onsemi NCV4279D1

Overview

NCV4279D1 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 up to 45 V, making it suitable for engine control units and body control modules in 12 V vehicle electrical systems.

For engineers reviewing the NCV4279D1 datasheet, pinout, applications, or equivalent options, key selection considerations include its AEC-Q100 Grade 1 qualification, integrated short-circuit current limiting, adjustable reset delay via external capacitor, and compatibility with high-temperature under-hood environments.

Technical Context

The NCV4279D1 integrates a precision bandgap reference, error amplifier, and PNP pass transistor in a single monolithic structure. Its internal architecture delivers stable regulation without requiring external compensation components.

It features a dedicated RESET output with programmable delay (via C_DELAY), independent of V_OUT regulation status, and includes undervoltage lockout (UVLO) that disables output below ~4.2 V input to prevent erratic behavior during cold cranking.

Key Specifications

Pinout & Package

NCV4279D1 is housed in a thermally enhanced SOIC-8 package with exposed thermal pad (suffix D1), 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 TPS7B8750QKVURQ1, the NCV4279D1 uniquely combines fixed 5.0 V output, integrated RESET with programmable delay, and full automotive qualification in a single SOIC-8 package-reducing component count and validation effort for safety-critical ECUs.

Availability

NCV4279D1 is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS camera ECUs requiring stable component supply across extended automotive temperature ranges and long production lifecycles.

Supply support for NCV4279D1 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 NCV4279D1 belongs to onsemi's Automotive Power Management portfolio, designed specifically for robust, high-reliability voltage regulation in harsh-temperature vehicle subsystems where functional safety and long-term supply stability are critical.

FAQ

What is the maximum input voltage rating for the NCV4279D1?

The NCV4279D1 supports a maximum continuous input voltage of 45 V, and is designed to withstand ISO 7637-2 Load Dump Pulse 5a (41 V, 400 ms) without external protection. This makes the NCV4279D1 suitable for direct connection to automotive battery rails, including transient conditions during alternator load dump events. The device remains fully functional and protected within this range.

Does the NCV4279D1 require external capacitors for stability?

Yes, the NCV4279D1 requires a minimum 10 µF ceramic output capacitor placed close to the OUT and GND pins for loop stability and transient response. An input capacitor (≥1 µF ceramic) is also recommended. The SENSE pin may use a separate 10 µF capacitor if remote sensing is implemented. These values are specified in the official onsemi datasheet for NCV4279D1 and must be followed to ensure proper regulation and noise immunity.

How is the reset delay time programmed on the NCV4279D1?

The reset delay time on the NCV4279D1 is set by connecting an external capacitor between the DELAY pin and GND. Delay time ranges from ~10 ms (with 0.1 µF) to ~100 ms (with 10 µF), following a linear relationship per the datasheet curve. This capacitor controls the charging time of an internal timer, ensuring the RESET pin remains asserted until the output has stabilized - a feature critical for deterministic MCU initialization in automotive systems using NCV4279D1.

Is the NCV4279D1 compatible with lead-free PCB assembly processes?

Yes, the NCV4279D1 is RoHS-compliant and qualified for lead-free reflow soldering per JEDEC J-STD-020. Its SOIC-8 package (D1 variant) supports peak reflow temperatures up to 260°C. The device also meets MSL Level 3 moisture sensitivity classification, requiring bake-out only if exposed to ambient for >168 hours before assembly. Full process guidelines are documented in the NCV4279D1 packaging specification.

Can the NCV4279D1 be used in systems requiring functional safety compliance (e.g., ISO 26262)?

The NCV4279D1 itself is not ASIL-certified, but it is AEC-Q100 Grade 1 qualified and widely deployed in ASIL-B and ASIL-C domains as part of safety mechanisms (e.g., powering watchdog timers or reset supervisors). Its built-in protections - thermal shutdown, short-circuit limiting, and reverse-battery tolerance - support fault containment. System-level ISO 26262 compliance requires integration analysis, but the NCV4279D1 provides foundational robustness for such implementations.