onsemi NCV571MN08TBG

Overview

NCV571MN08TBG from onsemi is an automotive-grade CMOS low-dropout linear regulator delivering a fixed 0.8 V output at up to 150 mA, with ultra-low 4.0 µA typical quiescent current, ±3% output voltage accuracy at 25°C, and operation across −40°C to +125°C ambient. It integrates PMOS pass transistor, thermal shutdown, current limit, and enable control - deployed in battery-powered infotainment modules, ADAS sensor power rails, and engine control unit (ECU) auxiliary supplies.

For engineers reviewing the NCV571MN08TBG datasheet, pinout, applications, or equivalent options, key selection criteria include its 0.8 V fixed output, DFN6 package thermal performance (R_JA = 190°C/W), AEC-Q100 qualification, and enable-input logic threshold (1.3 V high, 0.3 V low) for controlled power sequencing in automotive systems.

Technical Context

The NCV571MN08TBG implements a PMOS-based LDO architecture with internal voltage reference, error amplifier, and protection circuitry - enabling stable regulation without external compensation. Its ultra-low I_Q supports always-on subsystems, while the enable input allows precise system-level power gating.

Designed for automotive environments, it features integrated thermal shutdown and current limiting, operates from 0.8 V + dropout up to 12 V input, and maintains ±4% output accuracy over full −40°C to +125°C temperature range - meeting stringent ECU and body electronics supply requirements.

Key Specifications

Pinout & Package

NCV571MN08TBG is housed in a Pb-free 6-pin DFN package (2.0 × 2.2 mm, 0.65 mm pitch) with exposed thermal pad (EP) for enhanced heat dissipation. The package complies with AEC-Q100 Grade 1 and supports reflow soldering per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCV571MN08TBG, TLV70033DCKR lacks automotive qualification and offers higher I_Q and mismatched output voltage, while TPS78001QDRVRQ1 matches output and qualification but achieves significantly lower quiescent current - making it suitable for deeper sleep modes where 4.0 µA is insufficient.

Availability

NCV571MN08TBG is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and engine control units requiring stable component supply with AEC-Q100 compliance and long-term production continuity.

Supply support for NCV571MN08TBG 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 NCV571 series belongs to onsemi's automotive-qualified linear regulator product line, engineered specifically for demanding vehicle subsystems requiring ultra-low quiescent current, wide temperature operation, and robust protection features.

FAQ

What is the output voltage tolerance of the NCV571MN08TBG over its full operating temperature range?

The NCV571MN08TBG maintains a fixed 0.8 V output with ±4% tolerance across its full automotive operating ambient temperature range of −40°C to +125°C, as specified in the Electrical Characteristics table for the NCV571 variant. This tighter tolerance than commercial-grade NCP571 (±4% vs. ±3% at 25°C only) ensures reliable power delivery to sensitive automotive loads under extreme thermal conditions. The NCV571MN08TBG achieves this via process and design optimizations validated per AEC-Q100 stress testing protocols.

Does the NCV571MN08TBG require an external output capacitor, and what is the minimum value?

Yes, the NCV571MN08TBG requires an external output capacitor for stability and transient response, with a minimum value of 0.1 µF ceramic. The datasheet explicitly states the device is stable with low-ESR ceramic capacitors and does not require specific ESR ranges or minimum load currents. Larger values improve noise rejection and load transient performance, and the regulator accepts both ceramic and tantalum types - making the NCV571MN08TBG compatible with compact, cost-effective decoupling schemes in space-constrained automotive PCBs.

How is the enable function implemented on the NCV571MN08TBG, and what are its voltage thresholds?

The NCV571MN08TBG uses an active-high enable input (pin 4) with a logic-high threshold of 1.3 V (typical) to turn on regulation and a logic-low threshold of 0.3 V (typical) to disable the output and reduce quiescent current to <0.1 µA. When unused, the enable pin must be tied to V_IN; floating is prohibited. If driven by a higher-voltage logic source (e.g., 5 V), a resistor divider is required to keep V_EN ≤ V_IN + 0.3 V, as specified in the Absolute Maximum Ratings. This behavior is confirmed in the PIN FUNCTION DESCRIPTION and ELECTRICAL CHARACTERISTICS sections of the NCV571MN08TBG datasheet.

Is the NCV571MN08TBG pin-compatible with other members of the NCV571 family?

Yes, all NCV571 variants in the DFN6 package - including NCV571MN08TBG, NCV571MN09TBG, NCV571MN10TBG, and NCV571MN12TBG - share identical pinout, package dimensions, and thermal pad layout per Case 506BA. This allows board-level reuse across different output voltages without layout changes, provided the output capacitor and enable configuration remain compatible. The TSOP-5 variants (e.g., NCV571SN08T1G) use a different pin assignment and are not pin-compatible with the NCV571MN08TBG.

What thermal derating applies to the NCV571MN08TBG in a standard 1 oz copper PCB layout?

For the NCV571MN08TBG in its DFN6 package mounted on a standard 1 oz copper PCB with 100 mm² copper area, the junction-to-ambient thermal resistance (R_JA) is 190°C/W. At 85°C ambient temperature and maximum junction temperature of 125°C, the maximum allowable power dissipation is (125 − 85) / 190 ≈ 210 mW. With a 0.8 V output and 150 mA load, power dissipation is (V_IN − 0.8 V) × 0.15 A - so V_IN must be ≤ ~2.2 V to stay within thermal limits at 85°C ambient. Higher input voltages require increased copper area or forced airflow to maintain reliability.