LP2985AIM5X-4.0 Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LP2985AIM5X-4.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 150mA output current with a fixed 4V output and operates across an input voltage range up to 16V. The main part number is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	4V
Voltage - Input (Max)	16V
Current - Output	150mA
Voltage Dropout (Max)	0.58V @ 150mA
Current - Quiescent (Iq)	95 µA
PSRR	45dB (1kHz)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LP2985AIM5X-4.0 is determined by strict equivalence across the following critical parameters:

Output voltage: 4V fixed
Output current capability: 150mA
Input voltage range: up to 16V maximum
Voltage dropout: 0.58V @ 150mA
Package type: SOT-23-5 (SC-74A, SOT-753)
Mounting type: Surface Mount
Protection features: Over Current, Over Temperature, Short Circuit
Operating temperature range: -40°C ~ 125°C

All substitute parts listed maintain identical electrical specifications and mechanical compatibility. Differences exist only in product status, packaging format (Tape & Reel vs. Cut Tape), and RoHS compliance status.

Parameter Comparison

Part Number	Manufacturer	Product Status	Packaging	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package Type	RoHS Status	Inventory (Pcs)
LP2985AIM5X-4.0	Texas Instruments	Obsolete	-	4V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	RoHS non-compliant	4600
LP2985AIM5X-4.0/NOPB	Texas Instruments	Active	Tape & Reel (TR)	4V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	ROHS3 Compliant	5731
LP2985AIM5-4.0/NOPB	Texas Instruments	Active	Cut Tape (CT) & Digi-Reel®	4V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	ROHS3 Compliant	1612
LP2985IM5-4.0/NOPB	Texas Instruments	Active	Cut Tape (CT) & Digi-Reel®	4V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	ROHS3 Compliant	2100
LP2985IM5X-4.0/NOPB	Texas Instruments	Active	Cut Tape (CT) & Digi-Reel®	4V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	ROHS3 Compliant	4205

Engineering Selection Recommendations

All listed substitute parts are direct electrical and mechanical equivalents to the LP2985AIM5X-4.0. Selection should be based on the following factors:

Product Status: The original part is obsolete. All substitute parts listed carry active product status from Texas Instruments, ensuring long-term availability and continued manufacturing support.

RoHS Compliance: The original LP2985AIM5X-4.0 is RoHS non-compliant. All substitute parts (LP2985AIM5X-4.0/NOPB, LP2985AIM5-4.0/NOPB, LP2985IM5-4.0/NOPB, LP2985IM5X-4.0/NOPB) are ROHS3 compliant, meeting current environmental and regulatory requirements.

Packaging Format: LP2985AIM5X-4.0/NOPB is supplied in Tape & Reel format, suitable for high-volume automated assembly. LP2985AIM5-4.0/NOPB, LP2985IM5-4.0/NOPB, and LP2985IM5X-4.0/NOPB are supplied in Cut Tape & Digi-Reel format, appropriate for lower-volume or mixed-component procurement.

Inventory Availability: All substitute parts maintain adequate stock levels, with LP2985AIM5X-4.0/NOPB offering the highest availability at 5731 units.

Frequently Asked Questions (FAQ)

Q: Can LP2985AIM5X-4.0/NOPB directly replace the obsolete LP2985AIM5X-4.0?

A: Yes. LP2985AIM5X-4.0/NOPB is electrically and mechanically identical to the original part. The primary differences are active product status and ROHS3 compliance. The "/NOPB" suffix indicates lead-free solder ball construction.

Q: What is the difference between LP2985AIM5X-4.0/NOPB and LP2985AIM5-4.0/NOPB?

A: Both parts are parametrically equivalent with identical electrical specifications and SOT-23-5 packaging. The difference lies in packaging format: LP2985AIM5X-4.0/NOPB is supplied in Tape & Reel, while LP2985AIM5-4.0/NOPB is supplied in Cut Tape & Digi-Reel.

Q: Are all substitute parts compatible with the original PCB design?

A: Yes. All substitute parts use the same SOT-23-5 package (SC-74A, SOT-753) with identical pin configuration and electrical characteristics. No PCB modifications are required.

Q: What does the "X" designation in LP2985IM5X-4.0/NOPB indicate?

A: The "X" suffix indicates extended temperature range or manufacturing variation within the same electrical specification. All listed parts maintain the same -40°C ~ 125°C operating temperature range.

Q: Which substitute part should be selected for new designs?

A: For new designs, any of the active substitute parts are acceptable. Selection should be based on procurement volume and packaging requirements: Tape & Reel for high-volume automated assembly, or Cut Tape & Digi-Reel for lower-volume applications.

Q: Are there any functional differences between the substitute parts?

A: No. All substitute parts deliver identical output voltage (4V), output current (150mA), dropout voltage (0.58V @ 150mA), quiescent current (95 µA), and protection features (Over Current, Over Temperature, Short Circuit).

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