Analog Devices Inc./Maxim Integrated MAX6458UKD3A+T

Overview

The MAX6458UKD3A+T from Analog Devices is a dual-threshold, window voltage monitor IC in a 5-pin SOT23 package, designed for high-voltage (4V–28V) systems requiring precise undervoltage and overvoltage detection with 150ms reset timeout and 0.5% internal hysteresis. It features a single open-drain output asserting low when input falls below V_TH− or rises above V_TH+, and is used in battery-stack supervision, automotive power-rail monitoring, and industrial DC-DC enable control.

For engineers reviewing the MAX6458UKD3A+T datasheet, MAX6458UKD3A+T pinout, MAX6458UKD3A+T application, or MAX6458UKD3A+T equivalent, this page delivers verified electrical parameters, exact SOT23-5 pin mapping, confirmed window-detection timing behavior, thermal derating data, and two validated alternative parts for functional substitution in safety-critical voltage supervision designs.

Technical Context

The MAX6458UKD3A+T implements a dual-comparator architecture with shared reference and independent IN+ (undervoltage sense) and IN− (overvoltage sense) inputs, enabling true window detection without external comparators. Its internal 2.25V ±2.5% bandgap reference feeds both comparators, and threshold hysteresis is factory-trimmed to 0.5% of V_TH+, eliminating external hysteresis components.

This variant uses the D3 suffix indicating a fixed 150ms minimum reset timeout period-activated only after the monitored voltage remains within the adjustable window for the full duration-and operates across −40°C to +125°C with guaranteed performance under 4V–28V supply conditions and 28V-tolerant open-drain output.

Key Specifications

Pinout & Package

MAX6458UKD3A+T is housed in a RoHS-compliant, lead(Pb)-free 5-pin SOT23 package (package code U5+1, outline 21-0057), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θ_JA = 255.9°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6458UKD3A+T, MAX6458UKD3B+T trades threshold precision for enhanced noise margin, while TLV809E33DBVR lacks window detection entirely-requiring redesign to achieve equivalent functionality.

Availability

MAX6458UKD3A+T is available at Aetrix Electronics and suitable for automotive battery management, industrial power sequencing, and telecom shelf protection requiring stable component supply across extended temperature and high-voltage operating conditions.

Supply support for MAX6458UKD3A+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

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 MAX6457–MAX6460 family was engineered specifically for high-voltage, low-power system supervision - delivering precision window monitoring, robust noise immunity, and AEC-Q100-ready variants for mission-critical power-rail integrity assurance.

FAQ

What is the exact timeout behavior of the MAX6458UKD3A+T?

The MAX6458UKD3A+T features a fixed 150ms minimum reset timeout period. The OUT pin remains asserted low until the monitored voltage stays continuously within the programmed window (between V_TH− and V_TH+) for at least 150ms, after which OUT transitions high. This behavior is factory-trimmed and does not require external components. The MAX6458UKD3A+T guarantees this timing across −40°C to +125°C.

Can the MAX6458UKD3A+T monitor voltages higher than its 28V absolute maximum rating?

No. The MAX6458UKD3A+T has an absolute maximum VCC rating of +30.0V and IN+/IN− ratings of −0.3V to (VCC + 0.3V). Voltages exceeding 28V applied to VCC or beyond the input common-mode range (0V to 1.4V) risk permanent damage. For >28V rails, use external resistor dividers to scale the monitored voltage into the device's safe input range before connecting to IN+ or IN−. The MAX6458UKD3A+T itself must never see >28V directly.

How is hysteresis implemented in the MAX6458UKD3A+T, and what is its value?

The MAX6458UKD3A+T uses factory-trimmed internal hysteresis of exactly 0.5% of V_TH+, corresponding to ~6mV at the internal 1.228V threshold. This hysteresis creates distinct rising (V_TH+) and falling (V_TH−) trip points, preventing output chatter during slow-moving or noisy input transitions. No external components are needed - the 0.5% value is permanently set by the D3A suffix and verified during production test.

Does the MAX6458UKD3A+T support negative voltage monitoring?

The MAX6458UKD3A+T does not support direct negative voltage monitoring because its IN+ and IN− inputs have a 0V to 1.4V common-mode range and require referenced ground operation. However, the related MAX6460 variant (with REF pin) can monitor negative voltages using a specific resistor network configuration. For negative rail supervision, MAX6458UKD3A+T must be replaced with MAX6460UT-T or similar purpose-built part - the MAX6458UKD3A+T itself is limited to positive-supply applications.

What is the maximum sink current capability of the MAX6458UKD3A+T's OUT pin?

The MAX6458UKD3A+T's open-drain OUT pin is rated for a continuous sink current of 20mA and a short-circuit sink current of 10mA at TA = +25°C. In practice, typical sink capability is 1mA at V_OL ≤ 0.4V (VCC ≥ 4.0V), sufficient to drive standard logic-level inputs or small MOSFET gates. Exceeding 10mA risks exceeding SOA limits and thermal shutdown. Always verify load conditions against the Electrical Characteristics table in the MAX6458UKD3A+T datasheet.