onsemi NCV8501PDW33R2

Overview

NCV8501PDW33R2 from onsemi is a 3.3 V fixed-output automotive-grade LDO linear regulator in SOW-16 exposed pad package, delivering 150 mA output current with ±2.0% accuracy, 0.6 V max dropout at full load, and 90 µA quiescent current at 100 µA load. It integrates ENABLE, active-low RESET with programmable delay, and FLAG monitor for early-warning microprocessor shutdown sequencing in battery-powered automotive control units.

For engineers reviewing the NCV8501PDW33R2 datasheet, pinout, applications, or equivalent options, key selection considerations include its −15 V reverse voltage tolerance, +60 V peak transient survivability, RESET validity down to 1.0 V output, FLAG comparator threshold (1.20 V typical), and thermal shutdown at 150 °C - all critical for under-hood power management design.

Technical Context

The NCV8501PDW33R2 implements a bandgap-referenced error amplifier driving a PNP pass transistor, with independent RESET and FLAG comparators referenced to the same stable 1.28 V internal reference. Its ENABLE input features integrated ESD protection and operates reliably across −0.3 V to 10 V, supporting direct battery-line connection with external series resistor for load-dump immunity.

RESET activation occurs when VOUT drops below 0.97 × VOUT (low threshold) or rises above 0.98 × VOUT (high threshold), with hysteresis minimizing oscillation; DELAY timing is set by external capacitor charging at 2.5 µA typical, enabling configurable reset hold-off from milliseconds to seconds. The FLAG monitor triggers when MON pin voltage falls below 1.20 V ±0.05 V, providing deterministic warning before RESET assertion.

Key Specifications

Pinout & Package

SOW-16 exposed pad (Case 751AG) with thermal pad for enhanced heat dissipation; R_JA = 56 °C/W, R_JP = 35 °C/W (to pin 16). Pin 16 is GND; exposed pad must be soldered to PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCV8501D33R2G, the NCV8501PDW33R2 delivers 3× lower thermal resistance for reliable 150 mA operation in hot environments; versus TLV73333PDBVR, it trades higher dropout and lower current for integrated automotive-grade supervision - eliminating three external components and qualifying for functional safety support.

Availability

NCV8501PDW33R2 is available at Aetrix Electronics and suitable for automotive body control modules, ADAS camera power supplies, and engine control unit sensor interfaces requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for NCV8501PDW33R2 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The NCV8501PDW33R2 belongs to the NCV8501 series of micropower LDO regulators designed specifically for automotive microprocessor power domains, integrating precision voltage regulation with intelligent supervision (RESET, FLAG, ENABLE) to simplify ECU power architecture and meet stringent ISO 16750 and ISO 7637-2 requirements.

FAQ

What is the minimum input voltage required for NCV8501PDW33R2 to maintain regulation at 150 mA?

The NCV8501PDW33R2 requires VIN ≥ VOUT + dropout voltage. With a maximum dropout of 600 mV at 150 mA, the minimum input is 3.3 V + 0.6 V = 3.9 V. This ensures stable 3.3 V output during automotive cold-crank events where battery voltage may dip to 6 V - well above the 3.9 V threshold.

Can the FLAG pin of NCV8501PDW33R2 be used without connecting the MON pin?

No - the FLAG function requires the MON pin to be connected to a voltage divider from VOUT to set the early-warning threshold. If MON is left floating or tied directly to GND/VOUT, FLAG will not assert correctly. Datasheet Figure 16 shows the required resistor divider; MON must be biased to 1.20 V for nominal FLAG activation.

Does NCV8501PDW33R2 support reverse battery protection, and what is the limit?

Yes, the NCV8501PDW33R2 includes integrated reverse battery protection rated to −15 V, as specified in the Maximum Ratings table. This allows direct connection to vehicle battery terminals without external polarity protection diodes, reducing BOM cost and forward voltage drop in the power path.

How is the RESET delay time calculated for NCV8501PDW33R2?

The RESET delay time is calculated using t_DELAY = C_DELAY × (V_DT − V_{RESET_LOW}) / I_CHARGE, where V_DT = 1.8 V typical, V_{RESET_LOW} ≈ 0 V, and I_CHARGE = 2.5 µA typical. For example, a 33 nF capacitor yields t_DELAY ≈ 33 nF × 1.8 V / 2.5 µA = 23.8 ms - matching the value shown in datasheet Application Note section.

Is the exposed thermal pad on the SOW-16 package of NCV8501PDW33R2 electrically connected?

Yes - the exposed pad on the NCV8501PDW33R2 SOW-16 package is internally connected to GND (pin 13) and must be soldered to a PCB ground plane. This connection is essential for achieving the specified R_JA = 56 °C/W and R_JP = 35 °C/W thermal performance; omitting it risks thermal shutdown under 150 mA load.