F971D475MBA Equivalent & Substitute Parts

Part Overview

The F971D475MBA is a 4.7 µF molded tantalum capacitor manufactured by KYOCERA AVX, rated for 20 V operation in a 1411 (3528 Metric) surface mount package. This component is designed for automotive and high-reliability applications with AEC-Q200 qualification. The part is currently active in production with 801 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, design redundancy, and supply chain continuity.

Key Parameters

Parameter	Value
Capacitance	4.7 µF
Voltage Rating	20 V
Tolerance	±20%
Package / Case	1411 (3528 Metric)
Mounting Type	Surface Mount
Type	Molded Tantalum
ESR	2.8 Ohm
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant
AEC-Q200 Rating	Yes

Substitute Part Grouping Explanation

Substitute parts for the F971D475MBA are identified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Capacitance Value: Must be 4.7 µF (no tolerance variation)
Voltage Rating: Must be 20 V or higher
Package / Case: Must be 1411 (3528 Metric) for PCB compatibility
Mounting Type: Must be Surface Mount
Type: Must be Molded Tantalum
Operating Temperature Range: Must support -55°C to 125°C minimum
RoHS Compliance: Must be ROHS3 Compliant

Substitutes are grouped into two categories:

Parametric Equivalent (Same Manufacturer Series): F971D475KBA differs only in tolerance (±10% vs. ±20%), maintaining identical electrical performance and automotive qualification.

Direct Manufacturer Equivalent (Cross-Manufacturer): T491B475M020AT from KEMET meets all core electrical and mechanical parameters with identical capacitance, voltage, tolerance, and package specifications.

Parameter Comparison

Parameter	F971D475MBA (Main)	F971D475KBA (Parametric Equivalent)	T491B475M020AT (Direct Equivalent)
Manufacturer	KYOCERA AVX	KYOCERA AVX	KEMET
Capacitance	4.7 µF	4.7 µF	4.7 µF
Tolerance	±20%	±10%	±20%
Voltage Rating	20 V	20 V	20 V
Package / Case	1411 (3528 Metric)	1411 (3528 Metric)	1411 (3528 Metric)
Size (L x W)	0.138" x 0.110" (4.60mm x 2.80mm)	0.138" x 0.110" (4.60mm x 2.80mm)	0.138" x 0.110" (4.60mm x 2.80mm)
Height - Seated (Max)	0.091" (2.30mm)	0.091" (2.30mm)	0.083" (2.10mm)
ESR	2.8 Ohm	2.8 Ohm	3 Ohm
Operating Temperature	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Type	Molded Tantalum	Molded Tantalum	Molded Tantalum
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

F971D475KBA (KYOCERA AVX): This parametric equivalent offers tighter tolerance (±10%) compared to the main part (±20%), providing improved capacitance accuracy within the same manufacturer series. Both parts maintain AEC-Q200 automotive qualification and ROHS3 compliance. Selection is appropriate when tighter tolerance specifications are required without changing manufacturers or supply chain.

T491B475M020AT (KEMET): This direct manufacturer equivalent maintains identical electrical specifications (4.7 µF, ±20%, 20 V) and package dimensions. The part is ROHS3 compliant and suitable for general-purpose applications. The seated height is 0.083" (2.10mm) compared to 0.091" (2.30mm) for the KYOCERA AVX parts, and ESR is 3 Ohm versus 2.8 Ohm. Selection is appropriate for cross-manufacturer substitution when KYOCERA AVX parts are unavailable, provided the lower profile and slightly higher ESR are acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can F971D475KBA be used as a direct replacement for F971D475MBA?

A: Yes. Both parts are 4.7 µF, 20 V molded tantalum capacitors in the 1411 (3528 Metric) package with identical physical dimensions and operating temperature range. The F971D475KBA has tighter tolerance (±10% vs. ±20%), making it a compatible upgrade within the same manufacturer series.

Q: What are the key differences between KYOCERA AVX and KEMET substitutes?

A: The KEMET T491B475M020AT maintains identical capacitance, voltage, and tolerance specifications. Physical differences include a lower seated height (0.083" vs. 0.091") and slightly higher ESR (3 Ohm vs. 2.8 Ohm). Both are ROHS3 compliant and rated for -55°C to 125°C operation.

Q: Are all substitute parts automotive-qualified?

A: The KYOCERA AVX parts (F971D475MBA and F971D475KBA) carry AEC-Q200 automotive qualification. The KEMET T491B475M020AT is rated for general-purpose applications and does not carry AEC-Q200 designation. For automotive applications requiring AEC-Q200 compliance, use KYOCERA AVX parts only.

Q: Will the lower profile of T491B475M020AT affect PCB assembly?

A: The T491B475M020AT has a maximum seated height of 0.083" (2.10mm) compared to 0.091" (2.30mm) for KYOCERA AVX parts. This lower profile is compatible with standard surface mount assembly processes and will not cause clearance issues in most designs. Verify PCB layout constraints if height is critical.

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

A: F971D475MBA and F971D475KBA are both AEC-Q200 qualified and suitable for automotive and high-reliability applications. T491B475M020AT is general-purpose rated and should be evaluated against specific high-reliability requirements before substitution.

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