BQ24055DSST Equivalent & Substitute Parts

Part Overview

The BQ24055DSST is a single-cell lithium-ion/polymer battery charger IC manufactured by Texas Instruments, housed in a 12-WSON (2x3) package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part delivers constant-current, programmable charging at up to 800mA with integrated fault protection for over-temperature, over-voltage, and short-circuit conditions. USB interface connectivity and a maximum supply voltage rating of 28V support diverse application requirements.

Substiute Parts

BQ24055DSST

Texas InstrumentsIn Stock: 4958BQ24055DSST Datasheet

Current PartRFQ

BQ24050DSQT

Texas InstrumentsIn Stock: 7388BQ24050DSQT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BQ24055DSST is determined by strict alignment of the following electrical and mechanical parameters:

• Battery Chemistry & Cell Count: Both main and substitute parts must support single-cell lithium-ion/polymer charging
• Charging Current Capability: Maximum charge current must equal or exceed 800mA
• Battery Pack Voltage: Output voltage must match 4.2V specification
• Supply Voltage Range: Maximum supply voltage must support 28V operation
• Interface Type: USB interface requirement must be maintained
• Operating Temperature Range: Must support 0°C ~ 125°C (TJ) specification
• Fault Protection: Over-temperature, over-voltage, and short-circuit protection must be present
• Compliance & Certifications: RoHS3 compliance and MSL rating must be equivalent or superior

The BQ24050DSQT qualifies as a manufacturer-recommended substitute based on these criteria. While the package footprint differs (10-WSON vs. 12-WSON), all electrical parameters and functional specifications remain compatible with the original design requirements.

Parameter Comparison

Engineering Selection Recommendations

The BQ24050DSQT is the manufacturer-recommended substitute for the obsolete BQ24055DSST. Both components maintain identical electrical specifications, functional capabilities, and compliance certifications. The primary design consideration is the package footprint transition from 12-WSON (2x3) to 10-WSON (2x2), which requires PCB layout modification but does not affect electrical performance or thermal characteristics.

The BQ24050DSQT carries Active product status, ensuring long-term availability and manufacturing support. Both parts maintain ROHS3 compliance and equivalent MSL ratings, supporting consistent supply chain management and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can the BQ24050DSQT directly replace the BQ24055DSST without circuit modifications?

A: Electrical functionality is fully compatible. PCB layout modification is required due to package footprint differences (12-WSON vs. 10-WSON). Pin configuration and electrical interface remain functionally equivalent.

Q: What is the primary reason for substitution?

A: The BQ24055DSST is classified as obsolete. The BQ24050DSQT is the manufacturer-recommended active alternative with identical electrical specifications.

Q: Are there compliance or certification differences between these parts?

A: Both parts maintain ROHS3 compliance, identical MSL ratings (2, 1 Year), and equivalent regulatory certifications (EAR99, HTSUS 8542.39.0001).

Q: Does the package change affect thermal performance?

A: Both packages feature exposed pads and are designed for surface-mount applications. Thermal characteristics remain equivalent for the specified operating temperature range (0°C ~ 125°C TJ).

Q: What charging specifications remain constant between these parts?

A: Maximum charge current (800mA), battery pack voltage (4.2V), maximum supply voltage (28V), USB interface, and fault protection features (over-temperature, over-voltage, short-circuit) are identical.