Analog Devices Inc. ADM6315-46D2ART-RL

Overview

ADM6315-46D2ART-RL from Analog Devices is a precision open-drain microprocessor supervisory circuit in 4-lead SOT-143 package, monitoring VCC at 4.63 V threshold with ±2.5% accuracy over −40°C to +85°C, 20 ms minimum reset timeout, and 5 μA typical supply current. It asserts active-low RESET during power-up, brownout, or manual reset, supporting safety-critical microprocessor systems.

For engineers reviewing the ADM6315-46D2ART-RL datasheet, ADM6315-46D2ART-RL pinout, ADM6315-46D2ART-RL application, or ADM6315-46D2ART-RL equivalent, key selection criteria include reset threshold tolerance, temperature range (−40°C to +125°C), manual reset input immunity (100 ns glitch rejection), open-drain output drive capability (3.2 mA sink at VCC > 4.25 V), and compatibility with 1 V minimum VCC operation.

Technical Context

The ADM6315-46D2ART-RL implements a precision bandgap-based voltage reference comparator with built-in hysteresis and temperature compensation (60 ppm/°C), enabling reliable detection of ≤1.8% supply degradation. Its internal timing circuit generates a fixed 20 ms minimum reset pulse after VCC rises above 4.63 V or MR returns high.

It features a debounced manual reset input (MR) with guaranteed 1 μs minimum pulse acceptance and 100 ns typical glitch rejection, plus an open-drain RESET output compatible with mixed-voltage systems-capable of sinking up to 3.2 mA while VCC ≥ 4.25 V or 80 μA down to VCC = 1 V.

Key Specifications

Pinout & Package

Package: 4-lead SOT-143 (RA-4), surface-mount, 1.3 mm × 2.1 mm footprint, θJA = 330°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US46D2+T and TPS3808G33DBVR, the ADM6315-46D2ART-RL offers superior thermal resistance in SOT-143, guaranteed 1 V operation, and true open-drain flexibility-making it optimal for high-reliability 5 V systems where layout and long-term stability outweigh minimal size savings.

Availability

ADM6315-46D2ART-RL is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, medical infusion pump controllers, and railway signaling interface boards requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ADM6315-46D2ART-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 designed specifically for robust power-supply supervision in mission-critical embedded systems-emphasizing precision threshold accuracy, wide temperature operation, and noise-immune manual reset functionality.

FAQ

What is the exact reset threshold voltage of the ADM6315-46D2ART-RL?

The ADM6315-46D2ART-RL has a nominal reset threshold of 4.63 V, with ±2.5% tolerance over the −40°C to +85°C temperature range and ±3.5% over −40°C to +125°C. This value is laser-trimmed at wafer test and specified in Table 1 of the Rev. I datasheet under "RESET VOLTAGE THRESHOLD (VTH)".

Does the ADM6315-46D2ART-RL support operation below 2.5 V VCC?

Yes, the ADM6315-46D2ART-RL asserts RESET down to VCC = 1 V and remains functional across its full 1 V to 5.5 V operating range. Its internal reference and comparator operate reliably at 1 V, enabling brownout detection well below standard logic thresholds-confirmed in the "Operating Voltage" specification (Table 1) and General Description section.

Is the RESET output of the ADM6315-46D2ART-RL push-pull or open-drain?

The RESET output of the ADM6315-46D2ART-RL is strictly open-drain, as stated in the Functional Block Diagram, Theory of Operation, and Pin Function Descriptions. It requires an external pull-up resistor to the target logic rail and can sink up to 3.2 mA when VCC > 4.25 V-enabling flexible voltage-level interfacing not possible with push-pull outputs.

Can the ADM6315-46D2ART-RL replace the ADM811 in existing designs?

Yes-the ADM6315-46D2ART-RL is explicitly pin-compatible with the ADM811 per the datasheet FEATURES section. Both use identical SOT-143 pinout (GND, RESET, MR, VCC), same electrical behavior, and share manual reset debounce and open-drain output architecture-allowing drop-in replacement without PCB modification.

What is the minimum pulse width required on the MR pin of the ADM6315-46D2ART-RL?

The MR pin of the ADM6315-46D2ART-RL requires a minimum negative-going pulse width of 1 μs to guarantee recognition, as specified in the "Manual Reset Input" section of the datasheet and Table 1 ("Minimum Input Pulse"). Pulses shorter than 100 ns are rejected; pulses ≥1 μs are accepted across full temperature range.