MIC5318-3.3YD5 TR Microchip Integrated Circuit (SOT23 (5-Pin)) In Stock
MIC5318-3.3YD5 TR is a fixed 3.3 V, 300 mA positive LDO linear regulator by Microchip Technology. Key specs: 3.3 V output, 300 mA output current, low-dropout design in a compact 5-pin TSOT-23 package. Available in stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- ACTIVE
- Datasheet
- MIC5318-3.3YD5 TR Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Fixed 3.3 V output at up to 300 mA with low-dropout architecture minimizes power dissipation when the input rail is close to 3.3 V
- Ultra-compact 5-pin TSOT-23 package occupies minimal PCB area, ideal for space-constrained battery-powered and wearable device designs
- Tape-and-reel (T/R) packaging supports automated pick-and-place assembly at high production volumes
Applications
MIC5318-3.3YD5 TR is designed for post-regulation in battery-powered consumer electronics, IoT sensor nodes, and wearable devices where a stable 3.3 V rail at up to 300 mA is required with minimum board space. Its low-dropout characteristic reduces input voltage requirements, extending battery runtime in 3.6 V Li-ion and 3 V coin-cell powered applications. The device also provides local decoupling regulation for 3.3 V microcontrollers and RF modules in wireless communication designs powered from a 5 V USB or adapter input.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
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 current of MIC5318-3.3YD5 TR?
MIC5318-3.3YD5 TR provides a fixed 3.3 V output with a maximum continuous output current of 300 mA. The LDO architecture allows operation with an input voltage as low as a few hundred millivolts above 3.3 V, making it efficient for 3.6 V Li-ion battery applications where a switching regulator would add unnecessary cost and EMI at these current levels.
For which battery-powered applications does MIC5318-3.3YD5 TR offer the best efficiency advantage?
MIC5318-3.3YD5 TR is most efficient when powered from a 3.6 V to 4.2 V Li-ion cell where the headroom above 3.3 V is only 0.3 V to 0.9 V, resulting in power dissipation of 90 mW to 270 mW at 300 mA load — manageable within the TSOT-23 package's thermal envelope. For IoT sensor nodes drawing 10–50 mA in active mode and much less in sleep, the dropout loss is negligible and the simplicity of an LDO versus a buck converter saves 5–10 additional BOM components.
How does the 5-pin TSOT-23 package of MIC5318-3.3YD5 TR compare with SOT-23-3 regulators in PCB layout density?
The 5-pin TSOT-23 package has the same 2.9 mm x 1.6 mm body footprint as the 3-pin SOT-23 but adds enable and output sense pins, providing power-on sequencing control without increasing PCB area. Compared with 8-pin SOIC LDO alternatives, the TSOT-23 reduces copper land area by approximately 70%, enabling placement in sub-5 mm x 5 mm constrained zones common in smartwatch and hearing-aid PCB designs.
What input voltage range is compatible with MIC5318-3.3YD5 TR when powering 3.3 V logic from a 5 V USB rail?
When powered from a 5 V USB source, MIC5318-3.3YD5 TR operates with 1.7 V of headroom above its 3.3 V output, well above the typical LDO dropout voltage of 200–500 mV at 300 mA. The regulator dissipates 510 mW at full 300 mA load from 5 V input, which requires attention to thermal derating in still-air conditions but is manageable for normal 50–150 mA logic supply duties in USB-powered embedded controller boards.
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