Analog Devices Inc./Maxim Integrated MAX6380UR42

Overview

MAX6380UR42 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 4.200V threshold (±2.5% over temperature), 500nA supply current, and operates reliably down to 1V VCC. It asserts OUT low when VCC falls below threshold and is used in portable equipment for reset generation and brownout detection.

For engineers reviewing the MAX6380UR42 datasheet, MAX6380UR42 pinout, MAX6380UR42 application, or MAX6380UR42 equivalent, key selection criteria include its 4.20V trip point, SOT23-3 open-drain output, -40°C to +85°C operating range, transient immunity, and compatibility with 1.2V–5.5V supply rails.

Technical Context

The MAX6380UR42 implements a precision bandgap reference and comparator with internally trimmed resistors to set its 4.200V detection threshold. Its open-drain output requires an external pullup and sinks up to 100µA at VCC ≥ 1.2V when asserted.

It ignores fast negative-going VCC transients-maximum allowable glitch duration is ≤100µs for 20mV overdrive-and guarantees correct logic state down to 1V VCC. Threshold hysteresis is 9.5mV, and tempco is 40ppm/°C.

Key Specifications

Pinout & Package

MAX6380UR42 is housed in a 3-pin SOT23-3 package (lead-free option available as MAX6380UR42+T), with 1.3mm × 0.8mm 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 supervisor applications.

Compared with TLV803EB42DBZR and TPS3808G33DBVR, the MAX6380UR42 uniquely combines 4.20V precision, open-drain flexibility, and sub-µA operation in a 3-pin SOT23-making it optimal for compact, battery-critical 4.2V Li-ion systems where pullup control and minimal current are mandatory.

Availability

MAX6380UR42 is available at Aetrix Electronics and suitable for portable medical monitors, battery-powered IoT sensor nodes, Li-ion protection circuits, and industrial handheld meters requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6380UR42 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 supervision in space- and energy-constrained portable electronics, emphasizing precision, reliability, and zero-component integration.

FAQ

What is the exact reset threshold voltage of the MAX6380UR42 and how accurate is it over temperature?

The MAX6380UR42 has a factory-trimmed nominal reset threshold of 4.200V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +85°C. This specification is confirmed in Table 1 of the datasheet, where suffix "R42" explicitly maps to 4.200V (min 4.095V, max 4.305V at temperature extremes). The MAX6380UR42 achieves this without external components due to on-chip laser trimming of internal resistors.

Does the MAX6380UR42 require an external pullup resistor, and if so, what value is recommended?

Yes, the MAX6380UR42 features an open-drain active-low output and requires an external pullup resistor. The datasheet recommends selecting a value large enough to ensure VOL ≤0.4V at ISINK = 100µA (for VCC ≥1.2V), yet small enough to drive connected inputs. A 10kΩ to 100kΩ resistor to a logic rail ≤5.5V is typical; exact value depends on bus capacitance and sink current requirements of the driven device.

Can the MAX6380UR42 operate reliably below 2.0V VCC, and what is its minimum functional supply voltage?

Yes, the MAX6380UR42 is guaranteed to assert its output correctly down to VCC = 1.0V, as stated in the General Description and Electrical Characteristics table. It remains fully functional-including threshold comparison and output assertion-for VCC as low as 1.2V (with specified performance), and maintains valid logic state even at 1.0V, making it suitable for deep brownout detection in low-voltage battery systems.

How does the MAX6380UR42 handle power-supply transients, and what is its maximum tolerable glitch duration?

The MAX6380UR42 is designed to ignore fast negative-going VCC transients. According to the Typical Operating Characteristics graph "Maximum Transient Duration vs. Threshold Overdrive", it suppresses output pulses for glitches ≤100µs when the overdrive (V_TH – V_CC) is 20mV. As overdrive increases, allowable duration decreases-e.g., ~20µs at 100mV overdrive-ensuring robustness against switching noise and supply coupling.

Is the MAX6380UR42 available in both leaded and lead-free packaging, and how is lead-free ordering indicated?

Yes, the MAX6380UR42 is offered in both leaded and lead-free versions. To order the lead-free variant, replace the standard "-T" suffix with "+T", resulting in part number MAX6380UR42+T. Both versions use the same SOT23-3 package outline and are supplied in tape-and-reel format only, with minimum order increments of 2500 pieces for standard versions like MAX6380UR42.