AAT3681AIJS-4.2-1-T1 Equivalent & Substitute Parts

Part Overview

The AAT3681AIJS-4.2-1-T1 is a single-cell lithium ion/polymer battery charger IC manufactured by Skyworks Solutions Inc., housed in an 8-SC70JW surface mount package. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and production continuity. The charger provides constant-programmable charging current up to 500mA with integrated fault protection for over-temperature, over-voltage, and short-circuit conditions, operating across a -40°C to 85°C temperature range with USB interface connectivity.

Substiute Parts

AAT3681AIJS-4.2-1-T1

Skyworks Solutions Inc.In Stock: 1056AAT3681AIJS-4.2-1-T1 Datasheet

Current PartRFQ

BQ24050DSQR

Texas InstrumentsIn Stock: 3519BQ24050DSQR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AAT3681AIJS-4.2-1-T1 is determined by the following critical parameters:

• Single-cell lithium ion/polymer battery chemistry compatibility
• Constant-programmable charging current capability
• 4.2V battery pack voltage output
• USB interface requirement
• Integrated over-temperature, over-voltage, and short-circuit protection
• Surface mount technology
• Active product status for ongoing availability

The BQ24050DSQR from Texas Instruments qualifies as a functional equivalent based on these core criteria. Both devices target single-cell lithium ion/polymer charging applications with programmable current control, identical battery voltage output, USB interface, and comprehensive fault protection architecture.

Parameter Comparison

Engineering Selection Recommendations

The BQ24050DSQR is the designated substitute for the obsolete AAT3681AIJS-4.2-1-T1. Both components maintain ROHS3 compliance and EAR99 export classification, ensuring regulatory continuity. The BQ24050DSQR offers active product status with higher maximum supply voltage (28V vs. 7.5V) and increased maximum charging current (800mA vs. 500mA), providing enhanced design flexibility for applications requiring higher input voltage tolerance or faster charging rates. The extended operating temperature range (0°C ~ 125°C) of the BQ24050DSQR accommodates broader thermal environments compared to the original part's -40°C ~ 85°C specification. Package geometry differs between the two devices, requiring PCB layout modification during migration.

Frequently Asked Questions (FAQ)

Q: Can the BQ24050DSQR directly replace the AAT3681AIJS-4.2-1-T1 without design changes?

A: Functional substitution is possible, but PCB layout modification is required due to different package geometries. The AAT3681AIJS-4.2-1-T1 uses an 8-TFSOJ package while the BQ24050DSQR uses a 10-WFDFN Exposed Pad package. Pin configuration and footprint differences necessitate schematic and layout review.

Q: What are the key compatibility criteria for this substitution?

A: Both devices support single-cell lithium ion/polymer charging with 4.2V output, programmable constant charging current, USB interface, and integrated fault protection. These core functional parameters establish substitution eligibility.

Q: Does the higher maximum supply voltage of the BQ24050DSQR affect compatibility?

A: The BQ24050DSQR's 28V maximum supply voltage is a superset capability relative to the original part's 7.5V specification. Applications designed for the AAT3681AIJS-4.2-1-T1 operating within 7.5V input limits remain fully compatible with the BQ24050DSQR.

Q: Are there temperature range considerations for this substitution?

A: The BQ24050DSQR operates from 0°C ~ 125°C (TJ), while the original part operates from -40°C ~ 85°C (TA). Applications requiring operation below 0°C or above 125°C must evaluate alternative solutions.

Q: What is the impact of the different MSL ratings?

A: The AAT3681AIJS-4.2-1-T1 carries MSL 1 (Unlimited) while the BQ24050DSQR carries MSL 2 (1 Year). The BQ24050DSQR requires moisture control during storage and handling according to MSL 2 specifications.