LP2992IM5X-3.3 Equivalent & Substitute Parts

Part Overview

The LP2992IM5X-3.3 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3.3V output at 250mA in a SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device provides positive fixed output regulation with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for low-power applications requiring stable 3.3V rails.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	250mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.85V @ 250mA
Quiescent Current	95 µA
Package Type	SOT-23-5 (SC-74A)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP2992IM5X-3.3 is determined by the following critical parameters:

Output Voltage: Must be fixed at 3.3V
Package: Must be SOT-23-5 (SC-74A) for mechanical and electrical compatibility
Output Current Capability: Minimum 250mA required for direct replacement; higher ratings acceptable
Input Voltage Range: Maximum input voltage must support 16V operation
Operating Temperature: Must support -40°C to 125°C range
Protection Features: Over-current and over-temperature protection required

Substitute parts are grouped into two categories:

Parametric Equivalents (LP2992 series variants from Texas Instruments): These parts maintain identical electrical specifications and are direct replacements with improved product status (Active vs. Obsolete) and RoHS3 compliance.

Manufacturer Recommended Alternatives (from Diodes Incorporated, STMicroelectronics, and MaxLinear): These parts meet or exceed the core electrical requirements while offering different performance characteristics in specific parameters such as dropout voltage, quiescent current, or output current capability.

Parameter Comparison

Part Number	Manufacturer	Output Current	Dropout Voltage	Quiescent Current	Input Voltage (Max)	Product Status	RoHS Status	Packaging
LP2992IM5X-3.3	Texas Instruments	250mA	0.85V @ 250mA	95 µA	16V	Obsolete	Non-compliant	Tape & Reel
LP2992AIM5-3.3/NOPB	Texas Instruments	250mA	0.85V @ 250mA	95 µA	16V	Active	ROHS3 Compliant	Cut Tape & Digi-Reel
LP2992AIM5X-3.3/NOPB	Texas Instruments	250mA	0.85V @ 250mA	95 µA	16V	Active	ROHS3 Compliant	Cut Tape & Digi-Reel
LP2992IM5-3.3/NOPB	Texas Instruments	250mA	0.85V @ 250mA	95 µA	16V	Active	ROHS3 Compliant	Cut Tape & Digi-Reel
LP2992IM5X-3.3/NOPB	Texas Instruments	250mA	0.85V @ 250mA	95 µA	16V	Active	ROHS3 Compliant	Tape & Reel
AP2210K-3.3TRE1	Diodes Incorporated	300mA	0.5V @ 300mA	180 µA	13.2V	Active	ROHS3 Compliant	Tape & Reel
AP2210K-3.3TRG1	Diodes Incorporated	300mA	0.5V @ 300mA	180 µA	13.2V	Active	ROHS3 Compliant	Cut Tape & Digi-Reel
LD2985BM33R	STMicroelectronics	150mA	0.575V @ 150mA	150 µA	16V	Active	ROHS3 Compliant	Cut Tape & Digi-Reel
SPX3819M5-L-3-3/TR	MaxLinear, Inc.	500mA	0.7V @ 500mA	8 µA	16V	Active	ROHS3 Compliant	Cut Tape & Digi-Reel
SPX5205M5-L-3-3/TR	MaxLinear, Inc.	150mA	0.35V @ 150mA	5 µA	16V	Active	RoHS Compliant	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents)

The LP2992 series variants from Texas Instruments—LP2992AIM5-3.3/NOPB, LP2992AIM5X-3.3/NOPB, LP2992IM5-3.3/NOPB, and LP2992IM5X-3.3/NOPB—are the primary substitutes. All maintain identical electrical specifications (250mA output, 0.85V dropout, 95 µA quiescent current) and support the full -40°C to 125°C operating range. These parts carry Active product status and ROHS3 compliance, addressing the obsolescence of the original part. Selection among these variants depends on packaging preference: Cut Tape & Digi-Reel for standard procurement or Tape & Reel for high-volume production.

