LT1117IST-3.3#PBF Analog Devices Integrated Circuit (SOT223 (3-Pin)) In Stock
Analog Devices LT1117IST-3.3#PBF is a fixed 3.3 V low-dropout linear regulator with 1.1 V typical dropout voltage, accepting inputs from 4.75 V to 10 V and delivering up to 800 mA in SOT-223 package. It offers stable regulation for sensitive digital and analog loads. Available worldwide from authorized distributors.
- Manufacturer
- Analog Devices
- Package
- SOT223 (3-Pin)
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- LT1117IST-3.3#PBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $3.1600(MOQ 1)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LT1117IST-3.3#PBF?
- Fixed 3.3 V output with 1.1 V typical dropout enables operation from 4.75 V supplies common in USB and single-cell Li-ion systems
- Up to 800 mA output current in an SOT-223 4-pin package with exposed metal tab for thermal relief
- 1.3 V maximum dropout voltage ensures regulation headroom is maintained across production spread
- Input range up to 10 V (15 V absolute max) allows use with a wide variety of unregulated DC adapter inputs
What is LT1117IST-3.3#PBF used for?
The LT1117IST-3.3#PBF is widely used to supply 3.3 V logic rails in embedded systems, microcontroller boards, and FPGA designs powered from 5 V or higher unregulated inputs. Its SOT-223 package with thermal pad allows moderate load currents up to 800 mA without a heatsink in most PCB configurations. It is also a popular choice for powering RF transceivers, sensors, and memory modules requiring a clean, stable 3.3 V reference.
What are the specifications of LT1117IST-3.3#PBF?
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1630 |
| YTEOL | 10 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 1.3V |
| Dropout Voltage1-Nom | 1.1V |
| Input Voltage Absolute-Max | 15V |
| Input Voltage-Max | 10V |
| Input Voltage-Min | 4.75V |
| JESD-30 Code | R-PDSO-G4 |
| JESD-609 Code | e3 |
| Line Regulation-Max | 0.006% |
| Load Regulation-Max | 0.01% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 125°C |
| Operating Temperature TJ-Min | -40 °C |
| Output Current1-Max | 0.8A |
| Output Voltage1-Max | 3.365V |
| Output Voltage1-Min | 3.235V |
| Output Voltage1-Nom | 3.3V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SMSIP3H,.55TB |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Regulator Type | FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 2.3mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Voltage Tolerance-Max | 2% |
| Package | SOT223 (3-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Malaysia |
Where can I find the LT1117IST-3.3#PBF datasheet?
LT1117IST-3.3#PBF Datasheet DownloadOfficial datasheet from Analog Devices
What are equivalent replacements for LT1117IST-3.3#PBF?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the minimum input voltage needed to keep the LT1117IST-3.3#PBF in regulation at full load?
The LT1117IST-3.3#PBF has a typical dropout voltage of 1.1 V and a maximum of 1.3 V. To maintain the 3.3 V output at full 800 mA load, the input must be at least 4.6 V (3.3 V + 1.3 V dropout). The specified minimum input voltage is 4.75 V, which provides additional margin across temperature.
Can the LT1117IST-3.3#PBF handle the current demands of a microcontroller plus peripherals on a 5 V USB supply?
Yes. The device regulates up to 800 mA output from inputs as low as 4.75 V, making a 5 V USB rail a suitable input. A typical ARM Cortex-M MCU draws 50–150 mA at 3.3 V, leaving hundreds of milliamps for Wi-Fi modules, sensors, and other peripherals — well within the 800 mA rating.
How does the SOT-223 package help with thermal management compared to smaller LDO packages?
The SOT-223 package includes an exposed metal tab (pin 4) that is electrically connected to the output. This tab can be soldered to a copper pour on the PCB, significantly reducing thermal resistance — typically to 15–25°C/W junction-to-board — compared to SOT-89 or SC-70 packages at 100°C/W or more. At 800 mA with 1.7 V drop, power dissipation is 1.36 W, manageable with moderate copper area.
How does the LT1117IST-3.3#PBF compare to its adjustable sibling LT1117IST#PBF?
The LT1117IST-3.3#PBF is pin-configured to output a fixed 3.3 V without external resistors, reducing BOM and eliminating resistor tolerance errors. The adjustable version supports 1.25 V to 13.8 V via 2 external resistors. When 3.3 V is the only required rail and simplicity matters, the fixed version is the preferred choice.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $4.7400 | $4.74 |
| 3+ | $3.1600 | $9.48 |
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