LP5951MFX-3.0/NOPB Equivalent & Substitute Parts

Part Overview

The LP5951MFX-3.0/NOPB is a linear voltage regulator IC manufactured by Texas Instruments, designed for positive fixed 3V output applications with 150mA current capacity. This Surface Mount device in SOT-23-5 packaging is classified as Active product status and serves as a power management solution in PMIC category applications. Substitute parts are identified when equivalent electrical performance, output voltage, current rating, and package compatibility align with the original specification, enabling component sourcing flexibility while maintaining circuit functionality.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LP5951MFX-3.0/NOPB
Output Voltage (Fixed)	3V
Output Current	150mA
Input Voltage (Max)	5.5V
Voltage Dropout (Max)	0.35V @ 150mA
Package Type	SOT-23-5 (SC-74A, SOT-753)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts are classified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Output voltage configuration: Fixed 3V or 3.3V
Output current rating: Minimum 150mA
Input voltage maximum: 5.5V or higher
Package type: SOT-23-5 or TSOT-23-5 (pin-compatible Surface Mount)
Operating temperature range: -40°C to 125°C minimum
Product status: Active
RoHS compliance: ROHS3 Compliant

Grouping Logic:

Exact Parametric Match: LP5951MF-3.0/NOPB (Texas Instruments) — identical specifications with alternative packaging format
Manufacturer Recommended Equivalents: ADP121-AUJZ30R7, ADP160AUJZ-3.0-R7, ADP1710AUJZ-3.0-R7 (Analog Devices) — meet all electrical and thermal requirements with enhanced quiescent current performance
Cross-Manufacturer Alternatives: BU30SD2MG-MTR (Rohm), LD39015M33R (STMicroelectronics), MIC5307-3.0YD5-TR, MIC5365-3.3YD5-TR (Microchip), NCP702SN33T1G (onsemi) — functionally equivalent with package compatibility

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Operating Temp	RoHS Status
LP5951MFX-3.0/NOPB	Texas Instruments	3V	150mA	5.5V	0.35V @ 150mA	55 µA	SOT-23-5	-40°C ~ 125°C	ROHS3
LP5951MF-3.0/NOPB	Texas Instruments	3V	150mA	5.5V	0.35V @ 150mA	55 µA	SOT-23-5	-40°C ~ 125°C	ROHS3
ADP121-AUJZ30R7	Analog Devices Inc.	3V	150mA	5.5V	—	21 µA	TSOT-23-5	-40°C ~ 125°C	ROHS3
ADP160AUJZ-3.0-R7	Analog Devices Inc.	3V	150mA	5.5V	—	1.25 µA	TSOT-23-5	-40°C ~ 125°C	ROHS3
ADP160AUJZ-3.3-R7	Analog Devices Inc.	3.3V	150mA	5.5V	0.225V @ 150mA	1.25 µA	TSOT-23-5	-40°C ~ 125°C	ROHS3
ADP1710AUJZ-3.0-R7	Analog Devices Inc.	3V	150mA	5.5V	0.3V @ 150mA	50 µA	TSOT-23-5	-40°C ~ 125°C	ROHS3
BU30SD2MG-MTR	Rohm Semiconductor	3V	200mA	6V	0.15V @ 100mA	80 µA	5-SSOP	-40°C ~ 105°C	ROHS3
LD39015M33R	STMicroelectronics	3.3V	150mA	5.5V	0.1V @ 100mA	50 µA	SOT-23-5	-40°C ~ 125°C	ROHS3
MIC5307-3.0YD5-TR	Microchip Technology	3V	300mA	5.5V	0.25V @ 300mA	30 µA	TSOT-23-5	-40°C ~ 125°C	ROHS3
MIC5365-3.3YD5-TR	Microchip Technology	3.3V	150mA	5.5V	0.31V @ 150mA	39 µA	TSOT-23-5	-40°C ~ 125°C	ROHS3
NCP702SN33T1G	onsemi	3.3V	200mA	5.5V	—	16 µA	5-TSOP	-40°C ~ 125°C	ROHS3

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): LP5951MF-3.0/NOPB is the direct equivalent with identical electrical performance and thermal characteristics. Both parts share the same base product number LP5951 and maintain full compatibility in circuit applications requiring 3V, 150mA output.

