F971V685MNC Equivalent & Substitute Parts

Part Overview

The F971V685MNC is a 6.8 µF molded tantalum capacitor manufactured by KYOCERA AVX, rated for 35 V operation. This component is designed for surface mount applications in the 2917 (7343 Metric) package format. The part is currently active in production with AEC-Q200 automotive qualification and high reliability ratings. Substitute parts are identified to provide design flexibility, inventory alternatives, and supply chain continuity while maintaining electrical and mechanical compatibility.

Substiute Parts

F971V685MNC

KYOCERA AVXIn Stock: 999F971V685MNC Datasheet

Current PartRFQ

T491D685M035AT

KEMETIn Stock: 1830T491D685M035AT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the F971V685MNC is determined by the following critical parameters:

• Capacitance Value: 6.8 µF (exact match required)
• Voltage Rating: 35 V (minimum requirement; higher ratings acceptable)
• Tolerance: ±20% (electrical tolerance specification)
• Package / Case: 2917 (7343 Metric) (physical and footprint compatibility)
• Mounting Type: Surface Mount (assembly process compatibility)
• Operating Temperature Range: -55°C ~ 125°C (thermal operating envelope)
• RoHS Compliance: ROHS3 Compliant (regulatory requirement)

The substitute part T491D685M035AT meets all critical substitution criteria. Variations in ESR (Equivalent Series Resistance), MSL (Moisture Sensitivity Level), and manufacturer-specific features do not preclude substitution when the above parameters align.

Parameter Comparison

Engineering Selection Recommendations

Both the F971V685MNC and T491D685M035AT are active production components with ROHS3 compliance. The F971V685MNC carries AEC-Q200 automotive qualification and high reliability designation, making it the primary choice for automotive and mission-critical applications. The T491D685M035AT is suitable for general purpose applications where automotive qualification is not required.

The height difference of 0.004" (0.10mm) between the two parts is within typical PCB assembly tolerances and does not present a constraint for standard surface mount processes. The ESR difference of 0.3 Ohm between parts should be evaluated in applications where impedance characteristics are critical to circuit performance.

Frequently Asked Questions (FAQ)

Q: Can T491D685M035AT be used as a direct replacement for F971V685MNC?

A: Yes, the T491D685M035AT meets all critical electrical and mechanical substitution parameters: identical capacitance (6.8 µF), voltage rating (35 V), tolerance (±20%), package (2917), and operating temperature range (-55°C ~ 125°C). Both parts are ROHS3 compliant and surface mount compatible.

Q: What is the significance of the ESR difference between these parts?

A: The F971V685MNC has an ESR of 1 Ohm while the T491D685M035AT has an ESR of 1.3 Ohm. This 0.3 Ohm difference may be relevant in high-frequency filtering or low-impedance applications. For general purpose filtering and decoupling, this variation is typically acceptable.

Q: Are there height clearance concerns when substituting these parts?

A: The F971V685MNC has a maximum seated height of 0.118" (3.00mm) and the T491D685M035AT has a maximum seated height of 0.122" (3.10mm). The 0.004" (0.10mm) difference is negligible for standard PCB assembly and does not present clearance issues in typical designs.

Q: Does the MSL (Moisture Sensitivity Level) difference affect substitution?

A: The F971V685MNC has MSL 3 (168 Hours) while the T491D685M035AT has MSL 1 (Unlimited). MSL ratings define moisture exposure limits during storage and handling. The lower MSL of the substitute part provides more relaxed storage requirements and does not prevent substitution.

Q: Which part should be selected for automotive applications?

A: The F971V685MNC is qualified to AEC-Q200 and carries high reliability designation, making it the specified choice for automotive applications. The T491D685M035AT is classified as general purpose and should be used only in non-automotive contexts unless additional qualification documentation is obtained.