Analog Devices Inc. ADM1817-20ART-RL7

Overview

ADM1817-20ART-RL7 from Analog Devices is a microprocessor reset circuit with active high push-pull output, 2.55 V typical reset threshold, 150 ms reset timeout, and operation over −40°C to +105°C. It monitors 2.5 V/3.0 V/3.3 V supplies in embedded controllers and industrial microprocessor systems requiring reliable power-on initialization.

For engineers reviewing the ADM1817-20ART-RL7 datasheet, ADM1817-20ART-RL7 pinout, ADM1817-20ART-RL7 application, or ADM1817-20ART-RL7 equivalent, key selection criteria include reset threshold accuracy (±1.5% typical), ultra-low quiescent current (≤10 µA at 3.6 V), SOT-23 package compatibility, and guaranteed 150 ms power-up delay for safe system boot.

Technical Context

The ADM1817-20ART-RL7 integrates a precision voltage reference, comparator, and 150 ms internal timing circuit to generate a clean, glitch-free active high reset signal upon power-up or brownout. Its trip point is factory-trimmed to 2.55 V (typical) with ±1.5% tolerance over temperature.

It features push-pull output capable of sourcing 350 µA when asserted and sinking 8 mA when deasserted, eliminating need for external pull-up resistors. The device operates from 1.2 V to 5.5 V supply and draws only 4–10 µA quiescent current depending on VCC level.

Key Specifications

Pinout & Package

ADM1817-20ART-RL7 is housed in a 3-lead SOT-23 (RT-3) package with gull-wing leads, JEDEC TO-236-AB compliant, 1.3 mm maximum height, and thermal resistance θJA = 270°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT25+T and TPS3808G12DBVR, the ADM1817-20ART-RL7 offers optimal balance of precision (±1.5%), ultra-low current (4 µA), and minimal footprint (3-pin SOT-23) for cost-sensitive 2.5 V reset applications where no manual reset or watchdog is needed.

Availability

ADM1817-20ART-RL7 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADM1817-20ART-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADM181x series was designed specifically for reliable, low-cost microprocessor reset supervision in space-constrained industrial and automotive systems, emphasizing precision threshold stability and ultra-low power consumption.

FAQ

What is the exact reset threshold voltage for ADM1817-20ART-RL7?

The ADM1817-20ART-RL7 has a factory-trimmed reset threshold of 2.55 V typical, with a guaranteed range of 2.47 V to 2.64 V over −40°C to +105°C per Table 1 in the Rev. F datasheet. This value is specified for the "-20" variant and applies directly to the ADM1817-20ART-RL7 part number.

Does ADM1817-20ART-RL7 require an external pull-up resistor?

No, ADM1817-20ART-RL7 does not require an external pull-up resistor because it features an active high push-pull output stage. The RST pin can directly drive standard CMOS reset inputs without additional components, unlike open-drain alternatives such as ADM1816-20ARTZ-RL7.

What package type is used for ADM1817-20ART-RL7?

ADM1817-20ART-RL7 uses the 3-lead SOT-23 (RT-3) package, measuring 2.9 mm × 1.3 mm with gull-wing leads. This is confirmed in the Ordering Guide (Page 9) and Outline Dimensions (Page 8) of the ADM1810–ADM1818 Rev. F datasheet.

Can ADM1817-20ART-RL7 be used to monitor a 3.3 V supply?

Yes, ADM1817-20ART-RL7 is suitable for monitoring 3.3 V supplies because its 2.55 V reset threshold provides adequate hysteresis margin-ensuring reset deassertion occurs well above minimum 3.3 V rail tolerance (typically ±5%). The ADM1817 family explicitly lists 3.3 V as a supported supply voltage in the General Description.

What is the reset timeout duration for ADM1817-20ART-RL7?

The ADM1817-20ART-RL7 provides a guaranteed reset active time of 100 ms to 250 ms, with 150 ms typical, measured from VCC crossing the threshold until RST transitions to inactive state. This timing is internally generated and independent of external components.