Analog Devices Inc./Maxim Integrated MAX6378XR43-T

Overview

MAX6378XR43-T from Maxim Integrated is an ultra-low-power, active-low voltage detector in SC70-3 package, with factory-trimmed 4.30V threshold (±2.5% over temperature), 500nA supply current, and push-pull output. It monitors VCC in battery-powered systems and asserts OUT low when supply drops below threshold-used for precision brownout detection in portable medical devices and IoT sensors.

For engineers reviewing the MAX6378XR43-T datasheet, MAX6378XR43-T pinout, MAX6378XR43-T application, or MAX6378XR43-T equivalent, this page delivers verified threshold accuracy, transient immunity specs, SC70-3 footprint compatibility, and direct substitution guidance for 4.3V system monitoring designs.

Technical Context

The MAX6378XR43-T integrates a precision bandgap reference, comparator, and laser-trimmed resistive divider to deliver fixed 4.30V detection without external components. Its internal hysteresis of 9.5mV prevents chatter during slow VCC decay.

Designed for single-function reset assertion, it guarantees correct logic state down to 1V VCC and rejects transients ≤200µs at 100mV overdrive. The push-pull output drives loads directly without pull-up resistors, simplifying interface with microcontrollers and FPGAs.

Key Specifications

Pinout & Package

MAX6378XR43-T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm), optimized for space-constrained portable PCBs. Pin 1 = GND, Pin 2 = OUT, Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB33DBZR and TPS3808G33DBVR, the MAX6378XR43-T uniquely combines 4.30V precision threshold, 500nA supply current, SC70-3 size, and push-pull output - making it the only drop-in solution for space- and power-constrained 4.3V brownout detection without layout or firmware changes.

Availability

MAX6378XR43-T is available at Aetrix Electronics and suitable for wearable health monitors, industrial wireless sensors, and smart meter battery backup systems requiring stable component supply and long-term lifecycle support.

Supply support for MAX6378XR43-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, sensing, and interface applications - with emphasis on reliability, integration, and low-power performance.

The MAX6375–MAX6380 family was engineered specifically for ultra-low-power voltage monitoring in battery-critical systems - delivering factory-trimmed thresholds, nanoscale ICC, and robust transient rejection in minimal footprints.

FAQ

What is the exact reset threshold voltage of MAX6378XR43-T and its tolerance over temperature?

The MAX6378XR43-T has a nominal reset threshold of 4.30V, with ±2.5% accuracy guaranteed over the full -40°C to +85°C operating range. This value is factory-laser-trimmed and does not require external calibration. At +25°C, typical threshold is 4.30V, and the device maintains this specification without drift exceeding the stated tolerance across temperature extremes - critical for consistent brownout behavior in outdoor deployments.

Does MAX6378XR43-T require external components to operate?

No, the MAX6378XR43-T requires zero external components. Its precision bandgap reference, comparator, and trimmed resistor network are fully integrated. Unlike adjustable supervisors, it needs only VCC, GND, and a load on OUT - eliminating resistors, capacitors, and layout uncertainty. This integration reduces total solution size by ≥30% compared to discrete threshold solutions and removes calibration steps during manufacturing.

What is the output configuration of MAX6378XR43-T and how does it interface with a microcontroller?

The MAX6378XR43-T features an active-low push-pull output. When VCC drops below 4.30V, OUT drives low (≤0.4V at 100µA sink); otherwise, it drives high (≥0.8×VCC). This allows direct connection to standard CMOS reset inputs (e.g., STM32 NRST, ESP32 CHIP_PU) without pull-up resistors. The push-pull structure ensures fast rise/fall times and eliminates weak-state contention common with open-drain alternatives.

How does MAX6378XR43-T handle power supply transients, and what is its maximum tolerable glitch duration?

The MAX6378XR43-T ignores fast negative-going VCC transients up to 200µs in duration when the overdrive (VTH – VCC) is 100mV - per the Maximum Transient Duration vs. Threshold Overdrive curve in the datasheet. This built-in immunity prevents false resets caused by switching noise or load dumps. For example, at 150mV overdrive, the maximum allowed glitch is ~120µs - enabling reliable operation in automotive-grade DC/DC environments without added filtering.

Is MAX6378XR43-T available in both leaded and lead-free packaging, and how is lead-free ordering specified?

Yes, MAX6378XR43-T is offered in both leaded and lead-free versions. To order the lead-free variant, replace the "-T" suffix with "+T", resulting in MAX6378XR43+T. Both versions use tape-and-reel packaging exclusively and share identical electrical specifications and SC70-3 mechanical dimensions. Lead-free units comply with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1).