T494D475K050AS Molded Tantalum Capacitor 4.7µF 50V 2917 Equivalent & Substitute Parts

Part Overview

The T494D475K050AS is a 4.7 µF molded tantalum capacitor rated at 50 V in 2917 (7343 Metric) package form factor, manufactured by KEMET. This component is classified as obsolete product status. The T494 series has been discontinued, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for circuit board replacement and new design applications.

Key Parameters

Parameter	Value
Capacitance	4.7 µF
Tolerance	±10%
Voltage Rating	50 V
Type	Molded Tantalum
Package / Case	2917 (7343 Metric)
Mounting Type	Surface Mount
Operating Temperature Range	-55°C to 125°C
Moisture Sensitivity Level	MSL 1 (Unlimited)
ESR (Equivalent Series Resistance)	600 mOhm

Substitute Part Grouping Explanation

Substitution of the T494D475K050AS is determined by strict equivalence across the following parameters:

Mandatory Matching Parameters:

Capacitance: 4.7 µF
Tolerance: ±10%
Voltage Rating: 50 V
Package / Case: 2917 (7343 Metric)
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 125°C
Moisture Sensitivity Level: MSL 1

Variable Parameters (Allowable Differences):

ESR (Equivalent Series Resistance): Substitutes may have different ESR values (300 mOhm to 1.4 Ohm) provided circuit design accommodates the variation
Product Status: Active substitutes are preferred over obsolete status
RoHS Compliance: Substitutes may differ in RoHS compliance status
Packaging Format: Tape & Reel (TR) packaging is functionally equivalent to bulk packaging for the same component

Substitutes are grouped into three categories: Direct Manufacturer Equivalent (same manufacturer, active status), Upgrade Alternative (different manufacturer, enhanced reliability features), and Similar Alternatives (different manufacturers, variable ESR specifications).

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	ESR	Package	Product Status	RoHS Status	Packaging Format
T494D475K050AS	KEMET	4.7 µF	50 V	600 mOhm	2917	Obsolete	Non-compliant	Bulk
T494D475K050AT	KEMET	4.7 µF	50 V	600 mOhm	2917	Active	RoHS3 Compliant	Tape & Reel
T83D475K050EZZL	Vishay Sprague	4.7 µF	50 V	600 mOhm	2917	Active	Non-compliant	Bulk
TAJD475K050H	KYOCERA AVX	4.7 µF	50 V	1.4 Ohm	2917	Active	Non-compliant	Bulk
TAJD475K050HNJ	KYOCERA AVX	4.7 µF	50 V	1.4 Ohm	2917	Active	Non-compliant	Bulk
TPSD475K050H0300	KYOCERA AVX	4.7 µF	50 V	300 mOhm	2917	Active	Non-compliant	Tape & Reel
TPSD475K050H0500	KYOCERA AVX	4.7 µF	50 V	500 mOhm	2917	Active	Non-compliant	Tape & Reel
TPSD475K050H0700	KYOCERA AVX	4.7 µF	50 V	700 mOhm	2917	Active	Non-compliant	Tape & Reel
TR3D475K050C0300	Vishay Sprague	4.7 µF	50 V	300 mOhm	2917	Active	RoHS3 Compliant	Tape & Reel

Engineering Selection Recommendations

Direct Manufacturer Equivalent (Preferred for Continuity):

T494D475K050AT from KEMET is the direct active equivalent to the obsolete T494D475K050AS. Both components share identical electrical specifications (4.7 µF, 50 V, 600 mOhm ESR) and mechanical form factor. T494D475K050AT carries RoHS3 compliance status, addressing regulatory requirements for new production. This part is available in Tape & Reel packaging format suitable for automated assembly processes.

Upgrade Alternative (Enhanced Reliability):

TR3D475K050C0300 from Vishay Sprague TANTAMOUNT™ series offers improved ESR performance at 300 mOhm compared to the original 600 mOhm specification. This component is RoHS3 compliant and maintains all mechanical and electrical compatibility. The reduced ESR provides lower impedance characteristics beneficial for high-frequency filtering applications.

Similar Alternatives (Variable ESR Options):

KYOCERA AVX TAJ and TPS series components provide functional equivalence with ESR variations. TAJD475K050H and TAJD475K050HNJ feature 1.4 Ohm ESR, suitable for applications where higher impedance is acceptable. TPSD475K050H series (300 mOhm, 500 mOhm, 700 mOhm variants) offers ESR selection flexibility for circuit optimization. All alternatives maintain the 2917 package footprint and -55°C to 125°C operating range.

Compliance Considerations:

For applications requiring RoHS3 compliance, select T494D475K050AT or TR3D475K050C0300. For legacy systems without compliance requirements, all listed alternatives are functionally compatible.

Frequently Asked Questions (FAQ)

Q: Can T494D475K050AT directly replace T494D475K050AS on existing circuit boards?

A: Yes. T494D475K050AT is the direct active equivalent with identical capacitance (4.7 µF), voltage rating (50 V), ESR (600 mOhm), and 2917 package dimensions. The only differences are product status (active vs. obsolete) and RoHS3 compliance. No circuit modifications are required.

Q: What is the significance of ESR differences among substitute parts?

A: ESR (Equivalent Series Resistance) affects impedance characteristics at high frequencies. The original T494D475K050AS specifies 600 mOhm. Substitutes with lower ESR (300 mOhm) provide improved high-frequency performance. Substitutes with higher ESR (1.4 Ohm) are acceptable if circuit design does not depend on low-impedance filtering. Verify ESR compatibility with circuit requirements before selection.

Q: Are Tape & Reel packaged parts functionally equivalent to bulk packaged parts?

A: Yes. Tape & Reel and bulk packaging formats contain identical components. The difference is presentation format for automated assembly versus manual handling. Electrical and mechanical specifications remain unchanged. Tape & Reel format is standard for high-volume production environments.

Q: What does RoHS3 compliance mean for component selection?

A: RoHS3 compliance indicates the component meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. For new product designs or applications subject to regulatory requirements, select RoHS3 compliant alternatives (T494D475K050AT or TR3D475K050C0300). Legacy systems may use non-compliant alternatives.

Q: Can KYOCERA AVX TAJ series parts with 1.4 Ohm ESR replace the original 600 mOhm ESR component?

A: TAJD475K050H and TAJD475K050HNJ are mechanically and electrically compatible in terms of capacitance, voltage, and package. The 1.4 Ohm ESR is significantly higher than the original 600 mOhm. This substitution is valid only if circuit design accommodates higher impedance. Applications requiring low-impedance filtering may experience performance degradation.

Q: What inventory considerations apply to these substitutes?

A: T494D475K050AT (2900 pcs), TPSD475K050H0300 (1606 pcs), and TAJD475K050HNJ (1,000,300 pcs) offer substantial inventory availability. TR3D475K050C0300 (1682 pcs) and other alternatives provide adequate stock for production requirements. Verify current inventory status with component suppliers for time-sensitive applications.

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