onsemi NCV8508DW50G

Overview

NCV8508DW50G from onsemi is an automotive-grade 500 mA low-dropout linear 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 NCV8508DW50G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 Grade 1 qualification, ultra-low quiescent current (25 µA typical), wide input range, integrated fault protection, and SOIC-8 thermally enhanced package compatibility with automotive PCB layout constraints.

Technical Context

The NCV8508DW50G integrates a PNP pass transistor with internal current limiting, thermal foldback, and undervoltage lockout. Its feedback loop is internally trimmed for 5.0 V output without external resistors, and regulation remains stable under load transients up to 100 mA/µs.

Designed for harsh automotive environments, it features reverse-battery protection down to -40 V, short-circuit robustness with automatic recovery, and immunity to load-dump pulses per ISO 7637-2 Pulse 5a (12 V system).

Key Specifications

Pinout & Package

NCV8508DW50G is housed in an SOIC-8 package with exposed thermal pad (suffix "DW"), optimized for high-power dissipation in constrained automotive layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73350PDBVR and TPS7B8750QKVURQ1, the NCV8508DW50G offers superior reverse-battery tolerance (-40 V), broader input range (up to 45 V), and lower quiescent current (25 µA vs. 35 µA), making it optimal for under-hood deployment where electrical stress and battery longevity are critical.

Availability

NCV8508DW50G is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera systems, and electric power steering control units requiring stable component supply across automotive production lifecycles.

Supply support for NCV8508DW50G 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 NCV8508DW50G belongs to onsemi's Automotive Power Management portfolio, designed specifically for reliable, high-temperature operation in safety-critical vehicle subsystems with stringent EMI and fault-tolerance requirements.

FAQ

What is the maximum input voltage rating for the NCV8508DW50G?

The NCV8508DW50G supports a maximum input voltage of 45 V, validated per ISO 7637-2 load-dump test conditions for 12 V automotive systems. This rating allows safe operation during transient overvoltage events without external clamping components. The device also withstands reverse battery connection down to -40 V, a key differentiator for under-hood applications where polarity reversal risk exists.

Does the NCV8508DW50G require external components for basic operation?

Yes, the NCV8508DW50G requires a minimum 10 µF ceramic output capacitor for stability and a 10 nF soft-start capacitor on the SS pin to control output ramp rate. An input bulk capacitor (≥10 µF) is recommended near the IN pin. No external feedback resistors are needed since the 5.0 V output is internally trimmed and fixed. All capacitors must be X7R or better dielectric for automotive temperature range performance.

Is the NCV8508DW50G pin-compatible with other onsemi LDOs in SOIC-8 package?

No, the NCV8508DW50G has a unique pinout among onsemi's automotive LDOs: EN and SS pins are assigned to pins 4 and 5 respectively, differing from NCV86xx and NCV87xx families. Pin mapping must be verified against the official onsemi NCV8508DW50G datasheet (document number NCV8508-D.PDF). Layout reuse is not possible without schematic and footprint review.

What thermal performance can be expected from the NCV8508DW50G in SOIC-8 DW package?

In the SOIC-8 DW package with exposed thermal pad soldered to ≥2 cm² copper area, the NCV8508DW50G achieves θ_JA ≈ 60°C/W. At 500 mA output and 13.5 V input, power dissipation is ~4.25 W, resulting in ~255°C rise above ambient-exceeding safe limits. Derating to ≤300 mA continuous load or adding forced airflow is required for sustained operation above 85°C ambient. Thermal foldback activates above 140°C junction temperature.

How does the NCV8508DW50G support functional safety compliance in automotive designs?

The NCV8508DW50G supports functional safety by providing predictable fault responses: thermal shutdown halts output until junction cools, short-circuit current limiting prevents destructive failure, and reverse-battery protection avoids latch-up. While not ASIL-certified itself, it meets hardware-level requirements for ASIL-B subsystems when used with appropriate diagnostics. Its AEC-Q100 Grade 1 qualification and failure-in-time (FIT) rate of 122 FIT (per IEC 62380) are documented in onsemi's reliability reports for NCV8508DW50G.