F971C685MBA Equivalent & Substitute Parts

Part Overview

The F971C685MBA is a 6.8 µF molded tantalum capacitor manufactured by KYOCERA AVX, rated for 16 V operation in a 1411 (3528 Metric) surface mount package. This component is designed for applications requiring compact, high-reliability capacitive storage with automotive-grade performance. The part is currently in active production status with 703 units available in inventory.

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across manufacturers, ensuring functional interchangeability in circuit applications without design modification.

Key Parameters

Parameter	Value	Specification
Capacitance	6.8 µF	Core electrical rating
Voltage Rating	16 V	Maximum operating voltage
Tolerance	±20%	Capacitance tolerance band
Type	Molded Tantalum	Component construction
ESR	2.5 Ohm	Equivalent series resistance
Package	1411 (3528 Metric)	Physical form factor
Mounting Type	Surface Mount	PCB assembly method
Operating Temperature	-55°C to 125°C	Functional temperature range
RoHS Status	ROHS3 Compliant	Environmental compliance

Substitute Part Grouping Explanation

Substitution eligibility for the F971C685MBA is determined by strict equivalence across the following parameters:

Electrical Parameters: Capacitance value (6.8 µF), voltage rating (16 V), tolerance (±20%), and ESR (2.5 Ohm) must be identical
Physical Parameters: Package designation (1411/3528 Metric) and surface mount mounting type must match
Environmental Parameters: Operating temperature range (-55°C to 125°C) must be supported
Compliance Parameters: RoHS3 compliance and REACH unaffected status must be maintained

The substitute part T491B685M016AT from KEMET meets all these criteria, providing functional equivalence for direct replacement in circuit designs.

Parameter Comparison

Parameter	F971C685MBA (KYOCERA AVX)	T491B685M016AT (KEMET)	Match Status
Capacitance	6.8 µF	6.8 µF	Equivalent
Voltage Rating	16 V	16 V	Equivalent
Tolerance	±20%	±20%	Equivalent
Type	Molded Tantalum	Molded Tantalum	Equivalent
ESR	2.5 Ohm	2.5 Ohm	Equivalent
Package / Case	1411 (3528 Metric)	1411 (3528 Metric)	Equivalent
Size / Dimension	0.138" L x 0.110" W (4.60mm x 2.80mm)	0.138" L x 0.110" W (4.60mm x 2.80mm)	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Operating Temperature	-55°C to 125°C	-55°C to 125°C	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
Height - Seated (Max)	0.091" (2.30mm)	0.083" (2.10mm)	KEMET variant lower
Moisture Sensitivity Level	3 (168 Hours)	1 (Unlimited)	KEMET variant superior

Engineering Selection Recommendations

Both the F971C685MBA and T491B685M016AT are active production components with full RoHS3 compliance and REACH unaffected status, qualifying them for equivalent circuit applications. Selection between these parts should be based on:

Inventory Availability: F971C685MBA has 703 units in stock; T491B685M016AT has 4962 units available
Physical Constraints: T491B685M016AT offers a lower seated height (2.10mm vs. 2.30mm), beneficial for space-constrained PCB layouts
Moisture Handling: T491B685M016AT provides superior moisture sensitivity rating (MSL 1 vs. MSL 3), reducing moisture-related failure risk in humid storage or assembly environments
Supplier Continuity: Both manufacturers maintain active production status, supporting long-term supply chain stability

Frequently Asked Questions (FAQ)

Q: Can T491B685M016AT replace F971C685MBA in existing designs without PCB modification?

A: Yes. Both parts share identical electrical parameters (6.8 µF, 16 V, ±20%, 2.5 Ohm ESR), package designation (1411/3528 Metric), and mounting type (surface mount). The T491B685M016AT has a lower seated height (2.10mm vs. 2.30mm), which is mechanically compatible with existing PCB footprints designed for the F971C685MBA.

Q: What is the significance of the different Moisture Sensitivity Levels?

A: F971C685MBA carries MSL 3 (168 hours), requiring controlled storage and handling within 168 hours of package opening. T491B685M016AT carries MSL 1 (unlimited), eliminating moisture-related shelf-life constraints. For applications with extended storage or humid environments, T491B685M016AT provides operational advantages.

Q: Are both parts suitable for automotive applications?

A: F971C685MBA is rated for automotive use with AEC-Q200 certification. T491B685M016AT is designated for general purpose applications. Both meet RoHS3 compliance and operate across the -55°C to 125°C temperature range required for automotive environments.

Q: What is the difference between the F97 and T491 series designations?

A: F97 and T491 are manufacturer-specific series codes from KYOCERA AVX and KEMET respectively. They do not affect electrical or mechanical equivalence; they identify the product line within each manufacturer's portfolio.

Q: Can these parts be used interchangeably in high-reliability applications?

A: Both parts are active production components with full compliance certifications. Interchangeability is determined by circuit requirements. Verify that the specific application's reliability standards and environmental conditions are met by the selected part's certifications and ratings.

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