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onsemi NCP1117ST20T3G
- Part No.:
- NCP1117ST20T3G
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCP1117ST20T3G.pdf
- Description:
- IC REG LINEAR 2V 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:2,288
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Product details
Overview
NCP1117ST20T3G from onsemi is a 2.0 V fixed-output, 1.0 A low-dropout linear voltage regulator in SOT-223 package. It delivers stable output with ≤1.2 V dropout at 800 mA, ±1.0% output voltage accuracy, and operates up to 20 V input. Used for point-of-load regulation in industrial controllers and hard drive power rails.
For engineers reviewing the NCP1117ST20T3G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at full load, thermal performance with PCB copper heatsinking, line/load regulation specs, and compatibility with 10 µF ceramic output capacitors.
Technical Context
The NCP1117ST20T3G implements a bandgap-referenced series pass architecture with internal current limiting, safe operating area compensation, and thermal shutdown at ~175°C. Its reference voltage is trimmed to ±1.0%, enabling tight output tolerance without external components.
It requires no minimum load for regulation and supports stable operation with 4.7 µF–10 µF output capacitance (ESR 33 mΩ–2.2 Ω). Input bypass capacitor (10 µF) is recommended when placed > few inches from source to improve transient response and reduce sensitivity to source impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.0 V ±1.0% (1.98–2.02 V at 25°C, 1.96–2.04 V over full temp/load range) |
| Max Output Current | 1.0 A continuous (derated above 12 V input per datasheet Note 6) |
| Dropout Voltage | 1.20 V max at 800 mA and full temperature range (enables 3.4 V min input for 2.0 V output) |
| Line Regulation | 0.5 mV typical (0.5% max change over 3.4–12 V input at zero load) |
| Load Regulation | 3.0 mV typical (3.0% max change from 0–800 mA load at fixed input) |
| Ripple Rejection | 60 dB at 120 Hz (Vin−Vout = 3.0 V, Iout = 500 mA), critical for post-regulation of switching supplies) |
| Quiescent Current | 4.5 mA typical (low bias draw supports battery-backed or always-on systems) |
| Thermal Shutdown | Activates at ~175°C junction temperature (protects against sustained overload or insufficient heatsinking) |
Pinout & Package
SOT-223 package (Case 318H), surface-mount, with exposed metal tab thermally connected to Pin 2 (Output). Requires minimum-size PCB copper pad for thermal management per Figure 21.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground / Adjust | Reference node for internal error amplifier; tied directly to system ground for fixed-output operation |
| 2 | Output | Main regulated 2.0 V supply rail; connected to heatsink tab for thermal conduction |
| 3 | Input | Unregulated DC input (up to 20 V); requires local 10 µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| No minimum load requirement | Enables stable 2.0 V regulation even at 0 mA load - ideal for standby or low-power sleep modes |
| Internal thermal shutdown | Prevents catastrophic failure during sustained overload or inadequate PCB heatsinking |
| ±1.0% output voltage accuracy | Reduces need for post-production calibration and improves system-level voltage margining |
| 1.2 V max dropout at 800 mA | Supports higher efficiency than legacy regulators (e.g., LM317) in low-VIN applications |
| Pb-free SOT-223 package | Complies with RoHS and JEDEC moisture sensitivity level (MSL) requirements for reflow assembly |
Applications
| Industrial Motor Control Logic Power | Hard Disk Drive +2.0 V Bias Rail |
|---|---|
Use Scenario: Powers FPGA configuration logic and microcontroller I/O banks in servo drives requiring clean, stable 2.0 V. IC Role / Device Role / Timing Role: Primary low-noise LDO delivering regulated 2.0 V from intermediate 3.3–5.0 V rail. Use Value: 60 dB ripple rejection suppresses switching noise from upstream DC/DC converters, preventing logic errors. | Use Scenario: Supplies 2.0 V to HDD preamplifier ICs and servo control circuitry where tight voltage tolerance is mandatory. IC Role / Device Role / Timing Role: Fixed-output LDO providing precision bias voltage independent of load transients. Use Value: ±1.0% output accuracy ensures consistent head positioning and signal integrity across temperature. |
| Consumer Set-Top Box SoC Core Supply | Automotive Infotainment USB Hub Controller |
Use Scenario: Regulates 2.0 V for ARM Cortex-A series SoC core logic in media streaming devices. IC Role / Device Role / Timing Role: Point-of-load regulator placed adjacent to SoC BGA package for minimal IR drop. Use Value: 1.2 V dropout enables use of lower-input intermediate rails, improving overall system efficiency. | Use Scenario: Provides 2.0 V to USB 2.0 hub controller ICs in automotive infotainment head units. IC Role / Device Role / Timing Role: Secondary LDO fed from 3.3 V domain, meeting AEC-Q100 stress requirements via NCV1117 variant family. Use Value: Thermal shutdown and -40°C to +125°C operation ensure reliability under under-hood temperature cycling. |
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 |
|---|---|---|---|
| TLV1117-20CDCYR | 2.0 V fixed, 800 mA max output, 1.2 V dropout at 800 mA, SO-8 package (larger footprint, lower thermal performance) | SO-8 mounting limits PCB space efficiency and thermal dissipation vs. SOT-223 | Select when board layout requires through-hole-compatible footprint or dual-rail support (TLV1117 offers adjustable variant) |
| LD1086DT20R | 2.0 V fixed, 1.5 A max output, 1.5 V dropout at 1.5 A, TO-252 (DPAK) package, higher quiescent current (10 mA) | DPAK thermal resistance (RJA = 67°C/W) exceeds SOT-223 (160°C/W) only with large copper pour | Select when >1.0 A peak current is required and DPAK layout is already standardized |
Compared with TLV1117-20CDCYR and LD1086DT20R, the NCP1117ST20T3G offers superior thermal performance per mm² in SOT-223, tighter ±1.0% initial accuracy, and lower quiescent current - making it optimal for space-constrained, high-reliability 2.0 V point-of-load designs.