Preferred Alternatives (Manufacturer Recommended): Analog Devices ADP series regulators (ADP121-AUJZ30R7, ADP160AUJZ-3.0-R7, ADP1710AUJZ-3.0-R7) are manufacturer-recommended substitutes offering superior quiescent current performance (1.25 µA to 21 µA versus 55 µA), reducing standby power consumption. All maintain Active product status and ROHS3 compliance with -40°C to 125°C operating range.

Cross-Manufacturer Options: Microchip MIC5307-3.0YD5-TR and MIC5365-3.3YD5-TR provide higher current capability (300mA and 150mA respectively) with improved PSRR characteristics. STMicroelectronics LD39015M33R offers lower dropout voltage (0.1V @ 100mA) for applications with tighter supply margins. Rohm BU30SD2MG-MTR includes automotive AEC-Q100 qualification with 200mA output and 6V input rating. onsemi NCP702SN33T1G provides 200mA output with integrated soft start and UVLO protection.

Selection Criteria: All substitute parts maintain Active product status, ROHS3 compliance, and Surface Mount packaging. Selection depends on specific application requirements: quiescent current optimization, output current headroom, dropout voltage tolerance, and thermal operating range constraints.

Frequently Asked Questions (FAQ)

Q: Can LP5951MF-3.0/NOPB replace LP5951MFX-3.0/NOPB directly? A: Yes. Both parts are identical in electrical specifications and thermal performance. The difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel), which does not affect circuit functionality.

Q: Are TSOT-23-5 and SOT-23-5 packages pin-compatible? A: Yes. TSOT-23-5 (Thin SOT-23-5) and SOT-23-5 are pin-compatible packages with identical pinout and footprint. Both fit the same PCB layout without modification.

Q: Can I use ADP160AUJZ-3.0-R7 instead of LP5951MFX-3.0/NOPB? A: Yes, with consideration for quiescent current differences. ADP160AUJZ-3.0-R7 provides identical 3V output and 150mA current rating with significantly lower quiescent current (1.25 µA versus 55 µA), beneficial for battery-powered applications. Package compatibility is confirmed (TSOT-23-5).

Q: What is the difference between 3V and 3.3V output variants? A: Output voltage is fixed at manufacturing. 3V variants (LP5951MFX-3.0/NOPB, ADP160AUJZ-3.0-R7, ADP1710AUJZ-3.0-R7, MIC5307-3.0YD5-TR) are for 3V logic and sensor applications. 3.3V variants (ADP160AUJZ-3.3-R7, LD39015M33R, MIC5365-3.3YD5-TR, NCP702SN33T1G) are for 3.3V I/O and memory applications. Selection depends on downstream circuit requirements.

Q: Why would I choose MIC5307-3.0YD5-TR with 300mA output? A: MIC5307-3.0YD5-TR provides higher current headroom (300mA versus 150mA) for applications requiring additional load capacity or future expansion. It maintains identical 3V output, 5.5V input maximum, and -40°C to 125°C operating range with TSOT-23-5 package compatibility.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 Compliant status, meeting environmental and hazardous substance restrictions for commercial and industrial applications.

Q: What is the significance of dropout voltage specifications? A: Dropout voltage determines the minimum input-to-output voltage differential required for regulation. Lower dropout voltage (LD39015M33R at 0.1V @ 100mA) allows operation with lower input supplies. Higher dropout voltage (MIC5365-3.3YD5-TR at 0.31V @ 150mA) requires greater input margin. Selection depends on available supply voltage headroom in the application.

Q: Can I use NCP702SN33T1G as a substitute for 3V applications? A: No. NCP702SN33T1G is fixed at 3.3V output, not 3V. It is suitable only for applications designed for 3.3V logic levels. For 3V applications, use 3V-rated variants such as LP5951MFX-3.0/NOPB, ADP160AUJZ-3.0-R7, or MIC5307-3.0YD5-TR.

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