Analog Devices Inc./Maxim Integrated MAX6380UR37+

Overview

MAX6380UR37+ from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector IC designed for precision power-supply monitoring in battery-powered systems. It features a factory-trimmed 3.70V threshold (±2.5% over temperature), 500nA supply current, and guaranteed operation down to 1V VCC - enabling reliable brownout detection in portable medical devices, wearables, and IoT edge nodes.

For engineers reviewing the MAX6380UR37+ datasheet, MAX6380UR37+ pinout, MAX6380UR37+ application, or MAX6380UR37+ equivalent, key selection criteria include its 3.70V trip point, open-drain output architecture with 100µA leakage, ±2.5% threshold accuracy, transient immunity up to 200µs at 100mV overdrive, and SOT23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX6380UR37+ implements a precision bandgap reference and comparator with internally trimmed resistors to set its 3.70V detection threshold. Its open-drain output requires an external pull-up and asserts low when VCC falls below VTH, remaining valid down to 1V supply.

It rejects fast negative-going VCC transients - maximum allowable glitch duration is 200µs at 100mV overdrive - and exhibits 40ppm/°C voltage threshold tempco. Propagation delay is 9.5µs (typical) for falling-edge detection under full temperature range.

Key Specifications

Pinout & Package

MAX6380UR37+ is housed in a lead-free 3-pin SOT23-3 package (JEDEC MO-178AA), footprint-compatible with SC70-3 but with higher power dissipation rating (320mW at +70°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB37DBZR and APX803S-37SA-7, the MAX6380UR37+ uniquely balances ultra-low 500nA supply current, open-drain flexibility for mixed-voltage systems, and proven transient immunity - making it optimal for long-life, multi-rail portable designs where both power efficiency and interface adaptability are critical.

Availability

MAX6380UR37+ is available at Aetrix Electronics and suitable for battery voltage monitoring, microcontroller reset supervision, and DC-DC enable control requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.

Supply support for MAX6380UR37+ 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 solutions for industrial, automotive, and communications markets.

The MAX6375–MAX6380 family was designed specifically for ultra-low-power voltage monitoring in portable and battery-critical systems - delivering precision thresholds, nanoscale current consumption, and robust transient rejection in minimal 3-pin packages.

FAQ

What is the exact factory-trimmed threshold voltage of the MAX6380UR37+?

The MAX6380UR37+ has a nominal threshold voltage of 3.70V, with ±2.5% accuracy over the full operating temperature range (-40°C to +85°C). This value is laser-trimmed at wafer test and confirmed per Table 1 in the datasheet, where suffix "37" explicitly denotes the 3.70V variant within the MAX6380 series. The MAX6380UR37+ maintains this specification without external calibration.

Does the MAX6380UR37+ require an external pull-up resistor on its OUT pin?

Yes, the MAX6380UR37+ features an open-drain output and requires an external pull-up resistor to a valid logic rail (up to 5.5V). Typical values range from 10kΩ to 100kΩ depending on rise-time requirements and bus loading. The MAX6380UR37+ itself sinks no current when inactive, so the pull-up defines the high-state voltage and current draw during assertion.

Can the MAX6380UR37+ operate reliably below 1.2V VCC?

No - while the MAX6380UR37+ guarantees correct output logic state down to 1V VCC, its specified operating range begins at 1.2V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 1.2V is outside guaranteed specifications and may result in undefined behavior or increased propagation delay; the 1V guarantee applies only to maintaining output state integrity during brownout, not functional operation.

What is the maximum transient duration the MAX6380UR37+ can ignore at 100mV overdrive?

At 100mV overdrive (i.e., VCC = VTH − 100mV = 3.60V), the MAX6380UR37+ ignores negative-going transients up to 200µs in duration, as shown in Figure MAX6375-04 of the datasheet. This immunity prevents false triggering from brief power dips common in switching regulator environments or shared-rail systems.

Is the MAX6380UR37+ pin-compatible with other devices in the MAX6375–MAX6380 family?

Yes - all MAX6375–MAX6380 variants, including the MAX6380UR37+, share identical 3-pin SOT23-3 pinouts (VCC, GND, OUT) and SC70-3 footprints. Pin compatibility extends across output types (push-pull vs. open-drain) and threshold voltages, allowing direct substitution within the same package type without PCB changes - provided system-level logic polarity and pull-up requirements are verified.