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onsemi NCP1117DT19RKG
- Part No.:
- NCP1117DT19RKG
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
NCP1117DT19RKG.pdf
- Description:
- IC REG LINEAR 1.9V 1A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,436
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Product details
Overview
NCP1117DT19RKG from onsemi is a 1.9 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 and ±1.0% output voltage accuracy. It features thermal shutdown, current limiting, and safe operating area compensation, and is used for point-of-load regulation in hard drive controllers and battery chargers.
For engineers reviewing the NCP1117DT19RKG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at full load, thermal performance in DPAK layout, no-minimum-load operation, and compatibility with 20 V max input in industrial power rails.
Technical Context
The NCP1117DT19RKG uses a PNP pass transistor architecture enabling low dropout operation without requiring external bypass capacitors for stability. Its internal reference is trimmed to ±1.0% over temperature, and regulation is maintained from 3.3 V to 11.9 V input across 0–800 mA load range.
Protection circuitry includes foldback current limiting, thermal shutdown activation at ~175°C, and safe operating area compensation - all integrated without external components. The device operates across 0°C to +125°C ambient and supports infinite output short-circuit duration under thermal limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.900 V (±1.0% accuracy; no minimum load required) |
| Max Output Current | 1.0 A (derated above 12 V input; internally current-limited) |
| Dropout Voltage | 1.20 V at 800 mA (enables regulation with Vin as low as 3.1 V) |
| Input Voltage Range | 3.3 V to 20 V (supports wide-input post-regulation after switching converters) |
| Thermal Shutdown | ~175°C junction (self-resetting; prevents catastrophic failure) |
| Quiescent Current | 4.3 mA (low static consumption for always-on subsystems) |
| Ripple Rejection | 62 dB at 120 Hz (effective suppression of switching converter ripple) |
Pinout & Package
DPAK (Case 369C) package with exposed metal tab thermally connected to Pin 2 (Output). Mounting requires PCB copper pour for heatsinking; RJA = 67°C/W min pad, RJC = 6.0°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground / Adjust | Reference node for regulation; connects to system ground; no external resistor needed for fixed-output version |
| 2 | Output | Regulated 1.9 V supply; electrically and thermally tied to exposed heatsink tab |
| 3 | Input | Unregulated DC input (3.3–20 V); requires ≥10 µF input capacitor if > few inches from source |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.9 V output | Eliminates external resistors and tuning; reduces BOM count and layout complexity |
| No minimum load requirement | Enables stable regulation even at zero load - critical for standby and sleep-mode circuits |
| 1.2 V dropout at 800 mA | Permits use with low-headroom inputs (e.g., 3.3 V rail derived from 5 V bus) |
| Integrated thermal & current protection | Removes need for external fault-handling circuitry; simplifies safety certification |
| Pb-free DPAK package | Complies with RoHS; compatible with standard reflow profiles and industrial assembly lines |
Applications
| Hard Drive Controllers | Battery Chargers |
|---|---|
Use Scenario: Regulating 1.9 V core supply for SATA controller ICs during active read/write and low-power idle states. IC Role / Device Role / Timing Role: Primary LDO providing clean, stable 1.9 V bias to high-speed SerDes logic and PHY blocks. Use Value: Maintains regulation down to 3.1 V input, enabling direct use of buck-converted 5 V rails without additional pre-regulation stages. | Use Scenario: Generating precise 1.9 V bias for charge management ICs monitoring Li-ion cell voltage and temperature. IC Role / Device Role / Timing Role: Fixed-output LDO supplying reference and analog front-end circuitry in multi-cell charger modules. Use Value: ±1.0% output accuracy ensures consistent ADC reference scaling across temperature, improving state-of-charge estimation fidelity. |
| Consumer Point-of-Regulation | Industrial Equipment Power Rails |
Use Scenario: Local regulation for FPGA I/O banks or microcontroller peripherals requiring noise-immune 1.9 V supply. IC Role / Device Role / Timing Role: Low-noise, low-dropout post-regulator decoupling switching converter ripple. Use Value: 62 dB ripple rejection at 120 Hz suppresses low-frequency switching artifacts, reducing digital jitter and analog measurement error. | Use Scenario: Powering sensor interface ASICs in programmable logic controllers where ambient temperature swings from −20°C to +70°C occur. IC Role / Device Role / Timing Role: Industrial-grade LDO delivering stable 1.9 V to precision op-amps and ADC drivers. Use Value: Operates from 0°C to +125°C ambient with guaranteed dropout and line/load regulation - eliminates derating calculations. |
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 |
|---|---|---|---|
| TLV1117-19CDCYR | 1.9 V fixed, SOT-223, 800 mA max output, 1.2 V dropout at 800 mA, ±2% accuracy | Lower current rating and looser tolerance; lacks automotive qualification | Acceptable for cost-sensitive consumer designs where 800 mA and ±2% meet requirements |
| NCV1117DT19RKG | Same pinout, 1.9 V fixed, DPAK, AEC-Q100 qualified, −40°C to +125°C operation | Automotive-qualified variant with extended temp range and PPAP support | Required for automotive ECUs or industrial systems needing AEC-Q100 compliance and wider thermal margin |
Compared with TLV1117-19CDCYR, NCP1117DT19RKG delivers higher output current (1.0 A vs. 0.8 A) and tighter voltage accuracy (±1.0% vs. ±2%), while NCV1117DT19RKG adds automotive qualification and extended temperature capability - making it suitable for mission-critical embedded control.
