T491C226K006AS-F Equivalent & Substitute Parts

Part Overview

The T491C226K006AS-F is a 22 µF molded tantalum capacitor rated for 6 V operation in a 2312 (6032 Metric) surface mount package manufactured by Cornell Dubilier Electronics. This component is classified as obsolete, necessitating identification of functionally equivalent substitute parts for continued circuit implementation and board-level assembly. The substitute part maintains the same capacitance value, tolerance, package form factor, and operating temperature range while offering improved availability and active product status.

Substiute Parts

T491C226K006AS-F

Cornell Dubilier Electronics (CDE)In Stock: 718T491C226K006AS-F Datasheet

Current PartRFQ

T491C226K006AT

KEMETIn Stock: 2193T491C226K006AT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The T491C226K006AT functions as a direct substitute for the T491C226K006AS-F based on the following allowable parameters:

Critical Match Parameters:

• Capacitance: 22 µF (identical)
• Tolerance: ±10% (identical)
• Package: 2312 (6032 Metric) (identical physical form factor)
• Mounting Type: Surface Mount (identical)
• Physical Dimensions: 0.236" L x 0.126" W x 0.110" H max (identical)
• Operating Temperature: -55°C to 125°C (identical)
• RoHS Compliance: ROHS3 Compliant (identical)
• Moisture Sensitivity: MSL 1 (Unlimited) (identical)

Allowable Variation: The substitute part features a voltage rating of 6.3 V compared to the original 6 V specification. A higher voltage rating in the same package and footprint is functionally compatible with 6 V applications, as the component maintains superior voltage headroom and reliability margins. Both parts are manufactured using molded tantalum technology and are classified within the T491 series family.

Parameter Comparison

Engineering Selection Recommendations

The T491C226K006AT is the recommended substitute for applications currently using the obsolete T491C226K006AS-F. Selection is supported by the following engineering factors:

Product Status: The substitute maintains active product status through KEMET, ensuring long-term availability, consistent manufacturing quality, and established supply chain support compared to the discontinued CDE original.

Regulatory Compliance: Both components maintain identical RoHS3 compliance and MSL 1 moisture sensitivity classification, ensuring equivalence in environmental and regulatory requirements for board-level assembly and field deployment.

Electrical Compatibility: The 6.3 V rating of the substitute provides enhanced voltage margin over the 6 V rated original, maintaining circuit reliability in 6 V applications without derating. Identical capacitance and tolerance specifications ensure functional equivalence in filter, bypass, and energy storage applications.

Physical Compatibility: Identical package form factor (2312), physical dimensions (0.236" L x 0.126" W x 0.110" H max), and surface mount mounting type enable direct PCB footprint compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Can the T491C226K006AT be used as a drop-in replacement for the T491C226K006AS-F?

A: Yes. The substitute part is electrically and mechanically compatible. Identical capacitance (22 µF), tolerance (±10%), package form (2312), physical dimensions, mounting type, and operating temperature range (-55°C to 125°C) enable direct substitution without circuit design changes or PCB layout modification.

Q: What is the significance of the higher voltage rating (6.3 V vs. 6 V)?

A: A higher voltage rating in the same package provides additional design margin and stress relief in the application. This is an allowable parameter variation that improves reliability without compromising functional compatibility with 6 V circuits.

Q: Are there any compliance or certification differences between the original and substitute parts?

A: No. Both components maintain identical RoHS3 compliance and MSL 1 moisture sensitivity classification. Regulatory and environmental requirements are equivalent.

Q: What does MSL 1 (Unlimited) mean?

A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life without moisture conditioning requirements. The component can be stored and handled under standard industrial conditions without special dry-pack or nitrogen purge treatment.

Q: How do the manufacturers differ?

A: The original is manufactured by Cornell Dubilier Electronics (CDE), now obsolete. The substitute is manufactured by KEMET, an active supplier with established manufacturing and logistics infrastructure. This transition ensures component continuity and supply security.

Q: Is the ESR specification relevant for this substitution?

A: The original part does not specify ESR; the substitute specifies 1.8 Ω. In typical filtering and bypass applications, this specified value indicates predictable high-frequency performance. If ESR-critical applications require verification, the specified value should be referenced in circuit analysis.