Analog Devices Inc. ADM1816-20ARTZ-RL

Overview

ADM1816-20ARTZ-RL from Analog Devices is a low-power, open-drain microprocessor reset circuit with internal pull-up resistor, designed for monitoring 2.5 V power supplies. It features a 2.55 V typical reset threshold, 150 ms reset timeout, −40°C to +105°C operating temperature range, and SOT-23 package. Used in embedded controllers to ensure safe system initialization after power-on.

For engineers reviewing the ADM1816-20ARTZ-RL datasheet, ADM1816-20ARTZ-RL pinout, ADM1816-20ARTZ-RL application, or ADM1816-20ARTZ-RL equivalent, key selection criteria include reset threshold accuracy (±1.5% over temperature), ultra-low quiescent current (≤10 µA at 3.6 V), open-drain output compatibility with 3.3 V/2.5 V logic, and industrial-grade thermal performance (θ_JA = 270°C/W).

Technical Context

The ADM1816-20ARTZ-RL integrates a precision voltage reference, comparator, and 150 ms delay timer to generate a reliable active-low reset signal when V_CC falls below 2.55 V (typical) or during power-up until stabilization. Its open-drain output with 5.5 kΩ internal pull-up enables wired-OR configuration and direct interface with microcontroller reset inputs requiring external pull-up.

Unlike push-pull variants, this device avoids contention in multi-source reset buses and supports manual reset via external push-button connected between RST and GND - though ADM1816 lacks push-button timing circuitry (unlike ADM1813/ADM1818), so external debouncing is required for button-initiated resets.

Key Specifications

Pinout & Package

ADM1816-20ARTZ-RL uses a 3-lead SOT-23 (RT-3) package with standard pinout: Pin 1 = RST (active-low open-drain reset output), Pin 2 = V_CC (monitored supply input), Pin 3 = GND (0 V reference). The internal 5.5 kΩ pull-up connects to V_CC, enabling direct connection to microcontroller reset pins without external components.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326-L25-T and TPS3808G125DBVR, ADM1816-20ARTZ-RL uniquely combines internal pull-up, industrial temperature range, and SOT-23 footprint - making it optimal for space-constrained, multi-source reset architectures in 2.5 V systems where board-level integration reduces risk of floating reset lines.

Availability

ADM1816-20ARTZ-RL is available at Aetrix Electronics and suitable for industrial PLC controllers, medical sensor nodes, automotive body control modules, and smart energy meter subsystems requiring stable component supply with full RoHS compliance and extended temperature support.

Supply support for ADM1816-20ARTZ-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, 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 cost-sensitive, space-constrained microprocessor reset supervision in industrial, automotive, and instrumentation applications - emphasizing low quiescent current, precise threshold stability, and simplified board design through integrated pull-up resistors.

FAQ

What is the exact reset threshold voltage for ADM1816-20ARTZ-RL, and how does it vary with temperature?

The ADM1816-20ARTZ-RL has a nominal reset threshold of 2.55 V (typical), with a guaranteed range of 2.47 V (min) to 2.64 V (max) across −40°C to +105°C. According to Table 1 in the Rev. F datasheet, the threshold exhibits ±1.5% deviation over temperature, ensuring consistent 2.5 V supply monitoring without recalibration. This specification applies directly to ADM1816-20ARTZ-RL and is validated per Analog Devices' production test flow.

Does ADM1816-20ARTZ-RL support manual reset via push-button, like ADM1813 or ADM1818?

No, ADM1816-20ARTZ-RL does not include built-in push-button reset timing circuitry. While its RST pin is open-drain and can be pulled low externally, the device lacks the 1 µs detect-to-reset delay and 150 ms post-release hold time found in ADM1813/ADM1818. For manual reset functionality, an external RC network or dedicated reset supervisor with push-button support must be used alongside ADM1816-20ARTZ-RL.

What is the internal pull-up resistor value on the RST pin of ADM1816-20ARTZ-RL, and is it connected to VCC?

The ADM1816-20ARTZ-RL integrates a 5.5 kΩ (typical) internal pull-up resistor on the RST pin, with a specified range of 3.5 kΩ to 7.5 kΩ. This resistor connects directly to the V_CC pin - meaning the pull-up voltage follows the monitored supply rail. As confirmed in Table 1 and Figure 14 of the datasheet, no external pull-up is required for standard 2.5 V or 3.3 V logic interfacing, simplifying design for ADM1816-20ARTZ-RL implementations.

Can ADM1816-20ARTZ-RL be used to monitor a 3.3 V supply instead of 2.5 V?

Yes, ADM1816-20ARTZ-RL can monitor a 3.3 V supply, but it will assert reset when that rail drops below 2.55 V - providing undervoltage protection at a 23% headroom margin. This is appropriate for detecting severe brownouts but not for precise 3.3 V regulation monitoring. For dedicated 3.3 V supervision, Analog Devices specifies ADM1816-10ARTZ-RL (2.88 V threshold) or ADM1816-5ARTZ-RL (3.06 V threshold) as functionally matched alternatives in the same SOT-23 package.

Is ADM1816-20ARTZ-RL pin-compatible with other devices in the ADM181x family, such as ADM1815-20ARTZ-RL?

Yes, ADM1816-20ARTZ-RL is pin-compatible with all 3-lead SOT-23 variants in the ADM181x family, including ADM1815-20ARTZ-RL, ADM1817-20ARTZ-RL, and ADM1818-20ARTZ-RL. All share identical pinout (RST/V_CC/GND), package dimensions, and thermal characteristics. The only functional differences lie in output type (all ADM1815/16/17/18 variants use open-drain) and reset threshold - allowing direct substitution when the 2.55 V trip point meets system requirements.