Availability
NCP1117DT19RKG is available at Aetrix Electronics and suitable for hard drive controllers, battery chargers, and industrial equipment power rails requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for NCP1117DT19RKG 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, and consumer markets.
The NCP1117 series was designed for high-reliability, low-dropout point-of-load regulation in space-constrained applications - emphasizing thermal robustness, precision output, and seamless integration into existing LM317-based layouts.
FAQ
What is the maximum input voltage for NCP1117DT19RKG?
The NCP1117DT19RKG supports a maximum input voltage of 20 V. Operation beyond this rating risks permanent damage. Input must remain within 3.3 V to 20 V to maintain regulation and thermal safety - especially critical when delivering 1.0 A output current.
Does NCP1117DT19RKG require an output capacitor?
Yes, NCP1117DT19RKG requires a minimum 4.7 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for stability. Ceramic, tantalum, or aluminum electrolytic types are acceptable if they meet these specifications across the full operating temperature range.
Is NCP1117DT19RKG pin-compatible with older regulators?
Yes, NCP1117DT19RKG is pin-compatible with the industry-standard LM317 in DPAK footprint, enabling drop-in replacement in legacy designs - provided input voltage, thermal layout, and output capacitor requirements are verified per the NCP1117DT19RKG datasheet.
What is the thermal resistance of NCP1117DT19RKG in DPAK package?
The NCP1117DT19RKG in DPAK (Case 369C) has a typical junction-to-ambient thermal resistance (RJA) of 67°C/W with minimum PCB copper pad, and junction-to-case (RJC) of 6.0°C/W. Effective heatsinking via large copper pours is essential to sustain 1.0 A continuous output.
Can NCP1117DT19RKG operate without a minimum load?
Yes, NCP1117DT19RKG is a fixed-output variant that maintains regulation with zero load current - unlike adjustable versions which require ≥0.8 mA minimum load. This enables reliable operation in ultra-low-power sleep modes and intermittent-sensing applications.
NCP1117DT19RKG 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):
- 1.9V
- 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
NCP1117DT19RKG FAQ
1.How can I place an order for NCP1117DT19RKG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117DT19RKG 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 NCP1117DT19RKG reliable?
The price and inventory of NCP1117DT19RKG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117DT19RKG is usually 5 days.
3.What payment methods are accepted for NCP1117DT19RKG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117DT19RKG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117DT19RKG?
NCP1117DT19RKG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117DT19RKG 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 NCP1117DT19RKG?
For technical support, including NCP1117DT19RKG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117DT19RKG requirements.
6.How does Aetrix verify that NCP1117DT19RKG is sourced from the original manufacturer or authorized distributors?
All NCP1117DT19RKG 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 NCP1117DT19RKG meets industry standards.
7.What is the process for return or replacement of NCP1117DT19RKG?
All NCP1117DT19RKG units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117DT19RKG, 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 NCP1117DT19RKG part is unused and in its original packaging.
Return procedure for NCP1117DT19RKG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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