LP38690SDX-1.8 Equivalent & Substitute Parts

Part Overview

The LP38690SDX-1.8 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output at 1A current capacity in a 6-WSON (3x3) surface mount package. This part is classified as obsolete, making identification of active equivalent alternatives essential for new designs and ongoing production support. The substitute parts listed maintain identical electrical specifications and mechanical compatibility while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.8V
Current - Output	1A
Voltage - Input (Max)	10V
Voltage Dropout (Max)	1.6V @ 1A
Current - Quiescent (Iq)	55 µA
PSRR	55dB (120Hz)
Protection Features	Over Temperature
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	6-WDFN Exposed Pad
Supplier Device Package	6-WSON (3x3)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LP38690SDX-1.8 is determined by strict equivalence across the following critical parameters:

Output voltage specification: 1.8V fixed
Output current capacity: 1A
Maximum input voltage: 10V
Dropout voltage: 1.6V @ 1A
Quiescent current: 55 µA
PSRR performance: 55dB (120Hz)
Thermal protection: Over Temperature
Operating temperature range: -40°C ~ 125°C
Package form factor: 6-WSON (3x3) with exposed pad
Surface mount configuration

The substitute parts LP38690SD-1.8/NOPB and LP38692SD-1.8/NOPB meet all these criteria. The primary distinction between candidates is product status (active vs. obsolete) and packaging configuration (Cut Tape & Digi-Reel® vs. Tape & Reel).

Parameter Comparison

Parameter	LP38690SDX-1.8	LP38690SD-1.8/NOPB	LP38692SD-1.8/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Output Configuration	Positive	Positive	Positive
Output Type	Fixed	Fixed	Fixed
Voltage - Output (Min/Fixed)	1.8V	1.8V	1.8V
Current - Output	1A	1A	1A
Voltage - Input (Max)	10V	10V	10V
Voltage Dropout (Max)	1.6V @ 1A	1.6V @ 1A	1.6V @ 1A
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)
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	6-WDFN Exposed Pad	6-WDFN Exposed Pad	6-WDFN Exposed Pad
Supplier Device Package	6-WSON (3x3)	6-WSON (3x3)	6-WSON (3x3)
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Configuration	Standard	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)

Engineering Selection Recommendations

Both LP38690SD-1.8/NOPB and LP38692SD-1.8/NOPB are direct functional equivalents to the obsolete LP38690SDX-1.8. Selection between these two active alternatives should be based on the following factors:

LP38690SD-1.8/NOPB is recommended for applications requiring flexible packaging options, as it is available in Cut Tape (CT) & Digi-Reel® configuration suitable for both manual assembly and automated pick-and-place operations.

LP38692SD-1.8/NOPB is recommended for high-volume production environments where Tape & Reel (TR) packaging is standard for automated assembly lines.

Both substitute parts carry ROHS3 compliance certification, providing regulatory advantage over the non-compliant original part. Electrical performance, thermal characteristics, and mechanical compatibility are identical across all three part numbers.

Frequently Asked Questions (FAQ)

Q: Can LP38690SD-1.8/NOPB and LP38692SD-1.8/NOPB be used interchangeably with LP38690SDX-1.8?

A: Yes. Both substitute parts are parametric equivalents with identical electrical specifications, output voltage (1.8V), output current (1A), dropout voltage (1.6V @ 1A), and 6-WSON (3x3) package form factor. The primary differences are product status (active vs. obsolete) and packaging configuration.

Q: What is the difference between the two substitute parts?

A: LP38690SD-1.8/NOPB is supplied in Cut Tape (CT) & Digi-Reel® packaging, while LP38692SD-1.8/NOPB is supplied in Tape & Reel (TR) packaging. Both use the same die and package. Selection depends on assembly process requirements and volume.

Q: Are there compliance differences between the original and substitute parts?

A: Yes. The original LP38690SDX-1.8 is RoHS non-compliant, while both substitute parts (LP38690SD-1.8/NOPB and LP38692SD-1.8/NOPB) are ROHS3 compliant. This provides regulatory advantage for new designs and applications subject to RoHS requirements.

Q: Will the substitute parts work in existing PCB designs without modification?

A: Yes. Both substitute parts use the identical 6-WSON (3x3) package with exposed pad, ensuring pin-for-pin and footprint compatibility with the original part. No PCB redesign is required.

Q: What is the inventory status of these substitute parts?

A: LP38690SD-1.8/NOPB has 2474 pieces in stock. LP38692SD-1.8/NOPB has 2284 pieces in stock. Both are actively manufactured by Texas Instruments.

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