Analog Devices Inc. ADM1816-20AKS-RL7

Overview

ADM1816-20AKS-RL7 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 2.55 V typical reset threshold, 150 ms reset timeout, −40°C to +105°C operating range, and SC70 package. Used in embedded controllers to ensure safe power-on initialization.

For engineers reviewing the ADM1816-20AKS-RL7 datasheet, ADM1816-20AKS-RL7 pinout, ADM1816-20AKS-RL7 application, or ADM1816-20AKS-RL7 equivalent, key selection criteria include trip point accuracy (±2.5% over temperature), low quiescent current (≤10 µA at 3.6 V), open-drain output compatibility with I²C-bus logic levels, and push-button reset support in related variants.

Technical Context

The ADM1816-20AKS-RL7 implements a precision voltage comparator with built-in hysteresis and a fixed 150 ms power-up delay timer. Its internal reference achieves ±2.5% trip point tolerance across −40°C to +105°C, and the open-drain RST output includes a 3.5–7.5 kΩ internal pull-up resistor.

This device belongs to the ADM181x family of supervisory circuits optimized for space-constrained applications requiring reliable reset assertion during brownout or startup. It operates from 1.2 V to 5.5 V supply and draws only 4–10 µA, enabling use in battery-backed systems.

Key Specifications

Pinout & Package

ADM1816-20AKS-RL7 is housed in a 3-lead SC70 (KS-3) package - 2.0 mm × 1.25 mm × 0.9 mm body, 0.65 mm lead pitch - optimized for automated assembly and thermal performance (θ_JA = 146°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–25D2T and TPS3808G125DBVR, ADM1816-20AKS-RL7 offers integrated pull-up, tighter trip tolerance (±2.5% vs. ±3.5%), smaller SC70 footprint, and lower 4 µA supply current - making it optimal for compact, low-power industrial controllers where BOM reduction and thermal robustness are critical.

Availability

ADM1816-20AKS-RL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitors, and smart energy meters requiring stable component supply with guaranteed long-term availability.

Supply support for ADM1816-20AKS-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 product line delivers cost-effective, space-efficient voltage supervisors targeting microprocessor reset functionality in industrial, automotive, and medical systems where reliability and small form factor are essential.

FAQ

What is the exact reset threshold voltage of ADM1816-20AKS-RL7?

The ADM1816-20AKS-RL7 has a typical reset threshold of 2.55 V, 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 under "VCC TRIP POINT" for model ADM1816-20. The "-20" suffix explicitly denotes the 2.55 V nominal trip point variant.

Does ADM1816-20AKS-RL7 support manual reset via push-button?

No, ADM1816-20AKS-RL7 does not support manual push-button reset. That function is exclusive to the ADM1813 and ADM1818 variants (e.g., ADM1818-20AKSZ-RL7). ADM1816-20AKS-RL7 provides only power-supply monitoring and automatic reset assertion; its RST pin is open-drain and intended solely for connection to a microcontroller's reset input.

What package type and dimensions does ADM1816-20AKS-RL7 use?

ADM1816-20AKS-RL7 uses the SC70-3 (KS-3) package: 2.00 mm × 1.25 mm × 0.90 mm body size, 0.65 mm lead pitch, and JEDEC-compliant outline per Figure 16. This 3-lead surface-mount package is distinct from the SOT-23 option used by other ADM181x variants and enables higher PCB density.

Can ADM1816-20AKS-RL7 operate with a 1.8 V supply rail?

No, ADM1816-20AKS-RL7 cannot monitor a 1.8 V rail because its 2.55 V threshold exceeds that voltage. However, it can be powered *from* a 1.8 V supply only if that supply meets the device's minimum V_CC requirement of 1.2 V - but doing so would prevent meaningful supervision of the 1.8 V rail itself. For 1.8 V monitoring, a dedicated 1.8 V supervisor such as ADM1815-R18 is required.

Is the internal pull-up resistor in ADM1816-20AKS-RL7 sufficient for driving a standard ARM Cortex-M reset input?

Yes, the internal 3.5–7.5 kΩ pull-up resistor in ADM1816-20AKS-RL7 is sufficient for driving typical ARM Cortex-M reset inputs, which require ≤100 µA leakage and accept 0.7×V_DD as logic high. At 3.3 V, the internal pull-up delivers ~440 µA sink current capability (per Table 1 RST Sink Current spec), well above the 10–50 µA typical MCU input leakage, eliminating need for external components in most designs.