onsemi NCV663SQ15T1G

Overview

NCV663SQ15T1G from onsemi is an automotive-grade, fixed-output 1.5 V low-dropout linear regulator with ultra-low quiescent current (2.5 µA typical), ±2.0% output voltage accuracy, and operation over −40 °C to +125 °C. It delivers up to 100 mA output current with a dropout voltage of 680 mV at 100 mA and is housed in the SC-82AB surface-mount package for space-constrained battery-powered infotainment systems.

For engineers reviewing the NCV663SQ15T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 qualification, absence of enable functionality (N/C pin), ceramic-capacitor compatibility (≥0.1 µF), and thermal performance in automotive ambient conditions.

Technical Context

The NCV663SQ15T1G uses a PMOS pass transistor architecture enabling low dropout and stable regulation without requiring minimum load current. Its internal protection includes thermal shutdown (typically 160 °C) and current limiting (150–600 mA short-circuit current), with no external enable control-pin 4 is internally unconnected.

Designed specifically for automotive applications, it features enhanced process control per PPAP requirements and operates across the full −40 °C to +125 °C junction temperature range. The device achieves 100 ppm/°C output voltage temperature coefficient and supports input voltages from 1.8 V to 6.0 V while maintaining regulation at 1.5 V output.

Key Specifications

Pinout & Package

The NCV663SQ15T1G is packaged in the SC-82AB (Case 419C) surface-mount package: 2.0 mm × 1.25 mm × 0.95 mm body, 4-pin configuration, Pb-free, with exposed thermal pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-quiescent-current LDO applications.

Compared with NCV663SQ15T1G, NCV8170ASN150T1G offers higher current and enable control but shares identical automotive qualification and package; TLV73315PDBVR provides greater current headroom and enable flexibility but sacrifices automotive compliance and ultra-low I_Q.

Availability

NCV663SQ15T1G is available at Aetrix Electronics and suitable for automotive infotainment, telematics control units, ADAS camera modules, and body control modules requiring stable component supply under AEC-Q100-compliant sourcing.

Supply support for NCV663SQ15T1G 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 power, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The NCV663 series belongs to onsemi's automotive-qualified LDO portfolio, designed specifically to meet stringent AEC-Q100 Grade 1 requirements and support low-power, high-reliability functions in infotainment, ADAS, and body electronics.

FAQ

What is the maximum input voltage rating for the NCV663SQ15T1G?

The NCV663SQ15T1G has a maximum input voltage rating of 6.0 V, as specified in the Absolute Maximum Ratings table. This allows safe operation during automotive load-dump transients when paired with appropriate front-end clamping. Exceeding 6.0 V may cause permanent damage. The device maintains regulation down to Vin = Vout + dropout (i.e., ≥2.18 V for 1.5 V output at 100 mA), making NCV663SQ15T1G suitable for wide-input applications such as 12 V battery-derived rails with pre-regulation.

Does the NCV663SQ15T1G include an enable pin?

No, the NCV663SQ15T1G does not include an enable pin. Pin 4 is designated N/C (No Connection) and must remain unconnected-neither pulled high nor low. Unlike the NCV662 variant, which features an active-high enable input on pin 4, the NCV663 family replaces that function with a no-connect terminal. Therefore, NCV663SQ15T1G operates continuously when powered; external switching must be implemented upstream of Vin if ON/OFF control is required.

What output capacitor value is required for stable operation of the NCV663SQ15T1G?

The NCV663SQ15T1G requires a minimum output capacitance of 0.1 µF, and ceramic capacitors are fully supported. The datasheet confirms stability across ESR values from a few milliohms up to 10 Ω, eliminating the need for specialized high-ESR types. For optimal transient response-especially in automotive applications with fast load steps-a 1.0 µF X5R/X7R ceramic capacitor placed within 2 mm of pins 1 (GND) and 3 (VOUT) is recommended. This ensures NCV663SQ15T1G meets load regulation specs (<40 mV deviation from 10 mA to 100 mA) and maintains low noise performance.

Is the NCV663SQ15T1G still in active production?

No, the NCV663SQ15T1G is marked as discontinued in the official onsemi datasheet (Rev. 5, November 2025). Page 8 explicitly lists "NCV663SQ15T1G*" under "DISCONTINUED" with note 5 stating these devices are no longer available. However, Aetrix Electronics maintains limited legacy inventory and supports last-time-buy programs, traceable sourcing, and cross-reference assistance for qualified replacements such as NCV8170ASN150T1G where functional and qualification alignment permits.

What is the thermal shutdown threshold of the NCV663SQ15T1G?

The NCV663SQ15T1G incorporates internal thermal protection that activates at approximately 160 °C junction temperature, as defined in the Definitions section of the datasheet. Once triggered, the regulator shuts down output until junction temperature falls below the hysteresis threshold (typically ~140 °C). This feature protects against permanent damage during sustained overload, inadequate PCB copper pour, or high ambient temperatures. The SC-82AB package has a junction-to-ambient thermal resistance (R_JA) of 330 °C/W, so NCV663SQ15T1G can dissipate ~300 mW at 25 °C ambient before reaching thermal limit under natural convection.