LP5951MG-1.3 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP5951MG-1.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.3V output at 150mA in a 5-TSSOP (SC-70-5) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The regulator features integrated enable control, over-current protection, over-temperature protection, and short-circuit protection, with a maximum dropout voltage of 0.35V at 150mA and quiescent current of 55µA.

Substiute Parts

LP5951MG-1.3

Texas InstrumentsIn Stock: 2767LP5951MG-1.3 Datasheet

Current PartRFQ

LP5951MG-1.3/NOPB

Texas InstrumentsIn Stock: 2240LP5951MG-1.3/NOPB Datasheet

Parametric EquivalentRFQ

LP5951MGX-1.3/NOPB

Texas InstrumentsIn Stock: 4124LP5951MGX-1.3/NOPB Datasheet

Parametric EquivalentRFQ

MIC5365-1.3YC5-TR

Microchip TechnologyIn Stock: 10504MIC5365-1.3YC5-TR Datasheet

MFR RecommendedRFQ

RT9030-13GU5

Richtek USA Inc.In Stock: 2902RT9030-13GU5 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP5951MG-1.3 are qualified based on the following critical parameters:

• Fixed output voltage of 1.3V
• Output current capability of 150mA
• Maximum input voltage of 5.5V
• Identical or compatible package type (5-TSSOP, SC-70-5, SOT-353)
• Enable control feature
• Operating temperature range of -40°C to 125°C
• Surface mount mounting type

Parts are grouped into two categories: parametric equivalents from Texas Instruments (LP5951MG-1.3/NOPB and LP5951MGX-1.3/NOPB) and manufacturer-recommended alternatives from other suppliers (MIC5365-1.3YC5-TR from Microchip Technology and RT9030-13GU5 from Richtek USA Inc.).

Parameter Comparison

Engineering Selection Recommendations

For new designs and production continuity, the Texas Instruments parametric equivalents LP5951MG-1.3/NOPB and LP5951MGX-1.3/NOPB are the primary substitutes. Both are active products with ROHS3 compliance and identical electrical specifications to the obsolete LP5951MG-1.3, differing only in packaging format (Tape & Reel) and RoHS status.

The MIC5365-1.3YC5-TR from Microchip Technology is a manufacturer-recommended alternative with active product status and ROHS3 compliance. It maintains all critical electrical parameters with a slightly higher dropout voltage of 0.38V and lower quiescent current of 39µA, making it suitable for applications where lower standby power consumption is beneficial.

The RT9030-13GU5 from Richtek USA Inc. is also a manufacturer-recommended alternative with active product status and ROHS3 compliance. However, it has a reduced operating temperature range (-40°C to 85°C versus -40°C to 125°C) and higher moisture sensitivity level (MSL 3 versus MSL 1), which may limit its use in high-temperature or moisture-sensitive applications. The dropout voltage specification is not provided for this part.

All substitute parts share identical package types, output voltage, output current, and input voltage specifications, ensuring direct pin-compatible replacement in existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can LP5951MG-1.3/NOPB be used as a direct replacement for LP5951MG-1.3?

A: Yes. Both parts are Texas Instruments products with identical electrical specifications, output voltage, current rating, and package type. The primary difference is that LP5951MG-1.3/NOPB is an active product with ROHS3 compliance, while the original LP5951MG-1.3 is obsolete and RoHS non-compliant.

Q: What is the difference between LP5951MG-1.3/NOPB and LP5951MGX-1.3/NOPB?

A: Both are parametric equivalents from Texas Instruments with identical electrical specifications. The difference lies in the device marking and internal construction (indicated by the "X" designation), but they are functionally equivalent for circuit design purposes.

Q: Can MIC5365-1.3YC5-TR replace LP5951MG-1.3 in all applications?

A: MIC5365-1.3YC5-TR is a functional substitute with the same output voltage, current rating, and package type. The dropout voltage is slightly higher (0.38V versus 0.35V), and quiescent current is lower (39µA versus 55µA). Applications requiring the exact 0.35V dropout specification should be evaluated for compatibility.

Q: Is RT9030-13GU5 suitable for high-temperature applications?

A: RT9030-13GU5 has a maximum operating temperature of 85°C, which is lower than the original LP5951MG-1.3 specification of 125°C. It is not suitable for applications requiring operation above 85°C.

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

A: Yes. All substitute parts use the 5-TSSOP (SC-70-5, SOT-353) surface mount package, ensuring pin-compatible replacement without PCB redesign.

Q: What is the moisture sensitivity consideration for RT9030-13GU5?

A: RT9030-13GU5 has MSL 3 (168 Hours) compared to MSL 1 (Unlimited) for other alternatives. This requires stricter moisture control during storage and handling, with a maximum floor life of 168 hours after bag opening under specified humidity conditions.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts (LP5951MG-1.3/NOPB, LP5951MGX-1.3/NOPB, MIC5365-1.3YC5-TR, and RT9030-13GU5) are ROHS3 compliant, whereas the original LP5951MG-1.3 is RoHS non-compliant.