T491B686K006AH Equivalent & Substitute Parts

Part Overview

The T491B686K006AH 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 are identified to address inventory availability, compliance requirements, or supply chain continuity while maintaining electrical and mechanical compatibility.

Substiute Parts

T491B686K006AH

KEMETIn Stock: 963T491B686K006AH Datasheet

Current PartRFQ

TCKOJ686BT

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the T491B686K006AH are identified based on strict electrical and mechanical parameter matching. The substitution criteria are:

Critical Parameters for Substitution:

• Capacitance: 68 µF (exact match required)
• Tolerance: ±10% (exact match required)
• Voltage - Rated: 6.3 V (exact match required)
• Type: Molded tantalum (exact match required)
• ESR: 900 mOhm (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Lifetime @ 125°C: 2000 Hrs (exact match required)
• Package / Case: 1411 (3528 Metric) (exact match required)
• Physical Dimensions: 0.138" L x 0.110" W, Height 0.083" max (exact match required)
• Mounting Type: Surface Mount (exact match required)
• MSL: 1 (Unlimited) (exact match required)

The TCKOJ686BT from Cal-Chip Electronics, Inc. meets all critical electrical and mechanical parameters, confirming its status as a parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

T491B686K006AH (KEMET): This part is Active product status. RoHS non-compliant. REACH Unaffected. Suitable for applications where KEMET sourcing is specified or preferred.

TCKOJ686BT (Cal-Chip Electronics, Inc.): This part is Active product status. RoHS3 Compliant. REACH Unaffected. Recommended for applications requiring RoHS3 compliance. Higher inventory availability (56,800 Pcs) compared to T491B686K006AH (877 Pcs) supports supply chain continuity.

Both parts are electrically and mechanically interchangeable based on provided specifications. Selection between them depends on compliance requirements and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can TCKOJ686BT replace T491B686K006AH in all applications?

A: Yes, based on electrical and mechanical parameters. Both parts share identical capacitance (68 µF), tolerance (±10%), voltage rating (6.3 V), ESR (900 mOhm), operating temperature range (-55°C to 125°C), lifetime rating (2000 Hrs @ 125°C), package type (1411/3528 Metric), and physical dimensions. The primary difference is RoHS compliance status: TCKOJ686BT is RoHS3 Compliant while T491B686K006AH is RoHS non-compliant.

Q: Are there physical compatibility concerns with PCB assembly?

A: No. Both parts use identical Surface Mount package specifications: 1411 (3528 Metric) with dimensions 0.138" L x 0.110" W (3.50mm x 2.80mm) and maximum seated height of 0.083" (2.10mm). PCB footprints and reflow profiles are compatible.

Q: What is the significance of MSL 1 (Unlimited)?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life without moisture bake-out requirements. Both parts share this specification, eliminating moisture sensitivity as a substitution constraint.

Q: How do the inventory levels affect substitution decisions?

A: TCKOJ686BT has significantly higher inventory (56,800 Pcs) compared to T491B686K006AH (877 Pcs). For applications requiring large quantities or long-term supply assurance, TCKOJ686BT provides better availability.

Q: Are there compliance differences between the two parts?

A: Yes. TCKOJ686BT is RoHS3 Compliant, while T491B686K006AH is RoHS non-compliant. Both are REACH Unaffected. Applications subject to RoHS3 requirements must use TCKOJ686BT.