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onsemi NCP1117DT15RK
- Part No.:
- NCP1117DT15RK
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
NCP1117DT15RK.pdf
- Description:
- IC REG LINEAR 1.5V 1A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,036
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Product details
Overview
NCP1117DT15RK from onsemi is a 1.5 V fixed-output, low-dropout linear voltage regulator in DPAK (TO-252) package, delivering up to 1.0 A output current with 1.2 V max dropout at 800 mA and ±1.0% output voltage accuracy over temperature. It operates from 2.9 V to 11.5 V input and requires no minimum load for regulation - used in point-of-load power for hard drive controllers and switching supply post-regulation.
For engineers reviewing the NCP1117DT15RK datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at full load, thermal performance in DPAK layout, quiescent current (4.2 mA typ), ripple rejection (66 dB at 120 Hz), and compatibility with 10 µF ceramic output capacitance.
Technical Context
The NCP1117DT15RK employs an internal bandgap reference trimmed to ±1.0%, driving a PNP pass transistor with safe-operating-area compensation and thermal shutdown activation at ~175°C. Its three-terminal architecture supports direct Kelvin sensing via remote ground connection for improved load regulation.
It integrates overcurrent limiting and features internal protection diodes between VIN–VOUT and ADJ–VOUT, enabling robust operation in transient-heavy environments like battery charger input stages and SCSI termination circuits - without requiring external series diodes unless COUT > 50 µF and VIN is shorted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±1.0% (ensures stable core logic or low-voltage ASIC biasing) |
| Max Output Current | 1.0 A continuous (supports single-rail microcontroller or FPGA I/O banks) |
| Dropout Voltage | 1.2 V max at 800 mA (enables operation from 2.9 V input, e.g., Li-ion battery discharge tail) |
| Input Voltage Range | 2.9 V to 11.5 V (compatible with 3.3 V/5 V intermediate rails and buck converter outputs) |
| Quiescent Current | 4.2 mA typical (minimizes standby power loss in always-on subsystems) |
| Ripple Rejection | 66 dB at 120 Hz (suppresses rectified AC ripple in offline SMPS post-regulators) |
| Thermal Shutdown | ~175°C junction (prevents catastrophic failure during sustained overload or poor heatsinking) |
Pinout & Package
DPAK (TO-252-3) package with exposed metal tab thermally and electrically connected to Pin 2 (Output). Standard 3-pin surface-mount footprint compatible with IPC-7351B DPAK-3 land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground / Adjust | Reference node for internal error amplifier; connects directly to system ground plane for regulation stability |
| 2 | Output | Main regulated 1.5 V supply rail; tab is internally bonded to this pin for enhanced thermal conduction |
| 3 | Input | Unregulated input source (2.9–11.5 V); requires local 10 µF ceramic bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| No minimum load requirement | Maintains regulation down to 0 mA output - eliminates need for bleeder resistors in low-power sleep modes |
| Internal thermal shutdown | Self-protecting under sustained overload or inadequate PCB copper; cycles output instead of failing open/short |
| 1.2 V max dropout at 800 mA | Enables high-efficiency operation from marginal input rails (e.g., 3.3 V LDO fed by buck converter with 100 mV ripple) |
| ±1.0% output accuracy | Meets tight tolerance requirements for DDR memory termination or analog sensor biasing without external trimming |
| 66 dB ripple rejection at 120 Hz | Reduces 120 Hz hum in post-regulated audio or measurement subsystems without additional filtering stages |
Applications
| Hard Drive Controller Power | Switching Supply Post-Regulation |
|---|---|
Use Scenario: Providing clean 1.5 V bias to SATA controller PHY and SERDES circuitry on enterprise HDD PCBs. IC Role / Device Role / Timing Role: Primary low-noise, low-dropout post-regulator ensuring signal integrity and jitter compliance. Use Value: Eliminates need for discrete RC filters while maintaining <10 mV RMS output noise (0.003% VOUT) across 10 Hz–10 kHz bandwidth. | Use Scenario: Final-stage regulation after a 5 V buck converter powering FPGA I/O banks requiring precise 1.5 V. IC Role / Device Role / Timing Role: Low-ESR-stable linear regulator absorbing switching ripple and load transients. Use Value: Achieves <±1.5 mV load regulation (0–800 mA) and <±2.3 mV line regulation - critical for I/O voltage margining. |
| Consumer Equipment Point-of-Regulation | Active SCSI Termination |
Use Scenario: Local 1.5 V supply for ARM Cortex-M4 MCU cores in smart home hubs with variable ambient temperature. IC Role / Device Role / Timing Role: Temperature-stable voltage source with 0.5% thermal drift - maintains CPU clock stability. Use Value: Delivers consistent 1.5 V across −40°C to +125°C ambient (NCP1117I-grade variant available). | Use Scenario: Precision 2.85 V termination for legacy SCSI-2 differential bus interfaces. IC Role / Device Role / Timing Role: Fixed-output regulator replacing obsolete 2.85 V variants (e.g., NCP1117DT285RKG) in backward-compatible designs. Use Value: Matches SCSI-2 spec VTERM = 2.85 V ±3% with no external components - reduces BOM count and layout area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM1117DT-1.5/NOPB | Same 1.5 V fixed output, but 1.2 V dropout only at 100 mA; 1.3 V at 800 mA. Slightly higher quiescent current (5–10 mA). | Lower thermal margin in high-current, high-ambient scenarios due to reduced SOA compensation. | Select NCP1117DT15RK when operating continuously near 800 mA at >85°C ambient or requiring tighter initial accuracy. |
| TLV1117-15CDCYR | 1.5 V fixed, 1.2 V dropout at 800 mA, but rated only to 125°C junction and lacks automotive qualification. | Not AEC-Q100 qualified; unsuitable for automotive infotainment or ADAS modules requiring PPAP documentation. | Choose NCP1117DT15RK for industrial or automotive-adjacent applications needing extended temp range and traceable manufacturing controls. |
Compared with LM1117DT-1.5/NOPB and TLV1117-15CDCYR, the NCP1117DT15RK delivers superior thermal robustness at full load, guaranteed ±1.0% accuracy over temperature, and formal AEC-Q100 qualification - making it preferred for mission-critical embedded systems where long-term voltage stability and reliability are non-negotiable.
