LP2950CDTX-3.3 Equivalent & Substitute Parts

Part Overview

The LP2950CDTX-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 3.3V output at 100mA in a TO-252-3 (DPAK) surface mount package. The device is currently marked as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. This reference page identifies compatible alternatives based on electrical and mechanical parameter alignment.

Substiute Parts

LP2950CDTX-3.3

Texas InstrumentsIn Stock: 2919LP2950CDTX-3.3 Datasheet

Current PartRFQ

LP2950CDTX-3.3/NOPB

Texas InstrumentsIn Stock: 110265LP2950CDTX-3.3/NOPB Datasheet

DirectRFQ

BA033CC0FP-E2

Rohm SemiconductorIn Stock: 35204BA033CC0FP-E2 Datasheet

MFR RecommendedRFQ

LD29150DT33R

STMicroelectronicsIn Stock: 33000LD29150DT33R Datasheet

MFR RecommendedRFQ

LP2950ACDT-3.3RG

onsemiIn Stock: 1015LP2950ACDT-3.3RG Datasheet

MFR RecommendedRFQ

LP2950CDT-3.3G

onsemiIn Stock: 2142LP2950CDT-3.3G Datasheet

MFR RecommendedRFQ

LP2950CDT-3.3RKG

onsemiIn Stock: 38664LP2950CDT-3.3RKG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP2950CDTX-3.3 is determined by the following critical parameters:

• Output Voltage: Must be fixed at 3.3V
• Package / Case: Must be TO-252-3 (DPAK) surface mount
• Operating Temperature Range: Must support -40°C ~ 125°C minimum
• Output Configuration: Must be positive fixed output
• Protection Features: Must include Over Current and Over Temperature protection

Substitute parts are grouped into two categories:

Category 1 - Direct Equivalents (100mA Output Current): Parts with identical or superior electrical specifications at the same 100mA output current rating, maintaining full pin and functional compatibility.

Category 2 - Higher Current Alternatives (1A and 1.5A Output Current): Parts with enhanced output current capability (1A or 1.5A) that maintain the same 3.3V fixed output, package form factor, and operating temperature range. These provide increased design margin and are suitable for applications requiring higher current delivery.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (100mA Applications):

LP2950CDTX-3.3/NOPB from Texas Instruments is the primary direct equivalent. It maintains identical electrical specifications to the obsolete LP2950CDTX-3.3 while offering active product status and ROHS3 compliance. This part is recommended for applications requiring no design modification.

The onsemi variants (LP2950CDT-3.3G, LP2950CDT-3.3RKG, LP2950ACDT-3.3RG) provide equivalent 100mA output current with improved voltage dropout characteristics (0.45V vs. 0.6V) and active product status with ROHS3 compliance. These are suitable direct replacements with enhanced performance margins.

For Higher Current Applications (1A and Above):

BA033CC0FP-E2 from Rohm Semiconductor delivers 1A output current in the same TO-252-3 package with active status and ROHS3 compliance. This part is suitable for applications requiring increased current capacity while maintaining the same form factor.

LD29150DT33R from STMicroelectronics provides 1.5A output current in TO-252-3 packaging with active status and ROHS3 compliance. Note that the maximum input voltage is reduced to 14V compared to the original 30V specification. This part is appropriate for applications with lower input voltage requirements and higher current demands.

All recommended substitutes maintain the required operating temperature range (-40°C ~ 125°C) and surface mount DPAK package compatibility.

Frequently Asked Questions (FAQ)

Q: Can LP2950CDTX-3.3/NOPB be used as a direct drop-in replacement for the obsolete LP2950CDTX-3.3?

A: Yes. LP2950CDTX-3.3/NOPB is electrically and mechanically identical to the obsolete part, with the primary differences being active product status and ROHS3 compliance. No design changes are required.

Q: What is the difference between the onsemi LP2950 variants (LP2950CDT-3.3G, LP2950CDT-3.3RKG, LP2950ACDT-3.3RG)?

A: All three onsemi variants deliver identical electrical performance: 100mA output current, 3.3V fixed output, and -40°C ~ 125°C operating range. The differences are in packaging format (Tube vs. Cut Tape & Digi-Reel) and tape configuration. Selection depends on procurement and assembly requirements.

Q: Can I use BA033CC0FP-E2 or LD29150DT33R in a 100mA application?

A: Yes. Both higher-current parts are backward compatible with 100mA applications. BA033CC0FP-E2 (1A) and LD29150DT33R (1.5A) will operate correctly at lower current levels. However, LD29150DT33R has a reduced maximum input voltage (14V vs. 30V), which may be a constraint in some designs.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitutes are ROHS3 compliant. The original LP2950CDTX-3.3 is marked as RoHS non-compliant, making the substitutes preferable for applications with RoHS requirements.

Q: Do all substitute parts use the same TO-252-3 package?

A: Yes. All substitute parts listed use the TO-252-3 (DPAK) surface mount package with identical pinout and footprint compatibility. No PCB layout modifications are required.

Q: What is the significance of the voltage dropout difference between LP2950CDTX-3.3 (0.6V) and the onsemi variants (0.45V)?

A: The lower dropout voltage in onsemi parts provides improved efficiency and allows operation with lower input voltages while maintaining stable 3.3V output. This is a performance advantage with no compatibility impact.

Q: Which substitute should I choose for new designs?

A: For new 100mA designs, LP2950CDTX-3.3/NOPB or any onsemi variant (LP2950CDT-3.3G, LP2950CDT-3.3RKG, LP2950ACDT-3.3RG) are recommended. For designs requiring higher current margin or future scalability, BA033CC0FP-E2 (1A) is suitable if input voltage remains above 25V. LD29150DT33R (1.5A) is appropriate only if input voltage is constrained to 14V or below.