Analog Devices Inc. ADM6315-44D3ARTZR7

Overview

ADM6315-44D3ARTZR7 from Analog Devices is a precision open-drain microprocessor supervisory circuit designed to monitor 4.39 V supply rails with ±2.5% threshold accuracy over −40°C to +85°C, assert reset for ≥140 ms after power-up or brownout, and support manual reset via debounced MR input. It operates down to VCC > 1 V and consumes only 4–10 μA at 3.6 V, making it suitable for low-power embedded controllers and automotive safety modules.

For engineers reviewing the ADM6315-44D3ARTZR7 datasheet, ADM6315-44D3ARTZR7 pinout, ADM6315-44D3ARTZR7 application, or ADM6315-44D3ARTZR7 equivalent, key selection criteria include its 4.39 V trip point, 140 ms minimum reset timeout, SOT-143 package footprint, open-drain RESET output capable of sinking 3.2 mA at VCC > 4.25 V, and guaranteed glitch immunity against 100 ns transients on MR.

Technical Context

The ADM6315-44D3ARTZR7 implements a precision bandgap-based voltage reference comparator with temperature-compensated hysteresis (±2.5% over −40°C to +85°C) and internal timing capacitor for fixed 140 ms reset assertion. Its open-drain RESET output interfaces directly with higher-voltage logic families and supports wired-OR configurations.

It features a debounced manual reset input (MR) with 1 μs minimum pulse width acceptance and 100 ns transient rejection, plus power-down reset detection in 35 μs (VCC falling at 1 mV/μs). The device asserts reset whenever VCC drops below 4.39 V or MR is pulled low, holding RESET active for ≥140 ms after recovery.

Key Specifications

Pinout & Package

ADM6315-44D3ARTZR7 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 MAX6315US44D3+T and TPS3808G33DBVR, the ADM6315-44D3ARTZR7 provides native 4.39 V supervision with integrated MR debounce and open-drain flexibility-critical for automotive and safety-critical systems where direct compatibility and noise immunity are mandatory.

Availability

ADM6315-44D3ARTZR7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O subsystems, and medical infusion pump controllers requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.

Supply support for ADM6315-44D3ARTZR7 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 microprocessor supervision in harsh environments-delivering precision voltage monitoring, fast brownout response, and manual reset capability in space-constrained SOT-143 packages.

FAQ

What is the exact reset threshold voltage of the ADM6315-44D3ARTZR7?

The ADM6315-44D3ARTZR7 has a nominal reset threshold of 4.39 V, with tolerance of ±2.5% over the −40°C to +85°C temperature range and ±3.5% over −40°C to +125°C. This value is factory-trimmed and specified in Table 5 of the Rev. I datasheet; it corresponds to the "44" in the part number and is distinct from other variants like ADM6315-45D2ARTZR7 (4.50 V).

Does the ADM6315-44D3ARTZR7 require an external pull-up resistor on the RESET pin?

Yes, the ADM6315-44D3ARTZR7 features an open-drain RESET output and requires an external pull-up resistor to the target logic supply (e.g., 3.3 V or 5 V). The datasheet specifies that RESET sinks up to 3.2 mA at VCC > 4.25 V with ≤0.4 V drop, so a typical 4.7 kΩ pull-up to 3.3 V ensures valid logic-high levels while limiting current.

Can the ADM6315-44D3ARTZR7 operate with a supply voltage below 2.5 V?

Yes, the ADM6315-44D3ARTZR7 operates from VCC = 1 V to 5.5 V. Its reset function remains active down to VCC > 1 V, and it asserts RESET when VCC falls below 4.39 V-even during deep brownout. However, output drive strength degrades below 2.5 V (e.g., 0.3 V max drop at ISINK = 80 μA), so system-level logic compatibility must be verified.

What is the purpose of the MR pin on the ADM6315-44D3ARTZR7, and how should it be used?

The MR (Manual Reset) pin on the ADM6315-44D3ARTZR7 is an active-low, debounced input that forces RESET assertion when pulled low. It accepts pulses ≥1 μs wide and rejects transients <100 ns. When unused, MR must be left floating (internal 32–100 kΩ pull-up ensures high state); for switch-based reset, a simple SPST button to GND suffices without external components.

How does the 140 ms reset timeout of the ADM6315-44D3ARTZR7 behave during power-up versus brownout recovery?

During power-up, the ADM6315-44D3ARTZR7 asserts RESET for ≥140 ms after VCC rises above 4.39 V. During brownout recovery, RESET remains asserted for ≥140 ms after VCC crosses 4.39 V again-ensuring consistent timing regardless of fault origin. This fixed minimum timeout is guaranteed across −40°C to +125°C and is independent of VCC slew rate.