REG113NA-3.3/250 Texas Instruments Integrated Circuit (SOT23 (5-Pin)) In Stock
REG113NA-3.3/250 is a fixed 3.3V LDO linear regulator from Texas Instruments delivering 400mA output with 250mV typical dropout voltage and 3.7V to 10V input range. Available in a compact SOT-23-5 package, it is well-suited for portable battery-powered devices and mixed-signal board 3.3V rail regulation.
- Manufacturer
- Texas Instruments
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- ACTIVE
- Datasheet
- REG113NA-3.3/250 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Fixed 3.3V output at 400mA with only 250mV typical dropout voltage, enabling efficient regulation from 4AA batteries or single-cell Li-ion packs down to 3.3V
- Wide 3.7V to 10V input range accommodates diverse power sources including 5V USB adapters, 6V NiMH packs, and 9V alkaline batteries in portable designs
- Tiny SOT-23-5 package minimizes PCB footprint for 3.3V supply circuits in space-constrained consumer electronics, IoT nodes, and wearable devices
Applications
REG113NA-3.3/250 provides a stable 3.3V regulated supply for microcontrollers, wireless modules, and sensors in portable battery-operated devices such as IoT sensors, GPS trackers, and handheld instruments. Its 400mA current capacity and 250mV dropout voltage support continuous operation from a single-cell lithium-ion battery discharging from 4.2V down to approximately 3.5V. The SOT-23-5 footprint makes it ideal for multi-layer PCBs in compact smart home devices and wearables where linear regulation is preferred over switching for noise-sensitive analog and RF circuits.
Specifications
| Pbfree Code | Yes |
| Reach Compliance Code | Compliant |
| YTEOL | 15 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 0.41V |
| Dropout Voltage1-Nom | 0.25V |
| Input Voltage Absolute-Max | 12V |
| Input Voltage-Max | 10V |
| Input Voltage-Min | 3.7V |
| JESD-30 Code | R-PDSO-G5 |
| JESD-609 Code | e4 |
| Line Regulation-Max | 0.099% |
| Load Regulation-Max | 0.099% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 85°C |
| Operating Temperature TJ-Min | -40 °C |
| Output Current1-Max | 0.4A |
| Output Voltage1-Max | 3.399V |
| Output Voltage1-Min | 3.201V |
| Output Voltage1-Nom | 3.3V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSOP5/6,.11,37 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, LOW PROFILE, SHRINK PITCH |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Regulator Type | FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR |
| Surface Mount | YES |
| Technology | NMOS |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.95mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Voltage Tolerance-Max | 2.3% |
| ## REG113NA-3.3/250 Alternates Showing results | Image |
| Package | SOT23 (5-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the dropout voltage of REG113NA-3.3/250 and how does it affect battery life in portable designs?
REG113NA-3.3/250 has a typical dropout voltage of 250mV and a maximum of 410mV at 400mA output. With a lithium-ion battery discharging from 4.2V to its cutoff, the regulator maintains a stable 3.3V output until the battery voltage drops to approximately 3.55V, extending usable battery life compared to regulators with 500mV or higher dropout that lose regulation 250mV earlier in the discharge curve.
What input voltage range does REG113NA-3.3/250 support and which power sources are compatible?
REG113NA-3.3/250 operates from a minimum input of 3.7V to a maximum of 10V, with an absolute maximum of 12V. This range supports 4AA alkaline batteries at 6V, single-cell lithium-ion packs at 3.7V to 4.2V, standard 5V USB power, and 9V wall adapters, making it versatile for multiple portable device power architectures without requiring input protection components at typical operating voltages.
How does REG113NA-3.3/250's SOT-23-5 package compare to larger SOT-223 packages for heat dissipation at 400mA?
The SOT-23-5 package has a junction-to-ambient thermal resistance around 250°C/W, which limits maximum power dissipation to roughly 300mW to 500mW in free-air at 25°C ambient. At 400mA with a 5V input and 3.3V output, the device dissipates 680mW ((5V - 3.3V) x 0.4A), which may exceed the SOT-23-5 thermal budget and require PCB copper area for heat spreading. Designers should verify junction temperature stays below 125°C maximum at their worst-case input voltage and load conditions.
For a 3.3V microcontroller node powered from a 9V alkaline battery, is REG113NA-3.3/250 the right choice?
REG113NA-3.3/250 can regulate 9V input down to 3.3V at up to 400mA, well within its 10V maximum input rating. However, the power dissipation at 9V input and 100mA load would be (9V - 3.3V) x 0.1A = 570mW, approaching the SOT-23-5 thermal limit. For low-current MCU nodes drawing under 50mA average, the device operates comfortably and the 9V battery provides good regulation headroom. For higher-current loads from a 9V source, a switching pre-regulator or a higher-current LDO in a larger package may be more appropriate.
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About Texas Instruments
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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