Analog Devices Inc./Maxim Integrated MAX4237BESA-T

Overview

MAX4237BESA-T 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, 50µV max input offset voltage at +25°C (Grade B), and shutdown mode reducing quiescent current to 0.1µA - ideal for battery-powered instrumentation and electrochemical sensor front-ends.

For engineers reviewing the MAX4237BESA-T datasheet, MAX4237BESA-T pinout, MAX4237BESA-T application, or MAX4237BESA-T equivalent, this page delivers verified specifications, SO-8 package terminal mapping, real-world use cases in strain gauge and thermocouple amplification, and two validated alternative op amps with documented functional trade-offs.

Technical Context

The MAX4237BESA-T employs a CMOS input stage enabling ultra-low 1pA input bias current and ground-sensing operation (input common-mode range extends to VEE − 0.15V). Its internal compensation ensures stability only for closed-loop gains ≥ 5V/V, distinguishing it from the unity-gain-stable MAX4236 variant.

It delivers rail-to-rail output swing within 150mV of rails into 1kΩ, supports shutdown via logic-level SHDN pin (VIH = 0.7×VCC, VIL = 0.3×VCC), and maintains 110dB min open-loop gain (RL = 100kΩ) across −40°C to +85°C - critical for precision DC-coupled measurement paths.

Key Specifications

Pinout & Package

MAX4237BESA-T is housed in an 8-pin SO (SOIC-N) surface-mount package with standard 1.27mm pitch and 5.0mm × 6.2mm footprint. Pin 1 is marked by a beveled corner or dot; pins are numbered counterclockwise.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision, low-input-bias-current op amp applications.

Compared with OPA333AIDR and LTC2050CS8#PBF, the MAX4237BESA-T uniquely balances femtoampere input bias current with 7.5MHz bandwidth and SO-8 compatibility - making it the only choice among the three for high-impedance, moderate-speed, single-supply precision amplification.

Availability

MAX4237BESA-T is available at Aetrix Electronics and suitable for strain gauge signal conditioning, piezoelectric sensor amplification, and battery-powered portable instrumentation requiring stable component supply across extended temperature ranges.

Supply support for MAX4237BESA-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 industrial, medical, and communications applications.

The MAX4236/MAX4237 family was engineered specifically for high-accuracy, low-power, single-supply sensor signal conditioning - emphasizing ultra-low input bias current, rail-to-rail output, and ground-sensing capability in compact packages.

FAQ

What is the maximum stable closed-loop gain for MAX4237BESA-T?

The MAX4237BESA-T is internally compensated for stability only at closed-loop gains ≥ 5V/V. Attempting unity-gain or gain-of-2 configurations may cause oscillation or peaking. For lower-gain applications, the MAX4236 series (unity-gain stable, 1.7MHz GBWP) is the appropriate selection. Always verify phase margin with actual layout parasitics in final design.

Does MAX4237BESA-T support true rail-to-rail input common-mode range?

No - the MAX4237BESA-T supports ground-sensing input (common-mode range extends to VEE − 0.15V) but does not reach VCC − 1.2V on the high side. Its specified input common-mode range is (VEE − 0.15V) to (VCC − 1.2V), meaning it cannot accept inputs within 1.2V of the positive rail. This limitation must be considered when designing level-shifting or high-side sensing circuits.

How does the shutdown mode affect the output state of MAX4237BESA-T?

In shutdown mode (SHDN = VEE/GND), the MAX4237BESA-T disables its internal circuitry and forces the output into a high-impedance (tri-state) condition - neither sourcing nor sinking current. This allows safe connection to shared buses or multiplexed analog backplanes without loading adjacent channels. Recovery time to active operation is 4µs with RL = 1kΩ.

What is the guaranteed input offset voltage specification for MAX4237BESA-T over temperature?

The MAX4237BESA-T (Grade B, SO-8) guarantees ±340µV maximum input offset voltage across the full operating temperature range of −40°C to +85°C. At +25°C, the limit is tighter: ±50µV max. These values are production-tested per Maxim's datasheet revision 0 (2001), and apply specifically to the SO-8 package variant.

Can MAX4237BESA-T drive a 1000pF capacitive load?

No - the MAX4237BESA-T is characterized for stable operation with up to 200pF capacitive load (no sustained oscillations). Driving 1000pF directly will likely cause severe ringing or instability. To interface with heavy capacitive loads, add a series isolation resistor (e.g., 100Ω–500Ω) between the MAX4237BESA-T output and the load, or use a dedicated buffer stage.