Analog Devices Inc./Maxim Integrated MAX6378XR33

Overview

MAX6378XR33 from Maxim Integrated is an ultra-low-power, active-low voltage detector with a factory-trimmed 3.30V threshold, push-pull output, and SC70-3 package. It monitors VCC supply voltage and asserts OUT low when VCC falls below 3.30V ±2.5%, enabling reliable power-fail detection in battery-powered systems. Key parameters include 500nA supply current, 9.5µs propagation delay (falling), and operation down to 1V VCC.

For engineers reviewing the MAX6378XR33 datasheet, MAX6378XR33 pinout, MAX6378XR33 application, or MAX6378XR33 equivalent, this device is selected for precision reset generation in portable equipment where ultra-low quiescent current, transient immunity, and guaranteed logic state at low VCC are critical design requirements.

Technical Context

The MAX6378XR33 implements a precision bandgap reference and comparator with internally trimmed resistors to set its 3.30V trip point. Its push-pull output drives actively high or low without external pull-up, eliminating board-level components.

Designed for immunity to fast VCC transients, it ignores negative-going glitches up to duration limits defined by threshold overdrive (e.g., ≤100µs for 100mV overdrive). Guaranteed correct output logic state is maintained for VCC as low as 1V, supporting brownout detection during deep discharge.

Key Specifications

Pinout & Package

MAX6378XR33 is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm), optimized for space-constrained portable designs. The package is lead-free compatible and supplied in tape-and-reel format.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB33DBZR and TPS3808G33DBVR, the MAX6378XR33 uniquely combines ultra-low 500nA supply current, SC70-3 footprint, and push-pull active-low output-enabling component count reduction and extended battery life without sacrificing reset reliability or board space.

Availability

MAX6378XR33 is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, and smart wearable controllers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MAX6378XR33 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 external components and guaranteed behavior down to 1V supply.

FAQ

What is the exact factory-trimmed threshold voltage of MAX6378XR33?

The MAX6378XR33 has a nominal threshold voltage of 3.30V, with tolerance of ±2.5% over the full operating temperature range (-40°C to +85°C). At +25°C, the typical value is 3.30V, and the min/max specification limits are 3.217V and 3.383V respectively, as confirmed in Table 1 of the official datasheet.

Does MAX6378XR33 require an external pull-up resistor on its OUT pin?

No, MAX6378XR33 does not require an external pull-up resistor because it features an active-low push-pull output. Unlike open-drain detectors, the MAX6378XR33 actively drives both high and low states on the OUT pin, enabling direct connection to microcontroller reset inputs without additional components.

What is the minimum VCC voltage at which MAX6378XR33 guarantees correct output logic state?

The MAX6378XR33 guarantees correct output logic state - i.e., OUT remains low when VCC is below VTH and high when above - for VCC as low as 1V. This is explicitly specified in the General Description and Electrical Characteristics sections of the datasheet, supporting robust operation during deep brownout conditions.

Can MAX6378XR33 be used with a 1.8V supply rail?

Yes, MAX6378XR33 can monitor a 1.8V supply rail, but only if that rail is also its VCC source. Its VCC operating range is 1.2V to 5.5V, so 1.8V is within spec. However, it will assert reset when that same 1.8V rail drops below 3.30V - which is impossible. Therefore, MAX6378XR33 is intended for monitoring rails ≥3.3V, such as 3.3V or 5V supplies.

What package type and dimensions does MAX6378XR33 use?

MAX6378XR33 uses the SC70-3 package: a 3-pin surface-mount package measuring 2.0mm × 2.1mm × 0.95mm. Pin configuration is GND (pin 1), OUT (pin 2), VCC (pin 3), matching the top-view diagram in the datasheet. It is supplied in tape-and-reel format and available in lead-free variant (replace "-T" with "+T" in ordering code).