LP2986AIMX-3.3 Equivalent & Substitute Parts

Part Overview

The LP2986AIMX-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output at 200mA. This 8-SOIC surface mount device provides micropower regulation with integrated protection features including over-current, over-temperature, and short-circuit protection. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	200mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.35V @ 200mA
Quiescent Current	120 µA
Package	8-SOIC (0.154", 3.90mm Width)
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution eligibility for the LP2986AIMX-3.3 is determined by the following critical parameters:

Output voltage fixed at 3.3V
Output current capability of 200mA
8-SOIC package form factor
Surface mount mounting type
Operating temperature range -40°C ~ 125°C
Enable control feature
Protection against over-current, over-temperature, and short-circuit conditions

Substitute parts are grouped into two categories based on electrical performance alignment:

Parametric Equivalents: Parts with identical electrical specifications across input voltage, dropout voltage, quiescent current, and PSRR characteristics. These provide direct functional replacement.

Manufacturer Recommended Alternatives: Parts with modified electrical characteristics (reduced maximum input voltage, improved dropout voltage, modified quiescent current) that maintain core functionality while offering enhanced performance in specific parameters.

Parameter Comparison

Parameter	LP2986AIMX-3.3	LP2986AIMX-3.3/NOPB	LP2986IMX-3.3/NOPB	LP2988AIMX-3.3/NOPB	TPS7433D	TPS7433DR
Manufacturer	Texas Instruments	National Semiconductor	National Semiconductor	National Semiconductor	Texas Instruments	Texas Instruments
Output Voltage	3.3V	3.3V	3.3V	3.3V	3.3V	3.3V
Output Current	200mA	200mA	200mA	200mA	200mA	200mA
Input Voltage (Max)	16V	16V	16V	16V	7V	7V
Dropout Voltage (Max)	0.35V @ 200mA	0.35V @ 200mA	0.35V @ 200mA	0.35V @ 200mA	0.32V @ 200mA	0.32V @ 200mA
Quiescent Current	120 µA	120 µA	120 µA	120 µA	115 µA	115 µA
PSRR	65dB (1kHz)	65dB (1kHz)	65dB (1kHz)	65dB (1kHz)	55dB (100Hz)	55dB (100Hz)
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	Not specified	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

LP2986AIMX-3.3/NOPB, LP2986IMX-3.3/NOPB, and LP2988AIMX-3.3/NOPB maintain identical electrical specifications to the original part. These are suitable for applications requiring exact parameter matching. All three are in active product status with current inventory availability.

For New Designs and RoHS Compliance:

TPS7433D and TPS7433DR are manufacturer-recommended alternatives from Texas Instruments with ROHS3 compliance certification. These parts feature reduced maximum input voltage (7V vs. 16V), improved dropout voltage (0.32V vs. 0.35V), and slightly lower quiescent current (115 µA vs. 120 µA). Selection between TPS7433D (tube packaging) and TPS7433DR (tape & reel packaging) depends on procurement and assembly requirements.

The TPS7433 series introduces reverse polarity protection in addition to the standard over-current and over-temperature protections, providing enhanced circuit robustness.

Frequently Asked Questions (FAQ)

Q: Can LP2986AIMX-3.3/NOPB, LP2986IMX-3.3/NOPB, and LP2988AIMX-3.3/NOPB be used interchangeably with the original LP2986AIMX-3.3?

A: Yes. These parts share identical electrical specifications including output voltage, current rating, dropout voltage, quiescent current, and PSRR characteristics. All are packaged in 8-SOIC form factor with matching pin configurations and protection features.

Q: What is the primary difference between LP2986 and TPS7433 series regulators?

A: The TPS7433 series operates with a maximum input voltage of 7V compared to 16V for the LP2986 series. TPS7433 devices feature improved dropout voltage (0.32V vs. 0.35V) and include reverse polarity protection. Selection depends on your input voltage requirements and desired protection features.

Q: Are there packaging differences between TPS7433D and TPS7433DR?

A: TPS7433D is supplied in tube packaging, while TPS7433DR is supplied in tape & reel format. Both contain identical die and electrical specifications. Packaging selection is determined by assembly line requirements and procurement preferences.

Q: Is the LP2986AIMX-3.3 still available for procurement?

A: The LP2986AIMX-3.3 is classified as obsolete. Current inventory of 6000 pieces is available, but long-term procurement should transition to active alternatives such as LP2986AIMX-3.3/NOPB or the TPS7433 series.

Q: Which substitute part offers the best compliance for new designs?

A: TPS7433D and TPS7433DR are ROHS3 compliant and recommended for new designs requiring regulatory compliance. Both maintain the required 3.3V output at 200mA with enhanced electrical characteristics.

Q: Can I use TPS7433 series in applications with input voltages above 7V?

A: No. The TPS7433 series maximum input voltage is 7V. Applications requiring higher input voltage tolerance must use LP2986 series equivalents, which support up to 16V input.

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