LP2985IM5-3.8 Equivalent & Substitute Parts

Part Overview

The LP2985IM5-3.8 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 150mA output current at a fixed 3.8V output voltage with a maximum dropout voltage of 0.58V at full load. The part is classified as Obsolete, which necessitates identification of equivalent substitute components for ongoing design support and procurement continuity.

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)
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the LP2985IM5-3.8 is determined by strict equivalence across the following critical parameters:

Output voltage: 3.8V fixed
Output current capability: 150mA
Maximum input voltage: 16V
Dropout voltage: 0.58V @ 150mA
Package type: SOT-23-5 (SC-74A, SOT-753)
Control features: Enable function
Protection: Over Current, Over Temperature, Short Circuit
Operating temperature range: -40°C ~ 125°C

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

Parameter Comparison

Parameter	LP2985IM5-3.8	LP2985AIM5-3.8/NOPB	LP2985AIM5X-3.8/NOPB	LP2985IM5-3.8/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage	3.8V	3.8V	3.8V	3.8V
Output Current	150mA	150mA	150mA	150mA
Input Voltage (Max)	16V	16V	16V	16V
Dropout Voltage (Max)	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA
Quiescent Current	95 µA	95 µA	95 µA	95 µA
PSRR	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)
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
Product Status	Obsolete	Active	Last Time Buy	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Bulk	Tape & Reel (TR)	Cut Tape (CT)	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

For new designs and ongoing procurement, LP2985IM5-3.8/NOPB is the primary recommended substitute. This part maintains Active product status, ensuring long-term availability and supply chain stability. It carries ROHS3 compliance, meeting modern environmental and regulatory requirements, while delivering identical electrical performance to the obsolete LP2985IM5-3.8.

LP2985AIM5-3.8/NOPB serves as a secondary option with equivalent specifications and Active status. The Tape & Reel packaging format suits high-volume automated assembly operations.

LP2985AIM5X-3.8/NOPB is available with Last Time Buy status, indicating limited future availability. This part is suitable only for applications requiring immediate procurement from existing inventory, not for long-term design commitments.

All three substitute parts are electrically and mechanically interchangeable with the original LP2985IM5-3.8 across the specified parameter set.

Frequently Asked Questions (FAQ)

Q: Can LP2985IM5-3.8/NOPB directly replace the obsolete LP2985IM5-3.8?

A: Yes. Both parts deliver identical electrical specifications: 3.8V fixed output, 150mA output current, 0.58V maximum dropout voltage, and SOT-23-5 package. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between the three substitute parts?

A: All three substitutes are electrically identical. Differences exist only in packaging format and product status. LP2985IM5-3.8/NOPB and LP2985AIM5-3.8/NOPB are Active products. LP2985AIM5X-3.8/NOPB carries Last Time Buy status. Packaging varies between Tape & Reel (TR), Cut Tape (CT), and Digi-Reel® formats to accommodate different procurement and assembly workflows.

Q: Are there any pin or footprint differences between these parts?

A: No. All parts use the SOT-23-5 package (SC-74A, SOT-753 case designation). Pin configuration, footprint, and mechanical dimensions are identical.

Q: Does RoHS compliance affect electrical performance?

A: No. ROHS3 compliance reflects manufacturing process changes to eliminate restricted substances. Electrical specifications, performance characteristics, and operating parameters remain unchanged.

Q: Which substitute should I select for a new design?

A: LP2985IM5-3.8/NOPB is the recommended choice for new designs. It maintains Active product status, ensuring sustained availability, and meets ROHS3 environmental standards.

Q: Can I use LP2985AIM5X-3.8/NOPB in production?

A: LP2985AIM5X-3.8/NOPB is electrically equivalent but carries Last Time Buy status, indicating limited future availability. Use this part only when immediate procurement from existing inventory is required, not for designs requiring long-term component supply.

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