LP38693SDX-5.0 Equivalent & Substitute Parts

Part Overview

The LP38693SDX-5.0 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 5V output at 500mA with a maximum dropout voltage of 0.45V, housed in a 6-WSON (3x3) surface mount package. The device is qualified to AEC-Q100 automotive standards and operates across -40°C to 125°C.

The LP38693SDX-5.0 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 requiring this voltage regulation topology.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	500mA
Input Voltage (Max)	10V
Dropout Voltage (Max)	0.45V @ 500mA
Quiescent Current	55 µA
PSRR	55dB (120Hz)
Operating Temperature Range	-40°C to 125°C
Package	6-WSON (3x3)
Grade	Automotive
Qualification	AEC-Q100

Substitute Part Grouping Explanation

Substitute parts for the LP38693SDX-5.0 are classified into three categories based on electrical and mechanical compatibility:

Direct Manufacturer Substitutes (Pin-Compatible, Same Electrical Performance): Parts that share identical electrical specifications, package type, and manufacturer lineage. These include LP38693SDX-5.0/NOPB (active product status with RoHS3 compliance).

Parametric Equivalents (Identical Electrical Performance, Same Package Family): Parts meeting all critical electrical parameters: 5V fixed output, 500mA output current, 10V maximum input voltage, 0.45V maximum dropout voltage, 55 µA quiescent current, and 6-WSON package compatibility. These include LP38691QSD-5.0/NOPB, LP38691QSDX-5.0/NOPB, LP38691SD-5.0/NOPB, and LP38691SDX-5.0/NOPB. All maintain AEC-Q100 automotive qualification and -40°C to 125°C operating range.

Manufacturer Recommended Alternative (Different Input Voltage Specification): The NCP606MN50T2G from onsemi meets output voltage, output current, and package footprint requirements but operates with a maximum input voltage of 6V (versus 10V for the LP38693SDX-5.0). This part is suitable only for applications where input voltage does not exceed 6V.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	RoHS Status	Inventory
LP38693SDX-5.0	Texas Instruments	Obsolete	5V	500mA	10V	0.45V @ 500mA	55 µA	6-WSON (3x3)	Non-compliant	765 Pcs
LP38693SDX-5.0/NOPB	Texas Instruments	Active	5V	500mA	10V	0.45V @ 500mA	55 µA	6-WSON (3x3)	RoHS3 Compliant	7700 Pcs
LP38691QSD-5.0/NOPB	Texas Instruments	Active	5V	500mA	10V	0.45V @ 500mA	55 µA	6-WSON (3x3)	RoHS3 Compliant	1932 Pcs
LP38691QSDX-5.0/NOPB	National Semiconductor	Active	5V	500mA	10V	0.45V @ 500mA	55 µA	6-WSON (3x3)	Not specified	87622 Pcs
LP38691SD-5.0/NOPB	Texas Instruments	Active	5V	500mA	10V	0.45V @ 500mA	55 µA	6-WSON (3x3)	RoHS3 Compliant	7100 Pcs
LP38691SDX-5.0/NOPB	Texas Instruments	Active	5V	500mA	10V	0.45V @ 500mA	55 µA	6-WSON (3x3)	RoHS3 Compliant	4800 Pcs
NCP606MN50T2G	onsemi	Active	5V	500mA	6V	0.2V @ 500mA	180 µA	6-DFN (3x3.3)	RoHS3 Compliant	1780 Pcs

Engineering Selection Recommendations

Primary Recommendation: LP38693SDX-5.0/NOPB

This part is the direct active equivalent of the obsolete LP38693SDX-5.0. It maintains identical electrical specifications, package footprint, and automotive qualification (AEC-Q100). The part carries RoHS3 compliance and has the highest inventory availability (7700 Pcs), ensuring supply continuity. This is the preferred choice for direct replacement in existing designs.

Secondary Recommendations: LP38691 Series (QSD, QSDX, SD, SDX variants)

All LP38691 variants meet identical electrical performance criteria and maintain AEC-Q100 automotive qualification. These parts are active products with RoHS3 compliance. Selection among these variants depends on packaging requirements: tape & reel (TR) packaging is available for LP38691QSD-5.0/NOPB and LP38691SD-5.0/NOPB; bulk packaging is available for LP38691QSDX-5.0/NOPB. The LP38691QSDX-5.0/NOPB variant offers the highest inventory level (87622 Pcs).

Alternative Consideration: NCP606MN50T2G

The NCP606MN50T2G from onsemi is suitable only for applications where the maximum input voltage requirement does not exceed 6V. This part offers improved dropout voltage performance (0.2V versus 0.45V) but operates with higher quiescent current (180 µA versus 55 µA). The package footprint differs slightly (6-DFN 3x3.3 versus 6-WSON 3x3), requiring PCB layout verification. This option is not recommended as a direct replacement but may be considered for new designs with compatible input voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can LP38691 series parts directly replace the LP38693SDX-5.0?

A: Yes. The LP38691 series parts (QSD, QSDX, SD, SDX variants) are parametric equivalents with identical output voltage (5V), output current (500mA), input voltage rating (10V maximum), dropout voltage (0.45V @ 500mA), and package type (6-WSON 3x3). All maintain AEC-Q100 automotive qualification and -40°C to 125°C operating temperature range. The primary difference is product status: LP38691 variants are active products with RoHS3 compliance, whereas the LP38693SDX-5.0 is obsolete.

Q: What is the difference between LP38693SDX-5.0 and LP38693SDX-5.0/NOPB?

A: The LP38693SDX-5.0/NOPB is the active equivalent of the obsolete LP38693SDX-5.0. The "/NOPB" suffix indicates "No Plumbum" (lead-free) and RoHS3 compliance. Electrical specifications and package type are identical. The LP38693SDX-5.0/NOPB is the recommended direct replacement.

Q: Can the NCP606MN50T2G be used as a substitute?

A: The NCP606MN50T2G is suitable only if your application's maximum input voltage does not exceed 6V. The LP38693SDX-5.0 is rated for 10V maximum input voltage. If your design requires higher input voltage tolerance, the NCP606MN50T2G is not compatible. Additionally, the package footprint differs slightly (6-DFN 3x3.3 versus 6-WSON 3x3), requiring PCB layout verification.

Q: What packaging options are available for LP38691 substitutes?

A: LP38691QSD-5.0/NOPB and LP38691SD-5.0/NOPB are available in Tape & Reel (TR) packaging. LP38691QSDX-5.0/NOPB is available in bulk packaging. LP38691SDX-5.0/NOPB packaging is not specified in available data. Verify packaging requirements with your procurement process before selection.

Q: Are all substitute parts AEC-Q100 qualified?

A: Yes. All LP38691 series variants (QSD, QSDX, SD, SDX) and the NCP606MN50T2G maintain AEC-Q100 automotive qualification. This ensures compatibility with automotive-grade applications.

Q: What is the inventory status for each substitute?

A: LP38693SDX-5.0/NOPB: 7700 Pcs; LP38691QSD-5.0/NOPB: 1932 Pcs; LP38691QSDX-5.0/NOPB: 87622 Pcs (highest availability); LP38691SD-5.0/NOPB: 7100 Pcs; LP38691SDX-5.0/NOPB: 4800 Pcs; NCP606MN50T2G: 1780 Pcs.

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