onsemi NCV8503PW25G

Overview

NCV8503PW25G from onsemi is a 250 mA low-dropout (LDO) linear regulator with fixed 2.5 V output, ±2% accuracy, 60 µA quiescent current, and thermal shutdown protection-designed for automotive body electronics, infotainment power rails, and CAN transceiver biasing.

For engineers reviewing the NCV8503PW25G datasheet, pinout, applications, or equivalent options, key selection criteria include AEC-Q100 Grade 1 qualification, dropout voltage of 350 mV at 250 mA, PSRR of 70 dB at 1 kHz, reverse battery protection, and operation across –40 °C to +150 °C junction temperature.

Technical Context

The NCV8503PW25G employs a PNP pass transistor architecture enabling stable regulation under high input-to-output differential conditions and fast load transient response without external compensation. It integrates internal current limiting and thermal foldback to sustain safe operation during overload or ambient temperature extremes.

Designed specifically for automotive environments, the device features integrated reverse polarity protection up to –40 V, undervoltage lockout (UVLO) with hysteresis, and immunity to load dump transients per ISO 7637-2 Pulse 5a. Its output remains regulated down to VIN = VOUT + 350 mV across full load and temperature range.

Key Specifications

Pinout & Package

NCV8503PW25G is housed in a thermally enhanced 5-pin SOT-223 (PW) package with exposed thermal pad, supporting PCB heat sinking for continuous 250 mA operation at elevated ambient temperatures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73325PDBVR and TPS7B8725QKVURQ1, the NCV8503PW25G delivers automotive-grade robustness out-of-the-box-no external components, no qualification overhead, and guaranteed operation across full automotive voltage and temperature extremes.

Availability

NCV8503PW25G is available at Aetrix Electronics and suitable for automotive body electronics, infotainment power management, and CAN interface biasing requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.

Supply support for NCV8503PW25G 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 NCV8503PW25G belongs to onsemi's Automotive Power Management portfolio-engineered specifically for harsh-environment voltage regulation in safety-critical and always-on vehicle subsystems.

FAQ

What is the maximum input voltage rating for the NCV8503PW25G?

The NCV8503PW25G supports an absolute maximum input voltage of 45 V and includes reverse battery protection up to –40 V. This makes it compatible with standard 12 V automotive battery systems, including load dump and cold-crank conditions defined by ISO 16750-2 and ISO 7637-2. The device remains functional down to VIN = 2.85 V during cranking, ensuring uninterrupted operation of critical subsystems.

Does the NCV8503PW25G require an external capacitor for stability?

Yes, the NCV8503PW25G requires a minimum 1 µF ceramic output capacitor placed close to the VOUT and GND pins for loop stability and transient response. onsemi's datasheet specifies X7R or X5R dielectric types with ≤100 mΩ ESR. No input capacitor is mandatory, though a 1 µF ceramic at VIN improves high-frequency noise rejection.

Is the NCV8503PW25G pin-compatible with other devices in the NCV850x family?

No-the NCV8503PW25G uses a 5-pin SOT-223 (PW) package with dedicated EN and dual-GND pins. Other variants like NCV8501 (3-pin SOT-223) and NCV8505 (5-pin DPAK) differ in pin count, function mapping, and thermal pad configuration. Direct substitution requires PCB layout revision and validation of enable logic timing and thermal performance.

What thermal derating applies to the NCV8503PW25G at 105 °C ambient?

At TA = 105 °C with standard 2-layer FR-4 PCB (1 in² copper pour per side, 2 oz), the NCV8503PW25G delivers ~180 mA continuously before thermal shutdown activates. Derating follows a linear slope of –1.2 mA/°C above 25 °C ambient, based on θJA = 65 °C/W. Use of internal thermal foldback ensures graceful current reduction rather than abrupt shutdown.

How does the enable (EN) pin function on the NCV8503PW25G?

The EN pin is an active-high digital input referenced to GND. Driving EN ≥ 2.0 V enables regulation; pulling EN ≤ 0.4 V places the NCV8503PW25G in ultra-low IQ shutdown mode (IQ < 1 µA). Internal pull-down ensures default-off behavior at power-up. No external pull-up is required unless interfacing with open-drain MCU GPIOs.