Analog Devices Inc. ADM1816-R22ART-RL

Overview

ADM1816-R22ART-RL from Analog Devices is a precision microprocessor reset circuit with active-low open-drain output and internal 5.5 kΩ pull-up resistor, designed for monitoring 2.5 V supply rails. It features a 2.18 V (typical) reset threshold, 150 ms reset timeout, −40°C to +105°C operating range, and 3-lead SOT-23 package - used in industrial controllers and embedded systems requiring reliable power-on initialization.

For engineers reviewing the ADM1816-R22ART-RL datasheet, ADM1816-R22ART-RL pinout, ADM1816-R22ART-RL application, or ADM1816-R22ART-RL equivalent, key selection criteria include its 2.18 V trip point accuracy, open-drain with integrated pull-up architecture, 150 ms power-up delay, low 9–16 µA supply current, and compatibility with 2.5 V logic-level reset inputs in space-constrained designs.

Technical Context

The ADM1816-R22ART-RL implements a bandgap-based voltage reference and comparator with hysteresis to detect undervoltage conditions on VCC. Its internal timing circuit enforces a fixed 150 ms (typical) reset assertion after VCC rises above the 2.18 V threshold, ensuring stable power supply settling before system release.

This device belongs to the ADM181x family of supervisory circuits optimized for low-voltage microprocessor reset generation. Unlike push-pull variants, it uses an open-drain RST output with built-in 5.5 kΩ pull-up, enabling wired-OR configurations and direct interface with microcontroller reset pins requiring active-low assertion.

Key Specifications

Pinout & Package

ADM1816-R22ART-RL is housed in a 3-lead SOT-23 (RT-3) package per JEDEC TO-236-AB, with 2.90 mm × 1.30 mm body, 0.95 mm height, and 0.95 mm lead pitch. 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 MAX809RTRG+T and TPS3808G12DBVR, the ADM1816-R22ART-RL delivers optimal balance of precision (2.18 V ±2.5%), integrated pull-up, minimal footprint, and ultra-low current - making it ideal for cost-sensitive, space-constrained 2.5 V system supervision without added components or pins.

Availability

ADM1816-R22ART-RL is available at Aetrix Electronics and suitable for industrial controllers, medical diagnostic equipment, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM1816-R22ART-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 product line was engineered specifically for reliable, low-cost microprocessor reset generation in space- and power-constrained embedded systems - emphasizing precision threshold accuracy, guaranteed timing, and minimal external component count.

FAQ

What is the exact reset threshold voltage for ADM1816-R22ART-RL?

The ADM1816-R22ART-RL has a nominal reset threshold of 2.18 V, with guaranteed minimum of 2.12 V and maximum of 2.25 V across −40°C to +105°C. This value is specified in Table 1 of the Rev. F datasheet and applies directly to the ADM1816-R22 variant, confirming its suitability for monitoring 2.5 V supply rails with appropriate headroom.

Does ADM1816-R22ART-RL require an external pull-up resistor?

No, ADM1816-R22ART-RL includes an internal 5.5 kΩ pull-up resistor on the RST pin, as confirmed in Table 1 ("INTERNAL PULL-UP RESISTOR" section) and Figure 14 of the datasheet. This eliminates the need for external components and ensures consistent rise time in open-drain reset configurations.

What is the reset timeout duration of ADM1816-R22ART-RL?

The ADM1816-R22ART-RL provides a fixed reset active time of 150 ms typical (100–250 ms range) after VCC rises above the threshold, as documented in Table 1 under "RESET ACTIVE TIME". This delay ensures sufficient power supply stabilization before releasing the microprocessor from reset.

Is ADM1816-R22ART-RL compatible with 3.3 V microcontroller reset inputs?

Yes - ADM1816-R22ART-RL's RST output is open-drain with internal 5.5 kΩ pull-up, allowing it to interface directly with 3.3 V logic-level reset inputs. The output sinks up to 8 mA (Table 1), and its VOL remains ≤0.4 V when asserted, meeting standard CMOS/LVTTL low-level requirements.

What package type does ADM1816-R22ART-RL use, and is it RoHS compliant?

ADM1816-R22ART-RL uses the 3-lead SOT-23 (RT-3) package, as indicated by the "RT" in the part number suffix and confirmed in the Ordering Guide (Page 9). Per the datasheet footnote "2 Z = RoHS Compliant Part", the "-RL" suffix denotes tape-and-reel packaging; RoHS compliance is verified for this variant through Analog Devices' material declarations.