Analog Devices Inc./Maxim Integrated MAX6378XR42-T

Overview

MAX6378XR42-T from Maxim Integrated is an ultra-low-power, active-low voltage detector with factory-trimmed 4.20V threshold, push-pull output, and SC70-3 package. It monitors VCC supply voltage in battery-powered systems and asserts OUT low when VCC drops below 4.20V ±2.5%, enabling precise brownout detection in portable medical devices, wearables, and IoT edge nodes.

For engineers reviewing the MAX6378XR42-T datasheet, MAX6378XR42-T pinout, MAX6378XR42-T application, or MAX6378XR42-T equivalent, key selection criteria include its 4.20V trip point, 500nA supply current, -40°C to +85°C operation, push-pull logic configuration, and immunity to sub-10µs VCC transients - all critical for reliable power monitoring in space-constrained, long-life applications.

Technical Context

The MAX6378XR42-T implements a precision bandgap reference and comparator architecture with internally trimmed resistors to set its 4.20V threshold. It operates down to 1.2V VCC while maintaining correct output state and ignores fast negative-going transients on VCC via built-in transient immunity circuitry.

This device belongs to the MAX6375–MAX6380 family of single-function reset supervisors. Unlike open-drain variants (e.g., MAX6380), it uses a push-pull output stage that actively drives both high and low, eliminating external pull-up components and simplifying interface to microcontrollers or FPGAs requiring clean, rail-to-rail reset signaling.

Key Specifications

Pinout & Package

MAX6378XR42-T is housed in a 3-pin SC70-3 package (2.0mm × 1.25mm × 0.95mm), optimized for ultra-compact PCB layouts in wearable and portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EC42DBZR and APX803S-42SA-7, the MAX6378XR42-T delivers superior energy efficiency (500nA vs. ≥0.9µA), wider VCC range (1.2V–5.5V), and guaranteed performance down to 1V - making it the optimal choice for multi-year battery life and deep brownout detection in portable electronics.

Availability

MAX6378XR42-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial wireless transmitters, smart wearable controllers, low-power IoT edge nodes, and battery-backed memory backup systems requiring stable component supply and long-term lifecycle support.

Supply support for MAX6378XR42-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and consumer applications.

The MAX6375–MAX6380 family was designed specifically for ultra-low-power voltage monitoring in battery-critical systems, delivering precision reset functionality with minimal footprint and zero external components.

FAQ

What is the exact factory-trimmed threshold voltage of the MAX6378XR42-T?

The MAX6378XR42-T has a nominal threshold voltage of 4.20V, with guaranteed tolerance of ±2.5% over the full -40°C to +85°C temperature range. This value is laser-trimmed at wafer test and confirmed in the Electrical Characteristics table under "Voltage Threshold" parameter (VTH = 4.20V typ, 4.095V min, 4.305V max at TA = -40°C to +85°C).

Does the MAX6378XR42-T require external components to operate?

No, the MAX6378XR42-T requires no external components. Its precision bandgap reference, comparator, and threshold-setting resistors are fully integrated and factory-trimmed. Only VCC, GND, and the OUT signal connection are needed - eliminating BOM cost and PCB area associated with discrete resistor dividers or pull-up networks.

What is the minimum VCC voltage at which the MAX6378XR42-T guarantees correct output logic state?

The MAX6378XR42-T guarantees correct output logic state (active-low assertion when VCC < VTH) down to 1.0V VCC, as stated in the General Description. The Electrical Characteristics table confirms functional operation from VCC = 1.2V to 5.5V, with full specification compliance over this range.

How does the MAX6378XR42-T handle fast transients on the VCC line?

The MAX6378XR42-T incorporates inherent transient immunity: the Typical Operating Characteristics graph "Maximum Transient Duration vs. Threshold Overdrive" shows it rejects negative-going VCC glitches ≤10µs in duration when VTH – VCC ≥ 100mV. This prevents false resets caused by switching regulator noise or ESD-induced supply disturbances.

Is the MAX6378XR42-T available in lead-free packaging?

Yes, the MAX6378XR42-T is available in lead-free packaging. To order the RoHS-compliant version, replace the "-T" suffix with "+T", resulting in part number MAX6378XR42+T. Both versions share identical electrical specifications and SC70-3 package dimensions, with lead-free construction meeting JEDEC J-STD-020 reflow standards.