LP38690DT-1.8 Equivalent & Substitute Parts

Part Overview

The LP38690DT-1.8 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output at 1A current capacity in a TO-252-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across output voltage, current capacity, dropout voltage, and thermal characteristics while meeting modern compliance standards.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	1A
Input Voltage (Max)	10V
Dropout Voltage (Max)	1.6V @ 1A
Quiescent Current	55 µA
Operating Temperature Range	-40°C ~ 125°C
Package Type	TO-252-3 (DPAK)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the LP38690DT-1.8 are grouped based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Fixed output voltage of 1.8V
Output current rating of 1A minimum
TO-252-3 package compatibility (identical pinout and thermal characteristics)
Surface mount technology
Operating temperature range support for -40°C minimum

Acceptable Parameter Variations:

Input voltage maximum may exceed 10V (higher ratings are acceptable)
Quiescent current may differ (lower values are acceptable)
Dropout voltage specifications may vary if not explicitly stated
Protection features may be enhanced (over-current protection addition is acceptable)

Parts that do not meet the primary criteria are not suitable substitutes.

Parameter Comparison

Parameter	LP38690DT-1.8	LP38690DT-1.8/NOPB	BA18BC0FP-E2
Manufacturer	Texas Instruments	Texas Instruments	Rohm Semiconductor
Product Status	Obsolete	Active	Active
Output Voltage	1.8V	1.8V	1.8V
Output Current	1A	1A	1A
Input Voltage (Max)	10V	10V	16V
Dropout Voltage (Max)	1.6V @ 1A	1.6V @ 1A	Not specified
Quiescent Current	55 µA	55 µA	0.5 mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 105°C
Package	TO-252-3	TO-252-3	TO-252-3
Protection Features	Over Temperature	Over Temperature	Over Current, Over Temperature
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	1103 Pcs	978 Pcs	36299 Pcs

Engineering Selection Recommendations

LP38690DT-1.8/NOPB (Texas Instruments): This part is the direct equivalent of the obsolete LP38690DT-1.8, maintaining identical electrical specifications and package configuration. The primary distinction is product status (active vs. obsolete) and RoHS3 compliance. This part is recommended for designs requiring exact electrical and thermal performance matching, with the added benefit of current manufacturing availability and modern compliance certification.

BA18BC0FP-E2 (Rohm Semiconductor): This part meets all primary substitution criteria with identical output voltage, current rating, and package type. The higher input voltage rating (16V vs. 10V) provides additional design margin. Enhanced protection features include over-current protection in addition to over-temperature protection. The maximum operating temperature is limited to 105°C compared to 125°C for the Texas Instruments parts. This part is suitable for applications where the reduced temperature range is acceptable and where higher input voltage tolerance is beneficial. Significantly higher inventory availability supports supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the BA18BC0FP-E2 replace the LP38690DT-1.8 in all applications?

A: The BA18BC0FP-E2 is electrically compatible for the specified output voltage and current. The maximum operating temperature of 105°C versus 125°C for the original part may be a limiting factor in high-temperature environments. Verify that your application does not require operation above 105°C before substitution.

Q: What is the difference between LP38690DT-1.8 and LP38690DT-1.8/NOPB?

A: Both parts are identical in electrical performance and package configuration. The /NOPB designation indicates lead-free (no lead) manufacturing and RoHS3 compliance. The original part is classified as obsolete, while the /NOPB variant is active and currently manufactured.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the TO-252-3 (DPAK) package with identical pinout and thermal pad configuration, enabling direct PCB substitution without layout modifications.

Q: Does the higher quiescent current of the BA18BC0FP-E2 affect circuit performance?

A: The BA18BC0FP-E2 has a quiescent current of 0.5 mA compared to 55 µA for the Texas Instruments parts. This difference is significant in battery-powered or ultra-low-power applications where quiescent current is a critical design parameter. For standard applications, this difference is typically negligible.

Q: Which part should be selected for new designs?

A: For new designs, select LP38690DT-1.8/NOPB if the full -40°C to 125°C temperature range and lower quiescent current are required. Select BA18BC0FP-E2 if the -40°C to 105°C range is acceptable and enhanced over-current protection is beneficial. Both parts are active and support long-term supply chain availability.

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