T491B686K006AT4280 Equivalent & Substitute Parts

Part Overview

The T491B686K006AT4280 is a 68 µF molded tantalum capacitor manufactured by KEMET, rated for 6.3 V operation in a 1411 (3528 Metric) surface mount package. This component is classified as Active product status and is designed for general-purpose applications requiring stable capacitance and low equivalent series resistance in compact form factors.

Substitute parts become necessary due to supply chain constraints, inventory availability, or procurement preferences while maintaining identical electrical and mechanical performance characteristics. The substitute identified for this component meets all critical electrical specifications and physical packaging requirements.

Substiute Parts

T491B686K006AT4280

KEMETIn Stock: 844T491B686K006AT4280 Datasheet

Current PartRFQ

TCKOJ686BT

Cal-Chip Electronics, Inc.In Stock: 56871TCKOJ686BT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the T491B686K006AT4280 with the TCKOJ686BT is valid based on the following critical parameters that determine functional equivalence:

Electrical Parameters (Must Match Exactly):

• Capacitance: 68 µF
• Voltage Rating: 6.3 V
• Tolerance: ±10%
• ESR: 900 mOhm
• Operating Temperature Range: -55°C to 125°C
• Lifetime @ 125°C: 2000 Hrs

Mechanical Parameters (Must Match Exactly):

• Package / Case: 1411 (3528 Metric)
• Size / Dimension: 0.138" L x 0.110" W (3.50mm x 2.80mm)
• Height - Seated (Max): 0.083" (2.10mm)
• Mounting Type: Surface Mount
• Packaging: Tape & Reel (TR)

Compliance Parameters (Must Match Exactly):

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

The substitute part TCKOJ686BT from Cal-Chip Electronics, Inc. satisfies all electrical, mechanical, and compliance requirements, enabling direct substitution in circuit designs and PCB layouts without modification.

Parameter Comparison

Engineering Selection Recommendations

Both the T491B686K006AT4280 and TCKOJ686BT are Active product status components with full ROHS3 compliance and REACH Unaffected status, ensuring regulatory compliance for current and future applications. The substitute part maintains identical electrical performance characteristics, including capacitance, voltage rating, tolerance, and ESR specifications.

Selection between these components should be based on:

Availability and Lead Time: The TCKOJ686BT currently maintains higher inventory levels (56,800 Pcs) compared to the T491B686K006AT4280 (789 Pcs), making it suitable for applications with extended procurement timelines or high-volume requirements.

Supply Chain Continuity: Both manufacturers maintain Active product status, ensuring long-term availability and continued support for production environments.

Compliance Requirements: Both components satisfy ROHS3 and REACH requirements, with MSL 1 rating indicating unlimited shelf life under standard storage conditions.

PCB Integration: Identical package dimensions, height specifications, and surface mount characteristics ensure direct substitution without PCB redesign or assembly process modification.

Frequently Asked Questions (FAQ)

Q: Can the TCKOJ686BT be used as a direct replacement for the T491B686K006AT4280 in existing designs?

A: Yes. The TCKOJ686BT is a parametric equivalent with identical electrical specifications (68 µF, 6.3 V, ±10% tolerance, 900 mOhm ESR), mechanical dimensions (1411 package, 3.50mm x 2.80mm x 2.10mm), and compliance certifications. No circuit modifications or PCB layout changes are required.

Q: Are there any differences in the package or mounting characteristics?

A: No. Both components use the 1411 (3528 Metric) surface mount package with identical footprint dimensions and height specifications. Both are supplied in Tape & Reel (TR) packaging format.

Q: What is the significance of the MSL 1 rating for both parts?

A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life under standard storage conditions. Both components do not require special moisture control measures during storage or handling, simplifying inventory management and reducing procurement complexity.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the T491B686K006AT4280 and TCKOJ686BT are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory standards for electronic component manufacturing and use.

Q: What is the operating temperature range for both components?

A: Both components operate across the temperature range of -55°C to 125°C with a rated lifetime of 2000 hours at 125°C, ensuring reliable performance in industrial and commercial applications.

Q: Are there any differences in ESR or electrical performance between the two parts?

A: No. Both components have identical ESR specifications of 900 mOhm, ensuring equivalent performance in filtering, decoupling, and energy storage applications.