LP2950ACZ-3.3RAG Equivalent & Substitute Parts

Part Overview

The LP2950ACZ-3.3RAG is a linear voltage regulator IC manufactured by onsemi, delivering a fixed positive 3.3V output at 100mA in a TO-92-3 package. This device is classified as active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance, output configuration, and mechanical compatibility are maintained across the specified parameter range. Alternative models may be required due to inventory availability, packaging preferences, or supply chain considerations.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	100mA
Input Voltage (Max)	30V
Voltage Dropout (Max)	0.45V @ 100mA
Quiescent Current (Iq)	120 µA
Operating Temperature Range	-40°C ~ 125°C
Package / Case	TO-226-3, TO-92-3
Mounting Type	Through Hole
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LP2950ACZ-3.3RAG is determined by the following criteria:

Fixed output voltage of 3.3V
Output current rating of 100mA minimum
Maximum input voltage of 30V or greater
TO-92-3 package compatibility (TO-226-3 equivalent)
Through-hole mounting configuration
Active product status
ROHS3 compliance

Parts are classified as direct or similar substitutes based on adherence to these parameters. Direct substitutes maintain identical electrical specifications and packaging. Similar substitutes meet core electrical requirements and package compatibility but may exhibit variations in secondary parameters such as quiescent current, dropout voltage, or protection feature sets.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current (Iq)	Operating Temperature	Package	Packaging Type
LP2950ACZ-3.3RAG	onsemi	3.3V	100mA	30V	0.45V @ 100mA	120 µA	-40°C ~ 125°C	TO-92-3	Cut Tape (CT)
LP2950ACZ-3.3/NOPB	Texas Instruments	3.3V	100mA	30V	0.6V @ 100mA	120 µA	-40°C ~ 125°C	TO-92-3	Bulk
L78L33ABZ-AP	STMicroelectronics	3.3V	100mA	30V	Not Specified	5.5 mA	-40°C ~ 125°C	TO-92-3	Cut Tape (CT)
L78L33ACZ	STMicroelectronics	3.3V	100mA	30V	Not Specified	5.5 mA	0°C ~ 125°C	TO-92-3	Bulk
L78L33ACZ-AP	STMicroelectronics	3.3V	100mA	30V	Not Specified	5.5 mA	0°C ~ 125°C	TO-92-3	Cut Tape (CT)
L78L33ACZTR	STMicroelectronics	3.3V	100mA	30V	Not Specified	5.5 mA	0°C ~ 125°C	TO-92-3	Cut Tape (CT)
LP2950-33LPRE3	Texas Instruments	3.3V	100mA	30V	0.6V @ 100mA	120 µA	-40°C ~ 125°C	TO-92-3	Cut Tape (CT)
LP2950CZ-3.3/LFT3	Texas Instruments	3.3V	100mA	30V	0.6V @ 100mA	120 µA	-40°C ~ 125°C	TO-92-3	Cut Tape (CT)

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance, meeting baseline regulatory and supply chain requirements.

Texas Instruments LP2950 variants (LP2950ACZ-3.3/NOPB, LP2950-33LPRE3, LP2950CZ-3.3/LFT3) preserve the quiescent current specification of 120 µA and operating temperature range of -40°C to 125°C. These parts differ from the primary part only in dropout voltage (0.6V versus 0.45V) and packaging format (bulk or cut tape).

STMicroelectronics L78L33 variants (L78L33ABZ-AP, L78L33ACZ, L78L33ACZ-AP, L78L33ACZTR) deliver lower quiescent current at 5.5 mA and include short-circuit protection in addition to over-current and over-temperature protection. Operating temperature ranges vary between 0°C to 125°C and -40°C to 125°C. Dropout voltage specifications are not provided for these parts.

Selection should prioritize parts matching the required operating temperature range and dropout voltage performance for the target application.

Frequently Asked Questions (FAQ)

Q: Can L78L33 series parts directly replace the LP2950ACZ-3.3RAG?

A: L78L33 variants meet the core electrical requirements of 3.3V output at 100mA in TO-92-3 packaging. However, they differ in quiescent current (5.5 mA versus 120 µA) and operating temperature range (0°C to 125°C for some variants versus -40°C to 125°C). Applications requiring the full -40°C to 125°C range or lower quiescent current performance should use Texas Instruments LP2950 variants instead.

Q: What is the significance of dropout voltage differences?

A: Dropout voltage determines the minimum input-to-output voltage differential required for proper regulation. The LP2950ACZ-3.3RAG specifies 0.45V dropout at 100mA, while Texas Instruments LP2950 substitutes specify 0.6V. Applications with tight input voltage margins may require the lower dropout specification of the primary part.

Q: Are packaging format differences (bulk versus cut tape) electrically significant?

A: No. Bulk and cut tape packaging formats are supply and handling variations only. Electrical performance and component specifications remain identical. Selection between formats depends on assembly process requirements and inventory management.

Q: Do all substitute parts include short-circuit protection?

A: No. The primary part specifies over-current and over-temperature protection. STMicroelectronics L78L33 variants add short-circuit protection. Texas Instruments LP2950 variants maintain the same protection feature set as the primary part. Application requirements should determine whether additional short-circuit protection is necessary.

Q: Is the TO-92-3 package compatible across all listed parts?

A: Yes. All substitute parts use TO-226-3 or TO-92-3 packaging, which are mechanically and electrically equivalent for through-hole mounting applications. Pin configuration and lead spacing are identical.

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