Analog Devices Inc. ADM6348-37ARTZ-R7

Overview

ADM6348-37ARTZ-R7 from Analog Devices is an ultralow-power, open-drain microprocessor reset circuit in a 3-lead SOT-23 package, designed to monitor 3.7 V supply rails with ±2.5% threshold accuracy over −40°C to +85°C. It asserts an active-low RESET signal within 20 µs of VCC falling below 3.7 V, holds reset for ≥100 ms on power-up, and remains functional down to VCC = 1 V - enabling reliable startup and brownout protection in portable microprocessor systems.

For engineers reviewing the ADM6348-37ARTZ-R7 datasheet, ADM6348-37ARTZ-R7 pinout, ADM6348-37ARTZ-R7 application, or ADM6348-37ARTZ-R7 equivalent, key selection criteria include its 3.7 V reset threshold, 1 µA max supply current at 3.3 V, open-drain output requiring external pull-up, 100 ms minimum reset timeout, and guaranteed operation down to 1 V supply - all critical for low-power embedded reset supervision.

Technical Context

The ADM6348-37ARTZ-R7 implements a precision bandgap-based voltage comparator with built-in hysteresis (9.5 mV) and a 100 ms–280 ms internal reset timeout timer. Its open-drain RESET output interfaces directly with bidirectional microprocessor reset pins and requires only one external pull-up resistor.

It features glitch immunity against negative-going VCC transients up to 200 mV overdrive, with transient rejection validated across pulse durations up to 700 µs. The device operates across the full industrial temperature range (−40°C to +85°C) and maintains reset assertion until VCC rises above 3.7 V + hysteresis.

Key Specifications

Pinout & Package

ADM6348-37ARTZ-R7 is housed in a JEDEC-compliant 3-lead SOT-23-3 (RT-3) package with 270°C/W junction-to-ambient thermal resistance. Pin 1 is GND, Pin 2 is RESET (open-drain active-low output), and Pin 3 is VCC (monitored supply input).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset supervision applications.

Compared with MAX6326–T37 and TPS3808G33DBVR, the ADM6348-37ARTZ-R7 uniquely combines 3.7 V precision, open-drain output, 1 µA supply current, and 3-lead SOT-23 packaging - making it optimal for space- and power-constrained designs requiring exact 3.7 V rail supervision without layout or BOM overhead.

Availability

ADM6348-37ARTZ-R7 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, wireless sensor nodes, and point-of-sale terminals requiring stable component supply and long-term lifecycle support.

Supply support for ADM6348-37ARTZ-R7 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and consumer markets since 1965.

The ADM63xx family delivers ultralow-power, precision voltage supervision for microprocessor-based systems - engineered specifically for battery-operated, space-constrained, and thermally demanding embedded applications.

FAQ

What is the exact reset threshold voltage of the ADM6348-37ARTZ-R7, and how tightly is it specified?

The ADM6348-37ARTZ-R7 has a nominal reset threshold of 3.7 V at 25°C, with a guaranteed tolerance of ±2.5% over the full operating temperature range (−40°C to +85°C). At 25°C, the threshold is specified as 3.644 V (min) to 3.755 V (max); over temperature, it extends to 3.607 V (min) to 3.792 V (max). This precision eliminates need for external calibration in 3.7 V rail monitoring.

Does the ADM6348-37ARTZ-R7 require an external pull-up resistor, and why?

Yes, the ADM6348-37ARTZ-R7 requires an external pull-up resistor on its open-drain RESET pin because its output stage lacks an internal pull-up. This design enables wired-OR reset bus configurations and compatibility with bidirectional microprocessor reset inputs. A typical value is 10 kΩ to the monitored VCC rail or a higher logic rail, ensuring proper logic-high level when RESET is deasserted.

Can the ADM6348-37ARTZ-R7 operate reliably when the supply voltage drops below 2.0 V?

Yes, the ADM6348-37ARTZ-R7 is fully functional down to VCC = 1.0 V, guaranteeing correct reset assertion and timing behavior even during deep brownout conditions. Its internal circuitry remains active and the RESET output stays asserted until VCC rises above the 3.7 V threshold plus hysteresis - a critical capability for fail-safe operation in battery-depleted scenarios.

What is the reset timeout period of the ADM6348-37ARTZ-R7, and is it adjustable?

The ADM6348-37ARTZ-R7 has a fixed internal reset timeout period of 100 ms minimum, 185 ms typical, and 280 ms maximum after VCC rises above the reset threshold. This timeout is factory-programmed and non-adjustable - ensuring consistent, predictable power-up sequencing without external RC components or configuration overhead.

How does the ADM6348-37ARTZ-R7 handle fast voltage transients on the VCC line?

The ADM6348-37ARTZ-R7 incorporates built-in glitch immunity that rejects negative-going VCC transients up to 200 mV in magnitude and 700 µs in duration without asserting reset. This is achieved through internal filtering and comparator overdrive design, preventing false resets caused by switching noise, load dumps, or ESD-induced supply disturbances in electrically harsh environments.