Analog Devices Inc. ADM6326-30ARTZ-R7

Overview

ADM6326-30ARTZ-R7 from Analog Devices is an ultralow-power microprocessor reset circuit in a 3-lead SOT-23 package, designed to monitor 3.0 V supply rails with ±2.5% threshold accuracy over −40°C to +85°C. It provides push-pull active-low RESET output, 100 ms minimum timeout, 1 µA max supply current, and operates down to 1.0 V VCC - ideal for portable microprocessor systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the ADM6326-30ARTZ-R7 datasheet, ADM6326-30ARTZ-R7 pinout, ADM6326-30ARTZ-R7 application, or ADM6326-30ARTZ-R7 equivalent, key selection criteria include reset threshold tolerance (±2.5%), guaranteed operation at VCC ≥ 1.0 V, push-pull drive capability (1.6 mA sink), glitch immunity against fast VCC transients, and compatibility with low-power embedded systems where supply current < 1 µA is critical.

Technical Context

The ADM6326-30ARTZ-R7 integrates a precision voltage reference, comparator with hysteresis (6.3 mV), and a 100–280 ms internal reset timeout timer. Its push-pull RESET output asserts low when VCC falls below 3.0 V (±2.5%) and remains asserted for ≥100 ms after VCC rises above threshold - ensuring stable microprocessor initialization.

It features ultralow ICC (≤1.0 µA at 3.0 V) and maintains valid RESET signaling down to VCC = 1.0 V, enabling robust operation during deep brownout conditions. Glitch immunity is achieved via built-in rejection of negative-going VCC transients up to 200 mV overdrive within sub-µs durations.

Key Specifications

Pinout & Package

ADM6326-30ARTZ-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 MAX6326TRD30+T and TPS3123QDBVRQ1, ADM6326-30ARTZ-R7 delivers superior ultralow ICC (≤1.0 µA) and unique 1.0 V operational capability - making it optimal for battery-critical and deep-brownout-sensitive designs where those alternatives fall short.

Availability

ADM6326-30ARTZ-R7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wireless edge node gateways, and automotive infotainment subsystems requiring stable component supply with RoHS-compliant packaging and extended temperature support.

Supply support for ADM6326-30ARTZ-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 ADM6326 family is part of Analog Devices' precision voltage supervisor product line, engineered specifically for ultralow-power microprocessor reset and supply monitoring in battery-operated and thermally demanding embedded systems.

FAQ

What is the exact reset threshold voltage of ADM6326-30ARTZ-R7 and its tolerance?

The ADM6326-30ARTZ-R7 has a nominal reset threshold of 3.00 V with a guaranteed tolerance of ±2.5% over the full operating temperature range (−40°C to +85°C), translating to 2.925 V minimum and 3.075 V maximum. This specification is validated per Table 2 in the Rev. B datasheet and applies to all units shipped under this orderable part number.

Does ADM6326-30ARTZ-R7 support operation below 2.0 V VCC, and why does that matter?

Yes, ADM6326-30ARTZ-R7 guarantees valid RESET output down to VCC = 1.0 V. This capability is critical for fail-safe behavior during deep brownout events - for example, when a lithium battery discharges to 1.8 V then sags further under load. Unlike many supervisors that disable below 1.8 V, ADM6326-30ARTZ-R7 continues asserting RESET, enabling safe MCU shutdown or nonvolatile state capture.

Is ADM6326-30ARTZ-R7 pin-compatible with other devices in the ADM6326/ADM6328 family?

Yes, ADM6326-30ARTZ-R7 shares identical 3-lead SOT-23 (RT-3) pinout and footprint with all ADM6326/ADM6328/ADM6346/ADM6348 variants, including GND (Pin 1), RESET (Pin 2), and VCC (Pin 3). However, output structure differs: ADM6326-30ARTZ-R7 uses push-pull, while ADM6328 variants use open-drain - so direct substitution requires verifying reset bus topology.

What is the typical reset timeout duration for ADM6326-30ARTZ-R7, and how does it vary?

The ADM6326-30ARTZ-R7 features a typical reset timeout of 185 ms after VCC rises above threshold, with a guaranteed minimum of 100 ms and maximum of 280 ms across temperature and process variation. As shown in Figure 6 of the datasheet, timeout drifts only ±10 ms from 25°C value over −40°C to +85°C - ensuring consistent system initialization timing regardless of ambient conditions.

Can ADM6326-30ARTZ-R7 be used with a 5 V supply, and what are the limits?

Yes, ADM6326-30ARTZ-R7 supports VCC up to 5.5 V per Absolute Maximum Ratings, and its internal circuitry functions correctly across 1.0 V to 5.5 V. However, its 3.0 V threshold is fixed - it monitors only whether the applied VCC falls below 3.0 V ±2.5%. So while it can be powered from 5 V, it is intended to supervise a 3.0 V rail, not a 5 V one.