Equivalent & Substitute Parts for T491B685K010AS

Part Overview

The T491B685K010AS is a 6.8 µF molded tantalum capacitor rated at 10 V with a 1411 (3528 Metric) package footprint. Manufactured by KEMET in the T491 series, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Substiute Parts

T491B685K010AS

KEMETIn Stock: 825T491B685K010AS Datasheet

Current PartRFQ

T491B685K010AT

KEMETIn Stock: 53389T491B685K010AT Datasheet

DirectRFQ

293D685X9010B2TE3

Vishay SpragueIn Stock: 3821293D685X9010B2TE3 Datasheet

SimilarRFQ

TAJB685K010H

KYOCERA AVXIn Stock: 1085TAJB685K010H Datasheet

SimilarRFQ

TAJB685K010HNJ

KYOCERA AVXIn Stock: 1018TAJB685K010HNJ Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the T491B685K010AS is determined by strict equivalence across the following parameters:

• Capacitance: 6.8 µF (exact match required)
• Voltage Rating: 10 V (exact match required)
• Tolerance: ±10% (exact match required)
• Package / Case: 1411 (3528 Metric) (exact match required)
• Physical Dimensions: 0.138" L x 0.110" W, Height 0.083" max (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 parts must maintain identical electrical specifications and physical footprints to ensure direct replacement without circuit redesign or PCB layout modification. ESR (Equivalent Series Resistance) values may vary within acceptable design margins. Packaging format (bulk versus tape & reel) does not affect electrical substitutability but impacts procurement and assembly processes.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: T491B685K010AT

The T491B685K010AT is the direct equivalent from KEMET's active product line. This part maintains identical electrical and physical specifications to the T491B685K010AS, including capacitance, voltage rating, tolerance, package dimensions, and operating temperature range. The T491B685K010AT carries Active product status and ROHS3 compliance, providing long-term availability and regulatory alignment. The specified lifetime of 2000 hours at 125°C provides documented reliability data. This part is available in Tape & Reel packaging, suitable for automated assembly processes.

Secondary Substitute: 293D685X9010B2TE3

The 293D685X9010B2TE3 from Vishay Sprague (TANTAMOUNT™ series, 293D) meets all critical electrical and physical parameters. This part features a lower ESR value of 2.9 Ohm compared to 3.5 Ohm in the main part, which may provide performance benefits in applications sensitive to impedance characteristics. The part carries ROHS3 compliance and Active product status. Physical dimensions are equivalent with a maximum seated height of 2.11mm, within acceptable tolerance of the 2.10mm specification.

Tertiary Substitutes: TAJB685K010H and TAJB685K010HNJ

Both KYOCERA AVX TAJ series parts (TAJB685K010H and TAJB685K010HNJ) provide electrical and physical equivalence across all critical parameters. These parts maintain the 1411 (3528 Metric) package footprint and identical dimensional specifications. TAJB685K010HNJ is available in Tape & Reel packaging for automated assembly. Both parts carry Active product status. Note that TAJB685K010HNJ is subject to REACH regulations, while TAJB685K010H is REACH Unaffected. Both parts are RoHS non-compliant, matching the compliance status of the original T491B685K010AS.

Compliance Considerations

For applications requiring RoHS3 compliance, T491B685K010AT or 293D685X9010B2TE3 are the appropriate selections. For applications with no RoHS compliance requirement, all substitute parts are electrically and mechanically compatible.

Frequently Asked Questions (FAQ)

Q: Can T491B685K010AT be used as a direct replacement for T491B685K010AS?

A: Yes. The T491B685K010AT is a direct substitute. Both parts share identical capacitance (6.8 µF), voltage rating (10 V), tolerance (±10%), package type (1411/3528 Metric), physical dimensions, and operating temperature range (-55°C ~ 125°C). The primary difference is product status: T491B685K010AT is Active while T491B685K010AS is Obsolete. No circuit redesign or PCB layout modification is required.

Q: What is the difference between bulk and Tape & Reel packaging?

A: Bulk packaging contains loose components suitable for manual assembly or small-volume applications. Tape & Reel packaging presents components on a continuous tape for automated pick-and-place assembly equipment. Electrical and mechanical specifications are identical; packaging format affects procurement, storage, and assembly methodology only.

Q: Does the lower ESR of 293D685X9010B2TE3 (2.9 Ohm vs. 3.5 Ohm) affect compatibility?

A: Lower ESR is generally beneficial in applications where impedance characteristics impact performance. The 293D685X9010B2TE3 with 2.9 Ohm ESR is electrically compatible with designs specified for 3.5 Ohm ESR. Applications with strict ESR requirements should confirm that lower impedance does not introduce unintended circuit behavior.

Q: Are TAJB685K010H and TAJB685K010HNJ interchangeable?

A: Yes, these parts are electrically and mechanically interchangeable. The primary difference is packaging: TAJB685K010H is supplied in bulk format, while TAJB685K010HNJ is supplied in Tape & Reel format. TAJB685K010HNJ is subject to REACH regulations, while TAJB685K010H is REACH Unaffected. Select based on assembly process requirements and regulatory obligations.

Q: Which substitute part should be selected for new designs requiring RoHS3 compliance?

A: T491B685K010AT or 293D685X9010B2TE3 are the appropriate selections for RoHS3-compliant designs. Both parts carry ROHS3 Compliant status. TAJB685K010H and TAJB685K010HNJ are RoHS non-compliant and are not suitable for applications with RoHS3 requirements.

Q: Is the 2.11mm seated height of 293D685X9010B2TE3 compatible with PCB designs specified for 2.10mm maximum height?

A: The 293D685X9010B2TE3 has a maximum seated height of 2.11mm, which exceeds the 2.10mm specification of the original part by 0.01mm. This marginal difference is within typical PCB clearance tolerances for most applications. Verify clearance in designs with tight vertical constraints or high-density component placement.

Q: What is the significance of REACH Affected versus REACH Unaffected status?

A: REACH Affected status indicates the component is subject to European REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) regulations. REACH Unaffected indicates the component is not subject to these regulations. For applications requiring REACH compliance or operating in regulated markets, select parts with appropriate REACH status. TAJB685K010HNJ is REACH Affected; all other substitutes are REACH Unaffected.