LP2951CMMX-3.3 Equivalent & Substitute Parts

Part Overview

The LP2951CMMX-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive adjustable (fixed) output applications with 100mA current capacity in an 8-VSSOP package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within the allowed parameter ranges for this power management category.

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 (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-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package	8-VSSOP
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LP2951CMMX-3.3 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Output Configuration: Positive
Output Type: Adjustable (Fixed) or Fixed
Number of Regulators: 1
Voltage - Input (Max): 30V or greater
Voltage - Output (Min/Fixed): 1.235V to 3.3V range
Voltage - Output (Max): 29V or greater
Current - Output: 100mA or greater
Operating Temperature: -40°C ~ 125°C
Mounting Type: Surface Mount
Package / Case: 8-TSSOP, 8-MSOP compatible

Substitute Categories:

Direct Manufacturer Equivalents (Texas Instruments LP2951 Series): Parts LP2951CMMX-3.3/NOPB, LP2951ACMM-3.3/NOPB, LP2951ACMMX-3.3/NOPB, and LP2951CMM-3.3/NOPB maintain identical electrical specifications and differ only in packaging configuration (Cut Tape, Digi-Reel, or Tape & Reel) and product status (Active vs. Obsolete). These are direct functional equivalents.

Parametric Equivalents (Cross-Manufacturer): LP2951ACDM-3.3RG (onsemi) and MIC5236-3.3YMM-TR (Microchip Technology) meet the core electrical requirements but may differ in specific parameters such as dropout voltage, quiescent current, or current output capacity within acceptable ranges for the application category.

Parameter Comparison

Parameter	LP2951CMMX-3.3	LP2951CMMX-3.3/NOPB	LP2951ACMM-3.3/NOPB	LP2951ACMMX-3.3/NOPB	LP2951CMM-3.3/NOPB	LP2951ACDM-3.3RG	MIC5236-3.3YMM-TR
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	onsemi	Microchip Technology
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive	Positive
Output Type	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Fixed	Fixed
Voltage - Input (Max)	30V	30V	30V	30V	30V	30V	30V
Voltage - Output (Min/Fixed)	1.235V (3.3V)	1.235V (3.3V)	1.235V (3.3V)	1.235V (3.3V)	1.235V (3.3V)	3.3V	3.3V
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	0.45V @ 100mA	0.5V @ 150mA
Current - Output	100mA	100mA	100mA	100mA	100mA	100mA	150mA
Current - Quiescent (Iq)	120 µA	120 µA	120 µA	120 µA	120 µA	120 µA	30 µA
Current - Supply (Max)	14 mA	14 mA	14 mA	14 mA	14 mA	12 mA	5 mA
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)	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Preferred): Select LP2951CMMX-3.3/NOPB, LP2951ACMM-3.3/NOPB, LP2951ACMMX-3.3/NOPB, or LP2951CMM-3.3/NOPB. All are active Texas Instruments products with ROHS3 compliance and identical electrical specifications to the obsolete LP2951CMMX-3.3. Selection among these four depends on packaging requirements: Cut Tape (CT) & Digi-Reel for LP2951CMMX-3.3/NOPB, standard tape & reel for LP2951CMM-3.3/NOPB and LP2951ACMMX-3.3/NOPB, or cut tape for LP2951ACMM-3.3/NOPB.

For Cross-Manufacturer Substitution: LP2951ACDM-3.3RG (onsemi) is suitable where fixed 3.3V output is acceptable and improved dropout voltage (0.45V vs. 0.6V) is beneficial. This part is ROHS3 compliant and active.

MIC5236-3.3YMM-TR (Microchip Technology) provides higher output current (150mA vs. 100mA), lower quiescent current (30 µA vs. 120 µA), and enhanced protection features (Load Dump, Over Voltage, Reverse Polarity). This part is ROHS3 compliant and active. Selection is appropriate for applications requiring higher current capacity or improved power efficiency.

All substitute options maintain the required 8-MSOP package footprint and -40°C to 125°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can LP2951CMMX-3.3/NOPB be used as a direct replacement for LP2951CMMX-3.3?

A: Yes. LP2951CMMX-3.3/NOPB is the active equivalent with identical electrical specifications. The difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). The "/NOPB" suffix indicates lead-free packaging.

Q: What is the difference between LP2951ACMM-3.3/NOPB and LP2951CMM-3.3/NOPB?

A: Both are Texas Instruments LP2951 variants with identical electrical parameters. The primary difference is packaging configuration: LP2951ACMM-3.3/NOPB is supplied in Cut Tape & Digi-Reel format, while LP2951CMM-3.3/NOPB is supplied in Tape & Reel format. Electrical performance is equivalent.

Q: Is LP2951ACDM-3.3RG (onsemi) compatible with the original LP2951CMMX-3.3?

A: LP2951ACDM-3.3RG is a parametric equivalent suitable for applications requiring fixed 3.3V output. It meets the core electrical requirements (30V input, 100mA output, -40°C to 125°C operation) and shares the 8-MSOP package. However, it differs in output type (Fixed vs. Adjustable) and has improved dropout voltage (0.45V). Verify that fixed 3.3V output is acceptable for your application.

Q: Can MIC5236-3.3YMM-TR replace the LP2951CMMX-3.3?

A: MIC5236-3.3YMM-TR is a functional substitute with higher output current (150mA vs. 100mA) and lower quiescent current (30 µA vs. 120 µA). It maintains the 8-MSOP package and -40°C to 125°C operating temperature. The fixed 3.3V output and enhanced protection features (Load Dump, Over Voltage, Reverse Polarity) make it suitable for applications where these characteristics are beneficial or required.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed (LP2951CMMX-3.3/NOPB, LP2951ACMM-3.3/NOPB, LP2951ACMMX-3.3/NOPB, LP2951CMM-3.3/NOPB, LP2951ACDM-3.3RG, and MIC5236-3.3YMM-TR) are ROHS3 compliant. The original LP2951CMMX-3.3 is RoHS non-compliant.

Q: What is the package compatibility between these parts?

A: All listed parts use the 8-TSSOP or 8-MSOP package with 0.118" (3.00mm) width. PCB footprints are compatible across all options.

Q: Which substitute offers the best power efficiency?

A: MIC5236-3.3YMM-TR has the lowest quiescent current (30 µA vs. 120 µA for LP2951 variants) and lowest maximum supply current (5 mA vs. 12-14 mA), making it the most power-efficient option for battery-powered or low-power applications.

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