LP38690DT-3.3 Equivalent & Substitute Parts

Part Overview

The LP38690DT-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications. This Surface Mount device delivers 1A output current with a maximum dropout voltage of 1V at rated load, making it suitable for low-power supply regulation in embedded systems and portable electronics. The part is currently in Last Time Buy status, necessitating identification of equivalent alternatives for continued design support and procurement planning.

Substiute Parts

LP38690DT-3.3

Texas InstrumentsIn Stock: 1741LP38690DT-3.3 Datasheet

Current PartRFQ

LP38690DT-3.3/NOPB

National SemiconductorIn Stock: 1477LP38690DT-3.3/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP38690DT-3.3 is determined by strict equivalence across the following critical parameters:

• Fixed output voltage of 3.3V
• Output current capability of 1A minimum
• Maximum input voltage rating of 10V or greater
• Maximum dropout voltage of 1V or less at 1A load
• Surface Mount packaging in TO-252-3 configuration
• Operating temperature range of -40°C to 125°C or wider
• Over Temperature protection feature
• RoHS3 compliance and EAR99 export classification

The LP38690DT-3.3/NOPB variant meets all these criteria and qualifies as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The LP38690DT-3.3/NOPB is a direct functional equivalent to the LP38690DT-3.3. Both parts share identical electrical specifications, package configuration, and compliance certifications. The primary distinction is product lifecycle status: the original part is in Last Time Buy phase while the substitute remains in Active production status. For new designs or long-term procurement requirements, the LP38690DT-3.3/NOPB is the appropriate selection due to its continued availability and active manufacturer support. Both parts maintain ROHS3 compliance and EAR99 export classification, ensuring regulatory consistency in applications.

Frequently Asked Questions (FAQ)

Q: Can LP38690DT-3.3/NOPB be used as a direct replacement for LP38690DT-3.3?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters, including output voltage, current rating, dropout voltage, quiescent current, PSRR, operating temperature range, and package configuration. Pin-for-pin compatibility is maintained.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" designation indicates the part is supplied without lead-free plating on the leads. This is a packaging variant that does not affect electrical performance or functional compatibility.

Q: Why is the original LP38690DT-3.3 in Last Time Buy status?

A: Last Time Buy status indicates the manufacturer is discontinuing production. Customers are advised to place final orders during this period. The LP38690DT-3.3/NOPB remains in Active production and should be selected for new designs.

Q: Are there any thermal or reliability differences between these parts?

A: No. Both parts share identical thermal characteristics, operating temperature range, and protection features. Reliability and thermal performance are equivalent.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. The TO-252-3 package footprint is identical for both parts. No PCB layout modifications are required for substitution.

Q: What compliance certifications apply to both parts?

A: Both parts are ROHS3 compliant and classified as EAR99 for export purposes. REACH status is Unaffected for both variants.