LP38693SD-3.3 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP38693SD-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications. This automotive-grade device delivers 500mA output current in a compact 6-WSON (3x3) surface mount package. The main part number is currently in Last Time Buy status, making identification of equivalent and substitute parts essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	500mA
Input Voltage (Max)	10V
Voltage Dropout (Max)	0.55V @ 500mA
Quiescent Current	55 µA
PSRR	55dB (120Hz)
Operating Temperature Range	-40°C ~ 125°C
Package	6-WSON (3x3)
Automotive Grade	AEC-Q100
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the LP38693SD-3.3 is determined by the following critical parameters: fixed 3.3V output voltage, 500mA output current capability, maximum 10V input voltage rating, automotive AEC-Q100 qualification, and 6-WSON (3x3) package footprint compatibility.

Parametric equivalents maintain identical electrical specifications and package dimensions, ensuring direct form-fit-function replacement. The manufacturer-recommended substitute from onsemi (NCP606MN33T2G) meets the core functional requirements but operates within a reduced maximum input voltage specification (6V versus 10V) and exhibits different quiescent current characteristics.

Parameter Comparison

Parameter	LP38693SD-3.3	LP38693QSD-3.3/NOPB	LP38693QSDX-3.3/NOPB	LP38693SD-3.3/NOPB	NCP606MN33T2G
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	onsemi
Output Voltage	3.3V	3.3V	3.3V	3.3V	3.3V
Output Current	500mA	500mA	500mA	500mA	500mA
Input Voltage (Max)	10V	10V	10V	10V	6V
Voltage Dropout (Max)	0.55V @ 500mA	0.55V @ 500mA	0.55V @ 500mA	0.55V @ 500mA	0.22V @ 500mA
Quiescent Current	55 µA	55 µA	55 µA	55 µA	180 µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package	6-WSON (3x3)	6-WSON (3x3)	6-WSON (3x3)	6-WSON (3x3)	6-DFN (3x3.3)
AEC-Q100	Yes	Yes	Yes	Yes	Not specified
Product Status	Last Time Buy	Active	Active	Active	Active

Engineering Selection Recommendations

For direct replacement of LP38693SD-3.3 in active production designs, select from the Texas Instruments parametric equivalents: LP38693QSD-3.3/NOPB, LP38693QSDX-3.3/NOPB, or LP38693SD-3.3/NOPB. All three maintain identical electrical performance, automotive qualification, and package compatibility. These parts are in Active product status with established supply availability.

The onsemi NCP606MN33T2G is a manufacturer-recommended alternative that meets the 3.3V output and 500mA current requirements. However, this part operates with a maximum input voltage of 6V (versus 10V for the LP38693 series) and exhibits higher quiescent current (180 µA versus 55 µA). Circuit designs must accommodate these parameter differences. The NCP606MN33T2G package is 6-DFN (3x3.3), which differs slightly from the 6-WSON (3x3) footprint and requires PCB layout verification.

Frequently Asked Questions (FAQ)

Q: Can LP38693QSD-3.3/NOPB directly replace LP38693SD-3.3?

A: Yes. Both parts are Texas Instruments LP38693 series regulators with identical electrical specifications, automotive AEC-Q100 qualification, and 6-WSON (3x3) package. The primary difference is packaging format: LP38693QSD-3.3/NOPB is supplied in Tape & Reel format, while LP38693SD-3.3 is Last Time Buy status. Electrical performance and PCB footprint are equivalent.

Q: What is the difference between LP38693QSDX-3.3/NOPB and LP38693QSD-3.3/NOPB?

A: Both parts share identical electrical specifications and package dimensions. The suffix variation indicates different manufacturing or qualification batches within the Texas Instruments LP38693 product line. Both are Active status with full AEC-Q100 automotive qualification.

Q: Can NCP606MN33T2G be used as a drop-in replacement?

A: NCP606MN33T2G is functionally compatible for 3.3V, 500mA applications but is not a direct drop-in replacement. The maximum input voltage is limited to 6V (versus 10V), quiescent current is higher at 180 µA (versus 55 µA), and the package footprint differs (6-DFN 3x3.3 versus 6-WSON 3x3). Circuit designs operating above 6V input voltage cannot use this part. PCB layout changes are required due to package differences.

Q: Why is LP38693SD-3.3 in Last Time Buy status?

A: Last Time Buy status indicates the manufacturer is discontinuing this specific part number variant. Texas Instruments continues to offer equivalent alternatives in the LP38693 series (QSD and QSDX variants) in Active status with identical performance specifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. LP38693QSD-3.3/NOPB, LP38693QSDX-3.3/NOPB, LP38693SD-3.3/NOPB, and NCP606MN33T2G are all ROHS3 compliant.

Q: What is the inventory status for these parts?

A: LP38693SD-3.3/NOPB has the highest availability at 20,200 pieces. LP38693QSDX-3.3/NOPB has 2,100 pieces available. LP38693QSD-3.3/NOPB has 704 pieces. NCP606MN33T2G has 1,700 pieces. Availability is subject to change and should be verified with your supplier.

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