Analog Devices Inc. ADM811ZART-REEL

Overview

ADM811ZART-REEL from Analog Devices is a precision microprocessor supervisory circuit in SOT-143 package, providing active-low reset assertion at 2.32 V threshold with ±0.07 V tolerance over −40°C to +85°C, 140 ms minimum reset timeout, 5 µA typical supply current, and debounced manual reset input - used for reliable power-on and brownout reset in low-voltage embedded controllers.

For engineers reviewing the ADM811ZART-REEL datasheet, ADM811ZART-REEL pinout, ADM811ZART-REEL application, or ADM811ZART-REEL equivalent, this page delivers verified functional identity, exact reset threshold behavior, manual reset timing specs, SOT-143 terminal mapping, and validated alternative options for 2.3 V supply monitoring designs.

Technical Context

The ADM811ZART-REEL implements a bandgap-referenced voltage comparator with internal hysteresis and a precision timer to generate a guaranteed minimum 140 ms active-low RESET pulse after VCC rises above 2.32 V. It asserts reset down to VCC = 1.0 V and maintains valid logic state during power fall.

Its manual reset (MR) input features 10 µs minimum pulse width acceptance and 100 ns glitch immunity, with threshold defined as 0.7 × VCC (rising) and 0.25 × VCC (falling), enabling robust operation in noisy environments without external filtering.

Key Specifications

Pinout & Package

ADM811ZART-REEL is housed in a JEDEC-compliant 4-lead SOT-143 (RA-4) package, 2.90 mm × 1.40 mm × 0.90 mm, with gull-wing leads and exposed pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX811ZTR and TPS3808G125DBVR, ADM811ZART-REEL uniquely combines 2.32 V precision, 5 µA typical current, integrated debounced MR, and guaranteed reset validity down to 1.0 V - making it optimal for compact, battery-sensitive, and safety-critical 2.5 V microcontroller supervision where manual recovery and deep brownout resilience are mandatory.

Availability

ADM811ZART-REEL is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, portable medical sensor hubs, smart energy meter MCU subsystems, and battery-backed instrumentation requiring stable component supply across extended temperature ranges.

Supply support for ADM811ZART-REEL 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

Analog Devices is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The ADM811/ADM812 family was designed specifically for reliable, low-power microprocessor supervision in space- and power-constrained embedded systems operating across industrial and automotive temperature ranges.

FAQ

What is the exact reset threshold voltage of ADM811ZART-REEL and its tolerance over temperature?

The ADM811ZART-REEL has a nominal reset threshold of 2.32 V, with a guaranteed range of 2.25 V to 2.38 V over the full −40°C to +85°C operating temperature range. This specification is confirmed in Table 1 and Table 4 of the Rev. H datasheet, and applies specifically to the Z-suffix variant. The ADM811ZART-REEL uses an internal bandgap reference to achieve this precision without external components.

Does ADM811ZART-REEL support manual reset, and what are its timing requirements?

Yes, ADM811ZART-REEL includes a debounced manual reset (MR) input that accepts active-low pulses ≥10 µs wide and rejects glitches ≤100 ns. Its logic thresholds are defined as rising above 0.7 × VCC and falling below 0.25 × VCC, ensuring compatibility across varying supply levels. This functionality is intrinsic to the ADM811ZART-REEL and does not require external circuitry.

What is the minimum VCC level at which ADM811ZART-REEL guarantees valid RESET output?

The ADM811ZART-REEL guarantees valid active-low RESET output down to VCC = 1.0 V, as specified in the "SUPPLY" section of Table 1 and confirmed in the General Description. This ensures the microprocessor remains held in reset during deep brownout conditions - a key differentiator versus alternatives that lose output validity above 1.5 V.

What package type and footprint does ADM811ZART-REEL use, and is it RoHS compliant?

ADM811ZART-REEL uses the 4-lead SOT-143 (RA-4) package per JEDEC TO-253-AA standards, with dimensions 2.90 mm × 1.40 mm × 0.90 mm. The "Z" suffix explicitly denotes RoHS compliance, and the ordering guide confirms ADM811ZART-REEL is supplied in RoHS-compliant form with MBZ branding.

How does the reset timeout behavior of ADM811ZART-REEL differ from ADM811-3T variants?

ADM811ZART-REEL provides a minimum reset timeout of 140 ms after VCC rises above threshold, whereas ADM811-3T variants specify a longer 300 ms minimum. This difference is documented in Table 1 under "RESET ACTIVE TIMEOUT PERIOD" and reflects distinct internal timer configurations - ADM811ZART-REEL is optimized for faster-recovery 2.5 V systems, not extended stabilization.