LP2950ACN-L-3-3 Equivalent & Substitute Parts

Part Overview

The LP2950ACN-L-3-3 is a linear voltage regulator IC from MaxLinear, Inc., designed to deliver a fixed 3.3V output at 100mA in a TO-92-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across an input voltage range up to 30V with a maximum dropout voltage of 0.45V at full load, suitable for low-power applications requiring stable 3.3V regulation.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	100mA
Input Voltage (Max)	30V
Dropout Voltage (Max)	0.45V @ 100mA
Quiescent Current	170 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 for the LP2950ACN-L-3-3 is determined by the following critical parameters:

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

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Equivalents: Parts with identical electrical specifications and package configuration from alternative manufacturers.

Manufacturer Recommended Substitutes: Parts with enhanced or equivalent performance characteristics, recommended by original manufacturers for direct replacement.

Parametric Equivalents: Parts meeting all critical electrical and mechanical requirements with minor specification variations that do not affect functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage (Max)	Quiescent Current	Operating Temp Range	Product Status	Package
LP2950ACN-L-3-3	MaxLinear, Inc.	3.3V	100mA	0.45V @ 100mA	170 µA	-40°C ~ 125°C	Obsolete	TO-92-3
LP2950-33LPE3	Texas Instruments	3.3V	100mA	0.6V @ 100mA	120 µA	-40°C ~ 125°C	Last Time Buy	TO-92-3
LP2950ACZ-3.3G	onsemi	3.3V	100mA	0.45V @ 100mA	120 µA	-40°C ~ 125°C	Active	TO-92-3
L78L33ACZ	STMicroelectronics	3.3V	100mA	Not Specified	5.5 mA	0°C ~ 125°C	Active	TO-92-3
LP2950CZ-3.3/LFT3	Texas Instruments	3.3V	100mA	0.6V @ 100mA	120 µA	-40°C ~ 125°C	Active	TO-92-3
LP2950CZ-3.3/NOPB	Texas Instruments	3.3V	100mA	0.6V @ 100mA	120 µA	-40°C ~ 125°C	Active	TO-92-3
LP2950CZ-3.3G	onsemi	3.3V	100mA	0.45V @ 100mA	120 µA	-40°C ~ 125°C	Active	TO-92-3
LT1121CZ-3.3#PBF	Analog Devices Inc.	3.3V	150mA	0.7V @ 150mA	50 µA	0°C ~ 125°C	Active	TO-92-3
LT1121IZ-3.3#PBF	Analog Devices Inc.	3.3V	150mA	0.7V @ 150mA	50 µA	-40°C ~ 125°C	Active	TO-92-3
LP2950ACZ-3.3/NOPB	Texas Instruments	3.3V	100mA	0.6V @ 100mA	120 µA	-40°C ~ 125°C	Active	TO-92-3

Engineering Selection Recommendations

For Active Production: LP2950ACZ-3.3G (onsemi) and LP2950CZ-3.3G (onsemi) are preferred substitutes. Both are active products with ROHS3 compliance and REACH unaffected status. These parts maintain the 0.45V dropout voltage specification of the original part while offering improved quiescent current performance at 120 µA.

For Texas Instruments Ecosystem: LP2950CZ-3.3/NOPB and LP2950CZ-3.3/LFT3 provide direct functional equivalence with active product status and full compliance certifications. The 0.6V dropout voltage represents a minor specification increase but remains within acceptable operating margins for most applications.

For Extended Temperature Range: LT1121IZ-3.3#PBF from Analog Devices Inc. maintains the full -40°C to 125°C operating range while offering 150mA output current capability. This part includes an enable control feature and reverse polarity protection, providing enhanced functionality over the original part.

For Cost-Sensitive Applications: L78L33ACZ from STMicroelectronics is an active product with ROHS3 compliance. Note that the operating temperature range is limited to 0°C to 125°C, which excludes the lower temperature extreme of the original specification.

Avoid: LP2950-33LPE3 is classified as Last Time Buy, indicating limited future availability despite current inventory levels.

Frequently Asked Questions (FAQ)

Q: Can I use LT1121CZ-3.3#PBF as a direct replacement for LP2950ACN-L-3-3?

A: LT1121CZ-3.3#PBF is functionally compatible for applications requiring 100mA or less output current. The part offers 150mA capability, lower quiescent current (50 µA vs. 170 µA), and enhanced protection features including reverse polarity protection. However, the operating temperature range is limited to 0°C to 125°C. For applications requiring the full -40°C to 125°C range, use LT1121IZ-3.3#PBF instead.

Q: What is the difference between LP2950ACZ-3.3G and LP2950CZ-3.3G?

A: Both parts are from onsemi with identical electrical specifications: 3.3V output, 100mA current, 0.45V dropout voltage, and -40°C to 125°C operating range. The primary difference is the package designation suffix (ACZ vs. CZ), which reflects internal die or manufacturing process variations. Both are suitable for direct substitution.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are RoHS3 compliant except the original LP2950ACN-L-3-3, which does not specify RoHS status. All active substitute parts carry ROHS3 Compliant certification and REACH Unaffected status.

Q: Can I use a substitute part with higher output current rating?

A: Yes. Parts rated for 150mA output current (LT1121CZ-3.3#PBF and LT1121IZ-3.3#PBF) are backward compatible with applications designed for 100mA. The higher current rating provides design margin and does not affect operation at lower current levels.

Q: What is the significance of the dropout voltage difference between 0.45V and 0.6V?

A: Dropout voltage determines the minimum input-to-output voltage differential required for regulation. A 0.45V dropout (onsemi parts) requires less input voltage headroom than 0.6V (Texas Instruments parts). For applications with tight input voltage margins, the lower dropout voltage is preferable. For most standard applications, both specifications are acceptable.

Q: Are all substitute parts available in the same TO-92-3 package?

A: Yes. All substitute parts use the TO-92-3 (TO-226-3) package configuration, ensuring mechanical and thermal compatibility with the original part. Through-hole mounting type is consistent across all parts.

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