LP38691SD-5.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP38691SD-5.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 500mA in a 6-WSON (3x3) surface mount package. This part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The LP38691SD-5.0 operates across an automotive temperature range of -40°C to 125°C with AEC-Q100 qualification, suitable for automotive-grade applications requiring regulated 5V power delivery with low dropout voltage and integrated over-temperature protection.

Substiute Parts

LP38691SD-5.0

Texas InstrumentsIn Stock: 1218LP38691SD-5.0 Datasheet

Current PartRFQ

LP38691SD-5.0/NOPB

Texas InstrumentsIn Stock: 7131LP38691SD-5.0/NOPB Datasheet

DirectRFQ

LP38691QSD-5.0/NOPB

Texas InstrumentsIn Stock: 2023LP38691QSD-5.0/NOPB Datasheet

Parametric EquivalentRFQ

LP38691QSDX-5.0/NOPB

National SemiconductorIn Stock: 87683LP38691QSDX-5.0/NOPB Datasheet

Parametric EquivalentRFQ

LP38691SDX-5.0/NOPB

Texas InstrumentsIn Stock: 4899LP38691SDX-5.0/NOPB Datasheet

Parametric EquivalentRFQ

LP38693SDX-5.0/NOPB

Texas InstrumentsIn Stock: 7791LP38693SDX-5.0/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP38691SD-5.0 are qualified based on identical electrical and mechanical parameters across all critical specifications. The substitution logic is based on the following key parameters:

• Output voltage: 5V fixed
• Output current capability: 500mA
• Maximum input voltage: 10V
• Dropout voltage: 0.45V @ 500mA
• Quiescent current: 55 µA
• PSRR: 55dB (120Hz)
• Operating temperature range: -40°C to 125°C
• Package type: 6-WSON (3x3) with exposed pad
• Automotive grade with AEC-Q100 qualification
• Over-temperature protection

All substitute parts listed maintain these electrical and mechanical specifications, ensuring functional equivalence for direct replacement in existing designs.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain identical electrical specifications and automotive-grade qualification. Selection should prioritize parts with Active product status to ensure long-term availability and supply chain continuity.

LP38691SD-5.0/NOPB is the direct equivalent with ROHS3 compliance and highest inventory availability (7100 Pcs), making it the primary substitute for the obsolete LP38691SD-5.0.

LP38691QSD-5.0/NOPB and LP38691SDX-5.0/NOPB are parametric equivalents with ROHS3 compliance and Active status, suitable for applications where the specific suffix variant is not design-critical.

LP38693SDX-5.0/NOPB represents an alternative base product number (LP38693 vs LP38691) while maintaining all electrical and mechanical specifications. This part carries the highest inventory (7700 Pcs) and is suitable for new designs or redesigns where the base product number change is acceptable.

LP38691QSDX-5.0/NOPB from National Semiconductor is a parametric equivalent with substantial inventory (87622 Pcs). RoHS compliance status is not specified for this part.

Frequently Asked Questions (FAQ)

Q: Can LP38691SD-5.0/NOPB directly replace the obsolete LP38691SD-5.0?

A: Yes. LP38691SD-5.0/NOPB is the direct equivalent with identical electrical and mechanical specifications. The primary difference is Active product status and ROHS3 compliance versus the obsolete RoHS non-compliant original part.

Q: What is the difference between LP38691 and LP38693 base product numbers?

A: Both LP38691 and LP38693 variants maintain identical electrical specifications for 5V 500mA output. The base product number difference does not affect functional equivalence. LP38693SDX-5.0/NOPB is suitable for applications where the base product number change is acceptable.

Q: Are all substitute parts qualified for automotive applications?

A: Yes. All listed substitute parts carry AEC-Q100 qualification and automotive-grade designation, maintaining the same qualification level as the original LP38691SD-5.0.

Q: What does the suffix variation (SD, QSD, SDX, QSDX) indicate?

A: Suffix variations indicate different manufacturing or packaging designations within the same electrical specification family. All variants listed maintain identical electrical performance and package type (6-WSON 3x3).

Q: Is the 6-WSON (3x3) package identical across all substitute parts?

A: Yes. All substitute parts use the 6-WDFN Exposed Pad package, equivalent to 6-WSON (3x3), ensuring mechanical and thermal compatibility for direct PCB replacement.

Q: Which substitute part offers the best inventory availability?

A: LP38691QSDX-5.0/NOPB from National Semiconductor offers the highest inventory at 87622 Pcs. LP38693SDX-5.0/NOPB from Texas Instruments provides 7700 Pcs with confirmed ROHS3 compliance.