Analog Devices Inc. ADM6348-46ARTZ-R7

Overview

ADM6348-46ARTZ-R7 from Analog Devices is an ultralow-power, open-drain microprocessor reset circuit in a 3-lead SOT-23 package, designed to monitor 4.63 V supply rails with ±2.5% threshold accuracy over −40°C to +85°C, 100 ms minimum reset timeout, and 1 µA max supply current - used for reliable power-up/brownout reset assertion in portable microprocessor systems.

For engineers reviewing the ADM6348-46ARTZ-R7 datasheet, ADM6348-46ARTZ-R7 pinout, ADM6348-46ARTZ-R7 application, or ADM6348-46ARTZ-R7 equivalent, key selection criteria include open-drain reset output compatibility with bidirectional MCU reset pins, guaranteed RESET validity down to 1 V VCC, glitch immunity against negative-going transients, and SOT-23 footprint constraints in space-constrained designs.

Technical Context

The ADM6348-46ARTZ-R7 implements a precision voltage comparator with built-in hysteresis (9.5 mV) and a 100–280 ms reset timeout timer, ensuring deterministic reset assertion during power-up, brownout, and power-down events. Its internal reference is trimmed to deliver 4.63 V threshold with ±2.5% tolerance over full temperature range.

As an open-drain device, it requires an external pull-up resistor and interfaces directly with microprocessor reset inputs that support wired-OR logic or bidirectional control. RESET remains valid down to VCC = 1 V, enabling robust operation during deep undervoltage conditions.

Key Specifications

Pinout & Package

ADM6348-46ARTZ-R7 is housed in a JEDEC-compliant 3-lead SOT-23-3 (RT-3) package with 270°C/W junction-to-ambient thermal resistance, optimized for low-profile PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326TUT46+T and TPS3808G33DBVR, ADM6348-46ARTZ-R7 uniquely combines 4.63 V precision threshold, open-drain output, and 3-lead SOT-23 footprint - enabling direct drop-in replacement where bidirectional reset arbitration and minimal board area are mandatory.

Availability

ADM6348-46ARTZ-R7 is available at Aetrix Electronics and suitable for telecom power management, portable microcontroller systems, industrial edge node controllers, and notebook platform power sequencing requiring stable component supply and RoHS-compliant sourcing.

Supply support for ADM6348-46ARTZ-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 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 ADM63xx family delivers ultralow-power, precision voltage supervisors for microprocessor reset and supply monitoring in battery-powered and space-constrained applications - emphasizing accuracy, reliability, and minimal quiescent current.

FAQ

What is the exact reset threshold voltage of ADM6348-46ARTZ-R7 and how tightly is it specified?

The ADM6348-46ARTZ-R7 has a nominal reset threshold of 4.63 V, specified with ±2.5% tolerance over the full operating temperature range (−40°C to +85°C). At 25°C, the threshold is 4.63 V ±1.5%, and the device exhibits a temperature coefficient of 40 ppm/°C - ensuring predictable, low-drift performance without external calibration.

Does ADM6348-46ARTZ-R7 support operation below 2.0 V, and what happens to the RESET output at low VCC?

Yes, ADM6348-46ARTZ-R7 operates down to VCC = 1.0 V. The RESET output remains asserted (low) and electrically valid as long as VCC stays below 4.63 V, and continues to drive low with VOL ≤ 0.4 V at ISINK = 100 µA even at VCC = 1.2 V - enabling fail-safe reset assertion during deep brownout conditions.

What external components are required for proper operation of ADM6348-46ARTZ-R7?

ADM6348-46ARTZ-R7 requires only one external component: a pull-up resistor on the RESET pin (typically 4.7 kΩ to 10 kΩ connected to the monitored rail or logic supply). No capacitors, dividers, or additional logic are needed - the device integrates precision reference, comparator, hysteresis, and timing circuitry internally.

How does ADM6348-46ARTZ-R7 handle fast transients on the VCC line?

ADM6348-46ARTZ-R7 provides inherent glitch immunity against negative-going VCC transients up to 100 µs duration when overdriven by 200 mV below threshold (VTH − 200 mV), per Figure 5 in the datasheet. This prevents false resets caused by switching noise or coupling from adjacent DC-DC converters without requiring external filtering.

Is ADM6348-46ARTZ-R7 pin-compatible with other members of the ADM63xx family, such as ADM6328 or ADM6346?

Yes, ADM6348-46ARTZ-R7 shares identical 3-lead SOT-23 pinout (GND, RESET, VCC) and mechanical footprint with all ADM6326/ADM6328/ADM6346/ADM6348 variants. However, output structure differs: ADM6348-46ARTZ-R7 uses open-drain, while ADM6346-46ARTZ-R7 uses push-pull - requiring schematic review before substitution.