LP2951CSDX Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2951CSDX is a linear voltage regulator IC from Texas Instruments designed for positive adjustable (fixed) output applications. This device delivers 100mA output current in an 8-WSON (4x4) surface mount package and includes integrated protection features for over-current, over-temperature, and short-circuit conditions.

The LP2951CSDX is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this regulator topology.

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 (5V)
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)
Base Product Number	LP2951
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LP2951CSDX is determined by strict equivalence across the following critical parameters:

Output configuration (Positive)
Output type (Adjustable/Fixed)
Number of regulators (1)
Voltage specifications (Input Max: 30V, Output Min/Fixed: 1.235V/5V, Output Max: 29V)
Dropout voltage (0.6V @ 100mA)
Output current (100mA)
Quiescent current (120 µA)
Protection features (Over Current, Over Temperature, Short Circuit)
Operating temperature range (-40°C ~ 125°C)
Package type (8-WDFN Exposed Pad / 8-WSON 4x4)

All substitute parts listed maintain identical electrical and mechanical specifications. Differences exist only in product status, packaging format (tape & reel vs. cut tape), and RoHS compliance status.

Parameter Comparison

Parameter	LP2951CSDX	LP2951CSDX/NOPB	LP2951ACSD/NOPB	LP2951ACSDX/NOPB	LP2951CSD/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active
Output Configuration	Positive	Positive	Positive	Positive	Positive
Output Type	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)
Voltage - Input (Max)	30V	30V	30V	30V	30V
Voltage - Output (Min/Fixed)	1.235V (5V)	1.235V (5V)	1.235V (5V)	1.235V (5V)	1.235V (5V)
Voltage - Output (Max)	29V	29V	29V	29V	29V
Voltage Dropout (Max)	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA
Current - Output	100mA	100mA	100mA	100mA	100mA
Current - Quiescent (Iq)	120 µA	120 µA	120 µA	120 µA	120 µA
Current - Supply (Max)	14 mA	14 mA	14 mA	14 mA	14 mA
Control Features	Enable	Enable	Enable	Enable	Enable
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	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)	-40°C ~ 125°C (TJ)
Package / Case	8-WDFN Exposed Pad	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)	8-WSON (4x4)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Packaging Format	Bulk	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Bulk	Cut Tape (CT) & Digi-Reel®
Inventory Status	1102 Pcs New Original In Stock	4800 Pcs New Original In Stock	30400 Pcs New Original In Stock	9200 Pcs New Original In Stock	2200 Pcs New Original In Stock

Engineering Selection Recommendations

All substitute parts maintain complete electrical and mechanical equivalence to the LP2951CSDX. Selection among available alternatives should be based on the following factors:

Product Status: The LP2951CSDX is obsolete. All active alternatives (LP2951CSDX/NOPB, LP2951ACSD/NOPB, LP2951ACSDX/NOPB, LP2951CSD/NOPB) are in active production status and provide ongoing supply chain support.

RoHS Compliance: The original LP2951CSDX is RoHS non-compliant. All active substitutes are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and production.

Packaging Format: Selection between tape & reel, cut tape, and bulk packaging depends on production volume and assembly line requirements. Tape & reel (LP2951CSDX/NOPB) is suitable for high-volume automated assembly. Cut tape & Digi-Reel (LP2951ACSD/NOPB, LP2951CSD/NOPB) accommodates medium-volume production. Bulk packaging (LP2951ACSDX/NOPB) supports lower-volume or prototype applications.

Inventory Availability: LP2951ACSD/NOPB offers the highest inventory level (30400 pcs), providing maximum supply assurance for critical applications.

Frequently Asked Questions (FAQ)

Q: Can LP2951CSDX be directly replaced with LP2951CSDX/NOPB?

A: Yes. LP2951CSDX/NOPB is a direct substitute with identical electrical specifications, package type, and pin configuration. The primary differences are active product status and ROHS3 compliance. The "/NOPB" suffix indicates lead-free (Pb-free) processing.

Q: What is the difference between LP2951ACSD/NOPB and LP2951ACSDX/NOPB?

A: Both parts are parametrically equivalent with identical electrical performance. The difference is packaging format: LP2951ACSD/NOPB is supplied in cut tape & Digi-Reel format, while LP2951ACSDX/NOPB is supplied in bulk. Select based on assembly process requirements.

Q: Is the 8-WSON (4x4) package compatible with 8-WDFN Exposed Pad footprints?

A: Yes. The 8-WSON (4x4) and 8-WDFN Exposed Pad designations refer to the same physical package. All substitute parts use this identical package type and are footprint-compatible.

Q: Why should I choose an active product over the obsolete LP2951CSDX?

A: Active products ensure long-term supply availability, ongoing manufacturer support, and compliance with current environmental regulations (ROHS3). Obsolete parts face discontinuation risk and may not meet regulatory requirements for new applications.

Q: Are all substitute parts suitable for the same operating temperature range?

A: Yes. All substitute parts operate across the identical temperature range of -40°C to 125°C (junction temperature), ensuring thermal performance equivalence in all environmental conditions.

Q: Can I mix packaging formats in the same production run?

A: Packaging format selection should align with your assembly equipment and process requirements. Tape & reel, cut tape, and bulk formats are physically equivalent but require different handling during assembly. Consistency within a production run is recommended for process control.

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