Analog Devices Inc./Maxim Integrated MAX6457UKD0B

Overview

MAX6457UKD0B from Maxim Integrated is a single-channel, high-voltage undervoltage/overvoltage monitor IC with latched output, 5% internal threshold hysteresis, 50μs timeout period, and open-drain n-channel output compliant to 28V. It operates from 4V to 28V supply, draws only 3.5μA typical at 12V, and functions across –40°C to +125°C for battery-stack undervoltage lockout in industrial power systems.

For engineers reviewing the MAX6457UKD0B datasheet, MAX6457UKD0B pinout, MAX6457UKD0B application, or MAX6457UKD0B equivalent, this page delivers verified electrical parameters, SOT23-5 package layout, latch control behavior, hysteresis-dependent trip thresholds (1.133V–1.194V), and direct alternatives for voltage monitoring in automotive and telecom power rails.

Technical Context

The MAX6457UKD0B implements a precision bandgap reference (2.25V ±2.5%) driving a low-offset comparator with factory-trimmed 5% hysteresis (VTH+ = 1.194V, VTH− = 1.133V at −40°C to +85°C), enabling noise-immune detection without external feedback. Its CLEAR input supports latched overvoltage reporting: high on CLEAR holds OUT high after VIN+ exceeds VTH+, while low makes the output transparent.

It features undervoltage lockout down to VCC = 1.5V (OUT remains asserted), open-drain output capable of sinking 10mA with VOL ≤ 0.4V at 1mA, and immunity to transients <100µs when overdriven by ≤300mV - all within a 5-pin SOT23 package rated for extended temperature operation.

Key Specifications

Pinout & Package

MAX6457UKD0B is housed in a lead-free, RoHS-compliant 5-pin SOT23 package (package code U5+1, outline 21-0057) with 1.27mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted. Pin 1 is marked with a dot; device orientation follows standard SOT23 top-view convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809E33DBZR and MAX6315US31D3+, the MAX6457UKD0B provides field-adjustable trip thresholds via resistor dividers, programmable latch behavior via CLEAR, and 4V–28V operation - making it uniquely suited for multicell battery and wide-input industrial monitoring where flexibility and high-voltage tolerance are mandatory.

Availability

MAX6457UKD0B is available at Aetrix Electronics and suitable for industrial power management, automotive infotainment, and telecom line card applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.

Supply support for MAX6457UKD0B 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 and mixed-signal ICs for power, sensing, and interface applications, with emphasis on high-reliability, low-power solutions for harsh environments.

The MAX6457UKD0B belongs to the MAX6457–MAX6460 family of high-voltage, low-current voltage monitors engineered specifically for undervoltage/overvoltage protection in battery-powered and industrial systems operating from 4V to 28V.

FAQ

What is the exact trip voltage range of MAX6457UKD0B at room temperature?

The MAX6457UKD0B has factory-trimmed 5% hysteresis, yielding VTH+ = 1.194V and VTH− = 1.133V at −40°C to +85°C. At +25°C, these values fall within the typical 1.133V–1.194V span, enabling precise undervoltage lockout or overvoltage detection when used with an external resistor divider. The actual trip point is set by R1/R2 ratio referenced to the internal 2.25V bandgap.

How does the CLEAR pin function in MAX6457UKD0B, and what happens if left unconnected?

In MAX6457UKD0B, the CLEAR pin controls latch behavior: driven high, it latches OUT high after an overvoltage event; driven low, it enables transparent operation. If left unconnected, CLEAR floats high due to internal bias, causing unpredictable latching. Per datasheet guidance, CLEAR must be tied to GND when unused to ensure reliable transparent-mode operation and proper power-up behavior.

Can MAX6457UKD0B monitor voltages higher than its 28V absolute maximum rating?

No. The MAX6457UKD0B's absolute maximum rating for VCC and OUT is +30.0V, and IN+/IN− inputs tolerate only up to VCC + 0.3V. To monitor voltages above 28V (e.g., 48V telecom rails), use a precision resistor divider to scale the input into the 0–VCC range before applying it to IN+. The device itself must never see >28V on any pin.

Is MAX6457UKD0B qualified for automotive applications per AEC-Q100?

No. While the MAX6457UKD0B is specified from −40°C to +125°C and offered in lead(Pb)-free packaging, it is not AEC-Q100 qualified. Only specific variants like MAX6459UTA/V-T carry AEC-Q100 qualification. For automotive use requiring formal qualification, select an AEC-Q100–rated alternative such as MAX6315US31D3+.

What is the minimum pullup resistor value required for the open-drain OUT pin of MAX6457UKD0B?

The MAX6457UKD0B OUT pin sinks up to 10mA with VOL ≤ 0.4V at 1mA. For a 3.3V pullup, the minimum resistor is R = (3.3V − 0.4V) / 10mA = 290Ω. However, typical designs use 10kΩ–100kΩ to minimize current draw. The choice depends on rise time requirements and bus capacitance - lower resistance yields faster edges but higher quiescent current.