LP2950CDTX-5.0 Equivalent & Substitute Parts

Part Overview

The LP2950CDTX-5.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 100mA in a TO-252-3 (DPAK) surface mount package. This device is classified as "Not For New Designs," indicating it has reached end-of-life status. The regulator features integrated protection against overcurrent, overtemperature, and short circuit conditions, with a maximum input voltage of 30V and dropout voltage of 0.6V at 100mA. Finding equivalent and substitute parts is necessary due to the product's discontinued status and limited inventory availability for new production requirements.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	30V
Dropout Voltage	0.6V @ 100mA
Quiescent Current	120 µA
Operating Temperature	-40°C ~ 125°C
Package	TO-252-3 (DPAK)
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution for the LP2950CDTX-5.0 is determined by the following critical parameters:

Output voltage fixed at 5V
Package compatibility: TO-252-3 (DPAK, 2 Leads + Tab, SC-63)
Surface mount mounting type
Operating temperature range: -40°C ~ 125°C
Protection features: Over Current, Over Temperature, Short Circuit

Substitute parts are grouped into two categories:

Direct Equivalents (100mA Output Current): Parts with identical 100mA output current rating, matching the original specification exactly. These include LP2950CDTX-5.0/NOPB (National Semiconductor), LP2950ACDT-5.0G (onsemi), LP2950ACDT-5RKG (onsemi), and LP2950CDT-5.0G (onsemi). All maintain the same quiescent current of 120 µA and dropout voltage characteristics.

Higher Current Alternatives (500mA to 1.5A Output Current): Parts with increased output current capability while maintaining 5V fixed output, TO-252-3 package, and surface mount configuration. These include BA178M05FP-E2 (500mA), BA78M05FP-E2 (500mA), BA05CC0FP-E2 (1A), BA17805FP-E2 (1A), BA7805FP-E2 (1A), and LD29150DT50R (1.5A). These parts provide design flexibility for applications requiring higher current delivery while maintaining pin-compatible packaging.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Operating Temp	Product Status	RoHS Status
LP2950CDTX-5.0	Texas Instruments	100mA	30V	0.6V @ 100mA	120 µA	-40°C ~ 125°C	Not For New Designs	Non-compliant
LP2950CDTX-5.0/NOPB	National Semiconductor	100mA	30V	0.6V @ 100mA	120 µA	-40°C ~ 125°C	Active	Not specified
LP2950ACDT-5.0G	onsemi	100mA	30V	0.45V @ 100mA	120 µA	-40°C ~ 125°C	Active	ROHS3 Compliant
LP2950ACDT-5RKG	onsemi	100mA	30V	0.45V @ 100mA	120 µA	-40°C ~ 125°C	Active	ROHS3 Compliant
LP2950CDT-5.0G	onsemi	100mA	30V	0.45V @ 100mA	120 µA	-40°C ~ 125°C	Active	ROHS3 Compliant
BA178M05FP-E2	Rohm Semiconductor	500mA	25V	2V @ 500mA (Typ)	4.5 mA	-40°C ~ 85°C	Active	ROHS3 Compliant
BA78M05FP-E2	Rohm Semiconductor	500mA	25V	2V @ 500mA (Typ)	6 mA	-40°C ~ 85°C	Active	ROHS3 Compliant
BA05CC0FP-E2	Rohm Semiconductor	1A	25V	Not specified	2.5 mA	-40°C ~ 125°C	Active	ROHS3 Compliant
BA17805FP-E2	Rohm Semiconductor	1A	25V	2V @ 1A (Typ)	4.5 mA	-40°C ~ 85°C	Active	ROHS3 Compliant
BA7805FP-E2	Rohm Semiconductor	1A	25V	2V @ 1A (Typ)	8 mA	-40°C ~ 85°C	Active	ROHS3 Compliant
LD29150DT50R	STMicroelectronics	1.5A	14V	0.7V @ 1.5A	180 µA	-40°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (100mA Applications):

The onsemi LP2950 variants (LP2950ACDT-5.0G, LP2950ACDT-5RKG, LP2950CDT-5.0G) are the primary recommended substitutes. All three are in Active product status with ROHS3 compliance, providing long-term availability and regulatory alignment. These parts maintain identical electrical specifications to the original LP2950CDTX-5.0, including 100mA output current, 120 µA quiescent current, and -40°C to 125°C operating temperature range. The onsemi variants offer improved dropout voltage (0.45V vs. 0.6V), reducing power dissipation in the regulator. LP2950CDTX-5.0/NOPB from National Semiconductor is also electrically equivalent but lacks specified RoHS compliance status.

