F970J685MBAHT3 Equivalent & Substitute Parts

Part Overview

The F970J685MBAHT3 is a 6.8 µF molded tantalum capacitor rated at 6.3 V in a 1411 (3528 Metric) surface mount package, manufactured by KYOCERA AVX. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part is designed for applications requiring compact, high-reliability capacitive storage in automotive and demanding environments.

Substiute Parts

F970J685MBAHT3

KYOCERA AVXIn Stock: 1154F970J685MBAHT3 Datasheet

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T491B685M006AT

KEMETIn Stock: 2977T491B685M006AT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the F970J685MBAHT3 is determined by strict equivalence across the following parameters:

• Capacitance Value: 6.8 µF (exact match required)
• Tolerance: ±20% (matching tolerance band)
• Voltage Rating: 6.3 V (minimum rated voltage must equal or exceed application requirement)
• Package / Case: 1411 (3528 Metric) (identical physical footprint and mounting interface)
• Mounting Type: Surface Mount (same assembly method)
• Type: Molded Tantalum (same dielectric technology)

The substitute part T491B685M006AT meets all these criteria. Variations in ESR, operating temperature maximum, and lifetime specifications do not disqualify substitution when the core electrical and mechanical parameters align.

Parameter Comparison

Engineering Selection Recommendations

The T491B685M006AT (KEMET) is a direct functional substitute for the F970J685MBAHT3. Both components are ROHS3 compliant and share identical electrical ratings (6.8 µF, ±20%, 6.3 V) and mechanical specifications (1411 package, surface mount). The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

The T491B685M006AT exhibits a higher ESR (4.6 Ohm versus 2.5 Ohm) and a lower maximum operating temperature (125°C versus 135°C). These differences are secondary to the core substitution criteria and do not affect compatibility in applications designed for the original part's specifications.

Frequently Asked Questions (FAQ)

Q: Can T491B685M006AT be used as a direct replacement for F970J685MBAHT3 on existing PCBs?

A: Yes. Both parts share identical package dimensions (1411 / 3528 Metric), footprint, and mounting interface. No PCB redesign is required.

Q: What is the significance of the ESR difference (2.5 Ohm vs. 4.6 Ohm)?

A: ESR affects ripple current handling and heat dissipation. The T491B685M006AT's higher ESR may result in slightly increased power loss in high-frequency switching applications. Verify that the application's ripple current specification does not exceed the substitute part's rating.

Q: Why does the substitute part have a lower maximum operating temperature (125°C vs. 135°C)?

A: This reflects different design specifications between manufacturers. For applications operating at or below 125°C, this difference is not a limiting factor. Applications requiring sustained operation above 125°C should retain the original part or identify alternatives with higher temperature ratings.

Q: Are both parts suitable for automotive applications?

A: The F970J685MBAHT3 carries AEC-Q200 automotive qualification. The T491B685M006AT is classified as general purpose. Automotive applications requiring AEC-Q200 certification should confirm the substitute part's suitability with the system integrator or design authority.

Q: What is the difference in Moisture Sensitivity Level (MSL)?

A: The F970J685MBAHT3 has MSL 3 (168 hours); the T491B685M006AT has MSL 1 (unlimited). MSL 1 indicates superior moisture resistance and less stringent storage and handling requirements, making the substitute part more robust in humid environments.