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onsemi NCP5661DT25RKG
- Part No.:
- NCP5661DT25RKG
- Manufacturer:
- onsemi
- Package:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Datasheet:
-
NCP5661DT25RKG.pdf
- Description:
- IC REG LINEAR 2.5V 1A DPAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,761
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Product details
Overview
NCP5661DT25RKG from onsemi is a fixed-output, 2.5 V, 1.0 A low-dropout linear regulator in DPAK-5 package, featuring ultra-fast transient response (1–3 µs settling), 26 µVrms output noise without bypass capacitor, and integrated Enable/ Error Flag functions. It delivers stable post-regulation for ASIC power supplies and networking equipment under high-current, low-voltage conditions.
For engineers reviewing the NCP5661DT25RKG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 1.0 A (1.0–1.3 V), ground current independence from load (≤3.0 mA), thermal shutdown at 160°C, error flag threshold (88% of VOUT), and Pb-free DPAK-5 mechanical compatibility.
Technical Context
The NCP5661DT25RKG implements a precision 0.9 V internal reference with adjustable feedback architecture repurposed for fixed 2.5 V output via internal resistor divider. Its error flag circuitry monitors regulated output voltage and asserts logic-low when VOUT falls below 88% of nominal (2.2 V), requiring an external 100 kΩ pull-up to VIN.
Designed for high-current LDO applications, it combines low ground current (≤3.0 mA at full load) with thermally robust DPAK-5 packaging (RθJA = 100°C/W, RθJC = 8.0°C/W), enabling operation up to +150°C junction temperature while maintaining 65 dB PSRR at 1 kHz and 70 dB at 120 Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±1% at 25°C; ±2% over −40°C to +150°C operating range |
| Max Output Current | 1.0 A continuous; internal current limit clamps at 1.5 A to prevent thermal runaway |
| Dropout Voltage | 1.0 V typical (max 1.3 V) at 1.0 A load - enables operation with only 3.5 V input for 2.5 V output |
| Ground Current | ≤3.0 mA at 1.0 A load - independent of output current, minimizing quiescent power loss |
| Noise (10 Hz–100 kHz) | 26 µVrms - eliminates need for external bypass capacitor in noise-sensitive analog rails |
| PSRR | ≥65 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters |
| Error Flag Threshold | 88% of VOUT (2.2 V) - provides early warning of output collapse before system reset |
| Enable Threshold | Logic-high ≥1.3 V, logic-low ≤0.3 V - compatible with standard CMOS/TTL control signals |
Pinout & Package
DPAK-5 (Case 175AA) package with exposed thermal tab (Pin 3/TAB) for enhanced heat dissipation; 5-pin surface-mount outline measuring 6.4 mm × 5.8 mm × 1.8 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Enable (EN) | Active-high digital control: tie to GND to disable regulator; floating or tied to VIN enables operation |
| 2 | Input (VIN) | Main power input (2.0–9.0 V); requires 150 µF OSCON input capacitor for optimal transient response |
| 3 | Ground / Thermal Tab (GND) | Power ground return and primary thermal path; must be soldered to large copper pour for RθJC = 8.0°C/W |
| 4 | Output (VOUT) | Regulated 2.5 V output; stable with ≥10 µF output capacitance and ESR < 300 mΩ |
| 5 | Error Flag (EF) | Open-drain output asserting logic-low when VOUT < 2.2 V; requires external 100 kΩ pull-up to VIN |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast transient response | 1–3 µs settling time minimizes voltage droop during sudden load steps in server CPU cores |
| Low-noise operation | 26 µVrms noise without bypass cap simplifies layout for RF/analog subsystems |
| Load-independent ground current | 3.0 mA max across 0–1.0 A load preserves efficiency in battery-backed systems |
| Integrated error flag | Monitors regulation status at pin 5 with 50 µs blanking time to ignore benign transients |
| Thermal protection | Guaranteed 160°C shutdown prevents damage during sustained overload or poor heatsinking |
| Pb-free DPAK-5 packaging | RoHS-compliant leadframe with center-lead crop improves thermal performance vs. standard TO-252 |
Applications
| ASIC Power Supply | Networking Equipment |
|---|---|
Use Scenario: Providing clean, low-noise 2.5 V bias to high-speed SerDes PHYs and memory interfaces in 10G/25G Ethernet switches. IC Role / Device Role / Timing Role: Post-regulator delivering stable voltage after primary DC-DC conversion; maintains tight tolerance during burst-mode traffic loads. Use Value: 1.0 A capability and 1.0 V dropout enable use with 3.3 V intermediate bus; 26 µVrms noise avoids jitter accumulation in clock recovery circuits. | Use Scenario: Powering FPGA configuration banks and management controllers in telecom line cards requiring fault visibility. IC Role / Device Role / Timing Role: Primary 2.5 V supply with real-time health monitoring via open-drain error flag signal. Use Value: Error flag assertion at 88% VOUT allows host processor to initiate graceful shutdown before brownout resets occur. |
| Server Baseboard Management | Gaming STB Modules |
Use Scenario: Delivering 2.5 V to BMC microcontrollers and sensor interfaces where thermal margin is constrained by dense component layout. IC Role / Device Role / Timing Role: Thermally robust LDO using DPAK-5 exposed tab for direct PCB copper conduction; operates up to +150°C junction. Use Value: RθJC = 8.0°C/W enables >1 W power dissipation with minimal board-level heatsinking - critical for fanless edge servers. | Use Scenario: Regulating 2.5 V for HDMI transmitter ICs and audio codecs in set-top boxes subject to rapid ambient temperature swings. IC Role / Device Role / Timing Role: High-accuracy LDO maintaining ±2% output over −40°C to +150°C junction range without external trimming. Use Value: 0.9 V internal reference and laser-trimmed resistors ensure long-term stability across thermal cycling and product lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4700RGWR | 2.5 V fixed, 1.0 A, 26 µVrms noise, but requires external bypass capacitor; higher dropout (1.1 V typ at 1 A) | Lacks integrated error flag; no built-in fault reporting for system-level monitoring | Choose when ultra-low noise is required with external capacitor budget, and error flag is not needed |
| MCP1826T-2502E/DB | 2.5 V fixed, 1.0 A, 45 µVrms noise, 1.2 V dropout at 1 A, no error flag, DFN-8 package | Higher noise and no fault indicator; smaller DFN-8 footprint limits thermal handling | Choose for space-constrained designs where thermal load is moderate and fault detection is handled externally |
Compared with TPS7A4700RGWR and MCP1826T-2502E/DB, the NCP5661DT25RKG uniquely integrates error flag reporting and achieves 26 µVrms noise without bypass capacitor - enabling simpler, more reliable power delivery in thermally demanding, safety-critical infrastructure applications.
