T491B334M050AS Equivalent & Substitute Parts

Part Overview

The T491B334M050AS is a 0.33 µF molded tantalum capacitor manufactured by KEMET, rated for 50 V operation with ±20% tolerance. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement. The part operates across a temperature range of -55°C to 125°C and is housed in a 1411 (3528 Metric) surface mount package with 10Ohm equivalent series resistance (ESR).

Substiute Parts

T491B334M050AS

KEMETIn Stock: 1000T491B334M050AS Datasheet

Current PartRFQ

T491B334M050AT

KEMETIn Stock: 2473T491B334M050AT Datasheet

DirectRFQ

293D334X0050B2TE3

Vishay SpragueIn Stock: 837293D334X0050B2TE3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the T491B334M050AS is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Capacitance value: 0.33 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage rating: 50 V (exact match required)
• ESR: 10Ohm (exact match required)
• Operating temperature range: -55°C to 125°C (exact match required)

Mechanical Parameters:

• Package type: 1411 (3528 Metric) surface mount (exact match required)
• Physical dimensions: 0.138" L x 0.110" W (3.50mm x 2.80mm) (exact match required)
• Maximum seated height: 0.083" (2.10mm) (exact match required)

Functional Parameters:

• Component type: Molded tantalum capacitor (exact match required)
• Moisture sensitivity: MSL 1 (Unlimited) (exact match required)

Substitute parts must satisfy all electrical, mechanical, and functional parameters without deviation. Packaging format (bulk versus tape & reel) does not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

T491B334M050AT (KEMET Direct Replacement)

The T491B334M050AT is the active equivalent from KEMET. This part maintains identical electrical and mechanical specifications to the obsolete T491B334M050AS. The primary distinction is product status: T491B334M050AT is active with documented lifetime rating of 2000 hours at 125°C. This part carries ROHS3 compliance, addressing regulatory requirements for new designs. Packaging is available in tape & reel format with 2400 units in current inventory.

293D334X0050B2TE3 (Vishay Sprague Cross-Manufacturer Substitute)

The 293D334X0050B2TE3 from Vishay Sprague provides cross-manufacturer substitution with identical electrical parameters and mechanical compatibility. Physical dimensions match the main part specification with maximum seated height of 0.083" (2.11mm), which falls within acceptable tolerance for the 1411 package footprint. This part is active and ROHS3 compliant. The Vishay part is available in tape & reel packaging with 795 units in inventory.

Both substitute parts satisfy all critical electrical and mechanical parameters required for direct substitution. Selection between KEMET and Vishay Sprague options depends on supply chain preference, inventory availability, and procurement lead time requirements.

Frequently Asked Questions (FAQ)

Q: Can T491B334M050AT be used as a direct replacement for T491B334M050AS?

A: Yes. The T491B334M050AT is electrically and mechanically identical to the T491B334M050AS. Both parts feature 0.33 µF capacitance, 50 V rating, ±20% tolerance, 10Ohm ESR, and 1411 (3528 Metric) surface mount packaging. The primary difference is product status: T491B334M050AT is active while T491B334M050AS is obsolete.

Q: What is the difference between T491B334M050AS and T491B334M050AT packaging?

A: The T491B334M050AS is supplied in bulk packaging, while T491B334M050AT is supplied in tape & reel (TR) format. Both packaging formats contain identical components with no electrical or mechanical differences. Tape & reel packaging is standard for automated assembly processes.

Q: Is the Vishay Sprague 293D334X0050B2TE3 compatible with the KEMET T491B334M050AS?

A: Yes. The 293D334X0050B2TE3 meets all electrical and mechanical specifications of the T491B334M050AS. Capacitance, voltage rating, tolerance, ESR, operating temperature range, package type, and physical dimensions are identical. Both parts are MSL 1 rated and ROHS3 compliant.

Q: What is the significance of the height difference between T491B334M050AS (2.10mm) and 293D334X0050B2TE3 (2.11mm)?

A: The 0.01mm difference in maximum seated height is within normal manufacturing tolerance for the 1411 (3528 Metric) package specification. This variation does not affect PCB layout, component placement, or electrical performance.

Q: Why is the T491B334M050AS marked as obsolete?

A: The T491B334M050AS is obsolete due to product lifecycle management by KEMET. The active equivalent T491B334M050AT provides identical functionality with current manufacturing support and compliance certifications.

Q: Are there RoHS compliance differences between the substitute parts?

A: Yes. The T491B334M050AS is RoHS non-compliant, while both T491B334M050AT and 293D334X0050B2TE3 are ROHS3 compliant. For new designs or applications requiring RoHS compliance, either substitute part is appropriate.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. All three parts—T491B334M050AS, T491B334M050AT, and 293D334X0050B2TE3—share identical electrical characteristics (0.33 µF, 50 V, ±20%, 10Ohm ESR) and mechanical specifications (1411 package, 3.50mm x 2.80mm, 2.10mm height). They are interchangeable at the component level.