My Inquiry
My Account
onsemi NCP5661MN18T2G
- Part No.:
- NCP5661MN18T2G
- Manufacturer:
- onsemi
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
NCP5661MN18T2G.pdf
- Description:
- IC REG LINEAR 1.8V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,107
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
NCP5661MN18T2G from onsemi is a fixed-output, 1.8 V, 1.0 A ultra-fast low-dropout linear regulator in a thermally robust DFN6 3×3.3 mm package. It delivers ±1% output accuracy over −40°C to +125°C, features enable control and error flag output, and supports high-current post-regulation in servers and networking equipment with dropout as low as 1.0 V at full load.
For engineers reviewing the NCP5661MN18T2G datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.0 A continuous output, 26 µVrms noise without bypass capacitor, 1.0 V typical dropout at 1.0 A, integrated thermal/current protection, and automotive-qualified NCV variant availability.
Technical Context
The NCP5661MN18T2G implements a precision 0.9 V internal reference with feedback loop architecture enabling stable 1.8 V regulation across 10 mA–1.0 A load range. Its ultra-fast transient response (1–3 µs settling) stems from optimized internal compensation and low ground current (1.3–3.0 mA), independent of load.
It integrates an open-drain Error Flag (Pin 6) that asserts low when output falls below 88% of nominal (1.584 V), requiring a 100 kΩ pull-up. The Enable input (Pin 1) has logic-compatible thresholds (VEN(H) = 1.3 V, VEN(L) = 0.3 V) and sub-0.5 µA leakage, supporting low-power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±1% at TJ = 25°C; ±1.5% over −20°C to +125°C - ensures tight rail tolerance for core logic and I/O supplies. |
| Max Output Current | 1.0 A continuous - supports high-current ASIC, FPGA, and processor core rails without external pass devices. |
| Dropout Voltage | 1.0 V typical at 1.0 A (Vin ≥ 2.8 V required) - enables operation from 3.3 V or 5 V sources with minimal headroom loss. |
| Output Noise | 26 µVrms (10 Hz–100 kHz) without bypass capacitor - eliminates need for dedicated noise-filtering caps in space-constrained designs. |
| PSRR | ≥65 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters in multi-rail power systems. |
| Ground Current | 1.3 mA typical at 1.0 A load; ≤3.0 mA max - minimizes quiescent power loss and improves efficiency at light loads. |
| Error Flag Threshold | 88% of VOUT (1.584 V) - provides early fault detection before downstream logic fails, with 50 µs blanking time to ignore transients. |
Pinout & Package
Package: DFN6 (3.0 × 3.3 mm, 0.95 mm pitch, exposed thermal pad), RoHS-compliant, Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Enable (EN) | Active-high digital control input; tie to Vin for always-on operation or ground to disable regulator and reduce IQ to 300 µA. |
| 2, 3 | Input Voltage (VIN) | Primary power input; accepts 2.0–9.0 V; requires 150 µF OSCON input cap for optimal transient immunity. |
| 4, EPAD | Ground (GND) | Power and signal return; EPAD must be soldered to PCB thermal plane for RθJA = 82°C/W performance. |
| 5 | Output Voltage (VOUT) | Regulated 1.8 V supply; stable with ≥10 µF ceramic output cap; ESR < 300 mΩ recommended for electrolytics. |
| 6 | Error Flag (EF) | Open-drain fault indicator; pulls low when VOUT < 1.584 V; requires external 100 kΩ pull-up to VIN for logic-level signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast transient response | 1–3 µs settling time enables stable operation under rapid load steps common in CPU/GPU DVFS events. |
| Low-noise operation without bypass cap | 26 µVrms noise allows clean analog/RF supply generation without adding board area or BOM cost for extra capacitors. |
| Load-independent ground current | ≤3.0 mA max IQ across 0–1.0 A load preserves efficiency in battery-backed or always-on systems. |
| Integrated protection | Thermal shutdown (160°C) and current limiting (1.5 A peak) prevent damage during overload or short-circuit faults. |
| Automotive-grade variant available | NCV5661MN18T2G is AEC-Q100 qualified and PPAP-capable for infotainment and ADAS power rails. |
Applications
| Server Core Rail Regulation | ASIC Power Sequencing |
|---|---|
|
Use Scenario: Providing tightly regulated 1.8 V supply to high-speed SerDes PHYs and memory interfaces in 1U/2U rack servers. IC Role / Device Role / Timing Role: Final-stage LDO delivering low-noise, fast-transient power to sensitive high-speed logic blocks. Use Value: 26 µVrms noise and 1–3 µs response maintain signal integrity and jitter margins under dynamic traffic loads. |
Use Scenario: Powering configurable logic blocks in multi-voltage ASICs where sequencing and fault reporting are mandatory. IC Role / Device Role / Timing Role: Enable-controlled, monitored LDO with Error Flag for system-level power health monitoring. Use Value: Integrated EN and EF pins eliminate need for external supervisors, reducing component count and board footprint. |
| Networking Equipment Post-Regulation | Gaming Console SoC Core Supply |
|
Use Scenario: Post-regulating switched-mode outputs (e.g., 3.3 V buck) to deliver clean 1.8 V for packet processing units and switch fabric I/O. IC Role / Device Role / Timing Role: High-PSRR (≥65 dB @ 1 kHz), low-dropout regulator suppressing ripple from upstream DC/DC converters. Use Value: 65 dB PSRR and 1.0 V dropout allow use with 3.3 V intermediate bus while maintaining >90% efficiency at full load. |
