Analog Devices Inc. ADM6315-31D1ART-RL

Overview

ADM6315-31D1ART-RL from Analog Devices is a precision open-drain microprocessor supervisory circuit in SOT-143 package, monitoring 3.08 V supply with ±2.5% threshold accuracy over −40°C to +85°C, 1 ms minimum reset timeout, 5 μA typical supply current, and reset assertion down to VCC > 1 V. It serves as a system-level power-on/brownout detector in embedded controllers and safety-critical instrumentation.

For engineers reviewing the ADM6315-31D1ART-RL datasheet, ADM6315-31D1ART-RL pinout, ADM6315-31D1ART-RL application, or ADM6315-31D1ART-RL equivalent, key selection criteria include trip point tolerance, reset timeout stability across temperature, manual reset debounce timing, open-drain output drive capability at low VCC, and SOT-143 footprint compatibility with space-constrained PCB layouts.

Technical Context

The ADM6315-31D1ART-RL implements a precision bandgap-based voltage reference comparator with internal hysteresis and temperature-compensated threshold (60 ppm/°C), enabling reliable detection of ≤1.8% supply degradation. Its reset logic includes a fixed 1 ms timeout after VCC rise or MR deassertion, with guaranteed glitch rejection on the manual reset input (≥1 μs pulse width, 100 ns immunity).

Designed for direct integration into microprocessor reset chains, it features an open-drain RESET output capable of sinking 3.2 mA at VCC > 4.25 V and 80 μA down to VCC = 1 V, allowing level-shifting and wired-OR configurations with higher-voltage peripherals. The MR input supports both mechanical switch and digital logic interfaces with internal pull-up (32–100 kΩ) and debounced sampling.

Key Specifications

Pinout & Package

ADM6315-31D1ART-RL is housed in a 4-lead SOT-143 package (RA-4), measuring 2.9 mm × 1.6 mm × 1.15 mm, with gull-wing leads optimized for automated assembly and thermal dissipation (θJA = 330°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US31D1+T and TPS3808G31DBVR, the ADM6315-31D1ART-RL uniquely combines SOT-143 footprint compatibility with true open-drain output, sub-1 V reset assertion capability, and guaranteed 1 μs MR pulse acceptance-making it optimal for legacy-compatible, multi-rail, and safety-critical brownout recovery designs.

Availability

ADM6315-31D1ART-RL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitor sensors, and ruggedized handheld test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for ADM6315-31D1ART-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 was engineered specifically for robust, low-power microprocessor supervision in harsh environments-emphasizing precision threshold stability, wide VCC operating range, and integrated manual reset functionality without external components.

FAQ

What is the exact reset threshold voltage and tolerance for ADM6315-31D1ART-RL?

The ADM6315-31D1ART-RL has a nominal reset threshold of 3.08 V, with ±2.5% tolerance over the −40°C to +85°C temperature range and ±3.5% over −40°C to +125°C. This specification is guaranteed by design and verified per Analog Devices' production test flow, ensuring consistent brownout detection across operating conditions without calibration.

Does ADM6315-31D1ART-RL support reset assertion when VCC falls below 2.5 V?

Yes, ADM6315-31D1ART-RL asserts RESET down to VCC > 1 V, enabling reliable system shutdown even during severe brownout or battery depletion scenarios. Its internal reference and comparator remain functional below 2.5 V, unlike many supervisors that cease operation below their trip point.

Is the RESET output of ADM6315-31D1ART-RL push-pull or open-drain?

The RESET output of ADM6315-31D1ART-RL is strictly open-drain, requiring an external pull-up resistor to define the high logic level. This architecture supports wired-OR configurations, level shifting across voltage domains, and compatibility with multiple reset sources sharing a common reset bus.

What is the minimum pulse width required on the MR pin to trigger a reset with ADM6315-31D1ART-RL?

The MR input of ADM6315-31D1ART-RL requires a minimum negative-going pulse width of 1 μs to guarantee recognition. Pulses shorter than 100 ns are rejected as noise, providing inherent hardware debounce without external components-critical for noisy industrial or automotive environments.

Can ADM6315-31D1ART-RL operate across the full automotive temperature range?

Yes, ADM6315-31D1ART-RL is rated for operation from −40°C to +125°C, meeting AEC-Q100 stress test requirements for automotive body electronics. Its 60 ppm/°C threshold temperature coefficient and validated reset timing across this range make it suitable for under-hood and cabin control modules.