REG103UA-2.5 Equivalent & Substitute Parts

Part Overview

The REG103UA-2.5 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 2.5V output applications with 500mA current capacity in an 8-SOIC package. This part is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability for applications requiring 2.5V regulation.

Substiute Parts

REG103UA-2.5

Texas InstrumentsIn Stock: 3451REG103UA-2.5 Datasheet

Current PartRFQ

TPS7A2625DRVR

Texas InstrumentsIn Stock: 3628TPS7A2625DRVR Datasheet

MFR RecommendedRFQ

TC1263-2.5VOA

Microchip TechnologyIn Stock: 1210TC1263-2.5VOA Datasheet

MFR RecommendedRFQ

TC1263-2.5VOATR

Microchip TechnologyIn Stock: 1984TC1263-2.5VOATR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the REG103UA-2.5 is determined by the following critical parameters:

• Output Voltage: Must be fixed at 2.5V
• Output Current Capacity: Minimum 500mA
• Input Voltage Range: Must accommodate the application's supply voltage
• Voltage Dropout: Lower dropout is beneficial but not mandatory for substitution
• Package Compatibility: Surface mount packages with compatible pinouts
• Control Features: Enable function required; additional features (Power Good, UVLO) are acceptable enhancements
• Protection Features: Over Current and Over Temperature protection required
• Compliance: ROHS3 and REACH compliance maintained

The substitute parts listed below meet or exceed these core electrical and mechanical requirements while offering improved or equivalent performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

TPS7A2625DRVR (Texas Instruments, Active Status)

This part is the manufacturer-recommended substitute from Texas Instruments. It maintains the same output voltage and current specifications while offering superior performance: lower quiescent current (4.5 µA vs. 0.7 mA), higher input voltage rating (18V vs. 15V), and extended operating temperature range (-40°C ~ 125°C). The 6-WSON package requires PCB layout redesign due to different pinout and footprint. This option is suitable for new designs or redesigns where package migration is acceptable.

TC1263-2.5VOA / TC1263-2.5VOATR (Microchip Technology, Active Status)

Both TC1263 variants provide direct package compatibility with the REG103UA-2.5 in 8-SOIC form factor, minimizing PCB redesign requirements. The primary trade-off is reduced maximum input voltage (6V vs. 15V), which limits applicability to low-voltage supply systems. These parts are suitable for applications with input voltages not exceeding 6V and where package compatibility is prioritized. TC1263-2.5VOATR offers tape & reel packaging for high-volume production, while TC1263-2.5VOA is supplied in tube format.

All substitute parts maintain ROHS3 compliance, REACH compliance, and required protection features (Over Current, Over Temperature). Selection should be based on input voltage requirements, package constraints, and production volume considerations.

Frequently Asked Questions (FAQ)

Q: Can TPS7A2625DRVR be used as a direct replacement without PCB modification?

A: No. The TPS7A2625DRVR uses a 6-WSON (2x2) package versus the 8-SOIC package of the REG103UA-2.5. PCB layout redesign is required, including new footprint, trace routing, and potentially different thermal management considerations. Pin assignments differ between packages.

Q: What is the maximum input voltage for TC1263 substitutes?

A: The TC1263-2.5VOA and TC1263-2.5VOATR are rated for maximum input voltage of 6V. The REG103UA-2.5 supports 15V input. Applications requiring input voltages above 6V must use TPS7A2625DRVR or retain the original part.

Q: Are TC1263-2.5VOA and TC1263-2.5VOATR electrically identical?

A: Yes. Both parts are electrically identical. The difference is packaging format: TC1263-2.5VOA is supplied in tube format, while TC1263-2.5VOATR is supplied in tape & reel format for automated assembly. Selection depends on production volume and assembly process requirements.

Q: What is the impact of higher voltage dropout in TC1263 parts?

A: The TC1263 series has 0.65V dropout at 500mA compared to 0.28V for REG103UA-2.5. This means the minimum input voltage must be approximately 0.37V higher to maintain 2.5V output at full load. For applications with tight input voltage margins, this may be a limiting factor.

Q: Does TPS7A2625DRVR offer any advantages beyond package differences?

A: Yes. TPS7A2625DRVR provides significantly lower quiescent current (4.5 µA vs. 0.7 mA), higher input voltage rating (18V vs. 15V), extended temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C), and additional control features (Power Good output, UVLO protection). These improvements justify package migration for applications where these features provide value.

Q: What is the MSL (Moisture Sensitivity Level) difference, and does it matter?

A: REG103UA-2.5 has MSL 2 (1 Year shelf life), while all substitutes have MSL 1 (Unlimited shelf life). MSL 1 parts are less sensitive to moisture absorption and have longer usable shelf life, providing supply chain advantages.

Q: Can I use TPS7A2625DRVR in applications requiring 8-SOIC package?

A: No. TPS7A2625DRVR uses 6-WSON package. If 8-SOIC package is a hard requirement, use TC1263-2.5VOA or TC1263-2.5VOATR, provided input voltage does not exceed 6V.