Analog Devices Inc. ADM1816-20AKSZ-RL

Overview

ADM1816-20AKSZ-RL from Analog Devices is a low-power, open-drain microprocessor reset circuit with internal pull-up resistor, designed to monitor 2.5 V supplies and assert an active-low reset signal when VCC falls below 2.55 V (typical). It provides 150 ms reset timeout after power-up, operates across −40°C to +105°C, and is housed in a RoHS-compliant 3-lead SC70 package. It ensures safe system initialization in embedded controllers and industrial microprocessor systems.

For engineers reviewing the ADM1816-20AKSZ-RL datasheet, ADM1816-20AKSZ-RL pinout, ADM1816-20AKSZ-RL application, or ADM1816-20AKSZ-RL equivalent, key selection considerations include its 2.55 V trip point, open-drain output with 5.5 kΩ internal pull-up, 150 ms reset timeout, −40°C to +105°C operating range, and SC70 package compatibility with space-constrained PCB layouts.

Technical Context

The ADM1816-20AKSZ-RL uses a precision bandgap reference and comparator to detect supply voltage drops below its 2.55 V (typical) threshold, with ±1.5% accuracy over temperature. Its internal 5.5 kΩ pull-up resistor eliminates external components for open-drain reset signaling.

It incorporates a fixed 150 ms (typical) reset timeout after VCC rises above threshold, ensuring stable power delivery before system release. The device draws only 4 µA at 3.6 V and supports sink currents up to 8 mA on the RST pin, enabling direct interface with standard microprocessor reset inputs.

Key Specifications

Pinout & Package

ADM1816-20AKSZ-RL is supplied in a 3-lead SC70 (KS-3) package, measuring 2.00 mm × 1.25 mm × 0.95 mm, with gull-wing leads and JEDEC SC70 compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–25D2T+ and TPS3808G12DBVR, ADM1816-20AKSZ-RL uniquely integrates the pull-up resistor and matches SC70 footprint-reducing component count and preserving layout reuse-while delivering identical 2.55 V supervision accuracy and 150 ms timeout for drop-in replacement in space-constrained industrial designs.

Availability

ADM1816-20AKSZ-RL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical handheld diagnostics, and smart energy meters requiring stable component supply, extended temperature operation, and RoHS-compliant packaging.

Supply support for ADM1816-20AKSZ-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 since 1965.

The ADM181x series was developed specifically for cost-sensitive, space-constrained microprocessor reset supervision in industrial and automotive applications-emphasizing low quiescent current, integrated pull-up, and wide-temperature reliability without external timing components.

FAQ

What is the exact reset threshold voltage of ADM1816-20AKSZ-RL?

The ADM1816-20AKSZ-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. This value is specified in Table 1 of the Rev. F datasheet and applies directly to the ADM1816-20AKSZ-RL variant, confirming its suitability for supervising 2.5 V supply rails with appropriate margin.

Does ADM1816-20AKSZ-RL require an external pull-up resistor?

No, ADM1816-20AKSZ-RL does not require an external pull-up resistor. It features an integrated 5.5 kΩ (typical) internal pull-up resistor on the RST pin, as confirmed in Table 1 under "INTERNAL PULL-UP RESISTOR" for ADM1816 devices. This eliminates the need for external components and simplifies PCB layout for ADM1816-20AKSZ-RL implementations.

What is the reset timeout duration of ADM1816-20AKSZ-RL after power-up?

The ADM1816-20AKSZ-RL asserts reset for 150 ms (typical) after VCC rises above the threshold, with a guaranteed range of 100 ms (min) to 250 ms (max). This fixed delay is inherent to the device architecture and is documented in the "RESET ACTIVE TIME" row of Table 1, ensuring reliable microprocessor initialization timing for ADM1816-20AKSZ-RL.

Which package type is used by ADM1816-20AKSZ-RL?

ADM1816-20AKSZ-RL uses the 3-lead SC70 (KS-3) package, as indicated by the "KS-3 (SC70)" entry in the Ordering Guide on page 9 of the Rev. F datasheet. The "Z" suffix confirms RoHS compliance, and mechanical dimensions are provided in Figure 16, confirming a 2.00 mm × 1.25 mm footprint compatible with fine-pitch automated assembly.

Can ADM1816-20AKSZ-RL be used to monitor voltages other than 2.5 V?

ADM1816-20AKSZ-RL is optimized for 2.5 V supply monitoring, but its 1.2 V to 5.5 V supply range allows operation from auxiliary rails. To supervise higher voltages (e.g., 3.3 V or 5 V), an external resistor divider must be used at VCC-though this introduces accuracy loss and temperature drift not compensated by ADM1816-20AKSZ-RL's internal reference.