Analog Devices Inc. ADM1818-20ART-REEL

Overview

ADM1818-20ART-REEL from Analog Devices is a microprocessor reset circuit with open-drain output and internal pull-up resistor, designed to monitor 3 V supply rails. It features a 2.55 V (typical) reset threshold, 150 ms reset timeout, −40°C to +105°C operating temperature range, and 3-lead SOT-23 package. It supports manual push-button reset and ensures safe system initialization in embedded controllers.

For engineers reviewing the ADM1818-20ART-REEL datasheet, ADM1818-20ART-REEL pinout, ADM1818-20ART-REEL application, or ADM1818-20ART-REEL equivalent, key selection criteria include trip point accuracy (±1.5% typical), low quiescent current (≤10 µA at 3.6 V), push-button compatibility, and SC70/SOT-23 package interchangeability in space-constrained designs.

Technical Context

The ADM1818-20ART-REEL implements a precision voltage comparator with hysteresis and a fixed 150 ms power-up delay timer. Its internal reference achieves ±1.5% trip point tolerance over temperature, enabling reliable detection of 3 V rail undervoltage conditions before microprocessor startup.

It uses an open-drain RST output with integrated 3.1–7.5 kΩ pull-up resistor, eliminating external components for active-low reset assertion. The device asserts reset when VCC falls below 2.55 V (typ) and holds reset for ≥150 ms after VCC rises above threshold, ensuring stable power supply settling.

Key Specifications

Pinout & Package

ADM1818-20ART-REEL is housed in a 3-lead SOT-23 (RT-3) package, compatible with standard pick-and-place equipment and PCB footprints for space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM1816-20AKSZ-RL7 and TPS3808G12DBVR, the ADM1818-20ART-REEL offers optimal balance of SOT-23 manufacturability, integrated pull-up elimination of BOM items, and precise 150 ms timing-making it ideal for cost-sensitive industrial controllers requiring proven assembly yield and minimal external components.

Availability

ADM1818-20ART-REEL 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 across extended temperature ranges and long production lifecycles.

Supply support for ADM1818-20ART-REEL 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 series was engineered specifically for reliable, low-cost microprocessor reset supervision in space- and power-constrained embedded systems, emphasizing precision trip points, integrated functionality, and industrial temperature resilience.

FAQ

What is the exact reset threshold voltage for ADM1818-20ART-REEL?

The ADM1818-20ART-REEL has a nominal reset threshold of 2.55 V (typical), with a guaranteed range of 2.47 V (min) to 2.64 V (max) over −40°C to +105°C. This value is specified in Table 1 of the Rev. F datasheet and applies exclusively to the -20 variant, confirming its suitability for monitoring 3 V supply rails with adequate noise margin.

Does ADM1818-20ART-REEL require an external pull-up resistor?

No, ADM1818-20ART-REEL does not require an external pull-up resistor. It integrates a 3.1–7.5 kΩ internal pull-up on the RST pin, enabling direct connection to microcontroller reset inputs configured for active-low assertion. This feature is explicitly documented in Table 1 under "INTERNAL PULL-UP RESISTOR" for ADM1813/ADM1818 variants.

Can ADM1818-20ART-REEL be used with a manual push-button reset?

Yes, ADM1818-20ART-REEL supports manual push-button reset. As confirmed in the "ADM1813 AND ADM1818" section (Page 7), pressing a switch between RST and GND for ≥1 µs triggers a 150 ms reset pulse upon release. This function is inherent to the ADM1813/ADM1818 family and requires no additional circuitry.

What package type is used by ADM1818-20ART-REEL?

ADM1818-20ART-REEL uses the 3-lead SOT-23 (RT-3) package, as indicated by the "RT-3 (SOT-23)" entry in the Ordering Guide (Page 9) and verified in Figure 15 (Outline Dimensions). Its dimensions are 2.90 mm × 1.60 mm × 1.10 mm, compliant with JEDEC TO-236-AB standards.

What is the maximum supply voltage rating for ADM1818-20ART-REEL?

The absolute maximum supply voltage for ADM1818-20ART-REEL is +6.0 V, per Table 2 ("Absolute Maximum Ratings"). However, its functional operating range is specified as 1.2 V to 5.5 V (Table 1), and it must be operated within this range to ensure guaranteed performance and reliability across the full −40°C to +105°C temperature span.