LP2950CZ-3.3RAG Equivalent & Substitute Parts

Part Overview

The LP2950CZ-3.3RAG is a linear voltage regulator IC manufactured by onsemi, delivering a fixed 3.3V output at 100mA in a TO-92-3 through-hole package. This device is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, output configuration, package type, and thermal operating range to ensure direct functional replacement in circuit applications.

Key Parameters

Parameter	LP2950CZ-3.3RAG
Manufacturer	onsemi
Output Voltage (Fixed)	3.3V
Output Current	100mA
Input Voltage (Max)	30V
Voltage Dropout (Max)	0.45V @ 100mA
Quiescent Current	120 µA
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-226-3, TO-92-3 Long Body (Formed Leads)
Mounting Type	Through Hole
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LP2950CZ-3.3RAG are classified into two categories based on parametric equivalence:

Parametric Equivalent (Same Manufacturer - onsemi): The LP2950ACZ-3.3RAG shares identical electrical specifications with the main part, including 3.3V fixed output, 100mA current rating, 0.45V dropout voltage, and -40°C to 125°C operating range. This part differs only in packaging designation and is a direct functional replacement.

Similar Parts (Cross-Manufacturer Substitutes): Parts from STMicroelectronics (L78L33 series) and Texas Instruments (LP2950 variants) meet the core substitution criteria: 3.3V fixed output, 100mA output current, 30V maximum input voltage, TO-92-3 package, through-hole mounting, and -40°C to 125°C operating temperature range. These parts are functionally equivalent for circuit applications requiring a 3.3V linear regulator in a TO-92-3 package.

Key parameters determining substitution eligibility:

Output voltage: 3.3V fixed
Output current: 100mA
Input voltage rating: 30V maximum
Package type: TO-92-3 (TO-226-3)
Mounting: Through hole
Operating temperature: -40°C to 125°C minimum

Parameter Comparison

Parameter	LP2950CZ-3.3RAG (onsemi)	LP2950ACZ-3.3RAG (onsemi)	L78L33ABZ-AP (STMicroelectronics)	L78L33ACZ (STMicroelectronics)	L78L33ACZ-AP (STMicroelectronics)	L78L33ACZTR (STMicroelectronics)	LP2950-33LPRE3 (Texas Instruments)	LP2950CZ-3.3/LFT3 (Texas Instruments)
Output Voltage	3.3V	3.3V	3.3V	3.3V	3.3V	3.3V	3.3V	3.3V
Output Current	100mA	100mA	100mA	100mA	100mA	100mA	100mA	100mA
Input Voltage (Max)	30V	30V	30V	30V	30V	30V	30V	30V
Voltage Dropout (Max)	0.45V @ 100mA	0.45V @ 100mA	Not specified	Not specified	Not specified	Not specified	0.6V @ 100mA	0.6V @ 100mA
Quiescent Current	120 µA	120 µA	5.5 mA	5.5 mA	5.5 mA	5.5 mA	120 µA	120 µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the LP2950CZ-3.3RAG. Selection between equivalent and substitute parts depends on application-specific requirements:

LP2950ACZ-3.3RAG (onsemi): Direct parametric equivalent with identical electrical characteristics and dropout voltage specification. Recommended for applications requiring exact performance matching within the onsemi LP2950 family.

L78L33 Series (STMicroelectronics): Cross-manufacturer alternatives offering enhanced protection features including short-circuit protection. The L78L33ABZ-AP and L78L33ACZ-AP variants maintain the full -40°C to 125°C operating range. L78L33ACZ and L78L33ACZTR operate from 0°C to 125°C, suitable for applications not requiring extended low-temperature performance. Quiescent current is higher (5.5 mA vs. 120 µA), affecting power consumption in standby conditions.

LP2950 Variants (Texas Instruments): LP2950-33LPRE3 and LP2950CZ-3.3/LFT3 provide equivalent performance with 0.6V dropout voltage specification and full -40°C to 125°C operating range. These parts are suitable for applications where Texas Instruments sourcing is preferred or required.

Frequently Asked Questions (FAQ)

Q: Can I substitute the LP2950CZ-3.3RAG with the LP2950ACZ-3.3RAG? A: Yes. The LP2950ACZ-3.3RAG is a parametric equivalent from the same manufacturer with identical electrical specifications, including 3.3V output, 100mA current, 0.45V dropout voltage, and -40°C to 125°C operating range. Pin configuration and package dimensions are identical.

Q: What is the difference between onsemi LP2950 and STMicroelectronics L78L33 regulators? A: Both deliver 3.3V at 100mA in TO-92-3 packages. Key differences include quiescent current (onsemi: 120 µA; STMicroelectronics: 5.5 mA) and protection features (STMicroelectronics L78L33 includes short-circuit protection). Operating temperature ranges vary: onsemi and Texas Instruments support -40°C to 125°C; most STMicroelectronics variants operate from 0°C to 125°C.

Q: Are all substitute parts pin-compatible with the LP2950CZ-3.3RAG? A: Yes. All listed parts use the TO-92-3 (TO-226-3) package with identical pin configuration for linear voltage regulators: input, ground, and output. Physical lead spacing and package dimensions are standardized across manufacturers.

Q: Which substitute part has the lowest quiescent current? A: The onsemi LP2950CZ-3.3RAG and LP2950ACZ-3.3RAG, along with Texas Instruments LP2950-33LPRE3 and LP2950CZ-3.3/LFT3, all specify 120 µA quiescent current. STMicroelectronics L78L33 series parts specify 5.5 mA, which is significantly higher and affects standby power consumption.

Q: Can I use L78L33ACZ in applications requiring -40°C operation? A: No. The L78L33ACZ operates from 0°C to 125°C. For applications requiring -40°C to 125°C operation, use L78L33ABZ-AP, L78L33ACZ-AP, L78L33ACZTR, or any onsemi/Texas Instruments LP2950 variant.

Q: What is the difference between cut tape and bulk packaging? A: Cut tape (CT) packaging provides individual components on adhesive tape for automated assembly. Bulk packaging contains loose components. Electrical performance is identical; packaging affects handling and assembly method only.

Q: Do all substitute parts include over-temperature protection? A: Yes. All listed parts include over-temperature and over-current protection. STMicroelectronics L78L33 series and Texas Instruments LP2950-33LPRE3 additionally include short-circuit protection.

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