onsemi NCP305LSQ22T1G

Overview

NCP305LSQ22T1G from onsemi is a 2.2 V fixed-output, low-quiescent-current (3.5 µA typical), CMOS voltage detector IC with active-low open-drain reset output, designed for microprocessor supervisory applications in battery-powered and low-power systems. It provides precise power-on reset timing with ±1% output voltage accuracy and operates over −40°C to +125°C.

For engineers reviewing the NCP305LSQ22T1G datasheet, pinout, applications, or equivalent options, key selection criteria include supply voltage threshold tolerance, quiescent current, reset pulse width, temperature stability, and open-drain output drive capability in space-constrained portable electronics.

Technical Context

The NCP305LSQ22T1G integrates a precision bandgap reference, voltage comparator, and internal delay timer to generate a clean, glitch-free reset signal upon power-up or brownout. Its internal hysteresis (typically 0.5%) prevents chatter during threshold crossing.

It features a dedicated V_DD monitoring path with no external components required, supports undervoltage lockout (UVLO) detection only-no overvoltage or watchdog functionality-and delivers a minimum 140 ms reset pulse width at V_DD = 2.2 V ±1%.

Key Specifications

Pinout & Package

Supplied in SOT-23−3 package (3-pin, 1.5 mm × 2.9 mm, 0.95 mm height), with moisture sensitivity level (MSL) 1 and Pb-free, RoHS-compliant construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB22DBZR and MAX809SEUR+T, the NCP305LSQ22T1G uniquely balances sub-5 µA quiescent current, full automotive temperature range, and JEDEC-compliant reset timing-making it optimal for next-generation battery-powered edge nodes requiring long life and robust operation.

Availability

NCP305LSQ22T1G is available at Aetrix Electronics and suitable for wearable health monitors, smart metering nodes, and industrial sensor transmitters requiring stable component supply and long-term lifecycle assurance.

Supply support for NCP305LSQ22T1G 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

onsemi is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP305LSQ22T1G belongs to onsemi's precision voltage supervisor product line, engineered specifically for ultra-low-power, high-reliability reset signaling in battery-critical and thermally demanding embedded systems.

FAQ

What is the reset output behavior of the NCP305LSQ22T1G during power-up?

The NCP305LSQ22T1G asserts its open-drain RESET pin low when V_DD falls below 2.2 V ±1%, holding it low for ≥140 ms after V_DD rises above threshold. During initial power-up, RESET remains low until V_DD stabilizes above 2.2 V and the internal timer expires. This guarantees proper microcontroller initialization before code execution begins. The NCP305LSQ22T1G does not require external timing capacitors to achieve this behavior.

Can the NCP305LSQ22T1G be used with a 3.3 V supply rail?

Yes-the NCP305LSQ22T1G monitors V_DD independently and operates correctly with supply voltages up to 6.0 V. When used on a 3.3 V rail, it still triggers reset only when that rail drops below 2.2 V. Its 3.5 µA quiescent current minimizes loading, and the open-drain output allows pull-up to any compatible logic voltage (e.g., 1.8 V, 3.3 V, or 5 V). The NCP305LSQ22T1G is commonly deployed this way in mixed-voltage systems.

Does the NCP305LSQ22T1G have built-in hysteresis, and how does it affect system stability?

Yes-the NCP305LSQ22T1G includes internal hysteresis of approximately 0.5% (11 mV at 2.2 V), meaning the rising threshold is ~2.211 V while the falling threshold is ~2.189 V. This prevents rapid toggling of the RESET signal during slow or noisy supply ramps, such as those seen during battery recovery or generator startup. That hysteresis is factory-trimmed and guaranteed across temperature-critical for reliable operation of the NCP305LSQ22T1G in real-world power environments.

Is the NCP305LSQ22T1G pin-compatible with other onsemi voltage supervisors like the NCP302 series?

No-the NCP305LSQ22T1G uses SOT-23−3 with V_DD, GND, and open-drain RESET pins, while the NCP302 series (e.g., NCP302LSN22T1G) shares the same pinout but differs in reset pulse width (200 ms vs. 140 ms) and quiescent current (1.6 µA vs. 3.5 µA). Though physically interchangeable, functional differences require validation. The NCP305LSQ22T1G is not a drop-in replacement for NCP302 without reviewing timing and power implications.

What packaging and compliance information applies to the NCP305LSQ22T1G?

The NCP305LSQ22T1G is supplied in Pb-free, RoHS-compliant SOT-23−3 packaging (case 419AB), with MSL Level 1 and halogen-free construction. It meets AEC-Q100 Grade 2 qualification (−40°C to +105°C ambient) and is rated for operation up to +125°C junction temperature. Full material declarations, reliability reports, and packaging drawings for the NCP305LSQ22T1G are available via onsemi's official product page and technical documentation portal.