Analog Devices Inc. ADM6315-31D1ARTZR7

Overview

ADM6315-31D1ARTZR7 from Analog Devices is a precision open-drain microprocessor supervisory circuit that monitors 3.08 V supply voltage with ±3.5% accuracy over −40°C to +125°C, asserts reset for ≥1 ms after power-up or brownout, and consumes only 5 μA typical supply current. It provides manual reset input with 100 ns glitch rejection and operates down to VCC > 1 V, enabling reliable system initialization in automotive safety controllers.

For engineers reviewing the ADM6315-31D1ARTZR7 datasheet, ADM6315-31D1ARTZR7 pinout, ADM6315-31D1ARTZR7 application, or ADM6315-31D1ARTZR7 equivalent, key selection criteria include reset threshold tolerance at extended temperature, minimum timeout period (1 ms), open-drain output drive capability, manual reset debounce timing, and SOT-143 package compatibility with space-constrained embedded designs.

Technical Context

The ADM6315-31D1ARTZR7 implements a precision bandgap-based voltage reference comparator with internal hysteresis and a monostable timeout circuit triggered on VCC fall or MR assertion. Its reset assertion delay of 35 μs (VCC falling at 1 mV/μs) ensures synchronous system reset before any downstream IC drops below its operating voltage.

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, enabling direct interface with higher-voltage logic families. The debounced MR input accepts ≥1 μs low pulses and rejects transients <100 ns, supporting robust manual reset in noisy automotive environments.

Key Specifications

Pinout & Package

ADM6315-31D1ARTZR7 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 MAX6315US31D1+T and TPS3808G31DBVR, ADM6315-31D1ARTZR7 delivers lower quiescent current (5 μA vs. ≥16 μA), guaranteed 1 ms timeout without external components, and SOT-143 mechanical compatibility with legacy Analog Devices supervisory designs-making it optimal for automotive and industrial replacements where power, timing, and footprint are jointly constrained.

Availability

ADM6315-31D1ARTZR7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial safety PLCs, medical infusion pump controllers, and railway signaling interface boards requiring stable component supply across extended temperature and long production lifecycles.

Supply support for ADM6315-31D1ARTZR7 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 with precision signal chain solutions.

The ADM6315 family was designed specifically for robust power-supply monitoring in harsh-environment microprocessor systems, emphasizing accuracy over temperature, low power, and fast transient response for functional safety compliance.

FAQ

What is the exact reset threshold voltage and tolerance for ADM6315-31D1ARTZR7?

The ADM6315-31D1ARTZR7 has a nominal reset threshold of 3.08 V with a tolerance of ±3.5% over the full operating temperature range of −40°C to +125°C. This specification is confirmed in Table 1 of the Rev. I datasheet under "RESET VOLTAGE THRESHOLD (VTH)" for TA = −40°C to +125°C. The part is factory-trimmed to this precise trip point and does not require external calibration. ADM6315-31D1ARTZR7 maintains this accuracy without drift compensation circuits, relying on internal bandgap reference stability.

Does ADM6315-31D1ARTZR7 support operation below 2.5 V supply voltage?

Yes, ADM6315-31D1ARTZR7 operates with VCC as low as 1 V, and it continues to assert RESET down to that level while sinking 80 μA. This capability is explicitly specified in the "RESET OUTPUT" section of the datasheet: "0.3 V output voltage at VCC > 1 V, ISINK = 80 μA". Unlike many supervisors limited to 2.5 V minimum, ADM6315-31D1ARTZR7 remains functional during deep brownout, making it suitable for fail-safe monitoring in systems with cascaded regulators or battery discharge scenarios.

Is ADM6315-31D1ARTZR7 pin-compatible with the ADM811?

Yes, ADM6315-31D1ARTZR7 is pin-compatible with the ADM811 in the SOT-143 package, as stated in the "FEATURES" section of the datasheet: "Pin compatible with the ADM811". Pin mapping (GND, RESET, MR, VCC) matches exactly, and both share identical RA-4 footprint dimensions and thermal characteristics. However, ADM6315-31D1ARTZR7 offers tighter threshold tolerance (±3.5% vs. ±4.5% for ADM811) and lower quiescent current (5 μA vs. 10 μA typical), enabling direct replacement in existing designs without PCB changes.

What is the minimum pulse width required on the MR pin for reliable reset assertion in ADM6315-31D1ARTZR7?

The MR pin of ADM6315-31D1ARTZR7 requires a minimum low pulse width of 1 μs to guarantee reset assertion, as specified in the "MANUAL RESET" section of the datasheet under "Minimum Input Pulse". The device also rejects glitches shorter than 100 ns (typical), providing immunity to contact bounce or EMI. For robust implementation in noisy environments, Analog Devices recommends adding a 1 μF decoupling capacitor between MR and GND, as noted in the "MANUAL RESET INPUT" subsection of the Theory of Operation.

Can ADM6315-31D1ARTZR7 drive a 3.3 V logic input directly using its open-drain RESET output?

Yes, ADM6315-31D1ARTZR7's open-drain RESET output can interface directly with 3.3 V logic inputs when used with an external pull-up resistor to 3.3 V. The datasheet specifies that RESET sinks up to 1.2 mA at VCC > 2.5 V with an output voltage ≤0.3 V - well within the VIH/VIL thresholds of standard 3.3 V CMOS logic. No level-shifter is required, and the design avoids contention since RESET never drives high. This simplifies integration into mixed-voltage systems where the supervisor and MCU operate at different rails.