Analog Devices Inc./Maxim Integrated MAX6378XR40-T

Overview

MAX6378XR40-T from Maxim Integrated is an ultra-low-power, active-low voltage detector with factory-trimmed 4.00V threshold, push-pull output, and SC70-3 package. It monitors VCC supply voltage in battery-powered systems and asserts OUT low when VCC drops below 4.00V ±2.5%, supporting precision power-supply monitoring in portable equipment with 500nA supply current.

For engineers reviewing the MAX6378XR40-T datasheet, MAX6378XR40-T pinout, MAX6378XR40-T application, or MAX6378XR40-T equivalent, this device serves as a single-function reset supervisor for 3.3V–5V regulated rails where low quiescent current, transient immunity, and guaranteed logic state down to 1V are critical selection criteria.

Technical Context

The MAX6378XR40-T implements a precision bandgap reference and comparator with internally trimmed resistors to set its 4.00V trip point. Its push-pull output drives low actively during undervoltage conditions and remains valid down to VCC = 1V, eliminating external pull-up components.

Designed to reject fast transients, it guarantees no false triggering for negative-going VCC glitches up to 100µs at 100mV overdrive. Propagation delay is 9.5µs (typ) for falling edge and exhibits ±2.5% threshold accuracy across –40°C to +85°C.

Key Specifications

Pinout & Package

MAX6378XR40-T 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 compliant 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 TLV803EC40DBZR and APX803S-40SA-7, the MAX6378XR40-T delivers optimal balance of ultra-low ICC (500nA), tight threshold accuracy (±2.5%), and push-pull simplicity-making it preferred for space- and power-constrained applications requiring minimal external components and guaranteed 1V operation.

Availability

MAX6378XR40-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home battery gateways, and automotive body control units requiring stable component supply with long-term lifecycle support.

Supply support for MAX6378XR40-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 in industrial, automotive, and consumer markets.

The MAX6375–MAX6380 family was engineered specifically for ultra-low-power voltage supervision in battery-critical systems, emphasizing sub-µA quiescent current, factory-trimmed thresholds, and robust transient immunity in miniature SC70/SOT23 packages.

FAQ

What is the exact reset threshold voltage of the MAX6378XR40-T?

The MAX6378XR40-T has a nominal reset threshold of 4.00V, with ±2.5% accuracy over the full operating temperature range (–40°C to +85°C). This means the actual trip point falls between 3.90V and 4.10V at +25°C, and between 3.900V and 4.100V across temperature per the datasheet's min/max specifications. The "R40" suffix explicitly denotes the 4.00V factory-trimmed version of the MAX6378XR40-T.

Does the MAX6378XR40-T require any external components to operate?

No, the MAX6378XR40-T requires no external components. Its precision bandgap reference, comparator, and threshold-setting resistors are fully integrated and factory-trimmed. The push-pull output eliminates the need for an external pull-up resistor, unlike open-drain alternatives. Only VCC, GND, and the OUT signal connection are needed for basic operation of the MAX6378XR40-T.

What is the minimum VCC voltage at which the MAX6378XR40-T guarantees correct output logic state?

The MAX6378XR40-T guarantees correct output logic state-i.e., OUT remains low when VCC < VTH and high when VCC ≥ VTH + hysteresis-down to VCC = 1V. This is explicitly specified in the datasheet and enables reliable brownout detection even during deep battery discharge, a key design feature distinguishing the MAX6378XR40-T from many competing supervisors.

How does the MAX6378XR40-T handle power supply transients?

The MAX6378XR40-T incorporates built-in transient immunity: it ignores negative-going VCC glitches up to 100µs in duration when the overdrive (VTH – VCC) is 100mV. This is confirmed by the "Maximum Transient Duration vs. Threshold Overdrive" graph in the datasheet. As overdrive increases, allowable pulse width decreases-ensuring the MAX6378XR40-T avoids false resets in electrically noisy environments like motor drives or switching regulators.

Is the MAX6378XR40-T available in lead-free packaging?

Yes, the MAX6378XR40-T is available in lead-free packaging. Per Maxim's ordering convention, replace the "-T" suffix with "+T" to specify lead-free (e.g., MAX6378XR40+T). The standard MAX6378XR40-T is RoHS-compliant and uses matte tin lead finish; both versions are supplied in tape-and-reel format and share identical electrical and thermal specifications.