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onsemi NCP1117DT33G
- Part No.:
- NCP1117DT33G
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
NCP1117DT33G.pdf
- Description:
- IC REG LINEAR 3.3V 1A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,755
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Product details
Overview
NCP1117DT33G from onsemi is a 3.3 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 over temperature, ±1.0% output voltage accuracy, and integrated thermal shutdown, current limiting, and safe operating area protection - used for point-of-load regulation in hard drive controllers and switching power supply post-regulation.
For engineers reviewing the NCP1117DT33G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at full load, thermal performance in DPAK with PCB copper heatsinking, ripple rejection at 120 Hz, no minimum load requirement, and compatibility with 10 µF ceramic input/output capacitors.
Technical Context
The NCP1117DT33G implements a monolithic PNP pass transistor architecture with internal bandgap reference trimmed to ±1.0%, enabling stable 3.3 V output across 0°C to +125°C ambient. It operates with input voltages up to 20 V and requires no minimum load for regulation.
Its protection circuitry includes foldback current limiting, thermal shutdown activation at ~175°C junction temperature, and safe operating area compensation - all implemented without external components. The device maintains 62 dB ripple rejection at 120 Hz with Vin–Vout = 6.4 V and Iout = 500 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±1.0% (1.5 V to 12 V fixed variants exist; this part is factory-trimmed 3.3 V) |
| Max Output Current | 1.0 A continuous (limited to 1.0 A when Vin > 12 V per datasheet Note 6) |
| Dropout Voltage | 1.2 V max at 800 mA over temperature (enables operation with Vin as low as 4.5 V) |
| Input Voltage Range | Up to 20 V DC (supports wide-input post-regulation after buck converters) |
| Ripple Rejection | 62 dB at 120 Hz (Vin–Vout = 6.4 V, Iout = 500 mA; critical for noisy switcher outputs) |
| Quiescent Current | 6.0 mA typical at Vin = 15 V (low static consumption for always-on subsystems) |
| Thermal Shutdown | Activates at ~175°C junction temperature (prevents catastrophic failure during overload) |
Pinout & Package
DPAK (TO-252) package, Case 369C, with exposed metal tab thermally and electrically connected to Pin 2 (Output). Standard 3-pin configuration optimized for PCB copper heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Adjust / Ground | Reference node for internal error amplifier; tied directly to system ground for fixed-output operation |
| 2 | Output | Main regulated 3.3 V power rail; tab connection enables direct PCB copper thermal path |
| 3 | Input | Unregulated input supply (up to 20 V); requires local 10 µF ceramic bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| No minimum load requirement | Enables stable 3.3 V regulation even at zero load - eliminates need for bleeder resistors |
| 1.2 V max dropout at 800 mA | Permits use with low-headroom inputs (e.g., 5 V bus → 3.3 V rail), reducing power loss vs. legacy regulators |
| ±1.0% output voltage accuracy | Guarantees 3.267–3.333 V output across temp and line/load, meeting tight microcontroller core rail specs |
| Integrated thermal shutdown | Self-protects during sustained overload or inadequate heatsinking - no external sensor or logic needed |
| 62 dB ripple rejection at 120 Hz | Effectively suppresses rectified AC ripple in battery charger or offline SMPS post-regulation stages |
Applications
| Hard Drive Controllers | Switching Power Supply Post Regulation |
|---|---|
Use Scenario: Providing clean, stable 3.3 V supply to SATA controller ICs and buffer memory in enterprise storage systems. IC Role / Device Role / Timing Role: Primary LDO regulator delivering low-noise, high-current 3.3 V rail with fast transient response to burst data transfers. Use Value: Eliminates need for external current-limiting or thermal monitoring circuitry while maintaining <±1.5 mV output deviation under 0–1 A load steps. | Use Scenario: Final-stage regulation after a 5 V or 12 V buck converter powering FPGA I/O banks or industrial PLC logic rails. IC Role / Device Role / Timing Role: Low-dropout post-regulator suppressing switching noise and compensating for converter output tolerance drift. Use Value: Delivers 62 dB ripple rejection at 120 Hz and maintains regulation down to Vin = 4.5 V, enabling robust operation despite upstream converter ripple and droop. |
| Consumer Equipment Point-of-Regulation | Battery Chargers |
