LP38693SDX-3.3 Linear Voltage Regulator — Equivalent & Substitute Parts

Part Overview

The LP38693SDX-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed 3.3V output at 500mA with a maximum input voltage of 10V and dropout voltage of 0.55V at full load. The device is qualified to AEC-Q100 automotive standards and features over-temperature protection.

The LP38693SDX-3.3 is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this regulator.

Substiute Parts

LP38693SDX-3.3

Texas InstrumentsIn Stock: 677LP38693SDX-3.3 Datasheet

Current PartRFQ

LP38693SDX-3.3/NOPB

Texas InstrumentsIn Stock: 1055LP38693SDX-3.3/NOPB Datasheet

DirectRFQ

LP38691QSD-3.3/NOPB

Texas InstrumentsIn Stock: 4862LP38691QSD-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP38691QSDX-3.3/NOPB

Texas InstrumentsIn Stock: 2475LP38691QSDX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP38691SD-3.3/NOPB

Texas InstrumentsIn Stock: 10151LP38691SD-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP38691SDX-3.3/NOPB

Texas InstrumentsIn Stock: 21873LP38691SDX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

NCP606MN33T2G

onsemiIn Stock: 1722NCP606MN33T2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP38693SDX-3.3 are grouped into two categories based on substitution criteria:

Direct Manufacturer Substitutes (Texas Instruments LP38693/LP38691 Series)

These parts share identical electrical specifications with the main part: 3.3V fixed output, 500mA output current, 10V maximum input voltage, 0.55V dropout voltage at 500mA, 55 µA quiescent current, 55dB PSRR, over-temperature protection, -40°C to 125°C operating range, AEC-Q100 qualification, and 6-WSON (3x3) packaging. Substitution is valid based on matching output voltage, output current, input voltage rating, dropout voltage, quiescent current, PSRR, protection features, temperature range, automotive grade, and package type.

The LP38693SDX-3.3/NOPB differs only in packaging format (Tape & Reel vs. bulk) and RoHS compliance status (ROHS3 Compliant vs. non-compliant). The LP38691 series variants (LP38691QSD-3.3/NOPB, LP38691QSDX-3.3/NOPB, LP38691SD-3.3/NOPB, LP38691SDX-3.3/NOPB) are parametrically equivalent, sharing all critical electrical and mechanical specifications, with differences limited to packaging format and product status (all active).

Manufacturer-Recommended Alternative (onsemi NCP606MN33T2G)

The NCP606MN33T2G from onsemi is a manufacturer-recommended alternative. While it maintains the same output voltage (3.3V), output current (500mA), operating temperature range (-40°C to 125°C), and surface-mount 6-DFN (3x3.3) package, it differs in the following parameters: maximum input voltage is 6V (vs. 10V), dropout voltage is 0.22V @ 500mA (vs. 0.55V), quiescent current is 180 µA (vs. 55 µA), and it includes Enable control and Short Circuit protection features. The NCP606MN33T2G is ROHS3 compliant and carries AEC-Q100 qualification.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution (Texas Instruments LP38693/LP38691 Series)

The LP38693SDX-3.3/NOPB, LP38691QSD-3.3/NOPB, LP38691QSDX-3.3/NOPB, LP38691SD-3.3/NOPB, and LP38691SDX-3.3/NOPB are all active products with identical electrical and mechanical specifications to the obsolete LP38693SDX-3.3. All variants maintain AEC-Q100 automotive qualification and -40°C to 125°C operating range. The primary differences are product status (all active vs. obsolete) and RoHS compliance (ROHS3 Compliant vs. non-compliant). LP38691SDX-3.3/NOPB offers the highest inventory availability (21,800 pcs) and is recommended for new designs and production continuity.

For Alternative Substitution (onsemi NCP606MN33T2G)

The NCP606MN33T2G is suitable only when design constraints permit the following parameter deviations: maximum input voltage of 6V (vs. 10V), lower dropout voltage of 0.22V @ 500mA (vs. 0.55V), higher quiescent current of 180 µA (vs. 55 µA), and the addition of Enable control and Short Circuit protection. This part is ROHS3 compliant and AEC-Q100 qualified. Selection of the NCP606MN33T2G requires circuit-level review to confirm compatibility with the reduced input voltage rating and increased quiescent current.

Frequently Asked Questions (FAQ)

Q: Can LP38691SDX-3.3/NOPB be used as a direct replacement for LP38693SDX-3.3?

A: Yes. The LP38691SDX-3.3/NOPB is parametrically equivalent to the LP38693SDX-3.3, sharing identical output voltage (3.3V), output current (500mA), input voltage rating (10V), dropout voltage (0.55V @ 500mA), quiescent current (55 µA), PSRR (55dB), protection features (over-temperature), operating temperature range (-40°C to 125°C), automotive grade, AEC-Q100 qualification, and 6-WSON (3x3) package. The primary advantage is that LP38691SDX-3.3/NOPB is an active product with ROHS3 compliance and significantly higher inventory availability.

Q: What are the key differences between the LP38693/LP38691 series and the NCP606MN33T2G?

A: The NCP606MN33T2G differs in three critical parameters: (1) maximum input voltage is 6V instead of 10V, (2) dropout voltage is 0.22V @ 500mA instead of 0.55V, and (3) quiescent current is 180 µA instead of 55 µA. The NCP606MN33T2G also includes Enable control and Short Circuit protection features not present in the LP38693/LP38691 series. These differences require circuit-level evaluation before substitution.

Q: Are all substitute parts automotive-qualified?

A: Yes. All substitute parts listed—LP38693SDX-3.3/NOPB, LP38691QSD-3.3/NOPB, LP38691QSDX-3.3/NOPB, LP38691SD-3.3/NOPB, LP38691SDX-3.3/NOPB, and NCP606MN33T2G—carry AEC-Q100 qualification and support the -40°C to 125°C automotive operating temperature range.

Q: What is the difference between packaging formats (Tape & Reel vs. Cut Tape)?

A: Tape & Reel (TR) packaging is used for high-volume automated assembly. Cut Tape (CT) & Digi-Reel® packaging is used for lower-volume or manual assembly operations. Electrical and mechanical specifications are identical; the difference is in supply format and handling.

Q: Why is RoHS compliance status different between LP38693SDX-3.3 and its substitutes?

A: The original LP38693SDX-3.3 is listed as RoHS non-compliant. All active substitute parts (LP38693SDX-3.3/NOPB, LP38691 series, and NCP606MN33T2G) are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and production.

Q: Can the NCP606MN33T2G be used in applications requiring 10V input?

A: No. The NCP606MN33T2G has a maximum input voltage rating of 6V. Applications requiring 10V input must use the LP38693/LP38691 series, which are rated for 10V maximum input voltage.

Q: Which substitute part has the best inventory availability?

A: LP38691SDX-3.3/NOPB has the highest inventory availability at 21,800 pcs, followed by LP38691SD-3.3/NOPB at 10,100 pcs. Both are recommended for production continuity and new designs.