onsemi NCV5661MN15T2G

Overview

NCV5661MN15T2G from onsemi is an automotive-grade, fixed-output 1.5 V, 1.0 A low-dropout linear regulator in a thermally robust DFN6 3×3.3 mm package. It delivers ultra-fast load transient response (1–3 µs settling), 26 µV_rms output noise without bypass capacitor, and dropout voltage of 1.0 V (typ) at 1.0 A - enabling stable post-regulation for ASICs and networking equipment in harsh environments.

For engineers reviewing the NCV5661MN15T2G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 qualification, error flag functionality (active-low, 88% V_OUT threshold), thermal shutdown at 160°C, ±1% output accuracy over −40°C to +125°C, and compatibility with low-ESR ceramic output capacitors ≥10 µF.

Technical Context

The NCV5661MN15T2G implements a precision 0.9 V internal reference with adjustable feedback architecture repurposed for fixed 1.5 V output via internal resistor divider. Its control loop is optimized for stability with minimal external components: only input (150 µF OSCON) and output (≥10 µF, ESR < 300 mΩ) capacitors are required.

It integrates enable logic with 1.3 V rising-edge turn-on threshold and 0.3 V falling-edge disable threshold, plus an open-drain error flag (Pin 5) that asserts low when output falls below 88% of nominal 1.5 V (i.e., ≤1.32 V), requiring a 100 kΩ pull-up to VIN. Thermal protection triggers at 160°C with automatic recovery.

Key Specifications

Pinout & Package

NCV5661MN15T2G uses the DFN6 3.0×3.3 mm, 0.95 mm pitch package (Case 506AX) with exposed thermal pad (EPAD) connected to Pin 3 (GND). This compact, surface-mount package delivers R_θJA = 82°C/W (1 in² copper) and supports high-power density designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73315PDBVR and TPS7A2015PDQNR, the NCV5661MN15T2G uniquely combines 1.0 A output, AEC-Q100 qualification, integrated error flag, and 1.0 V dropout - making it the only option for safety-critical, high-current automotive or industrial LDO applications demanding diagnostics and thermal resilience.

Availability

NCV5661MN15T2G is available at Aetrix Electronics and suitable for automotive ADAS systems, industrial PLCs, networking switch ASICs, and medical imaging front-ends requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.

Supply support for NCV5661MN15T2G 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, cloud, and IoT markets.

The NCV5661 series belongs to onsemi's high-current LDO portfolio, engineered specifically for automotive and industrial applications demanding AEC-Q100 qualification, ultra-low noise, fast transient response, and robust thermal performance under sustained 1.0 A loads.

FAQ

What is the maximum input voltage rating for the NCV5661MN15T2G?

The NCV5661MN15T2G has an absolute maximum input voltage (V_IN) of 18 V, but its recommended operating range is 2.0 V to 9.0 V per the Electrical Characteristics table. Exceeding 9.0 V may degrade long-term reliability or trigger thermal shutdown under high load. Always maintain V_IN − V_OUT ≥ 1.5 V for guaranteed dropout performance. The NCV5661MN15T2G is rated for continuous operation up to 9.0 V input in automotive and industrial environments.

Does the NCV5661MN15T2G require an external bypass capacitor for low-noise operation?

No, the NCV5661MN15T2G achieves 26 µV_rms output noise (10 Hz–100 kHz) without any external bypass capacitor - a key differentiator versus most LDOs. This eliminates one BOM item and associated PCB footprint. However, a minimum 10 µF ceramic output capacitor (low ESR < 300 mΩ) is mandatory for stability, and a 150 µF OSCON input capacitor is recommended for optimal transient response. The NCV5661MN15T2G's internal architecture enables this capacitor-free noise performance.

How does the error flag function on the NCV5661MN15T2G, and what external components are needed?

The NCV5661MN15T2G's Error Flag (Pin 5) is an open-drain output that pulls low when V_OUT drops below 88% of nominal (≤1.32 V for 1.5 V output), with blanking time of 50 µs to ignore transients. It requires an external 100 kΩ pull-up resistor to VIN for proper logic-level signaling. No pull-up is needed if the flag is unused. The NCV5661MN15T2G error flag supports system-level fault detection and logging in automotive ECUs without additional supervisory ICs.

What thermal derating applies to the NCV5661MN15T2G in a DFN6 package?

In the DFN6 3×3.3 mm package (Case 506AX), the NCV5661MN15T2G has R_θJA = 82°C/W with 1 in² copper area. At 1.0 A load and 1.0 V dropout, power dissipation is ~1.0 W - resulting in ~82°C junction rise above ambient. To stay within the −40°C to +150°C junction limit, ambient must remain ≤68°C with that copper area. Increasing copper area or adding thermal vias to inner layers reduces R_θJA; the NCV5661MN15T2G's EPAD must be soldered to GND plane for effective heat transfer.

Is the NCV5661MN15T2G pin-compatible with other variants in the NCV5661 family?

Yes - all DFN6-packaged NCV5661 variants (e.g., NCV5661MN12T2G, NCV5661MN18T2G, NCV5661MNADJT2G) share identical pinout and footprint. The NCV5661MN15T2G differs only in internal feedback network (fixed 1.5 V) and marking; no PCB redesign is needed when substituting between fixed-output DFN6 versions. However, the adjustable version (NCV5661MNADJT2G) uses Pin 6 as ADJ instead of EF, so swapping requires schematic and firmware updates for flag handling.