LP3988IMF-2.5 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3988IMF-2.5 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 2.5V output applications with 150mA current capability in a compact SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. 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 eligibility for the LP3988IMF-2.5 is determined by the following critical parameters:

Fixed output voltage of 2.5V
Minimum 150mA output current capability
Maximum input voltage of 6V or greater
SOT-23-5 package compatibility
Positive output configuration
Single regulator output

Parts meeting these core electrical and mechanical specifications are classified as parametric equivalents or manufacturer-recommended substitutes. Variations in secondary parameters such as quiescent current, PSRR, or specific protection feature sets do not disqualify substitution when primary specifications are met.

Parameter Comparison

Parameter	LP3988IMF-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
Product Status	Obsolete	Active	Active	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C

Engineering Selection Recommendations

LP3988IMF-2.5/NOPB (Texas Instruments) is the direct parametric equivalent with identical electrical specifications and the same manufacturer lineage. This part is active and ROHS3 compliant, making it the preferred choice for new designs and direct replacement applications. The /NOPB designation indicates lead-free processing.

LP3988IMFX-2.5/NOPB (National Semiconductor) provides equivalent functionality with matching core specifications. As an active product, it offers procurement continuity. Note that National Semiconductor is now part of Texas Instruments, ensuring design support consistency.

MIC5256-2.5YM5-TR (Microchip Technology) is a manufacturer-recommended substitute meeting all primary electrical and mechanical requirements. This part exhibits slightly higher voltage dropout (0.25V versus 0.15V) and quiescent current (150 µA versus 120 µA), which may impact efficiency in power-sensitive applications. The MIC5256 is ROHS3 compliant and widely available. Selection of this part should account for the increased dropout voltage in applications with tight input voltage margins.

For new designs, prioritize active products with current RoHS compliance. For legacy system support where the original LP3988IMF-2.5 is obsolete, LP3988IMF-2.5/NOPB provides the most direct replacement path.

Frequently Asked Questions (FAQ)

Q: Can LP3988IMF-2.5/NOPB directly replace LP3988IMF-2.5 in existing designs?

A: Yes. Both parts share identical electrical specifications, output voltage, current rating, and SOT-23-5 packaging. The primary difference is product status (active versus obsolete) and RoHS compliance level. Pin-for-pin compatibility is maintained.

Q: What is the significance of the /NOPB suffix?

A: The /NOPB designation indicates the part is manufactured without lead (Pb) and meets RoHS3 compliance requirements. This is standard for current production parts and does not affect electrical performance or pin compatibility.

Q: Is MIC5256-2.5YM5-TR suitable for applications with tight input voltage margins?

A: The MIC5256 exhibits 0.25V maximum dropout versus 0.15V for the LP3988 series. In applications where input voltage approaches the minimum operating threshold, the higher dropout may result in insufficient output regulation. Verify input voltage headroom before substitution.

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

A: Yes. All listed substitutes use SOT-23-5 (SC-74A) surface mount packaging, ensuring PCB layout compatibility and no redesign requirements.

Q: What compliance certifications should be verified for new procurement?

A: Confirm ROHS3 compliance and REACH unaffected status for all parts. The original LP3988IMF-2.5 is RoHS non-compliant; active substitutes (LP3988IMF-2.5/NOPB and MIC5256-2.5YM5-TR) meet current environmental regulations.

Q: Can these parts be used interchangeably in production?

A: LP3988IMF-2.5/NOPB and LP3988IMFX-2.5/NOPB are direct parametric equivalents and fully interchangeable. MIC5256-2.5YM5-TR is functionally equivalent but requires verification of dropout voltage performance in the specific application circuit before qualification.

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