LP3990MF-2.5 Equivalent & Substitute Parts

Part Overview

The LP3990MF-2.5 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 2.5V output at 150mA in a SOT-23-5 surface mount package. This device is classified as "Not For New Designs," indicating it has been superseded in the product lifecycle. Finding equivalent and substitute parts is necessary for legacy system support, design continuity, and ensuring supply chain availability for existing applications requiring 2.5V regulation at 150mA output capacity.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	150mA
Input Voltage (Max)	6V
Dropout Voltage	0.2V @ 150mA
Quiescent Current	80 µA
Package Type	SOT-23-5
Operating Temperature Range	-40°C ~ 85°C
Control Features	Enable
Protection Features	Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution eligibility for the LP3990MF-2.5 is determined by the following critical parameters:

Primary Substitution Criteria:

Fixed output voltage of 2.5V
Output current capability of 150mA or greater
Maximum input voltage of 6V or higher
Surface mount package (SOT-23-5 or compatible pinout)
Operating temperature range covering -40°C to 85°C minimum
Enable control feature
Over temperature and short circuit protection

Substitution Categories:

Direct Equivalents (Identical Specifications): Parts meeting all primary criteria with matching electrical performance and package compatibility.

Higher Current Capacity Substitutes: Parts with 2.5V fixed output and current ratings exceeding 150mA, suitable for applications with margin requirements or future scaling.

Enhanced Performance Substitutes: Parts with improved specifications such as lower dropout voltage, better PSRR, or extended temperature range, while maintaining 2.5V output and minimum 150mA capacity.

Specialized Substitutes: Automotive-qualified or enhanced protection variants meeting the core electrical requirements.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage	Quiescent Current	Package	Temp Range	Product Status	RoHS Status
LP3990MF-2.5	Texas Instruments	2.5V	150mA	0.2V @ 150mA	80 µA	SOT-23-5	-40°C ~ 85°C	Not For New Designs	Non-compliant
LP3990MF-2.5/NOPB	Texas Instruments	2.5V	150mA	0.2V @ 150mA	80 µA	SOT-23-5	-40°C ~ 85°C	Active	ROHS3 Compliant
MIC5256-2.5YM5-TR	Microchip Technology	2.5V	150mA	0.25V @ 150mA	150 µA	SOT-23-5	-40°C ~ 125°C	Active	ROHS3 Compliant
MIC5317-2.5YD5-TR	Microchip Technology	2.5V	150mA	0.38V @ 150mA	39 µA	TSOT-23-5	-40°C ~ 125°C	Active	ROHS3 Compliant
BU25SD2MG-MTR	Rohm Semiconductor	2.5V	200mA	0.18V @ 100mA	80 µA	5-SSOP	-40°C ~ 105°C	Active	ROHS3 Compliant
AP7335-25WG-7	Diodes Incorporated	2.5V	300mA	0.2V @ 300mA	80 µA	SOT-25	-40°C ~ 85°C	Active	ROHS3 Compliant
AP7365-25WG-7	Diodes Incorporated	2.5V	600mA	0.4V @ 600mA	80 µA	SOT-25	-40°C ~ 85°C	Active	ROHS3 Compliant
MIC5232-2.5YD5-TR	Microchip Technology	2.5V	10mA	0.3V @ 10mA	3 µA	TSOT-23-5	-40°C ~ 125°C	Active	ROHS3 Compliant
MIC5318-2.5YD5-TR	Microchip Technology	2.5V	300mA	Not specified	150 µA	TSOT-23-5	-40°C ~ 125°C	Active	ROHS3 Compliant
NCP511SN25T1G	onsemi	2.5V	150mA	0.2V @ 100mA	40 µA	5-TSOP	-40°C ~ 85°C	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible, Identical Performance):

LP3990MF-2.5/NOPB is the primary direct substitute. This part maintains identical electrical specifications and package configuration while offering Active product status and ROHS3 compliance, addressing the legacy status of the original LP3990MF-2.5.

