LP2950CDT-5.0RK Equivalent & Substitute Parts

Part Overview

The LP2950CDT-5.0RK is a linear voltage regulator IC from onsemi, delivering a fixed 5V output at 100mA in a DPAK surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The LP2950 series provides micropower regulation with integrated over-current and over-temperature protection, suitable for low-power applications requiring stable 5V rails with minimal quiescent current.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	30V
Voltage Dropout (Max)	0.45V @ 100mA
Quiescent Current	120 µA
Operating Temperature Range	-40°C ~ 125°C
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Protection Features	Over Current, Over Temperature
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the LP2950CDT-5.0RK is determined by the following critical parameters:

Fixed 5V output voltage
100mA output current capability
Maximum 30V input voltage rating
TO-252-3 DPAK package compatibility
Operating temperature range -40°C to 125°C
Over-current and over-temperature protection

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents: Parts from onsemi with identical electrical specifications and active product status, providing direct replacement capability.

Parametric Equivalents: Parts from alternative manufacturers (National Semiconductor, Texas Instruments, Rohm Semiconductor) that meet the same electrical and thermal requirements within the specified parameter tolerances.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Product Status	RoHS Status
LP2950CDT-5.0RK	onsemi	5V	100mA	30V	0.45V @ 100mA	120 µA	TO-252-3 DPAK	Obsolete	RoHS non-compliant
LP2950CDT-5.0RKG	onsemi	5V	100mA	30V	0.45V @ 100mA	120 µA	TO-252-3 DPAK	Active	ROHS3 Compliant
LP2950ACDT-5RKG	onsemi	5V	100mA	30V	0.45V @ 100mA	120 µA	TO-252-3 DPAK	Active	ROHS3 Compliant
LP2950CDT-5.0/NOPB	National Semiconductor	5V	100mA	30V	0.6V @ 100mA	120 µA	TO-252-3 DPAK	Active	Not specified
LP2950CDTX-5.0/NOPB	National Semiconductor	5V	100mA	30V	0.6V @ 100mA	120 µA	TO-252-3 DPAK	Active	Not specified
SM72238TDE-5.0/NOPB	National Semiconductor	5V	100mA	30V	0.6V @ 100mA	140 µA	TO-252-3 DPAK	Active	Not specified
SM72238TDX-5.0/NOPB	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	140 µA	TO-252-3 DPAK	Active	ROHS3 Compliant
BA05CC0FP-E2	Rohm Semiconductor	5V	1A	25V	Not specified	2.5 mA	TO-252-3 DPAK	Active	ROHS3 Compliant

Engineering Selection Recommendations

Preferred Direct Replacement:

LP2950CDT-5.0RKG from onsemi is the primary substitute for the obsolete LP2950CDT-5.0RK. This part maintains identical electrical specifications, the same DPAK package, and achieves ROHS3 compliance. It is available in active production status with high inventory levels (17,800 units).

Alternative from onsemi:

LP2950ACDT-5RKG provides parametric equivalence with identical performance characteristics and ROHS3 compliance. This variant is suitable where the temperature coefficient or grade designation of the LP2950A series is acceptable.

Cross-Manufacturer Alternatives:

LP2950CDTX-5.0/NOPB (National Semiconductor) and SM72238TDX-5.0/NOPB (Texas Instruments) are parametric equivalents with active product status. These parts exhibit slightly higher dropout voltage (0.6V vs. 0.45V) and quiescent current (140 µA vs. 120 µA for SM72238 variants), which may impact thermal performance in power-limited applications.

Higher Current Alternative:

BA05CC0FP-E2 from Rohm Semiconductor provides 1A output current in the same TO-252-3 package. This part is suitable only for applications requiring higher current delivery and can tolerate the lower maximum input voltage (25V vs. 30V) and higher quiescent current (2.5 mA).

Frequently Asked Questions (FAQ)

Q: Can LP2950CDT-5.0RKG directly replace LP2950CDT-5.0RK?

A: Yes. LP2950CDT-5.0RKG is a direct replacement with identical electrical specifications, the same DPAK package, and active production status. The primary difference is ROHS3 compliance and improved availability.

Q: What is the difference between LP2950CDT-5.0RKG and LP2950ACDT-5RKG?

A: Both parts are onsemi products with identical electrical performance and ROHS3 compliance. The "A" designation in LP2950ACDT-5RKG indicates a different temperature coefficient or grade variant. Selection depends on specific application requirements for temperature stability.

Q: Can I use SM72238TDX-5.0/NOPB instead of the original part?

A: Yes, with design consideration. SM72238TDX-5.0/NOPB meets the core electrical requirements (5V, 100mA, TO-252-3 package) but exhibits 0.6V dropout voltage versus 0.45V for the original part. This 0.15V difference may affect thermal performance in applications with tight input voltage margins.

Q: Is BA05CC0FP-E2 a suitable substitute?

A: BA05CC0FP-E2 is a parametric alternative only for applications requiring higher output current (1A vs. 100mA). It is not a direct substitute due to lower maximum input voltage (25V vs. 30V) and significantly higher quiescent current (2.5 mA vs. 120 µA), which increases power dissipation.

Q: What packaging considerations apply to these substitutes?

A: All listed substitutes use the TO-252-3 DPAK package with identical pinout and thermal characteristics. PCB layout and thermal management remain unchanged during substitution.

Q: Which substitute offers the best compliance profile?

A: LP2950CDT-5.0RKG and SM72238TDX-5.0/NOPB both achieve ROHS3 compliance. LP2950CDT-5.0RKG is recommended as the primary choice due to onsemi manufacturer continuity and identical electrical specifications to the original part.

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