F971V155MBA Equivalent & Substitute Parts

Part Overview

The F971V155MBA is a 1.5 µF molded tantalum capacitor manufactured by KYOCERA AVX, rated for 35 V operation. This surface mount component is designed for automotive and high-reliability applications, featuring AEC-Q200 qualification and ROHS3 compliance. The part is currently in active production status with 708 units available in inventory.

Substitute parts become necessary when the primary manufacturer's stock is unavailable, lead times are extended, or design flexibility is required across qualified alternative sources while maintaining electrical and mechanical compatibility.

Substiute Parts

F971V155MBA

KYOCERA AVXIn Stock: 768F971V155MBA Datasheet

Current PartRFQ

T491B155M035AT

KEMETIn Stock: 2836T491B155M035AT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the F971V155MBA is determined by strict alignment of the following parameters:

• Capacitance value: 1.5 µF (exact match required)
• Voltage rating: 35 V (exact match required)
• Tolerance: ±20% (exact match required)
• Package / Case: 1411 (3528 Metric) (exact match required)
• Type: Molded Tantalum (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)

The substitute part T491B155M035AT from KEMET meets all mandatory substitution criteria. Variations in ESR (Equivalent Series Resistance), MSL (Moisture Sensitivity Level), and seated height are within acceptable engineering tolerances for this component category and do not preclude functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

The T491B155M035AT qualifies as a direct substitute for the F971V155MBA based on the following engineering criteria:

All critical electrical parameters—capacitance, voltage rating, tolerance, and operating temperature range—are identical between the two parts. Both components are ROHS3 compliant and manufactured to surface mount specifications using the identical 1411 (3528 Metric) package.

The F971V155MBA carries AEC-Q200 automotive qualification, while the T491B155M035AT is designated for general purpose applications. For applications requiring automotive-grade reliability certification, the AEC-Q200 status of the F971V155MBA should be verified as a mandatory requirement before substitution.

The T491B155M035AT exhibits a lower Moisture Sensitivity Level (MSL 1 vs. MSL 3), which represents an improvement in handling and storage characteristics. The 1 Ohm increase in ESR (from 4 Ohm to 5 Ohm) remains within acceptable performance margins for standard tantalum capacitor applications.

Frequently Asked Questions (FAQ)

Q: Can T491B155M035AT be used as a direct replacement for F971V155MBA in all applications?

A: The T491B155M035AT meets all core electrical and mechanical substitution criteria. However, if your application requires AEC-Q200 automotive qualification, verify that this certification is not a mandatory design requirement before proceeding with substitution.

Q: What is the significance of the different ESR values (4 Ohm vs. 5 Ohm)?

A: ESR (Equivalent Series Resistance) affects ripple current handling and thermal performance. The 1 Ohm difference between these parts is within normal manufacturing variation for molded tantalum capacitors and does not impact functional compatibility in standard applications.

Q: Why does the T491B155M035AT have a lower Moisture Sensitivity Level?

A: MSL 1 (Unlimited) indicates superior moisture resistance compared to MSL 3 (168 Hours). This is a material and manufacturing advantage that simplifies handling and storage procedures without affecting electrical performance.

Q: Are the physical dimensions compatible for PCB assembly?

A: Yes. Both parts use the identical 1411 (3528 Metric) package with matching footprint dimensions of 0.138" L x 0.110" W (4.60mm x 2.80mm). The seated height difference (0.091" vs. 0.083") is within standard PCB assembly tolerances and does not require design modification.

Q: What packaging format is available for both parts?

A: Both the F971V155MBA and T491B155M035AT are supplied in Tape & Reel (TR) format, suitable for automated surface mount assembly processes.