Availability
NCP1117ST20T3G is available at Aetrix Electronics and suitable for industrial motor control, hard disk drive power management, and consumer SoC core supply applications requiring stable component supply, RoHS compliance, and long-term lifecycle continuity.
Supply support for NCP1117ST20T3G 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 power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The NCP1117 series was designed as a pin-compatible, performance-enhanced replacement for legacy three-terminal regulators like LM317 - targeting cost-sensitive, high-volume applications needing reliable fixed-voltage LDOs with improved accuracy and thermal robustness.
FAQ
What is the maximum input voltage rating for the NCP1117ST20T3G?
The NCP1117ST20T3G supports a maximum input voltage of 20 V, as specified in the Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable 2.0 V output, the minimum input must be ≥3.4 V (accounting for 1.2 V dropout at full load), and input should remain within 3.4–20 V across all operating conditions including transients.
Does the NCP1117ST20T3G require an external capacitor on the output pin?
Yes, the NCP1117ST20T3G requires a minimum 4.7 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for stability, per datasheet Section 9. A 10 µF ceramic capacitor is recommended for optimal transient response and noise suppression. Omitting or undersizing Cout risks oscillation and output instability.
Is the NCP1117ST20T3G pin-compatible with the LM317?
No - the NCP1117ST20T3G is not pin-compatible with the LM317. While the NCP1117 series is described as pin-compatible with LM317 *in adjustable configurations*, the NCP1117ST20T3G is a fixed 2.0 V variant in SOT-223 (Pin 1 = GND, Pin 2 = VOUT, Pin 3 = VIN), whereas LM317 uses ADJ/VOUT/IN pinout in TO-220. Direct substitution requires PCB redesign.
What thermal derating applies to the NCP1117ST20T3G in SOT-223 package?
In SOT-223 (Case 318H), the NCP1117ST20T3G has RJA = 160°C/W with minimum pad, limiting power dissipation to ~0.625 W at 50°C ambient (PD = (150°C − 50°C)/160°C/W). Derating is required above 50°C ambient; Figure 21 shows how extending copper length reduces RJA - e.g., 40 mm copper trace lowers RJA to ~60°C/W, enabling ~1.67 W dissipation.
Can the NCP1117ST20T3G be used in automotive applications?
The NCP1117ST20T3G is rated for 0°C to +125°C ambient operation and is Pb-free, but it is not AEC-Q100 qualified. For automotive applications, use the NCV1117ST20T3G* variant (marked with * in datasheet Table 3), which is AEC-Q100 qualified, PPAP-capable, and manufactured under automotive-specific process controls.
NCP1117ST20T3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- 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):
- 2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 800mA
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223
NCP1117ST20T3G FAQ
1.How can I place an order for NCP1117ST20T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117ST20T3G 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 NCP1117ST20T3G reliable?
The price and inventory of NCP1117ST20T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117ST20T3G is usually 5 days.
3.What payment methods are accepted for NCP1117ST20T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117ST20T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117ST20T3G?
NCP1117ST20T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117ST20T3G 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 NCP1117ST20T3G?
For technical support, including NCP1117ST20T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117ST20T3G requirements.
6.How does Aetrix verify that NCP1117ST20T3G is sourced from the original manufacturer or authorized distributors?
All NCP1117ST20T3G 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 NCP1117ST20T3G meets industry standards.
7.What is the process for return or replacement of NCP1117ST20T3G?
All NCP1117ST20T3G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117ST20T3G, 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 NCP1117ST20T3G part is unused and in its original packaging.
Return procedure for NCP1117ST20T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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