REG103GA-A Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The REG103GA-A is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications with 500mA current capability in a SOT-223-6 surface mount package. This device operates across an input voltage range of up to 15V and provides adjustable output voltage from 1.295V to 5.5V with integrated over-current and over-temperature protection features.

The REG103GA-A currently holds Last Time Buy status, indicating end-of-life transition. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications requiring this regulator topology.

Substiute Parts

REG103GA-A

Texas InstrumentsIn Stock: 2276REG103GA-A Datasheet

Current PartRFQ

TPS7A2601DRVR

Texas InstrumentsIn Stock: 20414TPS7A2601DRVR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the REG103GA-A is determined by the following critical parameters:

Output configuration must remain positive adjustable with single regulator topology. Current output capability must meet or exceed 500mA. Input voltage maximum rating must accommodate the application's supply voltage (REG103GA-A rated to 15V maximum). Output voltage range must encompass the required adjustment window. Dropout voltage characteristics must be compatible with the power supply margin available in the application. Operating temperature range must cover the intended deployment environment. Surface mount packaging is required for PCB compatibility. RoHS3 compliance and REACH unaffected status must be maintained for regulatory alignment.

The TPS7A2601DRVR qualifies as a manufacturer-recommended substitute based on these criteria.

Parameter Comparison

Engineering Selection Recommendations

The TPS7A2601DRVR is the manufacturer-recommended substitute for the REG103GA-A. Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity.

The TPS7A2601DRVR offers extended product lifecycle status (Active versus Last Time Buy), providing long-term supply availability. The substitute device features improved specifications across multiple parameters: higher input voltage rating (18V versus 15V), wider output voltage range (1.24V to 17.4V versus 1.295V to 5.5V), extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), and superior moisture sensitivity rating (MSL 1 Unlimited versus MSL 2 1 Year).

The primary design consideration is package footprint transition from SOT-223-6 to 6-WDFN Exposed Pad, which requires PCB layout modification. The TPS7A2601DRVR exhibits higher dropout voltage (0.55V versus 0.28V at 500mA), which must be evaluated against available power supply margin in the application circuit.

Frequently Asked Questions (FAQ)

Q: Can the TPS7A2601DRVR directly replace the REG103GA-A without PCB modification?

A: No. The TPS7A2601DRVR uses a 6-WDFN Exposed Pad package while the REG103GA-A uses SOT-223-6. PCB layout redesign is required to accommodate the different footprint, pin configuration, and thermal characteristics.

Q: What is the impact of the higher dropout voltage in the TPS7A2601DRVR?

A: The TPS7A2601DRVR has 0.55V dropout at 500mA compared to 0.28V for the REG103GA-A. This means the input voltage must be at least 0.55V higher than the desired output voltage. Applications with tight power supply margins must verify this specification against their circuit requirements.

Q: Are there functional differences in control features between these devices?

A: The TPS7A2601DRVR includes Power Good output and Under Voltage Lockout (UVLO) protection in addition to the Enable control feature present in both devices. The REG103GA-A provides Enable control only. These additional features in the substitute may require circuit design adjustments.

Q: Does the wider output voltage range of the TPS7A2601DRVR affect compatibility?

A: The TPS7A2601DRVR output range (1.24V to 17.4V) encompasses the REG103GA-A range (1.295V to 5.5V). Applications designed for the REG103GA-A output voltage window remain compatible. The extended range provides flexibility for future design modifications.

Q: What is the significance of the MSL rating difference?

A: The REG103GA-A has MSL 2 (1 Year shelf life under controlled humidity), while the TPS7A2601DRVR has MSL 1 (Unlimited shelf life). The TPS7A2601DRVR offers superior moisture resistance and longer storage capability without baking requirements.

Q: Is the extended operating temperature range of the TPS7A2601DRVR a concern?

A: No. The TPS7A2601DRVR operating range (-40°C to 125°C) exceeds the REG103GA-A range (-40°C to 85°C). Applications operating within the REG103GA-A temperature window remain fully compatible. The extended range provides margin for thermal stress conditions.