Analog Devices Inc. ADM6315-31D3ARTRL7

Overview

ADM6315-31D3ARTRL7 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, 140 ms minimum reset timeout, 5 μA typical supply current, and reset assertion down to VCC > 1 V. It serves as a system-level power integrity guard in embedded controllers requiring reliable brownout detection and manual reset capability.

For engineers reviewing the ADM6315-31D3ARTRL7 datasheet, ADM6315-31D3ARTRL7 pinout, ADM6315-31D3ARTRL7 application, or ADM6315-31D3ARTRL7 equivalent, key selection criteria include trip point tolerance across temperature, open-drain output drive strength at low VCC, manual reset debounce timing, reset timeout stability over voltage transients, and compatibility with noisy automotive or industrial supply rails.

Technical Context

The ADM6315-31D3ARTRL7 implements a precision bandgap-based voltage reference comparator with internal hysteresis and temperature-compensated threshold (60 ppm/°C), enabling stable 3.08 V monitoring across −40°C to +125°C. Its reset logic asserts active-low output for ≥140 ms after VCC rises above threshold or MR deasserts.

It features a debounced manual reset input (1 μs minimum pulse width, 100 ns glitch rejection) and open-drain RESET output capable of sinking 3.2 mA at VCC > 4.25 V. The circuit operates down to VCC = 1 V and maintains reset assertion during fast supply drops (35 μs typical response at 1 mV/μs fall rate).

Key Specifications

Pinout & Package

ADM6315-31D3ARTRL7 is housed in a 4-lead SOT-143 surface-mount package (RA-4 outline), measuring 2.9 mm × 1.6 mm × 1.15 mm, optimized for space-constrained PCB layouts in portable and automotive electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US31D3+T and TPS3808G33DBVR, ADM6315-31D3ARTRL7 delivers tighter threshold accuracy over extended temperature, lower quiescent current, and native open-drain flexibility-making it optimal for high-reliability industrial and automotive applications where precise 3.08 V monitoring and mixed-rail interfacing are required.

Availability

ADM6315-31D3ARTRL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for ADM6315-31D3ARTRL7 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 microprocessor supervisory functions in harsh environments-delivering precision voltage monitoring, robust reset timing, and manual reset integration in minimal footprint packages.

FAQ

What is the exact reset threshold voltage and tolerance for ADM6315-31D3ARTRL7?

The ADM6315-31D3ARTRL7 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 confirmed in Table 1 of the Rev. I datasheet and applies directly to the ADM6315-31D3ARTRL7 variant per Table 5's trip point listing.

Does ADM6315-31D3ARTRL7 support operation below 2.5 V?

Yes, ADM6315-31D3ARTRL7 operates with VCC as low as 1 V and asserts reset down to that level. While its monitored threshold is fixed at 3.08 V, the internal circuitry remains functional and maintains reset assertion even when VCC drops below 2.5 V - a key feature documented in the "Operating Voltage" row of Table 1 and General Description section.

What is the function of Pin 3 (MR) on ADM6315-31D3ARTRL7, and how should it be used?

Pin 3 (MR) is a debounced active-low manual reset input on ADM6315-31D3ARTRL7. It accepts pulses ≥1 μs duration and rejects glitches <100 ns. When pulled low, it forces RESET output low regardless of VCC level. If unused, MR must be left floating - no external pull-up or pull-down is required, as confirmed in Table 4 and Functional Block Diagram description.

Is ADM6315-31D3ARTRL7 pin-compatible with ADM811?

Yes, ADM6315-31D3ARTRL7 is explicitly stated as pin-compatible with the ADM811 in the Features section of the datasheet. Both devices share identical 4-lead SOT-143 pinout (GND, RESET, MR, VCC) and compatible electrical behavior, enabling direct replacement in legacy designs without PCB modification.

What is the minimum reset timeout period for ADM6315-31D3ARTRL7, and how is it guaranteed?

The ADM6315-31D3ARTRL7 provides a minimum reset timeout period of 140 ms, as specified in Table 1 under "RESET ACTIVE TIMEOUT PERIOD" for the "ADM6315xxD3" variant and confirmed in Table 5. This value is guaranteed over −40°C to +85°C, with 112 ms minimum at −40°C to +125°C, ensuring reliable system initialization timing across full industrial temperature range.