T491B686M010AT4380 Equivalent & Substitute Parts

Part Overview

The T491B686M010AT4380 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). This component is Active in product status and fully compliant with RoHS3 and REACH regulations. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design optimization, or performance specifications.

Substiute Parts

T491B686M010AT4380

KEMETIn Stock: 1086T491B686M010AT4380 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 of the T491B686M010AT4380 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Capacitance: 68 µF (exact match required)
• Voltage Rating: 10 V (exact match required)
• Package / Case: 1411 (3528 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Lifetime @ Temp.: 2000 Hrs @ 125°C (exact match required)

Allowable Variation Parameters:

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

All substitute parts maintain identical physical dimensions (0.138" L x 0.110" W / 3.50mm x 2.80mm) and maximum seated height (0.083" / 2.10mm). All substitute parts are Active in product status and maintain RoHS3 compliance and MSL 1 rating.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—T495B686K010ATE750, T495B686K010ATE900, and T495B686M010ATE900—are direct functional equivalents to the T491B686M010AT4380 based on electrical and mechanical compatibility.

T495B686K010ATE750 provides the lowest ESR at 750 mOhm @ 100 kHz with ±10% tolerance. This part is suitable for applications requiring reduced equivalent series resistance while maintaining the ±20% tolerance specification of the original part.

T495B686K010ATE900 offers ±10% tolerance with 900 mOhm ESR @ 100 kHz. This part provides improved capacitance tolerance compared to the main part while maintaining acceptable ESR performance.

T495B686M010ATE900 maintains the ±20% tolerance of the original part with 900 mOhm ESR @ 100 kHz. This part provides the closest tolerance match to the T491B686M010AT4380.

All substitute parts are Active in product status, RoHS3 compliant, and maintain MSL 1 (Unlimited) moisture sensitivity rating. All parts are housed in identical 1411 (3528 Metric) packages with matching physical dimensions and thermal specifications. Selection between substitute parts depends on ESR and tolerance requirements specific to the application circuit.

Frequently Asked Questions (FAQ)

Q: Can T495B686K010ATE750 replace T491B686M010AT4380 in all applications?

A: T495B686K010ATE750 is electrically and mechanically compatible with T491B686M010AT4380. Both parts share identical capacitance (68 µF), voltage rating (10 V), package (1411 / 3528 Metric), operating temperature range (-55°C ~ 125°C), and lifetime specification (2000 Hrs @ 125°C). The T495B686K010ATE750 features lower ESR (750 mOhm @ 100 kHz versus 1 Ohm) and tighter tolerance (±10% versus ±20%), making it suitable for applications where reduced ESR is beneficial.

Q: What is the difference between T495B686K010ATE900 and T495B686M010ATE900?

A: Both parts are identical except for tolerance specification. T495B686K010ATE900 features ±10% tolerance, while T495B686M010ATE900 features ±20% tolerance. Both parts have 900 mOhm ESR @ 100 kHz. Selection depends on the tolerance requirement of the application circuit.

Q: Are all substitute parts physically interchangeable with T491B686M010AT4380?

A: Yes. All substitute parts are housed in the 1411 (3528 Metric) package with identical physical dimensions (0.138" L x 0.110" W / 3.50mm x 2.80mm) and maximum seated height (0.083" / 2.10mm). All parts are surface mount components with identical lead spacing and mounting characteristics.

Q: Do substitute parts maintain the same thermal and reliability specifications?

A: Yes. All substitute parts operate across the identical temperature range (-55°C ~ 125°C) and maintain the same lifetime specification (2000 Hrs @ 125°C). All parts are Active in product status and maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the significance of ESR differences between substitute parts?

A: ESR (Equivalent Series Resistance) affects circuit performance in high-frequency applications and ripple current handling. T495B686K010ATE750 features the lowest ESR at 750 mOhm @ 100 kHz, while T491B686M010AT4380 features 1 Ohm ESR. Lower ESR reduces voltage ripple and heat generation in the capacitor. Selection depends on circuit requirements for ESR performance.

Q: Can substitute parts be mixed in the same design or assembly?

A: All substitute parts meet identical electrical and mechanical specifications for the critical parameters (capacitance, voltage, package, temperature range, lifetime). Parts may be used interchangeably based on application requirements for tolerance and ESR specifications. Design documentation should specify which part number is acceptable for the application.