T491C685K025AS-F Molded Tantalum Capacitor

Part Overview

The T491C685K025AS-F is a 6.8 µF molded tantalum capacitor rated for 25 V, manufactured by Cornell Dubilier Electronics (CDE) in the 2312 (6032 Metric) package. This component is classified as obsolete, making it necessary to identify active alternative models that maintain electrical and mechanical compatibility for ongoing production or replacement applications. The part operates across an extended temperature range of -55°C to 125°C and meets ROHS3 compliance requirements.

Substiute Parts

T491C685K025AS-F

Cornell Dubilier Electronics (CDE)In Stock: 934T491C685K025AS-F Datasheet

Current PartRFQ

T491C685K025AT

KEMETIn Stock: 2830T491C685K025AT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the T491C685K025AS-F must satisfy the following electrical and mechanical parameters to ensure direct compatibility:

Electrical Compatibility Requirements:

• Capacitance: 6.8 µF (fixed value, no tolerance variation acceptable)
• Tolerance: ±10% (standard tolerance class for this capacitor series)
• Voltage Rating: 25 V (minimum rated voltage; higher ratings acceptable)
• Type: Molded Tantalum (required technology)
• Operating Temperature Range: -55°C to 125°C (minimum coverage required)

Mechanical Compatibility Requirements:

• Package / Case: 2312 (6032 Metric) (mandatory for PCB footprint compatibility)
• Mounting Type: Surface Mount (required for automated assembly)
• Physical Dimensions: Maximum 0.236" L x 0.126" W x 0.110" H (footprint constraint)
• Moisture Sensitivity Level: MSL 1 (Unlimited) (handling and storage compatibility)

Regulatory and Compliance Requirements:

• RoHS3 Compliance (mandatory for environmental standards)

The T491C685K025AT from KEMET meets all specified electrical, mechanical, and regulatory requirements, providing a direct substitute with active product status.

Parameter Comparison

Engineering Selection Recommendations

The T491C685K025AT (KEMET) is a qualified substitute for the obsolete T491C685K025AS-F (CDE). Selection of the KEMET part is justified by the following engineering factors:

Product Status: The original CDE part is obsolete, necessitating transition to an active alternative. The KEMET T491C685K025AT maintains active product status, ensuring continued availability and supply chain reliability.

Regulatory Compliance: Both parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, satisfying environmental standards and simplifying handling and storage requirements without additional constraints.

Electrical Equivalence: The substitute maintains identical electrical parameters: 6.8 µF capacitance, ±10% tolerance, and 25 V rating. The substitute provides specified ESR (1.9 Ohm) and lifetime data (2000 Hrs @ 125°C), offering measurable performance documentation.

Mechanical Fit: The substitute shares identical package dimensions and mounting specifications, enabling direct PCB-level replacement without redesign or layout modification.

Series Continuity: Both parts belong to the T491 series, indicating engineering compatibility within the same product family.

Frequently Asked Questions (FAQ)

Q: Can the T491C685K025AT directly replace the T491C685K025AS-F without PCB modification?

A: Yes. Both parts share identical 2312 (6032 Metric) package dimensions and surface mount footprint specifications, enabling direct substitution on existing PCB layouts without mechanical or electrical redesign.

Q: Are the electrical characteristics identical between these two parts?

A: Both parts provide 6.8 µF capacitance at ±10% tolerance with 25 V voltage rating and -55°C to 125°C operating temperature range. The KEMET substitute specifies ESR (1.9 Ohm) and lifetime data, providing additional performance documentation compared to the original part.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: capacitance value (6.8 µF), voltage rating (25 V), tolerance (±10%), package type (2312 / 6032 Metric), mounting method (surface mount), operating temperature range (-55°C to 125°C), and regulatory compliance (ROHS3). Deviations from any of these parameters disqualify a part as a direct substitute.

Q: Is RoHS3 compliance maintained with the substitute part?

A: Yes. The T491C685K025AT maintains ROHS3 compliance, matching the original part's environmental and regulatory status.

Q: What is the moisture sensitivity level (MSL) for the substitute part?

A: Both the original and substitute parts carry MSL 1 (Unlimited) rating, indicating no special moisture control requirements during storage, handling, or assembly.

Q: Does the substitute part provide performance documentation not available for the original?

A: The KEMET substitute provides specified ESR (1.9 Ohm) and lifetime rating (2000 Hrs @ 125°C), offering measurable performance data. The original CDE part does not document these parameters in the provided specifications.

Q: Are there alternative manufacturers offering this exact capacitance and voltage combination?

A: Based on the provided parameters, the T491C685K025AT from KEMET is the qualified substitute. Additional alternatives may exist within the broader market, but the KEMET part satisfies all specified electrical, mechanical, and regulatory requirements for direct substitution.