Analog Devices Inc./Maxim Integrated MAX6378XR44+

Overview

MAX6378XR44+ from Maxim Integrated is an ultra-low-power, active-low voltage detector IC designed for precision supply monitoring in battery-powered systems. It features a factory-trimmed 4.38V threshold (±2.5% over temperature), 500nA supply current, push-pull output, and operates down to 1V VCC - enabling reliable brownout detection in portable medical devices and low-power IoT sensors.

For engineers reviewing the MAX6378XR44+ datasheet, MAX6378XR44+ pinout, MAX6378XR44+ application, or MAX6378XR44+ equivalent, this page delivers verified electrical parameters, SC70-3 package details, real-world use cases, and validated alternative parts for supply-chain continuity and design flexibility.

Technical Context

The MAX6378XR44+ integrates a precision bandgap reference, comparator, and laser-trimmed resistive divider to deliver fixed 4.38V detection without external components. Its internal hysteresis (100mV) prevents chatter during slow VCC decay, and transient immunity rejects glitches ≤200µs at 100mV overdrive.

This device asserts an active-low push-pull output when VCC falls below 4.38V and holds valid logic state down to 1V supply - ensuring deterministic reset behavior across full industrial temperature range (–40°C to +85°C) with ±2.5% threshold accuracy.

Key Specifications

Pinout & Package

MAX6378XR44+ is housed in a 3-pin SC70-3 package (JEDEC MO-203AA), with 100% lead-free finish (denoted by '+' suffix). The compact 2.0mm × 1.25mm footprint supports high-density placement and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB33DBVR and TPS3808G33DBVR, the MAX6378XR44+ provides exact 4.38V detection in a minimal 3-pin SC70 package with industry-leading 500nA IQ - making it uniquely suited for space- and power-constrained 4.5V system monitoring where pin count and threshold precision are non-negotiable.

Availability

MAX6378XR44+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, and smart wearable chargers requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX6378XR44+ 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 connectivity applications - with emphasis on ultra-low-power, high-reliability solutions for demanding environments.

The MAX6375–MAX6380 family was engineered specifically for battery voltage monitoring and supply supervision in space-constrained, energy-harvested, and portable systems - delivering factory-trimmed accuracy without external components.

FAQ

What is the exact reset threshold voltage of the MAX6378XR44+?

The MAX6378XR44+ has a factory-trimmed nominal reset threshold of 4.38V, with guaranteed accuracy of ±2.5% over the full industrial temperature range (–40°C to +85°C). This value is laser-trimmed during production and does not require external calibration. The MAX6378XR44+ maintains this specification while consuming only 500nA, making it ideal for precision 4.5V rail monitoring in battery-critical applications.

Does the MAX6378XR44+ require external components to operate?

No, the MAX6378XR44+ requires no external components - its precision bandgap reference, comparator, and trimmed resistor network are fully integrated. Unlike discrete supervisor circuits, the MAX6378XR44+ functions immediately upon connection of VCC and GND, with OUT asserting directly to drive a microcontroller reset pin. This integration eliminates BOM cost, layout area, and calibration risk - confirmed in the device's "No External Components" feature and absolute maximum ratings table.

What package type and dimensions does the MAX6378XR44+ use?

The MAX6378XR44+ uses the 3-pin SC70-3 package (JEDEC MO-203AA), measuring 2.0mm × 1.25mm × 0.9mm with a 0.65mm pin pitch. The '+' suffix confirms 100% lead-free finish per JEDEC J-STD-609. This package is distinct from the SOT23-3 variant (used in UR-suffixed versions) and is optimized for high-density PCB assembly in wearables and miniature sensors - verified in the Pin Configuration diagram and Package Information section of the datasheet.

How does the MAX6378XR44+ behave during fast VCC transients?

The MAX6378XR44+ is designed to ignore fast negative-going VCC transients: it suppresses output pulses for glitches up to 200µs in duration when the overdrive (VTH – VCC) is 100mV, as shown in the "Maximum Transient Duration vs. Threshold Overdrive" graph. This immunity prevents false resets in electrically noisy environments such as motor-driven or RF-intensive systems - a key differentiator from basic comparators and confirmed in the Applications Information section.

Is the MAX6378XR44+ compatible with 1.8V logic interfaces?

Yes, the MAX6378XR44+ remains fully functional with VCC as low as 1.2V and guarantees correct output logic state down to 1V - meaning its push-pull output can interface directly with 1.8V microcontrollers even during brownout conditions. When VCC ≥1.2V, the output high voltage (VOH) exceeds 0.8×VCC and output low (VOL) stays below 0.4V, satisfying standard 1.8V CMOS input thresholds. This behavior is specified in the Electrical Characteristics table under VOH/VOL conditions.