Analog Devices Inc./Maxim Integrated MAX6457UKD0A+T

Overview

The MAX6457UKD0A+T from Analog Devices is a single-channel, high-voltage (4V–28V), low-power undervoltage/overvoltage monitor IC with 0.5% internal threshold hysteresis, 50μs timeout, and latched open-drain output. It features a precision 2.25V ±2.5% internal reference, 3.5μA typical supply current at 12V, and operates across –40°C to +125°C. It is used in multicell Li+ battery-stack shutdown circuits to disable DC-DC converters upon voltage deviation.

For engineers reviewing the MAX6457UKD0A+T datasheet, MAX6457UKD0A+T pinout, MAX6457UKD0A+T application, or MAX6457UKD0A+T equivalent, key selection criteria include its SOT23-5 package, factory-trimmed 0.5% hysteresis, 50μs response time, latch control via CLEAR input, and compatibility with high-voltage monitoring up to 28V while consuming sub-5μA quiescent current.

Technical Context

The MAX6457UKD0A+T implements a single precision comparator with internal bandgap reference and fixed 0.5% hysteresis, enabling noise-immune trip-point detection without external components. Its CLEAR input provides digital latch control for overvoltage events, supporting both transparent and latched modes depending on logic level at power-up.

It uses an internal 2.25V reference to set adjustable thresholds via external resistor dividers on IN+, supports undervoltage lockout down to VCC = 1.5V, and delivers a 28V-compliant open-drain output capable of sinking 250μA with VOL ≤ 0.4V - all within a 5-pin SOT23 footprint rated for automotive-grade temperature range.

Key Specifications

Pinout & Package

MAX6457UKD0A+T is housed in a RoHS-compliant, lead(Pb)-free 5-pin SOT23 package (package code U5+1, outline 21-0057), with thermal resistance θJA = 324.3°C/W (single-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809EADBZR and MAX6315US29D3+T, the MAX6457UKD0A+T uniquely combines programmable threshold via resistor dividers, factory-trimmed 0.5% hysteresis, 50μs speed, and CLEAR-controlled latching - making it the only option among the three for adaptive, high-voltage, fault-retentive monitoring in battery-powered industrial systems.

Availability

MAX6457UKD0A+T is available at Aetrix Electronics and suitable for automotive battery management, industrial power sequencing, and portable medical equipment requiring stable component supply across extended temperature and high-voltage operating conditions.

Supply support for MAX6457UKD0A+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 MAX6457UKD0A+T belongs to the MAX6457–MAX6460 family of high-voltage, low-quiescent-current voltage monitors designed specifically for robust, programmable power supervision in harsh-environment battery and industrial power systems.

FAQ

What is the function of the CLEAR pin on the MAX6457UKD0A+T?

The CLEAR pin on the MAX6457UKD0A+T controls latched output behavior: driving it high latches the OUT pin high after an overvoltage event, while pulling it low enables transparent operation where OUT follows input transitions. It must be held low during power-up to ensure predictable initialization, and connecting it to GND disables latching entirely. This functionality is integral to the MAX6457UKD0A+T's role in fault-retentive monitoring systems.

Does the MAX6457UKD0A+T require external components to set its trip voltage?

Yes, the MAX6457UKD0A+T requires two external resistors to form a voltage divider from the monitored rail to IN+, enabling precise adjustment of the undervoltage/overvoltage trip point using the internal 2.25V reference. The device's high input impedance (>1GΩ) allows use of MΩ-range resistors without loading error, and no external hysteresis components are needed due to its factory-trimmed 0.5% hysteresis. This configuration is standard for all MAX6457UKD0A+T implementations.

What is the maximum voltage the MAX6457UKD0A+T output can tolerate?

The MAX6457UKD0A+T open-drain output is rated for 28V compliance, meaning the pull-up voltage on the OUT pin may be as high as +28V regardless of VCC level - enabling direct interface to higher-voltage logic or protection circuits. This specification is explicitly guaranteed in the Absolute Maximum Ratings table and applies across the full –40°C to +125°C operating range. The MAX6457UKD0A+T maintains this rating without derating.

Can the MAX6457UKD0A+T monitor voltages lower than its VCC supply?

No - the MAX6457UKD0A+T requires VCC ≥ 4V for normal comparator operation, and the IN+ input must remain within 0V to VCC per Absolute Maximum Ratings. However, the device retains correct undervoltage lockout behavior (OUT asserted low) even as VCC drops to 1.5V, ensuring fail-safe output state during brownout. For monitoring voltages outside VCC range, external level-shifting or the MAX6460 variant with REF and dual inputs is required - not the MAX6457UKD0A+T.

Is the MAX6457UKD0A+T qualified for automotive applications?

The MAX6457UKD0A+T is specified over –40°C to +125°C and packaged in a RoHS-compliant SOT23, but it is not AEC-Q100 qualified - unlike the MAX6459UTA/V+ variant. Its datasheet does not list automotive qualification, and the part number suffix lacks "/V", which denotes AEC-Q100 compliance in the MAX6457–MAX6460 family. Therefore, while suitable for industrial and extended-temperature applications, the MAX6457UKD0A+T should not be selected for ASIL-B or higher automotive safety-critical functions without additional system-level validation.