Analog Devices Inc. ADM1817-20ARTZ-RL7

Overview

ADM1817-20ARTZ-RL7 from Analog Devices is an active-high push-pull microprocessor reset circuit designed to monitor 2.5 V supply rails. It features a 2.55 V (typical) reset threshold, 150 ms reset timeout, ±1.5% trip point accuracy over −40°C to +105°C, and ultra-low 4–10 µA supply current at 3.6 V. It ensures safe system initialization in embedded controllers and industrial microprocessor systems.

For engineers reviewing the ADM1817-20ARTZ-RL7 datasheet, ADM1817-20ARTZ-RL7 pinout, ADM1817-20ARTZ-RL7 application, or ADM1817-20ARTZ-RL7 equivalent, key selection criteria include active-high output compatibility with MCU reset inputs, 2.55 V trip point for 2.5 V rail supervision, SOT-23 package footprint, and guaranteed reset assertion during power-up/down transients.

Technical Context

The ADM1817-20ARTZ-RL7 integrates a precision voltage reference, comparator, and 150 ms delay timer to generate a clean, glitch-free reset pulse. Its internal architecture guarantees reset remains asserted for ≥150 ms after VCC rises above 2.55 V (typ), ensuring stable power supply settling before processor release.

This device operates across the full industrial temperature range (−40°C to +105°C) with supply voltage support from 1.2 V to 5.5 V and exhibits <±1.5% trip point variation over temperature-critical for reliable low-voltage system supervision where margin is constrained.

Key Specifications

Pinout & Package

ADM1817-20ARTZ-RL7 is housed in a 3-lead SOT-23 (RT-3) package with gull-wing leads, compliant to JEDEC TO-236-AB standards. Pin 1 is RST (active-high reset output), Pin 2 is VCC (monitored supply input), and Pin 3 is GND (0 V reference). The compact 2.90 mm × 1.30 mm body supports high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–25D2T+ and TPS3808G12DBVR, the ADM1817-20ARTZ-RL7 delivers optimized integration for 2.5 V rail supervision-offering fixed-accuracy trip point, guaranteed 150 ms timing, and zero-component push-pull drive-reducing validation effort and improving long-term reliability in cost-sensitive industrial designs.

Availability

ADM1817-20ARTZ-RL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical sensor nodes, automotive body control modules, and smart energy meter subsystems requiring stable component supply with RoHS-compliant packaging and full temperature-range qualification.

Supply support for ADM1817-20ARTZ-RL7 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 since 1965.

The ADM181x series was engineered specifically for reliable, low-cost power-supply monitoring in space-constrained microprocessor systems-emphasizing precision trip points, guaranteed timing, and minimal external component count.

FAQ

What is the exact reset threshold voltage of the ADM1817-20ARTZ-RL7?

The ADM1817-20ARTZ-RL7 has a nominal reset threshold of 2.55 V (typical), with guaranteed limits of 2.47 V (min) and 2.64 V (max) across −40°C to +105°C. This value is factory-trimmed and specified in Table 1 of the Rev. F datasheet under "VCC TRIP POINT" for the -20 variant. It is designed explicitly for 2.5 V supply supervision with sufficient margin against ripple and noise.

Does the ADM1817-20ARTZ-RL7 require an external pull-up resistor on its RST pin?

No, the ADM1817-20ARTZ-RL7 does not require an external pull-up resistor. It features an active-high push-pull output stage that actively drives the RST pin high when asserted and low when released-enabling direct connection to standard microprocessor reset inputs without additional components.

What package type and lead finish does the ADM1817-20ARTZ-RL7 use?

The ADM1817-20ARTZ-RL7 uses a 3-lead SOT-23 (RT-3) package with gull-wing leads and Pb-free (RoHS-compliant) matte tin plating. The "Z" suffix in the part number confirms RoHS compliance, and the "RL7" denotes a 7-inch reel packaging format containing 3,000 units.

Can the ADM1817-20ARTZ-RL7 monitor voltages other than 2.5 V?

The ADM1817-20ARTZ-RL7 is specifically trimmed for 2.55 V (typical) threshold operation and is not adjustable. While it functions with supply voltages from 1.2 V to 5.5 V, its reset assertion is only valid relative to its fixed 2.55 V trip point. For other rails (e.g., 3.3 V or 5 V), select variants like ADM1817-5 (3.06 V) or ADM1817-10 (2.88 V).

How does the reset timeout behavior work during power-down events for the ADM1817-20ARTZ-RL7?

During power-down, the ADM1817-20ARTZ-RL7 asserts reset when VCC falls below 2.55 V and maintains the active-high state until VCC drops below 1.2 V (minimum operating voltage). The reset remains asserted throughout undervoltage conditions and releases only after VCC rises above 2.55 V and sustains for ≥150 ms-ensuring clean release after full rail recovery.