T491B686M004AT4153 Equivalent & Substitute Parts

Part Overview

The T491B686M004AT4153 is a 68 µF molded tantalum capacitor manufactured by KEMET, rated for 4 V operation in the 1411 (3528 Metric) package. This component is designed for general-purpose surface mount applications requiring stable capacitance and low equivalent series resistance. The part maintains active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Substiute Parts

T491B686M004AT4153

KEMETIn Stock: 960T491B686M004AT4153 Datasheet

Current PartRFQ

TCKOG686BT

Cal-Chip Electronics, Inc.In Stock: 56904TCKOG686BT Datasheet

Parametric EquivalentRFQ

TCMOG686BT

Cal-Chip Electronics, Inc.In Stock: 56791TCMOG686BT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the T491B686M004AT4153 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Electrical Parameters:

• Capacitance: 68 µF (exact match required)
• Voltage Rating: 4 V (exact match required)
• Type: Molded tantalum (exact match required)

Mechanical Parameters:

• 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)

Performance Parameters:

• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Lifetime @ Temp.: 2000 Hrs @ 125°C (exact match required)

Compliance Parameters:

• RoHS Status: RoHS Compliant (equivalent or superior compliance acceptable)
• Moisture Sensitivity Level (MSL): 1 (Unlimited) (exact match required)

Tolerance and ESR variations within acceptable ranges do not disqualify substitution when all other parameters align.

Parameter Comparison

Engineering Selection Recommendations

Both Cal-Chip substitute parts (TCKOG686BT and TCMOG686BT) satisfy all critical electrical and mechanical compatibility requirements for the T491B686M004AT4153.

TCKOG686BT Selection Criteria: This substitute features ±10% tolerance compared to the original ±20% tolerance, providing tighter capacitance control. ESR is 1.7 Ohm versus 1.8 Ohm in the original part, representing a marginal improvement in series resistance performance. All compliance certifications (RoHS, REACH, MSL) are equivalent or superior. This part is suitable for applications requiring enhanced capacitance accuracy.

TCMOG686BT Selection Criteria: This substitute maintains the ±20% tolerance specification identical to the original part, ensuring direct functional equivalence. ESR is 1.7 Ohm, providing equivalent or superior performance. All compliance certifications match the original part requirements. This part is suitable for direct replacement in applications with existing ±20% tolerance specifications.

Both substitute parts are manufactured by Cal-Chip Electronics, Inc., carry active product status, and maintain full compliance with RoHS and REACH regulations. Selection between the two substitutes depends on tolerance requirements specific to the application circuit design.

Frequently Asked Questions (FAQ)

Q: Can TCKOG686BT or TCMOG686BT be used as direct replacements for T491B686M004AT4153 on existing PCB assemblies?

A: Yes. Both substitute parts are mechanically and electrically compatible. They share identical package dimensions (1411/3528 Metric), footprint requirements, and mounting specifications. No PCB layout modifications are required.

Q: What is the difference between TCKOG686BT and TCMOG686BT?

A: The primary difference is capacitance tolerance. TCKOG686BT specifies ±10% tolerance, while TCMOG686BT specifies ±20% tolerance. Both parts have identical 68 µF capacitance, 4 V rating, and 1.7 Ohm ESR. Selection depends on circuit tolerance requirements.

Q: Are there compliance differences between the original part and substitutes?

A: All three parts maintain RoHS compliance and REACH Unaffected status. The original T491B686M004AT4153 carries ROHS3 certification, while Cal-Chip substitutes carry RoHS certification. Both certifications satisfy RoHS regulatory requirements. Moisture Sensitivity Level (MSL) is identical at Level 1 (Unlimited) across all parts.

Q: How do ESR specifications compare across these parts?

A: The original T491B686M004AT4153 specifies 1.8 Ohm ESR. Both Cal-Chip substitutes (TCKOG686BT and TCMOG686BT) specify 1.7 Ohm ESR. The lower ESR in substitute parts represents equivalent or improved performance characteristics.

Q: Are operating temperature ranges identical?

A: Yes. All three parts operate across the identical temperature range of -55°C to 125°C with 2000 hours lifetime specification at 125°C.

Q: What packaging format is used for these parts?

A: All three parts are supplied in Tape & Reel (TR) packaging suitable for automated surface mount assembly processes.