Analog Devices Inc./Maxim Integrated MAX6143AASA25+

Overview

The MAX6143AASA25+ from Maxim Integrated is a high-precision, low-noise voltage reference with integrated temperature-sensing output (TEMP), delivering a factory-trimmed +2.500V output with ±0.06% initial accuracy, 3ppm/°C max temperature coefficient over –40°C to +125°C, and 3.8µV_P-P (0.1Hz–10Hz) noise - enabling use in 16-bit+ data acquisition systems requiring stable excitation for precision A/D and D/A converters.

For engineers reviewing the MAX6143AASA25+ datasheet, MAX6143AASA25+ pinout, MAX6143AASA25+ application, or MAX6143AASA25+ equivalent, key selection considerations include its dual-function TEMP output (570mV @ 25°C, 1.9mV/°C), TRIM-adjustable output (±3% to ±6%), active-low shutdown (0.01µA), and stability without output bypass capacitors - critical for space-constrained, battery-powered, or automotive-grade sensor signal chains.

Technical Context

The MAX6143AASA25+ employs bandgap-based architecture with proprietary curvature-correction circuitry and laser-trimmed thin-film resistors to achieve ultra-low drift and tight initial tolerance. Its internal TEMP output is derived directly from die temperature via a calibrated linear transducer, not a digital sensor or ADC.

It features a dedicated TRIM terminal allowing analog fine-tuning of V_OUT using an external resistive divider, and an active-low SHDN input that disables the reference core while preserving bias for fast wake-up (150µs turn-on settling). No output capacitor is required for stability, and it remains stable with up to 100µF capacitive loads.

Key Specifications

Pinout & Package

MAX6143AASA25+ is housed in an 8-pin SOIC (SO) package (JEDEC MS-012AA, 3.9mm × 4.9mm body, 1.27mm pitch). Pins 1 and 8 are internally connected and must remain unconnected on PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5025IDR and ADR4525BRZ, the MAX6143AASA25+ uniquely integrates a calibrated analog temperature transducer and operates stably without any output capacitor - reducing component count and PCB area while maintaining competitive accuracy and noise performance in automotive and portable designs.

Availability

MAX6143AASA25+ is available at Aetrix Electronics and suitable for high-resolution data acquisition, automotive sensor signal conditioning, and industrial process monitoring requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6143AASA25+ 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 demanding applications in automotive, industrial, communications, and computing markets.

The MAX6143AASA25+ belongs to Maxim's precision voltage reference family engineered for systems needing simultaneous high-accuracy reference and on-chip temperature telemetry - targeting automotive ECUs, portable test gear, and ruggedized industrial sensors.

FAQ

What is the guaranteed initial accuracy of the MAX6143AASA25+?

The MAX6143AASA25+ has a guaranteed initial output voltage accuracy of ±0.06% at +25°C, meaning its 2.500V output falls within 2.4985V to 2.5015V under no-load conditions at room temperature. This specification is production-tested and applies across the full –40°C to +125°C operating range per the datasheet's "MAX6143A_25" grade definition.

Does the MAX6143AASA25+ require an output bypass capacitor for stability?

No, the MAX6143AASA25+ does not require an output bypass capacitor for stability. It is explicitly designed to be stable with 0–100µF capacitive loads, eliminating the need for external output capacitance - a key advantage for space-constrained or high-reliability applications where capacitor aging or failure must be avoided.

How is the TEMP output of the MAX6143AASA25+ calibrated and what does it represent?

The TEMP output of the MAX6143AASA25+ is a linear analog voltage proportional to the silicon die temperature: 570mV at +25°C with a slope of 1.9mV/°C. It represents junction temperature directly (not ambient), and its calibration is factory-trimmed - no external calibration is needed. Self-heating effects must be accounted for in high-power applications.

What is the maximum load current the MAX6143AASA25+ can source or sink?

The MAX6143AASA25+ can source up to 30mA and sink up to 2mA of load current while maintaining specified accuracy and regulation. Sourcing capability supports driving ADC reference inputs, op-amp buffers, or small DACs directly; sinking capability accommodates light reverse-current conditions in certain feedback configurations.

Can the output voltage of the MAX6143AASA25+ be adjusted, and how?

Yes, the MAX6143AASA25+ output voltage can be trimmed using the TRIM pin. Connect a resistive divider (e.g., 50kΩ potentiometer) between OUT and GND, with its wiper connected to TRIM. This allows ±3% to ±6% adjustment of the 2.500V output, enabling fine calibration without modifying the main feedback network.