Equivalent & Substitute Parts for T491D686K006AS

Part Overview

The T491D686K006AS is a 68 µF molded tantalum capacitor manufactured by KEMET, rated at 6.3 V with ±10% tolerance in a 2917 (7343 Metric) surface mount package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement. The part operates across a temperature range of -55°C to 125°C and features 800 mOhm equivalent series resistance (ESR). Locating functionally compatible alternatives ensures design continuity and supply chain reliability.

Substiute Parts

T491D686K006AS

KEMETIn Stock: 972T491D686K006AS Datasheet

Current PartRFQ

T491D686K006AT

KEMETIn Stock: 7545T491D686K006AT Datasheet

DirectRFQ

293D686X96R3D2TE3

Vishay SpragueIn Stock: 2118293D686X96R3D2TE3 Datasheet

SimilarRFQ

TAJD686K006H

KYOCERA AVXIn Stock: 1050TAJD686K006H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the T491D686K006AS is determined by strict alignment with the following electrical and mechanical parameters:

Critical Matching Parameters:

• Capacitance: 68 µF (exact match required)
• Voltage Rating: 6.3 V (exact match required)
• Tolerance: ±10% (exact match required)
• Package / Case: 2917 (7343 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Type: Molded Tantalum (exact match required)

Secondary Parameters:

• ESR: 800 mOhm (reference value; lower ESR values are functionally acceptable)
• Physical Dimensions: 0.287" L x 0.169" W, 0.122" H max (must match for PCB fit)

All identified substitute parts meet these criteria. Differences in product status (active vs. obsolete), packaging format (Tape & Reel vs. bulk), and manufacturer-specific certifications do not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: T491D686K006AT (KEMET)

The T491D686K006AT is the direct successor to the T491D686K006AS within the KEMET T491 series. Both parts share identical electrical specifications and physical dimensions. The T491D686K006AT is currently in active production status and carries ROHS3 compliance certification. This part is available in Tape & Reel packaging format, which is standard for automated assembly operations. Selection of this part eliminates any cross-manufacturer compatibility concerns and maintains design continuity with the original component family.

Secondary Recommendation: 293D686X96R3D2TE3 (Vishay Sprague)

The 293D686X96R3D2TE3 from Vishay Sprague's TANTAMOUNT™ 293D series meets all critical electrical and mechanical parameters. This part features 700 mOhm ESR, which is lower than the original specification and provides improved performance characteristics. The part is active in production and ROHS3 compliant. Cross-manufacturer substitution is electrically valid; however, design verification for any application-specific requirements is necessary due to manufacturer-specific material compositions and reliability data.

Tertiary Recommendation: TAJD686K006H (KYOCERA AVX)

The TAJD686K006H from KYOCERA AVX's TAJ series satisfies all critical electrical and mechanical parameters. This part is currently active in production. ESR specification is not provided in available documentation. The part carries non-RoHS compliance status, matching the original component. This option is suitable for applications where RoHS compliance is not a design requirement.

Compliance Considerations:

For applications requiring RoHS3 compliance, T491D686K006AT or 293D686X96R3D2TE3 are appropriate selections. For applications with no RoHS requirement, all three substitute parts are functionally equivalent.

Frequently Asked Questions (FAQ)

Q: Can T491D686K006AT be used as a direct replacement for T491D686K006AS?

A: Yes. Both parts are identical in electrical specifications (68 µF, 6.3 V, ±10% tolerance), physical dimensions (2917 package, 0.287" × 0.169" × 0.122" max), and operating temperature range (-55°C to 125°C). The primary difference is product status: T491D686K006AS is obsolete, while T491D686K006AT is active production. The T491D686K006AT is the recommended direct replacement.

Q: What is the difference between T491D686K006AS and T491D686K006AT?

A: The parts are electrically and mechanically identical. The suffix difference (AS vs. AT) indicates packaging format: AS is bulk packaging, while AT is Tape & Reel format. T491D686K006AT also carries ROHS3 compliance certification, whereas T491D686K006AS does not.

Q: Can I substitute a Vishay Sprague 293D686X96R3D2TE3 for the KEMET T491D686K006AS?

A: Yes, from an electrical and mechanical standpoint. Both parts have 68 µF capacitance, 6.3 V rating, ±10% tolerance, and 2917 package dimensions. The Vishay part features 700 mOhm ESR compared to 800 mOhm in the original, which is a performance improvement. Cross-manufacturer substitution is valid; however, design teams should confirm compatibility with any application-specific requirements related to manufacturer-specific reliability data or material properties.

Q: Does ESR difference affect substitution compatibility?

A: ESR is a secondary parameter for substitution purposes. The 293D686X96R3D2TE3 has 700 mOhm ESR versus 800 mOhm in the original specification. Lower ESR generally provides improved performance in high-frequency or high-current applications. Substitution is electrically valid; however, applications sensitive to ESR characteristics should be evaluated individually.

Q: Are all substitute parts available in the same package format?

A: No. T491D686K006AT and 293D686X96R3D2TE3 are available in Tape & Reel format, suitable for automated assembly. TAJD686K006H packaging format is not specified in available data. Confirm packaging availability with your supplier based on assembly requirements.

Q: What is the RoHS compliance status of each substitute?

A: T491D686K006AT and 293D686X96R3D2TE3 are ROHS3 compliant. TAJD686K006H is non-compliant, matching the original T491D686K006AS. Select based on your application's regulatory requirements.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. All substitute parts share identical physical dimensions (0.287" L × 0.169" W, 0.122" H max) and 2917 package specifications. PCB footprints designed for T491D686K006AS will accommodate all listed substitutes without modification.