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onsemi NCP1117DT15G
- Part No.:
- NCP1117DT15G
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
NCP1117DT15G.pdf
- Description:
- IC REG LINEAR 1.5V 1A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,060
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Product details
Overview
NCP1117DT15G from onsemi is a 1.5 V fixed-output, low-dropout linear voltage regulator in DPAK package, delivering up to 1.0 A output current with 1.2 V max dropout at 800 mA, ±1.0% output voltage accuracy, and integrated thermal shutdown, current limiting, and safe operating area protection. It operates from 2.9 V to 11.5 V input and is used for point-of-load regulation in hard drive controllers and battery chargers.
For engineers reviewing the NCP1117DT15G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at full load, thermal performance in DPAK layout, line/load regulation specs (≤0.5% and ≤4.3 mV), and compatibility with 10 µF ceramic output capacitance without minimum load requirement.
Technical Context
The NCP1117DT15G employs a PNP pass transistor architecture enabling low dropout operation down to 1.07 V at 800 mA over temperature. Its internal bandgap reference is trimmed to ±1.0% accuracy, and regulation stability is maintained across 0°C to +125°C ambient via on-chip thermal compensation.
Protection circuitry includes foldback current limiting that activates before junction temperature reaches 175°C, and safe operating area (SOA) compensation prevents secondary breakdown during transient overload. The device requires no external components for basic operation and supports stable regulation with 10 µF output capacitance and ESR between 33 mΩ and 2.2 Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.5 V ±1.0% - ensures precise rail generation for 1.5 V logic or analog subsystems without post-regulation trimming. |
| Max Dropout Voltage | 1.2 V at 800 mA - enables operation with only 2.7 V input, critical for single-cell Li-ion or low-voltage DC-DC post-regulation. |
| Output Current | 1.0 A continuous - sufficient for powering microcontrollers, sensors, or interface ICs in embedded systems. |
| Input Voltage Range | 2.9 V to 11.5 V - compatible with unregulated 3.3 V/5 V/9 V supply rails and switching converter outputs. |
| Line Regulation | 0.5 mV - minimal output shift over full input range, preserving signal integrity in precision analog circuits. |
| Load Regulation | 4.3 mV - tight output stability from no-load to full 1.0 A, eliminating need for dynamic load compensation. |
| Ripple Rejection | 66 dB at 120 Hz - suppresses switching noise from upstream converters, reducing need for additional filtering. |
| Quiescent Current | 3.6 mA - low standby power draw, suitable for always-on industrial monitoring nodes. |
Pinout & Package
DPAK (Case 369C) surface-mount package with exposed metal tab thermally connected to Pin 2 (Output); requires PCB copper pour for thermal management per Figure 22.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground / Adjust | Reference node for internal error amplifier; must be connected directly to system ground plane to avoid regulation error. |
| 2 | Output | Main regulated 1.5 V supply; heatsink tab is electrically tied to this pin - isolation from chassis ground required if chassis is not at system GND. |
| 3 | Input | Unregulated input supply; requires local 10 µF bypass capacitor placed within 5 mm of pin to ensure transient response and stability. |
Key Features
| Feature | Design Value |
|---|---|
| No minimum load requirement | Enables stable 1.5 V regulation even at zero load - eliminates dummy load resistors in low-power sleep modes. |
| Thermal shutdown with hysteresis | Shuts down at ~175°C junction and restarts at ~150°C - prevents thermal runaway while allowing recovery without manual reset. |
| Pb-free DPAK package | RoHS-compliant lead finish and halogen-free molding compound meet IPC-J-STD-020 moisture sensitivity level 3 (MSL3). |
| Pin-compatible with LM317 | Direct replacement in legacy designs using LM317-based 1.5 V circuits - no PCB rework needed for upgrade path. |
| Stable with ceramic output capacitors | Validated for 10 µF X7R/X5R MLCCs - reduces board area vs. tantalum and avoids aging-related capacitance drift. |
Applications
| Hard Drive Controllers | Battery Chargers |
|---|---|
Use Scenario: Regulating 1.5 V supply for SATA PHY and controller logic in 2.5″ SSDs and HDDs. IC Role / Device Role / Timing Role: Primary LDO providing clean, low-noise 1.5 V rail with fast load transient response to handle burst data transfers. Use Value: Maintains <±10 mV output deviation during 0–1 A load steps (Fig. 18), preventing PHY lock loss or CRC errors. | Use Scenario: Generating 1.5 V bias for charging IC control logic and ADC reference in multi-cell Li-ion chargers. IC Role / Device Role / Timing Role: Fixed-output LDO supplying isolated logic rail decoupled from high-current charge path. Use Value: ±1.0% accuracy ensures consistent ADC reference scaling across temperature, improving charge termination precision. |
| Industrial Point-of-Regulation | Active SCSI Termination |
