sensor arrays |
| Rail-to-rail output swing into 1kΩ | Delivers full 0–VCC dynamic range for ADC drivers and analog signal chains operating on 3V/5V rails |
| Guaranteed stability at AV ≥ 5V/V | Eliminates need for external compensation in fixed-gain instrumentation amplifier topologies |
Applications
| Strain Gauge Signal Conditioning | Piezoelectric Sensor Interface |
|---|---|
Use Scenario: Amplifying low-level mV-level differential outputs from Wheatstone bridge-based load cells in industrial weighing systems. IC Role / Device Role / Timing Role: Precision DC-coupled difference amplifier with low offset drift and high CMRR to reject bridge excitation noise and thermal errors. Use Value: 200µV max VOS and 4.5µV/°C TCVOS ensure <±0.02% FS error over −40°C to +85°C, meeting Class III legal-for-trade accuracy requirements. | Use Scenario: Charge-to-voltage conversion for vibration sensing using ceramic piezoelectric elements in predictive maintenance modules. IC Role / Device Role / Timing Role: Ultra-high-impedance transimpedance amplifier front-end minimizing required feedback capacitance and preserving signal-to-noise ratio. Use Value: 1pA IB allows use of sub-10pF feedback caps, reducing low-frequency cutoff and avoiding noise amplification from larger capacitors. |
| Electrochemical Sensor Front-End | Battery-Powered Portable Instrumentation |
Use Scenario: Amplifying nanoamp-level currents from pH, dissolved oxygen, or glucose sensors in handheld analyzers. IC Role / Device Role / Timing Role: Low-noise, low-drift transimpedance amplifier with shutdown control synchronized to measurement duty cycle. Use Value: 0.2µVp-p (0.1–10Hz) input noise and 0.1µA shutdown current extend 2xAA battery life to >12 months in intermittent-read applications. | Use Scenario: Signal conditioning in handheld multimeters or environmental data loggers powered by coin-cell batteries. IC Role / Device Role / Timing Role: Rail-to-rail I/O op amp driving 12-bit SAR ADC inputs while operating from 3V supply with minimal headroom loss. Use Value: Output swing within 150mV of rails ensures full-scale utilization of 3V ADC reference, improving effective resolution by ≥½ LSB. |
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 VOS (A-grade), 0.1µV/°C drift, but higher 1/f noise and 17µA ICC | Better DC accuracy but unsuitable for low-noise AC-coupled piezo sensing due to chopper ripple | Select for ultra-low-drift DC applications where 1/f noise is not critical; avoid for sensor charge amplification |
| LTC2050CS5#TRMPBF | Zero-drift design; 3µV max VOS, 0.015µV/°C drift, 1.5mA ICC, SO-8 package | Superior long-term stability but 4× higher supply current limits battery life in portable devices | Prefer for lab-grade instrumentation requiring ppm-level stability; not optimal for energy-constrained edge nodes |
Compared with OPA333AIDBVR and LTC2050CS5#TRMPBF, the MAX4237BEUA+ delivers best-in-class trade-off between ultra-low input bias current (1pA), moderate DC precision (200µV VOS), and ultra-low shutdown current (0.1µA), making it uniquely suited for battery-powered, high-impedance sensor front-ends where chopper noise and quiescent power are decisive constraints.
Availability
The MAX4237BEUA+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, electrochemical sensor interfaces, and piezoelectric transducer signal conditioning requiring stable component supply across industrial temperature grades and long production lifecycles.
Supply support for MAX4237BEUA+ 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 MAX4236/MAX4237 family was engineered specifically for high-accuracy, low-power signal conditioning in single-supply sensor interfaces - emphasizing ground-sensing inputs, rail-to-rail outputs, and shutdown capability for portable and remote measurement systems.
FAQ
What is the minimum stable closed-loop gain for the MAX4237BEUA+?
The MAX4237BEUA+ is specified for stable operation only at closed-loop gains greater than or equal to 5V/V. Attempting unity-gain or gain-of-2 configurations may cause peaking or oscillation. For unity-gain applications, the pin-compatible MAX4236BEUA+ should be selected instead. This gain restriction is inherent to the internal compensation and must be respected in all MAX4237BEUA+ designs.
Does the MAX4237BEUA+ support true single-supply operation with input signals at ground potential?
Yes. The MAX4237BEUA+ features ground-sensing inputs with a common-mode range extending to VEE − 0.15V. When VEE is connected to GND (single-supply mode), the input can accept signals down to −0.15V - effectively enabling accurate amplification of signals referenced to system ground. This eliminates the need for level-shifting circuitry in many sensor interface applications.
What is the maximum capacitive load the MAX4237BEUA+ can drive without instability?
The MAX4237BEUA+ is characterized for stable operation with capacitive loads up to 200pF, as verified in the datasheet's "Capacitive Load Stability" specification. This includes PCB trace capacitance, filter networks, and ADC input capacitance. Driving loads exceeding 200pF requires external isolation resistance or careful layout to maintain phase margin and prevent ringing in the MAX4237BEUA+ output.
How does the shutdown function affect the output state of the MAX4237BEUA+?
When the SHDN pin is pulled low, the MAX4237BEUA+ disables its internal circuitry and forces the output into a high-impedance (Hi-Z) state - electrically disconnecting it from the load. This prevents loading of downstream circuitry and avoids contention in multiplexed or shared-bus configurations. The output remains Hi-Z until SHDN is returned high, with a typical recovery time of 4µs before normal amplification resumes.
Is the MAX4237BEUA+ compatible with standard SO-8 footprints?
Yes. The MAX4237BEUA+ uses the µMAX-8 package, which shares identical pinout, pad layout, and mechanical dimensions with industry-standard SO-8 packages. It is fully compatible with SO-8 reflow profiles and pick-and-place equipment, enabling drop-in replacement in existing SO-8 designs without PCB revision - provided thermal and electrical validation confirms performance equivalence under target operating conditions.
MAX4237BEUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- 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:
- 30 mA
- 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
MAX4237BEUA+ FAQ
1.How can I place an order for MAX4237BEUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4237BEUA+ 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 MAX4237BEUA+ reliable?
The price and inventory of MAX4237BEUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4237BEUA+ is usually 5 days.
3.What payment methods are accepted for MAX4237BEUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4237BEUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4237BEUA+?
MAX4237BEUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4237BEUA+ 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 MAX4237BEUA+?
For technical support, including MAX4237BEUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4237BEUA+ requirements.
6.How does Aetrix verify that MAX4237BEUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4237BEUA+ 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 MAX4237BEUA+ meets industry standards.
7.What is the process for return or replacement of MAX4237BEUA+?
All MAX4237BEUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4237BEUA+, 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 MAX4237BEUA+ part is unused and in its original packaging.
Return procedure for MAX4237BEUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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