Analog Devices Inc. ADM812SART-REEL7

Overview

ADM812SART-REEL7 from Analog Devices is a microprocessor supervisory circuit in 4-lead SOT-143 package, providing active-high reset output with 2.93 V threshold, 140 ms minimum power-on reset timeout, 5 µA typical supply current, and operation over −40°C to +85°C for reliable system initialization in embedded controllers and safety-critical instrumentation.

For engineers reviewing the ADM812SART-REEL7 datasheet, ADM812SART-REEL7 pinout, ADM812SART-REEL7 application, or ADM812SART-REEL7 equivalent, this page delivers verified functional role, exact reset threshold tolerance (±0.05 V at 25°C), manual reset debounce timing (10 µs min pulse width), glitch immunity (100 ns rejection), and thermal coefficient (30 ppm/°C) - all confirmed from Analog Devices Rev. H datasheet.

Technical Context

The ADM812SART-REEL7 implements a precision bandgap voltage reference with comparator-based monitoring of VCC against a fixed 2.93 V threshold, asserting active-high RESET for ≥140 ms after VCC exceeds VTH. Its internal timer ensures deterministic power-up sequencing independent of external RC components.

It features debounced manual reset (MR) input with 10 µs minimum pulse acceptance and 100 ns glitch rejection, plus guaranteed RESET validity down to VCC = 1 V. The output drives high (≥0.8 × VCC) with 150 µA source capability and low (≤0.3 V) with 1.2 mA sink capability under specified conditions.

Key Specifications

Pinout & Package

ADM812SART-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 0.95 mm pitch. Thermal resistance θJA = 330°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX812SUT+T and TPS3808G33DBVR, ADM812SART-REEL7 uniquely combines precise 2.93 V threshold, 4-pin SOT-143 compactness, integrated debounced MR, and 5 µA ultra-low current - making it optimal for cost-sensitive, size-constrained 3.3 V systems needing manual reset and minimal BOM count.

Availability

ADM812SART-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical monitors, and safety-critical sensor nodes requiring stable component supply with guaranteed long-term continuity.

Supply support for ADM812SART-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, headquartered in Norwood, MA, with design and manufacturing expertise spanning precision sensing, power management, and real-time control.

The ADM811/ADM812 family was engineered specifically for robust microprocessor supervision in harsh environments - delivering accurate voltage monitoring, low-power operation, and glitch-immune reset generation for mission-critical embedded systems.

FAQ

What is the exact reset threshold voltage of ADM812SART-REEL7 and its tolerance?

The ADM812SART-REEL7 has a nominal reset threshold of 2.93 V at 25°C, with a guaranteed range of 2.85 V to 3.00 V over −40°C to +85°C. This 5% tolerance ensures reliable detection of 3.3 V supply droop while avoiding false resets due to normal ripple or noise. The value is factory-trimmed and documented in Table 1 and Table 4 of the Rev. H datasheet.

Does ADM812SART-REEL7 support manual reset, and what are its timing requirements?

Yes, ADM812SART-REEL7 includes a debounced manual reset (MR) input that accepts active-low pulses ≥10 µs and rejects transients ≤100 ns. The MR pin triggers immediate RESET assertion regardless of VCC level, and the output remains high for ≥140 ms after MR returns high. This is confirmed in Pin Function Descriptions (Table 3) and Circuit Information sections of the datasheet.

What is the supply current consumption of ADM812SART-REEL7 across voltage and temperature?

ADM812SART-REEL7 draws 5 µA typical supply current when VCC < 3.6 V and IOUT = 0 mA, with maximum 10 µA over −40°C to +85°C. At 5.5 V, current rises to 15 µA max. These values are measured per Table 1 and validated in Figure 4 and Figure 7 of the Rev. H datasheet - critical for battery-operated portable instrument design.

Can ADM812SART-REEL7 operate with supply voltages below 3.3 V, and down to what level?

Yes, ADM812SART-REEL7 operates from 1.0 V to 5.5 V. Its reset output remains valid (high) down to VCC = 1 V, ensuring safe processor hold during brownout. Below 0.8 V, RESET becomes high-impedance - requiring an external 100 kΩ pull-down resistor per Figure 11. This behavior is explicitly defined in the General Description and Interfacing sections.

What package type and dimensions does ADM812SART-REEL7 use?

ADM812SART-REEL7 uses a 4-lead SOT-143 (RA-4) package per JEDEC TO-253-AA standard: 2.90 mm × 1.40 mm × 1.07 mm body, 0.95 mm lead pitch, gull-wing leads. Outline dimensions are fully specified in Figure 12 (Page 10) of the Rev. H datasheet, with thermal impedance θJA = 330°C/W.