T491B686K004AT4153 Equivalent & Substitute Parts

Part Overview

The T491B686K004AT4153 is a 68 µF molded tantalum capacitor manufactured by KEMET, rated for 4 V operation in the 1411 (3528 Metric) package. This component is classified as a general-purpose surface-mount capacitor with an operating temperature range of -55°C to 125°C and a lifetime specification of 2000 hours at 125°C. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across manufacturers, ensuring functional interchangeability in circuit applications without design modification.

Substiute Parts

T491B686K004AT4153

KEMETIn Stock: 698T491B686K004AT4153 Datasheet

Current PartRFQ

TCKOG686BT

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the T491B686K004AT4153 is determined by strict equivalence across the following critical parameters:

• Capacitance Value: 68 µF (exact match required)
• Voltage Rating: 4 V (exact match required)
• Tolerance: ±10% (exact match required)
• Package / Case: 1411 (3528 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Lifetime Specification: 2000 Hrs @ 125°C (exact match required)
• Type: Molded Tantalum (exact match required)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

The TCKOG686BT from Cal-Chip Electronics, Inc. meets all substitution criteria and is classified as a parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the T491B686K004AT4153 and TCKOG686BT are active production components with full regulatory compliance. The TCKOG686BT demonstrates a marginally lower ESR value (1.7 Ohm versus 1.8 Ohm), which represents an operational advantage in applications sensitive to impedance characteristics. Both parts maintain identical electrical ratings, thermal specifications, and package dimensions, confirming direct substitution capability.

The Cal-Chip Electronics TCKOG686BT carries RoHS compliance certification and maintains REACH unaffected status, matching the regulatory posture of the KEMET original. Selection between these parts may be determined by availability, lead time, or procurement requirements, as both satisfy all specified electrical and mechanical criteria.

Frequently Asked Questions (FAQ)

Q: Can the TCKOG686BT be used as a direct replacement for the T491B686K004AT4153 in existing designs?

A: Yes. The TCKOG686BT meets all critical electrical and mechanical parameters: 68 µF capacitance, 4 V rating, ±10% tolerance, 1411 (3528 Metric) package, surface-mount configuration, and identical operating temperature range. No circuit redesign or PCB modification is required.

Q: Are there differences in ESR between these parts?

A: The TCKOG686BT has an ESR of 1.7 Ohm compared to 1.8 Ohm for the T491B686K004AT4153. This 0.1 Ohm difference is within normal manufacturing tolerance for molded tantalum capacitors and does not affect functional interchangeability in general-purpose applications.

Q: Do both parts have the same moisture sensitivity rating?

A: Yes. Both the T491B686K004AT4153 and TCKOG686BT are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Are both parts RoHS compliant?

A: Yes. The T491B686K004AT4153 is RoHS3 compliant, and the TCKOG686BT is RoHS compliant. Both meet current environmental regulations for electronic components.

Q: What is the physical footprint compatibility?

A: Both parts use the 1411 (3528 Metric) package with identical dimensions: 0.138" L x 0.110" W (3.50mm x 2.80mm) and maximum seated height of 0.083" (2.10mm). PCB layouts and assembly processes require no modification.

Q: Are both parts suitable for the full -55°C to 125°C temperature range?

A: Yes. Both the T491B686K004AT4153 and TCKOG686BT are rated for continuous operation across -55°C to 125°C with a lifetime specification of 2000 hours at 125°C.