LP3988IMF-3.3 Equivalent & Substitute Parts

Part Overview

The LP3988IMF-3.3 is a linear voltage regulator IC from Texas Instruments designed to deliver a fixed 3.3V output at 150mA in a compact SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device integrates enable and power good control features with over-temperature and short-circuit protection, suitable for low-power applications requiring stable 3.3V regulation.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
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-3.3 is determined by the following critical parameters:

Fixed output voltage of 3.3V
Output current capability of 150mA minimum
Maximum input voltage of 6V or greater
SOT-23-5 package compatibility
Operating temperature range of -40°C to 125°C
Surface mount mounting type

Substitute parts must maintain these core electrical and mechanical specifications to ensure functional compatibility in existing circuit designs. Variations in dropout voltage, quiescent current, PSRR, and control feature sets are permitted provided the primary output characteristics and package form factor remain consistent.

Parameter Comparison

Parameter	LP3988IMF-3.3	LP3988IMF-3.3/NOPB	LP3988IMFX-3.3/NOPB	MIC5256-3.3YM5-TR	TC1186-3.3VCT713
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Microchip Technology	Microchip Technology
Output Voltage	3.3V	3.3V	3.3V	3.3V	3.3V
Output Current	150mA	150mA	150mA	150mA	150mA
Input Voltage (Max)	6V	6V	6V	6V	6.5V
Voltage Dropout (Max)	0.15V @ 150mA	0.15V @ 150mA	0.15V @ 150mA	0.25V @ 150mA	0.4V @ 150mA
Quiescent Current	120 µA	120 µA	120 µA	150 µA	80 µA
Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C

Engineering Selection Recommendations

LP3988IMF-3.3/NOPB and LP3988IMFX-3.3/NOPB are parametric equivalents from Texas Instruments with identical electrical specifications to the obsolete LP3988IMF-3.3. Both are active products with ROHS3 compliance. Selection between these two depends on packaging requirements: LP3988IMF-3.3/NOPB is supplied in Cut Tape and Digi-Reel format, while LP3988IMFX-3.3/NOPB is supplied in Tape & Reel format.

MIC5256-3.3YM5-TR from Microchip Technology is a functional substitute with identical output voltage, current, and package specifications. This device exhibits higher dropout voltage (0.25V vs 0.15V) and quiescent current (150 µA vs 120 µA) but remains suitable for applications where these variations are acceptable. ROHS3 compliance and active product status support its use in new designs.

TC1186-3.3VCT713 from Microchip Technology is a functional substitute with the highest maximum input voltage (6.5V) and lowest quiescent current (80 µA) among the alternatives. Dropout voltage is higher at 0.4V @ 150mA. ROHS3 compliance and active product status make this suitable for designs prioritizing low quiescent current or requiring extended input voltage range.

Frequently Asked Questions (FAQ)

Q: Can LP3988IMF-3.3/NOPB directly replace the obsolete LP3988IMF-3.3?

A: Yes. LP3988IMF-3.3/NOPB is a parametric equivalent with identical electrical specifications and SOT-23-5 package. The primary difference is product status (active vs obsolete) and RoHS compliance (ROHS3 vs non-compliant). Packaging format differs: NOPB variant uses Cut Tape and Digi-Reel.

Q: What are the key differences between the two Texas Instruments variants?

A: LP3988IMF-3.3/NOPB and LP3988IMFX-3.3/NOPB have identical electrical specifications. The difference is packaging: NOPB uses Cut Tape and Digi-Reel format, while IMFX uses Tape & Reel format. Select based on your procurement and assembly requirements.

Q: Can Microchip Technology parts substitute for Texas Instruments LP3988IMF-3.3?

A: Yes, both MIC5256-3.3YM5-TR and TC1186-3.3VCT713 are functional substitutes. All three maintain 3.3V output, 150mA current, SOT-23-5 package, and -40°C to 125°C operating range. Differences in dropout voltage and quiescent current must be evaluated against your circuit requirements.

Q: Which substitute has the best dropout voltage performance?

A: LP3988IMF-3.3/NOPB and LP3988IMFX-3.3/NOPB both offer 0.15V dropout at 150mA, matching the original part. MIC5256-3.3YM5-TR has 0.25V dropout, and TC1186-3.3VCT713 has 0.4V dropout. For applications sensitive to dropout voltage, the Texas Instruments variants are preferred.

Q: Which substitute has the lowest quiescent current?

A: TC1186-3.3VCT713 has the lowest quiescent current at 80 µA, compared to 120 µA for the original LP3988IMF-3.3 and Texas Instruments substitutes, and 150 µA for MIC5256-3.3YM5-TR. This makes TC1186 suitable for battery-powered or low-power standby applications.

Q: Are all substitutes RoHS compliant?

A: The original LP3988IMF-3.3 is RoHS non-compliant. All substitute parts (LP3988IMF-3.3/NOPB, LP3988IMFX-3.3/NOPB, MIC5256-3.3YM5-TR, and TC1186-3.3VCT713) are ROHS3 compliant, meeting current environmental regulations.

Q: Can I use these parts interchangeably in my PCB design?

A: Yes, all parts use the same SOT-23-5 package and pin configuration. PCB layout and footprint remain unchanged. Verify that your circuit design tolerates the electrical parameter variations (dropout voltage, quiescent current, PSRR) of your selected substitute.

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