REG103UA-2.5G4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
REG103UA-2.5G4 is a fixed 2.5 V, 500 mA LDO linear regulator with ultra-low 115 mV typical dropout voltage and ±2% output accuracy. It accepts inputs from 2.7 V to 15 V in an 8-pin SOIC package for precision analog and mixed-signal supply rails. Available from Texas Instruments with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- REG103UA-2.5G4 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
What are the key features of REG103UA-2.5G4?
- Fixed 2.5 V output with ±2% accuracy providing stable reference-grade voltage for ADC, DAC, and precision analog supply rails
- Ultra-low 115 mV typical dropout voltage allowing operation from nearly exhausted battery supplies down to 2.7 V input
- 500 mA continuous output current supporting mid-power DSP, FPGA I/O, and analog front-end subsystems
- Wide 2.7 V to 15 V input range accommodating automotive 12 V rails, 5 V USB supplies, and single-cell Li-ion batteries
- Low 0.0875% maximum line regulation maintaining tight output voltage across varying input conditions in sensitive RF and instrumentation circuits
What is REG103UA-2.5G4 used for?
REG103UA-2.5G4 is used to power precision ADC and DAC reference circuits, analog front-ends, and mixed-signal sensor interfaces that require a stable, low-noise 2.5 V rail. Its ultra-low dropout of 115 mV makes it suitable for battery-powered instrumentation operating from a nearly depleted 3 V lithium cell. The wide 2.7 V to 15 V input range also supports post-regulation from 5 V or 12 V industrial supplies in data acquisition and signal conditioning boards.
What are the specifications of REG103UA-2.5G4?
| YTEOL | 0 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 0.2V |
| Dropout Voltage1-Nom | 0.115V |
| Input Voltage Absolute-Max | 16V |
| Input Voltage-Max | 15V |
| Input Voltage-Min | 2.7V |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Line Regulation-Max | 0.0875% |
| Load Regulation-Max | 0.0875% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 125°C |
| Operating Temperature TJ-Min | -55 °C |
| Output Current1-Max | 0.5A |
| Output Voltage1-Max | 2.55V |
| Output Voltage1-Min | 2.45V |
| Output Voltage1-Nom | 2.5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | RAIL |
| 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 |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Voltage Tolerance-Max | 2.8% |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 2 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the REG103UA-2.5G4 datasheet?
REG103UA-2.5G4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for REG103UA-2.5G4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What dropout voltage does REG103UA-2.5G4 achieve and why does that matter for battery-powered designs?
REG103UA-2.5G4 has a typical dropout voltage of only 115 mV, meaning it regulates a stable 2.5 V output from an input as low as 2.615 V. This allows a lithium coin cell or Li-ion battery to power the regulator even as the cell discharges from 3.0 V toward end-of-life, extending useful runtime compared to regulators requiring 500 mV or more of headroom.
How does REG103UA-2.5G4 perform in a precision ADC reference supply application?
REG103UA-2.5G4 offers ±2% output accuracy and 0.0875% maximum line regulation, keeping its 2.5 V output stable even when the input changes from 3 V to 15 V. For a 12-bit ADC with a 2.5 V full-scale reference, a 2% accuracy limit corresponds to a ±50 mV reference error — acceptable for general-purpose data acquisition and within the tolerance budget of many precision sensor interface designs.
What is the maximum input voltage REG103UA-2.5G4 can handle, and does it suit automotive 12 V systems?
REG103UA-2.5G4 supports up to 15 V continuous input (16 V absolute maximum), making it directly compatible with regulated 12 V automotive supply rails after allowing for load dump transients through an external TVS diode. The 500 mA current capability covers most low-power ECU analog subsystems, sensor interfaces, and in-vehicle communication front-ends requiring a clean 2.5 V rail.
What package does REG103UA-2.5G4 use and how does its footprint compare to SOT-23 LDOs?
REG103UA-2.5G4 uses an 8-pin SOIC package with 1.27 mm pitch, which is larger than a 5-pin SOT-23 but includes additional pins for improved thermal dissipation and output bypass capacitor connections. At 500 mA output current, the SOIC-8 body allows better conduction cooling than SOT-23, reducing junction temperature rise by approximately 30% to 40% under continuous full-load conditions at 25°C ambient.
Related Guides
STM32H725IGT3 Selection Guide: Memory, Package, Temperature, and Supply
Choose the right STM32H725 variant by comparing Flash, package, pin count, temperature grade, connectivity, and production requirements.
Aug 1, 2026
STM32H725IGT3 High-Performance MCU Design Guide
Design STM32H725IGT3 systems for reliable 550 MHz operation with practical power, clock, cache, DMA, PCB, ADC, and recovery guidance.
Jul 31, 2026
150141VS73100 Violet SMD LED Selection Guide: Color, Drive, and Sourcing
Select the 150141VS73100 by wavelength, brightness, drive current, 3528 fit, reliability, and traceable sourcing requirements.
Jul 31, 2026
STEF05SGR 5 V eFuse Protection Design Guide
Design a reliable 5 V STEF05SGR eFuse stage with current-limit math, capacitor sizing, thermal analysis, fault recovery, and PCB layout guidance.
Jul 30, 2026
Why Buy from FindMyChip
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.
More from Texas Instruments
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“We've been using FindMyChip for 2 years. Pricing is consistently 20-30% below Mouser/DigiKey for volume orders.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit