F971C685MBAHT3 Equivalent & Substitute Parts

Part Overview

The F971C685MBAHT3 is a 6.8 µF molded tantalum capacitor rated at 16 V, manufactured by KYOCERA AVX in the 1411 (3528 Metric) package. This component is designed for surface mount applications requiring high reliability in automotive environments. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.

Substiute Parts

F971C685MBAHT3

KYOCERA AVXIn Stock: 757F971C685MBAHT3 Datasheet

Current PartRFQ

T491B685M006AT

KEMETIn Stock: 2977T491B685M006AT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the F971C685MBAHT3 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Capacitance: 6.8 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Package / Case: 1411 (3528 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)

Voltage Rating Consideration: The F971C685MBAHT3 operates at 16 V rated voltage. Substitute parts must maintain equal or higher voltage ratings to ensure safe operation within the original circuit design parameters.

Performance Parameters: ESR, operating temperature range, and lifetime specifications must be evaluated against circuit requirements. Substitutes with different ESR values or temperature ratings may be acceptable depending on application-specific constraints.

The identified substitute T491B685M006AT from KEMET matches the mandatory parameters but operates at a lower voltage rating (6.3 V), which restricts its use to circuits designed for lower voltage operation.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (16 V Applications): The F971C685MBAHT3 is obsolete. Direct replacement requires a 6.8 µF, ±20% tolerance tantalum capacitor rated at 16 V or higher in the 1411 package. The T491B685M006AT does not meet this requirement due to its 6.3 V rating and should not be used in circuits designed for 16 V operation.

For Lower Voltage Applications (6.3 V or Below): The T491B685M006AT (KEMET) is an active product suitable for applications operating at 6.3 V or lower. This substitute provides ROHS3 compliance and improved moisture sensitivity characteristics (MSL 1 vs. MSL 3). The higher ESR (4.6 Ohm vs. 2.5 Ohm) and lower maximum operating temperature (125°C vs. 135°C) must be evaluated against circuit specifications.

Compliance Considerations: Both parts are ROHS3 compliant. The T491B685M006AT offers REACH Unaffected status, providing additional regulatory clarity for certain applications.

Frequently Asked Questions (FAQ)

Q: Can T491B685M006AT replace F971C685MBAHT3 in a 16 V circuit? A: No. The T491B685M006AT is rated at 6.3 V maximum, which is insufficient for circuits designed for 16 V operation. Using an undersized voltage rating creates reliability and safety risks.

Q: What makes these parts substitutable? A: Both parts share identical capacitance (6.8 µF), tolerance (±20%), and package dimensions (1411 / 3528 Metric). Substitution is limited by voltage rating compatibility and application-specific performance requirements.

Q: Does the higher ESR of T491B685M006AT affect compatibility? A: ESR differences (2.5 Ohm vs. 4.6 Ohm) may impact circuit performance in applications sensitive to impedance characteristics. Circuit analysis is required to determine acceptability.

Q: What is the significance of MSL rating differences? A: The F971C685MBAHT3 has MSL 3 (168 hours), requiring controlled storage and handling. The T491B685M006AT has MSL 1 (unlimited), offering greater flexibility in storage and manufacturing environments.

Q: Are there voltage-rated alternatives to F971C685MBAHT3? A: The provided substitute list contains only T491B685M006AT. Additional 16 V rated alternatives in the 6.8 µF, 1411 package category may exist from other manufacturers and should be evaluated through component distribution channels.

Q: How do operating temperature ranges affect selection? A: The F971C685MBAHT3 operates to 135°C; T491B685M006AT to 125°C. Applications requiring operation above 125°C require alternatives rated to 135°C or higher.