Analog Devices Inc./Maxim Integrated MAX6806UR46+T

Overview

MAX6806UR46+T from Maxim Integrated is a precision voltage detector IC designed for power-supply monitoring in microprocessor-based systems. It features a factory-preset 4.6V ±2% reset threshold, active-low push-pull RESET output, 35µA supply current, and guaranteed operation down to VCC = 1.0V - used in critical µP power monitoring for portable equipment and intelligent instruments.

For engineers reviewing the MAX6806UR46+T datasheet, MAX6806UR46+T pinout, MAX6806UR46+T application, or MAX6806UR46+T equivalent, key selection criteria include reset threshold accuracy, low-voltage validity of RESET, SOT23-3 package footprint, immunity to VCC transients, and compatibility with 5V/3.3V digital logic interfaces.

Technical Context

The MAX6806UR46+T implements a precision bandgap-based voltage comparator with internal hysteresis (VHYST = 0.02–0.03 × VTH−) to prevent output chatter during supply brownouts. Its reset assertion is purely analog - no internal timer or delay circuitry - enabling immediate response to VCC falling below 4.508V (min) or rising above 4.692V (max) at +25°C.

It operates across −40°C to +85°C with supply current stable from 1.0V to 5.5V VCC, and its push-pull output drives CMOS loads directly without external pull-up resistors. The SOT23-3 package excludes manual reset (MR), distinguishing it from the 4-pin SOT143 variant.

Key Specifications

Pinout & Package

MAX6806UR46+T is housed in a 3-pin SOT23 package (U3-1 outline), with 1.3mm × 0.8mm footprint and 0.95mm pitch. This RoHS-compliant, tape-and-reel packaged device supports automated placement in space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB46DBZR and TPS3808G33DBVR, the MAX6806UR46+T uniquely combines 4.6V precision, push-pull simplicity, and 1.0V operational floor - making it optimal for cost-sensitive, space-constrained 5V µP systems needing deterministic, zero-delay reset behavior.

Availability

MAX6806UR46+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, bar-code scanners, and critical µP power monitoring requiring stable component supply and long-term industrial availability.

Supply support for MAX6806UR46+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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, computing, and communications applications.

The MAX6806 series belongs to Maxim's precision voltage supervisor product line, engineered specifically for reliable, low-component-count power monitoring in µP-based systems where accuracy, low voltage operation, and transient immunity are essential.

FAQ

What is the exact reset threshold voltage of the MAX6806UR46+T?

The MAX6806UR46+T has a factory-trimmed nominal reset threshold of 4.6V with ±2% accuracy over temperature, meaning the actual threshold falls between 4.508V and 4.692V at +25°C. This tolerance is guaranteed across the full −40°C to +85°C operating range, ensuring consistent power-fail detection in diverse environmental conditions. The MAX6806UR46+T uses internal bandgap referencing to maintain this precision without external calibration.

Does the MAX6806UR46+T require any external components to function?

No, the MAX6806UR46+T operates autonomously with only three connections: VCC, GND, and the active-low RESET output. It contains all necessary precision references, comparators, and push-pull output drivers internally. Unlike RC-based reset circuits, the MAX6806UR46+T eliminates trimming resistors, capacitors, and associated layout sensitivity - reducing BOM cost and improving long-term reliability in production systems.

Can the MAX6806UR46+T operate reliably when the supply voltage drops below 2.0V?

Yes, the MAX6806UR46+T guarantees valid RESET output down to VCC = 1.0V, with the RESET pin remaining a solid logic low throughout that range. This capability is confirmed in the datasheet's Electrical Characteristics table under "RESET Output Voltage (MAX6806/MAX6808)" and enables robust shutdown sequencing in deeply depleted battery scenarios. The MAX6806UR46+T continues to monitor and assert reset even as VCC approaches 1.0V - a key differentiator from many competing supervisors.

What package type is used for the MAX6806UR46+T, and is it RoHS compliant?

The MAX6806UR46+T is supplied in a 3-pin SOT23 package (package code U3-1, outline 21-0051), measuring 1.3mm × 0.8mm with 0.95mm lead pitch. It is RoHS compliant, as indicated by the "+" suffix in its ordering code per Maxim's packaging conventions. This compact, surface-mount package supports high-density PCB layouts and is optimized for automated assembly in portable and handheld electronics manufacturing.

How does the MAX6806UR46+T handle power-supply transients?

The MAX6806UR46+T is specifically designed to reject short-duration negative-going VCC transients - it will not assert reset for dips up to 100mV below the threshold if duration is under ~100ns, as shown in Figure 3 of the datasheet. This immunity is achieved through internal filtering and comparator design, making the MAX6806UR46+T suitable for use with noisy switch-mode power supplies or in electrically harsh environments like bar-code scanners and industrial handhelds.