Analog Devices Inc./Maxim Integrated MAX6377UR23+T

Overview

MAX6377UR23+T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector with a factory-trimmed threshold of 2.32V ±2.5%, 500nA supply current, and operation down to 1V VCC. It monitors battery or regulated supply voltage in portable systems and asserts OUT low when VCC falls below VTH, supporting precision power-fail detection in space-constrained SOT23-3 designs.

For engineers reviewing the MAX6377UR23+T datasheet, MAX6377UR23+T pinout, MAX6377UR23+T application, or MAX6377UR23+T equivalent, key selection factors include its 2.32V trip point, open-drain output compatibility with mixed-voltage logic, transient immunity up to 200µs at 100mV overdrive, and guaranteed output state down to 1V supply - critical for battery voltage supervision in wearables and IoT edge nodes.

Technical Context

The MAX6377UR23+T implements a precision bandgap reference and comparator with internally trimmed resistors to set its 2.32V threshold, eliminating external components. Its open-drain output requires an external pull-up and sinks 100µA at VOL ≤0.4V (VCC ≥1.2V), enabling interface flexibility across logic families.

Designed for immunity to fast VCC transients, it suppresses false triggers from glitches up to 200µs wide when VCC dips 100mV below VTH. The device operates continuously from -40°C to +85°C with ±2.5% threshold accuracy and 40ppm/°C tempco, ensuring stable reset behavior across temperature in battery-powered applications.

Key Specifications

Pinout & Package

MAX6377UR23+T 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 supervisor applications.

Compared with TLV803EB23DBZR and APX803S-23SA-7, the MAX6377UR23+T offers superior transient immunity (200µs vs. 100µs typical) and tighter tempco (40ppm/°C vs. 60–80ppm/°C), making it preferred for high-reliability portable medical and industrial edge devices where supply noise is uncontrolled.

Availability

MAX6377UR23+T is available at Aetrix Electronics and suitable for wearable health monitors, industrial sensor nodes, smart home door locks, and portable medical infusion pumps requiring stable component supply and long-term production continuity.

Supply support for MAX6377UR23+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 connectivity in demanding industrial, medical, and consumer applications.

The MAX6375–MAX6380 family delivers ultra-low-power voltage supervision for battery-critical systems, with factory-trimmed thresholds and open-drain/push-pull variants optimized for portable equipment and space-constrained embedded designs.

FAQ

What is the exact factory-trimmed threshold voltage of MAX6377UR23+T?

The MAX6377UR23+T has a nominal threshold voltage of 2.32V, with ±2.5% tolerance over the full -40°C to +85°C temperature range. This value is laser-trimmed at wafer test and confirmed in Table 1 of the datasheet under suffix "R23". The device guarantees correct output state down to 1V VCC, making it suitable for deep-discharge battery monitoring where precise low-voltage detection is essential.

Does MAX6377UR23+T require external components for basic operation?

No, the MAX6377UR23+T requires no external components for core voltage detection functionality. Its precision bandgap reference, comparator, and threshold-setting resistors are fully integrated. Only an external pull-up resistor on the open-drain OUT pin is needed to establish logic-high level - typically 10kΩ to 3.3V or 5V - enabling direct interface with diverse logic families without additional passive components.

What is the maximum negative-going VCC transient duration that MAX6377UR23+T can ignore?

The MAX6377UR23+T suppresses output assertion for negative-going VCC transients up to 200µs when the overdrive (VTH – VCC) is 100mV, as shown in Figure 4 of the datasheet. This immunity increases as overdrive decreases and decreases as overdrive increases - for example, at 200mV overdrive, the maximum tolerable glitch duration drops to ~50µs. This ensures robust operation in electrically noisy environments like motor-driven or RF-intensive systems.

Can MAX6377UR23+T operate with a 1.5V supply?

Yes, the MAX6377UR23+T is fully functional down to 1.2V VCC and guarantees correct output logic state (active-low when VCC < VTH) down to 1V. At 1.5V, it draws only ~0.6µA supply current and maintains ±2.5% threshold accuracy. This makes the MAX6377UR23+T ideal for supervising single-cell NiMH or emerging low-voltage Li-ion chemistries where traditional supervisors fail to operate reliably.

What package type and lead finish does MAX6377UR23+T use?

The MAX6377UR23+T uses a 3-pin SOT23-3 package (JEDEC MO-178AA) with lead-free (RoHS-compliant) finish, indicated by the "+T" suffix. It is supplied in tape-and-reel format only, with standard reel size of 3000 units. The package is footprint-compatible with SC70-3 but offers higher thermal dissipation (320mW at +70°C vs. 174mW for SC70), supporting denser PCB layouts without derating concerns.