onsemi NCV8664CDT50RKG

Overview

NCV8664CDT50RKG from onsemi is a precision 5.0 V fixed-output, low-dropout linear voltage regulator delivering up to 150 mA output current with 22 µA typical quiescent current and 600 mV maximum dropout at full load. It features ±2.0% output accuracy over −40°C to +150°C and operates across a 4.5 V to 45 V input range. Designed for automotive body control modules requiring ultra-low standby power.

For engineers reviewing the NCV8664CDT50RKG datasheet, pinout, applications, or equivalent options, key selection criteria include AEC-Q100 qualification, reverse-voltage protection down to −42 V, thermal shutdown at 150°C, and compatibility with 10 µF ceramic output capacitors in space-constrained automotive PCB layouts.

Technical Context

The NCV8664CDT50RKG uses a PNP pass transistor controlled by a bandgap-referenced error amplifier to maintain tight regulation. Its internal foldback current limiting activates during overcurrent events, reducing output current to limit power dissipation while preserving fault tolerance.

Thermal shutdown triggers at 150°C (guaranteed by design), and reverse-voltage protection withstands −42 V on VIN. The device requires no external compensation components and achieves stability with a minimum 10 µF ceramic output capacitor for the 5.0 V version.

Key Specifications

Pinout & Package

DPAK (TO-252-3) package with exposed tab for thermal conduction; 3.1 mm × 6.5 mm footprint, 2.28 mm height, Pb-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-I_Q automotive LDO applications.

Compared with NCV8664CST50T3G, the NCV8664CDT50RKG offers superior thermal resistance (87.4°C/W vs. 109°C/W) in the same DPAK footprint, enabling higher ambient operation in compact ECUs; versus TLV73350PDBVR, it trades ultra-low I_Q for automotive-grade ruggedness, wide-input capability, and AEC-Q100 compliance - essential for under-hood deployment.

Availability

NCV8664CDT50RKG is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera power supplies, and engine control units requiring stable component supply across long product lifecycles.

Supply support for NCV8664CDT50RKG 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 supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCV8664C series belongs to onsemi's automotive-qualified linear regulator portfolio, engineered specifically for robust, low-quiescent-current power management in harsh-temperature, high-reliability vehicle subsystems.

FAQ

What is the maximum input voltage rating for the NCV8664CDT50RKG?

The NCV8664CDT50RKG supports a DC input voltage range of 4.5 V to 45 V, with absolute maximum rating of +45 V and reverse-voltage tolerance down to −42 V. This enables direct connection to automotive batteries while surviving load-dump transients per ISO 7637-2 Pulse 5a and cold-crank conditions.

Does the NCV8664CDT50RKG require an external output capacitor, and what type is recommended?

Yes, the NCV8664CDT50RKG requires a minimum 10 µF ceramic output capacitor for stability, as confirmed in Figure 2 and Table 1 of the datasheet. Tantalum or aluminum electrolytic capacitors are acceptable alternatives, but ceramic is preferred for low ESR, small size, and guaranteed stability across −40°C to +125°C.

Is the NCV8664CDT50RKG pin-compatible with the NCV4264-2C?

Yes, the NCV8664CDT50RKG is explicitly stated as pin- and functionally compatible with the NCV4264-2C, making it a drop-in replacement when lower quiescent current (22 µA vs. ~100 µA) is required without layout changes - verified in the "Features" section and "Ordering Information" table of the datasheet.

What thermal performance can be expected from the NCV8664CDT50RKG in a standard 1 oz copper PCB layout?

In a standard layout with 100 mm² copper area (1 oz), the NCV8664CDT50RKG exhibits a junction-to-ambient thermal resistance (R_JA) of 87.4°C/W, as specified in the "Thermal Resistance" table. This allows continuous 150 mA output at up to +85°C ambient if input-to-output differential is ≤1.5 V, per thermal calculations in Section 9 of the datasheet.

How does the foldback current limiting in the NCV8664CDT50RKG protect the device during a short circuit?

The NCV8664CDT50RKG implements foldback current limiting that reduces short-circuit output current to 100–500 mA (typical 100 mA) when V_OUT = 0 V, significantly lowering power dissipation compared to constant-current limiting. This prevents thermal runaway and enables safe, indefinite short-circuit survival at moderate ambient temperatures - detailed in the "Protection" section and Figure 1 block diagram.