Analog Devices Inc./Maxim Integrated MAX6378XR45-T

Overview

MAX6378XR45-T from Maxim Integrated is an ultra-low-power, active-low voltage detector with factory-trimmed 4.50V threshold, push-pull output, and SC70-3 package. It monitors VCC supply voltage and asserts logic-low OUT when VCC falls below 4.50V ±2.5%, enabling reliable power-fail detection in battery-backed systems. Designed for precision reset generation in portable medical sensors and low-power IoT nodes.

For engineers reviewing the MAX6378XR45-T datasheet, MAX6378XR45-T pinout, MAX6378XR45-T application, or MAX6378XR45-T equivalent, this page delivers verified electrical parameters, validated SC70-3 pin mapping, real-world use cases in battery monitoring and power sequencing, and two confirmed alternative parts with documented functional differences.

Technical Context

The MAX6378XR45-T implements a precision bandgap reference and comparator with internally trimmed resistors to set its 4.50V trip point. Its push-pull output drives logic-low directly without external pull-up, supporting immediate microcontroller reset assertion. The device guarantees correct output state down to VCC = 1V and rejects transients ≤9.5µs at 100mV overdrive.

It belongs to the MAX6375–MAX6380 family of single-function voltage detectors optimized for minimal quiescent current (500nA typical) and zero external components. Threshold accuracy is ±2.5% over -40°C to +85°C, and propagation delay is specified at 9.5µs (falling edge) under full temperature range.

Key Specifications

Pinout & Package

MAX6378XR45-T is housed in a 3-pin SC70-3 package (2.0mm × 1.25mm × 0.9mm), compatible with high-density PCB layouts and reflow soldering. Pin 1 is GND, Pin 2 is OUT, Pin 3 is VCC - identical pinout to SOT23-3 but with smaller footprint and thermal profile.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB33DBZR and TPS3808G33DBVR, the MAX6378XR45-T offers exact 4.50V threshold matching, lowest ICC (500nA), and smallest SC70-3 footprint - making it optimal for space-constrained, long-life 4.5V rail monitoring where fixed timing and minimal BOM are critical.

Availability

MAX6378XR45-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and industrial control modules requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX6378XR45-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

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, automotive, and consumer markets.

The MAX6375–MAX6380 series was developed specifically for ultra-low-power voltage monitoring in battery-critical systems, emphasizing zero external components, guaranteed sub-1V operation, and factory-trimmed thresholds from 2.20V to 4.63V.

FAQ

What is the exact factory-trimmed threshold voltage of MAX6378XR45-T?

The MAX6378XR45-T has a nominal threshold voltage of 4.50V, with ±2.5% accuracy over the full -40°C to +85°C temperature range. This value is laser-trimmed at wafer test and confirmed in Table 1 of the datasheet under suffix R45. The MAX6378XR45-T is part of the MAX6378 variant group, which covers 3.30V–4.63V thresholds in ~100mV steps.

Does MAX6378XR45-T require an external pull-up resistor on the OUT pin?

No, the MAX6378XR45-T features an active-low push-pull output, meaning it actively drives logic-low when VCC falls below 4.50V and high-impedance (not driven) otherwise. Unlike open-drain variants (e.g., MAX6380), the MAX6378XR45-T does not require an external pull-up resistor - simplifying design and reducing component count.

What is the maximum VCC transient duration that MAX6378XR45-T can ignore?

The MAX6378XR45-T ignores negative-going VCC transients up to 9.5µs in duration when the overdrive (VTH – VCC) is 100mV. As overdrive increases, allowable pulse width decreases - e.g., at 200mV overdrive, the limit drops to ~4µs. This immunity prevents false resets during switching regulator noise or ESD coupling.

Is MAX6378XR45-T available in lead-free packaging?

Yes, MAX6378XR45-T is offered in lead-free packaging. To order the RoHS-compliant version, replace the "-T" suffix with "+T", resulting in MAX6378XR45+T. Both versions share identical electrical specifications, SC70-3 package dimensions, and thermal performance - only the plating composition differs.

What is the minimum VCC voltage at which MAX6378XR45-T guarantees correct output logic state?

The MAX6378XR45-T guarantees correct output logic state (i.e., OUT = low when VCC < VTH, high impedance otherwise) down to VCC = 1.0V. This specification ensures reliable reset assertion even during deep battery discharge or cold-start scenarios where supply voltage may dip below typical logic thresholds.