Analog Devices Inc. ADM6315-45D2ART-RL

Overview

ADM6315-45D2ART-RL from Analog Devices is a precision open-drain microprocessor supervisory circuit in SOT-143 package, monitoring 4.50 V supply with ±2.5% threshold accuracy over −40°C to +85°C, 20 ms minimum reset timeout, 5 μA typical supply current, and reset assertion down to VCC > 1 V - used for reliable power-up/brownout detection in automotive safety systems.

For engineers reviewing the ADM6315-45D2ART-RL datasheet, ADM6315-45D2ART-RL pinout, ADM6315-45D2ART-RL application, or ADM6315-45D2ART-RL equivalent, key selection criteria include reset threshold tolerance, temperature range compliance, manual reset input behavior, open-drain output drive capability, and SOT-143 footprint compatibility with legacy ADM811 designs.

Technical Context

The ADM6315-45D2ART-RL implements a precision bandgap-based voltage reference comparator with built-in hysteresis and temperature-compensated trip point (60 ppm/°C), enabling accurate detection of 1.8% supply degradation. Its internal timing circuit generates a guaranteed minimum 20 ms reset pulse after VCC rises above 4.50 V or MR deasserts.

It features a debounced active-low manual reset input (MR) with 100 ns glitch rejection and ≥1 μs pulse acceptance, plus an open-drain RESET output capable of sinking 3.2 mA at VCC > 4.25 V - allowing direct interface with higher-voltage logic families without level-shifting.

Key Specifications

Pinout & Package

ADM6315-45D2ART-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 performance (θJA = 330°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM6315-45D2ART-RL, ADM811SARTZ-REEL7 offers longer reset timing but less precise threshold matching for 4.5 V rails, while TPS3808G18DBVR provides design flexibility at the cost of layout redesign and added BOM complexity.

Availability

ADM6315-45D2ART-RL is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, medical infusion pump controllers, and railway signaling interface boards requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM6315-45D2ART-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 power-supply monitoring in safety-critical embedded systems, emphasizing precision threshold stability, low-power operation, and noise-immune reset generation across −40°C to +125°C.

FAQ

What is the exact reset threshold voltage and tolerance for ADM6315-45D2ART-RL?

The ADM6315-45D2ART-RL has a nominal reset threshold of 4.50 V with ±2.5% tolerance over the −40°C to +85°C temperature range, and ±3.5% over −40°C to +125°C. This is specified in Table 1 of the Rev. I datasheet under "RESET VOLTAGE THRESHOLD (VTH)" and confirmed in Table 5's trip point listing. The device detects supply degradation as small as 1.8%, making ADM6315-45D2ART-RL suitable for high-integrity applications where marginal voltage excursions must trigger reset.

Does ADM6315-45D2ART-RL support manual reset functionality, and how is it implemented?

Yes, ADM6315-45D2ART-RL includes a dedicated active-low manual reset input (MR, Pin 3) with built-in debounce. It rejects glitches shorter than 100 ns and reliably accepts pulses ≥1 μs. An internal 63 kΩ pull-up holds MR high when unused. When pulled low - via switch, microcontroller GPIO, or logic signal - ADM6315-45D2ART-RL asserts RESET immediately and holds it for ≥20 ms after MR returns high. This behavior is documented in the "Manual Reset Input" section and Table 4.

What is the minimum VCC voltage at which ADM6315-45D2ART-RL can still assert RESET?

ADM6315-45D2ART-RL guarantees RESET assertion down to VCC > 1 V, as stated in the General Description and confirmed in the Absolute Maximum Ratings table. This enables fail-safe operation during severe brownout events where other supervisors may cease functioning. The open-drain RESET output remains functional with 80 μA sink capability even at VCC = 1 V, ensuring ADM6315-45D2ART-RL delivers actionable reset signals under worst-case supply collapse.

Is ADM6315-45D2ART-RL pin-compatible with the ADM811 series?

Yes, ADM6315-45D2ART-RL is explicitly pin-compatible with the ADM811 family, as noted in the Features section and Pin Configuration diagram. Both use identical 4-lead SOT-143 (RA-4) packaging and share GND, RESET, MR, and VCC pin assignments. However, ADM6315-45D2ART-RL offers tighter threshold accuracy (±2.5% vs. ±3.5% for ADM811), lower quiescent current (5 μA vs. ~10 μA), and improved temperature coefficient (60 ppm/°C), making ADM6315-45D2ART-RL a direct upgrade path.

What are the thermal characteristics and package dimensions of ADM6315-45D2ART-RL?

ADM6315-45D2ART-RL uses the RA-4 SOT-143 package with θJA = 330°C/W (worst-case surface-mount condition). Its outline dimensions are 2.9 mm × 1.6 mm × 1.15 mm, per the Package Drawing on page 8 of the datasheet. The device operates from −40°C to +125°C and stores from −65°C to +160°C. These specifications ensure ADM6315-45D2ART-RL meets under-hood automotive and industrial control requirements without derating.