T520B686M006ATE025 Equivalent & Substitute Parts

Part Overview

The T520B686M006ATE025 is a 68 µF molded tantalum polymer capacitor manufactured by KEMET, rated for 6.3 V operation. This surface mount component belongs to the KO-CAP® T520 series and is housed in a 1411 (3528 Metric) package. The part is Active in product status and ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design flexibility, or application-specific performance parameters.

Key Parameters

Parameter	Value
Capacitance	68 µF
Voltage Rating	6.3 V
Type	Molded Tantalum Polymer
Package / Case	1411 (3528 Metric)
Mounting Type	Surface Mount
ESR @ 100kHz	25 mOhm
Operating Temperature Range	-55°C to 105°C
Tolerance	±20%
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the T520B686M006ATE025 is determined by the following criteria:

Electrical Parameters (Must Match):

Capacitance: 68 µF
Voltage Rating: 6.3 V
Tolerance: ±20%
Operating Temperature Range: -55°C to 105°C

Mechanical Parameters (Must Match):

Package / Case: 1411 (3528 Metric)
Mounting Type: Surface Mount
Footprint Dimensions: 0.138" L x 0.110" W (3.50 mm x 2.80 mm)

Performance Parameters (Variable):

ESR @ 100kHz: Acceptable range 25 mOhm to 70 mOhm
Height - Seated (Max): Acceptable range 0.047" to 0.083" (1.20 mm to 2.10 mm)
Manufacturer Size Code: B or T

Compliance Parameters (Must Match):

RoHS Status: ROHS3 Compliant
MSL Rating: 3 (168 Hours)
REACH Status: REACH Unaffected

Substitute parts maintain identical electrical specifications and footprint compatibility while allowing variation in ESR performance and physical height within the 1411 package envelope.

Parameter Comparison

Parameter	T520B686M006ATE025 (Main)	T520B686M006ATE040	T520B686M006ATE070	T520T686M006ATE070	T55B686M6R3C0070
Manufacturer	KEMET	KEMET	KEMET	KEMET	Vishay Sprague
Capacitance	68 µF	68 µF	68 µF	68 µF	68 µF
Voltage Rating	6.3 V	6.3 V	6.3 V	6.3 V	6.3 V
Tolerance	±20%	±20%	±20%	±20%	±20%
Type	Molded	Molded	Molded	Molded	Molded
ESR @ 100kHz	25 mOhm	40 mOhm	70 mOhm	70 mOhm	70 mOhm
Operating Temperature	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C
Lifetime @ Temp.	2000 Hrs @ 105°C	2000 Hrs @ 105°C	2000 Hrs @ 105°C	2000 Hrs @ 105°C	Not Specified
Package / Case	1411 (3528 Metric)	1411 (3528 Metric)	1411 (3528 Metric)	1411 (3528 Metric)	1411 (3528 Metric)
Size / Dimension	0.138" L x 0.110" W (3.50 mm x 2.80 mm)	0.138" L x 0.110" W (3.50 mm x 2.80 mm)	0.138" L x 0.110" W (3.50 mm x 2.80 mm)	0.138" L x 0.110" W (3.50 mm x 2.80 mm)	0.138" L x 0.110" W (3.50 mm x 2.80 mm)
Height - Seated (Max)	0.079" (2.00 mm)	0.079" (2.00 mm)	0.079" (2.00 mm)	0.047" (1.20 mm)	0.083" (2.10 mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and full ROHS3 compliance with REACH Unaffected designation, ensuring regulatory continuity with the primary part T520B686M006ATE025.

KEMET KO-CAP® T520 Series Substitutes:

T520B686M006ATE040 and T520B686M006ATE070 are direct KEMET alternatives within the same T520B base product line. These parts share identical electrical specifications, package geometry, and mounting characteristics. The primary difference is ESR performance: T520B686M006ATE040 operates at 40 mOhm while T520B686M006ATE070 operates at 70 mOhm, compared to the main part's 25 mOhm. All three maintain 2000 Hrs @ 105°C lifetime rating.

T520T686M006ATE070 is a KEMET variant using the T520T base product number with reduced height (0.047" vs. 0.079"), suitable for applications with vertical space constraints. This part operates at 70 mOhm ESR and maintains all other electrical and compliance specifications.

Vishay Sprague vPolyTan™ T55 Series Substitute:

T55B686M6R3C0070 is a cross-manufacturer alternative from Vishay Sprague. This part maintains identical capacitance, voltage rating, tolerance, operating temperature range, package dimensions, and compliance certifications. The ESR specification is 70 mOhm, and the seated height is 0.083" (2.10 mm). Lifetime specification is not provided for this part.

All substitute parts are suitable for direct PCB footprint replacement with the T520B686M006ATE025 in 1411 (3528 Metric) package applications.

Frequently Asked Questions (FAQ)

Q: Can T520B686M006ATE040 replace T520B686M006ATE025 in my circuit?

A: Yes. Both parts share identical capacitance (68 µF), voltage rating (6.3 V), tolerance (±20%), operating temperature range (-55°C to 105°C), package (1411 / 3528 Metric), and mounting type (Surface Mount). The ESR difference (40 mOhm vs. 25 mOhm) is within acceptable variation for general purpose tantalum polymer capacitor applications. Both are KEMET KO-CAP® T520 series parts with ROHS3 compliance and 2000 Hrs @ 105°C lifetime rating.

Q: What is the difference between T520B686M006ATE070 and T520T686M006ATE070?

A: Both parts are KEMET 68 µF, 6.3 V tantalum polymer capacitors with 70 mOhm ESR and identical electrical specifications. The primary difference is physical height: T520B (size code B) has a maximum seated height of 0.079" (2.00 mm), while T520T (size code T) has a maximum seated height of 0.047" (1.20 mm). The T520T variant is suitable for applications requiring reduced vertical profile within the 1411 package envelope.

Q: Is the Vishay Sprague T55B686M6R3C0070 compatible with my KEMET-specified design?

A: Yes. The T55B686M6R3C0070 maintains identical capacitance, voltage rating, tolerance, operating temperature range, package dimensions (1411 / 3528 Metric), and mounting type. Both manufacturers' parts are ROHS3 compliant with MSL 3 (168 Hours) rating and REACH Unaffected status. The ESR specification is 70 mOhm. The seated height is 0.083" (2.10 mm), which is within the 1411 package specification envelope. Cross-manufacturer substitution is mechanically and electrically compatible.

Q: Why does T520B686M006ATE025 have lower ESR than the substitute parts?

A: ESR variation within the same capacitance and voltage rating reflects different internal construction and performance optimization by the manufacturer. The T520B686M006ATE025 at 25 mOhm represents a lower-ESR variant, while T520B686M006ATE040 (40 mOhm) and T520B686M006ATE070 (70 mOhm) represent higher-ESR variants. All are valid 68 µF, 6.3 V tantalum polymer capacitors in the 1411 package. Selection depends on circuit requirements for impedance and ripple current handling.

Q: Can I use T520T686M006ATE070 if my PCB has limited vertical clearance?

A: Yes. The T520T686M006ATE070 is specifically designed for space-constrained applications with a maximum seated height of 0.047" (1.20 mm), compared to 0.079" (2.00 mm) for the standard T520B variant. All other electrical specifications, package footprint dimensions, and compliance certifications remain identical. Verify that your PCB assembly process and reflow profile are compatible with the reduced-height component.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts listed are supplied in Tape & Reel (TR) packaging format, matching the primary part T520B686M006ATE025. This ensures compatibility with automated assembly equipment and standard component handling procedures.

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