LP38691SD-ADJ Equivalent & Substitute Parts Reference

Part Overview

The Texas Instruments LP38691SD-ADJ is a linear voltage regulator IC designed for positive adjustable output, with a maximum output current of 500mA in a 6-WSON (3x3) surface-mount package. This Power Management IC (PMIC) has been marked as obsolete. Finding alternative models is necessary for continued production and device maintenance where this component is specified, especially due to lifecycle concerns and supply chain continuity.

Key Parameters

Parameter	Main Part Value
Manufacturer Part Number	LP38691SD-ADJ
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Description	IC REG LIN POS ADJ 500MA 6WSON
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)
Protection Features	Over Temperature
Operating Temperature	-40°C ~ 125°C
Grade	Automotive
Qualification	AEC-Q100
Mounting Type	Surface Mount
Package / Case	6-WDFN Exposed Pad
Supplier Device Package	6-WSON (3x3)
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99

Substitute Part Grouping Explanation

Substitute and equivalent parts are grouped strictly according to matching key electrical, mechanical, and compliance parameters. Critical substitution criteria are:

Output configuration and type: Positive Adjustable
Number of regulators: 1
Maximum input voltage: 10V
Output voltage range: 1.25V to 9V
Maximum output current: 500mA
Package and mounting: 6-WSON (3x3), Surface Mount
Grade/Qualification: Automotive, AEC-Q100
Compliance: ROHS3, REACH Unaffected
Thermal/Protection features: Over Temperature

These parameters are strictly maintained between the LP38691SD-ADJ and its substitutes.

Parameter Comparison

Field	LP38691SD-ADJ	LP38691QSD-ADJ/NOPB	LP38691QSDX-ADJ/NOPB	LP38691SD-ADJ/NOPB	LP38691SDX-ADJ/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Category	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)
Description	IC REG LIN POS ADJ 500MA 6WSON	IC REG LIN POS ADJ 500MA 6WSON	IC REG LIN POS ADJ 500MA 6WSON	IC REG LIN POS ADJ 500MA 6WSON	IC REG LIN POS ADJ 500MA 6WSON
Output Configuration	Positive	Positive	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Number of Regulators	1	1	1	1	1
Voltage - Input (Max)	10V	10V	10V	10V	10V
Voltage - Output (Min/Fixed)	1.25V	1.25V	1.25V	1.25V	1.25V
Voltage - Output (Max)	9V	9V	9V	9V	9V
Current - Output	500mA	500mA	500mA	500mA	500mA
Current - Quiescent (Iq)	55 µA	55 µA	55 µA	55 µA	55 µA
Current - Supply (Max)	100 µA	100 µA	100 µA	100 µA	100 µA
PSRR	55dB (120Hz)	55dB (120Hz)	55dB (120Hz)	55dB (120Hz)	55dB (120Hz)
Protection Features	Over Temperature	Over Temperature	Over Temperature	Over Temperature	Over Temperature
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Grade	Automotive	Automotive	Automotive	Automotive	Automotive
Qualification	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	6-WDFN Exposed Pad	6-WDFN Exposed Pad	6-WDFN Exposed Pad	6-WDFN Exposed Pad	6-WDFN Exposed Pad
Supplier Device Package	6-WSON (3x3)	6-WSON (3x3)	6-WSON (3x3)	6-WSON (3x3)	6-WSON (3x3)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99	EAR99	EAR99

Engineering Selection Recommendations

LP38691SD-ADJ is listed as obsolete. All substitutes provided share identical key electrical and mechanical parameters, ensuring direct replacement in compliant designs. Alternative models such as LP38691QSD-ADJ/NOPB, LP38691QSDX-ADJ/NOPB, LP38691SD-ADJ/NOPB, and LP38691SDX-ADJ/NOPB provide equivalent automotive qualification (AEC-Q100), RoHS3 compliance, REACH unaffected status, matching package, and output parameters.

Frequently Asked Questions (FAQ)

Q1: What are the main electrical criteria for substituting LP38691SD-ADJ?
A: Output configuration (positive adjustable), voltage input/output range, output current, number of regulators, and PSRR must match.

Q2: Are all substitute parts guaranteed to fit in the same PCB footprint as LP38691SD-ADJ?
A: All substitutes use the 6-WSON (3x3) package and surface mount type, ensuring mechanical compatibility.

Q3: Do substitute parts meet the same automotive and environmental standards as the original part?
A: All listed substitutes are AEC-Q100 qualified, RoHS3 compliant, and REACH unaffected.

Q4: Is there any difference in operational temperature range among substitute models?
A: Operating temperature is consistently -40°C to 125°C for all models.

Q5: Why is substitution necessary for LP38691SD-ADJ?
A: LP38691SD-ADJ is obsolete. Substitutes enable continuation of design and assembly where this PMIC linear regulator is required.

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