Analog Devices Inc. ADM6346-43ARTZ-R7

Overview

ADM6346-43ARTZ-R7 from Analog Devices is a precision ultralow-power microprocessor reset circuit in a 3-lead SOT-23 package, featuring a 4.3 V ±2.5% reset threshold, push-pull active-low RESET output, 100 ms minimum reset timeout, and operation down to 1.0 V supply voltage. It monitors power rails in portable and embedded systems where brownout immunity and minimal quiescent current (1.0 µA max) are critical.

For engineers reviewing the ADM6346-43ARTZ-R7 datasheet, ADM6346-43ARTZ-R7 pinout, ADM6346-43ARTZ-R7 application, or ADM6346-43ARTZ-R7 equivalent, key selection criteria include guaranteed reset assertion below 4.3 V with 9.5 mV hysteresis, glitch-immune response to negative V_CC transients, and compatibility with microprocessor reset inputs requiring push-pull drive without external pull-up.

Technical Context

The ADM6346-43ARTZ-R7 integrates a precision voltage reference, comparator with built-in hysteresis (9.5 mV), and a 100–280 ms reset timeout timer. Its push-pull output drives low to ≤0.3 V at 1.6 mA when asserted and sources up to 0.8 × V_CC when deasserted, enabling direct interface to standard CMOS reset inputs.

It operates across −40°C to +85°C with supply voltage range 1.0 V to 5.5 V and exhibits <40 ppm/°C temperature coefficient on reset threshold. The device asserts RESET within 20 µs of V_CC falling below 4.3 V and maintains reset for ≥100 ms after V_CC rises above threshold - ensuring stable microprocessor initialization.

Key Specifications

Pinout & Package

ADM6346-43ARTZ-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 (active-low push-pull), and Pin 3 is V_CC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326TUT43+T and TPS3808G33DBVR, ADM6346-43ARTZ-R7 uniquely combines 4.3 V precision threshold, push-pull drive, and 3-pin SOT-23 packaging - enabling drop-in replacement in 4.3 V rail monitoring where board space and BOM simplicity are constrained.

Availability

ADM6346-43ARTZ-R7 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control systems, and portable medical devices requiring stable component supply with RoHS-compliant packaging and extended temperature support.

Supply support for ADM6346-43ARTZ-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.

The ADM63xx family delivers ultralow-power, precision voltage monitoring for microprocessor-based systems - designed specifically for reliable power-up, brownout, and power-down supervision in space- and energy-constrained applications.

FAQ

What is the exact reset threshold voltage of ADM6346-43ARTZ-R7 over temperature?

The ADM6346-43ARTZ-R7 has a nominal reset threshold of 4.3 V at 25°C, with tolerance of ±2.5% (4.192 V to 4.407 V) across −40°C to +85°C. Its temperature coefficient is 40 ppm/°C, meaning threshold drift is bounded and predictable - critical for designs operating in automotive or industrial ambient conditions where thermal stability is required.

Does ADM6346-43ARTZ-R7 require an external pull-up resistor on the RESET pin?

No, ADM6346-43ARTZ-R7 features an active-low push-pull RESET output and does not require an external pull-up resistor. This distinguishes it from open-drain variants like ADM6348-43ARTZ-R7 and simplifies interface to microprocessors such as ARM Cortex-M series that accept direct push-pull reset signals - reducing component count and PCB area.

Can ADM6346-43ARTZ-R7 operate when the monitored supply drops below 2.0 V?

Yes, ADM6346-43ARTZ-R7 remains fully functional down to V_CC = 1.0 V. Its RESET output stays valid and asserted until V_CC falls below 1.0 V, and it continues to monitor and respond to threshold violations throughout this range - enabling robust fail-safe behavior during deep brownout conditions in battery-powered systems.

What is the minimum reset timeout duration specified for ADM6346-43ARTZ-R7?

The minimum guaranteed reset timeout for ADM6346-43ARTZ-R7 is 100 ms. Typical timeout is 185 ms, and maximum is 280 ms across temperature. This ensures sufficient hold time for power supply stabilization and microprocessor core initialization - meeting requirements for ARM, RISC-V, and x86-compatible processors that mandate ≥100 ms reset assertion after power-up.

How does ADM6346-43ARTZ-R7 handle fast negative transients on the VCC line?

ADM6346-43ARTZ-R7 incorporates built-in glitch immunity against negative-going V_CC transients. As shown in Figure 5 of its datasheet, it tolerates pulses up to 200 mV below threshold for durations under 1 µs without asserting RESET - preventing spurious resets caused by switching noise, ESD coupling, or load-dump events in electrically noisy environments.