Analog Devices Inc. ADM6346-41ARTZ-R7

Overview

ADM6346-41ARTZ-R7 from Analog Devices is an ultralow-power, active-low push-pull microprocessor reset circuit in a 3-lead SOT-23 package. It monitors supply voltages with a precise 4.1 V reset threshold (±2.5% over −40°C to +85°C), delivers 100 ms minimum reset timeout, consumes ≤1.75 µA at 5.5 V, and operates down to 1 V supply-enabling reliable power-up sequencing in portable microprocessor systems.

For engineers reviewing the ADM6346-41ARTZ-R7 datasheet, ADM6346-41ARTZ-R7 pinout, ADM6346-41ARTZ-R7 application, or ADM6346-41ARTZ-R7 equivalent, key selection criteria include its push-pull output architecture, guaranteed reset assertion below 4.1 V, glitch-immune response to negative V_CC transients, and compatibility with brownout detection in battery-powered embedded controllers.

Technical Context

The ADM6346-41ARTZ-R7 integrates a precision voltage reference, comparator with hysteresis (9.5 mV), and internal 100–280 ms reset timeout timer. Its push-pull output drives low to ≤0.4 V at 100 µA sink current even when V_CC drops to 1.2 V, ensuring valid reset signaling across wide supply degradation.

Designed for single-supply monitoring, it features built-in immunity to fast negative-going V_CC transients (e.g., <200 µs pulses with >100 mV overdrive) and maintains functional reset generation down to 1.0 V V_CC, supporting deep brownout recovery in low-voltage microcontroller applications.

Key Specifications

Pinout & Package

ADM6346-41ARTZ-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 space-constrained PCB layouts and reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326T41D2+T and TPS3808G33DBVR, ADM6346-41ARTZ-R7 uniquely combines 4.1 V precision threshold, push-pull output, sub-2 µA supply current, and 1 V minimum operation-making it optimal for space- and power-constrained 4.1 V rail supervision without layout or BOM overhead.

Availability

ADM6346-41ARTZ-R7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wireless edge node gateways, and automotive body control units requiring stable component supply with RoHS-compliant packaging and extended temperature support.

Supply support for ADM6346-41ARTZ-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, with design centers worldwide.

The ADM6346 series belongs to Analog Devices' Single-Supply Supervisory Circuits product line, engineered specifically for ultralow-power, precision voltage monitoring in battery-operated and industrial embedded systems.

FAQ

What is the exact reset threshold voltage of ADM6346-41ARTZ-R7 and how does it vary with temperature?

The ADM6346-41ARTZ-R7 has a nominal reset threshold of 4.1 V at 25°C, with tolerance of ±2.5% over the full operating range of −40°C to +85°C. Per Table 2 in the datasheet, the min/max values are 3.997 V (min) and 4.202 V (max) across temperature. Its temperature coefficient is 40 ppm/°C, meaning drift is bounded and predictable-critical for designs requiring deterministic brownout behavior across environmental extremes.

Does ADM6346-41ARTZ-R7 require an external pull-up resistor on the RESET pin?

No, ADM6346-41ARTZ-R7 does not require an external pull-up resistor because it features an active-low push-pull output. Unlike open-drain variants (e.g., ADM6348-41ARTZ-R7), the ADM6346-41ARTZ-R7 internally drives both high and low states on the RESET pin, simplifying interface to standard CMOS reset inputs and eliminating a common BOM item and potential failure point.

Can ADM6346-41ARTZ-R7 operate reliably when the monitored supply drops below 2.0 V?

Yes, ADM6346-41ARTZ-R7 remains fully functional down to V_CC = 1.0 V. Its RESET output stays asserted (low) and maintains valid logic levels-V_OL ≤ 0.4 V at I_SINK = 100 µA-even at 1.2 V V_CC. This ensures fail-safe reset hold-through deep brownout conditions where other supervisors may release prematurely, protecting system integrity in battery-depleted or fault scenarios.

How does the glitch immunity of ADM6346-41ARTZ-R7 protect against false resets?

ADM6346-41ARTZ-R7 incorporates built-in immunity to negative-going V_CC transients: it ignores pulses shorter than ~200 µs (depending on overdrive magnitude), as shown in Figure 5 of the datasheet. This prevents spurious resets caused by switching noise, ESD coupling, or load-dump events-ensuring that only sustained undervoltage conditions trigger reset, which is essential for robust operation in electrically noisy industrial or automotive environments.

What is the reset timeout duration of ADM6346-41ARTZ-R7 and is it adjustable?

The ADM6346-41ARTZ-R7 provides a fixed internal reset timeout of 100 ms minimum, 280 ms maximum, with typical value of 185 ms (per Table 1). This timeout is factory-trimmed and non-adjustable-designed to ensure sufficient hold time for power supply stabilization and microprocessor initialization without external components. No capacitor or resistor is needed, reducing design complexity and board area.