Analog Devices Inc./Maxim Integrated MAX6194BESA+

Overview

MAX6194BESA+ from Maxim Integrated is a precision, micropower, low-dropout series-mode bandgap voltage reference delivering a stable 4.500V output with ±2mV initial accuracy, 5ppm/°C max temperature coefficient, and only 35µA max quiescent supply current. It operates from (VOUT + 0.2V) to 12.6V input, supports ±500µA load current, and is used in high-accuracy ADC/DAC biasing, portable instrumentation, and industrial process control systems requiring long-term stability and low power.

For engineers reviewing the MAX6194BESA+ datasheet, MAX6194BESA+ pinout, MAX6194BESA+ application, or MAX6194BESA+ equivalent, this page provides verified technical context, real-world design meaning for key specs, validated SO-8 package and pin functions, application-specific implementation value, and two confirmed alternative parts with documented functional and parametric differences.

Technical Context

The MAX6194BESA+ employs a proprietary curvature-correction circuit and laser-trimmed thin-film resistors to achieve <5ppm/°C temperature coefficient and ±2mV initial accuracy across –40°C to +85°C. Its series-mode architecture enables bidirectional load capability (±500µA) and dropout as low as 100mV at 500µA sink/source.

Internally compensated for stability with capacitive loads up to 2.2nF, it delivers fast turn-on settling (180µs to 0.1%) and exhibits 0.16µV/µA load regulation and 25µV/V line regulation - critical for precision data acquisition in battery-powered and low-noise systems.

Key Specifications

Pinout & Package

MAX6194BESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and rated for –40°C to +85°C operation. Pin 1 is OUT; pins 1,3,5,7,8 are No Connect (N.C.); pin 4 is GND; pin 2 is IN; pin 6 is OUT - matching the standard SO-8 footprint with exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5045IDR and ADR4545BRZ, the MAX6194BESA+ uniquely balances ±2mV accuracy, ≤5ppm/°C TC, and ≤35µA supply current in SO-8 - making it the only viable option for portable, battery-critical 4.5V reference applications where all three parameters are simultaneously constrained.

Availability

MAX6194BESA+ is available at Aetrix Electronics and suitable for hand-held instruments, precision ADC/DAC systems, and industrial process control requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.

Supply support for MAX6194BESA+ 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, medical, and communications applications.

The MAX6190–MAX6195/MAX6198 family was engineered specifically for micropower, high-accuracy voltage referencing in portable and battery-operated systems where low dropout, ultra-low current, and ppm-level stability are non-negotiable.

FAQ

What is the maximum load current the MAX6194BESA+ can source or sink?

The MAX6194BESA+ is specified to source and sink up to ±500µA while maintaining output accuracy within datasheet limits. At 500µA load, dropout remains ≤100mV, and load regulation is characterized at 0.16µV/µA - ensuring total output deviation stays below 80µV across the full bidirectional range. This capability supports both active biasing and current-loop interfacing without external buffers.

Does the MAX6194BESA+ require an output capacitor for stability?

No, the MAX6194BESA+ is internally compensated and stable with output capacitance ranging from 0 to 2.2nF. An external capacitor is optional and recommended only in applications subject to fast load or supply transients - such as SAR ADC sampling - where it reduces overshoot and improves transient response. Board space-constrained designs may omit it entirely without risk of oscillation.

What is the minimum input voltage required for proper operation of the MAX6194BESA+?

The minimum input voltage for the MAX6194BESA+ is VOUT + 0.2V = 4.7V under normal conditions. However, during turn-on before regulation is established, the device may draw up to 200µA - requiring the supply to support this transient current. For reliable startup, ensure the input source can deliver ≥200µA at ≥4.7V; sustained operation below 4.7V risks loss of regulation and increased output drift.

How does the MAX6194BESA+ compare to the MAX6194AESA+ and MAX6194CESA+ variants?

The MAX6194BESA+ offers ±2mV initial accuracy and ≤5ppm/°C temperature coefficient, positioning it between the tighter-tolerance MAX6194AESA+ (±2mV / ≤4ppm/°C) and looser MAX6194CESA+ (±10mV / ≤25ppm/°C). All share identical SO-8 packaging, 4.500V nominal output, and electrical behavior - differing only in factory-trimmed accuracy and TC bins. The B-grade provides optimal cost/performance balance for industrial-grade instrumentation.

Is the MAX6194BESA+ suitable for use in automotive applications?

The MAX6194BESA+ is rated for –40°C to +85°C operation and is RoHS-compliant, but it is not AEC-Q200 qualified. For automotive applications requiring qualification, Maxim offers the automotive-grade variant MAX6194BESA/V+, which shares identical electrical specs but undergoes extended reliability testing per AEC-Q200. Use MAX6194BESA+ only in non-safety-critical, non-qualified automotive subsystems where ambient temperature remains within its specified range.