Analog Devices Inc. ADM1815-5AKSZ-RL7

Overview

ADM1815-5AKSZ-RL7 from Analog Devices is an active-low, push-pull microprocessor reset circuit in SC70-3 package, monitoring 3.06 V (typ) supply voltage with 150 ms reset timeout, 9–16 µA supply current, and −40°C to +105°C operating range-used for safe power-up initialization in embedded controllers and industrial microprocessor systems.

For engineers reviewing the ADM1815-5AKSZ-RL7 datasheet, ADM1815-5AKSZ-RL7 pinout, ADM1815-5AKSZ-RL7 application, or ADM1815-5AKSZ-RL7 equivalent, key selection criteria include reset threshold accuracy (±1.5% typical), guaranteed reset assertion during brownout, push-pull output drive capability (350 µA source / 8 mA sink), and compatibility with standard microcontroller reset inputs without external components.

Technical Context

The ADM1815-5AKSZ-RL7 integrates a precision voltage reference, comparator, and 150 ms internal timer to ensure reliable power-on reset assertion until VCC stabilizes above 3.06 V (typ). Its active-low push-pull output directly interfaces with MCU reset pins requiring low-asserted reset signals.

It operates across full industrial temperature range (−40°C to +105°C) with supply voltage range of 1.2 V to 5.5 V and features low quiescent current (9 µA min at 3.6 V), enabling use in battery-backed and energy-sensitive applications where deterministic reset timing is critical.

Key Specifications

Pinout & Package

ADM1815-5AKSZ-RL7 is housed in a 3-lead SC70 (KS-3) package, measuring 2.00 mm × 2.10 mm × 0.95 mm, with gull-wing leads and JEDEC-compliant footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset applications.

Compared with ADM1815-5AKSZ-RL7, the SOT-23 variant offers identical functionality in a larger package, while the TPS3808G30DBVR trades push-pull simplicity for improved accuracy and broader supply range-making the ADM1815-5AKSZ-RL7 optimal for compact, cost-sensitive industrial designs needing guaranteed reset timing without external components.

Availability

ADM1815-5AKSZ-RL7 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical handheld devices requiring stable component supply with full RoHS compliance and extended temperature support.

Supply support for ADM1815-5AKSZ-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 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 designed specifically for robust, low-cost microprocessor reset supervision in space-constrained and thermally demanding applications-emphasizing precision threshold stability, guaranteed timing, and minimal external component count.

FAQ

What is the exact reset threshold voltage of the ADM1815-5AKSZ-RL7?

The ADM1815-5AKSZ-RL7 has a nominal reset threshold of 3.06 V, with a guaranteed range of 2.98 V (min) to 3.15 V (max) over −40°C to +105°C. This value is specified in Table 1 of the Rev. F datasheet and applies specifically to the -5 variant, confirming its suitability for monitoring 3.3 V supply rails with ±10% tolerance.

Does the ADM1815-5AKSZ-RL7 require an external pull-up resistor on the RST pin?

No, the ADM1815-5AKSZ-RL7 does not require an external pull-up resistor because it features an active-low push-pull output stage. The RST pin actively drives low during reset and high when released-unlike open-drain variants such as ADM1816-which eliminates the need for external components and ensures predictable timing behavior.

Can the ADM1815-5AKSZ-RL7 operate from a 2.5 V supply rail?

Yes, the ADM1815-5AKSZ-RL7 can monitor a 3.3 V rail while being powered from a 2.5 V supply, as its VCC operating range is 1.2 V to 5.5 V. However, its reset threshold remains fixed at 3.06 V-so it monitors the voltage applied to its VCC pin, not a separate rail. For true 2.5 V supply monitoring, ADM1815-20AKSZ-RL7 (2.55 V threshold) is the correct variant.

What is the reset timeout duration of the ADM1815-5AKSZ-RL7, and is it adjustable?

The ADM1815-5AKSZ-RL7 provides a fixed 150 ms typical reset timeout (100–250 ms min/max), measured from VCC rising above the threshold until RST deasserts. This delay is internally generated and non-adjustable-ensuring consistent, repeatable power-up sequencing without external timing components or configuration overhead.

Is the ADM1815-5AKSZ-RL7 RoHS compliant and lead-free?

Yes, the "Z" suffix in ADM1815-5AKSZ-RL7 explicitly denotes RoHS compliance and lead-free packaging per Analog Devices' ordering guide. It uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), making it suitable for standard reflow processes without special handling.