Analog Devices Inc./Maxim Integrated MAX6378UR46

Overview

MAX6378UR46 from Maxim Integrated is an ultra-low-power, active-low voltage detector in SOT23-3 package, with factory-trimmed 4.63V 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 in precision brown-out detection for microcontrollers and power sequencing circuits.

For engineers reviewing the MAX6378UR46 datasheet, MAX6378UR46 pinout, MAX6378UR46 application, or MAX6378UR46 equivalent, key selection criteria include its 4.63V trip point, guaranteed operation down to 1V VCC, immunity to fast transients, and compatibility with 3.3V/5V logic interfaces without external pull-ups.

Technical Context

The MAX6378UR46 implements a precision bandgap reference and comparator with internally trimmed resistors to set its 4.63V threshold. Its push-pull output drives low actively during undervoltage events and returns high-Z only during normal operation-no external components required.

It features 9.5µs propagation delay (falling edge), ±2.5% threshold accuracy across –40°C to +85°C, and transient immunity validated up to 100µs at 100mV overdrive. The device operates from 1.2V to 5.5V VCC and maintains correct output state down to 1V.

Key Specifications

Pinout & Package

MAX6378UR46 is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), footprint-compatible with industry-standard SOT-23 layouts and reflow-solderable.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB33DBZR and TPS3808G33DBVR, the MAX6378UR46 uniquely delivers 4.63V threshold accuracy, 500nA current, and push-pull drive in SOT23-3-making it optimal for 5V-system brown-out protection without layout or BOM overhead.

Availability

MAX6378UR46 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control modules requiring stable component supply and long-term production continuity.

Supply support for MAX6378UR46 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 in industrial, automotive, and communications markets.

The MAX6375–MAX6380 family was engineered specifically for ultra-low-power voltage monitoring in battery-critical systems-prioritizing nanoscale current, factory-trimmed thresholds, and minimal external dependencies.

FAQ

What is the exact threshold voltage of the MAX6378UR46 and how accurate is it over temperature?

The MAX6378UR46 has a nominal threshold voltage of 4.63V, with ±2.5% accuracy guaranteed over the full –40°C to +85°C operating range. This specification is verified by design and production-tested at +25°C, with overtemperature limits ensured through characterization-not just simulation. The MAX6378UR46 maintains this tolerance without calibration or external trimming.

Does the MAX6378UR46 require an external pull-up resistor on its OUT pin?

No, the MAX6378UR46 features an active-low push-pull output, so it does not require an external pull-up resistor. Its OUT pin actively drives low when VCC falls below 4.63V and presents high-impedance otherwise-enabling direct connection to standard microcontroller reset inputs. This eliminates one passive component and associated layout area.

Can the MAX6378UR46 operate reliably when VCC drops below 2V?

Yes-the MAX6378UR46 is guaranteed to maintain correct output logic state down to VCC = 1V. Its internal bandgap reference and comparator remain functional throughout this range, ensuring deterministic reset assertion even during deep brown-out conditions common in depleted lithium batteries or unregulated power rails.

What is the propagation delay of the MAX6378UR46 and how does it vary with temperature?

The MAX6378UR46 has a typical falling-edge propagation delay of 9.5µs and rising-edge delay of 6.3µs at +25°C. These values remain stable across –40°C to +85°C, with no significant drift reported in the datasheet's Typical Operating Characteristics plots-ensuring consistent timing behavior in thermal cycling environments.

Is the MAX6378UR46 available in both leaded and lead-free packaging?

Yes-MAX6378UR46 is offered in both leaded and RoHS-compliant lead-free versions. To order the lead-free variant, replace the "-T" suffix with "+T" (e.g., MAX6378UR46+T). Both versions use the same SOT23-3 package outline and are compatible with standard reflow profiles.