REG101UA-A Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The REG101UA-A is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications with 100mA current capacity in an 8-SOIC surface mount package. This device is classified as Last Time Buy, indicating end-of-life status. Alternative components are necessary to ensure continued design flexibility, long-term supply availability, and access to active product lines with extended support lifecycles.

Substiute Parts

REG101UA-A

Texas InstrumentsIn Stock: 1068REG101UA-A Datasheet

Current PartRFQ

TPS7A2401DBVR

Texas InstrumentsIn Stock: 19846TPS7A2401DBVR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the REG101UA-A is determined by the following critical parameters:

Output configuration must remain positive adjustable to maintain functional compatibility with existing designs. The substitute part must support adjustable output voltage regulation within compatible ranges. Current output capacity of the substitute must equal or exceed 100mA to handle the same load requirements. Input voltage rating must accommodate the maximum 10V input specification. Voltage dropout characteristics must be suitable for the application's input-to-output differential. Operating temperature range must cover the required -40°C ~ 85°C minimum specification. Surface mount packaging is required for PCB compatibility. RoHS3 compliance and REACH unaffected status must be maintained for regulatory alignment.

The TPS7A2401DBVR qualifies as a direct substitute based on these parameters: it maintains positive adjustable output configuration, provides 200mA output current (exceeding the 100mA requirement), supports 18V maximum input (exceeding 10V), offers adjustable output voltage range of 1.24V to 17.75V (encompassing the 2.5V to 5.5V range), operates across -40°C ~ 125°C (exceeding the required range), and maintains RoHS3 compliance and REACH unaffected status.

Parameter Comparison

Engineering Selection Recommendations

The TPS7A2401DBVR is an active product with full manufacturer support, contrasting with the REG101UA-A's Last Time Buy status. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment across supply transitions.

The TPS7A2401DBVR provides enhanced specifications: 200mA output current versus 100mA, 18V maximum input versus 10V, and extended operating temperature range to 125°C. The substitute includes Under Voltage Lockout (UVLO) protection, an additional safeguard not present in the original part. Package differences exist—the TPS7A2401DBVR uses SOT-23-5 versus the REG101UA-A's 8-SOIC—requiring PCB layout modification. Voltage dropout increases to 0.25V at 200mA compared to 0.13V at 100mA, a consideration for low-input-to-output differential applications.

Selection of the TPS7A2401DBVR is appropriate for new designs and supply continuity strategies where package redesign is feasible and enhanced performance specifications are acceptable.

Frequently Asked Questions (FAQ)

Q: Can the TPS7A2401DBVR directly replace the REG101UA-A without PCB modification?

A: No. The TPS7A2401DBVR uses SOT-23-5 packaging while the REG101UA-A uses 8-SOIC. PCB layout redesign is required. Pin configurations differ, necessitating schematic and layout updates.

Q: What are the key functional differences between these parts?

A: Both are positive adjustable linear regulators with enable control and thermal/overcurrent protection. The TPS7A2401DBVR provides doubled output current (200mA vs 100mA), higher input voltage rating (18V vs 10V), wider adjustable output range (1.24V–17.75V vs 2.5V–5.5V), extended temperature range (-40°C to 125°C vs -40°C to 85°C), and additional UVLO protection.

Q: Is the TPS7A2401DBVR suitable for applications requiring the original 100mA specification?

A: Yes. The TPS7A2401DBVR's 200mA rating exceeds the 100mA requirement, providing design margin. Voltage dropout at 100mA operation will be lower than the specified 0.25V @ 200mA maximum.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the REG101UA-A and TPS7A2401DBVR are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Q: Why is the REG101UA-A classified as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued this product line. The TPS7A2401DBVR represents the active alternative within the manufacturer's current portfolio.

Q: What is the impact of increased voltage dropout in the TPS7A2401DBVR?

A: Dropout increases from 0.13V to 0.25V at maximum rated current. For applications with tight input-to-output voltage margins, verify that the substitute's dropout specification remains acceptable at your operating current level.