Analog Devices Inc./Maxim Integrated MAX6458UKD3C+T

Overview

The MAX6458UKD3C+T from Analog Devices is a dual-threshold, window voltage monitor IC designed for high-voltage industrial and automotive power-rail supervision. It features two precision comparators (one for undervoltage, one for overvoltage), a single open-drain output indicating in-window status, 8.3% internal threshold hysteresis, 150ms reset timeout delay, and operates from 4V to 28V supply with only 3.5µA typical quiescent current. It is used in multicell Li+ battery-stack protection circuits to prevent operation outside safe voltage boundaries.

For engineers reviewing the MAX6458UKD3C+T datasheet, MAX6458UKD3C+T pinout, MAX6458UKD3C+T application, or MAX6458UKD3C+T equivalent, key selection criteria include its fixed 150ms timeout for transient immunity, factory-trimmed 8.3% hysteresis eliminating external feedback, SOT23-5 package compatibility with space-constrained PCBs, and ability to supervise voltages up to 28V using only two external resistors.

Technical Context

The MAX6458UKD3C+T implements a window detection architecture where IN+ and IN− are independently compared against internal reference-derived thresholds (VTH− and VTH+), with output assertion conditional on both thresholds being simultaneously satisfied. Its internal 2.25V ±2.5% bandgap reference enables accurate trip-point setting across temperature.

It uses a fixed 150ms timeout period (not adjustable) before output state change after input crosses threshold, ensuring immunity to short-duration transients. The device lacks a CLEAR latch input-unlike the MAX6457-so it operates exclusively in transparent mode with no latched output behavior.

Key Specifications

Pinout & Package

MAX6458UKD3C+T is housed in a lead(Pb)-free, RoHS-compliant 5-pin SOT23 package (package code U5+1, outline 21-0057), with thermal resistance θJA = 255.9°C/W on multilayer board - suitable for high-density layouts with minimal heatsinking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809E33DBVR and MAX6315US31D3+T, the MAX6458UKD3C+T uniquely integrates dual-threshold window comparison, factory-set 8.3% hysteresis, and 150ms timeout in one SOT23-5 device-reducing BOM count, layout area, and validation effort for high-reliability power-rail supervision.

Availability

MAX6458UKD3C+T is available at Aetrix Electronics and suitable for automotive power management, industrial battery systems, and telecom power shelf designs requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX6458UKD3C+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, Inc. 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, ultra-low-power system supervision in harsh environments-emphasizing precision threshold stability, transient immunity, and minimal external component count.

FAQ

What is the function of the IN+ and IN− pins on the MAX6458UKD3C+T?

The IN+ pin connects to the lower node of the external resistor divider and serves as the noninverting input for the undervoltage comparator. The IN− pin connects to the upper node and serves as the inverting input for the overvoltage comparator. Together they enable true window detection: OUT goes low if VIN+ drops below VTH− OR VIN− exceeds VTH+, and goes high only when both conditions are simultaneously satisfied for ≥150ms. This dual-input architecture is intrinsic to the MAX6458UKD3C+T's window-monitoring capability.

Does the MAX6458UKD3C+T support latched output behavior like the MAX6457?

No, the MAX6458UKD3C+T does not include a CLEAR input or latched output functionality. Unlike the MAX6457, it operates exclusively in transparent mode: the OUT pin responds immediately (after the 150ms timeout) to changes in the monitored voltage relative to the programmed window boundaries. This design simplifies implementation for applications requiring continuous real-time window status indication without manual reset intervention.

How is the 8.3% hysteresis implemented in the MAX6458UKD3C+T?

The 8.3% hysteresis in the MAX6458UKD3C+T is factory-trimmed and internally integrated-no external components are required. It defines the separation between rising (VTH+) and falling (VTH−) trip thresholds as 8.3% of VTH+, resulting in VTH− = VTH+ × (1 − 0.083). This value is permanently laser-trimmed during manufacturing and appears in the part number suffix "C", ensuring consistent noise immunity across temperature and unit-to-unit without design-in effort.

Can the MAX6458UKD3C+T monitor voltages higher than its VCC supply?

No-the MAX6458UKD3C+T's IN+ and IN− inputs are limited to 0V to VCC per absolute maximum ratings. However, its open-drain OUT pin can be pulled up to voltages up to +28V regardless of VCC level, enabling interface with higher-voltage logic. To monitor voltages >VCC, use an external resistor divider to scale the input down into the 0–VCC range-this is standard practice and supported by the device's high input impedance (<55nA leakage).

What is the significance of the "3C" suffix in MAX6458UKD3C+T?

The "3" denotes the 150ms reset timeout option, and the "C" specifies the 8.3% internal threshold hysteresis-both factory-trimmed parameters encoded in the part number per Table 1 of the datasheet. This exact combination (150ms + 8.3%) is unique to the MAX6458UKD3C+T and distinguishes it from variants like MAX6458UKD0B+T (50µs + 5% hysteresis) or MAX6458UKD3A+T (150ms + 0.5% hysteresis), ensuring precise selection for noise-immune, long-delay window monitoring applications.