KEMET T520B686M004ASE070 Equivalent & Substitute Parts

Part Overview

The KEMET T520B686M004ASE070 is a 68 µF molded tantalum polymer capacitor rated at 4 V with 70 mOhm equivalent series resistance (ESR) at 100 kHz. This component is packaged in the 1411 (3528 Metric) surface mount case and operates across the temperature range of -55°C to 105°C with a 2000-hour lifetime rating at 105°C.

The T520B686M004ASE070 carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Substitute parts must maintain electrical compatibility across capacitance, voltage rating, ESR characteristics, and mechanical form factor specifications.

Substiute Parts

T520B686M004ASE070

KEMETIn Stock: 870T520B686M004ASE070 Datasheet

Current PartRFQ

T520B686M004ATE070

KEMETIn Stock: 1082T520B686M004ATE070 Datasheet

DirectRFQ

T520B686M006ATE070

KEMETIn Stock: 2473T520B686M006ATE070 Datasheet

UpgradeRFQ

T520T686M006ATE070

KEMETIn Stock: 1380T520T686M006ATE070 Datasheet

UpgradeRFQ

T520B686M004ATE025

KEMETIn Stock: 1119T520B686M004ATE025 Datasheet

SimilarRFQ

T520B686M004ATE040

KEMETIn Stock: 1006T520B686M004ATE040 Datasheet

SimilarRFQ

T55B686M004C0070

Vishay SpragueIn Stock: 742T55B686M004C0070 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the T520B686M004ASE070 are classified based on the following substitution criteria:

Direct Equivalents maintain all critical electrical parameters: 68 µF capacitance, 4 V voltage rating, 70 mOhm ESR at 100 kHz, and identical 1411 (3528 Metric) package dimensions. These parts differ only in packaging format (Tape & Reel versus bulk) or manufacturer identity while preserving functional performance.

Voltage-Upgraded Substitutes increase the rated voltage from 4 V to 6.3 V while maintaining 68 µF capacitance, 70 mOhm ESR, and package form factor. These parts provide enhanced voltage margin and are mechanically and electrically compatible with the original design when voltage headroom permits.

ESR-Optimized Substitutes reduce ESR from 70 mOhm to 25 mOhm or 40 mOhm at 100 kHz while preserving 68 µF capacitance, 4 V voltage rating, and package dimensions. These variants offer improved high-frequency performance characteristics.

Cross-Manufacturer Equivalents from Vishay Sprague maintain identical electrical specifications (68 µF, 4 V, 70 mOhm ESR) and package form factor, providing alternative sourcing from different manufacturers within the same product category.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Active Status Required): The T520B686M004ATE070 is the primary direct substitute. This part maintains identical electrical specifications (68 µF, 4 V, 70 mOhm ESR) and mechanical form factor while transitioning from Obsolete to Active product status. The packaging format change from bulk to Tape & Reel reflects current manufacturing standards and improves supply chain availability.

For Voltage-Margin Applications: The T520B686M006ATE070 provides a voltage-upgraded alternative with 6.3 V rating while preserving all other electrical parameters. This substitution is valid when circuit design permits higher voltage-rated components and when enhanced voltage headroom is beneficial. The T520T686M006ATE070 offers the same electrical performance with reduced seated height (1.20 mm versus 2.00 mm), accommodating space-constrained designs.

For ESR-Sensitive Applications: The T520B686M004ATE025 and T520B686M004ATE040 reduce ESR to 25 mOhm and 40 mOhm respectively, maintaining 4 V voltage rating and 68 µF capacitance. These variants are suitable for applications requiring lower impedance at 100 kHz. Selection depends on specific ESR requirements within the 4 V operating envelope.

For Cross-Manufacturer Sourcing: The Vishay Sprague T55B686M004C0070 provides equivalent electrical performance (68 µF, 4 V, 70 mOhm ESR) with Active product status. This part supports dual-source strategies and mitigates single-manufacturer supply risk. Seated height is 2.10 mm, within acceptable tolerance for standard 1411 package specifications.

All recommended substitutes maintain ROHS3 compliance, MSL 3 (168 Hours) rating, and surface mount compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can T520B686M004ATE070 directly replace T520B686M004ASE070 in production?

A: Yes. The T520B686M004ATE070 is a direct electrical and mechanical equivalent with identical capacitance (68 µF), voltage rating (4 V), ESR (70 mOhm @ 100 kHz), and package form factor (1411/3528 Metric). The primary difference is packaging format (Tape & Reel versus bulk) and Active product status. No circuit redesign is required.

Q: What is the difference between T520B686M004ATE070 and T520B686M006ATE070?

A: The voltage rating increases from 4 V to 6.3 V. All other parameters remain constant: 68 µF capacitance, 70 mOhm ESR at 100 kHz, and 1411 (3528 Metric) package. The 6.3 V variant is suitable for designs where higher voltage margin is acceptable or required.

Q: Can I use T520B686M004ATE025 as a substitute for the original part?

A: Yes, with the caveat that ESR is reduced to 25 mOhm at 100 kHz compared to the original 70 mOhm specification. Capacitance (68 µF), voltage rating (4 V), and package dimensions remain identical. Lower ESR improves high-frequency performance and is generally compatible with designs specified for the original part.

Q: What is the height difference between T520B686M006ATE070 and T520T686M006ATE070?

A: T520B686M006ATE070 has a seated height of 2.00 mm, while T520T686M006ATE070 has a seated height of 1.20 mm. Both maintain 68 µF capacitance, 6.3 V voltage rating, and 70 mOhm ESR. The reduced-height variant accommodates space-constrained PCB layouts.

Q: Is the Vishay Sprague T55B686M004C0070 compatible with the KEMET original?

A: Yes. The T55B686M004C0070 maintains identical electrical specifications (68 µF, 4 V, 70 mOhm ESR) and 1411 (3528 Metric) package form factor. Seated height is 2.10 mm, within standard tolerance for this package class. Cross-manufacturer substitution is valid for supply diversification.

Q: What does MSL 3 (168 Hours) mean for component handling?

A: MSL 3 indicates Moisture Sensitivity Level 3, requiring storage in controlled humidity environments. The 168-hour specification means the component can be exposed to ambient conditions (up to 30°C, 60% relative humidity) for a maximum of 168 hours before soldering. Proper moisture management during storage and assembly is required.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant certification, meeting European Union Restriction of Hazardous Substances Directive requirements. No hazardous substance restrictions apply to component selection among these alternatives.