LP2985AIM5-3.8 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2985AIM5-3.8 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 150mA output current with a fixed 3.8V output and operates across an input voltage range up to 16V. The main part number is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Direct manufacturer alternatives and parametric equivalents are available to maintain circuit functionality and performance specifications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	3.8V
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 LP2985AIM5-3.8 is determined by strict equivalence across the following critical parameters:

Output voltage: 3.8V fixed
Maximum output current: 150mA
Maximum input voltage: 16V
Voltage dropout: 0.58V @ 150mA
Package type: SOT-23-5 (SC-74A, SOT-753)
Control features: Enable function
Protection: Over Current, Over Temperature, Short Circuit

All substitute parts listed maintain identical electrical specifications and mechanical compatibility. Differences exist only in product status, packaging format (Tape & Reel, Cut Tape, or Digi-Reel), and RoHS compliance status. These variations do not affect circuit performance or pin compatibility.

Parameter Comparison

Parameter	LP2985AIM5-3.8	LP2985AIM5-3.8/NOPB	LP2985AIM5X-3.8/NOPB	LP2985IM5-3.8/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Last Time Buy	Active
Packaging	Bulk	Tape & Reel (TR)	Cut Tape (CT)	Cut Tape (CT) & Digi-Reel®
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Voltage - Output (Min/Fixed)	3.8V	3.8V	3.8V	3.8V
Voltage - Input (Max)	16V	16V	16V	16V
Current - Output	150mA	150mA	150mA	150mA
Voltage Dropout (Max)	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA
Current - Quiescent (Iq)	95 µA	95 µA	95 µA	95 µA
PSRR	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)
Package / Case	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
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Control Features	Enable	Enable	Enable	Enable
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All listed substitute parts are electrically and mechanically equivalent to the LP2985AIM5-3.8. Selection should be based on the following criteria:

For Active Production: LP2985AIM5-3.8/NOPB and LP2985IM5-3.8/NOPB are both active products with ROHS3 compliance, making them suitable for new designs and ongoing production. LP2985AIM5-3.8/NOPB is available in Tape & Reel packaging, while LP2985IM5-3.8/NOPB is available in Cut Tape and Digi-Reel formats.

For Existing Inventory: LP2985AIM5X-3.8/NOPB is classified as Last Time Buy and carries ROHS3 compliance. This part remains available but with limited procurement window.

Compliance Consideration: The original LP2985AIM5-3.8 is RoHS non-compliant. All substitute parts listed are ROHS3 compliant, meeting current regulatory requirements for new applications and manufacturing environments.

Packaging Selection: Choose packaging format based on assembly requirements: Tape & Reel for automated high-volume production, Cut Tape for lower-volume or mixed-component orders, and Digi-Reel for specialized handling requirements.

Frequently Asked Questions (FAQ)

Q: Can LP2985AIM5-3.8/NOPB be used as a direct replacement for LP2985AIM5-3.8?

A: Yes. Both parts are electrically and mechanically identical. The /NOPB suffix indicates lead-free solder ball material and ROHS3 compliance. The primary difference is packaging format and product status. LP2985AIM5-3.8/NOPB is active and available in Tape & Reel format.

Q: What is the difference between LP2985AIM5X-3.8/NOPB and LP2985IM5-3.8/NOPB?

A: Both parts are parametric equivalents with identical electrical specifications. LP2985AIM5X-3.8/NOPB is available in Cut Tape packaging and is classified as Last Time Buy. LP2985IM5-3.8/NOPB is active and available in Cut Tape and Digi-Reel formats. For new designs, LP2985IM5-3.8/NOPB is the preferred choice due to active product status.

Q: Are all substitute parts compatible with the same PCB layout?

A: Yes. All substitute parts use the SOT-23-5 package (SC-74A, SOT-753 case designation) with identical pin configuration and mechanical dimensions. No PCB layout modifications are required.

Q: Does the packaging format affect electrical performance?

A: No. Packaging format (Tape & Reel, Cut Tape, or Digi-Reel) affects only handling, storage, and assembly processes. Electrical specifications and performance remain identical across all packaging options.

Q: Why is RoHS compliance important for substitution?

A: ROHS3 compliance is a regulatory requirement for manufacturing and distribution in many markets. The original LP2985AIM5-3.8 is RoHS non-compliant, while all substitute parts are ROHS3 compliant. For new designs and production environments subject to RoHS regulations, compliant substitutes are mandatory.

Q: Can I mix different substitute part numbers in the same production batch?

A: Yes. All substitute parts are electrically and mechanically equivalent. However, for traceability and quality control purposes, maintaining consistent part numbers within a single production batch is recommended.

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