Analog Devices Inc./Maxim Integrated MAX6375UR23+

Overview

MAX6375UR23+ from Maxim Integrated is an ultra-low-power, active-low voltage detector in SOT23-3 package, with factory-trimmed 2.32V threshold (±2.5% over temperature), 500nA supply current, and open-drain output. It monitors VCC supply voltage in portable battery-powered systems and asserts OUT low when voltage drops below threshold, enabling precise brownout detection in space-constrained applications.

For engineers reviewing the MAX6375UR23+ datasheet, MAX6375UR23+ pinout, MAX6375UR23+ application, or MAX6375UR23+ equivalent, key selection criteria include its 2.32V trip point, open-drain logic configuration, immunity to sub-20µs VCC transients, guaranteed operation down to 1V VCC, and compatibility with 3.3V/5V logic pull-up interfaces.

Technical Context

The MAX6375UR23+ implements a precision bandgap reference and comparator with internally trimmed resistors to set its 2.32V threshold-no external components required. Its open-drain output sinks up to 100µA at 0.4V (VOL) while VCC ≥ 1.2V, supporting flexible logic-level interfacing via external pull-up.

Designed for robustness in noisy environments, it rejects fast negative-going VCC transients: at 100mV overdrive (VTH − VCC = 100mV), it tolerates transients up to ~200µs without false triggering. Propagation delay is 6.3µs (falling) and 9.5µs (rising) across −40°C to +85°C.

Key Specifications

Pinout & Package

MAX6375UR23+ is housed in a 3-pin SOT23-3 package (lead-free, RoHS-compliant), with 1.3mm × 2.9mm footprint and 0.95mm height - 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 TLV803EB23DBZR and APX803S-23SA-7, the MAX6375UR23+ offers superior transient immunity (200µs rejection at 100mV overdrive vs. 120µs), tighter threshold accuracy (±2.5% vs. ±3%), and lower supply current than APX803S-23SA-7 - making it optimal for long-life, noise-sensitive portable designs.

Availability

MAX6375UR23+ is available at Aetrix Electronics and suitable for portable medical sensors, wearables with coin-cell power, industrial remote telemetry units, and smart home battery backup systems requiring stable component supply and long-term lifecycle support.

Supply support for MAX6375UR23+ 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, communications, and consumer applications.

The MAX6375–MAX6380 family was designed specifically for ultra-low-power voltage monitoring in battery-critical systems, emphasizing nanoscale quiescent current, factory-trimmed accuracy, and transient-hardened operation in minimal 3-pin packages.

FAQ

What is the exact threshold voltage of the MAX6375UR23+ and how stable is it over temperature?

The MAX6375UR23+ has a factory-trimmed nominal threshold voltage of 2.32V, with guaranteed accuracy of ±2.5% over the full industrial temperature range (−40°C to +85°C). Its temperature coefficient is 40ppm/°C, meaning total drift remains under ±12mV from −40°C to +85°C - ensuring repeatable brownout detection across environmental extremes. This specification is confirmed in the Electrical Characteristics table of the official MAX6375–MAX6380 datasheet.

Does the MAX6375UR23+ require an external pull-up resistor on the OUT pin?

Yes, the MAX6375UR23+ features an open-drain active-low output, so an external pull-up resistor is mandatory to establish a valid logic-high level on the OUT signal. The datasheet specifies that the pull-up may connect to any supply up to 5.5V, and recommends selecting a resistor value that ensures VOL ≤ 0.4V while sinking 100µA - typically 10kΩ to 100kΩ depending on bus capacitance and speed requirements. Without this resistor, the output cannot drive high and system reset logic will fail.

Can the MAX6375UR23+ operate reliably at VCC = 1.2V, and what is its output behavior below that?

Yes, the MAX6375UR23+ is fully specified and guaranteed to assert correct output logic (OUT low when VCC < 2.32V) down to VCC = 1.2V. Below 1.2V, the device remains functional but is not characterized - however, the datasheet explicitly states all parts maintain correct output state "for VCC down to 1V", meaning OUT stays asserted (low) through deep brownout, providing failsafe reset hold until power is fully removed. This behavior is critical for orderly MCU shutdown sequences.

How does the MAX6375UR23+ reject power supply transients, and what is its maximum tolerable glitch duration?

The MAX6375UR23+ incorporates internal filtering to ignore fast negative-going VCC transients. Its Typical Operating Characteristics graph "Maximum Transient Duration vs. Threshold Overdrive" shows it tolerates a 100mV overdrive (i.e., VCC dropping to 2.22V) for up to ~200µs without generating an output pulse. At larger overdrives (e.g., 200mV), the allowable duration shrinks to ~50µs. This hard-coded immunity prevents false resets caused by switching noise or load dumps - a key differentiator versus basic comparators.

Is the MAX6375UR23+ pin-compatible with other members of the MAX6375–MAX6380 family, such as the MAX6375UR22+ or MAX6375UR24+?

Yes, all MAX6375URxx+ variants share identical SOT23-3 pinout (GND, OUT, VCC), same footprint, and identical electrical interface - only the factory-trimmed threshold voltage differs (2.20V, 2.32V, 2.40V, etc.). No PCB changes are required when substituting between these parts; the change affects only the trip point. This interchangeability simplifies design reuse and inventory management across multiple voltage-monitoring requirements within the same product family.