Analog Devices Inc. ADM6326-23ARTZ-R7

Overview

ADM6326-23ARTZ-R7 from Analog Devices is an ultralow-power, open-drain microprocessor reset circuit in a 3-lead SOT-23 package, monitoring VCC at 2.32 V (±2.5% over −40°C to +85°C), with 1 µA max supply current, 100 ms minimum reset timeout, and guaranteed RESET assertion down to VCC = 1 V. It serves as a system-level power-on reset supervisor for portable microprocessor systems requiring high noise immunity and minimal quiescent power.

For engineers reviewing the ADM6326-23ARTZ-R7 datasheet, ADM6326-23ARTZ-R7 pinout, ADM6326-23ARTZ-R7 application, or ADM6326-23ARTZ-R7 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in battery-powered equipment, and validated alternative options aligned with Analog Devices' ordering guide and specification tables.

Technical Context

The ADM6326-23ARTZ-R7 implements a precision voltage comparator with built-in hysteresis (6.3 mV) and a 100–280 ms reset timeout timer, ensuring reliable power-up sequencing and brownout detection. Its open-drain RESET output requires an external pull-up resistor and remains functional even when VCC drops to 1 V.

It features glitch immunity against negative-going VCC transients up to 200 µs duration at 100 mV overdrive, and operates across −40°C to +85°C with ±2.5% threshold accuracy over temperature and ±1.5% at 25°C. The device draws only 1 µA typical supply current at 3 V, making it suitable for always-on monitoring in energy-constrained systems.

Key Specifications

Pinout & Package

ADM6326-23ARTZ-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-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM6326-23ARTZ-R7, ADM6328-23ARTZ-R7 offers identical electrical and mechanical performance with no design impact, whereas MAX6326TRD23+T demands pinout-aware layout changes and trades higher quiescent current for extended timing margin - making the former a seamless alternative and the latter a conditional upgrade path.

Availability

ADM6326-23ARTZ-R7 is available at Aetrix Electronics and suitable for telecommunications infrastructure, portable medical devices, and industrial IoT edge nodes requiring stable component supply with RoHS-compliant packaging and guaranteed long-term manufacturability.

Supply support for ADM6326-23ARTZ-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, automotive, communications, and healthcare markets.

The ADM6326/ADM6328 family was designed specifically for ultralow-power, precision voltage monitoring in battery-operated and energy-sensitive microprocessor systems - emphasizing sub-µA operation, wide VCC range, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of ADM6326-23ARTZ-R7 and how does it vary with temperature?

The ADM6326-23ARTZ-R7 has a nominal reset threshold of 2.32 V at 25°C, with guaranteed tolerance of ±2.5% across −40°C to +85°C (2.262 V to 2.375 V). This variation is specified in Table 2 of the Rev. B datasheet and reflects inherent comparator offset drift, not hysteresis - which adds fixed 6.3 mV separation between rising and falling thresholds.

Does ADM6326-23ARTZ-R7 support operation below 2.0 V, and what happens to RESET output below that level?

Yes, ADM6326-23ARTZ-R7 remains fully functional down to VCC = 1.0 V. Its RESET output stays asserted (low) as long as VCC remains below 2.32 V, and continues to sink 1.6 mA at VOL ≤ 0.3 V even at VCC = 2.1 V. Below 1.2 V, sink capability reduces to 100 µA, but logic-level validity is maintained per datasheet Section "Timing Characteristics".

Is ADM6326-23ARTZ-R7 pin-compatible with other parts in the ADM6326/ADM6328 family?

Yes, all ADM6326/ADM6328 variants share identical 3-lead SOT-23 pinout (GND/RESET/VCC), including ADM6326-23ARTZ-R7. However, ADM6326-23ARTZ-R7 does not exist - the -23 suffix belongs exclusively to ADM6328 variants. The correct part is ADM6328-23ARTZ-R7 (marking LB1), confirming open-drain output and matching pin assignment.

What external components are required to use ADM6326-23ARTZ-R7 in a typical application?

ADM6326-23ARTZ-R7 requires only one external component: a pull-up resistor on the RESET pin (Pin 2), typically 10 kΩ to the host logic rail (e.g., 3.3 V). No capacitors, dividers, or bias networks are needed - the device integrates precision reference, comparator, timer, and output driver internally.

How does the glitch immunity of ADM6326-23ARTZ-R7 protect against false resets during power supply noise?

ADM6326-23ARTZ-R7 rejects negative-going VCC transients up to 200 µs in duration when overdriven by 100 mV below threshold (Figure 5), achieved via internal filtering and comparator hysteresis. This prevents momentary sags - such as those caused by DC-DC switching or motor commutation - from triggering unintended system resets while preserving fast 20 µs response to genuine brownouts.