Analog Devices Inc./Maxim Integrated MAX6380UR34-T

Overview

MAX6380UR34-T 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 3.40V 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 MAX6380UR34-T datasheet, MAX6380UR34-T pinout, MAX6380UR34-T application, or MAX6380UR34-T equivalent, key selection factors include its 3.40V trip point, open-drain output configuration, SC70/SOT23-3 package compatibility, transient immunity up to 100µs at 200mV overdrive, and guaranteed logic state retention down to 1V supply.

Technical Context

The MAX6380UR34-T implements a precision bandgap reference and comparator with internally trimmed resistors to set its 3.40V detection threshold. Its open-drain output requires an external pull-up and sinks current only when asserted (VCC < VTH), enabling flexible interfacing across logic voltage domains up to 5.5V.

It ignores fast negative-going VCC transients - maximum tolerable glitch duration is 100µs at 200mV overdrive (VTH − VCC), decreasing as overdrive increases. The device guarantees correct output logic state for VCC ≥1V and exhibits ±2.5% threshold accuracy from −40°C to +85°C.

Key Specifications

Pinout & Package

MAX6380UR34-T is packaged in a 3-pin SOT23-3 (lead-free, tape-and-reel). Pin 1 = GND, Pin 2 = OUT (open-drain), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EC33DBZR and TPS3808G33DBVR, the MAX6380UR34-T offers optimal balance of ultra-low ICC (500nA), true open-drain output in minimal 3-pin SOT23, and tight 3.40V threshold - making it ideal for space-constrained, long-life battery systems where reset line voltage translation is needed.

Availability

MAX6380UR34-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and wearable fitness trackers requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for MAX6380UR34-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 high-performance analog and mixed-signal semiconductors for power, sensing, and interface applications.

The MAX6375–MAX6380 family delivers ultra-low-power, factory-trimmed voltage detectors for battery and power-rail monitoring in space- and energy-constrained systems.

FAQ

What is the exact reset threshold voltage of the MAX6380UR34-T?

The MAX6380UR34-T has a factory-trimmed nominal reset threshold of 3.40V, with ±2.5% accuracy over the full operating temperature range (−40°C to +85°C). This value is confirmed in Table 1 of the datasheet under suffix "R34", and applies specifically to the MAX6380 series (3.30V–4.63V range). The MAX6380UR34-T maintains this specification in both SOT23-3 and SC70 packages.

Does the MAX6380UR34-T require an external pull-up resistor on the OUT pin?

Yes, the MAX6380UR34-T features an open-drain active-low output, so an external pull-up resistor is mandatory to establish a defined HIGH state when the output is not asserted. The datasheet recommends selecting a resistor value that ensures valid logic HIGH while supplying all connected input leakage and load currents, with pull-up voltage up to 5.5V allowed. No pull-up is needed for push-pull variants like MAX6379.

What is the minimum VCC voltage at which the MAX6380UR34-T guarantees correct output logic state?

The MAX6380UR34-T guarantees correct output logic state (i.e., OUT remains low when VCC < VTH and high when VCC > VTH) for VCC down to 1.0V. This is explicitly stated in the General Description and Electrical Characteristics sections, enabling reliable operation during deep brownout conditions where other detectors may fail.

How does the MAX6380UR34-T handle fast supply transients?

The MAX6380UR34-T is designed to ignore fast negative-going VCC transients. Its propagation delay and internal filtering allow rejection of glitches up to 100µs wide when VTH − VCC = 200mV, with maximum tolerable duration decreasing as overdrive increases. This prevents false resets in electrically noisy environments such as motor-driven or RF-intensive systems.

Is the MAX6380UR34-T available in lead-free packaging?

Yes, the MAX6380UR34-T is available in lead-free packaging. To order the lead-free version, replace the "-T" suffix with "+T" per Maxim's ordering convention (e.g., MAX6380UR34+T). Both versions are offered in tape-and-reel format only, and the SOT23-3 package meets RoHS requirements when ordered with the +T suffix.