REG103UA-A Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The REG103UA-A is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This device delivers 500mA output current in an 8-SOIC surface mount package and operates across -40°C to 85°C. The part is currently in Last Time Buy status, indicating end-of-life transition. Identifying qualified substitute components ensures design continuity and supply chain reliability for applications requiring equivalent or enhanced performance characteristics.

Key Parameters

Parameter	REG103UA-A
Manufacturer	Texas Instruments
Output Configuration	Positive Adjustable
Output Current	500mA
Input Voltage (Max)	15V
Output Voltage Range	1.295V to 5.5V
Dropout Voltage (Max)	0.28V @ 500mA
Quiescent Current	0.7mA
Package	8-SOIC
Operating Temperature	-40°C to 85°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Output current capability of 500mA or greater
Positive adjustable output configuration
Input voltage maximum rating of 15V or higher
Output voltage adjustability spanning the 1.295V to 5.5V range or broader
Surface mount technology compatibility
Dropout voltage performance suitable for the application
Compliance with ROHS3 and REACH requirements

The TPS7A2601DRVR qualifies as a manufacturer-recommended substitute based on these criteria. While it employs a different package format (6-WSON versus 8-SOIC), it maintains functional equivalence through superior electrical performance and active product status.

Parameter Comparison

Parameter	REG103UA-A	TPS7A2601DRVR	Compatibility Notes
Manufacturer	Texas Instruments	Texas Instruments	Same source
Output Configuration	Positive Adjustable	Positive Adjustable	Functionally equivalent
Output Current	500mA	500mA	Matched specification
Input Voltage (Max)	15V	18V	Substitute rated higher
Output Voltage Range	1.295V to 5.5V	1.24V to 17.4V	Substitute offers wider range
Dropout Voltage (Max)	0.28V @ 500mA	0.55V @ 500mA	Original has lower dropout
Quiescent Current	0.7mA	5µA	Substitute significantly lower
Package	8-SOIC	6-WSON (2x2)	Different footprint; PCB redesign required
Operating Temperature	-40°C to 85°C	-40°C to 125°C	Substitute rated to higher temperature
Product Status	Last Time Buy	Active	Substitute actively manufactured
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature, UVLO	Substitute includes additional protection
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Both compliant

Engineering Selection Recommendations

The TPS7A2601DRVR is the manufacturer-recommended substitute for the REG103UA-A. Selection should be based on the following factors:

Product Status Consideration: The REG103UA-A is in Last Time Buy status, indicating limited future availability. The TPS7A2601DRVR maintains Active product status with 20,400 units in stock, ensuring long-term supply continuity.

Compliance Alignment: Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent designs.

Performance Trade-offs: The TPS7A2601DRVR provides enhanced specifications including lower quiescent current (5µA versus 0.7mA), wider output voltage range (1.24V to 17.4V), and extended operating temperature range (-40°C to 125°C). The dropout voltage is higher (0.55V versus 0.28V), which may impact applications with tight input-to-output voltage margins.

Package Transition: The shift from 8-SOIC to 6-WSON (2x2) requires PCB layout modification. The smaller footprint may provide space optimization benefits in constrained designs.

Frequently Asked Questions (FAQ)

Q: Can the TPS7A2601DRVR directly replace the REG103UA-A without PCB changes?

A: No. The TPS7A2601DRVR uses a 6-WSON (2x2) package versus the 8-SOIC package of the REG103UA-A. PCB footprint redesign is required. Pin configuration and functionality differ; schematic review is necessary.

Q: What is the primary reason to substitute the REG103UA-A?

A: The REG103UA-A is in Last Time Buy status. The TPS7A2601DRVR is an active product with superior availability and enhanced electrical performance, making it suitable for new designs or production transitions.

Q: Are there electrical performance differences that affect circuit operation?

A: Yes. The TPS7A2601DRVR has lower quiescent current (5µA versus 0.7mA) and higher dropout voltage (0.55V versus 0.28V). Applications sensitive to dropout voltage or requiring the original's lower quiescent current must evaluate these differences against system requirements.

Q: Do both devices support the same output voltage adjustment range?

A: The TPS7A2601DRVR supports a wider output voltage range (1.24V to 17.4V) compared to the REG103UA-A (1.295V to 5.5V). Both devices can be configured for the REG103UA-A's original output voltage specifications.

Q: What additional protection features does the TPS7A2601DRVR provide?

A: The TPS7A2601DRVR includes Under Voltage Lockout (UVLO) protection in addition to the Over Current and Over Temperature protection present in both devices. It also includes a Power Good output feature.

Q: Are both devices RoHS and REACH compliant?

A: Yes. Both the REG103UA-A and TPS7A2601DRVR are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for equivalent component selection.

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