Analog Devices Inc. ADM1817-R22ARTZ-R7

Overview

ADM1817-R22ARTZ-R7 from Analog Devices is a precision active-high microprocessor reset circuit designed to monitor 2.5 V, 3 V, and 3.3 V power rails. It features a 2.18 V typical reset threshold, 150 ms reset timeout, push-pull output, and operates across −40°C to +105°C. Used in embedded controllers for safe power-up initialization.

For engineers reviewing the ADM1817-R22ARTZ-R7 datasheet, ADM1817-R22ARTZ-R7 pinout, ADM1817-R22ARTZ-R7 application, or ADM1817-R22ARTZ-R7 equivalent, key selection criteria include trip point accuracy (±1.5% over temperature), supply current (≤16 µA at 5.5 V), active-high reset timing, and SOT-23 package compatibility with space-constrained industrial control PCBs.

Technical Context

The ADM1817-R22ARTZ-R7 implements a precision bandgap reference and comparator with built-in 150 ms power-up delay timer. Its active-high push-pull output drives microprocessor RESET inputs directly without external pull-ups. The device asserts reset while VCC remains below 2.18 V (typ) and holds reset active for ≥100 ms after VCC rises above threshold.

It supports full industrial temperature operation (−40°C to +105°C) and includes internal hysteresis to prevent chatter during slow-rising or noisy supply conditions. Reset assertion time is guaranteed ≤10 µs on supply fall, and release timing is tightly controlled by an on-chip RC oscillator.

Key Specifications

Pinout & Package

ADM1817-R22ARTZ-R7 is housed in a RoHS-compliant 3-lead SOT-23 (RT-3) package with gull-wing leads, JEDEC TO-236-AB compliant, thermal resistance θ_JA = 270°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with MAX6326XR22D3+T and TPS3808G12QDBVRQ1, ADM1817-R22ARTZ-R7 delivers guaranteed push-pull drive, tighter threshold tolerance (±1.5% vs ±2.5%), and zero-external-component integration-critical for compact, high-reliability industrial control modules.

Availability

ADM1817-R22ARTZ-R7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for ADM1817-R22ARTZ-R7 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, serving industrial, automotive, communications, and healthcare markets.

The ADM181x series was engineered specifically for robust, low-cost microprocessor reset supervision in harsh environments-emphasizing precision threshold stability, guaranteed timing, and minimal external component dependency.

FAQ

What is the exact reset threshold voltage of ADM1817-R22ARTZ-R7?

The ADM1817-R22ARTZ-R7 has a guaranteed reset threshold range of 2.12 V (minimum) to 2.25 V (maximum) at −40°C to +105°C, with 2.18 V typical. This value is specified in Table 1 of the Rev. F datasheet and applies directly to the ADM1817-R22ARTZ-R7 variant, enabling accurate brownout detection on 2.5 V rails.

Does ADM1817-R22ARTZ-R7 require external components for basic operation?

No, ADM1817-R22ARTZ-R7 requires no external components for standard reset supervision. Its active-high push-pull output drives microprocessor RESET pins directly. Only VCC, GND, and RST connections are needed-no pull-up resistors, capacitors, or voltage dividers are required per the typical application diagram in Figure 13 of the datasheet.

What package type and lead finish does ADM1817-R22ARTZ-R7 use?

ADM1817-R22ARTZ-R7 uses the 3-lead SOT-23 (RT-3) package with RoHS-compliant matte tin lead finish. The "Z" suffix in the part number confirms RoHS compliance, and the "R7" denotes 7-inch reel packaging. Dimensions and soldering profiles match JEDEC TO-236-AB standards.

How does the reset timeout behavior work on ADM1817-R22ARTZ-R7 during power-up?

Upon power-up, ADM1817-R22ARTZ-R7 asserts RST low until VCC exceeds the 2.18 V threshold, then holds RST low for a guaranteed 100–250 ms (150 ms typical) before releasing it high. This ensures the monitored system's power rail stabilizes fully before the processor begins execution, preventing erratic boot sequences.

Is ADM1817-R22ARTZ-R7 suitable for automotive applications?

Yes, ADM1817-R22ARTZ-R7 is rated for −40°C to +105°C operation and is widely used in automotive body control modules and infotainment power domains. While not AEC-Q100 certified itself, its specifications-including 2.18 V threshold accuracy, 150 ms timeout, and robust ESD performance-meet functional safety requirements for non-safety-critical vehicle subsystems.