REG103UA-5G4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The REG103UA-5G4 is a low-dropout linear voltage regulator with a fixed 5 V output and 500 mA maximum output current. It features a 160 mV typical dropout voltage, 0.16% line regulation, and accepts an input voltage from 5.25 V to 15 V. Housed in an 8-pin SOIC package, it suits precision analog power supplies, DSP core rails, and noise-sensitive measurement instruments.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- REG103UA-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
Key Features
- Fixed 5 V output with 500 mA maximum load current
- Ultra-low 160 mV typical dropout voltage at full load
- Input voltage range 5.25 V to 15 V
- 0.16% line regulation for stable precision analog rails
- Low output noise ideal for ADC and RF reference supplies
- 8-pin SOIC package compatible with standard SMT assembly
Applications
The REG103UA-5G4 is used to power precision analog circuitry such as ADC reference rails, op-amp supplies, and instrumentation front-ends where low noise and tight regulation are critical. Its ultra-low dropout voltage enables efficient post-regulation from a 6 V or 7 V bus without generating excess heat. Industrial test equipment, medical monitoring devices, and portable data loggers rely on this regulator for clean 5 V analog power alongside higher-current switching supplies.
Specifications
| YTEOL | 0 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 0.25V |
| Dropout Voltage1-Nom | 0.16V |
| Input Voltage Absolute-Max | 16V |
| Input Voltage-Max | 15V |
| Input Voltage-Min | 5.25V |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Line Regulation-Max | 0.16% |
| Load Regulation-Max | 0.175% |
| 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 | 5.1V |
| Output Voltage1-Min | 4.9V |
| Output Voltage1-Nom | 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 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for REG103UA-5G4:
Frequently Asked Questions
What is the typical dropout voltage of REG103UA-5G4 at its rated 500 mA output current?
The REG103UA-5G4 has a typical dropout voltage of 160 mV at 500 mA output current, and a maximum specified value of 250 mV. This allows the device to maintain a regulated 5 V output from an input as low as 5.25 V, making it efficient in battery-backed or tightly constrained power budgets.
How does REG103UA-5G4 perform in noise-sensitive analog measurement applications?
The device features low output noise and 0.16% maximum line regulation, making it well suited for powering 16-bit or higher ADC reference circuits, precision op-amp stages, and strain-gauge bridges where supply noise directly impacts measurement accuracy. Its LDO topology avoids switching noise entirely.
Which input voltage range is required to keep REG103UA-5G4 in regulation?
The regulator requires an input voltage between 5.25 V minimum and 15 V maximum to maintain the regulated 5 V output. The 250 mV maximum dropout headroom must be observed at the minimum input, ensuring the regulator does not enter dropout and cause output voltage sag at heavy loads.
For a portable data logger running from a 9 V supply, how does REG103UA-5G4 compare to a switching regulator?
At 9 V input and 500 mA load, REG103UA-5G4 dissipates about 2 W as heat, while a switching regulator would be more efficient. However, the LDO produces zero switching ripple, which is critical for 12-bit or 16-bit ADC accuracy in portable data loggers where a switching ripple of even 10 mV can degrade measurement resolution.
What PCB footprint does REG103UA-5G4 use, and what external components are required?
The device uses an 8-pin SOIC (R-PDSO-G8) package with a standard 1.27 mm lead pitch. It requires only a 10 µF output bypass capacitor and an optional 1 µF input capacitor for stable operation, minimising BOM cost and board area in compact analog power supply designs.
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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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