LP2992AIM5-1.8 Equivalent & Substitute Parts

Part Overview

The LP2992AIM5-1.8 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output at 250mA in SOT-23-5 surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device provides regulated 1.8V output with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for low-power applications requiring stable voltage regulation.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP2992AIM5-1.8
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.8V
Output Current	250mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.85V @ 250mA
Quiescent Current	95 µA
Package / Case	SC-74A, SOT-753 (SOT-23-5)
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LP2992AIM5-1.8 are classified based on strict electrical and mechanical parameter compatibility:

Parametric Equivalents maintain identical electrical specifications: 1.8V fixed output, 250mA output current, 16V maximum input voltage, SOT-23-5 package, and -40°C to 125°C operating temperature range. These parts differ only in product status (active vs. obsolete) and packaging format (Cut Tape vs. Tape & Reel).

Manufacturer Recommended Substitutes are approved alternatives that share the core electrical characteristics (1.8V output, SOT-23-5 package, 16V input maximum, -40°C to 125°C operation) but differ in output current capacity or quiescent current specifications. These parts are selected based on functional compatibility within the allowed parameter tolerance for this product category.

Key parameters determining substitution eligibility:

Output voltage: 1.8V (fixed)
Package type: SOT-23-5 (SC-74A, SOT-753)
Input voltage rating: 16V maximum
Operating temperature range: -40°C to 125°C minimum
Output configuration: Positive, fixed output

Parameter Comparison

Part Number	Manufacturer	Output Current	Dropout Voltage	Quiescent Current	Product Status	RoHS Status	Packaging
LP2992AIM5-1.8	Texas Instruments	250mA	0.85V @ 250mA	95 µA	Obsolete	RoHS non-compliant	Cut Tape (CT) & Digi-Reel®
LP2992AIM5-1.8/NOPB	Texas Instruments	250mA	0.85V @ 250mA	95 µA	Active	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
LP2992IM5-1.8/NOPB	Texas Instruments	250mA	0.85V @ 250mA	95 µA	Active	ROHS3 Compliant	Tape & Reel (TR)
LP2992IM5X-1.8/NOPB	Texas Instruments	250mA	0.85V @ 250mA	95 µA	Active	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
LD2985BM18R	STMicroelectronics	150mA	0.575V @ 150mA	150 µA	Active	ROHS3 Compliant	Tape & Reel (TR)
SPX3819M5-L-1-8/TR	MaxLinear, Inc.	500mA	Not specified	8 µA	Active	RoHS Compliant	Tape & Reel (TR)
SPX5205M5-L-1-8/TR	MaxLinear, Inc.	150mA	Not specified	5 µA	Active	RoHS Compliant	Tape & Reel (TR)

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents): LP2992AIM5-1.8/NOPB, LP2992IM5-1.8/NOPB, and LP2992IM5X-1.8/NOPB are direct electrical equivalents with identical 250mA output current and 0.85V dropout voltage specifications. All three are active products with ROHS3 compliance, addressing the obsolete status of the original part. Selection between these three depends on packaging requirements: Cut Tape & Digi-Reel® format or Tape & Reel format.

Functional Alternatives (Manufacturer Recommended): LD2985BM18R (STMicroelectronics), SPX3819M5-L-1-8/TR (MaxLinear), and SPX5205M5-L-1-8/TR (MaxLinear) are approved substitutes sharing the 1.8V output voltage, SOT-23-5 package, and -40°C to 125°C operating range. These parts differ in output current capacity and are suitable for applications where the original 250mA specification can be adjusted:

LD2985BM18R: 150mA output (reduced capacity, lower dropout voltage)
SPX3819M5-L-1-8/TR: 500mA output (increased capacity, ultra-low quiescent current)
SPX5205M5-L-1-8/TR: 150mA output (reduced capacity, ultra-low quiescent current)

All substitute parts are active products with current RoHS compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can I use LP2992IM5-1.8/NOPB as a direct replacement for LP2992AIM5-1.8?

A: Yes. Both parts have identical electrical specifications: 250mA output current, 1.8V fixed output, 0.85V dropout voltage, and SOT-23-5 packaging. The primary difference is packaging format (Tape & Reel vs. Cut Tape & Digi-Reel®) and product status (active vs. obsolete). LP2992IM5-1.8/NOPB is ROHS3 compliant, addressing compliance requirements of the obsolete original part.

Q: What is the difference between the three Texas Instruments LP2992 variants?

A: LP2992AIM5-1.8/NOPB, LP2992IM5-1.8/NOPB, and LP2992IM5X-1.8/NOPB are electrically identical with 250mA output current and 0.85V dropout voltage. Differences are in packaging format and inventory availability. All three are active products with ROHS3 compliance.

Q: Can I use SPX3819M5-L-1-8/TR (500mA) instead of the 250mA LP2992AIM5-1.8?

A: SPX3819M5-L-1-8/TR is a manufacturer-recommended substitute with 1.8V output and SOT-23-5 packaging. The higher 500mA output current rating makes it suitable for applications requiring greater current capacity. However, verify that your circuit design accommodates the different quiescent current (8 µA vs. 95 µA) and any other performance characteristics specific to your application.

Q: What are the advantages of using SPX5205M5-L-1-8/TR over the original LP2992AIM5-1.8?

A: SPX5205M5-L-1-8/TR provides ultra-low quiescent current (5 µA vs. 95 µA), beneficial for battery-powered or low-power standby applications. Output current is reduced to 150mA. The part is active with RoHS compliance. Operating temperature range is -40°C to 85°C, which is narrower than the original -40°C to 125°C specification.

Q: Are all substitute parts available in SOT-23-5 packaging?

A: Yes. All listed substitute parts use SC-74A or SOT-753 package designations, which are equivalent to SOT-23-5. This ensures mechanical and electrical compatibility with the original LP2992AIM5-1.8 footprint.

Q: Which substitute should I choose if I need the lowest quiescent current?

A: SPX3819M5-L-1-8/TR and SPX5205M5-L-1-8/TR both offer significantly lower quiescent current (8 µA and 5 µA respectively) compared to the original 95 µA specification. SPX5205M5-L-1-8/TR has the lowest quiescent current but is limited to 150mA output. SPX3819M5-L-1-8/TR provides 500mA output with 8 µA quiescent current.

Q: Is the LD2985BM18R a suitable replacement for all applications using LP2992AIM5-1.8?

A: LD2985BM18R is a manufacturer-recommended substitute with 1.8V output and SOT-23-5 packaging. Output current is reduced to 150mA, and dropout voltage is lower (0.575V @ 150mA). This part is suitable only for applications where 150mA output current is sufficient. Verify your circuit requirements before substitution.

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