Analog Devices Inc./Maxim Integrated MAX6375UR31+T

Overview

MAX6375UR31+T from Maxim Integrated is an ultra-low-power, active-low voltage detector IC designed for precision supply monitoring in battery-powered systems. It features a factory-trimmed 3.08V threshold (±2.5% over temperature), 500nA supply current, push-pull output, and operates down to 1V VCC - enabling reliable brownout detection in portable medical devices, wearables, and low-power IoT sensors.

For engineers reviewing the MAX6375UR31+T datasheet, MAX6375UR31+T pinout, MAX6375UR31+T application, or MAX6375UR31+T equivalent, key selection criteria include its 3.08V trip point, SOT23-3 package compatibility, immunity to sub-20µs VCC transients, and guaranteed logic state retention down to 1V supply - critical for energy-harvesting and coin-cell applications.

Technical Context

The MAX6375UR31+T implements a precision bandgap reference and comparator with internally trimmed resistors to set its 3.08V detection threshold. Its push-pull output asserts low when VCC falls below VTH and remains valid down to 1V supply, eliminating need for external supervision circuitry.

It delivers 20µs propagation delay (falling edge) at +25°C and exhibits ±2.5% threshold accuracy across –40°C to +85°C. The device ignores fast negative-going VCC transients up to 200µs (at 10mV overdrive), ensuring robust operation in noisy power environments.

Key Specifications

Pinout & Package

MAX6375UR31+T is housed in a lead-free 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.9mm pitch and exposed pad not present. Pin 1 = GND, Pin 2 = OUT, Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB31DBZR and APX803S-31SA-7, the MAX6375UR31+T uniquely balances ultra-low 500nA current with push-pull simplicity and guaranteed 1V operation - making it optimal for space-constrained, battery-critical systems where both longevity and design efficiency matter.

Availability

MAX6375UR31+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and wearable fitness trackers requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for MAX6375UR31+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 - with emphasis on reliability and integration for demanding industrial and portable systems.

The MAX6375–MAX6380 family was engineered specifically for ultra-low-power supply monitoring in battery-operated equipment, delivering factory-trimmed thresholds and nanoscale current consumption without external components.

FAQ

What is the exact reset threshold voltage of the MAX6375UR31+T?

The MAX6375UR31+T has a factory-trimmed nominal reset threshold voltage of 3.08V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +85°C. This value is confirmed in Table 1 of the official datasheet and corresponds to the "R31" suffix in the part number. The MAX6375UR31+T maintains this specification without requiring external calibration or trimming components.

Does the MAX6375UR31+T require an external pull-up resistor on its output?

No, the MAX6375UR31+T does not require an external pull-up resistor because it features an active-low push-pull output. When VCC falls below 3.08V, the OUT pin actively drives low (≤0.4V at 100µA sink current); when VCC is above threshold, OUT is actively driven high (≥0.8×VCC). This eliminates the need for external components and simplifies interface to microcontroller RESET inputs.

What is the minimum supply voltage at which the MAX6375UR31+T guarantees correct output logic state?

The MAX6375UR31+T guarantees correct output logic state - i.e., OUT remains low when VCC < 3.08V and high when VCC > 3.08V - down to a minimum VCC of 1V. This is explicitly stated in the General Description and Electrical Characteristics sections of the datasheet, enabling reliable operation during deep brownout conditions where other detectors fail.

How does the MAX6375UR31+T handle short voltage transients on the VCC line?

The MAX6375UR31+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 pulses up to ~20µs wide when the overdrive (VTH – VCC) is 100mV, and up to ~5µs at 200mV overdrive. This immunity prevents false resets caused by switching regulator noise or load-step disturbances.

Is the MAX6375UR31+T available in both leaded and lead-free packaging?

Yes, the MAX6375UR31+T is available in lead-free packaging, indicated by the "+T" suffix in the part number. Maxim specifies that lead-free versions replace "-T" with "+T" in ordering - confirming RoHS compliance and compatibility with modern reflow profiles. The SOT23-3 package meets JEDEC standards and supports standard automated assembly processes.