LP38841MR-ADJ Linear Voltage Regulator

Part Overview

The LP38841MR-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device delivers 800mA output current with adjustable voltage regulation from 0.56V to 1.5V. The component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The LP38841MR-ADJ/NOPB variant provides an active, production-supported alternative with identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	5.5V
Voltage - Output (Min/Fixed)	0.56V
Voltage - Output (Max)	1.5V
Current - Output	800mA
Voltage Dropout (Max)	0.21V @ 800mA
Current - Quiescent (Iq)	30 µA
Current - Supply (Max)	40 mA
PSRR	80dB ~ 65dB (120Hz ~ 1kHz)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	8-PowerSOIC (0.154", 3.90mm Width)
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the LP38841MR-ADJ is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

Output configuration (Positive)
Output type (Adjustable)
Voltage range (Input Max: 5.5V; Output Min/Fixed: 0.56V; Output Max: 1.5V)
Current capacity (800mA output)
Voltage dropout (0.21V @ 800mA)
Quiescent current (30 µA)
Protection features (Over Current, Over Temperature, Short Circuit)
Control features (Enable)

Mechanical Specifications:

Package type (8-PowerSOIC)
Physical dimensions (0.154", 3.90mm Width)
Mounting type (Surface Mount)
Moisture sensitivity level (MSL 3)

The LP38841MR-ADJ/NOPB is a direct substitute, maintaining identical electrical performance and mechanical compatibility while offering active product status and improved compliance certifications.

Parameter Comparison

Parameter	LP38841MR-ADJ	LP38841MR-ADJ/NOPB
Manufacturer	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active
Output Configuration	Positive	Positive
Output Type	Adjustable	Adjustable
Voltage - Input (Max)	5.5V	5.5V
Voltage - Output (Min/Fixed)	0.56V	0.56V
Voltage - Output (Max)	1.5V	1.5V
Current - Output	800mA	800mA
Voltage Dropout (Max)	0.21V @ 800mA	0.21V @ 800mA
Current - Quiescent (Iq)	30 µA	30 µA
Current - Supply (Max)	40 mA	40 mA
PSRR	80dB ~ 65dB (120Hz ~ 1kHz)	80dB ~ 65dB (120Hz ~ 1kHz)
Control Features	Enable	Enable
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	8-PowerSOIC (0.154", 3.90mm Width)	8-PowerSOIC (0.154", 3.90mm Width)
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
RoHS Status	RoHS non-compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The LP38841MR-ADJ/NOPB is the direct equivalent substitute for the obsolete LP38841MR-ADJ. Both components share identical electrical specifications and mechanical packaging, ensuring pin-for-pin and functional compatibility in existing circuit designs.

The primary distinction between these parts is product lifecycle status and regulatory compliance. The LP38841MR-ADJ is classified as obsolete and carries RoHS non-compliant certification. The LP38841MR-ADJ/NOPB maintains active production status and meets ROHS3 compliance requirements, making it the appropriate selection for new designs and applications subject to environmental regulations.

Both components are manufactured by Texas Instruments and supplied in 8-PowerSOIC packaging with identical thermal and electrical performance characteristics. Selection between these parts should be based on design phase (new vs. legacy) and regulatory requirements applicable to the end application.

Frequently Asked Questions (FAQ)

Q: Can LP38841MR-ADJ/NOPB replace LP38841MR-ADJ in existing designs?

A: Yes. The LP38841MR-ADJ/NOPB is a direct substitute with identical electrical specifications, output voltage range (0.56V to 1.5V), current capacity (800mA), and 8-PowerSOIC package dimensions. No circuit modifications are required.

Q: What is the difference between LP38841MR-ADJ and LP38841MR-ADJ/NOPB?

A: The primary differences are product status and compliance certification. LP38841MR-ADJ is obsolete and RoHS non-compliant. LP38841MR-ADJ/NOPB is active production and ROHS3 compliant. Electrical and mechanical specifications are identical.

Q: Are there packaging differences between these parts?

A: The LP38841MR-ADJ is supplied without specified packaging. The LP38841MR-ADJ/NOPB is supplied in Tube packaging. Both use the same 8-PowerSOIC (0.154", 3.90mm Width) case. PCB layout and assembly processes remain unchanged.

Q: What protection features are included in this regulator?

A: The LP38841MR-ADJ and LP38841MR-ADJ/NOPB include Over Current, Over Temperature, and Short Circuit protection. These features are active across the full operating temperature range of -40°C to 125°C.

Q: Is this regulator suitable for adjustable output applications?

A: Yes. Both parts feature adjustable output type with voltage range from 0.56V to 1.5V, controlled through external resistor networks. Enable control feature allows on/off switching of the regulator output.

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