Alternative Substitutes with Enhanced Performance

When design requirements permit higher output current capability, the AP2210K series from Diodes Incorporated (300mA output) and SPX3819M5-L-3-3/TR from MaxLinear (500mA output) provide increased current headroom. The AP2210K offers improved dropout voltage (0.5V) but operates at a reduced maximum input voltage (13.2V). The SPX3819M5-L-3-3/TR delivers significantly lower quiescent current (8 µA) and higher output current (500mA), beneficial for battery-powered or low-power applications.

Current-Limited Alternatives

The LD2985BM33R from STMicroelectronics and SPX5205M5-L-3-3/TR from MaxLinear are suitable only for applications requiring 150mA or less. The SPX5205M5-L-3-3/TR offers exceptional dropout voltage (0.35V) and minimal quiescent current (5 µA), making it optimal for power-constrained designs within its current rating.

All recommended substitutes maintain SOT-23-5 packaging, -40°C to 125°C operating temperature range, and required protection features. Selection should be based on specific application current requirements and input voltage constraints.

Frequently Asked Questions (FAQ)

Q: Can I use LP2992AIM5-3.3/NOPB as a direct replacement for LP2992IM5X-3.3?

A: Yes. Both parts deliver identical electrical specifications: 3.3V fixed output, 250mA current, 0.85V dropout voltage, and 95 µA quiescent current. The primary difference is product status (Active vs. Obsolete) and RoHS compliance. The LP2992AIM5-3.3/NOPB is available in Cut Tape & Digi-Reel packaging, while the original uses Tape & Reel.

Q: What is the difference between LP2992IM5X-3.3/NOPB and LP2992IM5-3.3/NOPB?

A: Both are parametric equivalents with identical electrical performance. The difference lies in packaging format: LP2992IM5X-3.3/NOPB is supplied in Tape & Reel, while LP2992IM5-3.3/NOPB is available in Cut Tape & Digi-Reel. Selection depends on procurement and assembly requirements.

Q: Can I substitute the AP2210K-3.3TRE1 for the LP2992IM5X-3.3 in all applications?

A: The AP2210K-3.3TRE1 is compatible for applications requiring up to 300mA output current. However, its maximum input voltage is 13.2V compared to the LP2992's 16V. Verify your input voltage does not exceed 13.2V before substitution. The AP2210K also exhibits higher quiescent current (180 µA vs. 95 µA).

Q: Why would I choose SPX3819M5-L-3-3/TR over the LP2992 equivalents?

A: The SPX3819M5-L-3-3/TR provides 500mA output current (double the LP2992) and exceptionally low quiescent current (8 µA). This makes it suitable for applications requiring higher current delivery or operating from battery supplies where quiescent current minimization is critical. It maintains the same 16V maximum input voltage and -40°C to 125°C temperature range.

Q: Is the SPX5205M5-L-3-3/TR suitable as a replacement for the LP2992IM5X-3.3?

A: The SPX5205M5-L-3-3/TR is suitable only if your application requires 150mA or less. It offers superior dropout voltage (0.35V) and minimal quiescent current (5 µA), but its 150mA rating is below the LP2992's 250mA specification. Operating temperature range is also reduced to -40°C to 85°C.

Q: Do all substitute parts use the same SOT-23-5 package?

A: Yes. All listed substitute parts use the SOT-23-5 (SC-74A) package, ensuring mechanical and electrical compatibility with the original LP2992IM5X-3.3 footprint.

Q: What is the significance of RoHS3 compliance for these parts?

A: RoHS3 compliance indicates the part meets current environmental and hazardous substance restrictions. The original LP2992IM5X-3.3 is RoHS non-compliant (obsolete status). All active substitute parts carry ROHS3 or RoHS compliance, making them suitable for modern manufacturing and regulatory requirements.

Q: Can I use LD2985BM33R as a drop-in replacement?

A: The LD2985BM33R is compatible only for applications requiring 150mA or less output current. Its 150mA rating is insufficient for designs expecting the full 250mA capability of the LP2992. Verify your actual current requirements before substitution.

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