Analog Devices Inc./Maxim Integrated MAX6129AEUK30+T

Overview

The MAX6129AEUK30+T from Maxim Integrated is a micropower, low-dropout series-mode bandgap voltage reference delivering a precise 3.000V output with ±0.4% initial accuracy and 40ppm/°C max temperature coefficient. It operates from 3.2V to 12.6V supply, draws only 6.75µA (max) quiescent current, and sustains 4mA source / 1mA sink load current-ideal for precision A/D converters and battery-powered handheld instruments.

For engineers reviewing the MAX6129AEUK30+T datasheet, MAX6129AEUK30+T pinout, MAX6129AEUK30+T application, or MAX6129AEUK30+T equivalent, key selection criteria include ultra-low supply current, guaranteed dropout ≤200mV at 4mA, stability with 0–10µF capacitive loads, and SOT23-5 package compatibility in space-constrained designs.

Technical Context

This series-mode reference uses an internal compensated bandgap core, eliminating external compensation components while ensuring stability across 0–10µF output capacitance. Its BiCMOS process enables ultra-low 6.75µA supply current with only 1.5µA/V variation over input voltage range.

Designed for high-accuracy analog signal chains, it delivers 0.1% turn-on settling in ≤775µs and maintains output regulation within 0.6µV/µA load change (source) and 6.5µV/µA (sink), supporting precision data acquisition systems requiring long-term drift <150ppm over 1000 hours.

Key Specifications

Pinout & Package

MAX6129AEUK30+T is housed in a 5-pin SOT23-5 surface-mount package (70% smaller than SO-8), with exposed pad not connected. Pin 1 = IN (supply input), Pin 2 = GND, Pins 3–4 = N.C. (internally connected; leave unconnected or tie to GND), Pin 5 = OUT (3.000V reference output).

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3030AIDBZR and ADR3430ARJZ-R7, the MAX6129AEUK30+T uniquely balances ultra-low 6.75µA supply current, 4mA source/1mA sink drive, and unconditional stability with 0–10µF loads-making it optimal for battery-critical, space-constrained, and dynamically loaded precision systems.

Availability

MAX6129AEUK30+T is available at Aetrix Electronics and suitable for battery-powered handheld instruments, precision A/D converters, and portable medical sensors requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6129AEUK30+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 MAX6129 family targets ultra-low-power, high-accuracy voltage references for portable and energy-harvesting systems where supply current, size, and thermal drift are critical constraints.

FAQ

What is the maximum load current the MAX6129AEUK30+T can source and sink?

The MAX6129AEUK30+T can source up to 4mA and sink up to 1mA of load current while maintaining output regulation within specified limits. This dual-direction capability allows it to drive both sourcing and sinking loads-such as ADC reference inputs and op-amp bias networks-without external buffers. The MAX6129AEUK30+T achieves this with only 6.75µA quiescent supply current, making it highly efficient for dynamic load scenarios.

Does the MAX6129AEUK30+T require external capacitors for stability?

No, the MAX6129AEUK30+T does not require external compensation capacitors due to its internally compensated bandgap architecture. It remains stable driving capacitive loads from 0 to 10µF when sourcing current and up to 0.4µF when sinking current. An optional 0.1µF ceramic input capacitor improves transient response but is not necessary for stability. This eliminates layout dependencies and reduces BOM count for the MAX6129AEUK30+T.

What is the dropout voltage specification for the MAX6129AEUK30+T?

The MAX6129AEUK30+T has a maximum dropout voltage of 200mV at 4mA output current, meaning it regulates properly down to VIN = 3.2V (3.0V + 0.2V). At zero load, dropout is as low as 140mV. This low dropout enables reliable operation from tightly regulated 3.3V rails or aging batteries, preserving headroom in low-voltage systems. The MAX6129AEUK30+T maintains this performance across its full -40°C to +85°C operating range.

How accurate is the MAX6129AEUK30+T over temperature?

The MAX6129AEUK30+T (Grade A) guarantees ±0.4% initial accuracy at +25°C and a maximum temperature coefficient of 40ppm/°C over -40°C to +85°C. This results in a total output variation of ≤±1.2mV across the full temperature range-sufficient for 12-bit absolute accuracy without calibration. Long-term stability is rated at 150ppm over 1000 hours, and thermal hysteresis is limited to 140ppm, ensuring repeatable performance in cyclic environments for the MAX6129AEUK30+T.

What package type and pin configuration does the MAX6129AEUK30+T use?

The MAX6129AEUK30+T uses a 5-pin SOT23-5 surface-mount package with top marking "ADRQ". Pin 1 is IN (supply input), Pin 2 is GND, Pins 3 and 4 are no-connect (internally tied; leave floating or tie to GND), and Pin 5 is OUT (3.000V reference output). The package occupies 70% less board area than comparable SO-8 voltage references, enabling compact designs for portable equipment using the MAX6129AEUK30+T.