T491B686M010AT4280 Equivalent & Substitute Parts

Part Overview

The T491B686M010AT4280 is a 68 µF molded tantalum capacitor manufactured by KEMET, rated for 10 V with ±20% tolerance. This surface mount component operates across the temperature range of -55°C to 125°C with a 2000-hour lifetime rating at 125°C. The part is housed in a 1411 (3528 Metric) package and features a 1 Ohm equivalent series resistance (ESR). The component maintains Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when equivalent electrical and mechanical parameters are required for design flexibility, inventory optimization, or component availability management. Substitutes must maintain compatibility across capacitance, voltage rating, package dimensions, and mounting specifications.

Substiute Parts

T491B686M010AT4280

KEMETIn Stock: 907T491B686M010AT4280 Datasheet

Current PartRFQ

T495B686K010ATE750

KEMETIn Stock: 1807T495B686K010ATE750 Datasheet

Parametric EquivalentRFQ

T495B686K010ATE900

KEMETIn Stock: 7066T495B686K010ATE900 Datasheet

Parametric EquivalentRFQ

T495B686M010ATE900

KEMETIn Stock: 1487T495B686M010ATE900 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the T491B686M010AT4280 is determined by strict adherence to the following parameters:

Critical Parameters (Must Match Exactly):

• Capacitance: 68 µF
• Voltage - Rated: 10 V
• 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
• Operating Temperature: -55°C ~ 125°C
• Lifetime @ Temp.: 2000 Hrs @ 125°C

Allowable Variation Parameters:

• Tolerance: ±20% or ±10% (tighter tolerance acceptable)
• ESR (Equivalent Series Resistance): 750mOhm to 1 Ohm @ 100kHz (lower ESR acceptable)
• Series: T491 or T495 (both KEMET molded tantalum series)

All substitute parts listed maintain identical electrical performance within the specified voltage and capacitance ratings while offering alternative tolerance and ESR characteristics suitable for general purpose applications.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and full RoHS3 compliance with REACH Unaffected designation, ensuring regulatory alignment with the original T491B686M010AT4280 component.

T495B686K010ATE750 offers the lowest ESR at 750mOhm @ 100kHz with ±10% tolerance, providing improved electrical performance characteristics while maintaining identical mechanical and thermal specifications.

T495B686K010ATE900 provides ±10% tolerance with 900mOhm @ 100kHz ESR, balancing tolerance precision with moderate ESR performance.

T495B686M010ATE900 maintains the ±20% tolerance specification of the original part while offering reduced ESR at 900mOhm @ 100kHz, providing direct functional equivalence with improved electrical characteristics.

All substitute parts are manufactured by KEMET and operate within the identical temperature range and lifetime rating. Selection between substitutes depends on application-specific requirements for tolerance precision and ESR performance within the 10 V, 68 µF capacitance specification.

Frequently Asked Questions (FAQ)

Q: Can T495B686K010ATE750 be used as a direct replacement for T491B686M010AT4280?

A: Yes. Both components share identical capacitance (68 µF), voltage rating (10 V), package dimensions (1411/3528 Metric), and thermal specifications. The T495B686K010ATE750 features ±10% tolerance and 750mOhm ESR compared to the original ±20% tolerance and 1 Ohm ESR. The tighter tolerance and lower ESR represent improved electrical performance within the same physical footprint.

Q: What is the difference between T495B686K010ATE900 and T495B686M010ATE900?

A: Both parts feature identical 68 µF capacitance, 10 V rating, 900mOhm ESR @ 100kHz, and package specifications. The primary difference is tolerance: T495B686K010ATE900 specifies ±10% tolerance, while T495B686M010ATE900 specifies ±20% tolerance. Selection depends on circuit requirements for capacitance precision.

Q: Are all substitute parts surface mount compatible with the original PCB layout?

A: Yes. All substitute parts utilize the 1411 (3528 Metric) package with identical dimensions of 0.138" L x 0.110" W (3.50mm x 2.80mm) and maximum seated height of 0.083" (2.10mm). PCB footprints and assembly processes remain unchanged.

Q: Do substitute parts maintain the same operating temperature range?

A: Yes. All substitute parts operate across -55°C to 125°C with 2000-hour lifetime rating at 125°C, identical to the original T491B686M010AT4280.

Q: What does ESR variation mean for circuit performance?

A: ESR (Equivalent Series Resistance) affects ripple current handling and voltage transient response. Lower ESR values (750mOhm) provide superior high-frequency performance compared to higher values (900mOhm or 1 Ohm). Selection depends on application-specific filtering and stability requirements.

Q: Are all parts RoHS3 compliant?

A: Yes. The original part and all substitute parts are RoHS3 compliant with REACH Unaffected status, meeting current environmental and regulatory requirements.