Analog Devices Inc. ADM1817-R23AKS-RL

Overview

ADM1817-R23AKS-RL from Analog Devices is a 3-pin SOT-23-3 packaged supervisory circuit providing reset functionality with 2.3 V threshold, active-low open-drain output, and 240 ms minimum reset pulse width. It monitors power supply voltage in microcontroller-based systems and asserts reset during power-up, brownout, or undervoltage conditions. Used in embedded instrumentation and industrial control modules requiring reliable power-on initialization.

For engineers reviewing the ADM1817-R23AKS-RL datasheet, ADM1817-R23AKS-RL pinout, ADM1817-R23AKS-RL application, or ADM1817-R23AKS-RL equivalent, key selection criteria include reset threshold accuracy (±1.5%), guaranteed reset assertion at V_CC ≤ 2.23 V, temperature stability over –40°C to +85°C, and compatibility with 3.3 V/5 V logic rails.

Technical Context

The ADM1817-R23AKS-RL implements a precision bandgap reference and comparator-based monitoring architecture. It features an internal hysteresis of 100 mV to prevent chatter near the 2.3 V trip point and guarantees reset deassertion only after V_CC rises above 2.36 V and remains stable for ≥240 ms.

This device operates without external components and draws only 10 µA typical quiescent current. Its open-drain RESET output requires an external pull-up resistor and supports bidirectional reset signaling in multi-voltage domain systems.

Key Specifications

Pinout & Package

SOT-23-3 package (JEDEC MO-178AA), 1.4 mm × 2.9 mm footprint, 1.1 mm height, gull-wing leads, RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SEUR+T, the ADM1817-R23AKS-RL delivers tighter threshold tolerance and longer guaranteed reset pulse width; compared with TPS3808G12QDBVRQ1, it offers simpler implementation with no external timing components while maintaining industrial-grade reliability.

Availability

ADM1817-R23AKS-RL is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and smart metering applications requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.

Supply support for ADM1817-R23AKS-RL 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 ADM1817 series belongs to Analog Devices' precision supervisory IC product line, engineered for deterministic power-on reset generation in mission-critical embedded systems where reliability and parameter stability are non-negotiable.

FAQ

What is the reset threshold voltage of the ADM1817-R23AKS-RL?

The ADM1817-R23AKS-RL has a nominal reset threshold of 2.3 V with a tolerance of ±1.5% over the full operating temperature range (–40°C to +85°C). This means the device asserts reset when V_CC falls to 2.23 V or below and releases reset only after V_CC rises to at least 2.36 V and remains stable for 240 ms. The ADM1817-R23AKS-RL is specified to meet this performance without external calibration.

Does the ADM1817-R23AKS-RL require external components to function?

No, the ADM1817-R23AKS-RL operates autonomously with no external resistors, capacitors, or diodes required. Its internal precision reference, comparator, and timer circuitry are fully integrated. Only an external pull-up resistor on the open-drain RESET pin is needed for proper logic-level translation - a standard design practice for open-drain outputs. The ADM1817-R23AKS-RL is optimized for minimal BOM impact and layout simplicity.

What package type and pin configuration does the ADM1817-R23AKS-RL use?

The ADM1817-R23AKS-RL is housed in a JEDEC-standard SOT-23-3 package (MO-178AA), with pin 1 = V_CC, pin 2 = GND, and pin 3 = RESET (open-drain output). The tape-and-reel packaging follows EIA-481 standards, with Pin 1 orientation designated as "C4" - meaning Pin 1 is located at the top-left corner when the sprocket holes face the observer and tape feeds counterclockwise. This matches the ADM1817-R23AKS-RL's documented mechanical configuration.

How does the ADM1817-R23AKS-RL handle supply voltage transients?

The ADM1817-R23AKS-RL incorporates 100 mV of internal hysteresis to suppress false resets caused by brief supply dips or noise. It asserts reset only when V_CC crosses below 2.23 V and maintains reset until V_CC exceeds 2.36 V and sustains that level for ≥240 ms. This dual-voltage + timeout mechanism ensures immunity to fast transients while guaranteeing clean release after true supply stabilization. The ADM1817-R23AKS-RL is validated for operation under these conditions across its full temperature range.

Is the ADM1817-R23AKS-RL suitable for automotive applications?

The ADM1817-R23AKS-RL is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. While it functions reliably in automotive body electronics with benign thermal profiles, it is not recommended for under-hood or safety-critical domains. For automotive-grade alternatives, consider AEC-Q100 qualified parts such as the TPS3808G12QDBVRQ1. The ADM1817-R23AKS-RL remains ideal for industrial, medical, and metering applications where industrial qualification suffices.