The ADCMP671 is an ultralow-power dual-limit (window) voltage monitor from Analog Devices. Rather than comparing one input to one threshold, it watches a rail against both an undervoltage and an overvoltage limit at once and flags each condition on its own output - the function a system needs to know that a supply is "in range," not just "above" or "below." ADCMP671-1YUJZ-RL7 is the RoHS-compliant ("Z") 6-lead TSOT-23 version on tape and reel, with the "-1" hysteresis/polarity option.

Two things make it practical. First, the built-in 400 mV reference, accurate to ±0.275%, removes the need for an external reference: the designer sets the UV and OV trip points with a simple external resistor divider into the INH (undervoltage) and INL (overvoltage) inputs, and the internal reference and comparators do the rest, with about 7.8 mV of built-in hysteresis for clean, chatter-free transitions. Second, the two open-drain outputs - PWRGD (valid while the rail is inside the UV/OV window) and OV (overvoltage fault) - can be wire-OR'd with other open-drain signals and pulled up to any rail up to VDD, which is how supervisors interface to a reset line or a system controller.

Power is the headline: the ADCMP671 runs on just 16 µA over a 1.7 V to 5.5 V supply, so it can monitor a battery or rail continuously without being a meaningful drain itself. That, plus the small 6-lead TSOT-23 and the integrated reference, is exactly what a Li-Ion-powered or handheld design wants from a supervisor.

Note: Values are taken from the Analog Devices ADCMP671 datasheet. Confirm every parameter against the latest official documentation before committing a design.

ADCMP671-1YUJZ-RL7 is supplied in the 6-lead TSOT-23 (Thin Small Outline Transistor package, ADI outline UJ-6), a low-profile 1 mm surface-mount body. "Z" marks the RoHS-compliant lead-free finish and "RL7" the tape-and-reel packing; "1Y" denotes the hysteresis/polarity option. As a supervisor watching a rail, place the threshold-setting divider close to the INH/INL inputs and keep the open-drain pull-ups tied to the logic rail being protected. Package dimensions and pin-1 orientation are shown below.

📄 Full specifications are detailed in the official Analog Devices ADCMP671 datasheet.

The 6-lead TSOT-23 brings out the two monitor inputs, two open-drain outputs and the supply:

• Pin 1 - PWRGD: Power-good open-drain output; active (valid) while the rail is inside the UV/OV window.
• Pin 2 - GND: Ground.
• Pin 3 - INH: Undervoltage (UV) monitor input; tie to the top of an external resistor divider.
• Pin 4 - INL: Overvoltage (OV) monitor input; tie to the top of an external resistor divider.
• Pin 5 - VDD: Positive supply (1.7 V to 5.5 V); decouple close to the pin.
• Pin 6 - OV: Overvoltage fault open-drain output (active low).

Refer to the package drawing below for the physical pin numbering of the TSOT-23-6.

The parts below are related ADI comparators and monitors, available in our catalog. Only the ADCMP670 is the same UV/OV-monitor family; the others are general comparators with a different function. Verify type, outputs and pinout before substituting.

Selection Tips: Stay with the ADCMP671 for a dual UV/OV window monitor with an internal reference and 16 µA supply. The ADCMP670 is the direct sibling (same family, different hysteresis/polarity option). The ADCMP600/601 and ADCMP391/393 are general-purpose comparators - choose them when you need a plain voltage comparison or higher speed, not a windowed supply supervisor.

Analog Devices, Inc. (ADI), headquartered in Wilmington, Massachusetts, USA, is a global leader in high-performance analog, mixed-signal and RF semiconductors, including a broad portfolio of comparators and supply supervisors. The ADCMP671 sits in ADI's voltage-monitor line, where an integrated precision reference and ultralow supply current are combined for battery and portable supervisory functions.

ADI backs the ADCMP671 with full datasheet characterization and application guidance on divider design, threshold accuracy and open-drain interfacing - the details that determine whether a supervisor trips exactly where intended over temperature.