Analog Devices Inc./Maxim Integrated MAX6173BASA+

Overview

MAX6173BASA+ from Maxim Integrated is a high-precision, low-noise 2.5V voltage reference with integrated temperature sensor output (TEMP), ±0.1% initial accuracy, 3ppm/°C max temperature coefficient over –40°C to +125°C, and 3.8µV_P-P (0.1Hz–10Hz) noise-designed for high-resolution ADC/DAC biasing in automotive and industrial instrumentation.

For engineers reviewing the MAX6173BASA+ datasheet, MAX6173BASA+ pinout, MAX6173BASA+ application, or MAX6173BASA+ equivalent, key selection considerations include its trimmable output (±6% range), TEMP output linearity (1.9mV/°C), no-output-capacitor stability, 30mA sourcing capability, and AEC-Q100-qualified operation across –40°C to +125°C.

Technical Context

The MAX6173BASA+ uses bandgap-based architecture with proprietary curvature-correction circuitry and laser-trimmed thin-film resistors to achieve 3ppm/°C max TCV_OUT and ±0.1% initial accuracy. Its TEMP pin delivers a linear 1.9mV/°C analog voltage proportional to die temperature, calibrated at 570mV at +25°C.

It supports trimming via external resistive divider on TRIM pin (0V to V_OUT), enabling ±6% output adjustment. The device operates from (V_OUT + 2V) up to +40V input, draws 300–600µA quiescent current, and remains stable without output bypass capacitor-up to 100µF capacitive load tolerance confirms robust loop stability.

Key Specifications

Pinout & Package

MAX6173BASA+ is housed in an 8-pin SO (Small Outline) package (package code S8+4, outline 21-0041), RoHS-compliant, with exposed pad not electrically connected. Pin 1 and Pin 8 are internally connected (I.C.) and must remain unconnected externally; Pin 7 is no-connect (N.C.).

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 MAX6173BASA+ trades minor noise/accuracy margin for integrated temperature sensing and automotive qualification-making it uniquely suited for space- and cost-constrained embedded systems needing both precision reference and thermal telemetry in one SO-8 package.

Availability

MAX6173BASA+ is available at Aetrix Electronics and suitable for automotive battery monitors, industrial PLC analog inputs, medical ECG front-ends, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6173BASA+ 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 semiconductor solutions for industrial, automotive, communications, and consumer markets.

The MAX6173–MAX6177 family was engineered specifically for high-accuracy data conversion systems requiring simultaneous precision voltage referencing and on-die temperature telemetry-targeting automotive, industrial control, and portable instrumentation applications.

FAQ

What is the guaranteed initial accuracy of the MAX6173BASA+?

The MAX6173BASA+ guarantees ±0.1% initial accuracy at +25°C, corresponding to a 2.5V output range of 2.4975V to 2.5025V under no-load conditions. This specification is tested and binned during production, and applies across the full –40°C to +125°C operating temperature range as supported by its 3ppm/°C max temperature coefficient. The MAX6173BASA+ achieves this via laser trimming of thin-film resistors on Maxim's proprietary bandgap core.

Does the MAX6173BASA+ require an output bypass capacitor for stability?

No, the MAX6173BASA+ does not require an output bypass capacitor for stability. It is internally compensated and remains stable with capacitive loads up to 100µF. This eliminates board space, cost, and reliability risk associated with external capacitors-particularly valuable in sealed or long-lifecycle applications. A 0.1µF ceramic capacitor is recommended on the IN pin for optimal line-transient performance, but OUT may be left floating or directly loaded.

How is the TEMP output of the MAX6173BASA+ calibrated and what is its slope?

The TEMP output of the MAX6173BASA+ is calibrated to 570mV at +25°C with a nominal slope of 1.9mV/°C across –40°C to +125°C. This linear relationship enables direct die temperature calculation using V_TEMP = 570mV + 1.9mV/°C × (T_A − 25°C), assuming negligible self-heating. The MAX6173BASA+ datasheet specifies V_TEMP min/max as 300mV to 1130mV over temperature, confirming full-range usability for system-level thermal monitoring.

Can the output voltage of the MAX6173BASA+ be adjusted, and if so, how?

Yes, the MAX6173BASA+ output voltage can be trimmed ±6% around its nominal 2.5V using the TRIM pin. Connect a resistive divider between OUT and GND, with the wiper (or center tap) connected to TRIM. The output change follows ∆V_OUT = 2 × (V_TRIM − V_OUT/2) × k, where k = ±6% typical. For example, a 50kΩ potentiometer (e.g., MAX5436) yields full-range adjustment. Note that resistor currents add to quiescent supply current, and R2 should be ≤1MΩ to limit error.

Is the MAX6173BASA+ qualified for automotive applications?

Yes, the MAX6173BASA+ is AEC-Q100 qualified for automotive use (Grade 0: –40°C to +125°C). It meets stress testing requirements for temperature cycling, humidity, ESD, and mechanical shock per AEC-Q100 Rev H. This qualification, combined with its 3ppm/°C tempco, ±0.1% accuracy, and short-circuit protection (60mA sink to GND), makes the MAX6173BASA+ suitable for engine control units, battery management systems, and ADAS domain controllers requiring long-term reliability in harsh environments.