T491D686M006AT4539 Equivalent & Substitute Parts

Part Overview

The T491D686M006AT4539 is a 68 µF molded tantalum capacitor manufactured by KEMET, rated for 6.3 V operation in a 2917 (7343 Metric) surface mount package. This component is classified as Active product status and is designed for general-purpose applications requiring stable capacitance and low equivalent series resistance in compact form factors.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the main component specifications, enabling direct replacement in circuit designs without modification to PCB layouts or electrical schematics.

Substiute Parts

T491D686M006AT4539

KEMETIn Stock: 1112T491D686M006AT4539 Datasheet

Current PartRFQ

TCMOJ686DT

Cal-Chip Electronics, Inc.In Stock: 6557TCMOJ686DT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the T491D686M006AT4539 is determined by strict alignment of the following critical parameters:

Electrical Parameters:

• Capacitance value: 68 µF (exact match required)
• Voltage rating: 6.3 V (exact match required)
• Tolerance: ±20% (exact match required)
• Operating temperature range: -55°C to 125°C (exact match required)
• Lifetime specification: 2000 Hrs @ 125°C (exact match required)

Mechanical Parameters:

• Package / Case: 2917 (7343 Metric) (exact match required)
• Mounting type: Surface Mount (exact match required)
• Physical dimensions: 0.287" L x 0.169" W; Height 0.122" max (exact match required)

Compliance Parameters:

• RoHS3 Compliant status (exact match required)
• REACH Unaffected status (exact match required)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

The substitute part TCMOJ686DT meets all critical electrical, mechanical, and compliance parameters, enabling direct functional replacement in applications utilizing the T491D686M006AT4539.

Parameter Comparison

Engineering Selection Recommendations

Both the T491D686M006AT4539 and TCMOJ686DT are Active product status components with full RoHS3 compliance and REACH Unaffected designation, meeting current regulatory requirements for electronic component manufacturing and deployment.

Selection between these parts is based on availability, lead time, and supply chain considerations. Both components satisfy identical electrical specifications, mechanical form factors, and environmental operating conditions. The difference in ESR (800 mOhm versus 1.6 Ohm) reflects manufacturing process variations between KEMET and Cal-Chip Electronics but does not affect substitution eligibility for general-purpose tantalum capacitor applications within the specified parameter envelope.

Component selection should prioritize inventory availability and procurement timelines when both parts meet circuit design requirements.

Frequently Asked Questions (FAQ)

Q: Can TCMOJ686DT replace T491D686M006AT4539 in existing designs?

A: Yes. Both components share identical capacitance (68 µF), voltage rating (6.3 V), tolerance (±20%), package (2917/7343 Metric), and operating temperature range (-55°C to 125°C). Physical dimensions and mounting characteristics are identical, enabling direct PCB substitution without layout modification.

Q: What is the significance of the ESR difference between these parts?

A: The T491D686M006AT4539 specifies 800 mOhm ESR while TCMOJ686DT specifies 1.6 Ohm ESR. This difference reflects manufacturing process variations between manufacturers. For general-purpose applications, both values fall within acceptable ranges for molded tantalum capacitors in this voltage and capacitance class. Circuit-specific ESR requirements should be evaluated against application ripple current and thermal dissipation specifications.

Q: Are both parts suitable for high-temperature applications?

A: Yes. Both components operate across the -55°C to 125°C temperature range with 2000-hour lifetime specification at 125°C, meeting requirements for industrial and automotive temperature environments.

Q: Do these parts require different handling or storage procedures?

A: No. Both components carry Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture control requirements during storage, handling, or assembly. Standard ESD precautions apply to all tantalum capacitor handling.

Q: Are there compliance differences between these parts?

A: No. Both T491D686M006AT4539 and TCMOJ686DT are ROHS3 Compliant and REACH Unaffected, meeting identical regulatory standards for electronic component use in regulated markets.

Q: What packaging formats are available for these parts?

A: Both components are supplied in Tape & Reel (TR) format, standard for surface mount production environments and automated assembly processes.