LP3988IMFX-2.5 Equivalent & Substitute Parts

Part Overview

The LP3988IMFX-2.5 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 2.5V output at 150mA in a SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device provides regulated power management with integrated enable and power good control features, suitable for low-power applications requiring stable 2.5V rails.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	150mA
Input Voltage (Max)	6V
Voltage Dropout (Max)	0.15V @ 150mA
Quiescent Current	120 µA
Package	SOT-23-5 (SC-74A)
Control Features	Enable, Power Good
Protection Features	Over Temperature, Short Circuit
Operating Temperature Range	-40°C to 125°C

Substitute Part Grouping Explanation

Substitution for the LP3988IMFX-2.5 is determined by the following critical parameters:

Fixed output voltage of 2.5V
Output current capability of 150mA minimum
Maximum input voltage of 6V
SOT-23-5 package compatibility
Operating temperature range of -40°C to 125°C
Surface mount mounting type

Parts meeting all these electrical and mechanical specifications are classified as parametric equivalents or manufacturer-recommended substitutes. Variations in quiescent current, dropout voltage, PSRR, or protection feature sets do not disqualify a part from substitution provided the core parameters remain within specification.

Parameter Comparison

Parameter	LP3988IMFX-2.5	LP3988IMF-2.5/NOPB	LP3988IMFX-2.5/NOPB	MIC5256-2.5YM5-TR
Manufacturer	Texas Instruments	Texas Instruments	National Semiconductor	Microchip Technology
Output Voltage	2.5V	2.5V	2.5V	2.5V
Output Current	150mA	150mA	150mA	150mA
Input Voltage (Max)	6V	6V	6V	6V
Voltage Dropout (Max)	0.15V @ 150mA	0.15V @ 150mA	0.15V @ 150mA	0.25V @ 150mA
Quiescent Current	120 µA	120 µA	120 µA	150 µA
Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
Control Features	Enable, Power Good	Enable, Power Good	Enable, Power Good	Enable
Protection Features	Over Temperature, Short Circuit	Over Temperature, Short Circuit	Over Temperature, Short Circuit	Over Current, Over Temperature, UVLO
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Product Status	Obsolete	Active	Active	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

LP3988IMF-2.5/NOPB (Texas Instruments) is the primary parametric equivalent. This part maintains identical electrical specifications to the main part, including 0.15V dropout voltage and 120 µA quiescent current. It is active in production status and ROHS3 compliant, making it the preferred choice for new designs and ongoing procurement.

LP3988IMFX-2.5/NOPB (National Semiconductor) is a secondary parametric equivalent with matching electrical performance. Product status is listed as active, providing supply continuity.

MIC5256-2.5YM5-TR (Microchip Technology) is a manufacturer-recommended substitute with active production status and ROHS3 compliance. This part exhibits higher dropout voltage (0.25V vs. 0.15V) and quiescent current (150 µA vs. 120 µA), along with different protection features (Over Current and UVLO instead of Short Circuit). These differences are within acceptable substitution parameters for applications where the core 2.5V, 150mA specification is met. The absence of Power Good output should be evaluated against circuit requirements.

For new designs, prioritize active production parts with current compliance certifications. For legacy system maintenance, any of the three substitutes maintain functional compatibility within the specified electrical and mechanical parameters.

Frequently Asked Questions (FAQ)

Q: Can LP3988IMF-2.5/NOPB directly replace LP3988IMFX-2.5?

A: Yes. Both parts are Texas Instruments linear regulators with identical output voltage (2.5V), output current (150mA), dropout voltage (0.15V @ 150mA), quiescent current (120 µA), package (SOT-23-5), and control/protection features. The primary difference is product status: the original is obsolete while the substitute is active in production.

Q: What are the key differences between the Texas Instruments and Microchip substitutes?

A: The MIC5256-2.5YM5-TR differs in three areas: dropout voltage is 0.25V versus 0.15V, quiescent current is 150 µA versus 120 µA, and control features differ (Enable only versus Enable and Power Good). Protection features also differ, with the Microchip part including Over Current and UVLO protection. All parts maintain the 2.5V output, 150mA current, and SOT-23-5 package.

Q: Are all substitutes available in the same package?

A: Yes. All listed substitutes use the SOT-23-5 package (SC-74A, SOT-753), ensuring mechanical and pin compatibility for direct board-level replacement.

Q: Which substitute should be selected for new designs?

A: LP3988IMF-2.5/NOPB is recommended for new designs. It maintains full electrical equivalence to the original part and carries active production status with ROHS3 compliance.

Q: Does the absence of Power Good output on the MIC5256-2.5YM5-TR affect substitution?

A: The MIC5256-2.5YM5-TR lacks the Power Good output present on the LP3988 series. If Power Good monitoring is required by the circuit design, this part is not suitable. Verify circuit requirements before selection.

Q: Are there packaging format differences among the substitutes?

A: Yes. LP3988IMFX-2.5 is supplied in bulk packaging, LP3988IMF-2.5/NOPB is available in Cut Tape and Digi-Reel formats, and MIC5256-2.5YM5-TR is supplied in Tape & Reel. Confirm packaging requirements with procurement specifications.

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