Analog Devices Inc./Maxim Integrated MAX6143AASA25+T

Overview

The MAX6143AASA25+T from Maxim Integrated is a high-precision, low-noise voltage reference with integrated temperature sensor output. It delivers a factory-trimmed +2.5V reference (±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 converters. Its TEMP pin provides 570mV at +25°C with 1.9mV/°C slope for die-temperature monitoring.

For engineers reviewing the MAX6143AASA25+T datasheet, MAX6143AASA25+T pinout, MAX6143AASA25+T application, or MAX6143AASA25+T equivalent, key selection criteria include initial accuracy vs. temperature drift trade-offs, TRIM-adjustable output range (±3% to ±6%), shutdown current (0.01µA), and compatibility with capacitive loads up to 100µF without external compensation.

Technical Context

The MAX6143AASA25+T employs bandgap-based architecture with proprietary curvature-correction circuitry and laser-trimmed thin-film resistors to achieve ultra-low temperature drift. Its internal design integrates a precision reference core with a linear temperature transducer, enabling simultaneous high-accuracy voltage referencing and on-die thermal sensing.

It features active-low SHDN control, TRIM input for resistor-divider-based fine adjustment, and robust supply rejection (≥70dB up to 10kHz). The device operates from (V_OUT + 2V) to +40V input, sources up to 30mA, sinks 2mA, and requires no output bypass capacitor for stability-simplifying layout in space-constrained systems.

Key Specifications

Pinout & Package

MAX6143AASA25+T is housed in an 8-pin SOIC (SO) package (JEDEC MS-012, 3.9mm × 4.9mm), rated for –40°C to +125°C operation. Pins 1 and 8 are internally connected and must remain unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR4525BRZ and REF5025IDR, the MAX6143AASA25+T uniquely combines 30mA drive, integrated die-temperature sensing, and capacitor-free stability-making it optimal for compact, thermally adaptive embedded systems where BOM count and layout simplicity are critical.

Availability

MAX6143AASA25+T is available at Aetrix Electronics and suitable for high-resolution data acquisition, automotive engine control units, industrial process transmitters, and battery-powered IoT sensors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6143AASA25+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MAX6143 series was designed specifically for applications demanding simultaneous precision voltage referencing and on-die thermal monitoring-targeting high-bit-depth data converters, automotive ECUs, and ruggedized industrial instrumentation.

FAQ

What is the initial accuracy and temperature coefficient of the MAX6143AASA25+T?

The MAX6143AASA25+T has an initial accuracy of ±0.06% (2.4985V to 2.5015V at +25°C) and a maximum temperature coefficient of 3ppm/°C over the –40°C to +125°C range. These values are guaranteed by production testing and laser trimming, ensuring consistent performance in automotive and industrial environments where thermal stability is critical. The MAX6143AASA25+T achieves this using curvature-correction circuitry and thin-film resistors.

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

No, the MAX6143AASA25+T does not require an output bypass capacitor for stability. It is inherently stable with capacitive loads ranging from 0 to 100µF, eliminating the need for external compensation components. This feature reduces PCB area, lowers BOM cost, and improves reliability by removing capacitor-related failure modes-especially valuable in space-constrained or high-reliability applications where the MAX6143AASA25+T is deployed.

How does the TEMP output function on the MAX6143AASA25+T?

The TEMP pin on the MAX6143AASA25+T outputs a voltage proportional to die temperature: 570mV at +25°C with a slope of 1.9mV/°C. This linear transducer enables real-time monitoring of junction temperature without external sensors. Because the output is ratiometric and calibrated, it supports thermal compensation algorithms-for example, adjusting ADC gain or power stage bias in response to die heating-directly using the MAX6143AASA25+T's own TEMP signal.

What is the purpose of the TRIM pin on the MAX6143AASA25+T?

The TRIM pin on the MAX6143AASA25+T allows fine adjustment of the output voltage using an external resistive divider between OUT and GND. By connecting the divider's wiper to TRIM, users can tune V_OUT by ±3% to ±6% around the nominal +2.5V. This capability supports post-manufacturing calibration to correct for system-level gain errors or board-level tolerances-adding flexibility without requiring custom reference voltages or additional DACs in the MAX6143AASA25+T-based design.

What are the supply current and shutdown characteristics of the MAX6143AASA25+T?

The MAX6143AASA25+T draws a maximum of 450µA quiescent supply current at +25°C and reduces to just 0.01µA in shutdown mode (when SHDN is pulled low). This ultra-low shutdown current extends battery life significantly-enabling multi-year operation in intermittent-sampling IoT nodes. The active-low SHDN pin requires no external pull-up; connecting it to IN enables normal operation, while grounding it activates shutdown-simplifying control logic in the MAX6143AASA25+T implementation.