Analog Devices Inc./Maxim Integrated MAX6037CAUK33+T

Overview

MAX6037CAUK33+T from Maxim Integrated is a precision, low-dropout, micropower voltage reference IC with fixed 3.3V output, ±0.5% initial accuracy (Grade C), 50ppm/°C max temperature coefficient, and active-low shutdown consuming ≤500nA. It operates from 3.5V to 5.5V supply, delivers ±5mA load current, and targets high-accuracy analog front-ends in battery-powered instrumentation.

For engineers reviewing the MAX6037CAUK33+T datasheet, MAX6037CAUK33+T pinout, MAX6037CAUK33+T application, or MAX6037CAUK33+T equivalent, key selection criteria include its automotive-grade -40°C to +125°C operation, 100mV dropout at 1mA, 0.02µF–1µF capacitive-load stability, and SOT23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX6037CAUK33+T implements a series-mode bandgap reference architecture with integrated shutdown control logic. Its output is stabilized by internal compensation, enabling stable regulation across 0.02µF to 1µF output capacitance without external components.

It features rail-to-rail sourcing/sinking capability up to ±5mA, a 2.5V–5.5V input range (minimum VIN = VOUT + 0.2V), and logic-level SHDN input with V_ENL ≤ 0.8V and V_ENH ≥ 2.0V - compatible with standard CMOS I/O interfaces.

Key Specifications

Pinout & Package

The MAX6037CAUK33+T is housed in a 5-pin SOT23-5 package (package code U5-2, top mark AEJG), with exposed pad not electrically connected. Pin 1 is ADJ (internally connected, no external connection required for fixed-output variants).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage reference applications.

Compared with REF3333AIDBVR and ADR3433ARJZ-R7, the MAX6037CAUK33+T uniquely integrates sub-500nA shutdown in a 5-pin SOT23 while maintaining automotive temperature range and 3.3V precision - making it optimal for space- and power-constrained embedded systems requiring autonomous low-power states.

Availability

MAX6037CAUK33+T is available at Aetrix Electronics and suitable for portable medical devices, wireless sensor networks, and automotive cabin electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6037CAUK33+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, automotive, and medical applications.

The MAX6037 family was engineered to deliver high-accuracy, low-power voltage references in miniature packages for battery-operated and thermally challenging systems - emphasizing shutdown efficiency, wide input range, and robust capacitive-load tolerance.

FAQ

What is the minimum input voltage required for stable operation of the MAX6037CAUK33+T?

The MAX6037CAUK33+T requires a minimum input voltage of 3.5V, defined as V_OUT + 0.2V per datasheet specifications. Below this threshold, regulation degrades and dropout increases nonlinearly. At 3.5V input, the device maintains full 3.3V output with ≤100mV dropout at 1mA load, ensuring reliable operation in margin-constrained 3.3V system rails.

Does the MAX6037CAUK33+T require an external output capacitor, and what value range is supported?

Yes, the MAX6037CAUK33+T requires an external output capacitor for stability, with a validated range of 0.02µF to 1µF. Ceramic capacitors are recommended for lowest ESR; values within this range prevent oscillation and suppress broadband noise. Using <0.02µF risks instability, while >1µF may increase turn-on settling time but does not harm functionality.

How does the shutdown functionality of the MAX6037CAUK33+T behave during power-up sequences?

During power-up, the MAX6037CAUK33+T remains disabled until SHDN rises above 2.0V (VENH). If SHDN is tied to IN, the device enables only after VIN reaches ~2.0V - preventing premature reference activation. Turn-on settling time is 2.4ms to 0.1% of final value with C_OUT = 0.02µF, ensuring clean reference establishment before ADC sampling begins.

Can the MAX6037CAUK33+T drive a 10kΩ load directly, and what is the resulting output voltage error?

Yes, the MAX6037CAUK33+T can drive a 10kΩ load (330µA at 3.3V) with minimal error. Load regulation is specified at ≤0.027%/mA for sourcing; at 330µA, this yields <9µV deviation - well within ±0.5% initial accuracy. No additional buffering is needed for typical microcontroller ADC reference inputs or op-amp bias networks.

Is the MAX6037CAUK33+T pin-compatible with other members of the MAX6037 family, such as the MAX6037AAUK33+T?

Yes, all MAX6037 variants including MAX6037CAUK33+T share identical 5-pin SOT23-5 pinout and footprint (U5-2 package). The only differences are grade-specific parameters: initial accuracy (±0.5% for 'C' vs. ±0.2% for 'A'), tempco (50ppm/°C vs. 25ppm/°C), and top-mark codes (AEJG vs. AEJC). PCB design can accommodate any MAX6037_33 variant without layout change.