Analog Devices Inc./Maxim Integrated MAX6806US46-T

Overview

MAX6806US46-T from Maxim Integrated is a precision voltage detector IC designed for reliable power-supply monitoring in microprocessor-based systems. It features a factory-preset 4.6V ±2% reset threshold, active-low push-pull RESET output, and manual-reset (MR) input - all in a 4-pin SOT143 package. Valid down to VCC = 1.0V, it ensures robust brownout detection in battery-powered instrumentation and portable controllers.

For engineers reviewing the MAX6806US46-T datasheet, MAX6806US46-T pinout, MAX6806US46-T application, or MAX6806US46-T equivalent, key selection criteria include its 4.6V threshold accuracy, MR-enabled reset control, 35µA supply current, and guaranteed operation across –40°C to +85°C - critical for embedded power-monitoring designs requiring deterministic reset behavior under transient conditions.

Technical Context

The MAX6806US46-T implements a precision bandgap-based voltage comparator with internal hysteresis (VHYST = 0.02–0.03 × VTH−), ensuring stable reset assertion/deassertion without oscillation near threshold. Its push-pull output drives CMOS logic directly without external pull-up components.

It integrates an internal 80kΩ pulldown resistor on the MR pin, enabling simple momentary-switch interfacing while supporting noise immunity via optional 0.1µF MR-to-GND decoupling. The device asserts RESET low when VCC falls below 4.508V (min) or rises above 4.692V (max) at +25°C, with tempco ≤30ppm/°C.

Key Specifications

Pinout & Package

MAX6806US46-T is housed in a 4-pin SOT143 package (JEDEC TO-236AB), with exposed pad not electrically connected. Pin 1 is RESET (active-low push-pull), Pin 2 is GND, Pin 3 is VCC, and Pin 4 is MR (active-high manual reset).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6806US46-T, MAX6326US46D3-T trades MR functionality for ultra-low IQ and open-drain flexibility, while TLV803EC46DBZR offers superior threshold accuracy and sub-µA consumption but omits MR and uses a smaller 3-pin footprint - making MAX6806US46-T the only option among the three with integrated manual reset in SOT143.

Availability

MAX6806US46-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, intelligent instrumentation, industrial controllers, and critical µP power monitoring requiring stable component supply and long-term lifecycle support.

Supply support for MAX6806US46-T 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) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power-management ICs for industrial, computing, and communications markets.

The MAX6806 series belongs to Maxim's supervisory IC product line, engineered specifically for accurate, low-power voltage monitoring in microprocessor and microcontroller systems where deterministic reset behavior and manual intervention capability are essential.

FAQ

What is the reset threshold voltage of the MAX6806US46-T?

The MAX6806US46-T has a factory-trimmed nominal reset threshold of 4.6V, specified with ±2% accuracy over temperature (4.508V to 4.692V at +25°C). This threshold applies to VCC falling conditions and is guaranteed across the full –40°C to +85°C operating range with a tempco of ≤30ppm/°C. The MAX6806US46-T uses this precise threshold to assert RESET before downstream ICs operate outside their specified voltage windows.

Does the MAX6806US46-T support manual reset functionality?

Yes, the MAX6806US46-T includes a dedicated MR (manual reset) input on Pin 4 of its SOT143 package. The MR pin is active-high and features an internal 80kΩ pulldown resistor, allowing direct connection of a normally-open momentary switch between MR and VCC. When MR is pulled above 0.7×VCC, the device immediately asserts RESET low - a feature unique to the SOT143 variants of the MAX6806 family and not present in SC70 or SOT23 versions.

What is the operating voltage range for the MAX6806US46-T?

The MAX6806US46-T operates over a VCC range of 1.0V to 5.5V across the full industrial temperature range (–40°C to +85°C). Its RESET output remains valid down to VCC = 1.0V, ensuring reliable brownout detection even during deep supply sag. Absolute maximum VCC is +6.0V, and the device tolerates transient excursions up to 100V/µs on the VCC line without false triggering.

How does the MAX6806US46-T differ from the MAX6807US46-T and MAX6808US46-T?

The MAX6806US46-T features an active-low push-pull RESET output, whereas the MAX6807US46-T provides active-high push-pull, and the MAX6808US46-T delivers active-low open-drain. All three share identical 4.6V threshold, MR input (SOT143), and electrical specs - but differ in output topology to match host µP reset pin requirements. For example, MAX6806US46-T directly drives standard active-low reset inputs, while MAX6808US46-T is preferred for bidirectional or multi-drop reset buses.

What package type is used for the MAX6806US46-T?

The MAX6806US46-T is supplied in a 4-pin SOT143 (TO-236AB) surface-mount package with gull-wing leads. This variant uniquely includes the MR pin - unlike the 3-pin SC70 and SOT23 versions of the same family. The SOT143 footprint is compatible with standard reflow processes, and the device is shipped in tape-and-reel format with a minimum order quantity of 2500 units.