onsemi NCV4279D1G

Overview

NCV4279D1G from onsemi is an automotive-grade 500 mA low-dropout linear voltage regulator with fixed 5.0 V output, ±2% accuracy, thermal shutdown, and reverse-battery protection. It operates over -40°C to +150°C ambient temperature and supports input voltages from 5.5 V to 45 V, making it suitable for engine control units and body electronics power rails.

For engineers reviewing the NCV4279D1G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 Grade 1 qualification, integrated reset flag with programmable delay, short-circuit protection behavior, and dropout voltage at 500 mA load under cold-crank conditions.

Technical Context

The NCV4279D1G integrates a precision bandgap reference, error amplifier, and PNP pass transistor in a single monolithic IC. Its internal architecture includes a dedicated reset comparator with external capacitor timing and a dedicated RESET output that asserts low when V_OUT falls below 4.65 V ±25 mV.

It features active current limiting with foldback, thermal shutdown with hysteresis (T_SHDN = 165°C ±10°C), and reverse-battery protection down to -42 V, enabling robust operation in harsh automotive electrical environments without external components.

Key Specifications

Pinout & Package

NCV4279D1G is housed in a thermally enhanced SOIC-8 package with exposed thermal pad (EP), optimized for high-power dissipation in compact automotive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73350PDBVR and TPS7B6950QDCYRQ1, the NCV4279D1G uniquely delivers 500 mA output, integrated reset with programmable delay, and full AEC-Q100 Grade 1 compliance in one SOIC-8 EP package-making it the only option among the three capable of powering full-featured automotive ECUs without supplemental circuitry.

Availability

NCV4279D1G is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS camera ECUs requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.

Supply support for NCV4279D1G 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 NCV4279D1G belongs to onsemi's Automotive Power Management portfolio, designed specifically for demanding under-hood and chassis-mounted electronic control units requiring high reliability, wide input range, and integrated diagnostics.

FAQ

What is the maximum input voltage rating for the NCV4279D1G?

The NCV4279D1G supports an absolute maximum input voltage of 45 V, with guaranteed operation from 5.5 V to 45 V. This range accommodates 12 V and 24 V vehicle architectures, including cold-crank events down to 4.5 V and load-dump transients up to 60 V when used with appropriate external clamping. The NCV4279D1G itself does not clamp load dumps-it relies on upstream TVS protection.

Does the NCV4279D1G require an external capacitor on the DELAY pin?

Yes, the NCV4279D1G requires an external capacitor connected between the DELAY pin and GND to set the reset timeout duration after power-up. A typical value is 100 nF, yielding approximately 200 ms delay. Without this capacitor, the RESET output remains asserted indefinitely. The NCV4279D1G datasheet specifies DELAY pin capacitance vs. delay time curves for precise timing calibration.

Is the NCV4279D1G pin-compatible with other regulators in the NCV4279 family?

No-the NCV4279D1G is not pin-compatible with earlier variants like NCV4279D2G (3.3 V version) or NCV4279D3G (8.5 V version). While all share the same SOIC-8 EP package and pinout, the output voltage is fixed per variant and cannot be adjusted. The NCV4279D1G must be used where exactly 5.0 V ±2% is required; substitution requires verification of downstream voltage tolerance.

How does the NCV4279D1G handle reverse-battery conditions?

The NCV4279D1G incorporates internal reverse-battery protection that blocks current flow when the IN pin is biased negative relative to GND. It withstands -42 V continuously without damage or latch-up, eliminating the need for external series diodes. This feature ensures robustness during improper jump-start procedures or battery terminal reversal-critical for field-repair scenarios. The NCV4279D1G remains fully functional after such events.

What thermal performance can be expected from the NCV4279D1G in SOIC-8 EP package?

In a standard 4-layer PCB with 2 in² of 2-oz copper connected to the exposed pad, the NCV4279D1G achieves θ_JA ≈ 45°C/W. At 500 mA output and 13.5 V input, power dissipation is ~4.25 W, resulting in ~190°C junction rise above ambient-exceeding safe limits. Derating is required: maximum continuous load drops to ~300 mA at 85°C ambient. The NCV4279D1G's thermal shutdown activates at 165°C to prevent damage.