LP2951CSD Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2951CSD is a linear voltage regulator IC from Texas Instruments designed for positive adjustable (fixed) output applications with 100mA current capability in an 8-WSON (4x4) surface mount package. This part is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and production continuity. Direct manufacturer substitutes with identical electrical and mechanical specifications are available from Texas Instruments in active product status.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	8-WDFN Exposed Pad
Supplier Device Package	8-WSON (4x4)
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LP2951CSD 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)
Supply current (14 mA)
Protection features (Over Current, Over Temperature, Short Circuit)
Operating temperature range (-40°C ~ 125°C)
Package / Case (8-WDFN Exposed Pad)
Supplier device package (8-WSON 4x4)

All identified substitutes maintain identical electrical performance and mechanical compatibility. Differences exist only in product status (active vs. obsolete), RoHS compliance level, and packaging format (Cut Tape, Digi-Reel, or Tape & Reel).

Parameter Comparison

Part Number	Manufacturer	Product Status	RoHS Status	Packaging	Inventory (Pcs)	Output Current	Voltage Dropout	Operating Temp
LP2951CSD	Texas Instruments	Obsolete	RoHS non-compliant	-	2000	100mA	0.6V @ 100mA	-40°C ~ 125°C
LP2951CSD/NOPB	Texas Instruments	Active	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®	2200	100mA	0.6V @ 100mA	-40°C ~ 125°C
LP2951ACSD/NOPB	Texas Instruments	Active	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®	30400	100mA	0.6V @ 100mA	-40°C ~ 125°C
LP2951ACSDX/NOPB	Texas Instruments	Active	ROHS3 Compliant	-	9200	100mA	0.6V @ 100mA	-40°C ~ 125°C
LP2951CSDX/NOPB	Texas Instruments	Active	ROHS3 Compliant	Tape & Reel (TR)	4800	100mA	0.6V @ 100mA	-40°C ~ 125°C

Engineering Selection Recommendations

All substitute parts listed maintain complete electrical and mechanical equivalence to the LP2951CSD. Selection among active alternatives should be based on the following criteria:

Product Status: The LP2951CSD is obsolete. All substitute parts (LP2951CSD/NOPB, LP2951ACSD/NOPB, LP2951ACSDX/NOPB, LP2951CSDX/NOPB) are active products, ensuring long-term availability and manufacturing support.

RoHS Compliance: The original LP2951CSD is RoHS non-compliant. All active substitutes are ROHS3 compliant, meeting current environmental and regulatory requirements for commercial and industrial applications.

Packaging Format: Selection depends on procurement and assembly requirements. LP2951CSD/NOPB and LP2951ACSD/NOPB are available in Cut Tape and Digi-Reel formats suitable for automated pick-and-place assembly. LP2951CSDX/NOPB is supplied in Tape & Reel format for high-volume production. LP2951ACSDX/NOPB is available without specified packaging format.

Inventory Availability: LP2951ACSD/NOPB offers the highest inventory level (30400 Pcs), followed by LP2951ACSDX/NOPB (9200 Pcs), LP2951CSDX/NOPB (4800 Pcs), and LP2951CSD/NOPB (2200 Pcs).

Frequently Asked Questions (FAQ)

Q: Can LP2951CSD/NOPB directly replace the obsolete LP2951CSD?

A: Yes. LP2951CSD/NOPB is a direct manufacturer equivalent with identical electrical specifications, output current (100mA), voltage dropout (0.6V @ 100mA), operating temperature range (-40°C ~ 125°C), and 8-WSON (4x4) package. The primary differences are active product status and ROHS3 compliance.

Q: What is the difference between LP2951ACSD/NOPB and LP2951CSD/NOPB?

A: Both parts are parametric equivalents with identical electrical performance and package specifications. The "A" designation in LP2951ACSD/NOPB indicates a different temperature or performance grade variant within the same product family. All electrical parameters, including output current, voltage dropout, and operating temperature range, remain identical.

Q: Are all substitute parts compatible with the same PCB layout?

A: Yes. All substitute parts use the identical 8-WDFN Exposed Pad package (8-WSON 4x4 supplier device package) with the same pinout, footprint, and thermal characteristics. PCB layout modifications are not required.

Q: What packaging formats are available for production assembly?

A: LP2951CSD/NOPB and LP2951ACSD/NOPB are supplied in Cut Tape (CT) and Digi-Reel® formats suitable for automated assembly. LP2951CSDX/NOPB is supplied in Tape & Reel (TR) format for high-volume manufacturing. The "X" suffix indicates extended packaging options.

Q: Does the NOPB suffix affect electrical performance?

A: No. The NOPB suffix indicates "No Plumbum" (lead-free) packaging and RoHS compliance. Electrical specifications, performance characteristics, and functional operation remain identical to non-NOPB variants.

Q: Which substitute part should be selected for new designs?

A: For new designs, select from active products with ROHS3 compliance: LP2951CSD/NOPB, LP2951ACSD/NOPB, LP2951ACSDX/NOPB, or LP2951CSDX/NOPB. Choice depends on packaging requirements and procurement volume. LP2951ACSD/NOPB offers the highest inventory availability.

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