LP38693MP-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP38693MP-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device delivers 500mA output current in a compact SOT-223-5 package and includes enable control and over-temperature protection features. The main part number is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	10V
Voltage - Output (Min/Fixed)	1.25V
Voltage - Output (Max)	9V
Current - Output	500mA
Current - Quiescent (Iq)	55 µA
Current - Supply (Max)	100 µA
PSRR	55dB (120Hz)
Control Features	Enable
Protection Features	Over Temperature
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LP38693MP-ADJ are determined by strict equivalence across all electrical and mechanical parameters. The following criteria define valid substitutes:

Identical output configuration (Positive) and output type (Adjustable)
Matching voltage specifications: Input (Max) 10V, Output range 1.25V to 9V
Equivalent current ratings: 500mA output, 55 µA quiescent current, 100 µA maximum supply current
Identical control features (Enable) and protection (Over Temperature)
Same operating temperature range: -40°C to 125°C
Identical package type: SOT-223-5 (TO-261-5, TO-261AB)
Surface Mount mounting type

The substitute parts listed below meet all these criteria and differ only in product status (Active vs. Obsolete) and packaging format (Cut Tape & Digi-Reel® or Tape & Reel vs. standard packaging).

Parameter Comparison

Parameter	LP38693MP-ADJ	LP38693MP-ADJ/NOPB	LP38693MPX-ADJ/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	10V	10V	10V
Voltage - Output (Min/Fixed)	1.25V	1.25V	1.25V
Voltage - Output (Max)	9V	9V	9V
Current - Output	500mA	500mA	500mA
Current - Quiescent (Iq)	55 µA	55 µA	55 µA
Current - Supply (Max)	100 µA	100 µA	100 µA
PSRR	55dB (120Hz)	55dB (120Hz)	55dB (120Hz)
Control Features	Enable	Enable	Enable
Protection Features	Over Temperature	Over Temperature	Over Temperature
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-261-5, TO-261AB	TO-261-5, TO-261AB	TO-261-5, TO-261AB
Supplier Device Package	SOT-223-5	SOT-223-5	SOT-223-5
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Standard	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)
Inventory Status	2469 Pcs	22200 Pcs	19100 Pcs

Engineering Selection Recommendations

Both LP38693MP-ADJ/NOPB and LP38693MPX-ADJ/NOPB are direct parametric equivalents to the obsolete LP38693MP-ADJ. Selection between these active alternatives should be based on the following factors:

RoHS Compliance: Both substitute parts are ROHS3 compliant, whereas the main part is RoHS non-compliant. For applications requiring RoHS compliance, either substitute is acceptable.

Product Status: Both substitutes are listed as Active, ensuring long-term availability and manufacturing support compared to the Obsolete status of the main part.

Packaging Format: LP38693MP-ADJ/NOPB is supplied in Cut Tape (CT) & Digi-Reel® format, suitable for automated assembly lines. LP38693MPX-ADJ/NOPB is supplied in Tape & Reel (TR) format, also suitable for high-volume production. Selection depends on your procurement and assembly process requirements.

Inventory Availability: LP38693MP-ADJ/NOPB has 22200 pieces in stock, while LP38693MPX-ADJ/NOPB has 19100 pieces in stock, both significantly exceeding the 2469 pieces available for the obsolete main part.

Frequently Asked Questions (FAQ)

Q: Can LP38693MP-ADJ/NOPB and LP38693MPX-ADJ/NOPB be used interchangeably with LP38693MP-ADJ?

A: Yes. Both substitute parts are parametric equivalents with identical electrical specifications, output ratings, control features, protection mechanisms, operating temperature range, and SOT-223-5 package configuration. The differences are limited to product status (Active vs. Obsolete), RoHS compliance (ROHS3 vs. non-compliant), and packaging format (Cut Tape & Digi-Reel® vs. Tape & Reel).

Q: What is the difference between LP38693MP-ADJ/NOPB and LP38693MPX-ADJ/NOPB?

A: Both parts are electrically identical. The primary difference is packaging format: LP38693MP-ADJ/NOPB uses Cut Tape (CT) & Digi-Reel® packaging, while LP38693MPX-ADJ/NOPB uses Tape & Reel (TR) packaging. Choose based on your assembly equipment and procurement workflow.

Q: Why is the main part LP38693MP-ADJ listed as Obsolete?

A: The obsolete status indicates that Texas Instruments has discontinued this specific part number variant. The active substitute part numbers (LP38693MP-ADJ/NOPB and LP38693MPX-ADJ/NOPB) represent the current manufacturing alternatives with identical performance characteristics.

Q: Are there RoHS compliance differences between these parts?

A: Yes. The main part LP38693MP-ADJ is RoHS non-compliant, while both substitutes (LP38693MP-ADJ/NOPB and LP38693MPX-ADJ/NOPB) are ROHS3 compliant. For applications subject to RoHS regulations, use either substitute part.

Q: Will the SOT-223-5 package fit my existing PCB design?

A: All three part numbers use the identical SOT-223-5 package (TO-261-5, TO-261AB case). PCB footprints and board layouts designed for LP38693MP-ADJ are directly compatible with LP38693MP-ADJ/NOPB and LP38693MPX-ADJ/NOPB without modification.

Q: What are the key electrical parameters I should verify for my application?

A: Confirm that your circuit design operates within these specifications: input voltage maximum 10V, adjustable output voltage range 1.25V to 9V, output current 500mA, operating temperature -40°C to 125°C, and that your design utilizes the Enable control feature and over-temperature protection.

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