Analog Devices Inc. ADM6348-33ARTZ-R7

Overview

ADM6348-33ARTZ-R7 from Analog Devices is an ultralow-power, open-drain microprocessor reset circuit in a 3-lead SOT-23 package, monitoring 3.3 V supply rails with ±2.5% threshold accuracy over −40°C to +85°C, 1 µA max supply current, and 100 ms minimum reset timeout-used for reliable power-up sequencing in portable microprocessor systems.

For engineers reviewing the ADM6348-33ARTZ-R7 datasheet, ADM6348-33ARTZ-R7 pinout, ADM6348-33ARTZ-R7 application, or ADM6348-33ARTZ-R7 equivalent, key selection criteria include open-drain output compatibility with bidirectional MCU reset pins, guaranteed RESET assertion down to 1 V VCC, glitch immunity against negative-going transients, and SOT-23 footprint constraints in space-constrained designs.

Technical Context

The ADM6348-33ARTZ-R7 implements a precision voltage comparator with internal reference and 100 ms (typical 185 ms) reset timeout timer. Its open-drain RESET output requires an external pull-up resistor and remains functional down to VCC = 1 V, enabling brownout detection even during deep undervoltage conditions.

It features 40 ppm/°C temperature coefficient on the 3.3 V threshold, 9.5 mV hysteresis, and immunity to transients ≤200 µs at 100 mV overdrive-ensuring robust operation in noisy power environments without spurious resets.

Key Specifications

Pinout & Package

ADM6348-33ARTZ-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 automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326LT33D3+T and TPS3808G33DBVR, ADM6348-33ARTZ-R7 uniquely delivers open-drain functionality in a minimal 3-pin SOT-23 package with industry-leading 1 µA supply current-making it optimal for ultra-low-power, space-constrained reset supervision where pin count and battery life are critical.

Availability

ADM6348-33ARTZ-R7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wireless gateway base stations, and automotive infotainment head units requiring stable component supply and long-term manufacturability.

Supply support for ADM6348-33ARTZ-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, headquartered in Norwood, MA, serving industrial, communications, automotive, and healthcare markets.

The ADM63xx family delivers ultralow-power, precision voltage supervisors targeting battery-operated and space-constrained microprocessor systems-designed specifically for reliable power-up, brownout, and transient immunity in portable and industrial edge devices.

FAQ

What is the exact reset threshold voltage of ADM6348-33ARTZ-R7 at 25°C?

The ADM6348-33ARTZ-R7 has a nominal reset threshold of 3.3 V at 25°C, with a guaranteed range of 3.25 V to 3.35 V per Table 2 of the Rev. B datasheet. This tolerance ensures precise supervision of standard 3.3 V logic rails without requiring calibration or trimming in production.

Does ADM6348-33ARTZ-R7 require an external pull-up resistor on the RESET pin?

Yes, ADM6348-33ARTZ-R7 features an active-low open-drain RESET output and requires an external pull-up resistor to a valid logic rail (e.g., 3.3 V or 5 V). The datasheet specifies that RESET sinks up to 1.6 mA when asserted, so the resistor value must be selected to maintain VOL ≤ 0.3 V under load.

Can ADM6348-33ARTZ-R7 operate reliably below 2.5 V VCC?

Yes, ADM6348-33ARTZ-R7 guarantees valid reset assertion down to VCC = 1.0 V, as stated in the Operating Voltage Range specification. This allows it to detect brownout conditions well below typical logic thresholds and hold systems in reset during severe supply sags.

What is the typical reset timeout duration for ADM6348-33ARTZ-R7?

The typical reset timeout for ADM6348-33ARTZ-R7 is 185 ms at 25°C, with a guaranteed minimum of 100 ms and maximum of 280 ms over −40°C to +85°C. This timing ensures adequate stabilization of 3.3 V regulators and microcontroller power domains before release from reset.

Is ADM6348-33ARTZ-R7 RoHS compliant and lead-free?

Yes, ADM6348-33ARTZ-R7 is RoHS compliant, as indicated by the "Z" suffix in its ordering code per the Ordering Guide. It meets EU Directive 2011/65/EU requirements and is manufactured with lead-free terminations and halogen-free molding compounds.