Analog Devices Inc. ADM1816-R23AKSZ-RL

Overview

ADM1816-R23AKSZ-RL from Analog Devices is a precision 3-pin open-drain microprocessor reset circuit with internal pull-up resistor, designed for monitoring 2.5 V supply rails. It features a 2.31 V typical reset threshold, 150 ms reset timeout, −40°C to +105°C operating range, and SC70 package. It ensures safe power-on initialization in embedded controllers and industrial microprocessor systems.

For engineers reviewing the ADM1816-R23AKSZ-RL datasheet, ADM1816-R23AKSZ-RL pinout, ADM1816-R23AKSZ-RL application, or ADM1816-R23AKSZ-RL equivalent, key selection criteria include reset threshold accuracy (±1.5% over temperature), low quiescent current (≤10 µA at 3.6 V), open-drain output compatibility with I²C-bus logic levels, and SC70 footprint suitability for space-constrained PCBs.

Technical Context

The ADM1816-R23AKSZ-RL implements a bandgap-based voltage reference with comparator hysteresis and a fixed 150 ms power-up delay timer. Its internal 5.5 kΩ pull-up resistor enables direct interface to microcontroller reset inputs without external components.

It operates across full supply range (1.2 V to 5.5 V) and delivers guaranteed reset assertion during brownout conditions down to 1.2 V. The device uses a single-supply architecture with no separate reference or enable pins-reset state is fully determined by VCC relative to its 2.31 V trip point.

Key Specifications

Pinout & Package

ADM1816-R23AKSZ-RL is housed in a 3-lead SC70 (KS-3) package with gull-wing leads. Pin 1 = VCC, Pin 2 = GND, Pin 3 = RST (open-drain active-low reset output).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326-L23T+ and TPS3808G12DBVR, ADM1816-R23AKSZ-RL delivers optimal balance of fixed-accuracy threshold, integrated pull-up, minimal footprint, and industrial temperature support-making it the most direct fit for cost-sensitive, space-constrained 2.5 V reset supervision.

Availability

ADM1816-R23AKSZ-RL is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device applications requiring stable component supply and long-term manufacturability.

Supply support for ADM1816-R23AKSZ-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.

The ADM181x series was engineered specifically for robust, low-cost power-on reset supervision in microprocessor-based systems-emphasizing accuracy, small size, and wide temperature operation without external components.

FAQ

What is the exact reset threshold voltage of ADM1816-R23AKSZ-RL?

The ADM1816-R23AKSZ-RL has a guaranteed reset threshold of 2.25 V minimum, 2.31 V typical, and 2.37 V maximum at −40°C to +105°C. This 2.31 V nominal value is factory-trimmed and specified in Table 1 of the Rev. F datasheet for the R23 variant, making ADM1816-R23AKSZ-RL suitable for precise supervision of 2.5 V supplies.

Does ADM1816-R23AKSZ-RL require an external pull-up resistor on the RST pin?

No, ADM1816-R23AKSZ-RL includes an internal 5.5 kΩ pull-up resistor (3.5–7.5 kΩ range) on the open-drain RST output. This eliminates the need for any external pull-up component, reducing BOM count and PCB area-confirmed in Table 1 "INTERNAL PULL-UP RESISTOR" and Figure 14 of the ADM1810–ADM1818 datasheet.

Can ADM1816-R23AKSZ-RL operate with a 1.8 V supply?

No, ADM1816-R23AKSZ-RL requires a minimum supply voltage of 1.2 V to function, but its reset threshold is fixed at 2.31 V. Therefore, it cannot supervise a 1.8 V rail-it is designed exclusively for 2.5 V systems where VCC ≥ 2.31 V during normal operation. Using it on 1.8 V would result in permanent reset assertion.

What is the reset timeout duration of ADM1816-R23AKSZ-RL and how is it controlled?

The ADM1816-R23AKSZ-RL provides a fixed 150 ms typical reset timeout (100–250 ms range) after VCC rises above the 2.31 V threshold. This delay is internally generated and unadjustable-ensuring consistent power-on sequencing without external timing components, as documented in the "RESET ACTIVE TIME" row of Table 1.

Is ADM1816-R23AKSZ-RL RoHS compliant and what does the 'Z' suffix indicate?

Yes, ADM1816-R23AKSZ-RL is RoHS compliant. The 'Z' in the part number (per Ordering Guide footnote 2) explicitly denotes a lead-free, RoHS-compliant version. This is verified in the "ORDERING GUIDE" section (Page 9), where all -AKSZ- variants are marked "Z = RoHS Compliant Part".