F971D684MAA Equivalent & Substitute Parts

Part Overview

The F971D684MAA is a 0.68 µF molded tantalum capacitor manufactured by KYOCERA AVX, rated for 20 V operation in a 1206 (3216 Metric) surface mount package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part features automotive-grade reliability with AEC-Q200 certification and ROHS3 compliance, suitable for applications requiring stable capacitance performance across the -55°C to 125°C operating temperature range.

Substiute Parts

F971D684MAA

KYOCERA AVXIn Stock: 1249F971D684MAA Datasheet

Current PartRFQ

T491A684M020AT

KEMETIn Stock: 2782T491A684M020AT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the F971D684MAA is determined by strict equivalence across the following critical parameters:

• Capacitance value: 0.68 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage rating: 20 V (exact match required)
• Package / Case: 1206 (3216 Metric) (exact match required)
• Mounting type: Surface Mount (exact match required)
• Operating temperature range: -55°C to 125°C (exact match required)
• Component type: Molded tantalum (exact match required)

The T491A684M020AT from KEMET meets all substitution criteria. Both parts share identical electrical specifications, package dimensions, and thermal operating parameters. Differences in ESR (7.6 Ohm vs. 12 Ohm) and MSL rating do not preclude substitution when the application circuit design accommodates the specified ESR range.

Parameter Comparison

Engineering Selection Recommendations

The T491A684M020AT is a direct functional equivalent for the F971D684MAA. Both components satisfy identical electrical and mechanical requirements for 0.68 µF, 20 V, 1206 package tantalum capacitor applications. The KEMET part carries active product status, ensuring continued availability and manufacturing support, whereas the KYOCERA AVX part is obsolete.

Both parts maintain ROHS3 compliance and operate across the full -55°C to 125°C temperature range. The T491A684M020AT features a higher MSL rating (1 vs. 3), indicating superior moisture resistance characteristics. The height difference (0.071" vs. 0.047") must be evaluated against PCB layout constraints and clearance requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can the T491A684M020AT replace the F971D684MAA in existing designs?

A: Yes. Both parts share identical capacitance (0.68 µF), tolerance (±20%), voltage rating (20 V), package (1206), and operating temperature range (-55°C to 125°C). The primary design consideration is the seated height difference: 0.071" (KEMET) versus 0.047" (KYOCERA AVX). Verify PCB clearance and component placement constraints before implementation.

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

A: The F971D684MAA specifies 7.6 Ohm ESR, while the T491A684M020AT specifies 12 Ohm ESR. ESR affects ripple current handling and thermal performance. Applications with strict ESR requirements must evaluate circuit performance at the higher ESR value. For general-purpose applications, both values fall within acceptable tantalum capacitor performance ranges.

Q: Are there compliance or certification differences?

A: Both parts are ROHS3 compliant and REACH unaffected. The F971D684MAA carries AEC-Q200 automotive qualification. The T491A684M020AT is classified as general purpose. Applications requiring automotive-grade certification should confirm whether AEC-Q200 qualification is mandatory for the end application.

Q: What does the MSL rating difference mean?

A: The F971D684MAA has MSL 3 (168 hours), while the T491A684M020AT has MSL 1 (unlimited). MSL indicates moisture sensitivity during storage and handling. The KEMET part requires less stringent moisture control during manufacturing and assembly processes.

Q: Are the physical dimensions compatible with the same PCB footprint?

A: The lateral dimensions (0.126" L x 0.063" W) are identical, ensuring footprint compatibility. The height difference (0.071" vs. 0.047") may affect clearance in space-constrained applications. Confirm adequate vertical clearance before substitution.