LP38855SX-1.2 Equivalent & Substitute Parts

Part Overview

The LP38855SX-1.2 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 1.5A output current at a fixed 1.2V output with a maximum dropout voltage of 0.18V at full load. The part operates across an industrial temperature range of -40°C to 125°C and includes integrated protection features for over-current, over-temperature, short-circuit, and under-voltage lockout conditions.

The LP38855SX-1.2 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support long-term production requirements for applications currently using this regulator.

Substiute Parts

LP38855SX-1.2

Texas InstrumentsIn Stock: 2702LP38855SX-1.2 Datasheet

Current PartRFQ

LP38855SX-1.2/NOPB

National SemiconductorIn Stock: 52657LP38855SX-1.2/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP38855SX-1.2 is determined by strict equivalence across the following electrical and mechanical parameters:

• Fixed output voltage of 1.2V
• Output current capability of 1.5A minimum
• Maximum input voltage of 5.5V or greater
• Dropout voltage specification of 0.18V @ 1.5A or lower
• Quiescent current of 300 µA or lower
• PSRR performance of 80dB ~ 65dB (120Hz ~ 1kHz) or better
• TO-263 (DDPAK-5) package compatibility
• Operating temperature range of -40°C to 125°C minimum
• Integrated protection features: Over Current, Over Temperature, Short Circuit, and UVLO

Only parts meeting all these criteria are considered direct parametric equivalents.

Parameter Comparison

Engineering Selection Recommendations

The LP38855SX-1.2/NOPB is a direct parametric equivalent to the obsolete LP38855SX-1.2. Both parts share identical electrical specifications, output voltage, current rating, dropout voltage, quiescent current, PSRR performance, and protection feature sets. Both are packaged in TO-263 (DDPAK-5) and operate across the same temperature range.

The primary distinction is product status: the LP38855SX-1.2/NOPB is classified as active, ensuring ongoing availability and supply chain support. The LP38855SX-1.2/NOPB carries the same ECCN (EAR99) and HTSUS classification, maintaining regulatory consistency for export and tariff purposes.

For new designs or production continuity, the LP38855SX-1.2/NOPB is the appropriate selection due to its active status and guaranteed long-term availability.

Frequently Asked Questions (FAQ)

Q: Can the LP38855SX-1.2/NOPB be used as a direct replacement for the LP38855SX-1.2?

A: Yes. Both parts are parametrically identical across all electrical specifications, output voltage, current rating, dropout voltage, quiescent current, PSRR, protection features, and package type. Pin-for-pin compatibility is maintained in the TO-263 (DDPAK-5) package.

Q: What is the significance of the "/NOPB" suffix in the part number?

A: The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging. This designation reflects the manufacturing process and material composition but does not alter the electrical performance or functional characteristics of the device.

Q: Are there any compliance differences between the two parts?

A: Both parts share the same ECCN (EAR99) and HTSUS code (8542.39.0001). The LP38855SX-1.2 is marked as RoHS non-compliant and REACH Unaffected. Compliance status for the LP38855SX-1.2/NOPB is not specified in the provided data.

Q: Why is the LP38855SX-1.2 classified as obsolete?

A: The LP38855SX-1.2 has reached end-of-life status. The LP38855SX-1.2/NOPB remains in active production and is the recommended substitute for ongoing applications.

Q: Are the package dimensions identical between both parts?

A: Both parts use the TO-263 (DDPAK-5) package type. Package dimensions and lead configurations are identical, ensuring mechanical compatibility on existing PCB layouts.

Q: What protection features are included in both regulators?

A: Both the LP38855SX-1.2 and LP38855SX-1.2/NOPB include integrated protection for over-current, over-temperature, short-circuit conditions, and under-voltage lockout (UVLO).