Analog Devices Inc./Maxim Integrated MAX6378XR46

Overview

MAX6378XR46 from Maxim Integrated is an ultra-low-power, active-low voltage detector IC designed for precision power-supply monitoring in battery-powered systems. It features a factory-trimmed 4.63V threshold (±2.5% over temperature), 500nA supply current, push-pull output, and operates from 1.2V to 5.5V VCC - ideal for supervising 5V rail integrity in portable medical devices.

For engineers reviewing the MAX6378XR46 datasheet, MAX6378XR46 pinout, MAX6378XR46 application, or MAX6378XR46 equivalent, key selection criteria include reset threshold accuracy, transient immunity, SC70-3 package footprint, and compatibility with low-voltage microcontroller reset inputs requiring active-low assertion.

Technical Context

The MAX6378XR46 implements a precision bandgap reference and comparator with internally trimmed resistors to set its 4.63V trip point. Its push-pull output drives logic-low when VCC falls below threshold, with guaranteed correct state down to 1V VCC.

It rejects fast negative-going VCC transients via built-in hysteresis (9.5µs propagation delay) and exhibits ±2.5% threshold accuracy across –40°C to +85°C. No external components are required for basic reset generation.

Key Specifications

Pinout & Package

MAX6378XR46 is housed in a 3-pin SC70 package (2.0mm × 2.1mm, 0.5mm pitch). The package is RoHS-compliant and available in lead-free variant (replace "-T" with "+T" in ordering code).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB33DBVR and APX803S-46SA-7, MAX6378XR46 uniquely combines 4.63V precision, 500nA current, and SC70-3 footprint - making it optimal for space-constrained, long-life 5V rail supervision where push-pull drive simplifies reset interface design.

Availability

MAX6378XR46 is available at Aetrix Electronics and suitable for battery-powered medical monitors, industrial PLC I/O modules, USB-C portable instruments, and smart energy meter RTC backup systems requiring stable component supply and long-term lifecycle support.

Supply support for MAX6378XR46 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 industrial, automotive, communications, and computing applications.

The MAX6375–MAX6380 family delivers ultra-low-power voltage detection for battery and power-supply monitoring, targeting portable, energy-sensitive systems where size, current, and accuracy are critical.

FAQ

What is the exact reset threshold voltage of MAX6378XR46 and how tightly is it specified?

The MAX6378XR46 has a nominal reset threshold of 4.63V, with ±2.5% accuracy guaranteed over the full operating temperature range of –40°C to +85°C. This specification is factory-trimmed and does not require external calibration. The threshold hysteresis is approximately 10mV, and the device maintains valid output logic state down to 1V VCC. These values are confirmed in the Electrical Characteristics table of the official MAX6375–MAX6380 datasheet.

Does MAX6378XR46 require any external components to function as a voltage supervisor?

No, MAX6378XR46 requires no external components to operate as a voltage supervisor. Its precision bandgap reference, comparator, and threshold-setting resistors are fully integrated and factory-trimmed. The device functions autonomously with only VCC, GND, and OUT connections - eliminating BOM cost, layout area, and calibration effort compared to discrete solutions.

What is the output configuration of MAX6378XR46 and how does it interface with a microcontroller reset pin?

MAX6378XR46 features an active-low push-pull output. When VCC falls below 4.63V, OUT asserts logic-low; when VCC rises above threshold plus hysteresis, OUT returns to logic-high. This push-pull structure drives the reset pin directly without needing an external pull-up resistor - simplifying interface with standard µC reset inputs such as those on STM32, PIC, or MSP430 families.

How does MAX6378XR46 handle power supply transients, and what is its immunity specification?

MAX6378XR46 is designed to ignore fast negative-going VCC transients. Its propagation delay is 9.5µs, and the Typical Operating Characteristics graph "Maximum Transient Duration vs. Threshold Overdrive" shows it rejects glitches shorter than ~5µs at 4.63V threshold. This immunity prevents false resets in electrically noisy environments like motor-driven or switching-power-supply systems where MAX6378XR46 is commonly deployed.

Is MAX6378XR46 available in both leaded and lead-free packaging, and what is the ordering code difference?

Yes, MAX6378XR46 is available in both leaded and lead-free packaging. The standard ordering code MAX6378XR46-T denotes leaded packaging; to specify lead-free, replace the "-T" suffix with "+T", resulting in MAX6378XR46+T. Both variants use the SC70-3 package and share identical electrical specifications, thermal performance, and footprint - enabling seamless transition to RoHS-compliant manufacturing.