Analog Devices Inc. ADM1817-R23ART-RL7

Overview

ADM1817-R23ART-RL7 from Analog Devices is an active-high push-pull microprocessor reset circuit designed to monitor 2.5 V, 3 V, and 3.3 V power supplies. It features a precise 2.31 V (typical) reset threshold, 150 ms reset timeout, and operates across −40°C to +105°C. Used in embedded controllers and industrial microprocessor systems to ensure safe power-up initialization.

For engineers reviewing the ADM1817-R23ART-RL7 datasheet, ADM1817-R23ART-RL7 pinout, ADM1817-R23ART-RL7 application, or ADM1817-R23ART-RL7 equivalent, key selection criteria include trip point accuracy, active-high output compatibility with MCU reset inputs, SOT-23 package footprint, supply current under 16 µA, and guaranteed reset assertion during brownout conditions.

Technical Context

The ADM1817-R23ART-RL7 integrates a precision voltage reference, comparator, and 150 ms delay timer in a single monolithic IC. Its internal architecture ensures reset remains asserted while VCC is below 2.31 V (typ), then holds for 150 ms after VCC rises above threshold - preventing premature system startup before supply stabilization.

This device belongs to the ADM181x family of dedicated reset supervisors with fixed thresholds and no external adjustment. Unlike open-drain variants (e.g., ADM1816/ADM1818), it delivers a push-pull RST output capable of sourcing 350 µA and sinking 8 mA, eliminating need for external pull-up resistors when interfacing with standard CMOS reset inputs.

Key Specifications

Pinout & Package

ADM1817-R23ART-RL7 is housed in a 3-lead SOT-23 (RT-3) package, measuring 2.90 mm × 1.30 mm × 1.02 mm, with gull-wing leads and JEDEC TO-236-AB compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2T and TPS3808G12QDBVRQ1, the ADM1817-R23ART-RL7 offers identical threshold and package but delivers guaranteed 150 ms timeout with no external components - simplifying design validation for industrial applications where AEC-Q100 is not required.

Availability

ADM1817-R23ART-RL7 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical handheld diagnostics, and smart energy meters requiring stable component supply with long-term lifecycle support.

Supply support for ADM1817-R23ART-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADM181x product line was engineered specifically for robust, low-cost microprocessor reset supervision in space-constrained industrial and automotive systems - prioritizing threshold accuracy, temperature stability, and direct MCU interface capability.

FAQ

What is the exact reset threshold voltage of the ADM1817-R23ART-RL7?

The ADM1817-R23ART-RL7 has a nominal reset threshold of 2.31 V (typical), with guaranteed limits of 2.25 V (min) and 2.37 V (max) over the full −40°C to +105°C temperature range. This value is factory-trimmed and specified in Table 1 of the Rev. F datasheet under the "ADM1815-R23" row, which applies identically to ADM1817-R23ART-RL7 as confirmed in the Ordering Guide.

Does the ADM1817-R23ART-RL7 require any external components to operate?

No, the ADM1817-R23ART-RL7 requires no external components. Its active-high push-pull output drives MCU reset inputs directly, and its internal voltage reference and timing capacitor eliminate need for external RC networks. Only VCC, GND, and RST connections are needed - verified in Figure 13 ("ADM1810/ADM1812/ADM1815/ADM1817 Typical Application") of the datasheet.

Is the ADM1817-R23ART-RL7 pin-compatible with other ADM181x variants in SOT-23?

Yes, all ADM181x devices in RT-3 (SOT-23) packaging - including ADM1817-R23ART-RL7 - share identical 3-pin pinout (RST, VCC, GND) and mechanical footprint per Figures 2 and 15. However, output polarity (active-high vs. active-low) and threshold differ between part numbers, so electrical compatibility must be verified per application requirements.

What is the maximum supply voltage the ADM1817-R23ART-RL7 can withstand?

The ADM1817-R23ART-RL7 has an absolute maximum VCC rating of +6.0 V, but its functional operating range is 1.2 V to 5.5 V as specified in Table 1. Operation above 5.5 V may cause permanent damage; sustained operation at 6.0 V is not permitted per Absolute Maximum Ratings (Table 2).

How does the reset timeout behave during a power supply dip?

When VCC falls below the 2.31 V threshold, the ADM1817-R23ART-RL7 asserts RST high immediately (within 10 µs). Upon recovery, RST remains high for 150 ms (typical) after VCC exceeds threshold - ensuring the monitored supply remains stable before releasing reset. This behavior is defined in the "RESET ACTIVE TIME" and "Falling/Rising" timing parameters of Table 1.