Analog Devices Inc. ADM6326-25ARTZ-R7

Overview

ADM6326-25ARTZ-R7 from Analog Devices is a precision 2.5 V supply voltage supervisor IC with ultralow 1 µA supply current, active-low open-drain RESET output, and guaranteed operation down to 1 V VCC. It provides 100 ms minimum reset timeout, ±2.5% threshold accuracy over temperature, and glitch immunity against negative-going VCC transients - used in portable microprocessor systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the ADM6326-25ARTZ-R7 datasheet, ADM6326-25ARTZ-R7 pinout, ADM6326-25ARTZ-R7 application, or ADM6326-25ARTZ-R7 equivalent, key selection criteria include reset threshold tolerance (±2.5%), open-drain output drive capability (100 µA sink at 1.2 V), operating temperature range (−40°C to +85°C), and SOT-23-3 package compatibility with space-constrained embedded designs.

Technical Context

The ADM6326-25ARTZ-R7 implements a precision bandgap reference-based comparator with internal hysteresis (6.3 mV) and a 100 ms–280 ms programmable reset timeout timer. Its open-drain RESET output requires an external pull-up resistor and remains functional even when VCC drops to 1 V, enabling robust reset assertion during deep brownout conditions.

It features built-in transient immunity: negative VCC spikes up to 200 mV overdrive are tolerated for durations under 1 µs without false triggering, per Figure 5. The device operates across 1.0 V to 5.5 V supply range and draws only 0.5 µA typical ICC at 3 V, making it suitable for battery-powered applications where quiescent current is critical.

Key Specifications

Pinout & Package

ADM6326-25ARTZ-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 active-low open-drain RESET, and Pin 3 is VCC - no NC or auxiliary pins.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with MAX6326TRD25+T and TPS3808G12QDBVRQ1, the ADM6326-25ARTZ-R7 offers the lowest ICC (1 µA) among open-drain 2.5 V supervisors and guarantees operation down to 1 V - critical for energy-harvesting and coin-cell applications where other alternatives fail to assert reset reliably.

Availability

ADM6326-25ARTZ-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 modules requiring stable component supply and RoHS-compliant packaging.

Supply support for ADM6326-25ARTZ-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 ADM63xx family delivers ultralow-power, precision voltage supervisors targeting battery-operated and space-constrained embedded systems where reliability under brownout and transient conditions is non-negotiable.

FAQ

What is the exact reset threshold voltage of ADM6326-25ARTZ-R7 over temperature?

The ADM6326-25ARTZ-R7 has a nominal reset threshold of 2.5 V at 25°C, with guaranteed range of 2.437 V to 2.562 V across −40°C to +85°C per Table 2. This ±2.5% tolerance ensures consistent 2.5 V rail supervision without calibration, directly supporting systems with tight supply margin requirements.

Does ADM6326-25ARTZ-R7 support operation below 2.5 V VCC?

Yes, ADM6326-25ARTZ-R7 remains fully functional down to 1.0 V VCC. Its RESET output stays asserted (low) as long as VCC is below 2.5 V, and the internal circuitry continues accurate comparison and timing - enabling reliable reset signaling even during deep brownout events where the monitored rail collapses far below its nominal value.

What is the minimum external pull-up resistor required for ADM6326-25ARTZ-R7's open-drain RESET output?

For ADM6326-25ARTZ-R7, the minimum pull-up resistor is determined by worst-case sink current: 100 µA at VCC ≥ 1.2 V (per specs). To ensure VOH ≥ 0.7×VCC at 3.3 V, a 22 kΩ resistor is sufficient. At higher VCC (e.g., 5 V), 33 kΩ maintains adequate rise time and noise margin while minimizing current draw.

How does ADM6326-25ARTZ-R7 handle fast VCC transients?

ADM6326-25ARTZ-R7 incorporates glitch immunity that rejects negative-going VCC transients up to 200 mV overdrive for durations under 1 µs (Figure 5). This prevents false resets caused by switching noise or load-dump events, ensuring only sustained undervoltage conditions trigger the reset - a key requirement in electrically noisy industrial and automotive environments.

Is ADM6326-25ARTZ-R7 pin-compatible with other devices in the ADM632x/ADM634x family?

Yes, ADM6326-25ARTZ-R7 shares identical 3-lead SOT-23-3 (RT-3) pinout (GND, RESET, VCC) and footprint with all ADM6326/ADM6328/ADM6346/ADM6348 variants. However, output structure differs: ADM6326-25ARTZ-R7 is open-drain, while ADM6326-x variants are push-pull - requiring schematic review before substitution.