LP2951ACMM/NOPB Equivalent & Substitute Parts

Part Overview

The LP2951ACMM/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive adjustable (fixed) output applications. This Surface Mount device delivers 100mA output current in an 8-VSSOP package and operates across an input voltage range of up to 30V with output adjustability from 1.235V to 29V. The part is currently in Active product status with 27,090 units in stock.

Substitute parts are necessary when the primary part reaches end-of-life status, inventory constraints occur, or alternative packaging formats are required for manufacturing flexibility while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
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-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package	8-VSSOP
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LP2951ACMM/NOPB are classified into two categories based on parametric equivalence and manufacturer recommendation:

Parametric Equivalents (Texas Instruments LP2951 Series): LP2951ACMM, LP2951ACMMX/NOPB, LP2951CMM/NOPB, and LP2951CMMX/NOPB maintain identical electrical specifications across all critical parameters: 100mA output current, 30V maximum input voltage, 1.235V to 29V output range, 0.6V dropout voltage, 120 µA quiescent current, and identical protection features (Over Current, Over Temperature, Short Circuit). These parts differ only in product status (Active vs. Last Time Buy) and packaging format (Cut Tape vs. Tape & Reel). All variants use the 8-VSSOP package footprint and are ROHS3 compliant with MSL 1 rating.

Manufacturer Recommended Substitute (Cross-Manufacturer): BD00FA1WEFJ-E2 from Rohm Semiconductor is designated as a manufacturer-recommended alternative. This part operates as a positive adjustable linear regulator with 100mA output current and shares the same Surface Mount mounting type and 8-pin package family (8-HTSOP-J). However, this substitute exhibits different electrical characteristics: 25V maximum input voltage (vs. 30V), 3V to 12V output range (vs. 1.235V to 29V), 3V dropout voltage (vs. 0.6V), and 450 µA quiescent current (vs. 120 µA). Operating temperature range is -25°C to 85°C (vs. -40°C to 125°C).

Substitution eligibility is determined strictly by matching the allowed electrical parameters: output configuration, output type, number of regulators, current rating, voltage specifications, protection features, and package compatibility.

Parameter Comparison

Parameter	LP2951ACMM/NOPB	LP2951ACMM	LP2951ACMMX/NOPB	LP2951CMM/NOPB	LP2951CMMX/NOPB	BD00FA1WEFJ-E2
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Rohm Semiconductor
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive
Output Type	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable
Number of Regulators	1	1	1	1	1	1
Voltage - Input (Max)	30V	30V	30V	30V	30V	25V
Voltage - Output (Min/Fixed)	1.235V (5V)	1.235V (5V)	1.235V (5V)	1.235V (5V)	1.235V (5V)	3V
Voltage - Output (Max)	29V	29V	29V	29V	29V	12V
Voltage Dropout (Max)	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	3V @ 100mA
Current - Output	100mA	100mA	100mA	100mA	100mA	100mA
Current - Quiescent (Iq)	120 µA	120 µA	120 µA	120 µA	120 µA	450 µA
Current - Supply (Max)	14 mA	14 mA	14 mA	14 mA	14 mA	Not specified
Control Features	Enable	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	Over Current, Over Temperature, Soft Start
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)	-25°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Supplier Device Package	8-VSSOP	8-VSSOP	8-VSSOP	8-VSSOP	8-VSSOP	8-HTSOP-J
Product Status	Active	Last Time Buy	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory (Pcs)	27,090	29,751	6,400	12,000	1,756	4,823

Engineering Selection Recommendations

Texas Instruments LP2951 Series (Parametric Equivalents): LP2951ACMM, LP2951ACMMX/NOPB, LP2951CMM/NOPB, and LP2951CMMX/NOPB are direct parametric substitutes for the LP2951ACMM/NOPB. All variants maintain identical electrical performance and are ROHS3 compliant with MSL 1 rating. Selection among these equivalents is determined by product status and packaging requirements. LP2951ACMM carries Last Time Buy status, indicating limited future availability. LP2951ACMMX/NOPB and LP2951CMMX/NOPB are Active status parts with lower inventory levels (6,400 and 1,756 units respectively). LP2951CMM/NOPB is supplied in Tape & Reel format with 12,000 units available, while others are available in Cut Tape & Digi-Reel format. For applications requiring extended product lifecycle support, LP2951ACMMX/NOPB or LP2951CMM/NOPB are preferred due to Active status.

Rohm Semiconductor BD00FA1WEFJ-E2 (Manufacturer Recommended): This cross-manufacturer substitute is designated for applications where the LP2951 series is unavailable. The BD00FA1WEFJ-E2 is Active status with 4,823 units in stock. However, this part exhibits significant electrical differences that restrict its application scope. The maximum input voltage is limited to 25V (vs. 30V), output voltage range is constrained to 3V to 12V (vs. 1.235V to 29V), dropout voltage is substantially higher at 3V (vs. 0.6V), quiescent current is elevated at 450 µA (vs. 120 µA), and operating temperature range is narrower at -25°C to 85°C (vs. -40°C to 125°C). The package footprint differs (8-HTSOP-J vs. 8-VSSOP), requiring PCB layout verification. This substitute is suitable only for applications operating within its specified voltage and temperature constraints.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACMM replace LP2951ACMM/NOPB directly?

A: LP2951ACMM is a parametric equivalent with identical electrical specifications. However, it carries Last Time Buy product status, indicating limited future availability. For new designs or long-term production, LP2951ACMMX/NOPB or LP2951CMM/NOPB are recommended as Active status alternatives.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) & Digi-Reel packaging is supplied in smaller quantities suitable for prototyping and low-volume production. Tape & Reel (TR) packaging is supplied in larger reels for high-volume automated assembly. Electrical performance is identical; selection depends on production volume and assembly equipment compatibility.

Q: Can BD00FA1WEFJ-E2 be used in all LP2951ACMM/NOPB applications?

A: No. BD00FA1WEFJ-E2 has restricted electrical specifications. It cannot be used in applications requiring input voltages above 25V, output voltages below 3V or above 12V, operating temperatures below -25°C or above 85°C, or where the 0.6V dropout voltage specification is critical. Verify application requirements against the BD00FA1WEFJ-E2 datasheet before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (LP2951ACMM, LP2951ACMMX/NOPB, LP2951CMM/NOPB, LP2951CMMX/NOPB, and BD00FA1WEFJ-E2) are ROHS3 compliant with MSL 1 (Unlimited) rating.

Q: What is the significance of the /NOPB suffix?

A: The /NOPB suffix indicates the part is supplied without lead (Pb) plating, consistent with ROHS3 compliance. Parts with and without this suffix are functionally equivalent; the suffix denotes packaging and environmental compliance specifications only.

Q: Do the LP2951 variants require different PCB layouts?

A: No. All LP2951 variants use the 8-VSSOP package with identical pinout and footprint. PCB layouts are interchangeable. The BD00FA1WEFJ-E2 uses an 8-HTSOP-J package with different physical dimensions (0.154" vs. 0.118" width), requiring PCB layout verification before substitution.

Q: Which substitute offers the best inventory availability?

A: LP2951ACMM offers the highest inventory at 29,751 units. However, it carries Last Time Buy status. For Active status parts, LP2951CMM/NOPB provides the best availability at 12,000 units.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message