Analog Devices Inc./Maxim Integrated MAX6378XR33+T

Overview

MAX6378XR33+T 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 3.30V threshold (±2.5% over temperature), 500nA supply current, push-pull output, and operates down to 1V VCC. It is used in portable equipment to assert reset signals when input voltage drops below the trip point.

For engineers reviewing the MAX6378XR33+T datasheet, MAX6378XR33+T pinout, MAX6378XR33+T application, or MAX6378XR33+T equivalent, key selection criteria include threshold accuracy, ultra-low quiescent current, transient immunity, SC70-3 package footprint, and compatibility with 3.3V system rails requiring reliable brownout detection.

Technical Context

The MAX6378XR33+T integrates a precision bandgap reference, comparator, and laser-trimmed resistive divider to deliver fixed 3.30V detection without external components. Its internal hysteresis (9.5mV) prevents output chatter during slow VCC decay.

It employs push-pull output logic (active-low), asserting OUT low when VCC falls below VTH and returning high when VCC recovers above VTH + hysteresis. The device ignores transients ≤200µs at 100mV overdrive, ensuring robust operation in noisy power environments.

Key Specifications

Pinout & Package

MAX6378XR33+T is housed in a lead-free 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm), optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB33DBVR and APX803S-33SA-7, the MAX6378XR33+T uniquely combines 500nA supply current, push-pull output, SC70-3 footprint, and ±2.5% threshold accuracy - making it optimal for space- and power-constrained 3.3V portable systems where BOM simplicity and long battery life are primary design goals.

Availability

MAX6378XR33+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, smart meter battery backup circuits, and wearable health monitors requiring stable component supply and long-term manufacturability.

Supply support for MAX6378XR33+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, with emphasis on high reliability and low power.

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

FAQ

What is the exact reset threshold voltage of MAX6378XR33+T and how stable is it over temperature?

The MAX6378XR33+T has a nominal reset threshold of 3.30V, with guaranteed accuracy of ±2.5% over the full -40°C to +85°C operating range. Its 40ppm/°C tempco ensures minimal drift across temperature, and hysteresis of 9.5mV prevents output oscillation during marginal supply conditions. This stability eliminates need for external calibration in most applications.

Does MAX6378XR33+T require any external components to function?

No, the MAX6378XR33+T requires zero external components. Its precision bandgap reference, comparator, and laser-trimmed resistor network are fully integrated. The push-pull output drives reset inputs directly - no pull-up resistor is needed. This reduces BOM count, PCB area, and assembly cost compared to open-drain alternatives.

What package type and dimensions does MAX6378XR33+T use?

MAX6378XR33+T is supplied in a lead-free 3-pin SC70-3 package measuring 2.0mm × 2.1mm × 0.95mm. This compact outline matches industry-standard footprint requirements and enables high-density placement in space-constrained designs such as hearing aids, wearables, and sensor nodes.

How does MAX6378XR33+T handle power supply transients?

The MAX6378XR33+T is designed to ignore fast negative-going VCC transients: it suppresses output pulses for glitches up to 200µs wide when the overdrive (VTH – VCC) is 100mV. This immunity prevents false resets caused by switching regulator noise or digital load transients, enhancing system robustness without external filtering.

What is the minimum supply voltage at which MAX6378XR33+T remains functional?

The MAX6378XR33+T guarantees correct output logic state down to VCC = 1.0V, and operates across a full range of 1.2V to 5.5V. This allows reliable brownout detection even during deep battery discharge or low-voltage startup sequences - critical for maintaining system integrity in portable and energy-harvesting applications.