T494D106K025AS Equivalent & Substitute Parts

Part Overview

The T494D106K025AS is a 10 µF molded tantalum capacitor manufactured by KEMET, rated for 25 V operation in a 2917 (7343 Metric) surface mount package. This component is classified as obsolete, indicating discontinuation from the manufacturer's active product line. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this capacitor specification.

Substiute Parts

T494D106K025AS

KEMETIn Stock: 949T494D106K025AS Datasheet

Current PartRFQ

T494D106K025AT

KEMETIn Stock: 380414T494D106K025AT Datasheet

DirectRFQ

TAJD106K025H

KYOCERA AVXIn Stock: 1234TAJD106K025H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the T494D106K025AS are identified based on strict electrical and mechanical parameter matching within the molded tantalum capacitor category. The substitution logic is based on the following critical parameters:

Electrical Parameters (Must Match):

• Capacitance: 10 µF
• Voltage Rating: 25 V
• Tolerance: ±10%
• Operating Temperature Range: -55°C ~ 125°C

Mechanical Parameters (Must Match):

• Package / Case: 2917 (7343 Metric)
• Mounting Type: Surface Mount
• Type: Molded Tantalum

Secondary Parameters (Allowable Variation):

• ESR (Equivalent Series Resistance): Variation permitted within manufacturer specifications
• Lifetime @ Temperature: Variation permitted based on manufacturer design
• Product Status: Active status preferred for ongoing availability

Parts meeting all electrical and mechanical parameters are classified as direct substitutes. Parts with identical electrical specifications but different ESR characteristics are classified as similar substitutes, with ESR differences noted for circuit performance evaluation.

Parameter Comparison

Engineering Selection Recommendations

T494D106K025AT (Direct Substitute - Recommended Primary Choice)

The T494D106K025AT is a direct substitute for the T494D106K025AS. Both parts are manufactured by KEMET within the T494 series and share identical electrical specifications, mechanical dimensions, and ESR characteristics. The T494D106K025AT maintains active product status, ensuring ongoing availability and supply chain support. The T494D106K025AT achieves ROHS3 compliance, providing regulatory advantage for new designs and systems subject to RoHS requirements. Packaging is available in Cut Tape (CT) and Digi-Reel® formats, supporting both manual and automated assembly processes. This part is the optimal choice for direct replacement applications.

TAJD106K025H (Similar Substitute - Alternative Option)

The TAJD106K025H is manufactured by KYOCERA AVX and meets all electrical and mechanical specifications of the T494D106K025AS. This part is classified as a similar substitute due to ESR variation: the TAJD106K025H exhibits 1.2 Ohm ESR compared to the 400 mOhm ESR of the main part. This ESR difference results in higher equivalent series resistance and may affect circuit performance in applications sensitive to impedance characteristics, particularly in high-frequency filtering or low-impedance power supply circuits. The TAJD106K025H maintains active product status and MSL 1 rating. Selection of this part requires circuit-level evaluation of ESR impact on system performance.

Frequently Asked Questions (FAQ)

Q: Can T494D106K025AT be used as a direct replacement for T494D106K025AS?

A: Yes. The T494D106K025AT is a direct substitute. Both parts share identical capacitance (10 µF), voltage rating (25 V), tolerance (±10%), package (2917 / 7343 Metric), operating temperature range (-55°C ~ 125°C), and ESR (400 mOhm). The primary difference is product status: T494D106K025AS is obsolete while T494D106K025AT is active, ensuring supply availability.

Q: What is the significance of the ESR difference between T494D106K025AS and TAJD106K025H?

A: ESR (Equivalent Series Resistance) affects capacitor impedance and heat dissipation. The T494D106K025AS has 400 mOhm ESR while TAJD106K025H has 1.2 Ohm ESR. The TAJD106K025H exhibits approximately 3 times higher ESR. In applications with high ripple current or high-frequency switching, this difference may impact voltage ripple, thermal performance, and circuit stability. Circuit analysis is required to determine acceptability.

Q: Are all three parts mechanically interchangeable?

A: Yes. All three parts (T494D106K025AS, T494D106K025AT, and TAJD106K025H) share identical package specifications: 2917 (7343 Metric) case, 0.287" L x 0.169" W (7.30mm x 4.30mm) dimensions, and 0.122" (3.10mm) maximum seated height. All are surface mount components with identical footprint requirements.

Q: What is the difference between Cut Tape (CT) and Digi-Reel® packaging?

A: Cut Tape (CT) packaging provides components in tape format cut to specified lengths, suitable for manual assembly and small-quantity applications. Digi-Reel® is a proprietary reel format optimized for automated pick-and-place assembly equipment. Both formats contain identical components; packaging selection depends on assembly process requirements.

Q: Does RoHS compliance affect functional performance?

A: RoHS compliance addresses material composition and environmental regulations, not functional performance. The T494D106K025AT (ROHS3 compliant) and T494D106K025AS (RoHS non-compliant) perform identically in circuit operation. RoHS status is relevant for regulatory compliance, supply chain requirements, and system certifications, not electrical characteristics.

Q: Can TAJD106K025H be used in all applications where T494D106K025AS is specified?

A: TAJD106K025H meets all electrical and mechanical specifications but exhibits higher ESR (1.2 Ohm vs. 400 mOhm). Applications with strict ESR requirements, high ripple current demands, or high-frequency filtering may not tolerate this ESR increase. Circuit-level evaluation is required before substitution.

Q: What is Moisture Sensitivity Level (MSL) 1?

A: MSL 1 indicates unlimited moisture sensitivity, meaning the component can be stored indefinitely without moisture control measures. All three parts carry MSL 1 rating, eliminating moisture management as a substitution consideration.