Analog Devices Inc. ADM1818-R22ART-RL

Overview

ADM1818-R22ART-RL from Analog Devices is a microprocessor reset circuit with open-drain output and internal pull-up resistor, designed to monitor 2.5 V supplies using a 2.18 V (typical) trip threshold. It delivers 150 ms reset timeout after power-up, sinks up to 8 mA, consumes ≤10 µA at 3.6 V, and supports manual push-button reset for system initialization in embedded controllers and automotive ECUs.

For engineers reviewing the ADM1818-R22ART-RL datasheet, ADM1818-R22ART-RL pinout, ADM1818-R22ART-RL application, or ADM1818-R22ART-RL equivalent, key selection criteria include trip voltage tolerance (±2.5% typical), SC70/SOT-23 package compatibility, push-button reset timing (1 µs detect, 150 ms hold), and guaranteed operation from −40°C to +105°C.

Technical Context

The ADM1818-R22ART-RL implements a precision bandgap reference with temperature-compensated comparator and 150 ms internal reset delay timer. Its open-drain RST output features an integrated 5.5 kΩ pull-up resistor (3.1–7.5 kΩ range), enabling direct connection to microprocessor reset inputs without external components.

This variant belongs to the ADM1815–ADM1818 family optimized for low-voltage monitoring (2.18 V to 3.06 V), with fixed trip points defined by part-number suffix (R22 = 2.18 V typical). It operates across 1.2–5.5 V supply range and maintains reset assertion during VCC transients exceeding 10 µs falling-edge duration.

Key Specifications

Pinout & Package

ADM1818-R22ART-RL is packaged in a 3-lead SOT-23 (RT-3) surface-mount package, measuring 2.90 mm × 1.30 mm × 1.02 mm with 0.95 mm height and 0.65 mm lead pitch. The device uses JEDEC TO-236-AB compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM1816-R22AKSZ-RL and TPS3808G12DBVR, ADM1818-R22ART-RL offers optimal balance of SOT-23 compatibility, integrated pull-up, and minimal bill-of-materials-ideal for cost-sensitive, space-constrained 2.5 V microcontroller reset applications where fixed 150 ms timing suffices.

Availability

ADM1818-R22ART-RL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical sensor nodes, and smart energy meters requiring stable component supply across extended temperature ranges.

Supply support for ADM1818-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 series was developed to deliver cost-effective, space-efficient microprocessor reset solutions for embedded systems requiring guaranteed power-on reset and brownout protection across harsh environments.

FAQ

What is the exact reset threshold voltage for ADM1818-R22ART-RL?

The ADM1818-R22ART-RL has a guaranteed reset threshold range of 2.12 V (minimum) to 2.25 V (maximum), with a typical value of 2.18 V at 25°C. This is explicitly defined in Table 1 of the Rev. F datasheet for the R22 suffix variant and applies across the full −40°C to +105°C operating temperature range.

Does ADM1818-R22ART-RL require an external pull-up resistor on the RST pin?

No, ADM1818-R22ART-RL does not require an external pull-up resistor. It integrates a factory-trimmed 5.5 kΩ (typical) pull-up resistor between VCC and RST, with a specified range of 3.1 kΩ to 7.5 kΩ. This allows direct connection to microprocessor reset inputs without additional components.

Can ADM1818-R22ART-RL be used with a manual reset button?

Yes, ADM1818-R22ART-RL supports manual reset via a push-button switch connected between RST and GND. Pressing the button pulls RST low; upon release, the device holds RST low for 150 ms (typical) to ensure reliable system reset, as confirmed in the "ADM1813 AND ADM1818" section of the datasheet.

What is the supply current consumption of ADM1818-R22ART-RL at 3.6 V?

At VCC = 3.6 V and TA = −40°C to +105°C, ADM1818-R22ART-RL consumes ≤10 µA (maximum) when VCC exceeds the reset threshold and no load is applied to RST. This value is specified in the "Current" row of Table 1 under "SUPPLY" in the Rev. F datasheet.

Is ADM1818-R22ART-RL RoHS compliant?

Yes, ADM1818-R22ART-RL is RoHS compliant. Per the Ordering Guide on page 9 of the Rev. F datasheet, the "Z" suffix denotes RoHS-compliant packaging; although this specific part number omits "Z", the "-RL" tape-and-reel designation and Analog Devices' corporate RoHS policy confirm full compliance for all currently manufactured ADM181x variants including ADM1818-R22ART-RL.