T491B686K010AH Equivalent & Substitute Parts

Part Overview

The T491B686K010AH is a 68 µF molded tantalum capacitor manufactured by KEMET, rated for 10 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 when the primary part number reaches end-of-life status, inventory constraints occur, or when design requirements permit operation with alternative electrical characteristics within the same mechanical and functional envelope. The substitute parts listed maintain identical capacitance, voltage rating, package dimensions, and operating temperature range while offering improved compliance certifications and alternative ESR specifications.

Substiute Parts

T491B686K010AH

KEMETIn Stock: 874T491B686K010AH Datasheet

Current PartRFQ

T495B686K010ATE750

KEMETIn Stock: 1807T495B686K010ATE750 Datasheet

Parametric EquivalentRFQ

T495B686K010ATE900

KEMETIn Stock: 7066T495B686K010ATE900 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the T491B686K010AH is determined by strict adherence to the following parameters:

Mandatory Matching Parameters:

• Capacitance: 68 µF
• Voltage Rating: 10 V
• Tolerance: ±10%
• Package / Case: 1411 (3528 Metric)
• Physical Dimensions: 0.138" L x 0.110" W (3.50mm x 2.80mm)
• Height - Seated (Max): 0.083" (2.10mm)
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C ~ 125°C
• Lifetime @ Temp.: 2000 Hrs @ 125°C
• Type: Molded
• Moisture Sensitivity Level: 1 (Unlimited)

Variable Parameters Permitting Substitution:

• ESR (Equivalent Series Resistance): The main part specifies 1 Ohm; substitute parts specify ESR at 100 kHz (750 mOhm and 900 mOhm respectively). These variations remain within acceptable operational parameters for general purpose tantalum capacitor applications.
• RoHS Status: The main part is RoHS non-compliant; substitute parts are ROHS3 Compliant. This difference reflects manufacturing process improvements and regulatory evolution.
• Series Designation: Main part is T491 series; substitutes are T495 series. Both series share identical electrical and mechanical specifications for this capacitance and voltage rating.

All substitute parts maintain full compatibility with the original design envelope and electrical requirements.

Parameter Comparison

Engineering Selection Recommendations

T495B686K010ATE750 Selection Criteria:

The T495B686K010ATE750 is suitable for applications where ROHS3 compliance is required and lower ESR (750 mOhm @ 100kHz) is beneficial. This part offers improved regulatory alignment compared to the T491B686K010AH while maintaining identical mechanical and thermal specifications. Current inventory availability is 1789 pieces.

T495B686K010ATE900 Selection Criteria:

The T495B686K010ATE900 provides ROHS3 compliance with slightly higher ESR (900 mOhm @ 100kHz) compared to the T495B686K010ATE750. This part is suitable for general purpose applications where ESR tolerance is within acceptable design margins. Current inventory availability is 7055 pieces, providing superior supply chain continuity.

Primary Recommendation:

For new designs or applications requiring regulatory compliance, either T495 series substitute part is appropriate. The T495B686K010ATE900 offers the highest inventory availability and maintains full electrical and mechanical compatibility with the original T491B686K010AH specification.

Frequently Asked Questions (FAQ)

Q: Can T495B686K010ATE750 and T495B686K010ATE900 be used interchangeably with T491B686K010AH?

A: Yes. All three parts share identical capacitance (68 µF), voltage rating (10 V), tolerance (±10%), package dimensions (1411/3528 Metric), operating temperature range (-55°C ~ 125°C), and lifetime specifications (2000 Hrs @ 125°C). The ESR differences (1 Ohm versus 750 mOhm and 900 mOhm @ 100kHz) are within acceptable operational parameters for general purpose tantalum capacitor applications.

Q: What is the difference between T491 and T495 series?

A: Both series are manufactured by KEMET and share identical electrical and mechanical specifications for this capacitance and voltage rating. The primary difference is regulatory compliance: T491 series is RoHS non-compliant, while T495 series is ROHS3 Compliant. The T495 series represents the current manufacturing standard.

Q: Does ESR variation affect circuit performance?

A: ESR differences between the parts (1 Ohm for T491B686K010AH versus 750-900 mOhm @ 100kHz for T495 variants) are specified by the manufacturer and remain within acceptable ranges for general purpose applications. Circuit designers should verify ESR requirements against specific application demands if ripple current or thermal performance are critical parameters.

Q: Are all three parts available in the same packaging format?

A: Yes. All three parts are supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes. Physical dimensions and mounting characteristics are identical across all three part numbers.

Q: What is the significance of MSL Level 1?

A: Moisture Sensitivity Level 1 (Unlimited) indicates that these molded tantalum capacitors have no moisture sensitivity restrictions. Components can be stored and handled without special moisture control measures, simplifying supply chain management and reducing handling costs.

Q: Which substitute part should be selected for maximum inventory availability?

A: T495B686K010ATE900 currently has 7055 pieces in stock, compared to 1789 pieces for T495B686K010ATE750. For applications where supply chain continuity is a priority, T495B686K010ATE900 is the preferred selection.