LP2950CDT-5.0 Equivalent & Substitute Parts

Part Overview

The LP2950CDT-5.0 is a linear voltage regulator IC from Texas Instruments, classified as a positive fixed output 5V regulator with 100mA output capacity in TO-252-3 (DPAK) surface mount packaging. This part is marked as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device provides regulated 5V output from input voltages up to 30V with integrated over-current and over-temperature protection, operating across the industrial temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LP2950CDT-5.0
Category	Power Management (PMIC)
Output Configuration	Positive Fixed
Output Voltage	5V
Output Current	100mA
Input Voltage (Max)	30V
Dropout Voltage	0.6V @ 100mA
Quiescent Current	120 µA
Package	TO-252-3 (DPAK)
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature
Product Status	Obsolete

Substitute Part Grouping Explanation

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

Output voltage: 5V fixed
Output current capability: minimum 100mA
Input voltage tolerance: up to 30V maximum
Package compatibility: TO-252-3 (DPAK) surface mount
Operating temperature range: -40°C to 125°C
Protection features: Over-current and over-temperature protection

Substitute parts are grouped into three categories based on functional equivalence:

Direct Equivalents maintain identical electrical specifications and package format, providing pin-for-pin replacement capability.

Parametric Equivalents meet or exceed the core electrical requirements (5V output, 100mA+ current, 30V input tolerance) but may have minor variations in quiescent current or dropout voltage within acceptable operating margins.

Higher-Capacity Alternatives provide increased output current (500mA to 1.5A) while maintaining 5V fixed output and TO-252-3 packaging, suitable for designs requiring additional current headroom.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Operating Temp	Product Status	RoHS Compliance
LP2950CDT-5.0	Texas Instruments	100mA	30V	0.6V @ 100mA	120 µA	-40°C to 125°C	Obsolete	Non-compliant
LP2950CDT-5.0/NOPB	National Semiconductor	100mA	30V	0.6V @ 100mA	120 µA	-40°C to 125°C	Active	Not specified
SM72238TD-5.0/NOPB	Texas Instruments	100mA	30V	0.6V @ 100mA	140 µA	-40°C to 125°C	Active	ROHS3 Compliant
BA05CC0FP-E2	Rohm Semiconductor	1A	25V	Not specified	2.5 mA	-40°C to 125°C	Active	ROHS3 Compliant
BA178M05FP-E2	Rohm Semiconductor	500mA	25V	2V @ 500mA (Typ)	4.5 mA	-40°C to 85°C	Active	ROHS3 Compliant
BA78M05FP-E2	Rohm Semiconductor	500mA	25V	2V @ 500mA (Typ)	6 mA	-40°C to 85°C	Active	ROHS3 Compliant
BA7805FP-E2	Rohm Semiconductor	1A	25V	2V @ 1A (Typ)	8 mA	-40°C to 85°C	Active	ROHS3 Compliant
BA17805FP-E2	Rohm Semiconductor	1A	25V	2V @ 1A (Typ)	4.5 mA	-40°C to 85°C	Active	ROHS3 Compliant
LD29150DT50R	STMicroelectronics	1.5A	14V	0.7V @ 1.5A	180 µA	-40°C to 125°C	Active	ROHS3 Compliant
LP2950ACDT-5RKG	onsemi	100mA	30V	0.45V @ 100mA	120 µA	-40°C to 125°C	Active	ROHS3 Compliant
LP2950CDT-5.0RKG	onsemi	100mA	30V	0.45V @ 100mA	120 µA	-40°C to 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Pin-for-Pin Replacement: LP2950CDT-5.0/NOPB (National Semiconductor) provides identical electrical specifications and is currently in active production status. LP2950ACDT-5RKG and LP2950CDT-5.0RKG (onsemi) offer the same functionality with improved RoHS3 compliance and slightly lower dropout voltage (0.45V vs 0.6V).

