LP2950ACZ-3.0RA Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2950ACZ-3.0RA is a linear voltage regulator IC from onsemi, classified as a Power Management (PMIC) component. It delivers a fixed positive 3V output at 100mA with a maximum dropout voltage of 0.45V at full load. The device is housed in a TO-92-3 (TO-226) through-hole package and operates across the industrial temperature range of -40°C to 125°C.

The LP2950ACZ-3.0RA is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for legacy systems.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the LP2950ACZ-3.0RA are classified based on the following substitution criteria:

Direct Manufacturer Substitute: LP2950ACZ-3.0RAG shares identical electrical specifications with the main part, including output voltage, current rating, dropout voltage, and operating temperature range. The primary difference is packaging format (Cut Tape vs. standard packaging) and product status (Active vs. Obsolete). This part is a direct functional replacement.

Parametric Equivalent: LP2950CZ-3.0RAG maintains all critical electrical parameters identical to the main part. The variant designation (CZ vs. ACZ) indicates a different temperature coefficient or manufacturing grade, but electrical performance remains equivalent. Product status is Active, making it suitable for new designs and ongoing production.

Similar Parts (Cross-Manufacturer): LP2950-30LP and LP2950-30LPR are Texas Instruments variants of the same LP2950 base product family. These parts share the same output voltage, current rating, operating temperature range, and package type. Minor differences exist in dropout voltage (0.6V vs. 0.45V) and supply current specifications, but these remain within acceptable tolerance for most applications requiring a 3V, 100mA linear regulator in TO-92-3 packaging.

Parameter Comparison

Parameter	LP2950ACZ-3.0RA (Main)	LP2950ACZ-3.0RAG	LP2950CZ-3.0RAG	LP2950-30LP	LP2950-30LPR
Manufacturer	onsemi	onsemi	onsemi	Texas Instruments	Texas Instruments
Output Voltage	3V	3V	3V	3V	3V
Output Current	100mA	100mA	100mA	100mA	100mA
Input Voltage (Max)	30V	30V	30V	30V	30V
Dropout Voltage (Max)	0.45V @ 100mA	0.45V @ 100mA	0.45V @ 100mA	0.6V @ 100mA	0.6V @ 100mA
Quiescent Current	120 µA	120 µA	120 µA	120 µA	120 µA
Supply Current (Max)	12 mA	12 mA	12 mA	14 mA	14 mA
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package Type	TO-92-3 (TO-226)	TO-92-3 (TO-226)	TO-92-3 (TO-226)	TO-92-3 (TO-226)	TO-92-3 (TO-226)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Last Time Buy	Last Time Buy
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Active Production and New Designs: LP2950ACZ-3.0RAG or LP2950CZ-3.0RAG are the preferred selections. Both are manufactured by onsemi with Active product status, ensuring long-term availability and supply chain stability. Both parts are ROHS3 compliant, meeting modern environmental and regulatory requirements. These parts are functionally identical to the obsolete main part and are available in Cut Tape packaging suitable for automated assembly.

For Legacy System Support: If the original design requires the exact onsemi part variant, LP2950ACZ-3.0RAG provides a direct replacement with identical electrical specifications and Active status. The transition from obsolete to Active status ensures continued manufacturing support.

For Cross-Manufacturer Flexibility: LP2950-30LP and LP2950-30LPR from Texas Instruments are viable alternatives when supply constraints exist for onsemi variants. Both maintain the same output voltage, current rating, operating temperature range, and TO-92-3 package. The slightly higher dropout voltage (0.6V vs. 0.45V) and supply current (14 mA vs. 12 mA) are acceptable for most applications. Both parts carry Last Time Buy status, indicating limited future availability.

Compliance Consideration: The original LP2950ACZ-3.0RA is RoHS non-compliant. All substitute parts listed are ROHS3 compliant, making them suitable for designs requiring environmental compliance certification.

Frequently Asked Questions (FAQ)

Q: Can LP2950ACZ-3.0RAG be used as a direct replacement for LP2950ACZ-3.0RA?

A: Yes. LP2950ACZ-3.0RAG is a direct functional equivalent with identical electrical specifications: 3V fixed output, 100mA current rating, 0.45V maximum dropout voltage, and TO-92-3 package. The primary difference is product status (Active vs. Obsolete) and packaging format (Cut Tape). Pin configuration and electrical performance are identical.

Q: What is the difference between LP2950ACZ-3.0RAG and LP2950CZ-3.0RAG?

A: Both parts are onsemi products with identical electrical specifications and Active status. The variant designation (ACZ vs. CZ) indicates different manufacturing grades or temperature coefficient classifications, but this does not affect functional performance for standard applications. Both are suitable replacements for the obsolete main part.

Q: Can Texas Instruments LP2950-30LP or LP2950-30LPR be used instead of the onsemi variants?

A: Yes, with minor performance differences. Both Texas Instruments parts maintain the same 3V output, 100mA current rating, operating temperature range, and TO-92-3 package. The dropout voltage is 0.6V (vs. 0.45V for onsemi variants) and supply current is 14 mA (vs. 12 mA). These differences are acceptable for most applications but should be verified against specific circuit requirements, particularly in low-input-voltage or high-efficiency designs.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the TO-92-3 (TO-226) through-hole package with identical pin configuration. Direct PCB replacement is possible without layout modifications. Packaging format differs (Cut Tape vs. Bulk), but this affects only procurement and handling, not electrical or mechanical compatibility.

Q: What is the impact of RoHS compliance differences?

A: The original LP2950ACZ-3.0RA is RoHS non-compliant, while all substitute parts are ROHS3 compliant. For new designs or systems requiring environmental compliance certification, ROHS3-compliant variants (LP2950ACZ-3.0RAG, LP2950CZ-3.0RAG, LP2950-30LP, LP2950-30LPR) are required. For legacy system repairs using existing inventory, RoHS compliance may not be a constraint.

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

A: LP2950ACZ-3.0RAG and LP2950CZ-3.0RAG from onsemi carry Active product status, indicating ongoing manufacturing and supply chain support. Texas Instruments variants (LP2950-30LP, LP2950-30LPR) are in Last Time Buy status, meaning production is ending and availability will diminish. For designs requiring extended production runs, onsemi variants are recommended.

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