LP2985AIM5-4.5 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2985AIM5-4.5 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 150mA output current with a fixed 4.5V output and operates across an input voltage range up to 16V. The main part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. Active alternatives with identical electrical and mechanical specifications are available from the same manufacturer.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	4.5V
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
Base Product Number	LP2985

Substitute Part Grouping Explanation

Substitution of the LP2985AIM5-4.5 is determined by strict equivalence across the following critical parameters:

Output voltage: 4.5V fixed
Output current capability: 150mA
Input voltage maximum: 16V
Voltage dropout: 0.58V @ 150mA
Package type: SOT-23-5 (SC-74A, SOT-753)
Mounting: Surface Mount
Control and protection features: Enable, Over Current, Over Temperature, Short Circuit

All substitute parts maintain identical electrical performance and mechanical compatibility. Differences exist only in product status (active vs. obsolete) and packaging format (Tape & Reel vs. Cut Tape).

Parameter Comparison

Parameter	LP2985AIM5-4.5	LP2985AIM5-4.5/NOPB	LP2985AIM5X-4.5/NOPB	LP2985IM5-4.5/NOPB	LP2985IM5X-4.5/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active
Voltage - Output (Min/Fixed)	4.5V	4.5V	4.5V	4.5V	4.5V
Voltage - Input (Max)	16V	16V	16V	16V	16V
Current - Output	150mA	150mA	150mA	150mA	150mA
Voltage Dropout (Max)	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA
Current - Quiescent (Iq)	95 µA	95 µA	95 µA	95 µA	95 µA
PSRR	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753
Supplier Device Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)

Engineering Selection Recommendations

For new designs and procurement, LP2985AIM5X-4.5/NOPB is the primary recommended substitute. This part is active, ROHS3 compliant, and available in high volume (56,300 pcs in stock). The "X" suffix indicates extended temperature range qualification and enhanced manufacturing process control.

LP2985IM5X-4.5/NOPB serves as a secondary option with equivalent specifications and active status. Both parts feature NOPB (No Plumbum/Lead-Free) designation, meeting modern environmental and regulatory requirements.

LP2985IM5-4.5/NOPB and LP2985AIM5-4.5/NOPB are functionally equivalent alternatives available in different packaging formats (Cut Tape and Tape & Reel respectively) for varying procurement workflows.

The original LP2985AIM5-4.5 is obsolete and should not be specified for new designs. Existing inventory of 2,100 pcs may support legacy production requirements only.

Frequently Asked Questions (FAQ)

Q: Can LP2985AIM5X-4.5/NOPB directly replace LP2985AIM5-4.5 in existing designs?

A: Yes. All electrical parameters, output voltage, current rating, dropout voltage, and thermal characteristics are identical. The SOT-23-5 package footprint is unchanged. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What does the "X" suffix in LP2985AIM5X-4.5/NOPB indicate?

A: The "X" suffix denotes extended manufacturing process qualification and enhanced temperature range characterization. This does not alter the specified operating temperature range (-40°C ~ 125°C) but indicates more rigorous process control and reliability testing.

Q: Are there differences between Tape & Reel and Cut Tape packaging?

A: No electrical or mechanical differences exist. Tape & Reel packaging is optimized for high-volume automated assembly. Cut Tape & Digi-Reel® is suitable for lower-volume or mixed-component orders. Both formats contain identical components.

Q: Why is RoHS compliance important for this substitution?

A: ROHS3 compliance is required for products sold into European markets and many other regions. The original LP2985AIM5-4.5 is RoHS non-compliant. All active substitutes are ROHS3 compliant, ensuring regulatory acceptance and supply chain continuity.

Q: Can I use LP2985IM5-4.5/NOPB instead of LP2985AIM5-4.5/NOPB?

A: Yes. Both parts are parametrically equivalent. The difference is packaging format (Cut Tape vs. Tape & Reel). Select based on procurement and assembly requirements.

Q: What is the inventory status for each substitute?

A: LP2985AIM5X-4.5/NOPB has the highest availability (56,300 pcs). LP2985IM5X-4.5/NOPB has 16,431 pcs. LP2985IM5-4.5/NOPB has 4,090 pcs. LP2985AIM5-4.5/NOPB has 902 pcs. The original LP2985AIM5-4.5 has 2,100 pcs but is obsolete.

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