TL1963A-33DCYR Texas Instruments Power Supply (SOT223 (3-Pin)) In Stock
The TL1963A-33DCYR is a fixed 3.3V, 1.5A low-dropout linear regulator with a maximum dropout voltage of 0.55V, operating from 3.8V to 20V input. It delivers low-noise, fast transient response output in a compact SOT-223 surface-mount package. Available from stock worldwide for power-sensitive analog and digital applications.
- Manufacturer
- Texas Instruments
- Package
- SOT223 (3-Pin)
- Pin Count
- 4
- Lifecycle
- ACTIVE
- Datasheet
- TL1963A-33DCYR Datasheet PDF
- Category
- Power Supply
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Fixed 3.3V output with 1.5A continuous current capability and ultra-low dropout voltage of only 0.34V typical (0.55V max), enabling efficient regulation from near-3.3V inputs
- Low-noise, fast transient response design with excellent PSRR makes it ideal for noise-sensitive RF, ADC, and precision analog circuits
- Wide input voltage range from 3.8V to 20V in a compact SOT-223 package with exposed pad for enhanced thermal dissipation in space-constrained designs
Applications
The TL1963A-33DCYR is well-suited for powering noise-sensitive analog circuits such as ADCs, DACs, RF modules, and PLLs where power supply noise directly impacts signal integrity. Its fast transient response makes it an excellent post-regulator after switching converters to clean up switching noise for sensitive loads. The SOT-223 package and 1.5A output capacity also make it practical for powering FPGAs, DSPs, and digital logic requiring a clean 3.3V rail.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 0.55V |
| Dropout Voltage1-Nom | 0.34V |
| Input Voltage Absolute-Max | 20V |
| Input Voltage-Max | 20V |
| Input Voltage-Min | 3.8V |
| JESD-30 Code | R-PDSO-G4 |
| JESD-609 Code | e3 |
| Line Regulation-Max | 0.01% |
| Load Regulation-Max | 0.07% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 125°C |
| Operating Temperature TJ-Min | -40 °C |
| Output Current1-Max | 1.5A |
| Output Voltage1-Max | 3.4V |
| Output Voltage1-Min | 3.2V |
| Output Voltage1-Nom | 3.3V |
| 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 |
| 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 | 3% |
| Package | SOT223 (3-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 2 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for TL1963A-33DCYR:
suggested
Frequently Asked Questions
What is the dropout voltage of the TL1963A-33DCYR and what does it mean for input voltage selection?
The TL1963A-33DCYR has a typical dropout voltage of 0.34V and a maximum of 0.55V at full 1.5A load. This means the minimum input voltage to maintain regulation at 3.3V output is approximately 3.85V typical, making it usable directly from a single lithium-ion cell in many configurations.
What output current can the TL1963A-33DCYR supply continuously?
The TL1963A-33DCYR can supply up to 1.5A of continuous output current at 3.3V. Thermal performance depends on the PCB layout and heatsinking of the SOT-223 package. The exposed thermal pad on the SOT-223 helps dissipate heat to the PCB copper pour for reliable operation at higher current levels.
Why is the TL1963A-33DCYR preferred for noise-sensitive analog applications?
The TL1963A-33DCYR features a low-noise output and high power supply rejection ratio (PSRR), which attenuates input voltage ripple and switching noise from upstream converters. This makes it ideal for powering precision analog circuits like ADCs, DACs, and RF amplifiers where power supply noise can degrade dynamic range and signal fidelity.
What package does the TL1963A-33DCYR use and what does the suffix mean?
The TL1963A-33DCYR uses the SOT-223 surface-mount package (4-pin, JESD-30 code R-PDSO-G4). The '33' in the part number indicates a fixed 3.3V output, 'DC' refers to the SOT-223 package, 'Y' indicates tape and reel packaging, and 'R' denotes the reel format for automated assembly.
Is there an adjustable version of the TL1963A and how does it differ from the TL1963A-33DCYR?
Yes, the TL1963A is also available in an adjustable output version where the output voltage is set using two external resistors, allowing voltages from 1.21V to approximately 10V. The TL1963A-33DCYR is the fixed 3.3V variant, which simplifies design by eliminating external resistors and reducing BOM cost for applications that always require 3.3V.
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Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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