Analog Devices Inc. ADM6315W31D2ARTZR7

Overview

ADM6315W31D2ARTZR7 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, 20 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 requiring reliable reset sequencing.

For engineers reviewing the ADM6315W31D2ARTZR7 datasheet, ADM6315W31D2ARTZR7 pinout, ADM6315W31D2ARTZR7 application, or ADM6315W31D2ARTZR7 equivalent, key selection criteria include trip point tolerance, temperature range (−40°C to +125°C), manual reset input compatibility, open-drain output drive capability, and SOT-143 footprint constraints.

Technical Context

The ADM6315W31D2ARTZR7 integrates a precision voltage reference comparator with hysteresis, debounced manual reset input (MR), and open-drain RESET output. Its internal threshold is trimmed to 3.08 V with ±2.5% variation across −40°C to +85°C and ±3.5% up to +125°C.

It delivers 20 ms minimum reset timeout after VCC rise or MR release, supports reset assertion during brownout (35 μs response at 1 mV/μs fall rate), and operates with supply current as low as 4 μA at 3.6 V - enabling use in battery-backed and low-power industrial systems.

Key Specifications

Pinout & Package

ADM6315W31D2ARTZR7 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 MAX6315US31D2+T and TPS3808G33DBVR, ADM6315W31D2ARTZR7 offers superior threshold accuracy at temperature, lower quiescent current, true 1 V operational floor, and integrated debounced MR - making it optimal for safety-critical and energy-constrained deployments where precise 3.08 V monitoring is mandatory.

Availability

ADM6315W31D2ARTZR7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical infusion pumps requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.

Supply support for ADM6315W31D2ARTZR7 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 developed to deliver precision, low-power, and temperature-stable reset supervision for microprocessor-based systems where supply integrity directly impacts functional safety and data reliability.

FAQ

What is the exact reset threshold voltage of ADM6315W31D2ARTZR7 and how does it vary with temperature?

The ADM6315W31D2ARTZR7 has a nominal reset threshold of 3.08 V. At 25°C, tolerance is ±1.8%; over −40°C to +85°C, it widens to ±2.5%; and up to +125°C, it is ±3.5%. This is specified in Table 1 of the datasheet and verified across production lots. The ADM6315W31D2ARTZR7 uses laser-trimmed on-chip references to achieve this stability without external components.

Does ADM6315W31D2ARTZR7 support manual reset, and what are the electrical requirements for the MR pin?

Yes, ADM6315W31D2ARTZR7 includes a debounced manual reset (MR) input. It accepts pulses ≥1 μs wide and rejects glitches <100 ns. Logic low is defined as <0.3×VCC (if VTH < 4 V) or <0.8 V (if VTH > 4 V); logic high is >0.7×VCC or >2.4 V. The MR pin has an internal 63 kΩ pull-up, so it may be left floating when unused - no external resistor is required for basic operation.

What is the minimum VCC voltage at which ADM6315W31D2ARTZR7 can assert RESET?

ADM6315W31D2ARTZR7 asserts RESET down to VCC > 1 V, as stated in the General Description and confirmed in Absolute Maximum Ratings. This enables fail-safe reset generation even during severe brownout conditions where other supervisory circuits would cease operation. The ADM6315W31D2ARTZR7 remains functional and drives RESET low as long as VCC exceeds 1 V, regardless of whether the monitored supply is 3.3 V or 5 V.

Is ADM6315W31D2ARTZR7 pin-compatible with the ADM811, and what are the implications for design reuse?

Yes, ADM6315W31D2ARTZR7 is explicitly stated as pin-compatible with the ADM811 in the datasheet Features section. Both use identical SOT-143 pinout (GND, RESET, MR, VCC) and share compatible voltage thresholds and timing behavior. However, ADM6315W31D2ARTZR7 offers tighter threshold accuracy, lower supply current, and extended temperature range - allowing drop-in replacement in legacy ADM811 designs without layout changes.

What package type and RoHS status does ADM6315W31D2ARTZR7 have?

ADM6315W31D2ARTZR7 is supplied in a 4-lead SOT-143 package (RA-4 option), with lead-free (Pb-free) construction and RoHS compliance indicated by the "Z" suffix per the Ordering Guide. The device meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.