Analog Devices Inc./Maxim Integrated MAX6070BAUT33+

Overview

The MAX6070BAUT33+ from Analog Devices is a precision 3.3V series voltage reference IC with ultra-low 1/f noise (9.6µV_P-P, 0.1Hz–10Hz), 6ppm/°C max temperature drift (A grade), and ±0.04% initial accuracy - designed for high-resolution ADC/DAC biasing in industrial process control systems.

For engineers reviewing the MAX6070BAUT33+ datasheet, MAX6070BAUT33+ pinout, MAX6070BAUT33+ application, or MAX6070BAUT33+ equivalent, key selection criteria include low-noise performance at 3.3V output, 6-pin SOT23 package compatibility, filter-enabled wideband noise suppression, and AEC-Q100 qualification for automotive-grade stability.

Technical Context

The MAX6070BAUT33+ implements a bandgap-based series voltage reference architecture with dual-output force-sense topology (OUTF/GNDF and OUTS/GNDS) to reject PCB trace resistance effects. It integrates an internal filter input (FILTER pin) enabling external 0.1µF capacitor placement for high-frequency noise attenuation.

It operates over –40°C to +125°C with 4.3V to 5.5V supply range, supports ±10mA load current sourcing/sinking, and achieves 80dB ripple rejection at 60Hz - optimized for metrology-grade signal chains where long-term drift and thermal hysteresis (<85ppm) directly impact measurement fidelity.

Key Specifications

Pinout & Package

Package: 6-pin SOT23 (U6+5/U6+5A), 2.9mm × 1.6mm footprint, JEDEC MS-012 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR4533BRZ and REF5033IDR, the MAX6070BAUT33+ uniquely combines force-sense topology, integrated filter input, and AEC-Q100 qualification - making it the only option that simultaneously addresses layout-induced error, wideband EMI, and automotive reliability requirements in a single 6-pin SOT23 package.

Availability

MAX6070BAUT33+ is available at Aetrix Electronics and suitable for high-accuracy industrial process control, precision instrumentation, and high-resolution ADC/DAC applications requiring stable component supply across extended temperature ranges.

Supply support for MAX6070BAUT33+ 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The MAX6070 series belongs to Analog Devices' precision voltage reference product line, engineered specifically for metrology-grade measurement systems where sub-ppm stability, ultra-low noise, and robust layout tolerance are mandatory design requirements.

FAQ

What is the maximum load current supported by the MAX6070BAUT33+?

The MAX6070BAUT33+ supports ±10mA of load current - meaning it can both source up to +10mA to a high-impedance load and sink up to –10mA from a pull-up network. This bidirectional capability eliminates the need for external buffer amplifiers in most precision current-source and DAC reference applications, and is verified across the full –40°C to +125°C operating range per the device's Electrical Characteristics table on page 9 of the datasheet.

Does the MAX6070BAUT33+ require an external filter capacitor to achieve its specified 9.6µV_P-P noise performance?

No - the 9.6µV_P-P (0.1Hz–10Hz) noise specification for the MAX6070BAUT33+ is measured with only a 0.1µF output capacitor (COUT) and no filter capacitor on the FILTER pin. The FILTER pin is optional and used only when additional wideband (10Hz–10kHz) noise reduction is required; with CFILTER = 0.1µF, thermal noise drops to 9µV_RMS, as documented in the "Electrical Characteristics-MAX607__AUT33" table on page 9.

How does the force-sense architecture of the MAX6070BAUT33+ improve accuracy in real-world PCB layouts?

The MAX6070BAUT33+ uses separate OUTF (force) and OUTS (sense) pins with dedicated GNDF and GNDS returns to close the regulation loop at the load. This compensates for voltage drop across PCB traces - for example, a 100mΩ trace resistance carrying 10mA introduces only 1µV error instead of 1mV - preserving ±0.04% initial accuracy even with non-ideal routing. This is confirmed in the Pin Description section (page 18) and Typical Operating Characteristics (toc03).

Is the MAX6070BAUT33+ pin-compatible with other members of the MAX6070 family?

Yes - all MAX6070 variants (including MAX6070BAUT12+, MAX6070BAUT25+, and MAX6070BAUT33+) share identical 6-pin SOT23 pinout, electrical behavior, and functional interface. Only the output voltage and ordering suffix differ; the underlying silicon, pin functions (FILTER, GNDF, EN, IN, OUTS, OUTF), and thermal/ESD specifications remain consistent across the family per the "Ordering Information" section (page 20) and Pin Configurations diagram (page 18).

What is the minimum input voltage required for the MAX6070BAUT33+ to maintain regulation at full load?

The MAX6070BAUT33+ requires a minimum input voltage of 4.3V to maintain regulation at 10mA load current across the full temperature range (–40°C to +125°C), as specified in the "Electrical Characteristics-MAX607__AUT33" table (page 9). This corresponds to a worst-case dropout voltage of 150mV, defined as the VIN–VOUT differential at which output voltage deviates by 0.2% from nominal 3.300V.