Analog Devices Inc. ADM811ZARTZ-REEL

Overview

ADM811ZARTZ-REEL from Analog Devices is a microprocessor supervisory circuit in 4-lead SOT-143 (RA-4) package, providing active-low reset output with 2.32 V reset threshold, 140 ms minimum power-on reset timeout, 5 µA typical supply current, and operation over −40°C to +85°C. It monitors 2.5 V supply rails in embedded controllers and safety-critical instrumentation.

For engineers reviewing the ADM811ZARTZ-REEL datasheet, ADM811ZARTZ-REEL pinout, ADM811ZARTZ-REEL application, or ADM811ZARTZ-REEL equivalent, key selection factors include precise 2.32 V threshold tolerance (±0.07 V over temperature), manual reset input with 10 µs minimum pulse width, glitch immunity up to 100 ns, valid RESET assertion down to VCC = 1 V, and RoHS-compliant SOT-143 packaging for space-constrained PCB layouts.

Technical Context

The ADM811ZARTZ-REEL implements a precision bandgap reference and comparator-based voltage monitor with internal debounced manual reset logic. Its reset generator holds RESET low for ≥140 ms after VCC rises above 2.32 V, ensuring stable microprocessor initialization.

It features temperature-compensated threshold tracking (30 ppm/°C), supports VCC as low as 1.0 V while maintaining valid RESET output, and provides glitch immunity on both VCC and MR inputs via integrated filtering-critical for automotive and industrial brownout resilience.

Key Specifications

Pinout & Package

ADM811ZARTZ-REEL uses a 4-lead SOT-143 (RA-4) surface-mount package per JEDEC TO-253-AA, with 1.92 mm × 1.40 mm footprint and 0.95 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX811ZTR and TPS3801K32DBVR, ADM811ZARTZ-REEL uniquely combines guaranteed 1 V VCC operation, integrated debounced MR, and 5 µA typical current in a RoHS-compliant SOT-143-making it optimal for safety-critical 2.5 V systems requiring deterministic reset behavior under worst-case supply collapse.

Availability

ADM811ZARTZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitors, and avionics data acquisition units requiring stable component supply with full lifecycle traceability.

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

The ADM811/ADM812 product line delivers precision voltage supervision for microprocessor-based systems, designed specifically for reliable reset generation in harsh environments where supply stability cannot be assumed.

FAQ

What is the exact reset threshold voltage of ADM811ZARTZ-REEL and its tolerance over temperature?

The ADM811ZARTZ-REEL has a nominal reset threshold of 2.32 V, with a guaranteed range of 2.25 V to 2.38 V across the full operating temperature range of −40°C to +85°C. This 0.13 V window reflects ±0.07 V deviation from nominal and is specified in Table 1 of the Rev. H datasheet under "ADM811Z/ADM812Z" row. The part achieves this using a trimmed bandgap reference with 30 ppm/°C temperature coefficient.

Does ADM811ZARTZ-REEL provide an active-high or active-low reset output?

ADM811ZARTZ-REEL provides an active-low reset output (RESET). As confirmed in the Pin Function Descriptions (Table 3, Page 6), Pin 2 is labeled "RESET (ADM811)" and defined as "Active Low Logic Output." This distinguishes it from the ADM812 variant, which provides active-high output. The output remains low while VCC is below threshold or MR is asserted, then stays low for ≥140 ms after VCC recovers.

Can ADM811ZARTZ-REEL operate reliably when the monitored supply drops below 2.0 V?

Yes-ADM811ZARTZ-REEL maintains a valid active-low RESET output down to VCC = 1.0 V, as explicitly stated in the General Description (Page 1) and Absolute Maximum Ratings (Page 5). This ensures the connected microprocessor remains held in reset during deep brownout events. Below 0.8 V, however, RESET becomes high-impedance and requires a 100 kΩ pull-down resistor to prevent floating logic states.

What is the minimum pulse width required on the MR pin to trigger a manual reset with ADM811ZARTZ-REEL?

The ADM811ZARTZ-REEL requires a minimum manual reset (MR) pulse width of 10 µs to guarantee recognition, as specified in Table 1 under "MANUAL RESET Minimum Pulse Width." The device also provides 100 ns glitch immunity, meaning pulses shorter than 100 ns are ignored-ensuring robustness against switch bounce or EMI. MR is active-low and debounced internally, eliminating need for external filtering.

Is ADM811ZARTZ-REEL RoHS-compliant and what does the 'Z' suffix indicate?

Yes, ADM811ZARTZ-REEL is RoHS-compliant. The final 'Z' in the part number (per Ordering Guide, Page 10) explicitly denotes RoHS compliance, confirming lead-free and halogen-free construction. The 'Z' appears twice-in the base part (ADM811ZART) and the packaging suffix (Z-REEL)-reinforcing full compliance. This meets IPC/JEDEC J-STD-020 reflow standards and is verified in the official Analog Devices ordering documentation.