Analog Devices Inc./Maxim Integrated MAX6143BASA25+

Overview

MAX6143BASA25+ from Maxim Integrated is a high-precision, low-noise voltage reference with integrated temperature-sensing output (TEMP), delivering a factory-trimmed +2.5V reference with ±0.10% initial accuracy, 10ppm/°C max temperature coefficient over –40°C to +125°C, and 3.8µV_P-P (0.1Hz–10Hz) noise. It serves as the stable reference backbone in high-resolution ADC/DAC systems, precision voltage regulators, and threshold detectors requiring automotive-grade reliability.

For engineers reviewing the MAX6143BASA25+ datasheet, MAX6143BASA25+ pinout, MAX6143BASA25+ application, or MAX6143BASA25+ equivalent, key selection criteria include its 10ppm/°C tempco vs. A-grade variants, TRIM input for ±6% output adjustment, TEMP output (570mV @ 25°C, 1.9mV/°C), shutdown current of 0.01µA, and stability without output bypass capacitors up to 100µF.

Technical Context

The MAX6143BASA25+ uses bandgap-based architecture with proprietary curvature-correction circuitry and laser-trimmed thin-film resistors to achieve low drift and high initial accuracy. Its TEMP output provides a linear voltage proportional to die temperature, enabling on-chip thermal monitoring without external sensors.

It features an active-low SHDN pin that reduces quiescent current to 0.01µA, supports sourcing up to 30mA and sinking up to 2mA, and operates across a wide input range of (V_OUT + 2V) to +40V - enabling direct use with unregulated supplies in industrial and automotive environments.

Key Specifications

Pinout & Package

MAX6143BASA25+ is housed in an 8-pin SOIC (SO) package (JEDEC MS-012, 150-mil width), with pins 1 and 8 internally connected and not externally accessible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6143AASA25+, the MAX6143BASA25+ trades 7ppm/°C higher tempco for lower cost and identical packaging; versus REF5025AIDR, it offers integrated TEMP sensing and capacitor-free stability at the expense of slightly higher noise and drift - making it optimal for cost-sensitive, space-constrained automotive and industrial systems needing both reference and thermal telemetry.

Availability

MAX6143BASA25+ is available at Aetrix Electronics and suitable for high-resolution data acquisition, precision voltage regulation, and automotive ECU reference applications requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for MAX6143BASA25+ 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 industrial, automotive, communications, and computing markets.

The MAX6143 product line delivers high-accuracy, low-drift voltage references with integrated temperature sensing - engineered specifically for systems requiring both stable reference performance and on-die thermal intelligence in a single SOIC package.

FAQ

What is the guaranteed initial accuracy of the MAX6143BASA25+?

The MAX6143BASA25+ has a guaranteed initial accuracy of ±0.10% at +25°C, corresponding to an output voltage range of 2.4975V to 2.5025V. This specification is tested and guaranteed across the full automotive temperature range (–40°C to +125°C) per Maxim's production test flow, and applies specifically to the MAX6143BASA25+ variant - distinct from the tighter ±0.06% grade of the MAX6143AASA25+.

Does the MAX6143BASA25+ require an output bypass capacitor for stability?

No, the MAX6143BASA25+ does not require an external output capacitor for stability. It is designed to remain stable with capacitive loads from 0 to 100µF, eliminating the need for board space and bill-of-materials overhead associated with output bypassing. This feature is confirmed in the device's Electrical Characteristics table and Typical Operating Characteristics plots (e.g., Figure MAX6143toc13).

What is the function and electrical behavior of the TEMP pin on the MAX6143BASA25+?

The TEMP pin on the MAX6143BASA25+ outputs a voltage linearly proportional to die temperature: 570mV at +25°C with a coefficient of 1.9mV/°C. It is intended for thermal monitoring and compensation, not for driving loads - the datasheet specifies it must be unloaded for accurate measurement. Self-heating effects are accounted for in the calibration, and the output remains valid across the full –40°C to +125°C junction temperature range.

Can the MAX6143BASA25+ be used with input voltages below 4.5V?

No - the MAX6143BASA25+ requires a minimum input voltage of (V_OUT + 2V), which for the +2.5V version is 4.5V. Operation below this level is outside absolute maximum ratings and will result in improper regulation or dropout. The device is not specified for operation at 3.3V or other sub-4.5V supplies, and attempting to do so may cause output instability or excessive drift.

How does the TRIM pin on the MAX6143BASA25+ enable output voltage adjustment?

The TRIM pin on the MAX6143BASA25+ allows ±6% adjustment of the nominal +2.5V output by connecting a resistive divider between OUT and GND, with the wiper tied to TRIM. The change in output voltage follows ∆V_OUT = 2 × (V_TRIM − V_TRIM(open)) × k, where k ≈ ±6%. This enables post-assembly calibration to compensate for system-level tolerances without redesigning the reference network - a capability unique to the MAX6143 family among automotive-grade references.