Analog Devices Inc. ADM1818-R23ART-RL

Overview

ADM1818-R23ART-RL from Analog Devices is a low-cost, open-drain microprocessor reset circuit with internal pull-up resistor and manual push-button reset capability, designed for monitoring 3 V and 3.3 V power supplies. It features a 2.31 V (typical) reset threshold, 150 ms reset timeout, −40°C to +105°C operating temperature range, and SOT-23 package-used in embedded controllers requiring reliable power-on initialization.

For engineers reviewing the ADM1818-R23ART-RL datasheet, ADM1818-R23ART-RL pinout, ADM1818-R23ART-RL application, or ADM1818-R23ART-RL equivalent, key selection criteria include trip point accuracy (±1.5% typical), ultra-low quiescent current (≤10 µA at 3.6 V), push-button reset timing (1 µs detect → 150 ms assertion), and compatibility with 3 V logic interfaces without external components.

Technical Context

The ADM1818-R23ART-RL implements a precision voltage comparator with built-in hysteresis and a fixed 150 ms power-up delay timer. Its internal reference and bias circuitry ensure stable trip-point performance across temperature (±0.0005%/°C drift) and supply voltage variation.

This device operates exclusively in open-drain mode with an integrated 5.5 kΩ pull-up resistor (3.1–7.5 kΩ range), enabling direct connection to microcontroller reset inputs that accept active-low, open-drain signals. It supports manual reset via external push-button tied between RST and GND, with sub-microsecond detection and guaranteed 150 ms reset hold time after release.

Key Specifications

Pinout & Package

ADM1818-R23ART-RL is housed in a 3-lead SOT-23 (RT-3) package, RoHS-compliant, with 1.3 mm × 2.9 mm footprint and 1.1 mm height-compatible with standard high-speed pick-and-place equipment and reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage monitor with manual reset applications.

Compared with MAX809RTR and TPS3808G12DBVR, ADM1818-R23ART-RL delivers tighter threshold accuracy (±1.5% vs ±2.5%), eliminates external pull-up and debounce components, and provides guaranteed 150 ms reset hold after push-button release-reducing total solution size and qualification effort for fixed 3 V monitoring.

Availability

ADM1818-R23ART-RL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitors, and smart energy meters requiring stable component supply with full lifecycle support.

Supply support for ADM1818-R23ART-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 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 cost-sensitive, space-constrained microprocessor reset supervision-emphasizing low quiescent current, integrated functionality, and robust operation across extended temperature ranges.

FAQ

What is the exact reset threshold voltage for ADM1818-R23ART-RL?

The ADM1818-R23ART-RL has a nominal reset threshold of 2.31 V (typical), with guaranteed minimum and maximum values of 2.25 V and 2.37 V respectively across −40°C to +105°C. This value is factory-trimmed and specified in Table 1 of the Rev. F datasheet under "ADM1815-R23/ADM1816-R23/ADM1817-R23/ADM1818-R23" row.

Does ADM1818-R23ART-RL require an external pull-up resistor?

No, ADM1818-R23ART-RL includes an internal pull-up resistor with a typical value of 5.5 kΩ (range: 3.1–7.5 kΩ), explicitly confirmed in Table 1 under "INTERNAL PULL-UP RESISTOR" for ADM1813/ADM1818. This eliminates the need for external components when interfacing with standard 3 V logic reset inputs.

Can ADM1818-R23ART-RL be used to monitor a 5 V supply?

No-ADM1818-R23ART-RL is optimized for 3 V and 3.3 V supply monitoring with a 2.31 V threshold. For 5 V monitoring, Analog Devices specifies the ADM1813 series (e.g., ADM1813-5ARTZ-RL7 with 4.62 V threshold). Using ADM1818-R23ART-RL on 5 V would assert reset continuously, as VCC exceeds trip point by >100%.

How does the manual push-button reset function work on ADM1818-R23ART-RL?

When a push-button connects RST to GND for >1 µs, ADM1818-R23ART-RL detects the event and holds RST low for 150 ms (typical) after the button is released. This behavior is documented in the "ADM1813 AND ADM1818" section (Page 7) and Figure 12 timing diagram-ensuring reliable hardware-initiated reset without firmware dependency.

What package type and lead finish does ADM1818-R23ART-RL use?

ADM1818-R23ART-RL uses the 3-lead SOT-23 (RT-3) package per JEDEC TO-236-AB, with matte tin lead finish and RoHS-compliant construction (indicated by the "Z" suffix in alternate part numbers like ADM1818-R23ARTZ-RL7). Dimensions are specified in Figure 15 (Page 8) of the datasheet.