Analog Devices Inc./Maxim Integrated MAX6378XR39-T

Overview

MAX6378XR39-T 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 3.90V threshold (±2.5% over temperature), 500nA supply current, push-pull output, and operates from 1.2V to 5.5V VCC - enabling reliable brownout detection in portable medical devices and low-power microcontroller reset circuits.

For engineers reviewing the MAX6378XR39-T datasheet, MAX6378XR39-T pinout, MAX6378XR39-T application, or MAX6378XR39-T equivalent, this device delivers verified threshold accuracy, transient-immune operation, and SC70-3 footprint compatibility - critical for space-constrained, long-life battery applications requiring guaranteed logic state down to 1V VCC.

Technical Context

The MAX6378XR39-T implements a precision bandgap reference and comparator with internally trimmed resistors to set its 3.90V trip point. Its push-pull output asserts low when VCC falls below VTH and remains valid down to 1V supply, eliminating external pull-up components.

Designed for immunity to fast VCC transients, it tolerates negative-going glitches up to 140µs at 10mV overdrive (VTH − VCC), per typical operating characteristics. Propagation delay is 9.5µs (falling) and 6.3µs (rising) across −40°C to +85°C.

Key Specifications

Pinout & Package

MAX6378XR39-T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm), optimized for high-density PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB39DBVR and TPS3808G39DBVR, the MAX6378XR39-T uniquely combines SC70-3 size, 500nA current, and push-pull output - making it optimal for ultra-compact, single-cell–powered designs where board area and component count are constrained.

Availability

MAX6378XR39-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial I/O modules, wearables with Li+ charging, and smart meter battery backup systems requiring stable component supply and long-term lifecycle support.

Supply support for MAX6378XR39-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 and integration.

The MAX6375–MAX6380 family targets ultra-low-power voltage supervision in space- and energy-constrained systems, delivering factory-trimmed thresholds and sub-µA operation without external components.

FAQ

What is the exact factory-trimmed threshold voltage of MAX6378XR39-T?

The MAX6378XR39-T has a nominal threshold voltage of 3.90V, with ±2.5% tolerance over the full −40°C to +85°C operating temperature range. This value is laser-trimmed at wafer test and confirmed in Table 1 of the datasheet under suffix "R39". The MAX6378XR39-T is part of the 3.30V–4.63V threshold group, and its 3.90V point is optimized for monitoring 3.3V/3.6V Li+ battery systems.

Does MAX6378XR39-T require an external pull-up resistor on its OUT pin?

No, the MAX6378XR39-T features an active-low push-pull output, meaning it actively drives both high and low states without external components. Unlike open-drain variants (e.g., MAX6380), the MAX6378XR39-T's OUT pin can directly interface with CMOS inputs, microcontroller /RESET pins, or enable logic - simplifying design and reducing BOM count.

What is the minimum VCC voltage at which MAX6378XR39-T guarantees correct output logic state?

The MAX6378XR39-T guarantees correct output logic state (i.e., OUT = low when VCC < VTH, OUT = high when VCC > VTH) down to 1.0V VCC. This is explicitly stated in the General Description and confirmed in the Absolute Maximum Ratings table - enabling reliable operation during deep brownout, cold start, or ultra-low-power sleep modes.

How does MAX6378XR39-T handle short voltage transients on the VCC line?

The MAX6378XR39-T incorporates built-in transient immunity: it ignores negative-going VCC glitches up to 140µs duration when the overdrive (VTH − VCC) is 10mV, per the Typical Operating Characteristics graph (MAX6375-04). This prevents false resets caused by switching noise or load transients, ensuring robust operation in electrically noisy environments like motor-driven industrial equipment.

Is MAX6378XR39-T available in lead-free packaging, and how is it ordered?

Yes, MAX6378XR39-T is available in lead-free packaging. To order the lead-free version, replace the "-T" suffix with "+T", resulting in MAX6378XR39+T. Both versions are supplied in tape-and-reel format only, with standard order increments of 2500 pieces for marked variants (per Selector Guide). The SC70-3 package used by MAX6378XR39-T complies with RoHS and JEDEC standards.