T491B225M035AT4513 Equivalent & Substitute Parts

Part Overview

The T491B225M035AT4513 is a 2.2 µF molded tantalum capacitor manufactured by KEMET, rated for 35 V with ±20% tolerance. This component operates across the temperature range of -55°C to 125°C with a lifetime specification of 2000 hours at 125°C. The part is housed in a 1411 (3528 Metric) surface mount package with an equivalent series resistance (ESR) of 4 Ohm and is classified as general purpose. The product maintains Active status and is ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained within the allowed specifications for molded tantalum capacitors in this category. Substitutes must match or exceed the core functional requirements: capacitance value, voltage rating, package dimensions, mounting type, and operating temperature range.

Substiute Parts

T491B225M035AT4513

KEMETIn Stock: 1032T491B225M035AT4513 Datasheet

Current PartRFQ

TCKIV225BT

Cal-Chip Electronics, Inc.In Stock: 19108TCKIV225BT Datasheet

Parametric EquivalentRFQ

TCMIV225BT

Cal-Chip Electronics, Inc.In Stock: 18867TCMIV225BT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the T491B225M035AT4513 are qualified based on the following criteria:

Mandatory Matching Parameters:

• Capacitance: 2.2 µF (exact match required)
• Voltage Rating: 35 V (exact match required)
• Package / Case: 1411 (3528 Metric) (exact match required)
• Size / Dimension: 0.138" L x 0.110" W (3.50mm x 2.80mm) (exact match required)
• Height - Seated (Max): 0.083" (2.10mm) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Type: Molded (exact match required)

Allowable Variation Parameters:

• Tolerance: ±20% (main part) to ±10% (substitute acceptable; tighter tolerance is allowable)
• ESR: 4 Ohm (main part) to 4.2 Ohm (substitute acceptable; minor variation within component class tolerance)
• Lifetime @ Temp.: 2000 Hrs @ 125°C (exact match required)

The substitute parts identified (TCKIV225BT and TCMIV225BT) maintain all mandatory parameters while demonstrating compliance with RoHS3, MSL 1, and REACH Unaffected status equivalent to the main part.

Parameter Comparison

Engineering Selection Recommendations

TCKIV225BT Selection Criteria: The TCKIV225BT offers a tighter tolerance specification of ±10% compared to the T491B225M035AT4513 at ±20%. This substitute is suitable for applications requiring improved capacitance accuracy. The ESR specification of 4.2 Ohm is within acceptable variation for molded tantalum capacitors of this class. Both parts maintain identical voltage rating, package dimensions, operating temperature range, and lifetime specifications. ROHS3 compliance, MSL 1 rating, and REACH Unaffected status are equivalent.

TCMIV225BT Selection Criteria: The TCMIV225BT maintains the same ±20% tolerance as the main part, providing direct functional equivalence. The ESR specification of 4.2 Ohm is within acceptable variation. All electrical and mechanical parameters, compliance certifications, and reliability specifications are identical to the T491B225M035AT4513. This substitute is appropriate for direct replacement in applications where tolerance and ESR characteristics are not critical differentiators.

Both substitute parts are manufactured by Cal-Chip Electronics, Inc., maintain Active product status, and are available in Tape & Reel (TR) packaging. Selection between TCKIV225BT and TCMIV225BT depends on application-specific tolerance requirements.

Frequently Asked Questions (FAQ)

Q: Can TCKIV225BT and TCMIV225BT be used interchangeably with T491B225M035AT4513?

A: Both substitute parts meet the mandatory electrical and mechanical parameters. TCMIV225BT provides direct functional equivalence with matching ±20% tolerance. TCKIV225BT offers improved tolerance at ±10%. Selection depends on application requirements for capacitance accuracy and ESR performance.

Q: What is the significance of the ESR difference between the main part (4 Ohm) and substitutes (4.2 Ohm)?

A: The ESR variation of 0.2 Ohm is within the acceptable range for molded tantalum capacitors in this category. This minor difference does not affect functional compatibility in general purpose applications. Applications with specific ESR requirements should be evaluated against the actual circuit performance criteria.

Q: Are the package dimensions identical across all three parts?

A: Yes. The T491B225M035AT4513, TCKIV225BT, and TCMIV225BT all use the 1411 (3528 Metric) package with dimensions of 0.138" L x 0.110" W (3.50mm x 2.80mm) and maximum seated height of 0.083" (2.10mm). These parts are mechanically interchangeable in surface mount applications.

Q: Do all three parts meet the same compliance and environmental standards?

A: Yes. All three parts are ROHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity rating, and maintain REACH Unaffected status. Operating temperature range (-55°C ~ 125°C) and lifetime specification (2000 Hrs @ 125°C) are identical across all parts.

Q: What is the primary difference between TCKIV225BT and TCMIV225BT?

A: The primary difference is tolerance specification. TCKIV225BT offers ±10% tolerance, while TCMIV225BT matches the main part at ±20% tolerance. Both maintain identical voltage rating, capacitance, package, and operating specifications. ESR is 4.2 Ohm for both Cal-Chip parts.

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

A: Yes. All three parts are supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes. Inventory availability differs by manufacturer and part number.