LP38690SDX-5.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP38690SDX-5.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output applications with 1A current capacity in a 6-WSON (3x3) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device provides regulated 5V output from input voltages up to 10V with integrated over-temperature protection and low quiescent current characteristics suitable for battery-powered and low-power applications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Fixed)	5V
Voltage - Input (Max)	10V
Current - Output	1A
Voltage Dropout (Max)	0.8V @ 1A
Current - Quiescent (Iq)	55 µA
PSRR	55dB (120Hz)
Protection Features	Over Temperature
Operating Temperature	-40°C ~ 125°C
Package / Case	6-WDFN Exposed Pad
Supplier Device Package	6-WSON (3x3)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LP38690SDX-5.0 are identified based on electrical and mechanical parameter equivalence. The primary substitution criteria are:

Fixed 5V positive output voltage
1A output current capacity
Maximum input voltage of 10V
0.8V maximum dropout voltage at 1A
55 µA quiescent current
6-WSON (3x3) package configuration
Surface mount technology
Over-temperature protection
Operating temperature range of -40°C to 125°C

The substitute parts are grouped into two categories: direct manufacturer equivalents (same base part number with different packaging designations) and parametric equivalents (different base part numbers with identical electrical specifications).

Parameter Comparison

Parameter	LP38690SDX-5.0	LP38690SDX-5.0/NOPB	LP38690SD-5.0/NOPB	LP38692SD-5.0/NOPB	LP38692SDX-5.0/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage (Fixed)	5V	5V	5V	5V	5V
Output Current	1A	1A	1A	1A	1A
Input Voltage (Max)	10V	10V	10V	10V	10V
Dropout Voltage (Max)	0.8V @ 1A	0.8V @ 1A	0.8V @ 1A	0.8V @ 1A	0.8V @ 1A
Quiescent Current	55 µA	55 µA	55 µA	55 µA	55 µA
PSRR	55dB (120Hz)	55dB (120Hz)	55dB (120Hz)	55dB (120Hz)	55dB (120Hz)
Package	6-WSON (3x3)	6-WSON (3x3)	6-WSON (3x3)	6-WSON (3x3)	6-WSON (3x3)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts maintain identical electrical and mechanical specifications to the LP38690SDX-5.0. Selection should be based on product status and regulatory compliance requirements.

For new designs and ongoing procurement, LP38690SDX-5.0/NOPB, LP38690SD-5.0/NOPB, LP38692SD-5.0/NOPB, and LP38692SDX-5.0/NOPB are all active products with ROHS3 compliance. These parts are suitable for applications requiring RoHS compliance and long-term availability.

The primary distinction between substitute options lies in packaging designation: SDX variants indicate specific packaging configurations, while SD variants represent alternative packaging formats. All variants maintain the same 6-WSON (3x3) physical package and electrical performance.

Inventory availability varies across substitute parts, with LP38692SD-5.0/NOPB offering the highest stock level at 28,100 pieces, followed by LP38690SDX-5.0/NOPB at 4,700 pieces.

Frequently Asked Questions (FAQ)

Q: Can LP38690SDX-5.0 be directly replaced with LP38692SD-5.0/NOPB?

A: Yes. Both parts share identical electrical specifications including 5V fixed output, 1A output current, 0.8V dropout voltage, and 6-WSON (3x3) package configuration. The primary difference is the base part number designation (LP38690 versus LP38692) and product status (obsolete versus active). Electrical and mechanical compatibility is complete.

Q: What is the difference between SDX and SD package designations?

A: SDX and SD designations indicate different packaging formats within the same 6-WSON (3x3) physical package. Both are surface mount configurations suitable for identical PCB layouts. The specific packaging designation may relate to tape and reel configurations or supplier-specific handling requirements, but electrical and mechanical compatibility remains unchanged.

Q: Are all substitute parts RoHS compliant?

A: The original LP38690SDX-5.0 is RoHS non-compliant. All active substitute parts (LP38690SDX-5.0/NOPB, LP38690SD-5.0/NOPB, LP38692SD-5.0/NOPB, and LP38692SDX-5.0/NOPB) are ROHS3 compliant, making them suitable for applications with RoHS requirements.

Q: Will the substitute parts work in existing PCB designs for LP38690SDX-5.0?

A: Yes. All substitute parts use the identical 6-WSON (3x3) package with the same pinout and electrical characteristics. No PCB layout modifications are required for direct substitution.

Q: Which substitute part offers the best long-term availability?

A: LP38692SD-5.0/NOPB is the recommended choice for long-term availability, with 28,100 pieces in stock and active product status. This part maintains all electrical and mechanical equivalence to the obsolete LP38690SDX-5.0.

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