LP38842S-1.2 Equivalent & Substitute Parts

Part Overview

The LP38842S-1.2 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive output of 1.2V at 1.5A in a TO-263 (DDPAK-5) surface mount package. The main part number is currently listed as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and component procurement.

Substiute Parts

LP38842S-1.2

Texas InstrumentsIn Stock: 5456LP38842S-1.2 Datasheet

Current PartRFQ

LP38842S-1.2/NOPB

Texas InstrumentsIn Stock: 1304LP38842S-1.2/NOPB Datasheet

DirectRFQ

LP3892ES-1.2/NOPB

National SemiconductorIn Stock: 1185LP3892ES-1.2/NOPB Datasheet

Parametric EquivalentRFQ

LP3882ES-1.2/NOPB

Texas InstrumentsIn Stock: 1395LP3882ES-1.2/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP38842S-1.2 are classified based on strict electrical and mechanical parameter alignment:

Direct Manufacturer Equivalent: LP38842S-1.2/NOPB shares identical electrical specifications with the main part number, differing only in packaging format (Tube vs. unspecified) and product status (Active vs. Obsolete). This part maintains all critical parameters including 1.2V fixed output, 1.5A current capacity, 0.315V maximum dropout voltage, and TO-263 package configuration.

Parametric Equivalents: LP3892ES-1.2/NOPB and LP3882ES-1.2/NOPB are classified as parametric equivalents because they maintain the core functional specifications—1.2V fixed output, 1.5A current capacity, identical package type, and matching control and protection features—while exhibiting variations in secondary parameters such as dropout voltage and quiescent supply current.

Key parameters determining substitution eligibility:

• Output voltage: 1.2V fixed
• Output current: 1.5A
• Package type: TO-263 (DDPAK-5)
• Output configuration: Positive fixed
• Control features: Enable function
• Protection: Over Current, Over Temperature, Short Circuit

Parameter Comparison

Engineering Selection Recommendations

LP38842S-1.2/NOPB is the primary substitute for the obsolete LP38842S-1.2. This part maintains identical electrical specifications and is currently in active production status. It is ROHS3 compliant, addressing regulatory requirements that the original part does not meet. The only distinction is packaging format (Tube), which does not affect electrical performance or PCB integration.

LP3882ES-1.2/NOPB (Texas Instruments) is a secondary substitute offering equivalent core functionality with improved supply current characteristics (8 mA vs. 40 mA maximum). Dropout voltage is marginally lower at 0.32V compared to 0.315V, representing negligible practical difference. This part is ROHS3 compliant and actively produced.

LP3892ES-1.2/NOPB (National Semiconductor) is a tertiary substitute maintaining all critical output specifications. It exhibits higher dropout voltage at 0.50V, which may impact applications with tight input-to-output voltage margins. Supply current is reduced to 8 mA. This part is actively produced but RoHS compliance status is not specified in available documentation.

Selection priority is determined by product status (Active preferred over Obsolete), regulatory compliance (ROHS3 preferred), and dropout voltage performance (lower values preferred for margin-constrained designs).

Frequently Asked Questions (FAQ)

Q: Can LP38842S-1.2/NOPB be used as a direct replacement for LP38842S-1.2?

A: Yes. LP38842S-1.2/NOPB is electrically and mechanically identical to the obsolete LP38842S-1.2, with the exception of packaging format (Tube). Both deliver 1.2V at 1.5A in TO-263 packages with identical dropout voltage and protection features. The primary advantage of the /NOPB variant is active production status and ROHS3 compliance.

Q: What is the difference between the parametric equivalents LP3882ES-1.2/NOPB and LP3892ES-1.2/NOPB?

A: Both maintain 1.2V output and 1.5A capacity in identical TO-263 packages. LP3882ES-1.2/NOPB (Texas Instruments) has 0.32V dropout voltage and 8 mA supply current. LP3892ES-1.2/NOPB (National Semiconductor) has 0.50V dropout voltage and 8 mA supply current. The 0.18V dropout difference may be significant in applications with limited input voltage headroom.

Q: Are all substitute parts available in the same TO-263 package?

A: Yes. All listed substitutes use the TO-263-6 (D2PAK with 5 Leads + Tab) package, ensuring identical PCB footprint and mounting compatibility.

Q: What is the impact of different supply current ratings on system design?

A: The main part and LP38842S-1.2/NOPB specify 40 mA maximum supply current, while LP3882ES-1.2/NOPB and LP3892ES-1.2/NOPB specify 8 mA. This difference affects quiescent power consumption in standby or low-load conditions. Applications with strict power budget constraints may benefit from the lower-current variants.

Q: Does RoHS compliance affect functional compatibility?

A: No. RoHS compliance is a manufacturing and material standard that does not alter electrical performance or pin compatibility. ROHS3-compliant parts (LP38842S-1.2/NOPB, LP3882ES-1.2/NOPB) are preferred for applications subject to regulatory requirements, but all parts are functionally interchangeable within the specified electrical parameters.

Q: Which substitute should be selected for new designs?

A: LP38842S-1.2/NOPB is recommended for new designs as the direct equivalent with active production status and ROHS3 compliance. For applications prioritizing minimal quiescent current, LP3882ES-1.2/NOPB offers equivalent performance with reduced supply current. LP3892ES-1.2/NOPB is suitable only if higher dropout voltage is acceptable for the application.