For Active Product Status with Extended Temperature Range:

MIC5256-2.5YM5-TR and MIC5317-2.5YD5-TR from Microchip Technology provide 2.5V fixed output at 150mA with extended operating temperature to 125°C. Both are Active products with ROHS3 compliance. MIC5317-2.5YD5-TR offers superior quiescent current performance (39 µA) and PSRR characteristics (80dB ~ 65dB at 1kHz ~ 10kHz).

For Higher Current Capacity:

AP7335-25WG-7 (300mA) and AP7365-25WG-7 (600mA) from Diodes Incorporated provide increased output current while maintaining 2.5V regulation and -40°C to 85°C operating range. These are suitable for applications requiring design margin or future current scaling.

For Automotive Applications:

BU25SD2MG-MTR from Rohm Semiconductor is AEC-Q100 qualified with extended temperature range (-40°C to 105°C), 200mA output capacity, and superior dropout voltage (0.18V @ 100mA). This part is recommended for automotive or industrial environments.

Not Recommended for Direct Substitution:

MIC5232-2.5YD5-TR is limited to 10mA output and is unsuitable for 150mA applications. NCP511SN25T1G is classified as Obsolete and should not be selected for new inventory or design continuity.

Frequently Asked Questions (FAQ)

Q: Can LP3990MF-2.5/NOPB be used as a direct replacement for LP3990MF-2.5?

A: Yes. LP3990MF-2.5/NOPB is electrically and mechanically identical, with the same 2.5V output, 150mA capacity, SOT-23-5 package, and -40°C to 85°C operating range. The primary advantage is Active product status and ROHS3 compliance versus the legacy status of the original part.

Q: What is the difference between SOT-23-5 and TSOT-23-5 packages?

A: Both are 5-pin surface mount packages with identical pinout and footprint. TSOT-23-5 denotes a thin variant with reduced height. Parts in either package are mechanically compatible on standard PCB layouts, though TSOT variants offer space savings in height-constrained applications.

Q: Can I use MIC5318-2.5YD5-TR (300mA) instead of LP3990MF-2.5 (150mA)?

A: Yes. MIC5318-2.5YD5-TR provides 2.5V fixed output with 300mA capacity, exceeding the 150mA requirement. This part is suitable for applications requiring higher current margin or future scaling. Verify quiescent current impact (150 µA versus 80 µA) in battery-powered designs.

Q: Is BU25SD2MG-MTR suitable for non-automotive applications?

A: Yes. While AEC-Q100 qualified for automotive use, BU25SD2MG-MTR meets all electrical requirements for general industrial and commercial applications. The extended temperature range (-40°C to 105°C) and superior dropout voltage (0.18V @ 100mA) provide performance benefits beyond automotive specifications.

Q: What is the impact of higher dropout voltage on system design?

A: Dropout voltage determines the minimum input voltage required to maintain regulated output. LP3990MF-2.5 requires 2.7V minimum input (2.5V output + 0.2V dropout). MIC5317-2.5YD5-TR requires 2.88V minimum (2.5V + 0.38V dropout). In low-input-voltage applications, lower dropout voltage parts (BU25SD2MG-MTR at 0.18V) provide greater design margin.

Q: Can I substitute a higher voltage output regulator (e.g., 3.3V) for a 2.5V application?

A: No. Output voltage is a fixed specification determined by internal reference and feedback networks. Substitution requires matching the 2.5V fixed output specification. NCP699SN33T1G, while listed in the original part's substitute list, outputs 3.3V and is not suitable for 2.5V applications.

Q: What does "Not For New Designs" mean for the original LP3990MF-2.5?

A: This designation indicates the part has been superseded and Texas Instruments does not recommend it for new product designs. Existing designs may continue using available inventory, but new designs should select from Active alternatives such as LP3990MF-2.5/NOPB or equivalent parts from other manufacturers.

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