Equivalent & Substitute Parts for T491B685K020AS-F

Part Overview

The T491B685K020AS-F is a 6.8 µF molded tantalum capacitor rated at 20 V, manufactured by Cornell Dubilier Electronics (CDE) in the T491 series. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement continuity. The part is designed for general-purpose surface-mount applications in the 1411 (3528 Metric) package format.

Substiute Parts

T491B685K020AS-F

Cornell Dubilier Electronics (CDE)In Stock: 1190T491B685K020AS-F Datasheet

Current PartRFQ

T491B685K020AT

KEMETIn Stock: 1131T491B685K020AT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the T491B685K020AS-F is determined by strict equivalence across the following parameters:

Primary Substitution Criteria:

• Capacitance: 6.8 µF (exact match required)
• Tolerance: ±10% (exact match required)
• Voltage Rating: 20 V (exact match required)
• Package / Case: 1411 (3528 Metric) (exact match required)
• Physical Dimensions: 0.138" L x 0.110" W, Height 0.083" max (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

Secondary Compliance Parameters:

• RoHS3 Compliance (required for regulatory alignment)
• Moisture Sensitivity Level 1 (required for handling compatibility)

The T491B685K020AT from KEMET meets all primary and secondary criteria and is classified as an active product, making it a direct functional equivalent to the obsolete T491B685K020AS-F.

Parameter Comparison

Engineering Selection Recommendations

The T491B685K020AT (KEMET) is the direct equivalent substitute for the obsolete T491B685K020AS-F (CDE). Selection is based on the following engineering factors:

Product Status: The T491B685K020AT is classified as an active product, ensuring ongoing availability and manufacturer support, whereas the T491B685K020AS-F is obsolete and subject to supply discontinuation.

Electrical Equivalence: Both parts share identical electrical specifications: 6.8 µF capacitance, ±10% tolerance, and 20 V rated voltage. The T491B685K020AT provides additional specification data (2.5 Ohm ESR and 2000 Hrs @ 125°C lifetime rating), which represents enhanced documentation rather than a functional difference.

Mechanical Compatibility: Both parts are housed in the 1411 (3528 Metric) package with identical physical dimensions (0.138" L x 0.110" W, 0.083" max height), ensuring direct board-level compatibility without layout modifications.

Regulatory Compliance: Both parts are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8532.21.0050) classifications, maintaining regulatory alignment for procurement and export purposes.

Handling and Storage: Both parts carry MSL 1 (Unlimited) moisture sensitivity rating, requiring no change to handling, storage, or assembly procedures.

Frequently Asked Questions (FAQ)

Q: Can the T491B685K020AT be used as a direct replacement for the T491B685K020AS-F without circuit modifications?

A: Yes. The T491B685K020AT meets all electrical and mechanical specifications of the T491B685K020AS-F. No circuit modifications are required. Both parts are rated for 6.8 µF at 20 V in the 1411 (3528 Metric) package with identical physical dimensions and operating temperature range.

Q: What is the difference between the CDE and KEMET versions?

A: Both parts are functionally equivalent. The primary difference is manufacturer and product status: the CDE version (T491B685K020AS-F) is obsolete, while the KEMET version (T491B685K020AT) is active. The KEMET part provides documented ESR (2.5 Ohm) and lifetime rating (2000 Hrs @ 125°C), whereas the CDE part does not specify these parameters.

Q: Are there any packaging differences between these parts?

A: The T491B685K020AT is supplied in Tape & Reel (TR) packaging. The original packaging format for the T491B685K020AS-F is not specified in available documentation. Both parts use the same 1411 (3528 Metric) case format and are compatible with standard surface-mount assembly equipment.

Q: Do both parts require the same handling procedures?

A: Yes. Both parts carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no moisture sensitivity restrictions. Handling, storage, and assembly procedures are identical for both parts.

Q: Is the T491B685K020AT available in the same quantities as the T491B685K020AS-F?

A: Inventory levels differ. The T491B685K020AS-F has 1146 Pcs in stock, while the T491B685K020AT has 1111 Pcs in stock. Both are available as new original components.

Q: Are there any compliance or export restrictions for the T491B685K020AT?

A: No additional restrictions apply. The T491B685K020AT carries the same ECCN (EAR99) and HTSUS (8532.21.0050) classifications as the T491B685K020AS-F, maintaining identical regulatory and export compliance status.