UC1854BJ Equivalent & Substitute Parts

Part Overview

The UC1854BJ is a Power Factor Correction (PFC) controller IC manufactured by Texas Instruments, designed for enhanced high power factor pre-regulation applications. Operating in average current mode, this device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The UC1854BJ is packaged in a 16-CDIP through-hole configuration and operates across a supply voltage range of 10V to 20V with a startup current of 250 µA.

Finding equivalent or substitute parts for the UC1854BJ is necessary due to its Last Time Buy status and the finite inventory of 1408 pieces. Organizations requiring this functionality for new designs or ongoing production must evaluate available alternatives to ensure long-term supply chain continuity.

Substiute Parts

UC1854BJ

Texas InstrumentsIn Stock: 1474UC1854BJ Datasheet

Current PartRFQ

UCC28180DR

Texas InstrumentsIn Stock: 25251UCC28180DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UC1854BJ with the UCC28180DR is based on the following criteria:

Functional Compatibility: Both devices are PFC controller ICs manufactured by Texas Instruments within the Power Management (PMIC) category, designed to regulate power factor in AC-DC conversion applications.

Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH Unaffected status, ensuring compatibility with environmental and regulatory requirements.

Supply Chain Status: The UCC28180DR is classified as Active product status with significantly higher inventory availability (25200 pieces), providing reliable long-term sourcing compared to the Last Time Buy UC1854BJ.

Key Operational Differences: The UCC28180DR operates in Continuous Conduction (CCM) mode with a switching frequency range of 18kHz to 250kHz, compared to the UC1854BJ's average current mode operation. The UCC28180DR features a lower startup current of 75 µA versus 250 µA and operates at a higher supply voltage of 21V.

Package Consideration: The UCC28180DR uses an 8-SOIC surface mount package, requiring circuit board redesign compared to the through-hole 16-CDIP package of the UC1854BJ.

Parameter Comparison

Engineering Selection Recommendations

For Last Time Buy Mitigation: The UCC28180DR is the designated manufacturer-recommended substitute for the UC1854BJ. Its Active product status ensures continued availability and support from Texas Instruments, eliminating supply chain risk associated with the UC1854BJ's Last Time Buy classification.

For Regulatory Compliance: Both parts maintain equivalent ROHS3 and REACH compliance certifications, satisfying environmental and regulatory requirements without additional qualification.

For New Designs: The UCC28180DR is the appropriate selection for new product development. Its Continuous Conduction (CCM) mode operation, lower startup current, and active product status provide superior long-term reliability and manufacturability.

For Legacy System Support: Existing designs using the UC1854BJ through-hole package may require circuit board redesign to accommodate the UCC28180DR's 8-SOIC surface mount package. This transition should be evaluated against the cost of maintaining Last Time Buy inventory.

Frequently Asked Questions (FAQ)

Q: Can the UCC28180DR directly replace the UC1854BJ without circuit modifications?

A: Direct pin-for-pin replacement is not possible. The UC1854BJ uses a 16-CDIP through-hole package, while the UCC28180DR uses an 8-SOIC surface mount package. Circuit board redesign is required for substitution.

Q: What are the functional differences between average current mode and continuous conduction mode?

A: The UC1854BJ operates in average current mode, while the UCC28180DR operates in Continuous Conduction (CCM) mode. Both are valid PFC control topologies; however, they require different circuit implementations and control characteristics. Design validation is necessary when transitioning between these modes.

Q: Are there temperature range limitations when substituting the UCC28180DR?

A: The UCC28180DR operates from -40°C to 125°C, compared to the UC1854BJ's -55°C to 125°C range. Applications requiring operation below -40°C ambient temperature cannot use the UCC28180DR as a substitute.

Q: What is the impact of the different supply voltage specifications?

A: The UC1854BJ operates at 10V to 20V supply voltage, while the UCC28180DR operates at 21V. The UCC28180DR requires a higher supply voltage and may not be suitable for applications with supply voltages below 21V.

Q: How does the lower startup current of the UCC28180DR affect circuit design?

A: The UCC28180DR's startup current of 75 µA is lower than the UC1854BJ's 250 µA. This reduces inrush current and power dissipation during device initialization, potentially improving overall system efficiency and reducing thermal stress on auxiliary power supplies.

Q: What is the significance of the Moisture Sensitivity Level (MSL) difference?

A: The UC1854BJ has MSL Not Applicable, while the UCC28180DR has MSL 1 (Unlimited). MSL 1 indicates the component has unlimited shelf life without moisture baking requirements, simplifying inventory management and reducing handling constraints.