T491B686K004AT7280 Equivalent & Substitute Parts

Part Overview

The T491B686K004AT7280 is a 68 µF molded tantalum capacitor manufactured by KEMET, rated for 4 V operation. This component belongs to the T491 series and is designed for general-purpose surface mount applications in the 1411 (3528 Metric) package format. The part is currently in active production status with 739 units available in stock.

Substitute parts are identified to provide design flexibility, supply chain alternatives, and inventory optimization while maintaining electrical and mechanical compatibility within specified parameters.

Substiute Parts

T491B686K004AT7280

KEMETIn Stock: 821T491B686K004AT7280 Datasheet

Current PartRFQ

TCKOG686BT

Cal-Chip Electronics, Inc.In Stock: 56904TCKOG686BT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the T491B686K004AT7280 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Capacitance value: 68 µF (exact match required)
• Voltage rating: 4 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)
• Lifetime specification: 2000 Hrs @ 125°C (exact match required)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

The substitute part TCKOG686BT from Cal-Chip Electronics, Inc. meets all critical electrical and mechanical parameters. Minor variations in ESR (1.7 Ohm versus 1.8 Ohm) remain within acceptable operational tolerances for general-purpose applications and do not affect substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

Both the T491B686K004AT7280 and TCKOG686BT are active production components with full regulatory compliance. Selection between these parts should be based on the following factors:

Availability and Lead Time: The TCKOG686BT offers significantly higher inventory availability (56,813 units in stock) compared to the T491B686K004AT7280 (739 units in stock). This difference may influence procurement decisions for high-volume applications or time-sensitive projects.

Regulatory Compliance: Both parts maintain compliance with RoHS and REACH regulations. The T491B686K004AT7280 carries ROHS3 certification, while the TCKOG686BT carries standard RoHS certification. Both are suitable for applications requiring environmental compliance.

Electrical Performance: The ESR differential (1.7 Ohm versus 1.8 Ohm) represents a 5.6% variation and remains within acceptable operational parameters for general-purpose tantalum capacitor applications. This minor difference does not impact functional compatibility.

Manufacturer Considerations: Component selection may be influenced by existing supplier relationships, quality agreements, or design documentation requirements specific to KEMET or Cal-Chip Electronics products.

Frequently Asked Questions (FAQ)

Q: Can TCKOG686BT be used as a direct replacement for T491B686K004AT7280 in existing designs?

A: Yes. Both components share identical electrical specifications (68 µF, 4 V, ±10% tolerance), mechanical dimensions (1411 package, 3.50mm x 2.80mm), and operating characteristics (-55°C to 125°C, 2000 Hrs @ 125°C). The components are pin-compatible and footprint-compatible for surface mount assembly.

Q: What is the significance of the ESR difference between these parts?

A: The ESR (Equivalent Series Resistance) difference of 0.1 Ohm (1.7 Ohm versus 1.8 Ohm) is a 5.6% variation. For general-purpose applications, this difference is negligible and does not affect circuit performance. Applications with specific ESR requirements should reference detailed circuit analysis.

Q: Are both parts suitable for high-temperature applications?

A: Yes. Both components operate across the identical temperature range of -55°C to 125°C and maintain a 2000-hour lifetime specification at 125°C. They are suitable for applications requiring extended temperature operation within this range.

Q: What packaging format is used for both parts?

A: Both the T491B686K004AT7280 and TCKOG686BT are supplied in Tape & Reel (TR) packaging in the 1411 (3528 Metric) case format. This packaging is standard for automated surface mount assembly processes.

Q: Do these parts require different handling or storage procedures?

A: Both components carry Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage procedures for molded tantalum capacitors apply to both parts.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are RoHS and REACH compliant. The T491B686K004AT7280 carries ROHS3 certification, while the TCKOG686BT carries standard RoHS certification. Both meet current environmental regulatory requirements for electronic components.