T491B225K025AS-F Equivalent & Substitute Parts

Part Overview

The T491B225K025AS-F is a 2.2 µF molded tantalum capacitor rated for 25 V, manufactured by Cornell Dubilier Electronics (CDE) in the 1411 (3528 Metric) package. This component is classified as obsolete, indicating that CDE has discontinued production. The part operates across a temperature range of -55°C to 125°C and is suitable for general-purpose applications requiring surface-mount tantalum capacitors with ±10% capacitance tolerance.

Due to the obsolete status of the T491B225K025AS-F, locating equivalent substitute parts is necessary for ongoing production, maintenance, and repair applications. Active alternatives meeting identical electrical and mechanical specifications are available from other manufacturers.

Substiute Parts

T491B225K025AS-F

Cornell Dubilier Electronics (CDE)In Stock: 1040T491B225K025AS-F Datasheet

Current PartRFQ

T491B225K025AT

KEMETIn Stock: 3682T491B225K025AT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the T491B225K025AS-F is determined by strict equivalence across the following critical parameters:

• Capacitance Value: 2.2 µF (exact match required)
• Voltage Rating: 25 V (exact match required)
• Capacitance Tolerance: ±10% (exact match required)
• Package / Case: 1411 (3528 Metric) (exact match required for PCB compatibility)
• Mounting Type: Surface Mount (exact match required)
• Type: Molded Tantalum (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

The substitute part T491B225K025AT meets all of these criteria and belongs to the same T491 series, confirming direct substitutability at the component level.

Parameter Comparison

Engineering Selection Recommendations

The T491B225K025AT manufactured by KEMET is a direct substitute for the obsolete T491B225K025AS-F. Both components share identical electrical specifications (2.2 µF, 25 V, ±10% tolerance), mechanical dimensions (1411 / 3528 Metric package), and environmental compliance ratings (ROHS3 Compliant, MSL 1).

The T491B225K025AT holds active product status, ensuring ongoing availability and supply chain continuity. The substitute part provides documented ESR of 4.5 Ohm and a lifetime specification of 2000 hours at 125°C, offering additional performance transparency compared to the main part.

Both components are suitable for general-purpose surface-mount applications requiring molded tantalum capacitors within the specified voltage and temperature parameters. The identical package footprint and mounting type ensure direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the T491B225K025AT be used as a direct replacement for the T491B225K025AS-F?

A: Yes. The T491B225K025AT meets all critical electrical and mechanical specifications of the T491B225K025AS-F, including capacitance (2.2 µF), voltage rating (25 V), tolerance (±10%), package type (1411 / 3528 Metric), and operating temperature range (-55°C ~ 125°C). Both components are ROHS3 compliant with MSL 1 rating.

Q: Are there any physical differences between these two parts?

A: No. Both components share identical dimensions: 0.138" L x 0.110" W (3.50mm x 2.80mm) with a maximum seated height of 0.083" (2.10mm). The manufacturer size code is B for both parts, confirming identical physical form factors.

Q: Why is the T491B225K025AS-F listed as obsolete?

A: The T491B225K025AS-F is an obsolete product manufactured by Cornell Dubilier Electronics (CDE). CDE has discontinued production of this component. The T491B225K025AT from KEMET provides an active alternative with identical specifications.

Q: What is the difference in ESR between the main part and the substitute?

A: The T491B225K025AS-F does not have a specified ESR value. The T491B225K025AT specifies an ESR of 4.5 Ohm. This specification provides additional performance data for the substitute part but does not affect substitutability for general-purpose applications.

Q: Are both parts suitable for the same temperature range?

A: Yes. Both the T491B225K025AS-F and T491B225K025AT operate across the identical temperature range of -55°C to 125°C, ensuring thermal compatibility in the same application environments.

Q: What is the moisture sensitivity level for these capacitors?

A: Both components have a Moisture Sensitivity Level (MSL) of 1, which indicates unlimited shelf life without moisture control requirements. Standard handling and storage practices are sufficient for both parts.