LP2992AIM5-1.5 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2992AIM5-1.5 is a micropower linear voltage regulator IC from Texas Instruments, designed to deliver a fixed 1.5V output at 250mA in a surface-mount SOT-23-5 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The regulator integrates enable control, over-current protection, over-temperature protection, and short-circuit protection, suitable for low-noise applications requiring stable 1.5V regulation from input sources up to 16V.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP2992AIM5-1.5
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.5V
Output Current	250mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.85V @ 250mA
Quiescent Current	95 µA
PSRR	45dB (1kHz)
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LP2992AIM5-1.5 are classified based on strict parametric equivalence. The primary substitution criteria are:

Critical Parameters for Substitution:

Output voltage: 1.5V fixed
Output current capability: 250mA minimum
Input voltage range: up to 16V maximum
Package type: SOT-23-5 (SC-74A, SOT-753)
Operating temperature range: -40°C ~ 125°C
Control features: Enable function
Protection: Over-current, over-temperature, short-circuit

Substitute Categories:

Parametric Equivalents (Direct Replacements): LP2992AIM5-1.5/NOPB, LP2992AIM5X-1.5/NOPB, LP2992IM5-1.5/NOPB, LP2992IM5X-1.5/NOPB. These parts maintain identical electrical specifications and package configuration, differing only in product status, packaging format (bulk vs. cut tape), or manufacturing variant designations.

Manufacturer-Recommended Substitute (Enhanced Capability): SPX3819M5-L-1-5/TR from MaxLinear, Inc. This part exceeds the output current specification (500mA vs. 250mA) while maintaining the same 1.5V output voltage, SOT-23-5 package, and operating temperature range. The lower quiescent current (8 µA vs. 95 µA) and higher supply current rating (30 mA vs. 4 mA) represent design improvements suitable for applications requiring lower standby power consumption.

Parameter Comparison

Parameter	LP2992AIM5-1.5	LP2992AIM5-1.5/NOPB	LP2992AIM5X-1.5/NOPB	LP2992IM5-1.5/NOPB	LP2992IM5X-1.5/NOPB	SPX3819M5-L-1-5/TR
Manufacturer	Texas Instruments	National Semiconductor	National Semiconductor	Texas Instruments	Texas Instruments	MaxLinear, Inc.
Output Voltage	1.5V	1.5V	1.5V	1.5V	1.5V	1.5V
Output Current	250mA	250mA	250mA	250mA	250mA	500mA
Input Voltage (Max)	16V	16V	16V	16V	16V	16V
Dropout Voltage (Max)	0.85V @ 250mA	0.85V @ 250mA	0.85V @ 250mA	0.85V @ 250mA	0.85V @ 250mA	Not specified
Quiescent Current	95 µA	95 µA	95 µA	95 µA	95 µA	8 µA
PSRR	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	Not specified
Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Product Status	Obsolete	Active	Active	Obsolete	Last Time Buy	Active
RoHS Status	Non-compliant	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

For Direct Parametric Replacement:

Select LP2992AIM5-1.5/NOPB or LP2992AIM5X-1.5/NOPB when active product status and current availability are required. Both National Semiconductor variants maintain full electrical and mechanical compatibility with the original LP2992AIM5-1.5. LP2992AIM5-1.5/NOPB is available in bulk packaging, while LP2992AIM5X-1.5/NOPB is supplied in cut tape format. Both are active products with unrestricted availability.

LP2992IM5-1.5/NOPB and LP2992IM5X-1.5/NOPB from Texas Instruments provide parametric equivalence but carry obsolete or last-time-buy status designations. LP2992IM5-1.5/NOPB is obsolete; LP2992IM5X-1.5/NOPB is designated last-time-buy. Both include RoHS3 compliance certification. These options are suitable only when existing inventory is available and long-term supply is not required.

For Enhanced Performance:

SPX3819M5-L-1-5/TR from MaxLinear, Inc. is the manufacturer-recommended substitute offering superior output current capability (500mA vs. 250mA) and significantly lower quiescent current (8 µA vs. 95 µA). This part is active, RoHS compliant, and available in high volume (22,900 pcs in stock). Selection of this part is appropriate for applications where increased current headroom or reduced standby power consumption provides design benefits. The identical SOT-23-5 package and 1.5V output voltage ensure direct board-level compatibility.

Frequently Asked Questions (FAQ)

Q: Can LP2992AIM5-1.5/NOPB be used as a direct replacement for LP2992AIM5-1.5?

A: Yes. LP2992AIM5-1.5/NOPB is a parametric equivalent with identical electrical specifications, output voltage (1.5V), output current (250mA), input voltage range (16V max), dropout voltage (0.85V @ 250mA), quiescent current (95 µA), PSRR (45dB @ 1kHz), and SOT-23-5 package configuration. The primary difference is product status: LP2992AIM5-1.5/NOPB is active, while the original is obsolete.

Q: What is the difference between LP2992AIM5X-1.5/NOPB and LP2992AIM5-1.5/NOPB?

A: Both parts are parametric equivalents from National Semiconductor with identical electrical specifications and SOT-23-5 packaging. The "X" designation in LP2992AIM5X-1.5/NOPB indicates a manufacturing variant. Both maintain 1.5V output, 250mA current, and full protection features. Selection between them depends on packaging preference and availability.

Q: Why is SPX3819M5-L-1-5/TR listed as a substitute if it has 500mA output instead of 250mA?

A: SPX3819M5-L-1-5/TR is classified as a manufacturer-recommended substitute because it exceeds the minimum electrical requirements while maintaining the same output voltage (1.5V), package type (SOT-23-5), and operating temperature range (-40°C ~ 125°C). The higher current capability (500mA) is a design enhancement that does not compromise compatibility; circuits designed for 250mA operation function correctly with a 500mA-capable regulator. The lower quiescent current (8 µA vs. 95 µA) provides additional power efficiency benefits.

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

A: Yes. All listed substitute parts use the SOT-23-5 package (SC-74A, SOT-753 case designation). This ensures identical board-level footprint and pin configuration, enabling direct socket replacement without PCB modifications.

Q: What is the significance of product status (Active, Obsolete, Last Time Buy)?

A: Product status indicates supply availability and manufacturer support. Active products have unrestricted availability and ongoing manufacturing. Obsolete products are no longer manufactured; existing inventory only. Last Time Buy indicates the final production run before discontinuation. For new designs or long-term production, select active products: LP2992AIM5-1.5/NOPB, LP2992AIM5X-1.5/NOPB, or SPX3819M5-L-1-5/TR.

Q: Do all substitute parts include the same protection features?

A: LP2992AIM5-1.5/NOPB, LP2992AIM5X-1.5/NOPB, LP2992IM5-1.5/NOPB, and LP2992IM5X-1.5/NOPB include over-current, over-temperature, and short-circuit protection. SPX3819M5-L-1-5/TR includes over-current, over-temperature, and reverse-polarity protection. All parts provide comprehensive protection suitable for the specified operating conditions.

Q: Which substitute part should be selected for RoHS compliance?

A: LP2992IM5-1.5/NOPB, LP2992IM5X-1.5/NOPB, and SPX3819M5-L-1-5/TR are RoHS compliant. The original LP2992AIM5-1.5 is RoHS non-compliant. For applications requiring RoHS certification, select from the compliant alternatives.

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