Analog Devices Inc./Maxim Integrated MAX6457UKD3C

Overview

MAX6457UKD3C from Maxim Integrated is a single-channel, high-voltage (4V–28V), low-power undervoltage/overvoltage monitor with latched open-drain output, 8.3% internal threshold hysteresis, and 150ms reset timeout delay. 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. Used in multicell Li+ battery-stack power management for undervoltage lockout in industrial and automotive systems.

For engineers reviewing the MAX6457UKD3C datasheet, MAX6457UKD3C pinout, MAX6457UKD3C application, or MAX6457UKD3C equivalent, this device supports precise voltage supervision in noise-sensitive high-temperature environments where stable trip thresholds, latch control via CLEAR input, and 28V-tolerant open-drain output are critical for system reliability.

Technical Context

The MAX6457UKD3C implements a single comparator with adjustable trip point set by external resistors on IN+, referenced to an internal 2.25V bandgap. Its latched-output architecture uses the CLEAR pin to hold OUT high after overvoltage detection until manually reset.

It delivers 150ms minimum timeout delay and 8.3% hysteresis (VTH+ = 1.255V, VTH− = 1.151V at TA = −40°C to +85°C), ensuring immunity to transients and preventing chatter near threshold. The device asserts OUT low during VCC < 4V or when VIN+ falls below VTH−, and transitions high only after VIN+ exceeds VTH+ for ≥150ms.

Key Specifications

Pinout & Package

MAX6457UKD3C is housed in a 5-pin SOT23-5 package (U5-1), with 1.6mm × 2.9mm footprint and 1.1mm max height, suitable for space-constrained PCBs in automotive and portable industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809EC26DBVR and MAX6326UR26D3-T, MAX6457UKD3C uniquely combines 28V operation, factory-trimmed 8.3% hysteresis, and CLEAR-controlled latching-enabling robust fault handling in high-voltage, noise-prone environments where trip point adjustability and persistent fault signaling are mandatory.

Availability

MAX6457UKD3C is available at Aetrix Electronics and suitable for automotive battery management, industrial DC-DC converter supervision, and telecom power shelf monitoring requiring stable component supply across extended temperature and high-voltage operating conditions.

Supply support for MAX6457UKD3C 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 demanding industrial, automotive, and communications applications.

MAX6457UKD3C belongs to the MAX6457–MAX6460 family of high-voltage, low-current voltage monitors engineered for reliable power-rail supervision in harsh environments where wide input range, low IQ, and configurable hysteresis are essential.

FAQ

What is the exact timeout period specification for MAX6457UKD3C?

The MAX6457UKD3C has a guaranteed minimum reset timeout period of 90ms, typical value of 150ms, and maximum of 210ms. This delay begins when the monitored input (IN+) rises above the upper threshold (VTH+) and ends when the output (OUT) transitions high. The timing is internally generated and does not require external capacitors.

How does the CLEAR pin function in MAX6457UKD3C?

In MAX6457UKD3C, the CLEAR pin controls latched output behavior: driving CLEAR high latches OUT high after an overvoltage event, holding the state until CLEAR is toggled low. At power-up, CLEAR must be low to avoid unintended latching; it is recommended to tie CLEAR to GND when unused to ensure transparent operation.

Can MAX6457UKD3C monitor voltages higher than its VCC supply?

No - the IN+ input of MAX6457UKD3C must remain within 0V to VCC per absolute maximum ratings. However, the open-drain OUT can be pulled up to voltages up to 28V regardless of VCC, enabling interface with higher-voltage logic or control circuits while monitoring only rails ≤ VCC.

What is the significance of the '3C' suffix in MAX6457UKD3C?

The '3C' suffix in MAX6457UKD3C denotes the factory-configured options: '3' specifies the 150ms timeout period (vs. '0' for 50µs), and 'C' specifies 8.3% internal threshold hysteresis (vs. 'A' = 0.5%, 'B' = 5%). These are laser-trimmed during manufacturing and cannot be altered externally.

Does MAX6457UKD3C include an internal voltage reference?

Yes, MAX6457UKD3C integrates a precision 2.25V ±2.5% bandgap reference used internally for comparator threshold generation. While the reference is not exposed as a pin (unlike MAX6460), it enables accurate, temperature-stable trip points when used with external resistor dividers on IN+.