Use Scenario: Local regulation for FPGA I/O banks or sensor signal conditioning in programmable logic controllers. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO placed adjacent to noise-sensitive analog sections. Use Value: 66 dB ripple rejection at 120 Hz suppresses switching noise from shared 5 V DC-DC, reducing SNR degradation by >12 dB. | Use Scenario: Providing precise 2.85 V termination voltage for legacy SCSI-2/3 bus interfaces (NCP1117XT285 variant). IC Role / Device Role / Timing Role: Fixed-output regulator sourcing termination current into parallel 110 Ω resistors (Fig. 3). Use Value: No minimum load requirement allows stable 2.85 V output even when bus is idle - eliminates need for pull-up resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LD1117S15TR | 1.5 V fixed, 1 A, SOT-223 package, 1.3 V dropout at 800 mA, ±2% output tolerance | Higher dropout and looser tolerance; requires larger input margin and less precision-critical loads | Select when cost is primary constraint and thermal budget permits SOT-223 mounting without extended copper pour. |
| TLV1117-15CDCYR | 1.5 V fixed, 800 mA, SOT-223, 1.2 V dropout at 800 mA, ±1% tolerance, 60 µA quiescent current | Lower max current and higher PSRR (70 dB), but no thermal shutdown hysteresis | Select for ultra-low-power applications where 800 mA suffices and tighter quiescent current matters more than fault recovery behavior. |
Compared with LD1117S15TR and TLV1117-15CDCYR, the NCP1117DT15G offers superior thermal robustness (hysteretic shutdown), tighter output accuracy, and DPAK's higher power dissipation capability - making it optimal for industrial environments with sustained 1 A loads and ambient temperatures up to +125°C.
Availability
NCP1117DT15G is available at Aetrix Electronics and suitable for hard drive controllers, battery chargers, and industrial point-of-regulation applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for NCP1117DT15G 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, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The NCP1117 series was designed specifically for high-reliability, low-dropout point-of-load regulation in space-constrained industrial and computing applications - emphasizing thermal resilience, ±1% accuracy, and seamless drop-in replacement for legacy LM317 designs.
FAQ
What is the maximum input voltage rating for the NCP1117DT15G?
The NCP1117DT15G has a maximum input voltage rating of 20 V, but its recommended operating input range for 1.5 V output is 2.9 V to 11.5 V per the Electrical Characteristics table. Exceeding 11.5 V increases power dissipation and thermal stress without functional benefit, and operation above 20 V risks permanent damage per Absolute Maximum Ratings.
Does the NCP1117DT15G require an external capacitor on the adjust pin?
No, the NCP1117DT15G is a fixed-output variant and does not use the adjust pin as a functional terminal - Pin 1 serves solely as ground. Therefore, no external capacitor is required on Pin 1. This differs from the adjustable NCP1117DTAG version, which mandates Cadj for ripple rejection enhancement.
Can the NCP1117DT15G be used without a heatsink in a 1 A application?
The NCP1117DT15G can operate at 1 A without an external heatsink only if PCB copper area meets thermal requirements: ≥67 °C/W RJA (per DPAK spec) demands ≥25 mm² of 2 oz. copper connected to the tab. At 25°C ambient and 1 A load with 5 V input, junction temperature reaches ~110°C - acceptable within the −40°C to +125°C rating, but derating is advised above 85°C ambient.
Is the NCP1117DT15G pin-compatible with the LM317 in a 1.5 V configuration?
Yes, the NCP1117DT15G is pin-compatible with the LM317 when used in fixed 1.5 V applications - Pin 1 (Ground) aligns with LM317 ADJ, Pin 2 (Output) with LM317 OUT, and Pin 3 (Input) with LM317 IN. However, unlike the LM317, the NCP1117DT15G requires no external resistors and delivers tighter accuracy and lower dropout.
What output capacitor value and type are validated for stable operation of the NCP1117DT15G?
The NCP1117DT15G is validated for stable operation with a 10 µF ceramic (X7R/X5R) output capacitor having ESR between 33 mΩ and 2.2 Ω. Tantalum and aluminum electrolytic types are also supported if they meet these ESR limits across −40°C to +125°C. Lower ESR values (<33 mΩ) may cause instability unless compensated per Figure 12 guidelines.
NCP1117DT15G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Bulk
- 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
NCP1117DT15G FAQ
1.How can I place an order for NCP1117DT15G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117DT15G 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 NCP1117DT15G reliable?
The price and inventory of NCP1117DT15G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117DT15G is usually 5 days.
3.What payment methods are accepted for NCP1117DT15G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117DT15G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117DT15G?
NCP1117DT15G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117DT15G 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 NCP1117DT15G?
For technical support, including NCP1117DT15G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117DT15G requirements.
6.How does Aetrix verify that NCP1117DT15G is sourced from the original manufacturer or authorized distributors?
All NCP1117DT15G 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 NCP1117DT15G meets industry standards.
7.What is the process for return or replacement of NCP1117DT15G?
All NCP1117DT15G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117DT15G, 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 NCP1117DT15G part is unused and in its original packaging.
Return procedure for NCP1117DT15G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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