LP2985IM5-4.5 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2985IM5-4.5 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 part is classified as obsolete, making identification of active equivalent alternatives essential for new designs and ongoing production support.

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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LP2985IM5-4.5 is determined by strict equivalence across the following electrical and mechanical parameters:

Output voltage: 4.5V fixed
Maximum output current: 150mA
Maximum input voltage: 16V
Dropout voltage: 0.58V @ 150mA
Quiescent current: 95 µA
PSRR: 45dB (1kHz)
Protection features: Over Current, Over Temperature, Short Circuit
Package: SOT-23-5 (SC-74A, SOT-753)
Operating temperature range: -40°C ~ 125°C

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

Parameter Comparison

Parameter	LP2985IM5-4.5	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
Output Voltage (Fixed)	4.5V	4.5V	4.5V	4.5V	4.5V
Output Current	150mA	150mA	150mA	150mA	150mA
Input Voltage (Max)	16V	16V	16V	16V	16V
Dropout Voltage (Max)	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA
Quiescent Current	95 µA	95 µA	95 µA	95 µA	95 µA
PSRR	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)
Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Not specified	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)
Inventory Status	3770 Pcs	902 Pcs	56300 Pcs	4090 Pcs	16431 Pcs

Engineering Selection Recommendations

All four substitute parts (LP2985AIM5-4.5/NOPB, LP2985AIM5X-4.5/NOPB, LP2985IM5-4.5/NOPB, and LP2985IM5X-4.5/NOPB) are electrically and mechanically equivalent to the LP2985IM5-4.5 and are classified as active products.

For new designs and production applications requiring RoHS3 compliance, any of the four active substitutes are suitable. The primary selection criteria should be based on packaging format availability and inventory requirements:

LP2985AIM5X-4.5/NOPB offers the highest inventory availability (56300 Pcs) in Tape & Reel format
LP2985IM5X-4.5/NOPB provides 16431 Pcs in Tape & Reel format
LP2985IM5-4.5/NOPB is available in Cut Tape & Digi-Reel® format with 4090 Pcs
LP2985AIM5-4.5/NOPB is available in Tape & Reel format with 902 Pcs

All parts maintain identical electrical performance, protection features, and operating temperature specifications. The "X" designation in part numbers LP2985AIM5X-4.5/NOPB and LP2985IM5X-4.5/NOPB indicates extended temperature or processing specifications within the same -40°C ~ 125°C operating range.

Frequently Asked Questions (FAQ)

Q: Can LP2985AIM5-4.5/NOPB directly replace LP2985IM5-4.5?

A: Yes. Both parts deliver identical electrical performance with 4.5V fixed output, 150mA current capacity, and 0.58V maximum dropout voltage. The primary difference is product status: LP2985IM5-4.5 is obsolete while LP2985AIM5-4.5/NOPB is active. The "A" designation indicates an active product variant.

Q: What is the difference between LP2985IM5X-4.5/NOPB and LP2985IM5-4.5/NOPB?

A: Both parts are electrically identical with the same 4.5V output and 150mA capacity. The "X" designation indicates a processing or qualification variant. Both are active products with ROHS3 compliance. Selection should be based on packaging format and inventory availability.

Q: Are all substitutes RoHS compliant?

A: The original LP2985IM5-4.5 is RoHS non-compliant. All four active substitutes (LP2985AIM5-4.5/NOPB, LP2985AIM5X-4.5/NOPB, LP2985IM5-4.5/NOPB, and LP2985IM5X-4.5/NOPB) are ROHS3 compliant, meeting current environmental regulations.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® formats contain identical die and electrical specifications. Format selection is determined by assembly process requirements and volume needs.

Q: Can I use these parts interchangeably on the same PCB?

A: Yes. All substitute parts use the SOT-23-5 package (SC-74A, SOT-753) with identical pinout and footprint. They are pin-for-pin compatible and require no circuit modifications.

Q: Which substitute should I choose for new production?

A: For new designs, select from the active substitutes based on your packaging requirements and supply chain preferences. LP2985AIM5X-4.5/NOPB offers the highest inventory availability. All four options provide equivalent electrical performance and RoHS3 compliance.

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