For RoHS3 Compliant Designs: SM72238TD-5.0/NOPB (Texas Instruments) maintains the original manufacturer lineage with full RoHS3 compliance and identical electrical performance. Quiescent current is marginally higher at 140 µA versus 120 µA, which is negligible in most applications.

For Designs Requiring Higher Current Capacity: BA178M05FP-E2 or BA78M05FP-E2 (Rohm Semiconductor) provide 500mA output current in the same TO-252-3 package. These are suitable when the 100mA specification is insufficient but the design footprint must remain unchanged. Note that input voltage tolerance reduces to 25V maximum.

For Maximum Current Capability: BA7805FP-E2 or BA17805FP-E2 (Rohm Semiconductor) deliver 1A output current, or LD29150DT50R (STMicroelectronics) provides 1.5A in the same package. These options require verification that the higher quiescent current and different dropout characteristics are acceptable for the application.

For Extended Input Voltage Range: The original LP2950CDT-5.0 specification of 30V input tolerance is maintained only by LP2950CDT-5.0/NOPB, LP2950ACDT-5RKG, and LP2950CDT-5.0RKG. Rohm and STMicroelectronics alternatives reduce maximum input voltage to 25V or 14V respectively.

Frequently Asked Questions (FAQ)

Q: Can I use BA05CC0FP-E2 as a direct replacement for LP2950CDT-5.0? A: BA05CC0FP-E2 is functionally compatible in TO-252-3 packaging and provides 5V fixed output with 1A capacity. However, it reduces maximum input voltage from 30V to 25V and increases quiescent current from 120 µA to 2.5 mA. Verify that your input voltage does not exceed 25V and that the higher quiescent current does not impact power budget before substitution.

Q: What is the difference between LP2950CDT-5.0/NOPB and LP2950ACDT-5RKG? A: Both are LP2950 series regulators with identical 100mA output and 5V fixed voltage. LP2950ACDT-5RKG offers improved RoHS3 compliance and lower dropout voltage (0.45V vs 0.6V). The /NOPB suffix indicates lead-free solder ball packaging from National Semiconductor, while the RKG suffix indicates onsemi's cut tape and digi-reel packaging. Both are pin-compatible and electrically interchangeable.

Q: Why do some substitutes have higher quiescent current? A: Quiescent current varies by design architecture and manufacturing process. Higher values (such as 8 mA in BA7805FP-E2 versus 120 µA in LP2950CDT-5.0) indicate different internal circuit topologies. For low-power standby applications, select parts with lower quiescent current. For standard applications, this difference is typically insignificant.

Q: Can I use LD29150DT50R if my input voltage is 30V? A: No. LD29150DT50R has a maximum input voltage rating of 14V. Using it with 30V input will exceed the device specification and cause failure. This part is suitable only for applications with input voltages up to 14V.

Q: Are all substitute parts RoHS3 compliant? A: No. The original LP2950CDT-5.0 is RoHS non-compliant. SM72238TD-5.0/NOPB, BA05CC0FP-E2, BA178M05FP-E2, BA78M05FP-E2, BA7805FP-E2, BA17805FP-E2, LD29150DT50R, LP2950ACDT-5RKG, and LP2950CDT-5.0RKG are all ROHS3 compliant. Select RoHS3 compliant parts for new designs or regulatory compliance requirements.

Q: What is the difference between TO-252-3 and DPAK packaging? A: TO-252-3 and DPAK (2 Leads + Tab) are equivalent designations for the same surface mount package format (SC-63). All substitute parts listed use this identical package, ensuring mechanical and thermal compatibility without PCB redesign.

Q: If I need more than 100mA, which substitute should I choose? A: For 500mA capacity, select BA178M05FP-E2 or BA78M05FP-E2. For 1A capacity, select BA7805FP-E2 or BA17805FP-E2. For 1.5A capacity, select LD29150DT50R. All maintain TO-252-3 packaging. Verify that input voltage requirements are met: Rohm parts support up to 25V, while LD29150DT50R supports only 14V maximum.

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