Analog Devices Inc./Maxim Integrated MAX6143BASA33

Overview

MAX6143BASA33 from Maxim Integrated is a high-precision, low-noise voltage reference with integrated temperature-sensing output (TEMP), delivering a stable +3.3V reference with ±0.10% initial accuracy, 10ppm/°C max temperature coefficient over -40°C to +125°C, and 5µV_P-P (0.1–10Hz) noise. It sources up to 30mA, operates from (V_OUT + 2V) to +40V input, and supports trimming via resistive divider on TRIM pin - ideal for high-resolution ADC/DAC biasing in automotive sensor modules.

For engineers reviewing the MAX6143BASA33 datasheet, MAX6143BASA33 pinout, MAX6143BASA33 application, or MAX6143BASA33 equivalent, key selection criteria include its guaranteed 10ppm/°C tempco over full automotive range, TEMP output linearity (2.1mV/°C), shutdown current <5µA, no-output-capacitor stability, and SO-8 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX6143BASA33 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 (630mV at +25°C, 2.1mV/°C), enabling direct thermal monitoring without external sensors.

It features active-low SHDN control (VIH = 2.0V, VIL = 0.8V), TRIM input for ±6% output adjustment via external resistor network, and robust operation across 5.3V–40V supply range. Load regulation remains ≤900ppm/mA while sourcing up to 30mA or sinking 2mA - critical for driving ADC reference inputs and analog front-end buffers.

Key Specifications

Pinout & Package

MAX6143BASA33 is housed in an 8-pin SOIC (SO-8) package, 3.9mm × 4.9mm body, 1.27mm pitch, with pins 1 and 8 internally connected (do not route externally).

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3333AIDBVR and ADR4533BRZ, MAX6143BASA33 uniquely combines automotive-grade tempco, integrated die temperature sensing, and trim capability - making it the only option that eliminates both external temperature sensing and system-level reference calibration in embedded sensor nodes.

Availability

MAX6143BASA33 is available at Aetrix Electronics and suitable for automotive sensor modules, high-resolution data acquisition systems, digital voltmeters, and battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6143BASA33 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, automotive, and communications applications.

The MAX6143 product line delivers high-accuracy voltage references with integrated temperature sensing for applications requiring simultaneous precision biasing and thermal monitoring - targeting automotive sensor fusion, portable instrumentation, and industrial control systems.

FAQ

What is the guaranteed temperature coefficient of MAX6143BASA33 over its full operating range?

The MAX6143BASA33 has a maximum temperature coefficient of 10ppm/°C over the full -40°C to +125°C operating range, as specified in the Electrical Characteristics table for MAX6143_33 devices. This value applies specifically to the MAX6143BASA33 variant and is measured across the entire temperature span, not just at +25°C. The 10ppm/°C rating ensures predictable, bounded drift in automotive and industrial environments where thermal cycling is routine. MAX6143BASA33 maintains this spec without requiring external compensation.

Does MAX6143BASA33 require an output bypass capacitor for stability?

No, MAX6143BASA33 does not require an output bypass capacitor for stability. The device is explicitly designed to be stable with capacitive loads ranging from 0 to 100µF, eliminating the need for a mandatory output capacitor. This feature reduces bill-of-materials cost and PCB area in space-constrained applications such as automotive ECUs and portable instrumentation. Local 0.1µF input decoupling at the IN pin is still recommended for optimal line-transient performance. MAX6143BASA33's internal compensation ensures phase margin remains adequate across all load conditions.

How is the TEMP output of MAX6143BASA33 calibrated and what is its accuracy?

The TEMP output of MAX6143BASA33 is factory-calibrated to provide 630mV at +25°C with a nominal slope of 2.1mV/°C. While the datasheet does not specify absolute accuracy of the TEMP output, its linearity and repeatability are ensured by the same curvature-corrected bandgap core used for the main reference. The TEMP voltage tracks die temperature directly and is intended for relative thermal monitoring or system-level compensation - not absolute temperature measurement. For best results, avoid loading the TEMP pin, as output impedance is high. MAX6143BASA33's TEMP function enables closed-loop thermal compensation without external sensors.

Can MAX6143BASA33 be used with a 3.3V supply rail?

No, MAX6143BASA33 cannot operate from a 3.3V supply rail. Its minimum input voltage is (V_OUT + 2V), which for the +3.3V variant equals 5.3V. The device requires a supply between 5.3V and 40V to maintain regulation and specified performance. Attempting to power MAX6143BASA33 from 3.3V will result in dropout and loss of reference accuracy. A pre-regulator or higher-voltage supply (e.g., 12V automotive rail) is required. This headroom requirement ensures sufficient PSRR and load regulation - a deliberate design trade-off for high-precision operation. MAX6143BASA33 is not a low-dropout reference.

What is the maximum load current that MAX6143BASA33 can source while maintaining specification?

MAX6143BASA33 can source up to 30mA while maintaining its specified output voltage accuracy and load regulation (≤900ppm/mA). This capability is verified across the full -40°C to +125°C temperature range and allows direct driving of ADC reference inputs, op-amp buffers, and small analog subsystems without external gain stages. At 30mA, the device exhibits minimal dropout - typically <1.5V above V_OUT at +25°C. Sinking capability is limited to 2mA. Exceeding 30mA may cause output deviation beyond the 0.10% initial accuracy band and increased thermal drift. MAX6143BASA33's 30mA drive strength simplifies system design by reducing need for buffer amplifiers.