T491C686K006AS Equivalent & Substitute Parts

Part Overview

The T491C686K006AS is a 68 µF molded tantalum capacitor manufactured by KEMET, rated for 6.3 V operation in a 2312 (6032 Metric) surface mount package. This component is classified as obsolete, indicating that direct procurement from the original manufacturer may be limited or unavailable. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or repair requirements for applications utilizing this capacitor specification.

Substiute Parts

T491C686K006AS

KEMETIn Stock: 886T491C686K006AS Datasheet

Current PartRFQ

T491C686K006AT

KEMETIn Stock: 2195T491C686K006AT Datasheet

DirectRFQ

293D686X96R3C2TE3

Vishay SpragueIn Stock: 2106293D686X96R3C2TE3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the T491C686K006AS are identified based on strict electrical and mechanical parameter matching within the allowed specifications for molded tantalum capacitors in this category.

Substitution Criteria:

• Capacitance: 68 µF (exact match required)
• Voltage Rating: 6.3 V (exact match required)
• Tolerance: ±10% (exact match required)
• Package / Case: 2312 (6032 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Type: Molded Tantalum (exact match required)

Substitute Classification:

Direct Manufacturer Substitute: T491C686K006AT (KEMET) - Identical electrical and mechanical specifications with active product status and improved compliance documentation.

Similar Manufacturer Substitute: 293D686X96R3C2TE3 (Vishay Sprague) - Meets all critical electrical and mechanical parameters. ESR specification differs (800 mOhm vs. 1.2 Ohm), representing a performance improvement in ripple current handling.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred):

The T491C686K006AT is the primary substitute for the obsolete T491C686K006AS. Both parts are manufactured by KEMET and share identical electrical specifications (68 µF, 6.3 V, ±10%, 1.2 Ohm ESR) and mechanical dimensions (2312 package, surface mount). The T491C686K006AT carries active product status and ROHS3 compliance, providing improved supply chain availability and regulatory alignment compared to the obsolete main part. This substitute requires no circuit redesign or validation.

For Alternative Sourcing:

The 293D686X96R3C2TE3 (Vishay Sprague TANTAMOUNT™ series) meets all critical electrical and mechanical parameters. This part features a lower ESR specification (800 mOhm versus 1.2 Ohm), which represents improved performance in ripple current handling and reduced heat generation. The identical package dimensions and surface mount configuration ensure PCB compatibility. This substitute is suitable for applications where the lower ESR provides operational benefits. Both substitute parts carry ROHS3 compliance and active product status.

Compliance Considerations:

The main part T491C686K006AS is RoHS non-compliant. Both substitute parts (T491C686K006AT and 293D686X96R3C2TE3) are ROHS3 compliant, supporting modern manufacturing and regulatory requirements. Selection should account for end-product compliance obligations.

Frequently Asked Questions (FAQ)

Q: Can T491C686K006AT be used as a direct replacement for T491C686K006AS?

A: Yes. Both parts are identical in capacitance (68 µF), voltage rating (6.3 V), tolerance (±10%), ESR (1.2 Ohm), package (2312), and operating temperature range (-55°C ~ 125°C). The T491C686K006AT is the active equivalent with improved compliance status.

Q: What is the difference between T491C686K006AT and 293D686X96R3C2TE3?

A: Both parts match in capacitance, voltage, tolerance, package, and temperature range. The primary difference is ESR: T491C686K006AT has 1.2 Ohm ESR, while 293D686X96R3C2TE3 has 800 mOhm ESR. The lower ESR of the Vishay part improves ripple current performance and reduces heat dissipation.

Q: Are the physical dimensions identical across all three parts?

A: Yes. All three parts use the 2312 (6032 Metric) package with dimensions of 0.236" L x 0.126" W (6.00mm x 3.20mm). Maximum seated heights are 0.110" (2.80mm) for KEMET parts and 0.110" (2.79mm) for the Vishay part, representing negligible difference for PCB assembly compatibility.

Q: Does the lower ESR of the Vishay part affect circuit compatibility?

A: No. Lower ESR is a performance improvement that reduces impedance and heat generation. The part remains electrically compatible with circuits designed for the original 1.2 Ohm ESR specification.

Q: Are both substitute parts available in the same packaging formats?

A: Both T491C686K006AT and 293D686X96R3C2TE3 are available in Tape & Reel (TR) packaging, suitable for automated assembly processes.

Q: What is the compliance status of each part?

A: T491C686K006AS (main part) is RoHS non-compliant. T491C686K006AT and 293D686X96R3C2TE3 are both ROHS3 compliant. All three parts are REACH Unaffected and carry EAR99 ECCN classification.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. All three parts share identical electrical specifications and package dimensions, enabling direct substitution without circuit redesign or PCB layout modification.