T520B686M004ATE025 Equivalent & Substitute Parts

Part Overview

The T520B686M004ATE025 is a 68 µF molded tantalum polymer capacitor from KEMET's KO-CAP® T520 series, rated for 4 V operation. This component is designed for general-purpose surface-mount applications requiring low equivalent series resistance and stable performance across extended temperature ranges. The part maintains Active product status with full RoHS3 compliance and REACH unaffected designation.

Substitute parts become necessary when circuit design requirements change, such as increased voltage margin specifications, inventory constraints, or system-level reliability upgrades. Alternative models within the same series maintain identical capacitance, package geometry, and electrical characteristics while offering enhanced voltage ratings or alternative packaging configurations.

Substiute Parts

T520B686M004ATE025

KEMETIn Stock: 1119T520B686M004ATE025 Datasheet

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T520B686M006ATE025

KEMETIn Stock: 2144T520B686M006ATE025 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the T520B686M004ATE025 is determined by strict adherence to the following parameters:

Primary Substitution Criteria:

• Capacitance: 68 µF (exact match required)
• Package / Case: 1411 (3528 Metric) (exact match required)
• Physical Dimensions: 3.50mm x 2.80mm, Height 2.00mm max (exact match required)
• ESR @ 100kHz: 25 mOhm (exact match required)
• Type: Molded Tantalum Polymer (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -55°C to 105°C (exact match required)
• Tolerance: ±20% (exact match required)

Allowable Variation Parameter:

• Voltage - Rated: May be increased above 4 V while maintaining all other specifications

The substitute part T520B686M006ATE025 meets all primary criteria with an increased voltage rating of 6.3 V, providing enhanced voltage margin for circuit protection without altering physical footprint, capacitance value, or thermal performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

T520B686M004ATE025 Selection Criteria: Select this part when circuit design specifications require exactly 4 V rated voltage with 68 µF capacitance in the 1411 package. This configuration is appropriate for applications with strict voltage margin constraints or legacy system compatibility requirements.

T520B686M006ATE025 Selection Criteria: Select this substitute when circuit operating voltage permits 6.3 V rated components. The increased voltage rating provides additional safety margin without modifying physical footprint, capacitance value, ESR characteristics, or thermal performance. Both parts maintain identical Active product status, ROHS3 compliance, and REACH unaffected designation, ensuring equivalent regulatory and environmental compliance.

Both parts are manufactured by KEMET within the KO-CAP® T520 series and share identical mechanical compatibility with 1411 (3528 Metric) package footprints. Selection between these parts depends solely on circuit voltage requirements and available design margin.

Frequently Asked Questions (FAQ)

Q: Can T520B686M006ATE025 replace T520B686M004ATE025 in all applications?

A: T520B686M006ATE025 can replace T520B686M004ATE025 only when the circuit design permits operation with a 6.3 V rated component. The higher voltage rating does not affect capacitance value, package dimensions, ESR, or thermal characteristics. Verify that circuit maximum operating voltage does not exceed 6.3 V and that no design specification explicitly requires 4 V rated components.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both T520B686M004ATE025 and T520B686M006ATE025 share identical package geometry: 1411 (3528 Metric) with dimensions of 3.50mm length, 2.80mm width, and 2.00mm maximum seated height. PCB footprints and assembly processes are interchangeable.

Q: What is the difference in ESR between these parts?

A: There is no difference. Both parts specify 25 mOhm equivalent series resistance at 100 kHz. ESR performance is identical across the substitution pair.

Q: Do these parts have different moisture sensitivity levels?

A: No. Both T520B686M004ATE025 and T520B686M006ATE025 carry MSL Rating 3 with 168-hour moisture sensitivity specification. Handling, storage, and reflow procedures are identical.

Q: Are both parts RoHS3 compliant?

A: Yes. Both T520B686M004ATE025 and T520B686M006ATE025 are ROHS3 compliant and REACH unaffected, meeting identical regulatory requirements for restricted substance compliance.

Q: What is the capacitance tolerance for these parts?

A: Both parts specify ±20% capacitance tolerance. Actual capacitance values fall within the range of 54.4 µF to 81.6 µF for the 68 µF nominal rating.

Q: Can these parts operate at the same temperature range?

A: Yes. Both parts operate across -55°C to 105°C with 2000-hour lifetime specification at 105°C. Thermal performance and derating characteristics are identical.