Analog Devices Inc./Maxim Integrated MAX6457UKD0C

Overview

MAX6457UKD0C from Maxim Integrated is a single-channel, high-voltage (4V–28V), low-power undervoltage/overvoltage monitor with 8.3% internal threshold hysteresis, 50µs timeout period, and open-drain n-channel output compliant to 28V. 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 equipment for undervoltage lockout and overvoltage shutdown.

For engineers reviewing the MAX6457UKD0C datasheet, MAX6457UKD0C pinout, MAX6457UKD0C application, or MAX6457UKD0C equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, hysteresis impact on noise immunity, and validated alternative options for voltage monitoring in automotive, industrial, and telecom power systems.

Technical Context

The MAX6457UKD0C implements a single precision comparator with factory-trimmed 8.3% hysteresis (VTH+ = 1.093V, VTH− = 1.071V at −40°C to +85°C), enabling robust noise rejection without external feedback. Its logic-controlled CLEAR input supports latched or transparent operation-driving CLEAR high latches OUT high after overvoltage detection, while grounding CLEAR enables continuous monitoring.

It uses an internal 2.25V bandgap reference to set trip thresholds via external resistor dividers on IN+, supports undervoltage lockout down to VCC = 1.5V (with OUT asserted low), and delivers 250µA sink capability at VOL ≤ 0.4V. The device asserts OUT low when VIN+ drops below VTH− or rises above VTH+, with state change delayed by a fixed 50µs timeout after threshold crossing.

Key Specifications

Pinout & Package

MAX6457UKD0C is housed in a 5-pin SOT23 package (package code U5+1), with 1.6mm × 2.9mm footprint and 0.95mm height. Pin 1 is OUT, Pin 2 is GND, Pin 3 is IN+, Pin 4 is CLEAR, and Pin 5 is VCC. All pins are surface-mount compatible and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6457UKD0B-T, MAX6457UKD0C offers wider hysteresis for harsher EMI environments but slightly lower absolute trip voltage; compared with TLV809EADBZR, it supports 4V–28V operation, adjustable thresholds, and latch functionality-making it irreplaceable in high-voltage, field-deployable systems.

Availability

MAX6457UKD0C is available at Aetrix Electronics and suitable for automotive battery management, industrial DC-DC converter supervision, and telecom power shelf protection requiring stable component supply across extended temperature and high-voltage operating conditions.

Supply support for MAX6457UKD0C 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 reliability and performance in demanding environments.

The MAX6457 series belongs to Maxim's high-voltage supervisor product line, engineered specifically for robust voltage monitoring in automotive, industrial, and telecom systems where wide input range, low power, and noise immunity are critical.

FAQ

What is the exact trip voltage range of MAX6457UKD0C at room temperature?

The MAX6457UKD0C has factory-trimmed thresholds: VTH+ = 1.093V and VTH− = 1.071V at −40°C to +85°C, corresponding to 8.3% hysteresis. At TA = +25°C, these values fall within the published min/max bounds (1.093V to 1.151V for VTH+, 1.071V to 1.151V for VTH−). These are absolute comparator input thresholds-not output logic levels-and define the voltage at IN+ where OUT transitions after the 50µs timeout.

Does MAX6457UKD0C support overvoltage detection only, or both overvoltage and undervoltage?

MAX6457UKD0C supports both overvoltage and undervoltage detection using the same comparator and IN+ input. When VIN+ rises above VTH+, OUT asserts low after 50µs (overvoltage action); when VIN+ falls below VTH−, OUT also asserts low after 50µs (undervoltage action). This dual-mode behavior is enabled by internal hysteresis and makes MAX6457UKD0C suitable for single-rail fault detection in battery and power-supply applications.

Can MAX6457UKD0C drive a microcontroller reset pin directly?

Yes, MAX6457UKD0C can drive a microcontroller reset pin directly when configured with an appropriate pullup resistor (e.g., 10kΩ to 3.3V or 5V). Its open-drain OUT sinks up to 250µA at VOL ≤ 0.4V, meeting standard CMOS/LVTTL reset input requirements. Ensure the microcontroller's reset pin is active-low and accepts open-drain drive; no level-shifter is needed if pullup voltage ≤ 28V and matches MCU logic voltage.

Is the CLEAR input required for normal operation of MAX6457UKD0C?

No, the CLEAR input is optional. For transparent (non-latched) operation, connect CLEAR to GND. If unused, CLEAR must be tied to GND-leaving it floating may cause erratic output behavior. Latched mode (CLEAR high) is only needed when persistent fault indication is required after an overvoltage event; most undervoltage monitoring applications use CLEAR = GND.

What is the maximum sink current capability of the OUT pin on MAX6457UKD0C?

The OUT pin of MAX6457UKD0C sinks up to 250µA while maintaining VOL ≤ 0.4V at TA = −40°C to +85°C and VCC ≥ 4.0V. At TA = −40°C to +125°C and VCC ≥ 4.0V, VOL remains ≤ 0.4V with 1mA sink current. Absolute maximum sink current is 20mA, but operation beyond 250µA–1mA degrades VOL and is not guaranteed across temperature.