F310J686MBA Equivalent & Substitute Parts

Part Overview

The Nichicon F310J686MBA is a 68 µF molded tantalum polymer capacitor rated at 6.3 V with 70 mOhm ESR @ 100 kHz in a 1411 (3528 Metric) surface mount package. This component is classified as obsolete, making identification of equivalent and substitute parts essential for design continuity and procurement planning. Active alternatives from current manufacturers provide functional equivalence while maintaining the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Capacitance	68 µF
Voltage Rating	6.3 V
ESR @ 100 kHz	70 mOhm
Package / Case	1411 (3528 Metric)
Type	Molded Tantalum Polymer
Tolerance	±20%
Operating Temperature Range	-55°C ~ 105°C
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

Capacitance: 68 µF (exact match required)
Voltage Rating: 6.3 V (exact match required)
ESR @ 100 kHz: 70 mOhm (exact match required)
Package / Case: 1411 (3528 Metric) (exact match required)
Type: Molded Tantalum Polymer (exact match required)
Tolerance: ±20% (exact match required)

Direct Equivalents (all parameters match exactly):

T520T686M006ATE070 (KEMET)
T55T686M6R3C0070 (Vishay Sprague)

Similar Substitute (differs in ESR specification):

T520B686M006ATE025 (KEMET) — 25 mOhm ESR @ 100 kHz instead of 70 mOhm

Package Variant (differs in package height):

TCJB686M006R0070 (KYOCERA AVX) — 1210 (3528 Metric) package with 2.10 mm seated height vs. 1.20 mm

Parameter Comparison

Parameter	F310J686MBA (Nichicon)	T520T686M006ATE070 (KEMET)	T55T686M6R3C0070 (Vishay Sprague)	TCJB686M006R0070 (KYOCERA AVX)	T520B686M006ATE025 (KEMET)
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
ESR @ 100 kHz	70 mOhm	70 mOhm	70 mOhm	70 mOhm	25 mOhm
Package / Case	1411 (3528 Metric)	1411 (3528 Metric)	1411 (3528 Metric)	1210 (3528 Metric)	1411 (3528 Metric)
Type	Molded	Molded	Molded	Molded	Molded
Tolerance	±20%	±20%	±20%	±20%	±20%
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 105°C
Lifetime @ Temp.	—	2000 Hrs @ 105°C	—	2000 Hrs @ 125°C	2000 Hrs @ 105°C
Height - Seated (Max)	0.047" (1.20 mm)	0.047" (1.20 mm)	0.047" (1.20 mm)	0.083" (2.10 mm)	0.079" (2.00 mm)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

For Direct Replacement (Preferred): T520T686M006ATE070 (KEMET) and T55T686M6R3C0070 (Vishay Sprague) are fully equivalent alternatives. Both are active products with ROHS3 compliance and documented lifetime ratings. KEMET's T520T686M006ATE070 offers 2000 hours @ 105°C reliability data. Vishay's T55T686M6R3C0070 provides equivalent performance with vPolyTan™ series technology.

For Lower ESR Applications: T520B686M006ATE025 (KEMET) provides 25 mOhm ESR instead of 70 mOhm, suitable for applications requiring reduced impedance. This part maintains all other electrical specifications and is ROHS3 compliant with 2000 hours @ 105°C lifetime rating. Physical height increases to 2.00 mm (vs. 1.20 mm), requiring PCB layout verification.

For Extended Temperature Range: TCJB686M006R0070 (KYOCERA AVX) extends operating temperature to 125°C with 2000 hours @ 125°C lifetime rating. Package height increases to 2.10 mm due to 1210 case variant. This option is suitable only if PCB clearance permits the additional height and if extended temperature performance is required.

Compliance Considerations: All active substitutes are ROHS3 compliant and REACH unaffected. The original F310J686MBA carries MSL 1 (unlimited moisture sensitivity), while all substitutes are MSL 3 (168 hours). Procurement and storage procedures must account for the stricter moisture sensitivity level of replacement parts.

Frequently Asked Questions (FAQ)

Q: Can T520T686M006ATE070 directly replace F310J686MBA? A: Yes. T520T686M006ATE070 matches all critical electrical parameters: 68 µF capacitance, 6.3 V rating, 70 mOhm ESR @ 100 kHz, and 1411 package. Physical dimensions and height are equivalent. KEMET's active product status ensures long-term availability.

Q: What is the difference between the direct equivalents and T520B686M006ATE025? A: T520B686M006ATE025 has lower ESR (25 mOhm vs. 70 mOhm), reducing impedance in high-frequency applications. Seated height increases to 2.00 mm. Use this variant only if lower ESR is required and PCB layout accommodates the increased height.

Q: Why does TCJB686M006R0070 have a different package designation (1210 vs. 1411)? A: Both 1210 and 1411 refer to the same 3528 Metric footprint dimensions (4.60 mm × 2.80 mm). The difference is seated height: TCJB686M006R0070 is 2.10 mm tall vs. 1.20 mm for the original. This variant is suitable only if vertical clearance permits and extended temperature performance (-55°C to 125°C) is required.

Q: What is the impact of MSL 3 (168 hours) vs. MSL 1 (unlimited)? A: MSL 3 requires controlled storage and handling within 168 hours of package opening at specified humidity levels. MSL 1 has no moisture sensitivity restrictions. Procurement must implement proper moisture control procedures for all active substitutes.

Q: Are all substitutes ROHS3 compliant? A: Yes. T520T686M006ATE070, T55T686M6R3C0070, TCJB686M006R0070, and T520B686M006ATE025 are all ROHS3 compliant and REACH unaffected, matching regulatory requirements of the original part.

Q: Which substitute offers the best reliability data? A: Both T520T686M006ATE070 (KEMET) and TCJB686M006R0070 (KYOCERA AVX) provide 2000 hours @ rated temperature lifetime ratings. TCJB686M006R0070 extends this to 125°C operation. T520T686M006ATE070 is rated at 105°C, matching the original operating range.

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