NCP1117ST18T3G ON Semiconductor Power Supply (SOT223 (3-Pin)) In Stock
ON Semiconductor NCP1117ST18T3G is a 1.8 V fixed-output low-dropout linear voltage regulator in SOT-223 4-pin package, with up to 1 A output current, 1.07 V typical dropout voltage, and input voltage up to 11.8 V. Available in stock worldwide.
- Manufacturer
- ON Semiconductor
- Package
- SOT223 (3-Pin)
- Pin Count
- 4
- Lifecycle
- ACTIVE
- Datasheet
- NCP1117ST18T3G Datasheet PDF
- Category
- Power Supply
- Price
- From $0.1463(MOQ 1)
- Temp Range
- ?°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Fixed 1.8 V output with 1.07 V typical dropout voltage supports low-headroom regulation from input rails as low as 3.2 V
- SOT-223 4-pin package provides excellent thermal dissipation for continuous output currents up to 1 A in compact PCB layouts
- Wide input voltage range up to 11.8 V with 20 V absolute maximum enables use across diverse power supply architectures
Applications
The NCP1117ST18T3G is widely used in embedded systems, microcontroller boards, and IoT devices that require a stable 1.8 V supply rail derived from 3.3 V, 5 V, or higher input rails. Its low 1.07 V dropout voltage and 1 A current capability make it suitable for powering 1.8 V logic cores, DDR memory interfaces, and RF modules in consumer electronics, industrial instrumentation, and communication equipment.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | 318H-01 |
| YTEOL | 6.2 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 1.2V |
| Dropout Voltage1-Nom | 1.07V |
| Input Voltage Absolute-Max | 20V |
| Input Voltage-Max | 11.8V |
| Input Voltage-Min | 3.2V |
| JESD-30 Code | R-PDSO-G4 |
| JESD-609 Code | e3 |
| Line Regulation-Max | 0.001% |
| Load Regulation-Max | 0.006% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 150°C |
| Operating Temperature TJ-Min | -55 °C |
| Output Current1-Max | 1A |
| Output Voltage1-Max | 1.845V |
| Output Voltage1-Min | 1.755V |
| Output Voltage1-Nom | 1.8V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOT-223 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Regulator Type | FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR |
| Screening Level | AEC-Q100 |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | GULL WING |
| Terminal Pitch | 2.3mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Voltage Tolerance-Max | 2.5% |
| Package | SOT223 (3-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the output voltage and maximum output current of the NCP1117ST18T3G?
The NCP1117ST18T3G is a fixed 1.8 V LDO regulator capable of supplying up to 1 A of continuous output current. With a typical dropout voltage of only 1.07 V, it can regulate 1.8 V from an input as low as approximately 3.2 V, making it ideal for powering 1.8 V logic and memory interfaces in tight power budget designs.
Why is the SOT-223 package well-suited for the NCP1117ST18T3G in thermally demanding applications?
The SOT-223 4-pin package features a large exposed pad that significantly improves heat dissipation compared to smaller SOT-89 or SOT-23 packages. At 1 A output and a dropout of 1.07 V, power dissipation can reach approximately 1 W or more, and the SOT-223 thermal resistance allows adequate heat spreading when paired with a proper PCB copper pour, keeping junction temperature within safe limits.
Can the NCP1117ST18T3G be used to power DDR memory interfaces from a 3.3 V rail?
Yes, the NCP1117ST18T3G is a strong fit for powering DDR memory VDDQ rails at 1.8 V from a 3.3 V supply. The 1.5 V headroom between a 3.3 V input and 1.8 V output comfortably exceeds the 1.07 V typical dropout voltage, and the 1 A current rating accommodates the average DDR1 or LPDDR load current requirements in embedded computing and mobile systems.
How does the NCP1117ST18T3G compare to the adjustable NCP1117 variant for fixed-voltage power designs?
The NCP1117ST18T3G provides a factory-trimmed fixed 1.8 V output, eliminating the need for external resistor dividers required by the adjustable NCP1117. This reduces BOM count, avoids resistor tolerance errors, and simplifies PCB layout, making it the preferred choice when exactly 1.8 V at up to 1 A from inputs up to 11.8 V is the target supply rail.
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About ON Semiconductor
ON Semiconductor (onsemi) provides intelligent power and sensing technologies for automotive, industrial, IoT, and cloud infrastructure applications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.2710 | $0.27 |
| 25+ | $0.2250 | $5.63 |
| 100+ | $0.2081 | $20.81 |
| 250+ | $0.1800 | $45.00 |
| 500+ | $0.1575 | $78.75 |
| 1000+ | $0.1463 | $146.30 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
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