Equivalent & Substitute Parts for T491B106K016AT4021

Part Overview

The T491B106K016AT4021 is a 10 µF molded tantalum capacitor manufactured by KEMET, rated for 16 V with ±10% tolerance. This surface mount component operates across the temperature range of -55°C to 125°C with a lifetime specification of 2000 hours at 125°C. The part is housed in a 1411 (3528 Metric) package and features a 2Ohm equivalent series resistance (ESR). The T491B106K016AT4021 maintains Active product status and is ROHS3 compliant with Moisture Sensitivity Level 1 (unlimited shelf life).

Substitute parts are identified when design requirements, supply chain constraints, or manufacturing discontinuation necessitate alternative components that maintain electrical and mechanical compatibility within the specified parameter tolerances.

Substiute Parts

T491B106K016AT4021

KEMETIn Stock: 1117T491B106K016AT4021 Datasheet

Current PartRFQ

T491B106K016AT2478

KEMETIn Stock: 2999T491B106K016AT2478 Datasheet

Parametric EquivalentRFQ

T495B106K016ATE500

KEMETIn Stock: 3255T495B106K016ATE500 Datasheet

Parametric EquivalentRFQ

TAJB106K016HNJ

KYOCERA AVXIn Stock: 3149TAJB106K016HNJ Datasheet

Parametric EquivalentRFQ

TAJB106K016RY

KYOCERA AVXIn Stock: 2383TAJB106K016RY Datasheet

Parametric EquivalentRFQ

TCKIC106BT

Cal-Chip Electronics, Inc.In Stock: 128800TCKIC106BT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the T491B106K016AT4021 is determined by strict adherence to the following parameters:

Mandatory Matching Parameters:

• Capacitance: 10 µF (exact match required)
• Voltage Rating: 16 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)
• Type: Molded Tantalum (exact match required)

Compatible Variation Parameters:

• ESR (Equivalent Series Resistance): Variations permitted within electrical performance limits
• Manufacturer: Different manufacturers acceptable if all mandatory parameters match
• Packaging Format: Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® acceptable for same component
• RoHS Status: ROHS3 compliant preferred; non-compliant parts identified for awareness
• Lifetime @ Temp.: 2000 Hrs @ 125°C specification maintained across all substitutes

The four identified substitute parts meet all mandatory parameters while exhibiting variations in ESR specification and packaging format. These variations do not compromise functional compatibility in standard circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute - T491B106K016AT2478 (KEMET)

The T491B106K016AT2478 is the direct parametric equivalent to the T491B106K016AT4021. Both parts are manufactured by KEMET within the T491 series, share identical electrical specifications including 2Ohm ESR, and maintain ROHS3 compliance. This substitute is recommended as the first choice when supply of the primary part is unavailable. The difference in part number suffix (AT2478 versus AT4021) reflects internal manufacturing or packaging date codes without affecting functional performance.

Secondary Substitute - T495B106K016ATE500 (KEMET)

The T495B106K016ATE500 is a KEMET alternative from the T495 series with superior ESR performance (500mOhm @ 100kHz versus 2Ohm). This part maintains all critical electrical parameters and ROHS3 compliance. The lower ESR specification provides enhanced electrical performance in applications sensitive to impedance characteristics. Selection of this part is appropriate when improved high-frequency performance is beneficial to circuit operation.

Tertiary Substitute - TCKIC106BT (Cal-Chip Electronics)

The TCKIC106BT is manufactured by Cal-Chip Electronics and maintains all mandatory electrical and mechanical parameters with 2.8Ohm ESR. This part is ROHS3 compliant and offers the highest inventory availability (128,744 pieces). Selection is appropriate for high-volume applications or when extended supply chain security is required.

Alternative Substitute - TAJB106K016RY (KYOCERA AVX)

The TAJB106K016RY is manufactured by KYOCERA AVX within the TAJ series and meets all mandatory parameters. This part is ROHS3 compliant with Tape & Reel packaging. ESR specification is not provided in available documentation. This substitute is suitable when KYOCERA AVX supply chain preference exists.

Non-Compliant Alternative - TAJB106K016HNJ (KYOCERA AVX)

The TAJB106K016HNJ is manufactured by KYOCERA AVX and meets all mandatory electrical and mechanical parameters with 2.8Ohm ESR @ 100kHz. This part is RoHS non-compliant and is available in Cut Tape (CT) & Digi-Reel® packaging format. Selection of this part requires explicit approval for applications where RoHS compliance is not mandated.

Frequently Asked Questions (FAQ)

Q: Can I substitute T491B106K016AT4021 with any of these parts without circuit redesign?

A: Yes. All identified substitute parts maintain identical capacitance (10 µF), voltage rating (16 V), tolerance (±10%), package (1411 / 3528 Metric), and operating temperature range (-55°C to 125°C). Direct substitution is electrically and mechanically compatible without circuit modification.

Q: What is the significance of ESR differences between the main part and substitutes?

A: ESR (Equivalent Series Resistance) affects high-frequency impedance and ripple current handling. The main part specifies 2Ohm; substitutes range from 500mOhm to 2.8Ohm. Lower ESR (T495B106K016ATE500 at 500mOhm) provides superior high-frequency performance. Higher ESR values (TAJB106K016HNJ at 2.8Ohm) remain within acceptable performance for general-purpose applications. ESR differences do not prevent substitution in standard circuit applications.

Q: Are there packaging format differences I should consider?

A: Most substitutes are supplied in Tape & Reel (TR) format, matching the main part. The exception is TAJB106K016HNJ, which is available in Cut Tape (CT) & Digi-Reel® format. Both formats are compatible with standard surface mount assembly equipment. Verify your assembly process compatibility with the selected packaging format.

Q: Which substitute should I select for RoHS-compliant applications?

A: Five of the six identified substitutes are ROHS3 compliant: T491B106K016AT2478, T495B106K016ATE500, TAJB106K016RY, and TCKIC106BT. The TAJB106K016HNJ is RoHS non-compliant and must not be used in applications requiring RoHS certification. Verify your application's regulatory requirements before final part selection.

Q: What is the difference between T491B106K016AT4021 and T491B106K016AT2478?

A: Both parts are manufactured by KEMET within the T491 series with identical electrical specifications (10 µF, 16 V, ±10%, 2Ohm ESR). The suffix difference (AT4021 versus AT2478) represents internal manufacturing or date code variations. Functionally, these parts are equivalent and directly interchangeable.

Q: Why does TCKIC106BT have significantly higher inventory availability?

A: TCKIC106BT is manufactured by Cal-Chip Electronics and maintains higher stock levels (128,744 pieces) compared to other substitutes. This availability advantage makes it suitable for high-volume production runs or applications requiring extended supply chain security.

Q: Can I use TAJB106K016HNJ in my design if RoHS compliance is not required?

A: Yes. TAJB106K016HNJ meets all mandatory electrical and mechanical parameters and is functionally equivalent. However, explicit approval from design and procurement is required for non-compliant component selection. Verify that your application, customer requirements, and regulatory environment permit RoHS non-compliant components.

Q: How do I determine which substitute is best for my specific application?

A: Selection criteria are: (1) RoHS compliance requirement - eliminates TAJB106K016HNJ if compliance is mandatory; (2) ESR sensitivity - select T495B106K016ATE500 for high-frequency applications requiring lower impedance; (3) Supply chain preference - TCKIC106BT for high-volume availability, KEMET parts for brand consistency, KYOCERA AVX for alternative sourcing; (4) Packaging format - verify assembly equipment compatibility with Tape & Reel or Cut Tape formats.