LP2950ACDT-5.0RK Equivalent & Substitute Parts

Part Overview

The LP2950ACDT-5.0RK is a linear voltage regulator IC from onsemi, delivering a fixed 5V output at 100mA in a DPAK surface mount package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production requirements. The LP2950 series provides micropower voltage regulation with integrated over-current and over-temperature protection, suitable for applications requiring low-quiescent-current regulation from input sources up to 30V.

Substiute Parts

LP2950ACDT-5.0RK

onsemiIn Stock: 950LP2950ACDT-5.0RK Datasheet

Current PartRFQ

LP2950ACDT-5RKG

onsemiIn Stock: 2463LP2950ACDT-5RKG Datasheet

DirectRFQ

LP2950CDT-5.0RKG

onsemiIn Stock: 17864LP2950CDT-5.0RKG Datasheet

Parametric EquivalentRFQ

BA05CC0FP-E2

Rohm SemiconductorIn Stock: 40700BA05CC0FP-E2 Datasheet

SimilarRFQ

LP2950CDT-5.0/NOPB

National SemiconductorIn Stock: 1178LP2950CDT-5.0/NOPB Datasheet

SimilarRFQ

LP2950CDTX-5.0/NOPB

National SemiconductorIn Stock: 6403LP2950CDTX-5.0/NOPB Datasheet

SimilarRFQ

SM72238TDE-5.0/NOPB

National SemiconductorIn Stock: 2070SM72238TDE-5.0/NOPB Datasheet

Parametric EquivalentRFQ

SM72238TDX-5.0/NOPB

Texas InstrumentsIn Stock: 1339SM72238TDX-5.0/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP2950ACDT-5.0RK is determined by the following critical parameters:

• Fixed output voltage of 5V
• Output current capability of 100mA minimum
• Input voltage tolerance up to 30V
• Surface mount DPAK package (TO-252-3)
• Operating temperature range -40°C to 125°C
• Over-current and over-temperature protection

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents: Parts from onsemi with identical electrical specifications and active product status, differing only in packaging configuration or RoHS compliance revision.

Parametric Equivalents: Parts from alternative manufacturers (National Semiconductor, Texas Instruments, Rohm Semiconductor) that meet or exceed the electrical requirements and share the same package footprint, though with minor variations in quiescent current or dropout voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LP2950ACDT-5RKG or LP2950CDT-5.0RKG from onsemi. Both are active products with ROHS3 compliance and identical electrical specifications to the obsolete LP2950ACDT-5.0RK. These represent the most direct path for design continuation with current manufacturing support.

Secondary Recommendation: LP2950CDT-5.0/NOPB or LP2950CDTX-5.0/NOPB from National Semiconductor. These maintain the 100mA output current and 5V fixed output with active product status. The 0.6V dropout voltage specification is marginally higher than the original part but remains within acceptable tolerance for most applications. Both are in active production with established supply chains.

Alternative for Higher Current Applications: BA05CC0FP-E2 from Rohm Semiconductor. This part provides 1A output current in the same TO-252-3 package with ROHS3 compliance and active status. Selection of this part is appropriate only when the application requires output current exceeding 100mA, as the higher quiescent current (2.5 mA vs. 120 µA) may impact low-power circuit performance.

Tertiary Option: SM72238TDX-5.0/NOPB from Texas Instruments. This part meets all electrical requirements with ROHS3 compliance and active product status. The slightly elevated quiescent current (140 µA) is negligible for most applications and remains within the micropower category.

Frequently Asked Questions (FAQ)

Q: Can LP2950ACDT-5RKG directly replace LP2950ACDT-5.0RK in existing designs?

A: Yes. Both parts share identical electrical specifications (5V output, 100mA current, 0.45V dropout voltage, 120 µA quiescent current) and the same TO-252-3 DPAK package footprint. The primary difference is product status (active vs. obsolete) and RoHS compliance revision. No circuit modifications are required.

Q: What is the difference between LP2950CDT-5.0RKG and LP2950ACDT-5RKG?

A: Both are onsemi active products with identical electrical performance and package type. The designation difference reflects internal manufacturing or qualification variations. Either part is suitable for direct substitution of the obsolete LP2950ACDT-5.0RK.

Q: Why does LP2950CDT-5.0/NOPB show 0.6V dropout voltage instead of 0.45V?

A: This represents a specification difference between manufacturers. The 0.6V dropout voltage from National Semiconductor remains within acceptable operating margins for most 5V regulation applications. Verify dropout voltage requirements in your specific circuit design before selection.

Q: Is BA05CC0FP-E2 a suitable substitute for the LP2950ACDT-5.0RK?

A: BA05CC0FP-E2 is a parametric equivalent suitable only if your application requires output current exceeding 100mA. This part delivers 1A output current in the same package. However, the quiescent current is significantly higher (2.5 mA vs. 120 µA), which may impact low-power circuit designs. Use this part only when higher current capacity is a design requirement.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitute parts use the TO-252-3 DPAK package with identical pin configuration and footprint. No PCB layout modifications are required for any of these substitutions.

Q: Which substitute part has the best RoHS compliance status?

A: LP2950ACDT-5RKG, LP2950CDT-5.0RKG, SM72238TDX-5.0/NOPB, and BA05CC0FP-E2 all carry ROHS3 compliance certification. These are the recommended selections for applications with RoHS compliance requirements.

Q: Can I use SM72238TDX-5.0/NOPB as a direct replacement?

A: Yes. This Texas Instruments part meets all electrical requirements with active product status and ROHS3 compliance. The quiescent current is slightly elevated (140 µA vs. 120 µA), which is negligible for most applications. The part is suitable for direct substitution in the same TO-252-3 package.