LP2951ACD-3.3R2G Equivalent & Substitute Parts

Part Overview

The LP2951ACD-3.3R2G is a linear voltage regulator IC from onsemi, delivering a fixed 3.3V output at 100mA in an 8-SOIC surface mount package. This device is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained across the specified parameter set.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	100mA
Input Voltage (Max)	30V
Voltage Dropout (Max)	0.45V @ 100mA
Package / Case	8-SOIC (0.154", 3.90mm Width)
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following electrical and mechanical criteria:

Primary Substitution Criteria:

Fixed 3.3V output voltage
100mA output current capability
30V maximum input voltage rating
8-SOIC package form factor
Operating temperature range -40°C to 125°C
ROHS3 compliance

Grouping Logic:

Parametric Equivalent (Automotive Grade): NCV2951ACD3.3R2G meets all electrical specifications identically to the main part. The distinction is packaging format (Tape & Reel vs. Cut Tape) and automotive qualification (AEC-Q100), which does not affect electrical substitutability.

Similar Parts (Texas Instruments LP2951 Series): LP2951ACM-3.3/NOPB, LP2951ACMX-3.3/NOPB, LP2951CM-3.3/NOPB, and LP2951CMX-3.3/NOPB are functionally equivalent with the following considerations: these devices feature adjustable output voltage capability (1.235V to 29V range) with fixed 3.3V configuration, Enable control feature, and enhanced protection (Short Circuit protection added). Voltage dropout specification is 0.6V @ 100mA versus 0.45V for the main part. Packaging variants include Tube and Cut Tape & Digi-Reel® options.

Parameter Comparison

Parameter	LP2951ACD-3.3R2G (onsemi)	NCV2951ACD3.3R2G (onsemi)	LP2951ACM-3.3/NOPB (TI)	LP2951ACMX-3.3/NOPB (TI)	LP2951CM-3.3/NOPB (TI)	LP2951CMX-3.3/NOPB (TI)
Manufacturer	onsemi	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage (Fixed)	3.3V	3.3V	3.3V	3.3V	3.3V	3.3V
Output Current	100mA	100mA	100mA	100mA	100mA	100mA
Input Voltage (Max)	30V	30V	30V	30V	30V	30V
Voltage Dropout (Max)	0.45V @ 100mA	0.45V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA
Quiescent Current (Iq)	120 µA	Not specified	120 µA	120 µA	120 µA	120 µA
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

NCV2951ACD3.3R2G is the direct parametric equivalent from onsemi. Selection of this part is appropriate when Tape & Reel packaging is required or when automotive-grade qualification (AEC-Q100) is mandated by application requirements. All electrical parameters are identical to the main part.

LP2951 Series from Texas Instruments (LP2951ACM-3.3/NOPB, LP2951ACMX-3.3/NOPB, LP2951CM-3.3/NOPB, LP2951CMX-3.3/NOPB) are functionally compatible substitutes with the following distinctions: voltage dropout is 0.15V higher (0.6V vs. 0.45V), additional Short Circuit protection is provided, and Enable control functionality is available. These parts maintain Active product status and ROHS3 compliance. Packaging options include Tube and Cut Tape & Digi-Reel® formats. Selection depends on packaging availability and whether the enhanced protection features and control capability provide value to the application.

Frequently Asked Questions (FAQ)

Q: Can NCV2951ACD3.3R2G be used as a direct replacement for LP2951ACD-3.3R2G?

A: Yes. NCV2951ACD3.3R2G is a parametric equivalent with identical electrical specifications. The primary difference is packaging format (Tape & Reel vs. Cut Tape) and automotive qualification. Both are onsemi products with Active status and ROHS3 compliance.

Q: What is the key difference between the onsemi LP2951ACD-3.3R2G and Texas Instruments LP2951 variants?

A: The Texas Instruments LP2951 series devices feature adjustable output voltage capability (1.235V to 29V) with fixed 3.3V configuration, Enable control, and Short Circuit protection. Voltage dropout is 0.6V @ 100mA compared to 0.45V for the onsemi part. All other electrical parameters and the 8-SOIC package remain equivalent.

Q: Are all substitute parts available in the same packaging?

A: No. Packaging varies: LP2951ACD-3.3R2G is Cut Tape & Digi-Reel®; NCV2951ACD3.3R2G is Tape & Reel; Texas Instruments variants are available in both Tube (ACM, CM) and Cut Tape & Digi-Reel® (ACMX, CMX) formats. Verify packaging requirements before selection.

Q: Does the higher voltage dropout of Texas Instruments parts affect circuit performance?

A: Voltage dropout difference is 0.15V (0.6V vs. 0.45V @ 100mA). This affects power dissipation and minimum input voltage requirements. Verify that your input voltage headroom accommodates the higher dropout specification for your application.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and Active product status, meeting current regulatory requirements.

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