Analog Devices Inc. ADM812SARTZ-REEL

Overview

ADM812SARTZ-REEL 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. It monitors 3.3 V supply rails in embedded controllers and portable instruments requiring reliable brownout detection and manual reset capability.

For engineers reviewing the ADM812SARTZ-REEL datasheet, ADM812SARTZ-REEL pinout, ADM812SARTZ-REEL application, or ADM812SARTZ-REEL equivalent, this page delivers verified functional identity, precise reset threshold behavior, manual reset timing constraints, thermal stability data, and RoHS-compliant sourcing details for industrial and automotive-grade designs.

Technical Context

The ADM812SARTZ-REEL implements a precision bandgap voltage reference with 30 ppm/°C temperature coefficient and internal debounce logic for the MR input. Its reset generator asserts RESET high when VCC falls below 2.85 V (min) or rises above 3.00 V (max) across −40°C to +85°C, maintaining output validity down to VCC = 1 V.

It features glitch-immune power monitoring with 20 µs VCC-to-RESET delay at 125 mV overdrive and guarantees manual reset pulse acceptance ≥10 µs while rejecting transients <100 ns. The active-high RESET output sources 150 µA at 0.8 × VCC for 1.8 V < VCC < VTH(MIN).

Key Specifications

Pinout & Package

ADM812SARTZ-REEL uses a 4-lead SOT-143 (RA-4) package per JEDEC TO-253-AA, with 1.40 mm × 1.20 mm body size, 0.90 mm lead pitch, and gull-wing leads for surface-mount assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM812SARTZ-REEL, MAX812SUT+T offers pin-compatible SOT-23-4 layout but trades higher current and looser MR timing specs, while TPS3808G33DBVR achieves superior power efficiency at the cost of fixed threshold and added pin count - making ADM812SARTZ-REEL optimal for 2.93 V–specific, space-constrained, and thermally demanding applications.

Availability

ADM812SARTZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical monitors, smart energy meters, and battery-powered instrumentation requiring stable component supply with full RoHS compliance and extended temperature support.

Supply support for ADM812SARTZ-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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.

The ADM812SARTZ-REEL belongs to the ADM811/ADM812 family of microprocessor supervisory circuits designed specifically for robust voltage monitoring and reset generation in industrial, automotive, and portable electronics where reliability under voltage transients is critical.

FAQ

What is the exact reset threshold voltage of ADM812SARTZ-REEL and how does it vary with temperature?

The ADM812SARTZ-REEL 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 the full −40°C to +85°C operating temperature range. Its temperature coefficient is specified at 30 ppm/°C, meaning threshold drift is tightly bounded and predictable - critical for systems where supply margin must be maintained across environmental extremes. This performance is confirmed in Table 1 and Figure 9 of the ADM811/ADM812 Rev. H datasheet.

Does ADM812SARTZ-REEL provide active-high or active-low reset output, and what are its drive capabilities?

ADM812SARTZ-REEL provides an active-high RESET output, unlike the ADM811 series which outputs active-low. Its RESET pin is open-drain compatible and sources 150 µA at 0.8 × VCC when VCC is between 1.8 V and VTH(MIN). At VCC > VTH(MAX), it sources up to 500 µA. This architecture allows flexible interfacing with diverse logic families via external pull-up resistors - a key feature confirmed in Table 1 and the "RESET Output" section of the datasheet.

What is the minimum manual reset pulse width required for ADM812SARTZ-REEL to trigger a reset?

The ADM812SARTZ-REEL requires a minimum manual reset (MR) pulse width of 10 µs to guarantee recognition, as stated in the "Manual Reset" section and Table 1. The device also provides built-in debounce, rejecting transients shorter than 100 ns. This dual timing specification ensures reliable operation with mechanical switches or noisy digital signals - eliminating the need for external RC filters in most implementations.

Can ADM812SARTZ-REEL operate reliably when VCC drops below 2.0 V, and what happens to the RESET output?

Yes, ADM812SARTZ-REEL maintains valid RESET output down to VCC = 1.0 V, as explicitly specified in the "Supply" table and General Description. Below 1.0 V, RESET no longer sources current and may float; however, the part continues asserting RESET high until VCC falls below the 1.0 V lower limit. This behavior ensures the microprocessor remains held in reset during controlled power-down sequences - a critical safety feature documented in Figure 11 and the "Ensuring a Valid RESET Output Down to VCC = 0 V" section.

Is ADM812SARTZ-REEL RoHS compliant, and what does the 'Z' suffix indicate in its part number?

Yes, ADM812SARTZ-REEL is RoHS compliant. The 'Z' suffix in the part number explicitly denotes conformance to EU RoHS Directive 2011/65/EU, indicating lead-free, halogen-free construction and packaging per Analog Devices' ordering guide (Page 10, Note 2). This includes JEDEC-compliant RA-4 (SOT-143) packaging with appropriate marking (M67 branding) and reflow profile compatibility - verified in the official Analog Devices ordering documentation.