Equivalent & Substitute Parts for T491D476K010AS

Part Overview

The T491D476K010AS is a 47 µF molded tantalum capacitor manufactured by KEMET, rated at 10 V with ±10% tolerance in a 2917 (7343 Metric) surface mount package. This component operates across a temperature range of -55°C to 125°C with an equivalent series resistance (ESR) of 800 mOhm and is classified as general purpose.

The T491D476K010AS carries an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Active alternatives with identical or upgraded electrical characteristics are available from KEMET and other manufacturers.

Key Parameters

Parameter	Value	Significance for Substitution
Capacitance	47 µF	Must match exactly for direct substitution
Voltage Rating	10 V	Minimum requirement; higher ratings acceptable as upgrades
Tolerance	±10%	Must match or be tighter for functional equivalence
ESR (Equivalent Series Resistance)	800 mOhm	Determines ripple current performance; lower values indicate improved performance
Package / Case	2917 (7343 Metric)	Must match for mechanical and electrical compatibility
Operating Temperature Range	-55°C to 125°C	Minimum requirement; extended ranges acceptable
Type	Molded Tantalum	Defines construction and reliability characteristics
Mounting Type	Surface Mount	Must match for PCB assembly compatibility
RoHS Status	ROHS3 Compliant	Regulatory requirement for many applications

Substitute Part Grouping Explanation

Substitute parts for the T491D476K010AS are categorized based on the following substitution logic:

Direct Equivalents (Same Electrical Specifications, Active Status) Direct equivalents maintain identical capacitance (47 µF), voltage rating (10 V), tolerance (±10%), ESR (800 mOhm), and package (2917). These parts differ only in product status (active vs. obsolete) and packaging format (tape & reel vs. cut tape). Direct equivalents are the primary choice for one-to-one replacement.

Voltage Upgrades (Higher Rated Voltage, Same Capacitance) Voltage upgrade substitutes maintain 47 µF capacitance and ±10% tolerance but increase the rated voltage from 10 V to 16 V. These parts are electrically compatible in applications where the original 10 V rating is sufficient, as higher-rated capacitors operate safely at lower voltages. Voltage upgrades provide additional design margin and reliability.

Performance Upgrades (Extended Temperature Range, Automotive Grade) Performance upgrades maintain core electrical specifications (47 µF, 10 V or 16 V, ±10%) but extend the operating temperature range to -55°C to 175°C and include automotive-grade certifications (AEC-Q200). These parts are suitable for applications requiring enhanced thermal performance or automotive compliance.

ESR Variants (Lower Equivalent Series Resistance) ESR variants maintain 47 µF capacitance and 10 V rating but reduce ESR from 800 mOhm to 200–220 mOhm. Lower ESR improves ripple current handling and reduces heat generation. These parts are compatible where improved high-frequency performance is beneficial.

Cross-Manufacturer Equivalents (Different Manufacturer, Identical Specifications) Cross-manufacturer equivalents from KYOCERA AVX and Vishay Sprague maintain the same electrical and mechanical specifications as the T491D476K010AS. These parts provide supply chain flexibility and alternative sourcing options.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	ESR	Package	Temp. Range	Product Status	RoHS Status
T491D476K010AS	KEMET	47 µF	10 V	±10%	800 mOhm	2917	-55°C to 125°C	Obsolete	ROHS3
T491D476K010AT	KEMET	47 µF	10 V	±10%	800 mOhm	2917	-55°C to 125°C	Active	ROHS3
T491D476K016AH	KEMET	47 µF	16 V	±10%	800 mOhm	2917	-55°C to 125°C	Active	RoHS non-compliant
T491D476K016AT	KEMET	47 µF	16 V	±10%	800 mOhm	2917	-55°C to 125°C	Active	ROHS3
T499D476K010ATE800	KEMET	47 µF	10 V	±10%	800 mOhm	2917	-55°C to 175°C	Active	ROHS3
T499D476K016ATE800	KEMET	47 µF	16 V	±10%	800 mOhm	2917	-55°C to 175°C	Active	ROHS3
T494D476K010AT	KEMET	47 µF	10 V	±10%	220 mOhm	2917	-55°C to 125°C	Active	ROHS3
T495D476K010ATE200	KEMET	47 µF	10 V	±10%	200 mOhm	2917	-55°C to 125°C	Active	ROHS3
TAJD476K016H	KYOCERA AVX	47 µF	16 V	±10%	800 mOhm	2917	-55°C to 125°C	Active	RoHS non-compliant
TAJD476K016RNJ	KYOCERA AVX	47 µF	16 V	±10%	800 mOhm	2917	-55°C to 125°C	Active	ROHS3
293D476X9010D2TE3	Vishay Sprague	47 µF	10 V	±10%	700 mOhm	2917	-55°C to 125°C	Active	ROHS3

Engineering Selection Recommendations

Primary Recommendation: T491D476K010AT

The T491D476K010AT is the direct equivalent replacement for the obsolete T491D476K010AS. Both parts share identical electrical specifications: 47 µF capacitance, 10 V voltage rating, ±10% tolerance, and 800 mOhm ESR. The T491D476K010AT maintains active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. This part is suitable for direct substitution without circuit redesign.