Availability
NCP1117DT15RK is available at Aetrix Electronics and suitable for hard drive controllers, switching power supply post-regulation, and consumer equipment point-of-regulation requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for NCP1117DT15RK 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 power management, analog, and sensor technologies.
The NCP1117 series was designed for high-reliability, low-dropout point-of-load regulation in industrial, computing, and automotive subsystems - emphasizing thermal resilience, precision output, and robust fault protection.
FAQ
What is the maximum input voltage rating for the NCP1117DT15RK?
The NCP1117DT15RK supports a maximum input voltage of 20 V, but its recommended operating input range for 1.5 V output is 2.9 V to 11.5 V. Exceeding 11.5 V increases power dissipation significantly and may trigger thermal shutdown under full load - verify thermal design using RJA = 67°C/W (DPAK, minimum pad) per datasheet Figure 22.
Does the NCP1117DT15RK require an external capacitor on the output pin?
Yes, the NCP1117DT15RK requires a minimum 4.7 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for stability. A 10 µF ceramic capacitor meets both requirements and is recommended for optimal transient response and noise suppression - aluminum electrolytic or tantalum types are acceptable if ESR remains within spec across temperature.
Is the NCP1117DT15RK pin-compatible with older regulators like the LM317?
No - the NCP1117DT15RK is a fixed-output device in DPAK-3 package with pinout Input-Ground-Output (Pin 3-1-2), whereas the LM317 is adjustable and uses Input-Output-Adjust (Pin 1-2-3). However, the NCP1117 series *is* pin-compatible with LM317-based PCB footprints *only* when using the SOT-223 variant (NCP1117ST15T3G), not the DPAK NCP1117DT15RK.
What thermal considerations apply to the NCP1117DT15RK in DPAK package?
The NCP1117DT15RK's DPAK package uses the exposed tab (connected to Pin 2) as a thermal path. With a minimum copper pad, RJA = 67°C/W; increasing copper area to 100 mm² reduces RJA to ~35°C/W. At 800 mA and 10 V input, power dissipation exceeds 6.8 W - adequate heatsinking or forced airflow is required to maintain TJ < 125°C.
Can the NCP1117DT15RK be used in automotive applications?
The standard NCP1117DT15RK is not AEC-Q100 qualified. For automotive use, select the NCV1117DT15RKG variant - identical pinout and electrical specs, but manufactured under automotive-specific process controls, qualified to AEC-Q100 Grade 1 (−40°C to +125°C), and PPAP-capable with full traceability.
NCP1117DT15RK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 800mA
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 72dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
NCP1117DT15RK FAQ
1.How can I place an order for NCP1117DT15RK through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117DT15RK 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 NCP1117DT15RK reliable?
The price and inventory of NCP1117DT15RK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117DT15RK is usually 5 days.
3.What payment methods are accepted for NCP1117DT15RK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117DT15RK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117DT15RK?
NCP1117DT15RK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117DT15RK 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 NCP1117DT15RK?
For technical support, including NCP1117DT15RK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117DT15RK requirements.
6.How does Aetrix verify that NCP1117DT15RK is sourced from the original manufacturer or authorized distributors?
All NCP1117DT15RK 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 NCP1117DT15RK meets industry standards.
7.What is the process for return or replacement of NCP1117DT15RK?
All NCP1117DT15RK units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117DT15RK, 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 NCP1117DT15RK part is unused and in its original packaging.
Return procedure for NCP1117DT15RK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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