T491D477M006AS Equivalent & Substitute Parts

Part Overview

The T491D477M006AS is a 470 µF molded tantalum capacitor manufactured by KEMET, rated for 6.3 V with ±20% tolerance and 400 mOhm equivalent series resistance in a 2917 (7343 Metric) surface mount package. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional alternatives with variations in specific parameters such as tolerance, ESR, or series designation.

Key Parameters

Parameter	Value
Capacitance	470 µF
Voltage Rating	6.3 V
Tolerance	±20%
ESR (Equivalent Series Resistance)	400 mOhm
Package / Case	2917 (7343 Metric)
Mounting Type	Surface Mount
Operating Temperature Range	-55°C to 125°C
Type	Molded Tantalum
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the T491D477M006AS is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters (Must Match):

Capacitance: 470 µF
Voltage Rating: 6.3 V
Package / Case: 2917 (7343 Metric)
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 125°C
Type: Molded Tantalum

Allowable Variation Parameters:

Tolerance: ±20% (baseline); ±10% represents an upgrade
ESR: 400 mOhm (baseline); lower values (150 mOhm, 45 mOhm, 30 mOhm) represent performance improvements
Series Designation: T491, T494, T495, T510 (KEMET); TAJ (KYOCERA AVX)
Packaging Format: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®
Product Status: Active status preferred over obsolete

Substitute parts are grouped into three categories: direct equivalents (same electrical specifications, different packaging or status), upgrades (improved tolerance or ESR), and similar alternatives (different series with comparable performance characteristics).

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Voltage	Tolerance	ESR	Product Status	RoHS Status	Packaging
T491D477M006AS	KEMET	T491	470 µF	6.3 V	±20%	400 mOhm	Obsolete	ROHS3 Compliant	-
T491D477M006AT	KEMET	T491	470 µF	6.3 V	±20%	400 mOhm	Active	ROHS3 Compliant	CT & Digi-Reel®
T491D477K006AT	KEMET	T491	470 µF	6.3 V	±10%	400 mOhm	Active	ROHS3 Compliant	CT & Digi-Reel®
T494D477M006AH	KEMET	T494	470 µF	6.3 V	±20%	150 mOhm	Active	RoHS non-compliant	TR
T494D477M006AT	KEMET	T494	470 µF	6.3 V	±20%	150 mOhm	Active	ROHS3 Compliant	TR
T495D477M006ATE045	KEMET	T495	470 µF	6.3 V	±20%	45 mOhm	Active	ROHS3 Compliant	CT & Digi-Reel®
T510X477M006AT	KEMET	T510	470 µF	6.3 V	±20%	30 mOhm	Active	ROHS3 Compliant	TR
T510X477M006ATE030	KEMET	T510	470 µF	6.3 V	±20%	30 mOhm	Active	ROHS3 Compliant	TR
TAJD477K006H	KYOCERA AVX	TAJ	470 µF	6.3 V	±10%	400 mOhm	Active	RoHS non-compliant	-
TAJD477M006RNJ	KYOCERA AVX	TAJ	470 µF	6.3 V	±20%	400 mOhm	Active	ROHS3 Compliant	CT & Digi-Reel®
TAJD477K006RNJ	KYOCERA AVX	TAJ	470 µF	6.3 V	±10%	400 mOhm	Active	ROHS3 Compliant	CT & Digi-Reel®

Engineering Selection Recommendations

Direct Equivalent (Preferred Primary Substitute):

T491D477M006AT (KEMET) is the direct equivalent replacement for the obsolete T491D477M006AS. Both parts maintain identical electrical specifications: 470 µF capacitance, 6.3 V rating, ±20% tolerance, and 400 mOhm ESR. The primary distinction is product status—T491D477M006AT is active and carries ROHS3 compliance certification. This part is available in Cut Tape (CT) & Digi-Reel® packaging format.

Tolerance Upgrade Option:

T491D477K006AT (KEMET) and TAJD477K006RNJ (KYOCERA AVX) both provide ±10% tolerance in place of the baseline ±20%, while maintaining all other electrical parameters. These upgrades are suitable for applications requiring tighter capacitance tolerance specifications. Both are active products with ROHS3 compliance.

ESR Performance Alternatives:

Parts from the T494, T495, and T510 KEMET series offer reduced ESR values (150 mOhm, 45 mOhm, and 30 mOhm respectively) while maintaining the same capacitance, voltage rating, and tolerance. These alternatives are applicable in designs where lower equivalent series resistance improves performance characteristics such as ripple current handling or transient response. All are active products with ROHS3 compliance.

Cross-Manufacturer Alternative:

TAJD477M006RNJ (KYOCERA AVX) provides an equivalent specification from an alternative manufacturer. This part maintains 470 µF capacitance, 6.3 V rating, ±20% tolerance, and 400 mOhm ESR with ROHS3 compliance and active product status.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status. Parts T494D477M006AH and TAJD477K006H are RoHS non-compliant and should be selected only when legacy compliance requirements apply.

Frequently Asked Questions (FAQ)

Q: Can T491D477M006AT directly replace T491D477M006AS in existing designs?

A: Yes. T491D477M006AT is electrically and mechanically identical to the obsolete T491D477M006AS. Both specify 470 µF, 6.3 V, ±20% tolerance, 400 mOhm ESR, and 2917 (7343 Metric) package. The primary difference is product status and packaging format availability.

Q: What is the difference between ±20% and ±10% tolerance options?

A: Tolerance defines the allowable deviation from the nominal 470 µF capacitance value. ±20% permits a range of 376–564 µF, while ±10% restricts the range to 423–517 µF. Applications requiring tighter capacitance specifications should select ±10% tolerance parts such as T491D477K006AT or TAJD477K006RNJ.

Q: How does ESR affect component selection?

A: Equivalent Series Resistance (ESR) influences ripple current dissipation, transient response, and thermal performance. Lower ESR values (30–150 mOhm) improve performance in high-frequency or high-ripple-current applications. The baseline 400 mOhm ESR is suitable for general-purpose applications. ESR reduction does not affect capacitance or voltage rating compatibility.

Q: Are KEMET and KYOCERA AVX parts interchangeable?

A: Yes, provided electrical specifications match. TAJD477M006RNJ (KYOCERA AVX) and T491D477M006AT (KEMET) both specify 470 µF, 6.3 V, ±20% tolerance, and 400 mOhm ESR. Cross-manufacturer substitution is valid when all critical parameters align.

Q: What packaging formats are available?

A: Substitute parts are available in three formats: Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and unspecified packaging. Selection depends on assembly process requirements. CT & Digi-Reel® format is suitable for lower-volume or mixed-component assembly; TR format is optimized for high-volume automated placement.

Q: Does the 2917 package size remain constant across all substitutes?

A: Yes. All substitute parts maintain the 2917 (7343 Metric) package designation with identical physical dimensions: 0.287" L × 0.169" W (7.30 mm × 4.30 mm) and maximum seated height of 0.122" (3.10 mm), with the exception of T510X series parts which have a maximum seated height of 0.169" (4.30 mm). Verify PCB layout clearance for T510X alternatives.

Q: Are all substitutes ROHS3 compliant?

A: Most substitutes are ROHS3 compliant. Exceptions are T494D477M006AH and TAJD477K006H, which are RoHS non-compliant. Verify compliance requirements for your application before selection.

Q: What is the operating temperature range for all substitutes?

A: All substitute parts operate across the -55°C to 125°C temperature range, matching the original T491D477M006AS specification.

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