F971A685KBA Equivalent & Substitute Parts

Part Overview

The F971A685KBA is a 6.8 µF molded tantalum capacitor manufactured by KYOCERA AVX, rated for 10 V operation in a 1411 (3528 Metric) surface mount package. This component is designed for applications requiring compact, high-reliability capacitive storage with automotive-grade performance. The part is currently active in production with full inventory availability. Substitute parts are identified when equivalent electrical specifications, mechanical dimensions, and compliance certifications align with the original component requirements.

Substiute Parts

F971A685KBA

KYOCERA AVXIn Stock: 886F971A685KBA Datasheet

Current PartRFQ

T491B685K010AT

KEMETIn Stock: 53389T491B685K010AT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the F971A685KBA is determined by strict alignment of the following parameters:

• Capacitance value: 6.8 µF (exact match required)
• Tolerance: ±10% (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 or wider range acceptable)
• RoHS compliance: ROHS3 Compliant (required for regulatory equivalence)

The T491B685K010AT from KEMET meets all substitution criteria. Variations in ESR (Equivalent Series Resistance), MSL rating, and lifetime specifications do not disqualify a part from substitution eligibility, as these parameters fall within acceptable operational tolerances for general circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The T491B685K010AT is a direct electrical and mechanical equivalent to the F971A685KBA. Both components are active products with ROHS3 compliance and identical electrical ratings. The primary difference is ESR specification: the F971A685KBA specifies 2.5 Ohm while the T491B685K010AT specifies 4.6 Ohm. This variance remains within acceptable operational parameters for standard circuit applications. The T491B685K010AT offers significantly higher inventory availability (53,300 units versus 872 units), making it a practical alternative for high-volume procurement scenarios. Both parts are suitable for automotive and high-reliability applications based on their respective product certifications.

Frequently Asked Questions (FAQ)

Q: Can the T491B685K010AT replace the F971A685KBA in my circuit?

A: Yes. Both components share identical capacitance (6.8 µF), tolerance (±10%), voltage rating (10 V), package (1411 / 3528 Metric), and operating temperature range (-55°C ~ 125°C). The ESR difference (2.5 Ohm versus 4.6 Ohm) does not prevent functional substitution in standard applications.

Q: Are there physical compatibility concerns between these parts?

A: No. Both parts use the 1411 (3528 Metric) package with identical footprint dimensions (0.138" L x 0.110" W). The seated height difference (0.091" versus 0.083") is negligible for PCB assembly and does not affect placement or clearance.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the F971A685KBA and T491B685K010AT are ROHS3 compliant and REACH unaffected, meeting equivalent regulatory requirements.

Q: What is the significance of the ESR difference?

A: ESR (Equivalent Series Resistance) affects ripple current handling and thermal performance. The F971A685KBA specifies 2.5 Ohm while the T491B685K010AT specifies 4.6 Ohm. This difference is within acceptable tolerance for general-purpose applications but should be evaluated if the circuit operates under high ripple current conditions.

Q: Which part should I select for new designs?

A: Selection should be based on availability, lead time, and cost considerations. Both parts are active products with full compliance certifications. The T491B685K010AT offers superior inventory availability for immediate procurement.