onsemi NCV8518CPDR2G

Overview

NCV8518CPDR2G from onsemi is an automotive-grade linear voltage regulator with integrated watchdog, wake-up, RESET, and ENABLE functions. It delivers a precise 5.0 V ±2% output at up to 150 mA, features 356 mV typical dropout at 150 mA, 70 µA quiescent current, and supports 45 V load-dump transients - making it suitable for engine control units and instrument clusters requiring robust microprocessor supervision.

For engineers reviewing the NCV8518CPDR2G datasheet, pinout, applications, or equivalent options, key selection considerations include its AEC-Q100 Grade 1 qualification, SOIC-8 EP (Case 751AC) package with exposed pad, micropower sleep mode (<1.0 µA), and single-resistor programmability of RESET delay, wake-up period, and wake-up-to-RESET timing.

Technical Context

The NCV8518CPDR2G integrates a precision LDO regulator core with digital supervisory logic: a CMOS-compatible watchdog input (WDI) monitors falling edges with 30–70% VOUT threshold and ≥1 µs pulse width requirement; a buffered Delay pin sets all timing via external RDelay (60 kΩ typical), governing power-on reset (2.0–4.0 ms), wake-up period (18–32 ms), and wake-up duty cycle (45–55%).

Its safety architecture includes thermal shutdown (150°C trip), current limiting (255–510 mA), short-circuit protection, and UVLO detection (~4.65 V at 20°C). The device operates across −40°C to +150°C junction temperature and maintains regulation during ISO 16750-2 Class B load-dump transients up to 45 V.

Key Specifications

Pinout & Package

NCV8518CPDR2G uses the SOIC-8 EP (Case 751AC) package with exposed thermal pad. Pin 1 is top-left corner (notch side), pin 8 is top-right; exposed pad must be connected to GND for optimal thermal performance and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive voltage regulator with supervisory functions applications.

Compared with TLV70750PDRVR and MAX16126ATP+T, the NCV8518CPDR2G uniquely combines 5 V regulation, watchdog, wake-up, and RESET in one SOIC-8 EP package - eliminating external timing components and reducing system-level complexity for automotive microprocessor supervision.

Availability

NCV8518CPDR2G is available at Aetrix Electronics and suitable for engine control units, instrument clusters, body control modules, and chassis electronics requiring stable component supply across automotive production lifecycles.

Supply support for NCV8518CPDR2G 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 electronics for automotive, industrial, and cloud power applications.

The NCV8518C product line was designed specifically for automotive microprocessor supervision - integrating precision regulation, fault detection, and low-power wake-up capability into a single AEC-Q100 qualified device.

FAQ

What is the maximum input voltage the NCV8518CPDR2G can withstand during automotive load-dump events?

The NCV8518CPDR2G is rated for 45 V peak transient voltage per ISO 16750-2 Class B testing. This capability is guaranteed by design and allows the device to survive load-dump events without external clamping diodes or TVS devices - a key advantage in under-hood ECU applications where space and cost are constrained. The NCV8518CPDR2G maintains regulation throughout the transient if input remains above dropout.

How does the Delay pin function in the NCV8518CPDR2G, and what external component is required?

The Delay pin on the NCV8518CPDR2G provides a buffered 0.48 V reference used internally to generate timing currents for RESET delay, wake-up period, and wake-up-to-RESET timing. An external resistor (RDelay) must be connected between Delay and GND - typical values are 60 kΩ (24 ms wake-up period), 120 kΩ (47 ms), or 500 kΩ (194 ms). No capacitor is required; timing is resistor-only and temperature-stable.

Does the NCV8518CPDR2G support true shutdown mode, and what is its disable current?

Yes, the NCV8518CPDR2G supports true shutdown via its ENABLE pin: applying logic low disables the pass transistor and reduces total current consumption to less than 1.0 µA at TA ≤ +125°C. This ultra-low disable current enables long-term battery preservation in always-connected vehicle modules such as telematics or alarm systems - a critical feature confirmed in the Electrical Characteristics table (IDIS parameter).

What is the wake-up signal behavior when the NCV8518CPDR2G detects a missing watchdog pulse?

When the NCV8518CPDR2G does not detect a valid falling edge on the WDI pin within one wake-up period, it asserts RESET low at the end of that period and forces the Wake Up output low regardless of timing. After RESET returns high, the wake-up cycle resumes. This behavior ensures deterministic fault recovery - the NCV8518CPDR2G will not generate further wake-up pulses until the system resets and re-establishes watchdog communication.

Is the NCV8518CPDR2G pin-compatible with other variants in the NCV8518C family, such as the SOIC-16 version?

No, the NCV8518CPDR2G (SOIC-8 EP) is not pin-compatible with the SOIC-16 WB EP variant (e.g., NCV8518CPWR2G). The SOIC-8 has 8 pins with dedicated WDI, ENABLE, RESET, and Wake Up signals, while the SOIC-16 includes multiple NC pins and different pin assignments - requiring separate PCB layouts. Both share identical electrical functionality and timing equations, but mechanical compatibility is not supported.