T491B475K010AS Equivalent & Substitute Parts

Part Overview

The T491B475K010AS is a 4.7 µF molded tantalum capacitor rated at 10 V with ±10% tolerance, manufactured by KEMET in the 1411 (3528 Metric) package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -55°C to 125°C and features a 3.5 Ohm equivalent series resistance (ESR) in a surface mount configuration.

Substiute Parts

T491B475K010AS

KEMETIn Stock: 1181T491B475K010AS Datasheet

Current PartRFQ

T491B475K010AT

KEMETIn Stock: 7156T491B475K010AT Datasheet

DirectRFQ

293D475X9010B2TE3

Vishay SpragueIn Stock: 3761293D475X9010B2TE3 Datasheet

SimilarRFQ

TAJB475K010H

KYOCERA AVXIn Stock: 859TAJB475K010H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the T491B475K010AS is determined by strict equivalence across the following parameters:

• Capacitance Value: 4.7 µF (exact match required)
• Voltage Rating: 10 V (exact match required)
• Tolerance: ±10% (exact match required)
• Package / Case: 1411 (3528 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Substitute parts may vary in ESR within acceptable operational limits and differ in product status or compliance certifications. All identified substitutes maintain identical electrical specifications and physical footprint compatibility.

Parameter Comparison

Engineering Selection Recommendations

T491B475K010AT (KEMET - Direct Substitute)

This part is the primary recommended substitute. It is manufactured by the same supplier as the original component, maintains identical electrical and mechanical specifications, and carries Active product status. The T491B475K010AT is ROHS3 compliant and features a rated lifetime of 2000 hours at 125°C. Inventory availability is substantial at 7081 pieces. This substitute provides direct compatibility with no design modifications required.

293D475X9010B2TE3 (Vishay Sprague - Cross-Manufacturer Substitute)

This part meets all electrical and mechanical equivalence criteria with a marginally lower ESR of 3.4 Ohm compared to the original 3.5 Ohm specification. Manufactured by Vishay Sprague under the TANTAMOUNT™ series, it is ROHS3 compliant and carries Active product status. Inventory availability is 3728 pieces. The ESR differential is within acceptable operational tolerance for general-purpose tantalum capacitor applications.

TAJB475K010H (KYOCERA AVX - Cross-Manufacturer Substitute)

This part maintains electrical equivalence with an ESR of 4 Ohm, which is within acceptable variance for this component category. Manufactured by KYOCERA AVX under the TAJ series, it carries Active product status. However, this part is RoHS non-compliant, matching the compliance status of the original obsolete component. Inventory availability is 801 pieces. Selection of this substitute should be evaluated against design compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can T491B475K010AT be used as a direct replacement for T491B475K010AS?

A: Yes. The T491B475K010AT is electrically and mechanically equivalent to the T491B475K010AS. Both parts share identical capacitance (4.7 µF), voltage rating (10 V), tolerance (±10%), package (1411/3528 Metric), ESR (3.5 Ohm), and operating temperature range (-55°C to 125°C). The primary difference is product status: T491B475K010AT is Active while T491B475K010AS is Obsolete.

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

A: ESR (Equivalent Series Resistance) affects ripple current handling and thermal performance. The main part and T491B475K010AT both specify 3.5 Ohm. The 293D475X9010B2TE3 specifies 3.4 Ohm (0.1 Ohm lower), and TAJB475K010H specifies 4 Ohm (0.5 Ohm higher). These variations remain within acceptable operational parameters for general-purpose tantalum capacitor applications in the 4.7 µF, 10 V category.

Q: Are all substitute parts RoHS compliant?

A: No. T491B475K010AT and 293D475X9010B2TE3 are ROHS3 compliant. TAJB475K010H is RoHS non-compliant, matching the compliance status of the original T491B475K010AS. Design requirements and regulatory obligations should determine which substitute is appropriate for your application.

Q: Do all substitutes fit the same PCB footprint?

A: Yes. All substitute parts use the 1411 (3528 Metric) package with identical dimensions: 0.138" L × 0.110" W (3.50mm × 2.80mm) and maximum seated height of 0.083" (2.10mm). No PCB layout modifications are required when substituting any of these parts.

Q: What is the difference between packaging options listed for these parts?

A: T491B475K010AS and TAJB475K010H do not specify packaging format. T491B475K010AT is available in Cut Tape (CT) & Digi-Reel® format. 293D475X9010B2TE3 is supplied in Tape & Reel (TR) format. Packaging selection depends on procurement volume and assembly process requirements.

Q: Can I use TAJB475K010H if my design does not require RoHS compliance?

A: Yes. TAJB475K010H meets all electrical and mechanical equivalence criteria. The 4 Ohm ESR specification is within acceptable tolerance for this capacitor category. Selection should be based on inventory availability, cost considerations, and supplier preference, provided RoHS compliance is not a design requirement.