LP2950-33LPE3 Equivalent & Substitute Parts

Part Overview

The LP2950-33LPE3 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3.3V output at 100mA in a TO-92-3 package. This device is classified as Last Time Buy, indicating discontinued production status. The part provides positive fixed output regulation with integrated over-current and over-temperature protection, suitable for low-power applications requiring stable 3.3V supply rails.

Due to Last Time Buy status, identifying functionally equivalent substitute parts is essential for design continuity and long-term supply chain planning. Equivalent alternatives maintain identical electrical specifications and package compatibility while offering active product status and 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
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

Substitute parts for the LP2950-33LPE3 are qualified based on the following criteria:

Output Voltage: Fixed 3.3V output (non-negotiable)
Output Current: 100mA minimum rating
Input Voltage Range: Maximum 30V or greater
Package: TO-92-3 or TO-226-3 equivalent
Mounting: Through-hole configuration
Protection: Over-current and over-temperature protection minimum
Operating Temperature: -40°C to 125°C range
Compliance: ROHS3 compliant, REACH unaffected

All substitute parts listed maintain these core electrical and mechanical parameters, ensuring direct functional replacement in existing designs without circuit modification.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage @ 100mA	Quiescent Current	Package	Product Status	Inventory
LP2950-33LPE3	Texas Instruments	3.3V	100mA	0.6V	120 µA	TO-92-3	Last Time Buy	2800 Pcs
LP2950-33LPRE3	Texas Instruments	3.3V	100mA	0.6V	120 µA	TO-92-3	Active	35300 Pcs
LP2950ACZ-3.3/NOPB	Texas Instruments	3.3V	100mA	0.6V	120 µA	TO-92-3	Active	7380 Pcs
LP2950CZ-3.3/NOPB	Texas Instruments	3.3V	100mA	0.6V	120 µA	TO-92-3	Active	6200 Pcs
LP2950ACZ-3.3G	onsemi	3.3V	100mA	0.45V	120 µA	TO-92-3	Active	3597 Pcs
LP2950CZ-3.3G	onsemi	3.3V	100mA	0.45V	120 µA	TO-92-3	Active	12800 Pcs

Engineering Selection Recommendations

Primary Recommendation: LP2950-33LPRE3

The LP2950-33LPRE3 from Texas Instruments is the direct functional equivalent with Active product status. This part maintains identical electrical specifications to the LP2950-33LPE3 while offering significantly higher inventory availability (35,300 units). The only difference is packaging format (Cut Tape vs. Bulk), which does not affect electrical performance or circuit compatibility.

Secondary Recommendations: LP2950ACZ-3.3/NOPB and LP2950CZ-3.3/NOPB

Both Texas Instruments parts provide Active status with identical electrical parameters. LP2950ACZ-3.3/NOPB is available in Bulk packaging (7,380 units), while LP2950CZ-3.3/NOPB is supplied in Tray format (6,200 units). Selection between these depends on procurement packaging requirements.

Alternative Manufacturer Option: LP2950ACZ-3.3G and LP2950CZ-3.3G (onsemi)

The onsemi-manufactured variants offer improved dropout voltage performance (0.45V vs. 0.6V @ 100mA) and lower supply current (12 mA vs. 14 mA maximum). These parts are functionally compatible and provide Active status with strong inventory levels. The onsemi LP2950CZ-3.3G offers the highest availability (12,800 units) among all substitutes.

All recommended parts maintain ROHS3 compliance, REACH unaffected status, and identical operating temperature ranges (-40°C to 125°C).

Frequently Asked Questions (FAQ)

Q: Can LP2950-33LPRE3 replace LP2950-33LPE3 directly in existing designs?

A: Yes. Both parts deliver identical electrical specifications: 3.3V fixed output, 100mA current rating, 0.6V dropout voltage at 100mA, and 120 µA quiescent current. The TO-92-3 package pinout is identical. No circuit modifications are required.

Q: What is the difference between LP2950-33LPE3 and LP2950-33LPRE3?

A: The primary difference is packaging format. LP2950-33LPE3 is supplied in Bulk, while LP2950-33LPRE3 is supplied in Cut Tape (CT). Electrical performance and pinout are identical. Product status differs: LP2950-33LPE3 is Last Time Buy, while LP2950-33LPRE3 is Active.

Q: Are onsemi LP2950 variants compatible with Texas Instruments versions?

A: Yes. The onsemi LP2950ACZ-3.3G and LP2950CZ-3.3G maintain identical pinout, package type (TO-92-3), and core electrical specifications. The onsemi versions offer improved dropout voltage (0.45V vs. 0.6V), which is a performance advantage. All protection features and operating temperature ranges match.

Q: Does packaging format (Bulk, Cut Tape, Tray) affect electrical performance?

A: No. Packaging format affects only procurement and handling logistics. Electrical specifications, performance, and reliability are identical across all packaging options for the same part number variant.

Q: Which substitute offers the best availability?

A: LP2950-33LPRE3 (Texas Instruments, Cut Tape) has the highest inventory at 35,300 units. For onsemi alternatives, LP2950CZ-3.3G offers 12,800 units in Bulk packaging.

Q: Can I mix different substitute parts in the same production run?

A: Yes. All listed substitutes are electrically and mechanically compatible. However, maintaining consistent part sourcing within a single production batch is recommended for traceability and quality control purposes.

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