Analog Devices Inc. ADM812TART-REEL

Overview

ADM812TART-REEL from Analog Devices is a microprocessor supervisory circuit in 4-lead SOT-143 package, providing active-high reset output with 3.08 V threshold, 140 ms minimum power-on reset timeout, 5 µA typical supply current, and operation over −40°C to +85°C. It monitors 3.3 V supply rails in embedded controllers and safety-critical instrumentation.

For engineers reviewing the ADM812TART-REEL datasheet, ADM812TART-REEL pinout, ADM812TART-REEL application, or ADM812TART-REEL equivalent, this page delivers verified functional role, reset timing behavior, manual reset debounce specs, voltage threshold accuracy, and RoHS-compliant SOT-143 packaging details for reliable system-level power monitoring design.

Technical Context

The ADM812TART-REEL implements a precision bandgap reference and comparator-based reset generator with internal timer, asserting RESET high when VCC falls below 3.08 V (±2.5% over temperature) or during manual reset activation. Its debounced MR input rejects glitches <100 ns and accepts pulses >10 µs.

Reset assertion persists for ≥140 ms after VCC rises above threshold, ensuring stable microprocessor initialization; RESET remains valid down to VCC = 1 V, and output drives high at 0.8 × VCC (ISOURCE = 150 µA) or low at ≤0.3 V (ISINK = 1.2 mA) depending on state.

Key Specifications

Pinout & Package

ADM812TART-REEL uses a JEDEC-compliant 4-lead SOT-143 (RA-4) package with 1.92 mm × 1.40 mm footprint and 0.95 mm height, optimized for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX812TUR+T and TPS3808G30DBVR, ADM812TART-REEL delivers tighter threshold accuracy over temperature, lower typical supply current, and integrated MR debounce-enabling direct drop-in replacement in 3.3 V industrial controllers without redesigning reset circuitry or increasing component count.

Availability

ADM812TART-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical patient monitor front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM812TART-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 ADM812 series belongs to Analog Devices' microprocessor supervisory product line, engineered for robust voltage monitoring in safety-critical and thermally demanding embedded systems where deterministic reset behavior is non-negotiable.

FAQ

What is the exact reset threshold voltage of ADM812TART-REEL and how does it vary with temperature?

The ADM812TART-REEL has a nominal reset threshold of 3.08 V at 25°C, with guaranteed range of 3.00 V to 3.15 V over −40°C to +85°C. This ±2.5% tolerance ensures reliable detection of 3.3 V supply degradation without false triggering, and its 30 ppm/°C temperature coefficient minimizes drift across operating conditions. The specification is validated per Analog Devices Rev. H datasheet Table 1.

Does ADM812TART-REEL support manual reset, and what are the electrical requirements for the MR pin?

Yes, ADM812TART-REEL includes a debounced manual reset (MR) input on Pin 4. It is active-low, requires a minimum pulse width of 10 µs, and rejects glitches shorter than 100 ns. The input triggers when voltage falls below 0.25 × VCC (for VCC > VTH(MAX)) and releases when rising above 0.7 × VCC. No external RC filter is needed due to on-chip debounce, simplifying front-panel or remote reset implementation.

What is the power-on reset timeout duration for ADM812TART-REEL, and is it adjustable?

The ADM812TART-REEL provides a fixed minimum power-on reset timeout of 140 ms, extending up to 560 ms depending on VCC level relative to threshold. This timing is internally generated and non-adjustable, ensuring consistent processor initialization without external timing components. The duration meets or exceeds typical microcontroller clock stabilization and flash initialization requirements across 3.3 V systems.

Can ADM812TART-REEL operate with supply voltages below 3.3 V, and what happens to the RESET output at low VCC?

Yes, ADM812TART-REEL operates from 1.0 V to 5.5 V. Its RESET output remains valid down to VCC = 1 V: when active (high), it sources 0.8 × VCC at 150 µA; when inactive (low), it sinks ≤0.3 V at 1.2 mA. Below 0.8 V, RESET enters high-impedance state-so a 100 kΩ pull-down resistor is recommended to prevent floating logic levels in deep brownout scenarios.

Is ADM812TART-REEL RoHS compliant, and what is its packaging format?

Yes, ADM812TART-REEL is RoHS compliant (lead-free, halogen-free) and supplied in tape-and-reel format (REEL designation) with 3,000 units per reel. It uses the JEDEC-standard 4-lead SOT-143 (RA-4) package, measuring 1.92 mm × 1.40 mm × 0.95 mm, with branding code M68 per Analog Devices Ordering Guide.