LP38690SDX-3.3 Linear Voltage Regulator — Equivalent & Substitute Parts

Part Overview

The LP38690SDX-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 3.3V output at 1A maximum current in a 6-WSON (3x3) surface mount package. The main part is currently listed as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	3.3V
Output Current	1A
Input Voltage (Max)	10V
Voltage Dropout (Max)	1V @ 1A
Quiescent Current	55 µA
PSRR	55dB (120Hz)
Package / Case	6-WDFN Exposed Pad
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Temperature
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the LP38690SDX-3.3 is determined by strict equivalence across the following parameters:

Output voltage: 3.3V fixed
Output current capability: 1A
Input voltage rating: 10V maximum
Voltage dropout: 1V @ 1A
Quiescent current: 55 µA
PSRR: 55dB (120Hz)
Package: 6-WDFN Exposed Pad (6-WSON 3x3)
Operating temperature range: -40°C to 125°C
Protection: Over Temperature

All identified substitute parts meet these electrical and mechanical parameters. Differences exist only in product status, RoHS compliance, packaging format (Cut Tape, Digi-Reel, or Tape & Reel), and inventory availability.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	PSRR	Package	Operating Temp	Product Status	RoHS Status
LP38690SDX-3.3	Texas Instruments	3.3V	1A	10V	1V @ 1A	55 µA	55dB (120Hz)	6-WDFN Exposed Pad	-40°C to 125°C	Obsolete	RoHS Non-Compliant
LP38690SD-3.3/NOPB	Texas Instruments	3.3V	1A	10V	1V @ 1A	55 µA	55dB (120Hz)	6-WDFN Exposed Pad	-40°C to 125°C	Active	RoHS3 Compliant
LP38690SDX-3.3/NOPB	Texas Instruments	3.3V	1A	10V	1V @ 1A	55 µA	55dB (120Hz)	6-WDFN Exposed Pad	-40°C to 125°C	Active	RoHS3 Compliant
LP38692SD-3.3/NOPB	Texas Instruments	3.3V	1A	10V	1V @ 1A	55 µA	55dB (120Hz)	6-WDFN Exposed Pad	-40°C to 125°C	Active	RoHS3 Compliant
LP38692SDX-3.3/NOPB	Texas Instruments	3.3V	1A	10V	1V @ 1A	55 µA	55dB (120Hz)	6-WDFN Exposed Pad	-40°C to 125°C	Active	RoHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed above are electrically and mechanically equivalent to the LP38690SDX-3.3. Selection should be based on the following criteria:

Product Status: The main part (LP38690SDX-3.3) is obsolete. All substitute parts are active products, ensuring long-term availability and continued manufacturer support.

RoHS Compliance: The original part is RoHS non-compliant. All substitute parts are RoHS3 compliant, meeting current environmental and regulatory requirements for new designs and procurement.

Packaging Format: Substitute parts are available in three packaging options:

Cut Tape (CT) & Digi-Reel® format: LP38690SD-3.3/NOPB, LP38692SD-3.3/NOPB
Tape & Reel (TR) format: LP38692SDX-3.3/NOPB
Cut Tape (CT) & Digi-Reel® format: LP38690SDX-3.3/NOPB

Select packaging based on procurement volume and assembly line requirements.

Inventory Availability: LP38690SD-3.3/NOPB and LP38690SDX-3.3/NOPB offer the highest stock levels (63,200 and 63,300 units respectively), providing supply chain security for high-volume applications.

Frequently Asked Questions (FAQ)

Q: Can LP38690SD-3.3/NOPB directly replace LP38690SDX-3.3?

A: Yes. Both parts are electrically and mechanically identical. The primary difference is product status (active vs. obsolete) and RoHS compliance. The SD variant uses Cut Tape & Digi-Reel packaging, while the SDX variant uses the same package format but with different distribution channels.

Q: What is the difference between LP38690 and LP38692 base part numbers?

A: Both base part numbers (LP38690 and LP38692) deliver identical electrical performance for the 3.3V 1A output configuration. They are functionally equivalent within this specification set.

Q: Does packaging format affect electrical performance?

A: No. Packaging format (Cut Tape, Digi-Reel, or Tape & Reel) affects only procurement and assembly logistics. Electrical and thermal performance remain identical across all packaging options.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed carry RoHS3 compliance certification. The original LP38690SDX-3.3 is RoHS non-compliant and should be replaced with a compliant alternative for new designs.

Q: What is the significance of the /NOPB suffix?

A: The /NOPB suffix indicates "No Plumbum" (lead-free) packaging, confirming RoHS compliance and the absence of lead in solder and component materials.

Q: Can I use LP38692SDX-3.3/NOPB in place of LP38690SDX-3.3?

A: Yes. The LP38692SDX-3.3/NOPB is a direct functional equivalent with identical electrical specifications, package, and operating parameters. It is an active product with RoHS3 compliance.

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