onsemi NCV8675DS33G

Overview

NCV8675DS33G from onsemi is a precision 3.3 V fixed-output, low-dropout linear regulator delivering up to 350 mA output current with 34 µA typical quiescent current at light load, ±2.0% output accuracy over full temperature range, and integrated reset functionality with adjustable delay. It serves as a primary power supply for automotive microcontrollers requiring stable voltage under wide input (4.5 V–45 V) and harsh thermal conditions.

For engineers reviewing the NCV8675DS33G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage ≤600 mV at 350 mA, AEC-Q100 qualification, reverse-voltage protection down to −42 V, thermal shutdown at 150 °C, and reset timing controllable via external capacitor on the D pin.

Technical Context

The NCV8675DS33G uses a PNP pass transistor controlled by an error amplifier with bandgap reference, enabling low dropout and high temperature stability. Its internal architecture integrates reset generation with accurate switching thresholds (2.97 V to 3.168 V), programmable delay via D-pin charging current (4 µA typical), and open-collector RO output.

Protection circuitry includes reverse-voltage clamp (−42 V), short-circuit/overcurrent limiting (350 mA nominal, 100–600 mA short-circuit), and thermal shutdown triggered above 150 °C. No external components are required for fault protection, and stability is ensured with ≥22 µF output capacitance and ESR < 7 mΩ.

Key Specifications

Pinout & Package

D2PAK−5 package (Case 936A), surface-mount, thermally enhanced with exposed tab connected internally to Pin 3 (GND). Tab soldering improves thermal dissipation in high-power automotive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout, automotive-grade regulator applications.

Compared with NCV8675DS33G, the NCV8675DS50G offers identical automotive robustness and pin compatibility but targets 5.0 V systems, whereas TLV73333PDBVR trades automotive qualification and integrated reset for smaller size and lower cost in benign environments.

Availability

NCV8675DS33G is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera modules, engine control subsystems, and infotainment power management requiring stable component supply across extended temperature and long product lifecycles.

Supply support for NCV8675DS33G 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, high-reliability silicon solutions for automotive, industrial, and cloud power applications.

The NCV8675 series belongs to onsemi's automotive-qualified linear regulator portfolio, designed specifically for demanding vehicle electrical systems requiring AEC-Q100 compliance, wide-input operation, and integrated functional safety features like reset and fault protection.

FAQ

What is the maximum input voltage rating for the NCV8675DS33G?

The NCV8675DS33G supports an absolute maximum input voltage of 45 V, with operating range specified from 4.5 V to 45 V. This allows it to withstand automotive load-dump transients defined in ISO 7637-2 Pulse 5a without external clamping, making it suitable for direct battery connection in 12 V and 24 V vehicle architectures.

Does the NCV8675DS33G require external components for basic operation?

No, the NCV8675DS33G operates with only two external capacitors: a 100 nF ceramic input capacitor (Cin) and a 22 µF output capacitor (Cout) with ESR < 7 mΩ. The reset delay capacitor (CD) is optional if default timing suffices; all protection functions - reverse-voltage clamp, current limit, and thermal shutdown - are fully internal and require no external circuitry.

How is the reset delay time configured on the NCV8675DS33G?

The reset delay time on the NCV8675DS33G is set by an external capacitor connected between Pin 4 (D) and GND. With a typical internal charging current of 4 µA and upper timing threshold of 1.3 V, t_RD ≈ C_D × 1.3 V / 4 µA. For example, a 47 nF capacitor yields ~15.3 ms delay, scalable across 10–24 ms per datasheet Figure 19 and 33.

Is the NCV8675DS33G pin-compatible with other regulators in its family?

Yes, the NCV8675DS33G is pin-for-pin compatible with the NCV8675DS50G (5.0 V version) and functionally compatible with the discontinued NCV4275 series. All share identical D2PAK−5 pinout (Vin, RO, GND/Tab, D, Vout), enabling voltage variant swaps or upgrades to lower quiescent current without PCB revision.

What thermal performance can be expected from the NCV8675DS33G in a standard PCB layout?

In a standard layout with 1 oz. copper, 100 mm² thermal pad area, the NCV8675DS33G achieves R_thJA ≈ 82.1 °C/W (D2PAK). At 350 mA load and 13.5 V input, power dissipation is ~3.6 W; this results in ~295 °C rise above ambient - confirming that heatsinking or larger copper pours are mandatory for continuous full-load operation at elevated ambient temperatures.