Secondary Recommendation for RoHS3 Compliance: T491D476K016AT

For applications requiring ROHS3 compliance with voltage margin, the T491D476K016AT provides a 16 V rated upgrade while maintaining all other specifications. This part is active and widely available. The higher voltage rating provides additional design margin without affecting circuit performance in 10 V applications.

Recommendation for Extended Temperature Applications: T499D476K010ATE800

The T499D476K010ATE800 extends the operating temperature range to -55°C to 175°C and includes AEC-Q200 automotive certification. This part maintains 47 µF capacitance, 10 V rating, and 800 mOhm ESR. Selection is appropriate for automotive or high-temperature industrial applications.

Recommendation for Improved ESR Performance: T494D476K010AT or T495D476K010ATE200

The T494D476K010AT reduces ESR to 220 mOhm, while the T495D476K010ATE200 reduces ESR to 200 mOhm. Both maintain 47 µF capacitance and 10 V rating. These parts are suitable for applications requiring lower ripple current handling or reduced thermal dissipation.

Cross-Manufacturer Option: TAJD476K016RNJ

The TAJD476K016RNJ from KYOCERA AVX provides a 16 V rated alternative with ROHS3 compliance and high inventory availability (55,400 units). This part is suitable for supply chain diversification and long-term sourcing security.

Frequently Asked Questions (FAQ)

Q: Can I use T491D476K016AT as a direct replacement for T491D476K010AS?

A: Yes. The T491D476K016AT is electrically compatible. Both parts maintain 47 µF capacitance, ±10% tolerance, 800 mOhm ESR, and the 2917 package. The higher 16 V rating operates safely in 10 V applications and provides additional design margin. The T491D476K016AT is active and ROHS3 compliant.

Q: What is the difference between T491D476K010AT and T499D476K010ATE800?

A: Both parts maintain 47 µF, 10 V, and 800 mOhm ESR specifications. The primary difference is operating temperature range: T491D476K010AT operates -55°C to 125°C, while T499D476K010ATE800 extends to -55°C to 175°C. The T499 series includes AEC-Q200 automotive certification. Select T499D476K010ATE800 for high-temperature or automotive applications.

Q: Can I substitute a lower ESR part like T494D476K010AT for the original T491D476K010AS?

A: Yes. The T494D476K010AT maintains 47 µF capacitance and 10 V rating but reduces ESR from 800 mOhm to 220 mOhm. Lower ESR improves ripple current performance and reduces heat generation. This substitution is compatible and provides performance enhancement.

Q: Are KYOCERA AVX TAJ series parts compatible with KEMET T491 parts?

A: Yes, for equivalent specifications. The TAJD476K016RNJ maintains 47 µF, 16 V, ±10% tolerance, 800 mOhm ESR, and 2917 package. Cross-manufacturer substitution is valid when electrical and mechanical parameters match. TAJD476K016RNJ is ROHS3 compliant and offers high inventory availability.

Q: What does RoHS non-compliant mean for T491D476K016AH?

A: RoHS non-compliant indicates the part does not meet ROHS3 (Restriction of Hazardous Substances) standards. If your application or region requires RoHS3 compliance, select ROHS3-compliant alternatives such as T491D476K016AT or TAJD476K016RNJ instead.

Q: Can I use Vishay Sprague 293D476X9010D2TE3 as a substitute?

A: Yes. The 293D476X9010D2TE3 maintains 47 µF, 10 V, ±10% tolerance, and 2917 package. ESR is 700 mOhm (slightly lower than the original 800 mOhm), which improves performance. This part is ROHS3 compliant and active, providing cross-manufacturer sourcing flexibility.

Q: What packaging formats are available for these substitutes?

A: Packaging formats include Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and unspecified formats. Tape & Reel is standard for high-volume production. Cut Tape & Digi-Reel® is suitable for lower-volume or mixed-component orders. Verify packaging compatibility with your assembly process requirements.

Q: Is the 2917 (7343 Metric) package size consistent across all substitutes?

A: Yes. All listed substitutes maintain the 2917 (7343 Metric) package specification with dimensions 0.287" L × 0.169" W (7.30 mm × 4.30 mm). Height varies slightly: most parts are 0.122" (3.10 mm), while T499 series parts are 0.110" (2.80 mm). Verify PCB layout clearance if height variation is critical.

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