LP2985AIM5-3.3 Equivalent & Substitute Parts

Part Overview

The LP2985AIM5-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications. This Surface Mount device in SOT-23-5 package delivers 150mA output current with integrated protection features including over-current, over-temperature, and short-circuit protection. The main part is currently in Last Time Buy status, making identification of equivalent alternatives essential for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	3.3V
Output Current	150mA
Input Voltage (Max)	16V
Voltage Dropout (Max)	0.58V @ 150mA
Quiescent Current	95 µA
Package	SOT-23-5 (SC-74A)
Mounting Type	Surface Mount
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LP2985AIM5-3.3 is determined by the following critical parameters:

Fixed output voltage of 3.3V
Output current rating of 150mA
Maximum input voltage of 16V
Voltage dropout specification of 0.58V @ 150mA
Quiescent current of 95 µA
SOT-23-5 package configuration
Surface mount mounting type
Operating temperature range of -40°C to 125°C
Integrated protection features (Over Current, Over Temperature, Short Circuit)
Enable control feature

Substitute parts are grouped into two categories: Direct Manufacturer Equivalents (identical part numbers with different packaging or lead-free designations) and Parametric Equivalents (alternative part numbers with identical or compatible electrical specifications).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout @ 150mA	Quiescent Current	Package	Product Status	Inventory
LP2985AIM5-3.3	Texas Instruments	3.3V	150mA	0.58V	95 µA	SOT-23-5	Last Time Buy	18,100 Pcs
LP2985AIM5-3.3/NOPB	Texas Instruments	3.3V	150mA	0.58V	95 µA	SOT-23-5	Active	25,100 Pcs
LP2985-33DBVR	Texas Instruments	3.3V	150mA	0.58V	95 µA	SOT-23-5	Active	55,200 Pcs
LP2985-33DBVRE4	Texas Instruments	3.3V	150mA	0.58V	95 µA	SOT-23-5	Discontinued at DiGi Electronics	2,290 Pcs
LP2985-33DBVT	Texas Instruments	3.3V	150mA	0.575V	125 µA	SOT-23-5	Active	3,330 Pcs
LP2985A-33DBVR	Texas Instruments	3.3V	150mA	0.58V	95 µA	SOT-23-5	Active	56,200 Pcs
LP2985A-33DBVT	Texas Instruments	3.3V	150mA	0.58V	95 µA	SOT-23-5	Active	12,138 Pcs
LP2985AIM5X-3.3/NOPB	Texas Instruments	3.3V	150mA	0.58V	95 µA	SOT-23-5	Active	53,200 Pcs
LP2985IM5-3.3	Texas Instruments	3.3V	150mA	0.58V	95 µA	SOT-23-5	Last Time Buy	26,300 Pcs
LP2985IM5-3.3/NOPB	Texas Instruments	3.3V	150mA	0.58V	95 µA	SOT-23-5	Active	16,043 Pcs
LP2985IM5X-3.3/NOPB	Texas Instruments	3.3V	150mA	0.58V	95 µA	SOT-23-5	Active	33,716 Pcs

Engineering Selection Recommendations

For applications currently using LP2985AIM5-3.3, the following selection criteria apply based on product status and compliance:

Primary Recommendation: LP2985A-33DBVR or LP2985AIM5X-3.3/NOPB are preferred alternatives. Both maintain identical electrical specifications (0.58V dropout, 95 µA quiescent current) and are in Active product status with substantial inventory availability (56,200 Pcs and 53,200 Pcs respectively). Both are ROHS3 compliant with MSL 1 rating.

Secondary Options: LP2985AIM5-3.3/NOPB and LP2985IM5-3.3/NOPB provide direct equivalence with Active status and good inventory levels. These are suitable for designs requiring the specific IM5 package variant designation.

Consideration: LP2985-33DBVT exhibits slightly higher quiescent current (125 µA vs. 95 µA) and marginally lower dropout voltage (0.575V vs. 0.58V). This part is Active but has limited inventory (3,330 Pcs). Selection should account for power consumption sensitivity in the application.

Avoid: LP2985-33DBVRE4 is discontinued at DiGi Electronics and should not be selected for new designs despite remaining inventory.

Frequently Asked Questions (FAQ)

Q: Can LP2985-33DBVT be used as a direct substitute for LP2985AIM5-3.3?

A: LP2985-33DBVT is parametrically equivalent with one specification variance: quiescent current is 125 µA versus 95 µA in the main part. The dropout voltage is 0.575V versus 0.58V. This part is suitable for applications where the higher quiescent current does not impact system power budget. All other electrical and mechanical parameters are identical.

Q: What is the difference between LP2985AIM5-3.3 and LP2985AIM5-3.3/NOPB?

A: The /NOPB designation indicates lead-free (No Lead) and halogen-free packaging. Both parts are electrically and mechanically identical. LP2985AIM5-3.3/NOPB is in Active status while the main part is Last Time Buy, making it the preferred choice for new procurement.

Q: Are all substitute parts in the same SOT-23-5 package?

A: Yes. All listed substitute parts use the SOT-23-5 package (SC-74A designation). They are pin-compatible and suitable for direct PCB footprint replacement without layout modification.

Q: What does "Last Time Buy" status mean for LP2985AIM5-3.3?

A: Last Time Buy indicates that Texas Instruments will no longer manufacture this specific part number after a defined cutoff date. Existing inventory may be available, but new production orders cannot be placed. Active status alternatives should be selected for designs requiring long-term component availability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the compliance profile of the main part.

Q: Which substitute offers the best inventory availability?

A: LP2985A-33DBVR provides the highest inventory level at 56,200 Pcs with Active product status and identical electrical specifications to the main part.

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