T491C105K050AS Equivalent & Substitute Parts

Part Overview

The T491C105K050AS is a 1 µF molded tantalum capacitor rated at 50 V, manufactured by KEMET in the 2312 (6032 Metric) package. This component is classified as obsolete, indicating discontinuation from the manufacturer. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for applications utilizing this capacitor specification.

Substiute Parts

T491C105K050AS

KEMETIn Stock: 1615T491C105K050AS Datasheet

Current PartRFQ

T491C105K050AT

KEMETIn Stock: 1752T491C105K050AT Datasheet

DirectRFQ

T491C105K050AH

KEMETIn Stock: 1124T491C105K050AH Datasheet

SimilarRFQ

TAJC105K050H

KYOCERA AVXIn Stock: 853TAJC105K050H Datasheet

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TAJC105K050HNJ

KYOCERA AVXIn Stock: 867TAJC105K050HNJ Datasheet

DirectRFQ

293D105X9050C2TE3

Vishay SpragueIn Stock: 2452293D105X9050C2TE3 Datasheet

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TPSC105K050H2500

KYOCERA AVXIn Stock: 974TPSC105K050H2500 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the T491C105K050AS are qualified based on strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

• Capacitance: 1 µF (exact match required)
• Tolerance: ±10% (exact match required)
• Voltage Rating: 50 V (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)

Secondary Consideration:

• ESR (Equivalent Series Resistance): Varies across substitutes (4.6Ohm to 5.5Ohm). Lower ESR values indicate improved performance characteristics but do not disqualify substitution when primary criteria are met.

All substitute parts listed meet the mandatory primary criteria. Differences in ESR and product status (Active vs. Obsolete) are noted for engineering evaluation but do not prevent functional substitution.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: T491C105K050AT (KEMET)

T491C105K050AT is the direct successor to T491C105K050AS within the KEMET T491 series. This part maintains identical electrical specifications and package geometry while offering Active product status and ROHS3 compliance. Packaging is available in Cut Tape (CT) and Digi-Reel® formats, supporting both manual and automated assembly workflows. Inventory availability is 1700 units.

Secondary Recommendation: 293D105X9050C2TE3 (Vishay Sprague)

This Vishay Sprague TANTAMOUNT™ series part meets all primary substitution criteria and provides improved ESR performance at 4.6Ohm compared to the original 5.5Ohm specification. The part carries ROHS3 compliance and demonstrates the highest inventory availability at 2400 units. Tape & Reel packaging supports automated assembly processes.

Alternative Options: KYOCERA AVX TAJ and TPS Series

TAJC105K050HNJ and TAJC105K050H (TAJ series) provide Active status equivalents from KYOCERA AVX with identical electrical parameters. TPSC105K050H2500 (TPS series) offers superior ESR performance at 2.5Ohm, beneficial for applications requiring lower impedance characteristics. All KYOCERA AVX options carry MSL 1 rating and support Tape & Reel packaging.

Compliance Considerations:

For applications requiring RoHS3 compliance, select T491C105K050AT or 293D105X9050C2TE3. For legacy systems or applications without RoHS requirements, KEMET T491C105K050AH and KYOCERA AVX TAJ/TPS series remain functionally equivalent.

Frequently Asked Questions (FAQ)

Q: Can T491C105K050AT directly replace T491C105K050AS in existing designs?

A: Yes. T491C105K050AT is the active production equivalent within the same KEMET T491 series. Electrical specifications (1 µF, ±10%, 50 V, 5.5Ohm ESR), package dimensions (2312/6032 Metric), and operating temperature range (-55°C to 125°C) are identical. The primary difference is product status (Active vs. Obsolete) and RoHS3 compliance.

Q: What is the significance of ESR differences among substitute parts?

A: ESR (Equivalent Series Resistance) affects impedance characteristics at high frequencies. The original T491C105K050AS specifies 5.5Ohm ESR. Substitute parts range from 5.5Ohm (KEMET T491 and KYOCERA AVX TAJ series) to 4.6Ohm (Vishay 293D) to 2.5Ohm (KYOCERA AVX TPS). Lower ESR values improve performance in noise-sensitive or high-frequency applications but do not prevent substitution when primary electrical parameters match.

Q: Are packaging format differences (Cut Tape vs. Tape & Reel) significant for substitution?

A: Packaging format affects supply chain and assembly processes but not electrical or mechanical compatibility. Cut Tape (CT) and Digi-Reel® formats support manual assembly and small-volume production. Tape & Reel (TR) packaging supports automated pick-and-place assembly. Select packaging based on production requirements, not component functionality.

Q: Which substitute part offers the best compliance profile?

A: T491C105K050AT (KEMET) and 293D105X9050C2TE3 (Vishay Sprague) both carry ROHS3 compliance. T491C105K050AT maintains KEMET series continuity, while 293D105X9050C2TE3 provides cross-manufacturer qualification with improved ESR performance and higher inventory availability (2400 units).

Q: Can KYOCERA AVX parts substitute for KEMET originals?

A: Yes. TAJC105K050HNJ and TAJC105K050H meet all primary substitution criteria. Both are Active status parts with identical capacitance, tolerance, voltage rating, package dimensions, and operating temperature range. ESR specifications match the original at 5.5Ohm. Cross-manufacturer substitution is electrically and mechanically valid.

Q: What is the impact of RoHS compliance status on substitution decisions?

A: RoHS compliance is a regulatory and supply chain consideration, not an electrical performance factor. T491C105K050AS is RoHS non-compliant (Obsolete). For new designs or regulated applications, specify T491C105K050AT or 293D105X9050C2TE3 (both ROHS3 compliant). For legacy system maintenance, RoHS non-compliant alternatives remain functionally equivalent.