Analog Devices Inc./Maxim Integrated MAX6380UR37

Overview

MAX6380UR37 from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector designed for precision power-supply monitoring in battery-powered systems. It features a factory-trimmed 3.700V threshold (±2.5% over temperature), 500nA supply current at +25°C, and guaranteed operation down to VCC = 1V. It asserts OUT low when VCC falls below VTH and is used in portable equipment reset supervision and load-switch control.

For engineers reviewing the MAX6380UR37 datasheet, MAX6380UR37 pinout, MAX6380UR37 application, or MAX6380UR37 equivalent, key selection criteria include its 3.70V trip point, SOT23-3 open-drain output configuration, ±2.5% threshold accuracy across -40°C to +85°C, immunity to sub-100µs VCC transients, and compatibility with 1.2V–5.5V supply rails.

Technical Context

The MAX6380UR37 implements a precision bandgap reference and comparator with internally trimmed resistors to set its 3.700V detection threshold. Its open-drain output requires an external pull-up and sinks ≥100µA when asserted, supporting interface with diverse logic families up to 5.5V.

It ignores fast negative-going VCC transients - maximum allowable glitch duration is ≤120µs at 100mV overdrive (VTH − VCC = 100mV) - and maintains correct output state down to 1V supply, enabling reliable brownout detection in deep-sleep microcontroller systems.

Key Specifications

Pinout & Package

MAX6380UR37 is housed in a 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 combines guaranteed 1V operation, documented 120µs transient immunity at 100mV overdrive, and ±2.5% accuracy - making it the preferred choice for robust brownout detection in battery-critical and EMI-prone designs.

Availability

MAX6380UR37 is available at Aetrix Electronics and suitable for portable medical sensors, industrial I/O modules, smart home safety devices, and asset tracking beacons requiring stable component supply and long-term manufacturability.

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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.

The MAX6375–MAX6380 family was designed specifically for ultra-low-power voltage monitoring in space-constrained, battery-operated systems - delivering precision reset functionality without external components or trimming.

FAQ

What is the exact reset threshold voltage of the MAX6380UR37?

The MAX6380UR37 has a factory-trimmed nominal reset threshold of 3.700V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +85°C. At +25°C, the typical threshold is 3.700V, and the min/max limits are 3.607V and 3.792V respectively - confirmed in Table 1 of the official datasheet.

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

Yes, the MAX6380UR37 features an open-drain active-low output, so an external pull-up resistor is mandatory for proper logic-level assertion. The resistor connects between OUT and any supply rail up to 5.5V. Typical values range from 10kΩ to 100kΩ, selected to ensure VOL ≤0.4V at ISINK = 100µA while minimizing standby current.

Can the MAX6380UR37 operate reliably below 1.2V supply voltage?

No - the absolute minimum specified VCC for functional operation is 1.2V. Although the device guarantees correct output logic state down to 1V, electrical characteristics including propagation delay, threshold accuracy, and output drive are only guaranteed within the 1.2V to 5.5V operating range per the datasheet's Electrical Characteristics table.

What package type is used for the MAX6380UR37, and is it RoHS-compliant?

The MAX6380UR37 is supplied in a 3-pin SOT23-3 package (JEDEC MO-178AA). It is available in both leaded and lead-free versions; the standard -T suffix denotes leaded packaging, while replacing -T with +T specifies RoHS-compliant lead-free construction - explicitly confirmed in the Ordering Information section.

How does the MAX6380UR37 handle short voltage transients on the VCC line?

The MAX6380UR37 rejects fast negative-going VCC transients up to 120µs in duration when the overdrive (VTH − VCC) is 100mV, as shown in Figure MAX6375-04. This built-in immunity prevents false resets during switching regulator noise, hot-plug events, or ESD-induced supply dips - a key differentiator versus basic comparators without transient filtering.