LP38690DTX-1.8 Equivalent & Substitute Parts

Part Overview

The LP38690DTX-1.8 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed positive 1.8V output at 1A current capacity in a TO-252-3 surface mount package. The part is currently listed as obsolete, making identification of equivalent and substitute parts essential for ongoing design support, maintenance, and production continuity.

Substiute Parts

LP38690DTX-1.8

Texas InstrumentsIn Stock: 755LP38690DTX-1.8 Datasheet

Current PartRFQ

LP38690DTX-1.8/NOPB

National SemiconductorIn Stock: 3096LP38690DTX-1.8/NOPB Datasheet

Parametric EquivalentRFQ

BA18BC0FP-E2

Rohm SemiconductorIn Stock: 36377BA18BC0FP-E2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP38690DTX-1.8 are identified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

• Fixed output voltage of 1.8V
• Output current capacity of 1A minimum
• Positive output configuration
• TO-252-3 package compatibility
• Surface mount mounting type
• Operating temperature range overlap with -40°C to 125°C

Two substitute parts meet these core requirements:

1. LP38690DTX-1.8/NOPB — Parametric equivalent with identical electrical specifications and packaging
2. BA18BC0FP-E2 — Manufacturer-recommended alternative with compatible electrical performance and enhanced feature set

Parameter Comparison

Engineering Selection Recommendations

LP38690DTX-1.8/NOPB is the direct parametric equivalent. This part maintains identical electrical specifications, identical quiescent current, identical PSRR performance, and identical operating temperature range. The primary distinction is product status: this variant is active and available, whereas the original part is obsolete. Selection of this part ensures no design modification is required.

BA18BC0FP-E2 is the manufacturer-recommended alternative from Rohm Semiconductor. This part meets all core electrical requirements with the following considerations:

• Maximum input voltage is 16V versus 10V on the original, providing greater input voltage margin
• Quiescent current is 0.5 mA versus 55 µA, representing higher standby current consumption
• Operating temperature maximum is 105°C versus 125°C, reducing the upper temperature margin by 20°C
• Includes over-current protection in addition to over-temperature protection
• ROHS3 compliant, whereas the original part is RoHS non-compliant

Selection of BA18BC0FP-E2 is appropriate for applications where higher input voltage tolerance and enhanced protection features justify the trade-offs in quiescent current and maximum operating temperature.

Frequently Asked Questions (FAQ)

Q: Can LP38690DTX-1.8/NOPB be used as a direct replacement for LP38690DTX-1.8?

A: Yes. The LP38690DTX-1.8/NOPB is a parametric equivalent with identical electrical specifications, identical output voltage, identical output current, identical dropout voltage, identical quiescent current, and identical PSRR. Both parts use the TO-252-3 package. The primary difference is product status and availability.

Q: What are the key differences between LP38690DTX-1.8 and BA18BC0FP-E2?

A: Both parts deliver 1.8V fixed output at 1A in TO-252-3 packages. The BA18BC0FP-E2 accepts higher input voltage (16V maximum versus 10V), includes over-current protection, and is ROHS3 compliant. The BA18BC0FP-E2 has higher quiescent current (0.5 mA versus 55 µA) and lower maximum operating temperature (105°C versus 125°C).

Q: Are the packages physically identical?

A: Yes. Both the LP38690DTX-1.8 and BA18BC0FP-E2 use the TO-252-3 package, also designated as DPAK (2 Leads + Tab) or SC-63. PCB layout and thermal management considerations remain unchanged.

Q: Which substitute part should be selected for new designs?

A: Selection depends on application requirements. For direct replacement with no design changes, use LP38690DTX-1.8/NOPB. For applications requiring higher input voltage tolerance, enhanced protection, or RoHS3 compliance, use BA18BC0FP-E2, accounting for the higher quiescent current and reduced maximum operating temperature.

Q: Is the LP38690DTX-1.8/NOPB available in the same packaging options as the original?

A: The LP38690DTX-1.8/NOPB is supplied in Bulk packaging, whereas the original part packaging is not specified. Both parts use the TO-252-3 supplier device package. Verify packaging and tape specifications with your supplier for production requirements.