LP38690DTX-3.3 Equivalent & Substitute Parts

Part Overview

The LP38690DTX-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output at 1A current capacity in a TO-252-3 surface mount package. This component is classified as obsolete, which necessitates identification of active equivalent parts for new designs and ongoing production requirements. The substitute part maintains identical electrical specifications and mechanical compatibility while offering improved availability and compliance status.

Substiute Parts

LP38690DTX-3.3

Texas InstrumentsIn Stock: 6898LP38690DTX-3.3 Datasheet

Current PartRFQ

LP38690DTX-3.3/NOPB

Texas InstrumentsIn Stock: 19462LP38690DTX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The LP38690DTX-3.3/NOPB qualifies as a parametric equivalent based on the following criteria:

Electrical Parameter Alignment:

• Output voltage: 3.3V (identical)
• Output current: 1A (identical)
• Input voltage maximum: 10V (identical)
• Voltage dropout: 1V @ 1A (identical)
• Quiescent current: 55 µA (identical)
• PSRR: 55dB (120Hz) (identical)
• Operating temperature range: -40°C ~ 125°C (identical)
• Protection features: Over Temperature (identical)

Mechanical Compatibility:

• Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63 (identical)
• Mounting type: Surface Mount (identical)
• Supplier device package: TO-252-3 (identical)

Functional Equivalence: Both parts are linear voltage regulators with positive fixed output configuration and single regulator topology. The substitute maintains all critical electrical and mechanical specifications required for direct replacement.

Parameter Comparison

Engineering Selection Recommendations

The LP38690DTX-3.3/NOPB is the direct active equivalent for the obsolete LP38690DTX-3.3. Selection of the substitute part is based on:

Product Status: The main part is classified as obsolete, making the active substitute necessary for continued component sourcing and new production designs.

Compliance Improvement: The substitute achieves ROHS3 compliance, addressing regulatory requirements for new applications. The main part is RoHS non-compliant.

Electrical Equivalence: All critical electrical parameters remain identical, ensuring functional compatibility in existing circuit designs without modification.

Packaging Compatibility: Both parts use identical TO-252-3 surface mount packages, allowing direct PCB layout reuse.

Moisture Sensitivity: The substitute has MSL 2 (1 Year) compared to MSL 1 (Unlimited) for the main part. This requires standard moisture control procedures during storage and handling but does not affect electrical performance.

Frequently Asked Questions (FAQ)

Q: Can LP38690DTX-3.3/NOPB be used as a direct replacement for LP38690DTX-3.3?

A: Yes. The substitute part maintains identical electrical specifications (3.3V output, 1A current, 1V dropout, 55dB PSRR, -40°C to 125°C operating range) and uses the same TO-252-3 package. No circuit modifications are required.

Q: What is the difference between these two part numbers?

A: The primary differences are product status and compliance. LP38690DTX-3.3 is obsolete and RoHS non-compliant. LP38690DTX-3.3/NOPB is active and ROHS3 compliant. The "/NOPB" suffix indicates lead-free plating. Electrical performance is identical.

Q: Are there packaging differences between these parts?

A: Both parts use TO-252-3 (DPAK with 2 Leads + Tab) surface mount packages. The main part is supplied in standard packaging, while the substitute is available in Cut Tape (CT) and Digi-Reel formats. PCB footprints are identical.

Q: What does MSL 2 (1 Year) mean for the substitute part?

A: Moisture Sensitivity Level 2 requires that the component be stored in controlled humidity conditions and used within one year of the manufacturing date if exposed to moisture. Standard moisture barrier bags and desiccant storage are recommended. This does not affect electrical performance or reliability in normal operating conditions.

Q: Is the substitute part suitable for new designs?

A: Yes. The LP38690DTX-3.3/NOPB is the active equivalent and is the appropriate choice for new designs. It provides improved compliance status and better long-term availability compared to the obsolete main part.