Analog Devices Inc. ADM811ZARTZ-REEL7

Overview

ADM811ZARTZ-REEL7 from Analog Devices is a precision microprocessor supervisory circuit in 4-lead SOT-143 (RA-4) package, providing active-low reset assertion for systems powered by 2.5 V supplies. It monitors VCC down to 1.0 V, asserts RESET for ≥140 ms after power-up, features 2.32 V reset threshold (±2.5% over −40°C to +85°C), consumes only 5 µA typical supply current, and includes debounced manual reset input. It is used in portable instruments and safety-critical embedded controllers requiring reliable brownout detection.

For engineers reviewing the ADM811ZARTZ-REEL7 datasheet, ADM811ZARTZ-REEL7 pinout, ADM811ZARTZ-REEL7 application, or ADM811ZARTZ-REEL7 equivalent, key selection criteria include reset threshold accuracy at 2.32 V, guaranteed 140 ms minimum timeout, low-power operation below 10 µA, compatibility with 2.5 V supply rails, and SOT-143 footprint constraints for space-constrained PCBs.

Technical Context

The ADM811ZARTZ-REEL7 implements a precision bandgap voltage reference and comparator-based reset generator with internal timing capacitor. Its reset threshold is trimmed to 2.32 V (typical) with ±2.5% tolerance across −40°C to +85°C and 30 ppm/°C temperature coefficient.

It delivers active-low RESET output that remains valid down to VCC = 1.0 V, supports manual reset via debounced MR input (10 µs minimum pulse width, 100 ns glitch immunity), and guarantees propagation delay ≤0.5 µs from MR or VCC fault to RESET assertion.

Key Specifications

Pinout & Package

ADM811ZARTZ-REEL7 is housed in a JEDEC-compliant 4-lead SOT-143 (RA-4) package, 2.90 mm × 1.40 mm × 1.07 mm, with gull-wing leads and RoHS-compliant finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX811ZTR and TPS3808G12DBVR, ADM811ZARTZ-REEL7 uniquely combines guaranteed 1 VCC reset assertion, integrated debounced MR, and 5 µA typical current in a 4-pin SOT-143 - enabling simpler, safer, and more compact 2.5 V system supervision without external components.

Availability

ADM811ZARTZ-REEL7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, railway signaling interface cards, and safety-critical embedded controllers requiring stable component supply across extended temperature ranges.

Supply support for ADM811ZARTZ-REEL7 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADM811/ADM812 family was designed specifically for reliable voltage monitoring in microprocessor-based systems where precise, low-power, and temperature-stable reset generation is critical for functional safety and data integrity.

FAQ

What is the exact reset threshold voltage of ADM811ZARTZ-REEL7 and how does it vary with temperature?

The ADM811ZARTZ-REEL7 has a nominal reset threshold of 2.32 V at 25°C, with guaranteed limits of 2.25 V (minimum) to 2.38 V (maximum) over the full −40°C to +85°C operating range. Its temperature coefficient is specified at 30 ppm/°C, meaning threshold drift is tightly controlled and predictable across industrial temperatures - critical for consistent brownout detection in 2.5 V systems.

Does ADM811ZARTZ-REEL7 support manual reset, and what are the electrical requirements for the MR pin?

Yes, ADM811ZARTZ-REEL7 includes a debounced manual reset (MR) input. The MR pin is active-low and requires a minimum pulse width of 10 µs to trigger reset. It ignores glitches shorter than 100 ns and accepts logic-low transitions referenced to 0.25 × VCC or rising edges above 0.7 × VCC. No external RC filter is needed due to built-in debounce, simplifying interface to pushbuttons or digital control signals.

What is the minimum VCC level at which ADM811ZARTZ-REEL7 continues to assert a valid RESET signal?

ADM811ZARTZ-REEL7 asserts a valid active-low RESET signal down to VCC = 1.0 V, as confirmed in the Absolute Maximum Ratings and General Description sections of the datasheet. This ensures the connected microprocessor remains held in reset during deep supply collapse - a key reliability feature distinguishing it from supervisors that release reset above 1.2 V.

What package type and lead finish does ADM811ZARTZ-REEL7 use, and is it RoHS compliant?

ADM811ZARTZ-REEL7 uses the 4-lead SOT-143 (JEDEC RA-4) package with gull-wing leads and is RoHS compliant. The "Z" suffix in the part number explicitly denotes RoHS compliance per Analog Devices' ordering guide, and the device is supplied on 3,000-piece tape-and-reel (REEL7). Lead finish is matte tin, compatible with standard Pb-free reflow profiles.

How does the reset timeout period of ADM811ZARTZ-REEL7 behave across temperature and supply voltage?

The ADM811ZARTZ-REEL7 guarantees a minimum reset timeout of 140 ms after VCC rises above the threshold, with maximum timeout up to 560 ms depending on VCC and temperature. Figure 6 in the datasheet shows this variation is monotonic and bounded - ensuring all microcontrollers receive sufficient reset hold time regardless of ambient conditions or supply ramp rate, meeting JEDEC JESD78 requirements.