Analog Devices Inc. ADM6348-40ARTZ-R7

Overview

ADM6348-40ARTZ-R7 from Analog Devices is an ultralow-power, open-drain microprocessor reset circuit in a 3-lead SOT-23 package, designed to monitor 4.0 V supply rails with ±2.5% threshold accuracy over −40°C to +85°C. It asserts active-low RESET within 20 µs of VCC falling below 4.0 V and holds it for ≥100 ms on power-up, supporting reliable boot sequencing in portable and telecom systems.

For engineers reviewing the ADM6348-40ARTZ-R7 datasheet, ADM6348-40ARTZ-R7 pinout, ADM6348-40ARTZ-R7 application, or ADM6348-40ARTZ-R7 equivalent, key selection criteria include its 1 µA max supply current, 4.0 V reset threshold with 9.5 mV hysteresis, open-drain output requiring external pull-up, and guaranteed operation down to VCC = 1 V - critical for battery-powered brownout detection and bidirectional reset interfacing.

Technical Context

The ADM6348-40ARTZ-R7 implements a precision voltage comparator with internal reference and glitch-immune timing logic to detect VCC drops below 4.0 V (±2.5% over temperature). Its open-drain RESET output interfaces directly with microprocessor bidirectional reset pins using a single external pull-up resistor.

It features a fixed 100–280 ms reset timeout period, operates from 1.0 V to 5.5 V supply, and maintains valid RESET assertion down to VCC = 1 V. Temperature coefficient is 40 ppm/°C, and hysteresis is 9.5 mV - optimized for stable monitoring of 3.3 V–4.63 V rails in extended industrial environments.

Key Specifications

Pinout & Package

ADM6348-40ARTZ-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), and Pin 3 is VCC - compatible with standard SOT-23 pick-and-place and reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326T40D2-T and TPS3808G33DBVR, the ADM6348-40ARTZ-R7 uniquely combines precise 4.0 V monitoring, open-drain output, and sub-µA quiescent current in a 3-pin SOT-23 - making it optimal for space-constrained, battery-sensitive designs requiring shared reset arbitration.

Availability

ADM6348-40ARTZ-R7 is available at Aetrix Electronics and suitable for telecommunications infrastructure, portable medical instrumentation, and industrial PLC modules requiring stable component supply with RoHS-compliant packaging and full traceability.

Supply support for ADM6348-40ARTZ-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 supervision for microprocessor-based systems - specifically engineered for reliable power-up, brownout, and power-down sequencing in portable and harsh-environment applications.

FAQ

What is the exact reset threshold voltage of the ADM6348-40ARTZ-R7 over temperature?

The ADM6348-40ARTZ-R7 has a nominal reset threshold of 4.0 V at 25°C, with guaranteed limits of 3.9 V (min) to 4.1 V (max) across the full −40°C to +85°C operating range. This ±2.5% tolerance is specified in Table 2 of the Rev. B datasheet and includes 40 ppm/°C temperature coefficient effects.

Does the ADM6348-40ARTZ-R7 require an external pull-up resistor on the RESET pin?

Yes, the ADM6348-40ARTZ-R7 features an active-low open-drain RESET output (Pin 2), which requires an external pull-up resistor to a valid logic-high voltage (e.g., 3.3 V or 5 V). Typical values range from 4.7 kΩ to 10 kΩ, selected based on rise time and bus loading requirements.

Can the ADM6348-40ARTZ-R7 operate when the monitored supply drops below 2.0 V?

Yes, the ADM6348-40ARTZ-R7 remains fully functional and continues to assert RESET down to VCC = 1.0 V. Its internal circuitry is designed to maintain valid comparator operation and output state even during deep brownout conditions, as confirmed in the Absolute Maximum Ratings and General Description sections.

What is the typical power-up reset timeout duration for the ADM6348-40ARTZ-R7?

The ADM6348-40ARTZ-R7 guarantees a minimum reset timeout of 100 ms after VCC rises above the 4.0 V threshold, with a typical value of 185 ms and maximum of 280 ms across temperature. This fixed internal timer eliminates dependency on external RC networks and ensures consistent boot behavior.

Is the ADM6348-40ARTZ-R7 pin-compatible with other devices in the ADM63xx family?

Yes, all ADM63xx devices - including ADM6348-40ARTZ-R7 - share identical 3-lead SOT-23 (RT-3) pinout: Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC. However, output type differs: ADM6348 variants use open-drain, while ADM6346 variants use push-pull - requiring schematic review before substitution.