LP38690SD-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP38690SD-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device delivers 1A output current in a compact 6-WSON (3x3) package. The part is currently listed as Obsolete, making equivalent and 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	1A
Voltage Dropout (Max)	1.6V @ 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
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LP38690SD-ADJ is determined by the following critical parameters:

Output Configuration: Positive
Output Type: Adjustable
Current - Output: 1A
Voltage - Input (Max): 10V
Voltage - Output Range: 1.25V to 9V
Package / Case: 6-WDFN Exposed Pad
Mounting Type: Surface Mount

The substitute parts are grouped into two categories based on packaging configuration:

Category 1: Cut Tape (CT) & Digi-Reel® Packaging

LP38690SD-ADJ/NOPB
LP38692SD-ADJ/NOPB

Category 2: Tape & Reel (TR) Packaging

LP38690SDX-ADJ/NOPB
LP38692SDX-ADJ/NOPB

All substitute parts maintain identical electrical specifications and package geometry, with differences limited to packaging format and product status compliance.

Parameter Comparison

Parameter	LP38690SD-ADJ	LP38690SD-ADJ/NOPB	LP38690SDX-ADJ/NOPB	LP38692SD-ADJ/NOPB	LP38692SDX-ADJ/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active
Packaging	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)
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	1A	1A	1A	1A	1A
Voltage Dropout (Max)	1.6V @ 1A	1.6V @ 1A	1.6V @ 1A	—	—
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
Package / Case	6-WDFN Exposed Pad	6-WDFN Exposed Pad	6-WDFN Exposed Pad	6-WDFN Exposed Pad	6-WDFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Recommendation: LP38690SD-ADJ/NOPB

This part is the direct equivalent to the obsolete LP38690SD-ADJ with identical electrical and mechanical specifications. It carries Active product status and ROHS3 compliance, making it suitable for new designs and ongoing production. The Cut Tape & Digi-Reel® packaging matches the original part's distribution format.

Secondary Recommendation: LP38690SDX-ADJ/NOPB

This variant provides identical electrical performance with Tape & Reel packaging suitable for high-volume automated assembly operations. Active product status and ROHS3 compliance are maintained.

Alternative Options: LP38692SD-ADJ/NOPB and LP38692SDX-ADJ/NOPB

The LP38692 series maintains all critical electrical parameters and package geometry. These parts are available in both Cut Tape and Tape & Reel formats. Note that voltage dropout specifications are not provided for LP38692 variants; however, all other electrical characteristics remain equivalent.

All substitute parts are ROHS3 compliant, addressing the RoHS non-compliance status of the original LP38690SD-ADJ. Selection between Cut Tape and Tape & Reel packaging should be based on procurement volume and assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can LP38690SD-ADJ/NOPB be used as a direct replacement for LP38690SD-ADJ?

A: Yes. The LP38690SD-ADJ/NOPB is electrically and mechanically identical to the obsolete LP38690SD-ADJ. The primary differences are product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Both use identical 6-WDFN Exposed Pad packaging and Cut Tape & Digi-Reel® distribution.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) & Digi-Reel® packaging is suitable for lower-volume orders and manual assembly processes. Tape & Reel (TR) packaging is optimized for high-volume automated pick-and-place assembly. Electrical performance and package geometry are identical between these formats.

Q: Are LP38692 variants compatible with LP38690 designs?

A: LP38692 variants maintain identical output configuration, adjustable output type, 1A current rating, input voltage range, output voltage range, quiescent current, PSRR, protection features, operating temperature, and package geometry. Voltage dropout specifications are not provided for LP38692 parts. Designs should be evaluated based on specific dropout requirements.

Q: Why is RoHS compliance important for this substitution?

A: The original LP38690SD-ADJ is RoHS non-compliant. All substitute parts (LP38690SD-ADJ/NOPB, LP38690SDX-ADJ/NOPB, LP38692SD-ADJ/NOPB, LP38692SDX-ADJ/NOPB) are ROHS3 compliant, meeting current regulatory requirements for electronic components in many markets.

Q: Can I mix packaging formats in the same production run?

A: Yes. Cut Tape and Tape & Reel variants of the same part number (LP38690 or LP38692 series) are electrically and mechanically identical. Packaging format selection should be based on assembly process capabilities and procurement logistics.

Q: What inventory levels are available for these substitute parts?

A: Current inventory includes LP38690SD-ADJ/NOPB (8,121 pcs), LP38690SDX-ADJ/NOPB (1,367 pcs), LP38692SD-ADJ/NOPB (8,706 pcs), and LP38692SDX-ADJ/NOPB (4,516 pcs). Inventory levels should be confirmed with your supplier for current availability.

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