Analog Devices Inc. ADM6315-31D4ART-RL

Overview

ADM6315-31D4ART-RL from Analog Devices is a precision open-drain microprocessor supervisory circuit in SOT-143 package, monitoring 3.08 V supply with ±3.5% threshold accuracy over −40°C to +125°C, featuring 1120 ms minimum reset timeout, 5 μA typical supply current, and built-in debounced manual reset input. It ensures reliable power-up/brownout reset for embedded microcontroller systems.

For engineers reviewing the ADM6315-31D4ART-RL datasheet, ADM6315-31D4ART-RL pinout, ADM6315-31D4ART-RL application, or ADM6315-31D4ART-RL equivalent, key selection criteria include reset threshold tolerance at extended temperature, open-drain output drive capability into higher-voltage rails, manual reset glitch immunity, and compatibility with space-constrained SOT-143 layouts.

Technical Context

The ADM6315-31D4ART-RL implements a precision bandgap-based voltage reference comparator with internal hysteresis and temperature-compensated trip point (60 ppm/°C), enabling stable 3.08 V monitoring across automotive-grade temperature range. Its reset assertion occurs within 35 μs during VCC fall at 1 mV/μs, and deassertion includes fixed 1120 ms minimum timeout after VCC recovery.

It features an open-drain RESET output capable of sinking 3.2 mA at VCC > 4.25 V, supporting level-shifted interfacing to logic families operating above its VCC rail. The MR input accepts ≥1 μs low pulses, rejects <100 ns glitches, and includes internal pull-up (32–100 kΩ), eliminating external components in most manual reset implementations.

Key Specifications

Pinout & Package

Package: 4-Lead SOT-143 (RA-4), surface-mount, 1.2 mm × 2.1 mm footprint, 0.95 mm height, thermal resistance θJA = 330°C/W.

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 ADM6315-31D4ART-RL offers superior thermal stability (±3.5% over −40°C to +125°C vs. ±4.5% for MAX6315), guaranteed open-drain interoperability with mixed-voltage systems, and lower max ICC at high temperature-making it optimal for automotive and industrial applications demanding robustness and interface flexibility.

Availability

ADM6315-31D4ART-RL is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC mainboards, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM6315-31D4ART-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 ADM6315 family delivers precision, low-power, temperature-stable voltage supervision for mission-critical embedded systems where deterministic reset behavior under brownout and cold-start conditions is non-negotiable.

FAQ

What is the exact reset threshold voltage and tolerance for ADM6315-31D4ART-RL?

The ADM6315-31D4ART-RL has a nominal reset threshold of 3.08 V, with a maximum deviation of ±3.5% over the full operating temperature range of −40°C to +125°C. This specification is verified per Table 1 in the Rev. I datasheet and ensures reliable detection of supply degradation before downstream logic fails. The ADM6315-31D4ART-RL uses an internal bandgap reference with 60 ppm/°C temperature coefficient to maintain this accuracy.

Does ADM6315-31D4ART-RL support manual reset, and how is it implemented?

Yes, the ADM6315-31D4ART-RL includes a dedicated MR (manual reset) pin (Pin 3) that accepts active-low signals. It features internal debouncing with guaranteed acceptance of ≥1 μs pulses and rejection of <100 ns glitches. The MR input has an internal pull-up resistor (32–100 kΩ), so it remains inactive when left floating. This design eliminates external components for basic pushbutton reset functionality in the ADM6315-31D4ART-RL.

What is the RESET output type of ADM6315-31D4ART-RL, and why does it matter?

The ADM6315-31D4ART-RL features an open-drain RESET output (Pin 2), which requires an external pull-up resistor to the target logic rail. This architecture enables wired-OR configuration with other reset sources and allows interfacing with logic families operating at voltages higher than the ADM6315-31D4ART-RL's VCC (e.g., 5 V MCU I/O while VCC = 3.3 V). It is essential for flexible system-level reset arbitration.

What is the minimum reset timeout period for ADM6315-31D4ART-RL, and how is it guaranteed?

The ADM6315-31D4ART-RL provides a minimum reset timeout period of 1120 ms after VCC rises above the 3.08 V threshold and MR is released. This value is specified in Table 1 under "ADM6315xxD4" at −40°C to +85°C (1120–2240 ms) and −40°C to +125°C (896–2688 ms). The lower bound (1120 ms) is production-tested and guaranteed, ensuring sufficient hold time for full system stabilization in the ADM6315-31D4ART-RL.

Is ADM6315-31D4ART-RL compatible with the ADM811, and what does that mean for design reuse?

Yes, the ADM6315-31D4ART-RL is explicitly stated as pin-compatible with the ADM811 in the datasheet Features section. Both share identical SOT-143 pinout (GND, RESET, MR, VCC), same functional behavior, and overlapping voltage thresholds. This allows drop-in replacement in legacy designs using ADM811, preserving PCB layout and bill-of-materials while upgrading to the ADM6315-31D4ART-RL's improved temperature range and tighter threshold tolerance.