Analog Devices Inc./Maxim Integrated MAX6378XR33-T

Overview

MAX6378XR33-T from Maxim Integrated is an ultra-low-power, 3-pin voltage detector IC with a factory-trimmed 3.30V threshold, push-pull active-low output, and SC70-3 package. It monitors VCC supply voltage and asserts OUT low when VCC falls below 3.30V ±2.5%, supporting precision power-supply monitoring in battery-powered systems. Its 500nA supply current and immunity to fast transients make it suitable for portable medical sensors and low-power microcontroller reset supervision.

For engineers reviewing the MAX6378XR33-T datasheet, MAX6378XR33-T pinout, MAX6378XR33-T application, or MAX6378XR33-T equivalent, key selection criteria include its 3.30V trip point, ±2.5% threshold accuracy over temperature, 9.5µs propagation delay, SC70-3 footprint, and compatibility with 1.2V–5.5V VCC operation without external components.

Technical Context

The MAX6378XR33-T implements a precision bandgap reference and comparator with internally trimmed resistors to set a fixed 3.30V detection threshold. It guarantees correct output logic state down to VCC = 1V and ignores transients shorter than ~100µs at 100mV overdrive.

This device belongs to the MAX6375–MAX6380 family of single-function voltage detectors. Unlike open-drain variants (e.g., MAX6380), the MAX6378XR33-T uses a push-pull output stage, eliminating the need for an external pull-up resistor while delivering VOL ≤0.4V at ISINK = 100µA and VOH ≥0.8×VCC at ISOURCE = 500µA.

Key Specifications

Pinout & Package

MAX6378XR33-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 and RoHS-compliant, with tape-and-reel delivery standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3123QDBVRQ1 and APX803S-33SA-7, the MAX6378XR33-T delivers the lowest supply current (500nA vs. >900nA), enabling longest battery life, but offers no reset timeout or automotive qualification - making it optimal for cost-sensitive, space-constrained industrial and portable designs where minimal current and small footprint are primary.

Availability

MAX6378XR33-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wearables with BLE SoCs, and smart energy meters requiring stable component supply with long-term lifecycle support.

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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6375–MAX6380 series was designed specifically for ultra-low-power voltage monitoring in battery-critical systems, emphasizing nanoscale quiescent current, factory-trimmed accuracy, and minimal external component count.

FAQ

What is the exact threshold voltage and tolerance of the MAX6378XR33-T?

The MAX6378XR33-T has a nominal threshold voltage of 3.30V with a guaranteed tolerance of ±2.5% over the full operating temperature range of -40°C to +85°C. This specification is factory-trimmed and does not require external calibration. At +25°C, the typical threshold is 3.30V, and the min/max values across temperature are 3.217V and 3.383V respectively, as confirmed in Table 1 of the official datasheet.

Does the MAX6378XR33-T require an external pull-up resistor on its output?

No, the MAX6378XR33-T features an active-low push-pull output stage, meaning it actively drives both high and low states without needing an external pull-up resistor. When VCC is above 3.30V, OUT is driven high to ≥0.8×VCC; when VCC falls below threshold, OUT is driven low to ≤0.4V at 100µA sink current. This eliminates BOM cost and layout complexity compared to open-drain alternatives like the MAX6380.

What is the minimum VCC voltage at which the MAX6378XR33-T remains functional?

The MAX6378XR33-T is guaranteed to maintain correct output logic state down to VCC = 1V, per the datasheet's Absolute Maximum Ratings and Electrical Characteristics tables. While its specified operating range is 1.2V to 5.5V, functionality-including accurate threshold detection and valid output drive-is assured from 1.2V upward, with full performance (e.g., propagation delay, VOL) characterized from VCC ≥1.2V.

How does the MAX6378XR33-T handle power supply transients?

The MAX6378XR33-T is designed to ignore fast negative-going VCC transients. According to the Typical Operating Characteristics graph "Maximum Transient Duration vs. Threshold Overdrive", it rejects glitches shorter than ~100µs when VCC dips 100mV below threshold. This immunity prevents false resets during switching noise or load-step events, ensuring robust operation in electrically noisy environments without requiring additional filtering.

Is the MAX6378XR33-T available in lead-free packaging?

Yes, the MAX6378XR33-T is available in lead-free packaging. Per the Ordering Information section, lead-free versions are denoted by replacing the "-T" suffix with "+T" (i.e., MAX6378XR33+T). The standard -T version is leaded; the +T variant complies with RoHS directives and uses matte-tin plating. Both versions share identical electrical specifications and SC70-3 mechanical dimensions.