LP38691SD-5.0/NOPB Equivalent & Substitute Parts

Part Overview

The LP38691SD-5.0/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output applications. This device delivers 500mA output current in a compact 6-WSON (3x3) surface mount package and is qualified to automotive standards (AEC-Q100). The part is currently active in production with 7100 units in stock. Substitute parts are identified when component availability is limited, supply chain disruptions occur, or inventory requirements necessitate alternative sourcing from the same manufacturer's product line.

Substiute Parts

LP38691SD-5.0/NOPB

Texas InstrumentsIn Stock: 7131LP38691SD-5.0/NOPB Datasheet

Current PartRFQ

LP38691QSD-5.0/NOPB

Texas InstrumentsIn Stock: 2023LP38691QSD-5.0/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The LP38691QSD-5.0/NOPB qualifies as a parametric equivalent substitute based on the following criteria:

Matching Electrical Parameters:

• Fixed output voltage: 5V
• Output current capacity: 500mA
• Maximum input voltage: 10V
• Voltage dropout: 0.45V @ 500mA
• Quiescent current: 55 µA
• PSRR: 55dB (120Hz)
• Protection features: Over Temperature

Matching Mechanical & Compliance Parameters:

• Package: 6-WSON (3x3) with exposed pad
• Surface mount configuration
• Automotive grade qualification: AEC-Q100
• Operating temperature range: -40°C to 125°C
• RoHS3 compliance
• Moisture sensitivity level: 1 (Unlimited)

Both parts share the same base product number (LP38691) and differ only in qualification or binning designation, making them functionally and mechanically interchangeable within the specified electrical operating envelope.

Parameter Comparison

Engineering Selection Recommendations

Both the LP38691SD-5.0/NOPB and LP38691QSD-5.0/NOPB are active production parts with full AEC-Q100 automotive qualification and ROHS3 compliance. Selection between these parts should be based on:

Primary Consideration: Inventory availability and supply chain lead times. The LP38691SD-5.0/NOPB maintains higher stock levels (7100 units), while the LP38691QSD-5.0/NOPB offers an alternative source (1932 units) when primary inventory is constrained.

Secondary Consideration: Both parts meet identical electrical and mechanical specifications, ensuring direct substitution without circuit redesign or performance degradation. The package footprint, thermal characteristics, and regulatory compliance are equivalent.

Compliance Status: Both parts maintain active production status with current certifications, ensuring long-term availability and supply chain stability for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can LP38691QSD-5.0/NOPB be used as a direct replacement for LP38691SD-5.0/NOPB?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters, including output voltage, current capacity, package type, and automotive qualification. No circuit modifications are required.

Q: Are there any differences in thermal performance between these parts?

A: No. Both parts share identical thermal specifications, voltage dropout characteristics (0.45V @ 500mA), and package configuration (6-WSON with exposed pad). Thermal performance in the application circuit will be equivalent.

Q: Do both parts meet automotive standards?

A: Yes. Both the LP38691SD-5.0/NOPB and LP38691QSD-5.0/NOPB carry AEC-Q100 qualification and are suitable for automotive-grade applications across the operating temperature range of -40°C to 125°C.

Q: What is the difference between the "SD" and "QSD" designations?

A: The designations reflect different qualification or binning levels within Texas Instruments' product line, but both parts meet identical electrical and mechanical specifications for this 5V 500mA regulator application.

Q: Are both parts RoHS compliant?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing.

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. Both parts use the same 6-WSON (3x3) package with identical pin configuration and footprint, allowing direct substitution in PCB designs without layout modifications.