LP2950CZ-3.3 Equivalent & Substitute Parts

Part Overview

The LP2950CZ-3.3 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3.3V output at 100mA in a TO-92-3 package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer compatible functionality within defined parameter tolerances for power management applications.

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
Operating Temperature Range	-40°C ~ 125°C
Package Type	TO-92-3 (TO-226-3)
Mounting Type	Through Hole
Protection Features	Over Current, Over Temperature

Substitute Part Grouping Explanation

Substitution eligibility for the LP2950CZ-3.3 is determined by the following critical parameters:

Fixed output voltage of 3.3V
Output current capability of 100mA or greater
Maximum input voltage of 30V or greater
TO-92-3 package configuration for mechanical compatibility
Through-hole mounting type
Operating temperature range encompassing -40°C to 125°C
Over-current and over-temperature protection

Parts are grouped into two categories: direct equivalents (identical specifications and packaging) and functional substitutes (compatible electrical performance with minor parameter variations).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Voltage Dropout (Max)	Quiescent Current	Operating Temp Range	Product Status	RoHS Compliance
LP2950CZ-3.3	Texas Instruments	3.3V	100mA	0.6V @ 100mA	120 µA	-40°C ~ 125°C	Obsolete	Non-compliant
LP2950CZ-3.3/NOPB	Texas Instruments	3.3V	100mA	0.6V @ 100mA	120 µA	-40°C ~ 125°C	Active	ROHS3 Compliant
LP2950-33LPE3	Texas Instruments	3.3V	100mA	0.6V @ 100mA	120 µA	-40°C ~ 125°C	Last Time Buy	ROHS3 Compliant
LP2950ACZ-3.3G	onsemi	3.3V	100mA	0.45V @ 100mA	120 µA	-40°C ~ 125°C	Active	ROHS3 Compliant
LP2950CZ-3.3G	onsemi	3.3V	100mA	0.45V @ 100mA	120 µA	-40°C ~ 125°C	Active	ROHS3 Compliant
LT1121CZ-3.3#PBF	Analog Devices Inc.	3.3V	150mA	0.7V @ 150mA	50 µA	0°C ~ 125°C	Active	ROHS3 Compliant
LT1121IZ-3.3#PBF	Analog Devices Inc.	3.3V	150mA	0.7V @ 150mA	50 µA	-40°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Preferred for Replacement)

LP2950CZ-3.3/NOPB is the primary direct equivalent, maintaining identical electrical specifications while offering active product status and ROHS3 compliance. This part is recommended as the first choice for direct substitution in new designs and production continuity.

Texas Instruments LP2950 Series Alternatives

LP2950-33LPE3 provides equivalent electrical performance with Last Time Buy status, suitable for applications requiring extended supply availability. LP2950ACZ-3.3G and LP2950CZ-3.3G from onsemi are functionally equivalent with improved voltage dropout characteristics (0.45V vs. 0.6V), offering enhanced efficiency in power-constrained applications while maintaining active product status and full ROHS3 compliance.

Analog Devices LT1121 Series Alternatives

LT1121CZ-3.3#PBF and LT1121IZ-3.3#PBF are functional substitutes offering higher output current capability (150mA vs. 100mA) and lower quiescent current (50 µA vs. 120 µA). LT1121IZ-3.3#PBF extends the operating temperature range to -40°C, matching the original specification. These parts are suitable for applications requiring enhanced current delivery or reduced standby power consumption. Both maintain active product status and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can LP2950CZ-3.3/NOPB directly replace LP2950CZ-3.3?

A: Yes. LP2950CZ-3.3/NOPB is a direct equivalent with identical electrical and mechanical specifications. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). The "/NOPB" designation indicates lead-free, halogen-free packaging.

Q: What is the difference between onsemi LP2950 variants and Texas Instruments versions?

A: onsemi LP2950ACZ-3.3G and LP2950CZ-3.3G maintain identical output current and voltage specifications but feature improved voltage dropout (0.45V vs. 0.6V) and reduced supply current (12 mA vs. 14 mA). These improvements result in better efficiency and lower heat dissipation.

Q: Are LT1121 parts suitable substitutes despite higher output current?

A: Yes. LT1121CZ-3.3#PBF and LT1121IZ-3.3#PBF are compatible substitutes for applications requiring 100mA or less. The higher current rating (150mA) provides design margin without affecting performance at lower current levels. LT1121IZ-3.3#PBF is preferred when the full -40°C to 125°C temperature range is required.

Q: What are the package compatibility considerations?

A: All listed parts use TO-92-3 (TO-226-3) through-hole packages with identical pinout and mechanical dimensions. Direct board-level substitution is possible without layout modifications.

Q: Which part offers the best long-term availability?

A: LP2950CZ-3.3/NOPB and onsemi variants (LP2950ACZ-3.3G, LP2950CZ-3.3G) maintain active product status with the highest inventory levels, ensuring long-term supply continuity. LT1121 variants from Analog Devices also maintain active status.

Q: Does RoHS compliance affect electrical performance?

A: No. ROHS3 compliance affects material composition and manufacturing processes but does not alter electrical specifications or performance characteristics. All ROHS3-compliant variants maintain identical functional performance.

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