Equivalent & Substitute Parts for T491D685M050AS

Part Overview

The T491D685M050AS is a 6.8 µF molded tantalum capacitor manufactured by KEMET, rated for 50 V operation in a 2917 (7343 Metric) surface mount package. This component is classified as obsolete, indicating discontinuation from the manufacturer. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for applications utilizing this capacitor specification.

Substiute Parts

T491D685M050AS

KEMETIn Stock: 1025T491D685M050AS Datasheet

Current PartRFQ

T491D685M050AT

KEMETIn Stock: 3014T491D685M050AT Datasheet

DirectRFQ

TAJD685K050H

KYOCERA AVXIn Stock: 1012TAJD685K050H Datasheet

UpgradeRFQ

293D685X0050D2TE3

Vishay SpragueIn Stock: 1713293D685X0050D2TE3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the T491D685M050AS is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Capacitance: 6.8 µF (exact match required)
• Voltage Rating: 50 V (exact match required)
• Package / Case: 2917 (7343 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Type: Molded Tantalum (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Allowable Variation Parameters:

• Tolerance: ±20% (primary specification); ±10% acceptable as upgrade
• ESR: 1 Ohm (primary specification); 900 mOhm acceptable as improvement
• Product Status: Obsolete parts may be substituted with Active parts
• RoHS Compliance: Non-compliant parts may be substituted with compliant alternatives

Three substitute parts meet these criteria and are grouped as follows:

Direct Equivalent (Same Manufacturer): T491D685M050AT (KEMET) — identical electrical and mechanical specifications with improved product status and RoHS3 compliance.

Upgrade Substitute (Enhanced Tolerance): TAJD685K050H (KYOCERA AVX) — tighter tolerance (±10%) with identical core specifications.

Similar Substitute (Improved ESR): 293D685X0050D2TE3 (Vishay Sprague) — lower ESR (900 mOhm) with RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): Select T491D685M050AT when supply continuity and design validation are priorities. This part is manufactured by the same supplier (KEMET), maintains identical electrical and mechanical specifications, and carries Active product status with ROHS3 compliance. The specified lifetime rating of 2000 hours at 125°C provides additional reliability documentation.

For Enhanced Performance: Select TAJD685K050H when tighter capacitance tolerance (±10% versus ±20%) is required by circuit design specifications. This upgrade maintains all other electrical and mechanical parameters while improving tolerance performance. Note that RoHS compliance status differs from the main part.

For Optimized ESR Performance: Select 293D685X0050D2TE3 when lower equivalent series resistance (900 mOhm versus 1 Ohm) is beneficial for high-frequency or low-impedance circuit applications. This part carries ROHS3 compliance and Active product status. The ESR improvement of 10% may reduce thermal dissipation in ripple-current-sensitive applications.

All three substitute parts are electrically and mechanically compatible with the T491D685M050AS within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can T491D685M050AT be used as a direct replacement for T491D685M050AS?

A: Yes. T491D685M050AT is a direct equivalent manufactured by KEMET with identical capacitance (6.8 µF), voltage rating (50 V), tolerance (±20%), package (2917), and operating temperature range (-55°C to 125°C). The primary differences are product status (Active versus Obsolete) and RoHS3 compliance.

Q: What is the difference between the three substitute parts?

A: T491D685M050AT is a direct equivalent from the same manufacturer. TAJD685K050H offers tighter tolerance (±10%) from KYOCERA AVX. 293D685X0050D2TE3 provides lower ESR (900 mOhm) from Vishay Sprague. All three maintain identical capacitance, voltage, package, and operating temperature specifications.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts are supplied in Tape & Reel (TR) packaging, suitable for automated assembly. The T491D685M050AS original part does not specify packaging format in the provided data.

Q: Does tolerance difference affect circuit compatibility?

A: Tolerance differences (±20% versus ±10%) affect capacitance accuracy. Applications requiring tighter capacitance tolerance should specify TAJD685K050H (±10%). Applications with ±20% tolerance margin can use any of the three substitutes.

Q: Is RoHS compliance mandatory for substitution?

A: RoHS compliance is not mandatory for electrical substitution but may be required by procurement or regulatory policies. T491D685M050AT and 293D685X0050D2TE3 are ROHS3 compliant; TAJD685K050H is non-compliant.

Q: How does ESR difference impact circuit performance?

A: ESR (Equivalent Series Resistance) affects impedance and thermal dissipation. The 293D685X0050D2TE3 with 900 mOhm ESR provides 10% lower impedance compared to the 1 Ohm specification of other parts. This may reduce ripple voltage and heat generation in high-frequency or high-current applications.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes. All substitute parts share identical package dimensions (2917 / 7343 Metric), footprint, and mounting type (Surface Mount). PCB layout and assembly processes require no modification.