DS21349Q Equivalent & Substitute Parts

Part Overview

The DS21349Q is a Telecom Interface IC functioning as a Line Interface Unit (LIU) in a 28-PLCC surface mount package. This component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing system maintenance and new design implementations. The DS21349Q operates within a 3.135V to 3.465V supply voltage range and supports T1/J1 telecom line interface applications across a 0°C to 70°C operating temperature range.

Substiute Parts

DS21349Q

Analog Devices Inc./Maxim IntegratedIn Stock: 810DS21349Q Datasheet

Current PartRFQ

DS21349Q+

Analog Devices Inc./Maxim IntegratedIn Stock: 949DS21349Q+ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS21349Q is determined by strict alignment across the following critical parameters:

• Functional equivalence: Line Interface Unit (LIU) for T1/J1 telecom applications
• Electrical compatibility: Supply voltage range 3.135V ~ 3.465V
• Package compatibility: 28-LCC (J-Lead) / 28-PLCC (11.51x11.51) surface mount configuration
• Operating temperature range: 0°C ~ 70°C
• Manufacturer consistency: Analog Devices Inc./Maxim Integrated

The DS21349Q+ meets all substitution criteria as a direct equivalent part. The primary distinction between these parts is product status and compliance certification, not functional or electrical parameters.

Parameter Comparison

Engineering Selection Recommendations

The DS21349Q+ is the direct substitute for the DS21349Q. Both parts share identical electrical specifications, package geometry, and functional characteristics. The DS21349Q+ is preferred for new designs and ongoing procurement due to its active product status and ROHS3 compliance certification. The obsolete status of the DS21349Q restricts its availability to existing inventory; the DS21349Q+ provides equivalent functionality with current manufacturing support and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can DS21349Q+ be used as a direct replacement for DS21349Q in existing designs?

A: Yes. The DS21349Q+ is electrically and mechanically equivalent to the DS21349Q. Both parts operate at identical supply voltages (3.135V ~ 3.465V), support the same temperature range (0°C ~ 70°C), and use the same 28-PLCC package configuration. No circuit modifications are required.

Q: What is the primary difference between DS21349Q and DS21349Q+?

A: The DS21349Q is obsolete with RoHS non-compliant status. The DS21349Q+ is an active product with ROHS3 compliance. Functionally and electrically, both parts are identical.

Q: Are there any packaging differences between these parts?

A: Both parts use the 28-LCC (J-Lead) package with 28-PLCC (11.51x11.51) dimensions. Packaging is identical. The DS21349Q+ is supplied in Tube packaging, while the DS21349Q packaging specification was not provided.

Q: Is the DS21349Q+ suitable for new product designs?

A: Yes. The DS21349Q+ is the recommended choice for new designs. It provides active manufacturing support, regulatory compliance, and equivalent performance to the obsolete DS21349Q.

Q: What compliance certifications apply to these parts?

A: Both parts maintain REACH Unaffected status and EAR99 export classification. The DS21349Q+ additionally carries ROHS3 compliance certification, while the DS21349Q is RoHS non-compliant.