Use Scenario: Supplying GPU shader cores and video codec accelerators in consumer gaming consoles requiring reliable low-voltage operation. IC Role / Device Role / Timing Role: Thermally robust (RθJA = 82°C/W) 1.0 A LDO with thermal shutdown for sustained burst-mode workloads. Use Value: Exposed thermal pad and 160°C thermal shutdown ensure safe operation during extended gameplay sessions without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS7A4700RGWR | Adjustable (1.4–20 V), lower IQ (1.1 mA), higher PSRR (70 dB @ 1 kHz), but only 500 mA output. | Lacks fixed 1.8 V option and Error Flag; suited for precision analog biasing, not high-current digital rails. | Select when ultra-low noise (<4 µVrms) and adjustable output outweigh need for 1.0 A and fault reporting. |
| STMicroelectronics LD39115PU18R | Fixed 1.8 V, 1.2 A, 200 mV dropout, but no Error Flag and higher noise (45 µVrms). | Optimized for mobile apps with ultra-low dropout; lacks fault signaling needed for server/networking diagnostics. | Prefer for portable devices where minimum input voltage (1.8 V + 0.2 V) is critical and fault reporting is non-essential. |
Compared with TPS7A4700RGWR and LD39115PU18R, the NCP5661MN18T2G uniquely balances 1.0 A output, integrated Error Flag, 26 µVrms noise, and automotive-qualified variants-making it optimal for infrastructure-grade digital power where reliability, diagnostics, and transient performance are co-prioritized.
Availability
NCP5661MN18T2G is available at Aetrix Electronics and suitable for server power supplies, ASIC post-regulation, and networking equipment requiring stable component supply, long-term lifecycle support, and automotive-grade alternatives.
Supply support for NCP5661MN18T2G 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 management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The NCP5661 series was designed for high-current, low-noise linear regulation in demanding infrastructure applications-including servers, networking gear, and automotive ECUs-where fast transient response and integrated fault signaling are essential.
FAQ
What is the maximum input voltage rating for the NCP5661MN18T2G?
The NCP5661MN18T2G has an absolute maximum input voltage (VIN) of 18 V per its datasheet. However, for reliable operation within specifications, the recommended input range is 2.0 V to 9.0 V. Operating above 9.0 V may exceed thermal limits or degrade long-term reliability, even if within absolute max ratings.
Does the NCP5661MN18T2G require an external bypass capacitor for low-noise operation?
No, the NCP5661MN18T2G achieves 26 µVrms output noise (10 Hz–100 kHz) without any external bypass capacitor. This is enabled by its internal low-noise architecture and 0.9 V reference design, eliminating the need for additional capacitance and saving PCB area and BOM cost.
How does the Error Flag pin on the NCP5661MN18T2G function, and what external components are needed?
The Error Flag (Pin 6) is an open-drain output that pulls low when VOUT drops below 88% of nominal (1.584 V). It requires an external 100 kΩ pull-up resistor to VIN to generate a logic-high signal during normal operation. No pull-up is needed if the flag is unused, but the pin must remain unconnected-not tied to GND or VIN.
What thermal performance can be expected from the NCP5661MN18T2G in a standard PCB layout?
In a standard layout with 1 oz copper and 1 in² thermal pad area, the NCP5661MN18T2G achieves RθJA = 82°C/W. With proper thermal vias to inner layers, junction temperature rise remains within safe limits up to ~1.0 A at ambient ≤85°C - verified by onsemi's DFN6 thermal resistance vs. copper area curves (Figure 18).
Is there an automotive-qualified version of the NCP5661MN18T2G, and what certifications does it hold?
Yes, the NCV5661MN18T2G is the automotive-qualified variant of the NCP5661MN18T2G. It is AEC-Q100 Grade 1 qualified (−40°C to +125°C) and PPAP-capable, meeting stringent automotive reliability and process control requirements for infotainment, body control, and ADAS subsystems.
NCP5661MN18T2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 9V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 3 mA
- Current - Supply (Max):
- -
- PSRR:
- 70dB ~ 65dB (120Hz ~ 1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (3x3.3)
NCP5661MN18T2G FAQ
1.How can I place an order for NCP5661MN18T2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP5661MN18T2G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for NCP5661MN18T2G reliable?
The price and inventory of NCP5661MN18T2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP5661MN18T2G is usually 5 days.
3.What payment methods are accepted for NCP5661MN18T2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP5661MN18T2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP5661MN18T2G?
NCP5661MN18T2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP5661MN18T2G order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for NCP5661MN18T2G?
For technical support, including NCP5661MN18T2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP5661MN18T2G requirements.
6.How does Aetrix verify that NCP5661MN18T2G is sourced from the original manufacturer or authorized distributors?
All NCP5661MN18T2G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that NCP5661MN18T2G meets industry standards.
7.What is the process for return or replacement of NCP5661MN18T2G?
All NCP5661MN18T2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP5661MN18T2G, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The NCP5661MN18T2G part is unused and in its original packaging.
Return procedure for NCP5661MN18T2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NCP5661MN18T2G Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
