LP38693SD-1.8 Equivalent & Substitute Parts

Part Overview

The LP38693SD-1.8 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 1.8V output at 500mA with automotive-grade qualification (AEC-Q100) and operates across the temperature range of -40°C to 125°C. The main part is currently in Last Time Buy status, making identification of active equivalent alternatives essential for ongoing design support and procurement planning.

Substiute Parts

LP38693SD-1.8

Texas InstrumentsIn Stock: 1623LP38693SD-1.8 Datasheet

Current PartRFQ

LP38693QSD-1.8/NOPB

Texas InstrumentsIn Stock: 10420LP38693QSD-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP38693QSDX-1.8/NOPB

Texas InstrumentsIn Stock: 785LP38693QSDX-1.8/NOPB Datasheet

Parametric EquivalentRFQ

LP38693SD-1.8/NOPB

National SemiconductorIn Stock: 11226LP38693SD-1.8/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP38693SD-1.8 is determined by strict equivalence across the following parameters: fixed output voltage of 1.8V, output current rating of 500mA, maximum input voltage of 10V, quiescent current of 55 µA, PSRR of 55dB at 120Hz, 6-WSON (3x3) package configuration, automotive grade classification, and AEC-Q100 qualification. All identified substitutes maintain identical electrical specifications and mechanical packaging, ensuring direct functional interchangeability. Differences in product status, packaging format (Cut Tape vs. Bulk vs. Tape & Reel), and RoHS/REACH compliance are noted but do not affect electrical performance or pin compatibility.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing procurement, LP38693QSD-1.8/NOPB and LP38693QSDX-1.8/NOPB are the preferred alternatives, as both maintain Active product status with Texas Instruments. These parts carry identical electrical and mechanical specifications to the main part, ensuring drop-in compatibility. LP38693QSDX-1.8/NOPB is available in Tape & Reel format, suitable for high-volume automated assembly. LP38693QSD-1.8/NOPB is supplied in Bulk packaging, appropriate for lower-volume or manual assembly operations.

LP38693SD-1.8/NOPB from National Semiconductor represents a legacy equivalent with identical parametric specifications and automotive qualification. This part remains Active but should be evaluated for supply chain continuity given the original part's Last Time Buy status.

All substitutes are qualified to AEC-Q100 and operate within the same temperature range, making them suitable for automotive applications requiring the same thermal and reliability performance as the original LP38693SD-1.8.

Frequently Asked Questions (FAQ)

Q: Can LP38693QSD-1.8/NOPB be used as a direct replacement for LP38693SD-1.8?

A: Yes. Both parts share identical electrical specifications (1.8V output, 500mA current, 55 µA quiescent current, 55dB PSRR), the same 6-WSON (3x3) package, automotive grade, and AEC-Q100 qualification. The primary difference is packaging format (Bulk vs. Cut Tape) and product status (Active vs. Last Time Buy).

Q: What is the difference between LP38693QSDX-1.8/NOPB and LP38693QSD-1.8/NOPB?

A: Both parts are electrically and mechanically identical. The difference lies in packaging format: LP38693QSDX-1.8/NOPB is supplied in Tape & Reel (TR) format for automated assembly, while LP38693QSD-1.8/NOPB is supplied in Bulk format. Both are Active products from Texas Instruments.

Q: Is the National Semiconductor LP38693SD-1.8/NOPB compatible with the original Texas Instruments part?

A: Yes. The National Semiconductor part maintains identical parametric specifications, package configuration, and automotive qualification. However, verify supply chain availability and lead times, as this represents a legacy product line.

Q: Why is the original LP38693SD-1.8 marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing production. Customers should transition to active alternatives such as LP38693QSD-1.8/NOPB or LP38693QSDX-1.8/NOPB to ensure long-term supply continuity.

Q: Are all substitute parts RoHS compliant?

A: LP38693QSDX-1.8/NOPB is explicitly ROHS3 Compliant. RoHS status for LP38693QSD-1.8/NOPB and LP38693SD-1.8/NOPB is not specified in available documentation. Verify compliance requirements with your procurement or quality department.

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

A: Yes. All parts use the identical 6-WSON (3x3) package with the same pinout and exposed pad configuration, allowing direct PCB layout reuse without modification.