Analog Devices Inc./Maxim Integrated MAX6375UR31

Overview

MAX6375UR31 from Maxim Integrated is an ultra-low-power, 3-pin SOT23-3 voltage detector IC designed for precision supply monitoring in battery-powered systems. It features a factory-trimmed 3.08V threshold (±2.5% over temperature), active-low push-pull output, 500nA supply current at +25°C, and guaranteed operation down to VCC = 1V. It is used in portable equipment to trigger reset or power-fail signaling when input voltage drops below the preset level.

For engineers reviewing the MAX6375UR31 datasheet, MAX6375UR31 pinout, MAX6375UR31 application, or MAX6375UR31 equivalent, key selection criteria include its 3.08V trip point, SOT23-3 footprint, push-pull active-low output drive capability, transient immunity up to 200µs at 100mV overdrive, and compatibility with 1.2V–5.5V supply rails.

Technical Context

The MAX6375UR31 implements a precision bandgap reference and comparator with internally trimmed resistors to set its 3.08V detection threshold. Its output asserts low when VCC falls below VTH and remains valid down to 1V supply - enabling reliable brownout detection even during deep discharge.

It features built-in hysteresis (100mV typical), ±2.5% threshold accuracy across –40°C to +85°C, and immunity to fast negative-going transients on VCC - validated by the Maximum Transient Duration vs. Threshold Overdrive curve showing no false triggering for ≤200µs glitches at 100mV under VTH.

Key Specifications

Pinout & Package

MAX6375UR31 is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint and 0.95mm height - optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EC30DBZR and APX803S-30SA-7, the MAX6375UR31 delivers the lowest ICC (500nA), tightest tempco (40ppm/°C), and identical SOT23-3 pinout - making it optimal for ultra-long-life, high-accuracy battery monitoring where minimal bill-of-materials and deterministic reset timing are essential.

Availability

MAX6375UR31 is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, wearable fitness trackers, and smart home smoke detectors requiring stable component supply across extended production lifecycles.

Supply support for MAX6375UR31 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 supply monitoring in space- and energy-constrained portable electronics - delivering precision voltage detection without external components or calibration.

FAQ

What is the exact reset threshold voltage of the MAX6375UR31?

The MAX6375UR31 has a factory-trimmed nominal reset threshold of 3.08V, with ±2.5% accuracy over the full operating temperature range of –40°C to +85°C. This value is laser-trimmed during wafer test and does not require external adjustment. The MAX6375UR31 is part of the MAX6375 series, which covers thresholds from 2.20V to 3.08V in ~100mV steps - and the "R31" suffix explicitly denotes the 3.08V variant.

Does the MAX6375UR31 require external components to operate?

No, the MAX6375UR31 requires no external components. Its precision bandgap reference, comparator, and threshold-setting resistors are fully integrated and factory-trimmed. The device operates with only three connections: VCC, GND, and OUT. This eliminates calibration parts, reduces PCB area, and improves long-term reliability - a core design goal of the MAX6375UR31 and the broader MAX6375–MAX6380 family.

What is the output configuration of the MAX6375UR31, and how does it interface with a microcontroller?

The MAX6375UR31 features an active-low push-pull output, meaning OUT goes logic low when VCC falls below 3.08V and returns high when VCC rises above threshold plus hysteresis. It can directly drive standard CMOS reset inputs without a pull-up resistor - sinking ≥100µA and sourcing ≥500µA. This simplifies interface to MCUs such as STM32, nRF52, or EFM32, where the MAX6375UR31's output connects straight to the RESET pin.

Can the MAX6375UR31 operate reliably at very low supply voltages?

Yes, the MAX6375UR31 guarantees correct output logic state down to VCC = 1V - well below its 3.08V trip point. This allows it to assert reset even during deep battery discharge, ensuring deterministic behavior in applications like coin-cell–powered sensors. Its internal circuitry remains functional and accurate across the full 1.2V–5.5V supply range, and the MAX6375UR31 is specified to maintain ±2.5% threshold accuracy from –40°C to +85°C at all valid VCC levels.

How does the MAX6375UR31 handle power-supply transients?

The MAX6375UR31 incorporates built-in transient immunity: it ignores fast negative-going VCC glitches up to 200µs in duration when the overdrive (VTH – VCC) is 100mV - as confirmed in the Typical Operating Characteristics graph (MAX6375-04). This prevents false resets caused by switching noise, load dumps, or coupling spikes. The MAX6375UR31 achieves this through internal filtering and comparator hysteresis (100mV typical), making it robust in electrically noisy environments like motor-driven IoT nodes or industrial gateways.