For Higher Current Applications (500mA to 1.5A):

When application requirements permit increased output current, Rohm Semiconductor BA series regulators (BA178M05FP-E2, BA78M05FP-E2, BA05CC0FP-E2, BA17805FP-E2, BA7805FP-E2) provide 500mA to 1A capability in the same TO-252-3 package. All are Active status with ROHS3 compliance. These parts maintain 5V fixed output and surface mount compatibility. Note that Rohm parts specify maximum input voltage of 25V (versus 30V for LP2950), which is acceptable for most 5V regulator applications. Operating temperature for Rohm BA series is -40°C to 85°C, which is narrower than the original -40°C to 125°C specification.

For Extended Temperature Range (Up to 125°C):

The STMicroelectronics LD29150DT50R maintains the full -40°C to 125°C operating range while providing 1.5A output current. This part is suitable for applications requiring both higher current and extended temperature operation. Maximum input voltage is limited to 14V, which restricts its use to lower voltage input applications compared to the original 30V specification.

Frequently Asked Questions (FAQ)

Q: Can I use a higher current rated part (500mA or 1A) as a direct replacement for the 100mA LP2950CDTX-5.0?

A: Yes, from an electrical and mechanical standpoint. Higher current rated regulators are backward compatible with lower current applications. The TO-252-3 package pinout remains identical, and 5V fixed output is maintained. However, verify that your PCB layout and thermal management are appropriate for the substitute part's quiescent current and power dissipation characteristics.

Q: What is the difference between the onsemi LP2950 variants (LP2950ACDT-5.0G, LP2950ACDT-5RKG, LP2950CDT-5.0G)?

A: All three onsemi variants are electrically identical with 100mA output current, 120 µA quiescent current, and 0.45V dropout voltage. The differences are in packaging format: LP2950ACDT-5.0G is supplied in Tube, LP2950ACDT-5RKG is supplied in Cut Tape with Digi-Reel, and LP2950CDT-5.0G is supplied in Tube. Select based on your procurement and assembly requirements.

Q: Why do Rohm BA series parts specify 25V maximum input voltage while the original LP2950CDTX-5.0 specifies 30V?

A: The Rohm parts are rated for 25V maximum input, which is still suitable for standard 5V regulator applications where input voltage typically ranges from 7V to 20V. If your application requires operation above 25V input, the onsemi LP2950 variants or STMicroelectronics LD29150DT50R are more appropriate choices.

Q: Are all substitute parts RoHS compliant?

A: The onsemi LP2950 variants and all Rohm BA series parts are ROHS3 compliant. The National Semiconductor LP2950CDTX-5.0/NOPB does not specify RoHS status. The STMicroelectronics LD29150DT50R is ROHS3 compliant. For new designs requiring RoHS compliance, select from the onsemi, Rohm, or STMicroelectronics options.

Q: What is the impact of different dropout voltages on my circuit design?

A: Dropout voltage determines the minimum voltage difference required between input and output for proper regulation. The original LP2950CDTX-5.0 has 0.6V dropout at 100mA. The onsemi variants reduce this to 0.45V, improving efficiency. Rohm BA series parts specify 2V typical dropout at their rated currents. Lower dropout voltage reduces power dissipation in the regulator and allows operation with lower input voltages. Select based on your minimum input voltage requirement and thermal budget.

Q: Can I substitute the LP2950CDTX-5.0 in a design requiring -40°C to 125°C operation?

A: Yes, with the onsemi LP2950 variants (all rated -40°C to 125°C) or the STMicroelectronics LD29150DT50R. Rohm BA series parts are rated only to 85°C maximum, making them unsuitable for the full temperature range. Verify that your application's thermal management can accommodate the regulator's quiescent current and power dissipation across the entire temperature range.

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