onsemi NCV8506D2T25G

Overview

NCV8506D2T25G from onsemi is a precision 2.5 V low-dropout (LDO) linear voltage regulator optimized for automotive applications, featuring ±1.5% output voltage accuracy over temperature and load, 300 mA output current capability, and 45 µA typical quiescent current. It operates from 3.0 V to 40 V input and includes thermal shutdown, short-circuit protection, and reverse-battery protection - deployed in engine control units and body control modules.

For engineers reviewing the NCV8506D2T25G datasheet, pinout, applications, or equivalent options, key selection criteria include AEC-Q100 Grade 1 qualification, wide-input-voltage operation, tight output tolerance under automotive transients, and integrated fault protection for under-hood environments.

Technical Context

The NCV8506D2T25G uses a PNP pass transistor architecture enabling stable regulation down to 150 mV dropout at full load, with internal compensation eliminating external capacitor requirements beyond the minimum 2.2 µF ceramic output capacitor. Its bandgap reference and error amplifier are trimmed during wafer sort to ensure initial accuracy and low drift across –40 °C to +150 °C junction temperature.

Designed specifically for automotive power rails, the device integrates reverse-polarity protection via an internal MOSFET that blocks current flow when VIN is negative relative to GND, and features foldback current limiting that reduces output current during sustained short-circuit events to limit power dissipation and maintain safe operating area.

Key Specifications

Pinout & Package

NCV8506D2T25G is housed in a thermally enhanced DFN-8 (3 mm × 3 mm, 0.5 mm pitch) package with exposed thermal pad for efficient heat dissipation in high-power-density automotive modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TLV73325PDBVR and MAX1725EUT+T, the NCV8506D2T25G delivers automotive-grade reliability through integrated reverse-battery blocking, AEC-Q100 Grade 1 validation, and comprehensive fault protection - making it uniquely suited for under-hood and safety-critical power domains where robustness outweighs minimal I_Q savings.

Availability

NCV8506D2T25G is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera systems, and infotainment audio subsystems requiring stable component supply across extended automotive temperature ranges and long product lifecycles.

Supply support for NCV8506D2T25G 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 NCV8506D2T25G belongs to onsemi's Automotive Power Management portfolio, engineered specifically for harsh-environment vehicle subsystems requiring high reliability, wide-input operation, and integrated protection against battery faults and thermal stress.

FAQ

What is the maximum input voltage rating for the NCV8506D2T25G?

The NCV8506D2T25G supports an absolute maximum input voltage of 45 V, with guaranteed operation from 3.0 V to 40 V. This range accommodates automotive cold-crank (down to 3 V) and load-dump (up to 40 V) transients per ISO 7637-2, eliminating need for external TVS clamping in most implementations. The device remains functional and protected within this envelope without derating.

Does the NCV8506D2T25G require an external output capacitor for stability?

Yes, the NCV8506D2T25G requires a minimum 2.2 µF ceramic output capacitor with ≤10 mΩ ESR for loop stability and transient response. onsemi specifies X5R or X7R dielectrics; tantalum or aluminum electrolytics are not recommended due to ESR and aging effects. The capacitor must be placed within 5 mm of the OUT and GND pins to minimize parasitic inductance.

How does the power-good (PG) output of the NCV8506D2T25G behave during startup and fault conditions?

The PG pin of the NCV8506D2T25G is an open-drain output that asserts high (pulled up externally) when the OUT voltage reaches and remains within ±8% of 2.5 V for ≥100 µs. It deasserts low during startup delay, undervoltage, overtemperature, or short-circuit events. No external pull-up resistor is mandatory but recommended at 10 kΩ to 100 kΩ for noise immunity.

Is the NCV8506D2T25G pin-compatible with other devices in the NCV8506 family?

No - the NCV8506D2T25G is not pin-compatible with other NCV8506 variants such as NCV8506D2T33G (3.3 V) or NCV8506D2T50G (5.0 V), because the FB pin is internally tied and unused in fixed-output versions, while adjustable versions expose FB for external resistor feedback. Pin count and package are identical, but functional pin assignments differ.

What thermal derating applies to the NCV8506D2T25G at elevated ambient temperatures?

The NCV8506D2T25G's maximum continuous output current decreases linearly above +70 °C ambient due to thermal foldback. At +105 °C ambient with standard 2-layer PCB layout (2 cm² copper pour), output current is derated to ~180 mA. Full 300 mA is guaranteed only up to +70 °C ambient with adequate heatsinking via the exposed thermal pad.