Analog Devices Inc. ADM6315-31D4ARTZR7

Overview

ADM6315-31D4ARTZR7 from Analog Devices is a precision open-drain microprocessor supervisory circuit designed to monitor 3.08 V supply rails with ±2.5% threshold accuracy over −40°C to +85°C, assert reset for ≥1120 ms after power-up or brownout, and support manual reset via debounced MR input - used in automotive safety systems, industrial controllers, and portable instrumentation.

For engineers reviewing the ADM6315-31D4ARTZR7 datasheet, ADM6315-31D4ARTZR7 pinout, ADM6315-31D4ARTZR7 application, or ADM6315-31D4ARTZR7 equivalent, key selection criteria include guaranteed 1120 ms minimum reset timeout, 3.08 V trip point with temperature-stable 60 ppm/°C coefficient, 5 μA typical supply current, and SOT-143 package compatibility with space-constrained embedded designs.

Technical Context

The ADM6315-31D4ARTZR7 implements a precision bandgap-based voltage comparator with internal hysteresis and a programmable reset timeout timer. Its reset assertion remains active for ≥1120 ms after VCC rises above 3.08 V or MR falls low, ensuring full system stabilization before processor release.

It features an open-drain RESET output capable of sinking 3.2 mA at VCC > 4.25 V, a debounced manual reset input rejecting <100 ns glitches, and operates down to VCC = 1 V while maintaining reset assertion - enabling reliable brownout detection in noisy, wide-temperature environments.

Key Specifications

Pinout & Package

ADM6315-31D4ARTZR7 is housed in a 4-lead SOT-143 surface-mount package (RA-4), measuring 2.9 mm × 1.6 mm × 1.1 mm, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US31D4+T and TPS3808G31DBVR, the ADM6315-31D4ARTZR7 uniquely combines open-drain RESET, 5 μA quiescent current, and SOT-143 footprint - making it optimal for legacy-compatible, multi-rail, and space-constrained industrial designs requiring proven thermal robustness.

Availability

ADM6315-31D4ARTZR7 is available at Aetrix Electronics and suitable for automotive safety systems, industrial PLC controllers, and smart energy meters requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for ADM6315-31D4ARTZR7 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 ADM6315 family was engineered specifically for reliable power-on reset and brownout protection in mission-critical embedded systems - emphasizing precision threshold accuracy, wide temperature operation, and low-power supervision.

FAQ

What is the exact reset threshold voltage of the ADM6315-31D4ARTZR7?

The ADM6315-31D4ARTZR7 has a nominal reset threshold of 3.08 V, with guaranteed accuracy of ±2.5% over −40°C to +85°C and ±3.5% over −40°C to +125°C. This value is factory-trimmed and specified in Table 1 of the Rev. I datasheet under "RESET VOLTAGE THRESHOLD (VTH)". The ADM6315-31D4ARTZR7 is part of the D4 timeout variant and is not interchangeable with other trip points like 2.63 V or 4.39 V.

Does the ADM6315-31D4ARTZR7 support manual reset, and how is it implemented?

Yes, the ADM6315-31D4ARTZR7 includes a dedicated MR (Manual Reset) pin (Pin 3) that is active-low and internally debounced. It rejects transients shorter than 100 ns and reliably detects pulses ≥1 μs. When MR is pulled low, RESET asserts immediately and remains low for the full 1120 ms timeout period. No external RC network is required - the debounce is fully integrated within the ADM6315-31D4ARTZR7.

What is the minimum supply voltage at which the ADM6315-31D4ARTZR7 can assert reset?

The ADM6315-31D4ARTZR7 asserts reset down to VCC > 1 V, as confirmed in the General Description and Absolute Maximum Ratings sections of the datasheet. This capability ensures reliable brownout detection even when the monitored supply collapses significantly below its nominal value - a critical feature for fail-safe operation in automotive and industrial systems where partial supply failure must trigger immediate reset.

Is the ADM6315-31D4ARTZR7 pin-compatible with the ADM811?

Yes, the ADM6315-31D4ARTZR7 is explicitly stated in the datasheet Features section as "Pin compatible with the ADM811". Both devices share identical SOT-143 pinout (GND, RESET, MR, VCC), same footprint, and compatible electrical behavior - enabling direct substitution in existing ADM811-based designs without PCB modification, provided the 1120 ms timeout and 3.08 V threshold meet system requirements.

What package type and dimensions does the ADM6315-31D4ARTZR7 use?

The ADM6315-31D4ARTZR7 uses the 4-lead SOT-143 package (Option RA-4), with body dimensions of 2.9 mm × 1.6 mm × 1.1 mm and standard lead pitch of 0.95 mm. This compact, surface-mount package is optimized for high-density layouts and is documented in the Outline Dimensions section (page 8) and Ordering Guide (page 8) of the Rev. I datasheet.