LP5951MG-2.5 Equivalent & Substitute Parts

Part Overview

The LP5951MG-2.5 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 2.5V output at 150mA with a maximum dropout voltage of 0.35V, housed in a 5-TSSOP (SC-70-5) surface mount package. The original part is marked as obsolete, making equivalent and substitute parts essential for ongoing production, maintenance, and design continuity. Substitute parts must maintain identical electrical performance and mechanical compatibility while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	150mA
Maximum Input Voltage	5.5V
Maximum Dropout Voltage	0.35V @ 150mA
Quiescent Current	55 µA
Operating Temperature Range	-40°C to 125°C
Package Type	5-TSSOP (SC-70-5, SOT-353)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following electrical and mechanical parameters:

Fixed output voltage of 2.5V
Output current capability of 150mA minimum
Maximum input voltage of 5.5V or greater
Surface mount packaging compatible with 5-TSSOP footprint (SC-70-5, SOT-353)
Operating temperature range of -40°C to 125°C minimum
Enable control feature
Over current and over temperature protection

Parts are grouped into two categories: parametric equivalents (identical specifications, same manufacturer) and manufacturer-recommended alternatives (equivalent performance, different manufacturers with active product status).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Max Input Voltage	Dropout Voltage @ 150mA	Quiescent Current	Operating Temp Range	Package	Product Status	RoHS Status
LP5951MG-2.5	Texas Instruments	2.5V	150mA	5.5V	0.35V	55 µA	-40°C to 125°C	SC-70-5	Obsolete	RoHS Non-Compliant
LP5951MG-2.5/NOPB	Texas Instruments	2.5V	150mA	5.5V	0.35V	55 µA	-40°C to 125°C	SC-70-5	Active	ROHS3 Compliant
LP5951MGX-2.5/NOPB	Texas Instruments	2.5V	150mA	5.5V	0.35V	55 µA	-40°C to 125°C	SC-70-5	Active	ROHS3 Compliant
LD59015C25R	STMicroelectronics	2.5V	150mA	5.5V	0.21V	60 µA	-40°C to 125°C	SOT-323-5	Active	ROHS3 Compliant
MIC5365-2.5YC5-TR	Microchip Technology	2.5V	150mA	5.5V	0.38V	39 µA	-40°C to 125°C	SC-70-5	Active	ROHS3 Compliant
MIC5366-2.5YC5-TR	Microchip Technology	2.5V	150mA	5.5V	0.38V	39 µA	-40°C to 125°C	SC-70-5	Active	ROHS3 Compliant
RT9030-25GU5	Richtek USA Inc.	2.5V	150mA	5.5V	0.15V	50 µA	-40°C to 85°C	SC-70-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

Texas Instruments LP5951 Series (Parametric Equivalents)

LP5951MG-2.5/NOPB and LP5951MGX-2.5/NOPB are direct parametric equivalents to the obsolete LP5951MG-2.5. Both maintain identical electrical specifications and package compatibility. Both parts carry active product status and ROHS3 compliance, making them the preferred choice for direct replacement in existing designs. LP5951MG-2.5/NOPB offers higher inventory availability (26,803 units) compared to LP5951MGX-2.5/NOPB (3,022 units).

STMicroelectronics LD59015C25R

The LD59015C25R is a manufacturer-recommended alternative offering superior dropout voltage performance (0.21V versus 0.35V), beneficial in applications with tight input voltage margins. The part maintains identical output voltage, current, and temperature range specifications. The SOT-323-5 package is mechanically compatible with SC-70-5 footprints. Active product status and ROHS3 compliance are confirmed. Quiescent current is marginally higher at 60 µA.

Microchip Technology MIC5365-2.5YC5-TR and MIC5366-2.5YC5-TR

Both Microchip parts deliver superior quiescent current performance (39 µA versus 55 µA) and enhanced PSRR characteristics (80dB to 65dB across 1kHz to 10kHz). Dropout voltage is slightly higher at 0.38V. Both maintain SC-70-5 package compatibility, active product status, and ROHS3 compliance. MIC5366-2.5YC5-TR offers higher inventory (4,070 units) than MIC5365-2.5YC5-TR (2,100 units).

Richtek USA Inc. RT9030-25GU5

The RT9030-25GU5 provides the lowest dropout voltage (0.15V) and competitive quiescent current (50 µA). Operating temperature range is limited to -40°C to 85°C, making it unsuitable for applications requiring the full -40°C to 125°C range. Moisture sensitivity level is MSL-3 (168 hours) versus MSL-1 for all other parts. Active product status and ROHS3 compliance are confirmed.

Frequently Asked Questions (FAQ)

Q: Can LP5951MG-2.5/NOPB directly replace the obsolete LP5951MG-2.5?

A: Yes. LP5951MG-2.5/NOPB is a parametric equivalent with identical electrical specifications and SC-70-5 package compatibility. The primary difference is active product status and ROHS3 compliance certification. No design modifications are required.

Q: What is the difference between LP5951MG-2.5/NOPB and LP5951MGX-2.5/NOPB?

A: Both parts are parametric equivalents with identical electrical performance and package compatibility. The primary distinction is inventory availability and manufacturing date codes. Selection should be based on supply chain requirements and lead time.

Q: Is the LD59015C25R package compatible with existing LP5951MG-2.5 designs?

A: The LD59015C25R uses SOT-323-5 packaging, which is mechanically compatible with SC-70-5 footprints. However, PCB layout verification is recommended to confirm pin alignment and thermal performance in your specific application.

Q: Why do the Microchip parts (MIC5365 and MIC5366) have lower quiescent current?

A: Microchip's design achieves 39 µA quiescent current through different internal architecture. This reduces standby power consumption, beneficial in battery-powered or low-power applications. All other electrical parameters remain equivalent to the LP5951MG-2.5.

Q: Can RT9030-25GU5 be used in applications requiring -40°C to 125°C operation?

A: No. The RT9030-25GU5 operating temperature range is limited to -40°C to 85°C. It is unsuitable for applications requiring full -40°C to 125°C operation. Use Texas Instruments, STMicroelectronics, or Microchip alternatives for extended temperature range requirements.

Q: What does MSL-3 (168 hours) mean for the RT9030-25GU5?

A: Moisture Sensitivity Level 3 indicates the component requires baking before reflow soldering if exposed to ambient humidity for more than 168 hours. MSL-1 parts (all other substitutes) have unlimited shelf life without moisture conditioning. This adds process complexity for RT9030-25GU5 in production environments.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed carry ROHS3 compliance certification. The original LP5951MG-2.5 is RoHS non-compliant, making compliant substitutes necessary for applications subject to RoHS regulations.

Q: Which substitute offers the best dropout voltage performance?

A: The RT9030-25GU5 provides the lowest dropout voltage at 0.15V, followed by LD59015C25R at 0.21V. The original LP5951MG-2.5 and Texas Instruments equivalents specify 0.35V. Lower dropout voltage is advantageous in applications with limited input voltage headroom.

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