LP2950CZ-5.0RAG Equivalent & Substitute Parts

Part Overview

The LP2950CZ-5.0RAG is a linear voltage regulator IC manufactured by onsemi, delivering a fixed 5V positive output at 100mA in a TO-92 (TO-226) through-hole package. This device is classified as an active product and is ROHS3 compliant. Finding equivalent and substitute parts is necessary when the primary part number becomes unavailable, when alternative sourcing is required for supply chain optimization, or when design flexibility across manufacturers is needed while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	5V
Voltage - Input (Max)	30V
Current - Output	100mA
Voltage Dropout (Max)	0.45V @ 100mA
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

Substitution eligibility for the LP2950CZ-5.0RAG is determined by the following critical parameters:

Fixed 5V output voltage
100mA output current capability
TO-92-3 package configuration with through-hole mounting
Maximum input voltage of 26V to 30V
Operating temperature range of -40°C to 125°C
ROHS3 compliance and active product status

Parts are grouped into two categories: parametric equivalents from the same manufacturer (onsemi) and direct/similar substitutes from alternative manufacturers (STMicroelectronics and Texas Instruments). All listed substitutes maintain the core electrical specifications and package compatibility required for direct board-level replacement.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 100mA	Quiescent Current	Package	Operating Temp	Protection Features	Product Status
LP2950CZ-5.0RAG	onsemi	5V	100mA	30V	0.45V	120 µA	TO-92-3	-40°C ~ 125°C	Over Current, Over Temperature	Active
LP2950CZ-5.0RPG	onsemi	5V	100mA	30V	0.45V	120 µA	TO-92-3	-40°C ~ 125°C	Over Current, Over Temperature	Active
LM2931AZ50R	STMicroelectronics	5V	100mA	26V	0.6V	1 mA	TO-92-3	-40°C ~ 125°C	Current Limit, Thermal Shutdown	Active
L78L05ABZ-AP	STMicroelectronics	5V	100mA	30V	Not Specified	5.5 mA	TO-92-3	-40°C ~ 125°C	Over Current, Over Temperature, Short Circuit	Active
L78L05ABZ-TR	STMicroelectronics	5V	100mA	30V	Not Specified	5.5 mA	TO-92-3	-40°C ~ 125°C	Over Current, Over Temperature, Short Circuit	Active
LP2950-50LPRE3	Texas Instruments	5V	100mA	30V	0.6V	120 µA	TO-92-3	-40°C ~ 125°C	Over Current, Over Temperature	Active
LP2950CZ-5.0/LFT1	Texas Instruments	5V	100mA	30V	0.6V	120 µA	TO-92-3	-40°C ~ 125°C	Over Current, Over Temperature, Short Circuit	Active
LP2950CZ-5.0/LFT3	Texas Instruments	5V	100mA	30V	0.6V	120 µA	TO-92-3	-40°C ~ 125°C	Over Current, Over Temperature	Active
LP2950CZ-5.0/LFT7	Texas Instruments	5V	100mA	30V	0.6V	120 µA	TO-92-3	-40°C ~ 125°C	Over Current, Over Temperature, Short Circuit	Active

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance, meeting regulatory requirements equivalent to the LP2950CZ-5.0RAG. Selection among substitutes should be based on:

Parametric Equivalents (onsemi): LP2950CZ-5.0RPG provides identical electrical specifications and dropout voltage performance to the primary part, differing only in internal device packaging designation. This represents the closest direct equivalent.

Direct Substitutes (Texas Instruments LP2950 Series): LP2950-50LPRE3, LP2950CZ-5.0/LFT1, LP2950CZ-5.0/LFT3, and LP2950CZ-5.0/LFT7 maintain the same base product architecture with 0.6V dropout voltage at 100mA and identical quiescent current specifications. These are suitable for applications where the slightly higher dropout voltage is acceptable.

Alternative Architecture (STMicroelectronics): LM2931AZ50R and L78L05ABZ variants (L78L05ABZ-AP, L78L05ABZ-TR) employ different internal topologies. The LM2931AZ50R operates with significantly lower quiescent current (1mA) and reduced maximum input voltage (26V). The L78L05ABZ series provides enhanced protection features including short-circuit protection but operates with higher quiescent current (5.5mA). These alternatives are suitable when supply chain constraints require cross-architecture substitution.

Frequently Asked Questions (FAQ)

Q: Can LP2950CZ-5.0RPG be used as a direct replacement for LP2950CZ-5.0RAG?

A: Yes. Both parts are manufactured by onsemi with identical electrical specifications, output voltage, current rating, dropout voltage, and operating temperature range. The difference is in internal device packaging designation only.

Q: What is the key difference between the onsemi LP2950 and Texas Instruments LP2950 variants?

A: Both maintain the same 5V output and 100mA current capability. The Texas Instruments versions (LP2950-50LPRE3, LP2950CZ-5.0/LFT1, LP2950CZ-5.0/LFT3, LP2950CZ-5.0/LFT7) specify a 0.6V dropout voltage at 100mA compared to 0.45V for the onsemi part. This 0.15V difference may impact applications with tight input voltage margins.

Q: Are the STMicroelectronics L78L05ABZ parts compatible with the LP2950CZ-5.0RAG?

A: Yes, mechanically and electrically. Both deliver 5V at 100mA in TO-92-3 packages. However, the L78L05ABZ series draws higher quiescent current (5.5mA versus 120µA), which may increase power consumption in battery-powered applications. The L78L05ABZ provides additional short-circuit protection.

Q: Why does the LM2931AZ50R specify a lower maximum input voltage (26V versus 30V)?

A: The LM2931AZ50R is a different regulator architecture with different internal design specifications. Applications requiring the full 30V input range should use LP2950 variants or L78L05ABZ parts instead.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting the same environmental and regulatory standards as the LP2950CZ-5.0RAG.

Q: Can I use these parts interchangeably on the same PCB?

A: Yes, all parts share identical TO-92-3 package geometry and through-hole pin configuration. No PCB layout modifications are required for substitution. However, circuit performance may vary slightly due to differences in dropout voltage and quiescent current specifications.

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