Use Scenario: Local 3.3 V supply for USB-C PD controller, display interface, or audio codec in portable media players. IC Role / Device Role / Timing Role: Compact, thermally efficient LDO placed near load to minimize IR drop and EMI. Use Value: DPAK package allows >1 W dissipation with minimal PCB copper area; ±1.0% accuracy ensures reliable USB enumeration and audio DAC reference stability. | Use Scenario: Regulating 3.3 V auxiliary rail in multi-chemistry Li-ion/LiPo chargers for system management MCU and fuel gauges. IC Role / Device Role / Timing Role: Stable bias supply tolerant of wide input variation (9–20 V adapter range) and intermittent load transients. Use Value: Operates continuously up to 20 V input and sustains 1.0 A output without derating - supports simultaneous charging and system operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC29302WU-3.3 | 3.0 A output, 0.4 V dropout at 3 A, TO-263 package; higher quiescent current (30 mA) | Higher current capability suits motor driver logic rails; less suitable for space-constrained 1 A designs | Select when >1 A load or sub-0.5 V dropout is required; verify thermal design for TO-263 footprint |
| TLV1117-33CDR | 800 mA max output, SOT-223 only, 1.2 V dropout at 800 mA, ±2% accuracy | Limited current and lower accuracy restrict use to non-critical logic rails or low-power IoT nodes | Choose for cost-sensitive, low-power applications where 3.3 V ±2% and 800 mA suffice |
Compared with MIC29302WU-3.3 and TLV1117-33CDR, the NCP1117DT33G offers optimal balance of 1.0 A capability, ±1.0% accuracy, DPAK thermal performance, and no-minimum-load operation - making it ideal for industrial and storage applications demanding reliability and precision.
Availability
NCP1117DT33G 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, long-term lifecycle support, and Pb-free compliance.
Supply support for NCP1117DT33G 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 innovation for automotive, industrial, cloud, medical, and IoT applications.
The NCP1117 series belongs to onsemi's precision analog power management portfolio, designed specifically for high-reliability, low-dropout linear regulation in noise-sensitive and thermally constrained systems.
FAQ
What is the maximum input voltage rating for the NCP1117DT33G?
The NCP1117DT33G supports a maximum input voltage of 20 V DC, as specified in the Absolute Maximum Ratings table. Operation beyond this voltage risks permanent damage. For reliable long-term use, design with headroom - e.g., limit Vin to ≤18 V in environments with line transients or poor filtering.
Does the NCP1117DT33G require an output capacitor, and what type is recommended?
Yes, the NCP1117DT33G requires a minimum 4.7 µF output capacitor with ESR between 33 mΩ (typ) 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. A 10 µF X7R ceramic capacitor is commonly used and validated in typical applications.
Is a minimum load current required for the NCP1117DT33G to maintain regulation?
No, the NCP1117DT33G does not require a minimum load current to maintain regulation - a key advantage over older LDOs. This eliminates the need for bleeder resistors and reduces standby power consumption, especially beneficial in always-on or low-power sleep-mode applications.
How is thermal performance affected by PCB layout for the NCP1117DT33G in DPAK package?
Thermal performance of the NCP1117DT33G depends critically on PCB copper area connected to the exposed tab (Pin 2). With a 2 oz. copper square pad, RJA drops to ~67°C/W (min size pad) - enabling ~1.2 W dissipation at TA = 50°C. Extending copper traces significantly lowers RJA; Figure 22 in the datasheet provides empirical curves for optimization.
Can the NCP1117DT33G be used as a direct replacement for the LM317 in adjustable configurations?
No - the NCP1117DT33G is a fixed 3.3 V output variant and cannot replace the adjustable LM317. However, the adjustable NCP1117DTAG *is* pin-compatible with the LM317 and shares similar external resistor programming. For fixed-output upgrades, verify that 3.3 V matches system requirements before substitution.
NCP1117DT33G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 800mA
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 64dB (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
NCP1117DT33G FAQ
1.How can I place an order for NCP1117DT33G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117DT33G 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 NCP1117DT33G reliable?
The price and inventory of NCP1117DT33G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117DT33G is usually 5 days.
3.What payment methods are accepted for NCP1117DT33G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117DT33G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117DT33G?
NCP1117DT33G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117DT33G 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 NCP1117DT33G?
For technical support, including NCP1117DT33G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117DT33G requirements.
6.How does Aetrix verify that NCP1117DT33G is sourced from the original manufacturer or authorized distributors?
All NCP1117DT33G 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 NCP1117DT33G meets industry standards.
7.What is the process for return or replacement of NCP1117DT33G?
All NCP1117DT33G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117DT33G, 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 NCP1117DT33G part is unused and in its original packaging.
Return procedure for NCP1117DT33G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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