Availability
NCP5661DT25RKG is available at Aetrix Electronics and suitable for server baseboard management, ASIC power supplies, and networking equipment requiring stable component supply, automotive-grade traceability (NCV variant available), and long-lifecycle support.
Supply support for NCP5661DT25RKG 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 consumer markets.
The NCP5661DT25RKG belongs to onsemi's high-current LDO family designed specifically for post-regulation in high-performance computing and communications infrastructure where ultra-low noise, fast transient response, and integrated fault signaling are mandatory.
FAQ
What is the maximum input voltage rating for the NCP5661DT25RKG?
The NCP5661DT25RKG has an absolute maximum input voltage rating of 18 V. However, its recommended operating input range is 2.0 V to 9.0 V per electrical characteristics. Exceeding 9.0 V may degrade long-term reliability or trigger thermal shutdown under load, even if within absolute maximum ratings.
Does the NCP5661DT25RKG require an external bypass capacitor to achieve its specified 26 µVrms noise performance?
No, the NCP5661DT25RKG achieves 26 µVrms output noise (10 Hz–100 kHz) without any external bypass capacitor. This is enabled by its internal low-noise architecture and is verified in the datasheet's Electrical Characteristics table for both adjustable and fixed-output versions including NCP5661DT25RKG.
How does the error flag function on the NCP5661DT25RKG behave during startup and load transients?
The NCP5661DT25RKG error flag includes a 50 µs blanking time (Tef) to suppress false triggers during normal startup ramp-up and brief load transients. It asserts logic-low only when VOUT remains below 88% of nominal (2.2 V) beyond this window - ensuring reliable fault detection without nuisance alarms.
What thermal performance can be expected from the NCP5661DT25RKG in a standard 1 oz copper PCB layout?
In a standard layout with 1 oz copper and minimum 0.26 in² copper area (as defined in datasheet Note 1), the NCP5661DT25RKG exhibits RθJA = 100°C/W. At 1.0 A load with 1.0 V dropout (1.0 W dissipation), this yields ~100°C rise above ambient - confirming the need for adequate copper pour or forced air in high-temperature environments.
Is the NCP5661DT25RKG pin-compatible with other members of the NCP5661 family such as the adjustable version?
No, the NCP5661DT25RKG is not pin-compatible with the adjustable version (e.g., NCP5661DTADJRKG). The fixed-output variant uses Pin 5 as Error Flag, whereas the adjustable version uses Pin 5 as ADJ. Swapping them would cause functional failure - correct part selection and layout verification per datasheet marking diagrams are essential.
NCP5661DT25RKG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- 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):
- 2.5V
- 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:
- DPAK-5
NCP5661DT25RKG FAQ
1.How can I place an order for NCP5661DT25RKG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP5661DT25RKG 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 NCP5661DT25RKG reliable?
The price and inventory of NCP5661DT25RKG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP5661DT25RKG is usually 5 days.
3.What payment methods are accepted for NCP5661DT25RKG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP5661DT25RKG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP5661DT25RKG?
NCP5661DT25RKG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP5661DT25RKG 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 NCP5661DT25RKG?
For technical support, including NCP5661DT25RKG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP5661DT25RKG requirements.
6.How does Aetrix verify that NCP5661DT25RKG is sourced from the original manufacturer or authorized distributors?
All NCP5661DT25RKG 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 NCP5661DT25RKG meets industry standards.
7.What is the process for return or replacement of NCP5661DT25RKG?
All NCP5661DT25RKG units undergo pre-shipment inspection (PSI). If there is an issue with NCP5661DT25RKG, 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 NCP5661DT25RKG part is unused and in its original packaging.
Return procedure for NCP5661DT25RKG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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