Analog Devices Inc. ADM811-3TARTZ-RL

Overview

ADM811-3TARTZ-RL from Analog Devices is a microprocessor supervisory circuit in 4-lead SOT-143 package, providing active-low reset assertion for 3.08 V supply monitoring, 140 ms minimum power-on reset timeout, 5 µA typical supply current, and debounced manual reset input - used to ensure reliable boot sequencing in embedded controllers and safety-critical instrumentation.

For engineers reviewing the ADM811-3TARTZ-RL datasheet, ADM811-3TARTZ-RL pinout, ADM811-3TARTZ-RL application, or ADM811-3TARTZ-RL equivalent, this page delivers verified functional identity, temperature-stable reset threshold (3.08 V ±0.15 V over −40°C to +85°C), glitch-immune MR interface, valid RESET output down to VCC = 1 V, and RoHS-compliant SOT-143 packaging for industrial-grade reliability.

Technical Context

The ADM811-3TARTZ-RL implements a precision bandgap voltage reference with 30 ppm/°C temperature coefficient to generate a stable 3.08 V reset threshold. Its internal reset generator holds RESET low for ≥140 ms after VCC rises above threshold, extending to ≥300 ms for the -3T variant per datasheet Table 1.

It features a fully debounced manual reset input (MR) rejecting <100 ns glitches and requiring >10 µs pulses, with logic-level detection thresholds scaling to 0.7 × VCC (rising) and 0.25 × VCC (falling) - enabling robust operation across varying supply conditions without external conditioning.

Key Specifications

Pinout & Package

ADM811-3TARTZ-RL 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 exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX811TUR+T and TPS3808G30DBVR, ADM811-3TARTZ-RL delivers guaranteed 300–700 ms reset hold time in a compact 4-pin SOT-143, enabling robust cold-start sequencing without external components - critical for space-constrained industrial controllers where predictable timing and minimal BOM are design priorities.

Availability

ADM811-3TARTZ-RL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitors, and smart energy meters requiring stable component supply with guaranteed long-term manufacturability.

Supply support for ADM811-3TARTZ-RL 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 company 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 microprocessor supervision in harsh industrial and automotive environments - delivering accurate, low-power, and glitch-immune reset generation without external components.

FAQ

What is the exact reset threshold voltage of ADM811-3TARTZ-RL and how does it vary with temperature?

The ADM811-3TARTZ-RL has a nominal reset threshold of 3.08 V, with a guaranteed range of 3.00 V to 3.15 V over the full operating temperature range of −40°C to +85°C. This specification is confirmed in Table 1 and Table 4 of the Rev. H datasheet. The device achieves this stability using a precision bandgap reference with a temperature coefficient of 30 ppm/°C, ensuring minimal drift across thermal extremes encountered in industrial deployments.

Does ADM811-3TARTZ-RL support manual reset, and what are the electrical requirements for the MR pin?

Yes, ADM811-3TARTZ-RL includes a debounced manual reset (MR) input. The MR pin is active-low and accepts pulses longer than 10 µs while rejecting transients shorter than 100 ns. Its logic thresholds scale with VCC: rising-edge detection occurs above 0.7 × VCC, and falling-edge detection occurs below 0.25 × VCC - allowing reliable operation across varying supply levels without external level-shifting circuitry.

What is the power-on reset timeout duration for ADM811-3TARTZ-RL, and why is it longer than standard ADM811 variants?

The ADM811-3TARTZ-RL provides a power-on reset timeout of 300–700 ms, significantly longer than the base 140–560 ms range of standard ADM811 models. This extended duration is explicitly designated by the "-3T" suffix and is documented in Table 1 under "RESET ACTIVE TIMEOUT PERIOD" for "ADM811-3T only". It ensures adequate stabilization time for complex microcontrollers and peripheral ICs in demanding industrial applications.

Is ADM811-3TARTZ-RL RoHS-compliant, and what does the "Z" suffix indicate?

Yes, ADM811-3TARTZ-RL is RoHS-compliant. The "Z" suffix in the part number explicitly denotes conformance to EU RoHS Directive 2011/65/EU, including lead-free terminations and halogen-free packaging. This is confirmed in the Ordering Guide on page 10 of the Rev. H datasheet, where "Z = RoHS Compliant Part" is formally defined.

Can ADM811-3TARTZ-RL maintain a valid RESET output when VCC falls below 2 V, and what design consideration applies?

Yes, ADM811-3TARTZ-RL guarantees valid RESET output down to VCC = 1.0 V, as specified in the Absolute Maximum Ratings and General Description sections. However, when VCC drops below 0.8 V, the RESET output no longer sinks current reliably. To prevent floating logic states, a 100 kΩ pull-down resistor from RESET to GND is recommended - a design practice illustrated in Figure 11 of the datasheet to ensure deterministic low-level assertion during deep brownout.