T520B686M004ATE040 Equivalent & Substitute Parts

Part Overview

The T520B686M004ATE040 is a 68 µF molded tantalum polymer capacitor rated at 4 V, manufactured by KEMET under the KO-CAP® T520 series. This surface mount component features a 1411 (3528 Metric) package with an equivalent series resistance of 40 mOhm at 100 kHz. The part is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained while accommodating design flexibility or inventory availability requirements.

Substiute Parts

T520B686M004ATE040

KEMETIn Stock: 1006T520B686M004ATE040 Datasheet

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T520B686M006ATE040

KEMETIn Stock: 34025T520B686M006ATE040 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The T520B686M006ATE040 qualifies as a substitute for the T520B686M004ATE040 based on the following substitution criteria:

Maintained Parameters:

• Capacitance: 68 µF (identical)
• Tolerance: ±20% (identical)
• ESR: 40 mOhm @ 100 kHz (identical)
• Package / Case: 1411 (3528 Metric) (identical)
• Type: Molded Tantalum Polymer (identical)
• Operating Temperature Range: -55°C ~ 105°C (identical)
• Lifetime @ Temperature: 2000 Hrs @ 105°C (identical)
• Mounting Type: Surface Mount (identical)
• Physical Dimensions: 0.138" L x 0.110" W, 0.079" Max Height (identical)
• Moisture Sensitivity Level: 3 (168 Hours) (identical)
• RoHS Status: ROHS3 Compliant (identical)
• Series: KO-CAP® T520 (identical)
• Manufacturer Size Code: B (identical)

Differing Parameter:

• Voltage - Rated: 6.3 V (upgraded from 4 V)

The substitute part maintains all electrical and mechanical specifications while providing an increased voltage rating. This substitution is valid for applications where the circuit voltage does not exceed 4 V, as the higher-rated component operates within the original design envelope.

Parameter Comparison

Engineering Selection Recommendations

Both the T520B686M004ATE040 and T520B686M006ATE040 are Active product status components manufactured by KEMET and maintain ROHS3 compliance. The substitute part T520B686M006ATE040 is suitable for direct replacement in applications where the circuit voltage specification does not exceed 4 V. The higher voltage rating of the substitute part does not degrade performance in lower-voltage applications and provides additional design margin.

Selection between these parts should be based on circuit voltage requirements and inventory availability. Both components are certified for identical operating temperature ranges, moisture sensitivity levels, and reliability specifications. The identical package footprint, dimensions, and ESR characteristics ensure mechanical and electrical compatibility in surface mount assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the T520B686M006ATE040 (6.3 V) be used in place of the T520B686M004ATE040 (4 V)?

A: Yes. The substitute part maintains identical capacitance, tolerance, ESR, package dimensions, and thermal specifications. The increased voltage rating does not affect performance in circuits operating at or below 4 V.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both parts use the 1411 (3528 Metric) package with dimensions of 0.138" L x 0.110" W (3.50mm x 2.80mm) and a maximum seated height of 0.079" (2.00mm). They are mechanically interchangeable on the PCB.

Q: Do both parts have the same ESR specification?

A: Yes. Both the main part and substitute maintain 40 mOhm ESR at 100 kHz, ensuring equivalent electrical performance in filtering and decoupling applications.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. They share identical moisture sensitivity levels and reliability ratings.

Q: What is the operating temperature range for both parts?

A: Both parts operate across -55°C to 105°C with a lifetime specification of 2000 hours at 105°C.

Q: Can these parts be used interchangeably in automated assembly?

A: Yes. Both parts are packaged in Tape & Reel (TR) format with identical package codes and mounting specifications, allowing seamless integration into surface mount assembly processes.