LP2950CDT-3.3 Equivalent & Substitute Parts

Part Overview

The LP2950CDT-3.3 is a linear voltage regulator IC manufactured by Texas Instruments, delivering a fixed 3.3V output at 100mA in a TO-252-3 (DPAK) surface mount package. This device is classified as Last Time Buy, indicating discontinued production. The regulator integrates over-current and over-temperature protection, operating across the industrial temperature range of -40°C to 125°C. Finding equivalent and substitute parts is necessary due to the Last Time Buy status and to evaluate alternative solutions with enhanced performance characteristics or improved availability.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	100mA
Input Voltage (Max)	30V
Voltage Dropout (Max)	0.6V @ 100mA
Quiescent Current	120 µA
Package	TO-252-3 (DPAK)
Protection Features	Over Current, Over Temperature
Operating Temperature	-40°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts are classified into three categories based on substitution criteria:

Direct Manufacturer Equivalent (Pin-Compatible, Identical Specifications)

LP2950CDT-3.3/NOPB: Identical electrical specifications and package. Differs only in product status (Active vs. Last Time Buy) and moisture sensitivity level (MSL 2 vs. MSL 1).

Manufacturer Recommended Substitutes (Enhanced Performance, Same Package)

BA033CC0FP-E2 (Rohm Semiconductor): Higher output current (1A vs. 100mA), lower input voltage maximum (25V vs. 30V), improved quiescent current (2.5mA vs. 120µA), and additional over-voltage protection.
LD29150DT33R (STMicroelectronics): Higher output current (1.5A vs. 100mA), lower input voltage maximum (14V vs. 30V), improved PSRR (67dB vs. not specified), and higher quiescent current (180µA vs. 120µA).
LP2950ACDT-3.3RG (onsemi): Identical output current (100mA), improved dropout voltage (0.45V vs. 0.6V), lower supply current (12mA vs. 14mA), different packaging (Tape & Reel vs. Tube).
LP2950CDT-3.3RKG (onsemi): Identical output current (100mA), improved dropout voltage (0.45V vs. 0.6V), lower supply current (12mA vs. 14mA), different packaging (Cut Tape vs. Tube).

Parametric Equivalents (Identical Electrical Performance, Different Packaging or Variants)

LP2950CDT-3.3G (onsemi): Identical electrical specifications to the main part, differs in manufacturer and packaging (Tube).
SM72238TD-3.3/NOPB (Texas Instruments): Identical electrical specifications, part of the SolarMagic™ series, slightly higher quiescent current (140µA vs. 120µA), different moisture sensitivity level (MSL 2 vs. MSL 1).

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Product Status	Package
LP2950CDT-3.3	Texas Instruments	100mA	30V	0.6V @ 100mA	120 µA	Last Time Buy	TO-252-3 (Tube)
LP2950CDT-3.3/NOPB	Texas Instruments	100mA	30V	0.6V @ 100mA	120 µA	Active	TO-252-3 (Tube)
BA033CC0FP-E2	Rohm Semiconductor	1A	25V	Not Specified	2.5 mA	Active	TO-252-3 (CT & Digi-Reel)
LD29150DT33R	STMicroelectronics	1.5A	14V	0.7V @ 1.5A	180 µA	Active	TO-252-3 (CT & Digi-Reel)
LP2950ACDT-3.3RG	onsemi	100mA	30V	0.45V @ 100mA	120 µA	Active	TO-252-3 (Tape & Reel)
LP2950CDT-3.3RKG	onsemi	100mA	30V	0.45V @ 100mA	120 µA	Active	TO-252-3 (CT & Digi-Reel)
LP2950CDT-3.3G	onsemi	100mA	30V	0.45V @ 100mA	120 µA	Active	TO-252-3 (Tube)
SM72238TD-3.3/NOPB	Texas Instruments	100mA	30V	0.6V @ 100mA	140 µA	Active	TO-252-3 (Tube)

Engineering Selection Recommendations

For Direct Replacement (Active Product Status Required) LP2950CDT-3.3/NOPB is the primary direct replacement, offering identical electrical specifications and Active product status. This part maintains full compatibility with existing designs and provides the longest supply continuity.

For Enhanced Current Capability BA033CC0FP-E2 and LD29150DT33R provide higher output current ratings (1A and 1.5A respectively) while maintaining the same 3.3V output and TO-252-3 package. These are suitable for designs requiring increased current delivery. Note that LD29150DT33R has a reduced maximum input voltage (14V vs. 30V), requiring verification against circuit input specifications.

For Improved Efficiency (Lower Dropout Voltage) LP2950ACDT-3.3RG and LP2950CDT-3.3RKG both feature improved dropout voltage (0.45V vs. 0.6V) at 100mA output, reducing power dissipation in battery-powered or low-headroom applications. Both maintain Active product status and identical output current specifications.

For Parametric Equivalence with Active Status LP2950CDT-3.3G and SM72238TD-3.3/NOPB provide parametric equivalence to the original part with Active product status. All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can LP2950CDT-3.3/NOPB be used as a direct drop-in replacement? A: Yes. LP2950CDT-3.3/NOPB is electrically and mechanically identical to LP2950CDT-3.3, with the same TO-252-3 package, 3.3V output, 100mA current rating, and protection features. The primary difference is Active product status versus Last Time Buy.

Q: What is the difference between the onsemi variants (LP2950ACDT-3.3RG, LP2950CDT-3.3RKG, LP2950CDT-3.3G)? A: All three onsemi parts share identical electrical specifications (100mA output, 0.45V dropout voltage, 30V maximum input). They differ in packaging format: LP2950ACDT-3.3RG is supplied on Tape & Reel, LP2950CDT-3.3RKG on Cut Tape & Digi-Reel, and LP2950CDT-3.3G on Tube. Select based on your procurement and assembly requirements.

Q: Can BA033CC0FP-E2 or LD29150DT33R be used if my circuit only requires 100mA? A: Yes. Both parts are rated for higher output currents (1A and 1.5A respectively) and will operate correctly at 100mA. However, verify that the reduced maximum input voltage (25V for BA033CC0FP-E2 and 14V for LD29150DT33R) is compatible with your circuit's input voltage range. The original LP2950CDT-3.3 supports up to 30V input.

Q: What does the dropout voltage specification mean for my application? A: Dropout voltage is the minimum difference between input and output voltage required for the regulator to maintain regulation. The original part specifies 0.6V @ 100mA. Lower dropout voltage (0.45V in onsemi variants) reduces power dissipation and allows operation with lower input voltages. Higher dropout voltage requires greater input-to-output voltage margin.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All parts listed, including the main part LP2950CDT-3.3 and all substitutes, are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: What is the significance of quiescent current differences? A: Quiescent current is the current drawn by the regulator itself when no load is connected. The original part draws 120µA. BA033CC0FP-E2 draws only 2.5mA (lower), while LD29150DT33R draws 180µA (higher). In battery-powered applications with minimal load, lower quiescent current reduces standby power consumption.

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