LP2950CDT-5.0RKG Equivalent & Substitute Parts

Part Overview

The LP2950CDT-5.0RKG is a linear voltage regulator IC manufactured by onsemi, delivering a fixed 5V output at 100mA in a surface-mount DPAK package. This active product is widely used in power management applications requiring low-dropout regulation with integrated over-current and over-temperature protection. Substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits alternative manufacturers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Maximum Input Voltage	30V
Maximum Dropout Voltage	0.45V @ 100mA
Quiescent Current	120 µA
Operating Temperature Range	-40°C to 125°C
Package Type	TO-252-3 DPAK
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following electrical and mechanical criteria:

Primary Substitution Criteria:

Fixed 5V output voltage
100mA output current capability
Maximum input voltage of 26V or higher
Operating temperature range of -40°C to 125°C
Surface-mount or through-hole package compatibility
Active product status
ROHS3 compliance

Grouping Logic:

Direct Substitutes (Same Package - TO-252-3 DPAK, Surface Mount): Parts meeting all electrical parameters with identical or superior specifications in the same package footprint.

Functional Equivalents (Different Package - TO-92-3, Through Hole): Parts with identical electrical performance but different mounting technology, suitable for applications where through-hole assembly is acceptable.

Parametric Equivalents (Same Package, Minor Specification Variance): Parts with marginally different quiescent current or dropout voltage but functionally equivalent within application tolerances.

Parameter Comparison

Part Number	Manufacturer	Package	Mounting	Input Voltage (Max)	Dropout (Max)	Iq (µA)	Supply Current (Max)	Protection	Status
LP2950CDT-5.0RKG	onsemi	TO-252-3 DPAK	Surface Mount	30V	0.45V @ 100mA	120 µA	12 mA	OC, OT	Active
LM2931ADT50R	STMicroelectronics	TO-252-3 DPAK	Surface Mount	26V	0.6V @ 100mA	1 mA	30 mA	CL, TS	Active
LP2950-50LPRE3	Texas Instruments	TO-92-3	Through Hole	30V	0.6V @ 100mA	120 µA	14 mA	OC, OT	Active
LP2950CDT-5.0/NOPB	National Semiconductor	TO-252-3 DPAK	Surface Mount	30V	0.6V @ 100mA	120 µA	14 mA	OC, OT	Active
LP2950CDTX-5.0/NOPB	National Semiconductor	TO-252-3 DPAK	Surface Mount	30V	0.6V @ 100mA	120 µA	14 mA	OC, OT, SC	Active
SM72238TDE-5.0/NOPB	National Semiconductor	TO-252-3 DPAK	Surface Mount	30V	0.6V @ 100mA	140 µA	14 mA	OC, OT	Active
SM72238TDX-5.0/NOPB	Texas Instruments	TO-252-3 DPAK	Surface Mount	30V	0.6V @ 100mA	140 µA	14 mA	OC, OT	Active

Engineering Selection Recommendations

Direct Substitutes (Recommended for PCB-level compatibility):

LM2931ADT50R, LP2950CDT-5.0/NOPB, LP2950CDTX-5.0/NOPB, SM72238TDE-5.0/NOPB, and SM72238TDX-5.0/NOPB are all active products with ROHS3 compliance and identical package footprints. These parts maintain the same TO-252-3 DPAK pinout and can be used as direct PCB substitutes. The LM2931ADT50R exhibits lower quiescent current (1 mA vs. 120 µA) and higher supply current specification, making it suitable for applications where standby power consumption is critical. The LP2950CDTX-5.0/NOPB includes short-circuit protection in addition to over-current and over-temperature protection.

Functional Equivalent (For through-hole assembly):

LP2950-50LPRE3 from Texas Instruments provides identical electrical performance with the same 30V input rating and 120 µA quiescent current. This part is packaged in TO-92-3 through-hole format, suitable only for applications using through-hole assembly technology. It maintains ROHS3 compliance and active product status.

Compliance & Certification:

All substitute parts listed are active products with ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement.

Frequently Asked Questions (FAQ)

Q: Can LM2931ADT50R replace LP2950CDT-5.0RKG directly on the PCB?

A: Yes. Both parts use the TO-252-3 DPAK package with identical pinout. The LM2931ADT50R has a lower maximum input voltage (26V vs. 30V) and higher quiescent current specification (1 mA vs. 120 µA), but delivers the same 5V, 100mA output. Verify your application's input voltage does not exceed 26V before substitution.

Q: What is the difference between LP2950CDT-5.0/NOPB and LP2950CDTX-5.0/NOPB?

A: Both are National Semiconductor LP2950 variants in TO-252-3 DPAK packages with identical electrical specifications. The LP2950CDTX-5.0/NOPB includes short-circuit protection in addition to over-current and over-temperature protection. Select based on application requirements for enhanced protection.

Q: Can I use LP2950-50LPRE3 as a substitute?

A: LP2950-50LPRE3 is a through-hole TO-92-3 package variant, not a direct PCB substitute for the surface-mount DPAK version. Use this part only if your design uses through-hole assembly technology. Electrical performance is equivalent.

Q: What does the quiescent current difference mean for my application?

A: Quiescent current is the regulator's internal consumption when supplying no load current. The main part draws 120 µA; LM2931ADT50R draws 1 mA. In battery-powered or low-power standby applications, the lower quiescent current of the main part is preferable. For general-purpose applications, this difference is negligible.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component procurement.

Q: What is the significance of the dropout voltage specification?

A: Dropout voltage is the minimum voltage difference between input and output at which the regulator maintains regulation. The main part specifies 0.45V @ 100mA; most substitutes specify 0.6V @ 100mA. For applications with tight input voltage margins, the lower dropout of the main part may be preferable. Verify your input voltage headroom before substitution.

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