Analog Devices Inc. ADM811TART-REEL7

Overview

ADM811TART-REEL7 from Analog Devices is a microprocessor supervisory circuit in 4-lead SOT-143 package, providing active-low reset assertion at 3.08 V threshold with ±5% tolerance over −40°C to +85°C, 140 ms minimum power-on reset timeout, and 5 µA typical supply current. It monitors 3.3 V supply rails in embedded controllers and safety-critical instrumentation.

For engineers reviewing the ADM811TART-REEL7 datasheet, ADM811TART-REEL7 pinout, ADM811TART-REEL7 application, or ADM811TART-REEL7 equivalent, key selection criteria include reset threshold accuracy (3.08 V), guaranteed reset assertion down to VCC = 1 V, manual reset debounce (10 µs min pulse width), and SOT-143 thermal performance (θJA = 330°C/W).

Technical Context

The ADM811TART-REEL7 implements a precision bandgap voltage reference with 30 ppm/°C temperature coefficient to maintain reset threshold stability across industrial temperature range. Its internal reset generator holds RESET low for ≥140 ms after VCC rises above 3.08 V, ensuring reliable microprocessor initialization.

It features a debounced manual reset input (MR) that rejects glitches <100 ns and responds to pulses ≥10 µs, with logic-level thresholds scaling to 0.7 × VCC (rising) and 0.25 × VCC (falling) for robust noise immunity in automotive and portable systems.

Key Specifications

Pinout & Package

Package: 4-lead SOT-143 (RA-4), JEDEC-compliant, 1.40 mm × 2.90 mm footprint, 0.95 mm height, 330°C/W thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX811TUR+T and TPS3808G30DBVR, ADM811TART-REEL7 uniquely combines 3.08 V precision threshold, sub-1.2 V reset validity, integrated debounced MR, and 5 µA typical current in a single SOT-143 device-enabling simpler, more robust supervision for safety-critical 3.3 V systems.

Availability

ADM811TART-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitors, and railway signaling interface units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM811TART-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, Inc. 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 product line delivers highly accurate, low-power microprocessor supervisory circuits optimized for industrial, automotive, and medical systems where deterministic reset behavior under voltage fault conditions is mandatory.

FAQ

What is the exact reset threshold voltage of the ADM811TART-REEL7 and its tolerance over temperature?

The ADM811TART-REEL7 has a nominal reset threshold of 3.08 V, with a guaranteed range of 3.00 V to 3.15 V over the full −40°C to +85°C operating temperature range. This ±5% tolerance is specified in Table 1 of the Rev. H datasheet and applies directly to the ADM811TART-REEL7 variant, enabling precise supervision of 3.3 V supply rails without external calibration.

Does the ADM811TART-REEL7 provide reset assertion during power-down, and down to what VCC level?

Yes, the ADM811TART-REEL7 asserts RESET low during power-down and maintains a valid logic-low state down to VCC = 1.2 V (minimum) across the full temperature range. This behavior is confirmed in the Absolute Maximum Ratings table and General Description section, ensuring the connected microprocessor remains held in reset during uncontrolled supply collapse.

What is the function and electrical specification of the MR pin on the ADM811TART-REEL7?

The MR pin on the ADM811TART-REEL7 is an active-low, debounced manual reset input. It requires a minimum pulse width of 10 µs to trigger reset, rejects transients shorter than 100 ns, and accepts logic thresholds of 0.7 × VCC (rising edge) and 0.25 × VCC (falling edge) - specifications explicitly defined for ADM811T/ADM812T variants in Table 1 and Pin Function Descriptions.

Is the ADM811TART-REEL7 compatible with 3.3 V and 5 V systems, and how does its output interface work?

Yes, the ADM811TART-REEL7 supports VCC from 1.2 V to 5.5 V and features an open-drain RESET output. When asserted, it sinks current to GND; when inactive, it presents high impedance - allowing external pull-up to any voltage ≤5.5 V, including 3.3 V or 5 V domains, as confirmed in the Output section on Page 9 of the datasheet.

What package type and lead count does the ADM811TART-REEL7 use, and are its dimensions standardized?

The ADM811TART-REEL7 uses a 4-lead SOT-143 package (JEDEC TO-253-AA, Analog Devices RA-4), with standardized dimensions of 1.40 mm × 2.90 mm × 0.95 mm. Outline dimensions are fully documented in Figure 12 on Page 10 of the Rev. H datasheet, ensuring compatibility with automated assembly and IPC-7351 land patterns.