LP2950CDT-3.3 Equivalent & Substitute Parts

Part Overview

The LP2950CDT-3.3 is a linear voltage regulator IC from onsemi, delivering a fixed positive 3.3V output at 100mA in a DPAK surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part provides over current and over temperature protection across an operating range of -40°C to 125°C, with a maximum input voltage of 30V and dropout voltage of 0.45V at full load.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	100mA
Input Voltage (Max)	30V
Dropout Voltage (Max)	0.45V @ 100mA
Quiescent Current	120 µA
Package Type	TO-252-3 DPAK
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature

Substitute Part Grouping Explanation

Substitution for the LP2950CDT-3.3 is determined by the following critical parameters: fixed 3.3V output voltage, TO-252-3 DPAK package compatibility, surface mount mounting type, and operating temperature range of -40°C to 125°C. Parts are grouped into three categories based on substitution relationship:

Direct Manufacturer Equivalent: Parts with identical electrical specifications and package type from the same or different manufacturers, suitable for direct replacement.

Parametric Equivalent: Parts with matching core electrical parameters (3.3V output, 100mA current rating, 30V maximum input) and identical package, differing only in product status or minor specifications.

Similar Functional Equivalent: Parts with higher output current capability (500mA to 1.5A) or different maximum input voltage, maintaining 3.3V output and TO-252-3 package compatibility but requiring application-level verification for current requirements.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Product Status	RoHS Status
LP2950CDT-3.3	onsemi	100mA	30V	0.45V @ 100mA	120 µA	Obsolete	Non-compliant
LP2950CDT-3.3G	onsemi	100mA	30V	0.45V @ 100mA	120 µA	Active	ROHS3 Compliant
LP2950CDT-3.3/NOPB	Texas Instruments	100mA	30V	0.6V @ 100mA	120 µA	Active	ROHS3 Compliant
SM72238TD-3.3/NOPB	Texas Instruments	100mA	30V	0.6V @ 100mA	140 µA	Active	ROHS3 Compliant
LP2950CDTX-3.3/NOPB	Texas Instruments	100mA	30V	0.6V @ 100mA	120 µA	Active	ROHS3 Compliant
BA033CC0FP-E2	Rohm Semiconductor	1A	25V	Not specified	2.5 mA	Active	ROHS3 Compliant
LD29150DT33R	STMicroelectronics	1.5A	14V	0.7V @ 1.5A	180 µA	Active	ROHS3 Compliant
LF33ABDT-TR	STMicroelectronics	500mA	16V	0.7V @ 500mA	1 mA	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (100mA Applications):

LP2950CDT-3.3G from onsemi is the primary direct equivalent, offering identical electrical specifications with active product status and ROHS3 compliance. This part eliminates obsolescence risk while maintaining full compatibility.

LP2950CDT-3.3/NOPB and LP2950CDTX-3.3/NOPB from Texas Instruments provide parametric equivalence with active status and ROHS3 compliance. Both support the full 30V input range and 100mA output current. The LP2950CDTX-3.3/NOPB variant includes short circuit protection in addition to over current and over temperature protection.

SM72238TD-3.3/NOPB from Texas Instruments (SolarMagic™ series) maintains electrical compatibility with slightly elevated quiescent current (140 µA versus 120 µA) and active product status with ROHS3 compliance.

For Higher Current Applications (500mA to 1.5A):

LF33ABDT-TR from STMicroelectronics delivers 500mA output current in the same TO-252-3 package with 16V maximum input voltage and active product status. This part is suitable for applications requiring higher current capacity within the 3.3V output specification.

LD29150DT33R from STMicroelectronics provides 1.5A output current in TO-252-3 DPAK packaging with 14V maximum input voltage. This part accommodates significantly higher load currents while maintaining the 3.3V output and package compatibility.

BA033CC0FP-E2 from Rohm Semiconductor offers 1A output current with 25V maximum input voltage in TO-252-3 packaging. This part includes over voltage protection in addition to over current and over temperature protection, with enhanced PSRR performance (55dB at 120Hz).

Compliance Considerations:

All recommended active substitutes comply with ROHS3 standards. The original LP2950CDT-3.3 is RoHS non-compliant; migration to compliant alternatives is recommended for new designs and long-term production continuity.

Frequently Asked Questions (FAQ)

Q: Can LP2950CDT-3.3G directly replace the obsolete LP2950CDT-3.3?

A: Yes. LP2950CDT-3.3G from onsemi provides identical electrical specifications (3.3V output, 100mA current, 30V maximum input, 0.45V dropout) and TO-252-3 DPAK package compatibility. The primary difference is active product status and ROHS3 compliance.

Q: What is the difference between LP2950CDT-3.3/NOPB and LP2950CDTX-3.3/NOPB?

A: Both are Texas Instruments parametric equivalents with 100mA output and 30V maximum input. LP2950CDTX-3.3/NOPB includes short circuit protection in its protection feature set, while LP2950CDT-3.3/NOPB provides over current and over temperature protection. Dropout voltage is 0.6V for both versus 0.45V for the original part.

Q: Can I use BA033CC0FP-E2 or LD29150DT33R as direct replacements?

A: These parts are functionally compatible for 3.3V output applications but deliver higher output current (1A and 1.5A respectively). They are suitable only if your application can tolerate the higher current capability. BA033CC0FP-E2 has a 25V maximum input; LD29150DT33R has a 14V maximum input, which may be limiting factors depending on your input voltage requirements.

Q: Are all substitute parts available in the same TO-252-3 DPAK package?

A: Yes. All listed substitute parts use TO-252-3 DPAK (2 Leads + Tab) surface mount packaging, ensuring PCB layout compatibility with the original LP2950CDT-3.3.

Q: Which substitute part has the best PSRR performance?

A: LF33ABDT-TR from STMicroelectronics provides the highest PSRR at 80dB to 65dB (120Hz). BA033CC0FP-E2 offers 55dB at 120Hz. The original LP2950CDT-3.3 and most Texas Instruments variants do not specify PSRR.

Q: What is the impact of higher quiescent current in SM72238TD-3.3/NOPB?

A: SM72238TD-3.3/NOPB has quiescent current of 140 µA versus 120 µA in the original part. This 20 µA difference is negligible in most applications but may impact battery-powered or ultra-low-power designs where every microamp matters.

Q: Can I use these parts interchangeably in production?

A: Direct parametric equivalents (LP2950CDT-3.3G, LP2950CDT-3.3/NOPB, LP2950CDTX-3.3/NOPB, SM72238TD-3.3/NOPB) are interchangeable for 100mA applications. Higher-current variants (BA033CC0FP-E2, LD29150DT33R, LF33ABDT-TR) require application verification to confirm current requirements do not exceed the original 100mA specification.

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