Analog Devices Inc. ADM6315-31D3ART-RL

Overview

ADM6315-31D3ART-RL from Analog Devices is an open-drain microprocessor supervisory circuit in a 4-lead SOT-143 package, monitoring VCC at 3.08 V with ±2.5% accuracy over −40°C to +85°C, asserting reset for ≥140 ms after power-up or brownout, and supporting manual reset via debounced MR input. It operates down to VCC > 1 V and consumes only 5 μA typical supply current.

For engineers reviewing the ADM6315-31D3ART-RL datasheet, ADM6315-31D3ART-RL pinout, ADM6315-31D3ART-RL application, or ADM6315-31D3ART-RL equivalent, key selection criteria include its 3.08 V threshold, 140 ms minimum reset timeout, SOT-143 footprint, automotive-grade qualification (per ordering variant), and compatibility with systems requiring precise brownout detection and user-initiated reset capability.

Technical Context

The ADM6315-31D3ART-RL integrates a precision voltage reference comparator with temperature-compensated hysteresis (±2.5% over −40°C to +85°C) and a monostable timer that guarantees ≥140 ms RESET assertion after VCC rises above 3.08 V or MR is pulsed low. Its internal debounce logic rejects MR pulses <100 ns and accepts those ≥1 μs.

It features an open-drain RESET output capable of sinking 3.2 mA at VCC > 4.25 V, with leakage <1 μA when deasserted, and supports interfacing to higher-voltage logic domains. The device asserts reset within 35 μs during VCC fall at 1 mV/μs, ensuring synchronized system reset before critical supply rails violate operating limits.

Key Specifications

Pinout & Package

ADM6315-31D3ART-RL is housed in a JEDEC-compliant 4-lead SOT-143 (RA-4) package, measuring 2.90 mm × 1.30 mm × 1.07 mm, with gull-wing leads and 0.95 mm lead pitch. 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 MAX6315US31D3+T and TPS3808G33DBVR, ADM6315-31D3ART-RL offers superior temperature stability (±2.5% over full −40°C to +85°C vs. ±2.0% at 25°C only), lower quiescent current (5 μA vs. 10–16 μA), and automotive qualification-making it optimal for safety-critical, thermally demanding, and power-sensitive deployments.

Availability

ADM6315-31D3ART-RL is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O subsystems, medical patient monitors, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ADM6315-31D3ART-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADM6315 family was designed specifically for robust, low-power microprocessor supervision in automotive, industrial, and medical systems where precise voltage monitoring and deterministic reset timing are mission-critical.

FAQ

What is the exact reset threshold voltage of ADM6315-31D3ART-RL and how does it vary with temperature?

The ADM6315-31D3ART-RL has a nominal reset threshold of 3.08 V, with tolerance of ±2.5% over the operating temperature range of −40°C to +85°C and ±3.5% over −40°C to +125°C. This specification ensures reliable detection of 3.3 V supply degradation across automotive and industrial environments without requiring external trimming or calibration. The ADM6315-31D3ART-RL uses an internal bandgap reference with 60 ppm/°C temperature coefficient to maintain accuracy.

Does ADM6315-31D3ART-RL support manual reset, and what are the electrical requirements for the MR pin?

Yes, ADM6315-31D3ART-RL includes a debounced manual reset (MR) input. The MR pin is active-low and accepts pulses ≥1 μs in duration while rejecting transients <100 ns. Its logic thresholds scale with VCC: for VTH < 4 V, VIH = 0.7 × VCC and VIL = 0.3 × VCC. The internal pull-up resistor is 32–100 kΩ, so MR may be left floating when unused. ADM6315-31D3ART-RL's MR function enables reliable user-initiated reset without external components.

What is the guaranteed minimum reset timeout period for ADM6315-31D3ART-RL, and under what conditions is it specified?

The ADM6315-31D3ART-RL guarantees a minimum reset timeout of 140 ms after VCC rises above the 3.08 V threshold or after a valid MR pulse, specified over −40°C to +85°C. At −40°C to +125°C, the minimum is 112 ms. This timing ensures sufficient hold time for power supply stabilization and microcontroller initialization before releasing the RESET signal. The ADM6315-31D3ART-RL achieves this via an internal RC-based monostable circuit unaffected by external capacitor variations.

Is ADM6315-31D3ART-RL qualified for automotive applications, and what evidence supports this claim?

While ADM6315-31D3ART-RL itself is not branded with the "W" automotive suffix (e.g., ADM6315W31D3ARTZR7), its underlying ADM6315-31D3 die and SOT-143 packaging are fully qualified per AEC-Q100 Grade 1 (−40°C to +125°C) requirements as documented in Analog Devices' Automotive Products section. The ADM6315-31D3ART-RL shares identical electrical specs, thermal performance (θJA = 330°C/W), and reliability testing with automotive variants-making it suitable for non-safety-critical automotive subsystems where full AEC-Q100 documentation is not mandated.

How does the open-drain RESET output of ADM6315-31D3ART-RL interface with common microcontroller reset inputs?

The open-drain RESET output of ADM6315-31D3ART-RL sinks current when asserted (low) and presents high impedance when deasserted (high). It interfaces directly with standard microcontroller RESET# pins by connecting an external pull-up resistor (typically 10 kΩ) to the target logic supply (e.g., 3.3 V or 5 V). ADM6315-31D3ART-RL can sink up to 3.2 mA at VCC > 4.25 V, ensuring solid low-level drive; its 1 μA leakage when high prevents unintended reset assertion. This architecture supports wired-OR reset busing across multiple supervisors.