F931A686MBA Equivalent & Substitute Parts

Part Overview

The F931A686MBA is a 68 µF molded tantalum capacitor manufactured by KYOCERA AVX, rated for 10 V operation in a 1411 (3528 Metric) surface mount package. This component is classified as Active product status and is designed for general purpose applications requiring stable capacitance and low equivalent series resistance in compact form factors. Substitute parts are identified to address supply chain continuity, inventory availability, and application-specific performance requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

F931A686MBA

KYOCERA AVXIn Stock: 1451F931A686MBA Datasheet

Current PartRFQ

T491B686M010AT

KEMETIn Stock: 67294T491B686M010AT Datasheet

DirectRFQ

TMCMB1A686MTRF

Vishay SpragueIn Stock: 819TMCMB1A686MTRF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the F931A686MBA are qualified based on the following electrical and mechanical parameters:

• Capacitance value: 68 µF (exact match required)
• Tolerance: ±20% (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)
• Type: Molded Tantalum (exact match required)
• RoHS compliance: ROHS3 Compliant (exact match required)
• MSL rating: 1 (Unlimited) (exact match required)

Equivalent Series Resistance (ESR) values may vary within acceptable ranges for general purpose applications. Physical dimensions (length, width, height) remain consistent across qualified substitutes within the 1411 package specification. All substitute parts maintain Active product status and are suitable for direct replacement in applications where the F931A686MBA is specified.

Parameter Comparison

Engineering Selection Recommendations

All three parts—F931A686MBA (KYOCERA AVX), T491B686M010AT (KEMET), and TMCMB1A686MTRF (Vishay Sprague)—meet the core electrical and mechanical requirements for 68 µF, 10 V, 1411 package molded tantalum capacitors. All are ROHS3 compliant, REACH unaffected, and rated for -55°C to 125°C operation with MSL 1 (Unlimited) moisture sensitivity.

T491B686M010AT (KEMET) and TMCMB1A686MTRF (Vishay Sprague) both feature reduced seated height (0.083" vs. 0.091"), which may provide advantages in space-constrained applications. ESR values differ slightly across the three parts (900 mOhm, 1 Ohm, and 1.1 Ohm respectively), with the F931A686MBA offering the lowest ESR specification.

Selection between these parts should be based on availability, packaging format preference (Tape & Reel vs. Cut Tape), and specific application ESR requirements. All three maintain Active product status and are suitable for direct substitution in general purpose applications.

Frequently Asked Questions (FAQ)

Q: Can T491B686M010AT replace F931A686MBA in all applications?

A: Yes, provided the application does not have specific ESR constraints below 1 Ohm. Both parts share identical capacitance (68 µF), voltage rating (10 V), package (1411), temperature range (-55°C to 125°C), and compliance certifications (ROHS3, REACH Unaffected, MSL 1).

Q: What is the significance of the height difference between F931A686MBA (0.091") and the KEMET/Vishay alternatives (0.083")?

A: The 0.008" (0.20mm) height reduction in T491B686M010AT and TMCMB1A686MTRF may be relevant for applications with strict PCB assembly height constraints or where component stacking is a consideration. All three parts conform to the 1411 package specification.

Q: Are there packaging format differences between the substitute parts?

A: Yes. F931A686MBA and T491B686M010AT are supplied in Tape & Reel (TR) format, while TMCMB1A686MTRF is supplied in Cut Tape (CT) format. Selection depends on assembly line requirements and volume considerations.

Q: Do all substitute parts have the same lifetime rating?

A: F931A686MBA and T491B686M010AT both specify 2000 Hrs @ 125°C. TMCMB1A686MTRF does not provide a lifetime specification in the available data.

Q: What ESR value should I select for my application?

A: ESR selection depends on application-specific ripple current and frequency response requirements. F931A686MBA offers 900 mOhm @ 100kHz, T491B686M010AT offers 1 Ohm, and TMCMB1A686MTRF offers 1.1 Ohm @ 100kHz. Lower ESR values reduce heat generation and improve transient response in high-frequency switching applications.