onsemi NCV8509PDW18R2G

Overview

NCV8509PDW18R2G from onsemi is an automotive-grade dual linear voltage regulator with sequenced power-up, delivering 3.3 V ±2% (115 mA) and 1.8 V ±2% (100 mA) outputs to protect microcontroller I/O and core logic during startup. It features programmable slew rate control, dual-drive RESET with 0 V validity, thermal shutdown, and a power shunt for optimized on-chip dissipation in powertrain and telematics systems.

For engineers reviewing the NCV8509PDW18R2G datasheet, pinout, applications, or equivalent options, key selection criteria include output sequencing integrity, RESET threshold hysteresis (18 mV), SLEW-controlled rise time (469 V/s for VOUT1), thermal shutdown at 150–210 °C, and AEC-Q100 qualification for automotive deployment.

Technical Context

The NCV8509PDW18R2G implements independent error amplifiers and bandgap references for each output, enabling precise tracking and independent load regulation. Its dual-drive RESET circuit derives power from both VIN1 and VOUT1, ensuring valid reset assertion down to 0 V on either rail - a critical feature for fail-safe microcontroller initialization.

Power shunt operation uses external REX to divert VOUT2 current path, reducing on-die power dissipation by shifting heat off-chip. The SLEW pin controls output ramp rate via a 6.0 µA internal current source charging an external capacitor, while Delay pin enables programmable reset timeout using a second external capacitor.

Key Specifications

Pinout & Package

Package: SOIC-16 Wide Body with Exposed Pad (Case 751AG, PDW suffix), RoHS-compliant, AEC-Q100 qualified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual sequenced linear regulator applications.

Compared with NCV8509PDW18G, the R2G variant adds tape-and-reel support for high-volume manufacturing, while TPS7H1101AQPWPRQ1 trades integrated sequencing and dual-source RESET for wider output adjustability and higher current - making it unsuitable as a drop-in replacement but viable for non-automotive, single-rail designs.

Availability

NCV8509PDW18R2G is available at Aetrix Electronics and suitable for automotive powertrain control units, telematics gateway modules, and ADAS camera ECUs requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for NCV8509PDW18R2G 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 focused on energy-efficient electronics, with leadership in automotive, industrial, and cloud power solutions.

The NCV8509PDW18R2G belongs to the NCV8509 Series of sequenced dual linear regulators, designed specifically for automotive microcontroller power integrity - emphasizing startup sequencing, RESET reliability, and thermal resilience in under-hood environments.

FAQ

What is the output voltage configuration of the NCV8509PDW18R2G?

The NCV8509PDW18R2G delivers two fixed, factory-set outputs: VOUT1 = 3.3 V ±2% (115 mA max) for MCU I/O, and VOUT2 = 1.8 V ±2% (100 mA max) for MCU core logic. This 3.3 V/1.8 V pairing is encoded in the part number suffix "18" and cannot be adjusted externally.

Does the NCV8509PDW18R2G support power sequencing, and how is it implemented?

Yes, the NCV8509PDW18R2G implements hardware-enforced power sequencing: VOUT1 ramps before VOUT2 during startup to prevent I/O latch-up in modern microcontrollers. Sequencing is intrinsic to the IC's internal architecture and requires no external control signals or configuration - it is guaranteed across temperature and load.

How does the dual-drive RESET function work in the NCV8509PDW18R2G?

The NCV8509PDW18R2G RESET output remains valid down to 0 V on either VIN1 or VOUT1 because it draws operating current from both rails. If VOUT1 collapses, VIN1 sustains RESET assertion; if VIN1 fails, VOUT1 maintains it. This dual-source design eliminates single-point failure modes common in standard LDOs.

What is the purpose of the SLEW pin on the NCV8509PDW18R2G, and how is it used?

Pin 1 (SLEW) accepts an external capacitor to control the linear ramp rate of both outputs during power-up. A 33 nF capacitor yields 469 V/s for VOUT1 (3.3 V), ensuring ESD-safe, overshoot-free startup. The SLEW pin must not be left floating - it must connect to GND via the specified capacitor.

Is the NCV8509PDW18R2G qualified for automotive applications, and what standards does it meet?

Yes, the NCV8509PDW18R2G is AEC-Q100 qualified (Grade 1, −40 °C to +125 °C ambient), PPAP-capable, and manufactured in an IATF 16949-certified facility. It meets automotive transient requirements including ISO 7637-2 Pulse 5a (50 V load dump) and supports full-lifecycle traceability for OEM production programs.