LP2951CSD-3.3 Equivalent & Substitute Parts

Part Overview

The LP2951CSD-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive adjustable (fixed) output applications. This component delivers 100mA output current in an 8-WSON (4x4) surface mount package with integrated protection features including over-current, over-temperature, and short-circuit protection.

The main part (LP2951CSD-3.3) carries an obsolete product status. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications requiring this regulator topology and electrical performance.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable (Fixed)
Number of Regulators	1
Voltage - Input (Max)	30V
Voltage - Output (Min/Fixed)	1.235V (3.3V)
Voltage - Output (Max)	29V
Voltage Dropout (Max)	0.6V @ 100mA
Current - Output	100mA
Current - Quiescent (Iq)	120 µA
Current - Supply (Max)	14 mA
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	8-WDFN Exposed Pad
Supplier Device Package	8-WSON (4x4)

Substitute Part Grouping Explanation

Substitution for the LP2951CSD-3.3 is determined by electrical and mechanical parameter equivalence across the following criteria:

Critical Substitution Parameters:

Output configuration (Positive)
Output type (Adjustable/Fixed)
Voltage specifications (Input Max: 30V, Output: 1.235V/3.3V fixed, Output Max: 29V)
Current rating (100mA output, 120 µA quiescent)
Dropout voltage (0.6V @ 100mA)
Protection features (Over Current, Over Temperature, Short Circuit)
Operating temperature range (-40°C ~ 125°C)
Package type (8-WSON 4x4, 8-WDFN Exposed Pad)
Mounting type (Surface Mount)

All substitute parts listed maintain identical electrical performance and mechanical compatibility with the main part number across these parameters.

Parameter Comparison

Parameter	LP2951CSD-3.3	LP2951CSD-3.3/NOPB	LP2951ACSDX-3.3/NOPB	LP2951CSDX-3.3/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active
Packaging	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
Output Configuration	Positive	Positive	Positive	Positive
Output Type	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)
Voltage - Input (Max)	30V	30V	30V	30V
Voltage - Output (Min/Fixed)	1.235V (3.3V)	1.235V (3.3V)	1.235V (3.3V)	1.235V (3.3V)
Voltage - Output (Max)	29V	29V	29V	29V
Voltage Dropout (Max)	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA
Current - Output	100mA	100mA	100mA	100mA
Current - Quiescent (Iq)	120 µA	120 µA	120 µA	120 µA
Current - Supply (Max)	14 mA	14 mA	14 mA	14 mA
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	8-WDFN Exposed Pad	8-WDFN Exposed Pad	8-WDFN Exposed Pad	8-WDFN Exposed Pad
Supplier Device Package	8-WSON (4x4)	8-WSON (4x4)	8-WSON (4x4)	8-WSON (4x4)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

LP2951CSD-3.3/NOPB is the direct manufacturer equivalent with identical electrical and mechanical specifications. This part carries active product status and ROHS3 compliance, making it the primary selection for new designs and obsolescence mitigation. The /NOPB suffix indicates lead-free plating and Tape & Reel packaging suitable for automated assembly.

LP2951ACSDX-3.3/NOPB and LP2951CSDX-3.3/NOPB are parametric equivalents offering identical electrical performance and package compatibility. Both parts maintain active product status and ROHS3 compliance. The CSDX variant provides 4900 pcs inventory availability, while the ACSDX variant provides 1011 pcs availability. Selection between these variants depends on supply chain requirements and procurement lead times.

All three substitute parts are electrically and mechanically interchangeable with the obsolete LP2951CSD-3.3 across the specified parameter set.

Frequently Asked Questions (FAQ)

Q: Can LP2951CSD-3.3/NOPB directly replace LP2951CSD-3.3?

A: Yes. Both parts share identical electrical specifications (30V input max, 3.3V fixed output, 100mA current, 0.6V dropout), protection features, operating temperature range, and 8-WSON (4x4) package. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between LP2951CSDX-3.3/NOPB and LP2951ACSDX-3.3/NOPB?

A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The difference lies in the device grade designation (C vs. A) and inventory availability (4900 pcs vs. 1011 pcs). Electrical performance and package compatibility remain equivalent.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes. LP2951CSD-3.3/NOPB, LP2951ACSDX-3.3/NOPB, and LP2951CSDX-3.3/NOPB are all supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes. The original LP2951CSD-3.3 was supplied in bulk packaging.

Q: Do the substitute parts meet RoHS requirements?

A: LP2951CSD-3.3/NOPB, LP2951ACSDX-3.3/NOPB, and LP2951CSDX-3.3/NOPB are all ROHS3 compliant. The original LP2951CSD-3.3 is RoHS non-compliant.

Q: Is the 8-WSON (4x4) package footprint identical across all parts?

A: Yes. All parts use the 8-WDFN Exposed Pad package with 8-WSON (4x4) supplier device package designation, ensuring PCB layout and assembly compatibility without modification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message