Analog Devices Inc. ADM1815-R22ART-RL7

Overview

ADM1815-R22ART-RL7 from Analog Devices is an active-low, push-pull microprocessor reset circuit designed to monitor 2.18 V supply rails in space-constrained embedded systems. It delivers a guaranteed 150 ms reset timeout after power-up, sinks up to 8 mA at 0.4 V, draws only 4–10 µA quiescent current, and operates across −40°C to +105°C for industrial and automotive control applications.

For engineers reviewing the ADM1815-R22ART-RL7 datasheet, ADM1815-R22ART-RL7 pinout, ADM1815-R22ART-RL7 application, or ADM1815-R22ART-RL7 equivalent, key selection criteria include its precise 2.18 V trip point (typ), SOT-23 package footprint, push-pull output drive capability, reset timing stability over temperature, and compatibility with low-voltage microcontrollers requiring reliable power-on initialization.

Technical Context

The ADM1815-R22ART-RL7 implements a precision voltage comparator with internal reference and fixed 150 ms reset delay timer. Its active-low push-pull output directly interfaces with MCU reset inputs without external pull-ups or level-shifting components.

It features a dedicated reset threshold of 2.18 V (typ) with ±3% tolerance over full temperature range, supports supply voltages from 1.2 V to 5.5 V, and maintains reset assertion during brown-out conditions until VCC rises above threshold and stabilizes for ≥150 ms.

Key Specifications

Pinout & Package

ADM1815-R22ART-RL7 is housed in a 3-lead SOT-23 (RT-3) package with JEDEC TO-236-AB compliance, 2.90 mm × 1.30 mm body size, and 0.95 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809RTRG+T and TPS3808G12DBVR, ADM1815-R22ART-RL7 offers direct push-pull interfacing, lowest quiescent current (4 µA), and optimized 2.18 V trip for 2.5 V rail supervision-making it ideal for compact, low-power industrial and automotive reset circuits without design compromises.

Availability

ADM1815-R22ART-RL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical sensor hubs, and smart energy meters requiring stable component supply with guaranteed long-term availability.

Supply support for ADM1815-R22ART-RL7 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-delivering precision voltage monitoring, fixed reset timing, and robust thermal performance in minimal-footprint packages.

FAQ

What is the exact reset threshold voltage of the ADM1815-R22ART-RL7?

The ADM1815-R22ART-RL7 has a nominal reset threshold of 2.18 V (typical), with a guaranteed range of 2.12 V to 2.25 V over −40°C to +105°C per the Rev. F datasheet Table 1. This value is factory-trimmed and applies specifically to the R22 variant, distinguishing it from other ADM1815 versions like R23 (2.31 V) or -10 (2.88 V).

Does the ADM1815-R22ART-RL7 require an external pull-up resistor on the RST pin?

No, the ADM1815-R22ART-RL7 uses an active-low push-pull output stage, so no external pull-up resistor is needed. Unlike open-drain variants (e.g., ADM1816-R22), this device drives RST high actively when not asserting reset-enabling direct connection to standard CMOS reset inputs without additional components.

What package type and footprint does the ADM1815-R22ART-RL7 use?

The ADM1815-R22ART-RL7 is supplied in a 3-lead SOT-23 (RT-3) package per JEDEC TO-236-AB, with pin 1 = RST, pin 2 = VCC, pin 3 = GND. Its 2.90 mm × 1.30 mm outline and 0.95 mm max height support high-density PCB assembly using standard reflow profiles.

Can the ADM1815-R22ART-RL7 be used to monitor a 2.5 V supply rail?

Yes-the ADM1815-R22ART-RL7's 2.18 V threshold provides appropriate undervoltage detection margin for a nominal 2.5 V rail, allowing for ±5% regulation tolerance and noise headroom. Its specification explicitly lists suitability for 2.5 V supply monitoring in the General Description and Ordering Guide.

What is the reset timeout duration of the ADM1815-R22ART-RL7 after power-up?

The ADM1815-R22ART-RL7 guarantees a reset timeout of 100 ms minimum and 250 ms maximum, with 150 ms typical, measured from VCC crossing the 2.18 V threshold until RST deasserts. This delay is internally generated and temperature-stable, ensuring consistent power-on sequencing across operating conditions.