F320J686MBA Equivalent & Substitute Parts

Part Overview

The F320J686MBA is a 68 µF molded tantalum polymer capacitor rated at 6.3 V, manufactured by Nichicon in the 1411 (3528 Metric) package. This component is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional alternatives within the allowed parameter ranges for this capacitor category.

Key Parameters

Parameter	F320J686MBA
Capacitance	68 µF
Voltage Rating	6.3 V
Type	Molded Tantalum Polymer
Package / Case	1411 (3528 Metric)
ESR @ 100kHz	70 mOhm
Operating Temperature Range	-55°C to 105°C
Mounting Type	Surface Mount
Tolerance	±20%
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the F320J686MBA is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters (Must Match):

Capacitance: 68 µF
Voltage Rating: 6.3 V
Package / Case: 1411 (3528 Metric)
Mounting Type: Surface Mount
Type: Molded Tantalum Polymer
Tolerance: ±20%

Allowable Variation Parameters:

ESR @ 100kHz: 70 mOhm (baseline); lower values acceptable
Operating Temperature Range: -55°C to 105°C (baseline); extended ranges acceptable
Height - Seated: Physical height variation permitted within package constraints
Manufacturer Size Code: Variation permitted (B, B2, T designations)

Substitute parts are grouped into two categories: Direct Manufacturer Substitutes (active status, identical specifications) and Parametric Equivalents (active status, matching critical parameters with allowable variations).

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Package	ESR @ 100kHz	Operating Temp	Height (Max)	Product Status	RoHS Status
F320J686MBA	Nichicon	68 µF	6.3 V	1411	70 mOhm	-55°C to 105°C	0.083" (2.10 mm)	Obsolete	N/A
6TPB68M	Panasonic	68 µF	6.3 V	1411	70 mOhm	-55°C to 105°C	0.079" (2.00 mm)	Active	ROHS3 Compliant
T520B686M006ATE025	KEMET	68 µF	6.3 V	1411	25 mOhm	-55°C to 105°C	0.079" (2.00 mm)	Active	ROHS3 Compliant
T520B686M006ATE070	KEMET	68 µF	6.3 V	1411	70 mOhm	-55°C to 105°C	0.079" (2.00 mm)	Active	ROHS3 Compliant
T520T686M006ATE070	KEMET	68 µF	6.3 V	1411	70 mOhm	-55°C to 105°C	0.047" (1.20 mm)	Active	ROHS3 Compliant
T55T686M6R3C0070	Vishay Sprague	68 µF	6.3 V	1411	70 mOhm	-55°C to 105°C	0.047" (1.20 mm)	Active	ROHS3 Compliant
TCJB686M006R0055	KYOCERA AVX	68 µF	6.3 V	1210	55 mOhm	-55°C to 125°C	0.083" (2.10 mm)	Active	ROHS3 Compliant
6TAB68M	Panasonic	68 µF	6.3 V	1411	70 mOhm	-55°C to 105°C	0.083" (2.10 mm)	Active	ROHS3 Compliant
T55B686M6R3C0070	Vishay Sprague	68 µF	6.3 V	1411	70 mOhm	-55°C to 105°C	0.083" (2.10 mm)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Manufacturer Substitutes (Highest Compatibility):

6TPB68M (Panasonic POSCAP™ TPB), T520B686M006ATE070 (KEMET KO-CAP® T520), and T55B686M6R3C0070 (Vishay Sprague vPolyTan™ T55) are direct substitutes with identical electrical specifications and 1411 package footprint. All three are active products with ROHS3 compliance. The primary difference is reduced height (0.079" to 0.083"), which is compatible with standard PCB layouts. These parts are recommended for direct replacement without design modification.

Parametric Equivalents (Functional Alternatives):

6TAB68M (Panasonic POSCAP™ TA) matches all critical parameters with identical height to the original part. T520B686M006ATE025 (KEMET) offers superior ESR performance at 25 mOhm, beneficial for high-frequency applications, though height is reduced. T520T686M006ATE070 and T55T686M6R3C0070 provide compact form factors (0.047" height) while maintaining electrical specifications, suitable for space-constrained designs.

Package Consideration:

TCJB686M006R0055 (KYOCERA AVX TCJ series) operates at extended temperature range (-55°C to 125°C) with lower ESR (55 mOhm) but uses 1210 package designation. Verify PCB footprint compatibility before selection, as package dimensions differ from 1411 standard.

Compliance Status:

All active substitute parts carry ROHS3 compliance certification. The original F320J686MBA is obsolete; selection of any active substitute ensures continued compliance with current regulatory requirements and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can I use T520B686M006ATE025 as a direct replacement for F320J686MBA?

A: Yes. The T520B686M006ATE025 maintains identical capacitance (68 µF), voltage rating (6.3 V), package (1411), and operating temperature range (-55°C to 105°C). The lower ESR (25 mOhm versus 70 mOhm) is an improvement that does not compromise compatibility. Height is reduced from 0.083" to 0.079", which is acceptable for standard PCB layouts.

Q: What is the difference between 1411 and 1210 package designations?

A: Both designations refer to the same 3528 Metric footprint dimensions (0.138" L × 0.110" W). The package designation difference reflects manufacturer coding conventions. TCJB686M006R0055 uses 1210 designation but maintains identical footprint compatibility with 1411-designated parts.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed (6TPB68M, T520B686M006ATE series, T55 series, TCJB686M006R0055, and 6TAB68M) carry ROHS3 compliance certification. The original F320J686MBA does not specify RoHS status due to obsolete classification.

Q: Which substitute offers the best ESR performance?

A: T520B686M006ATE025 provides the lowest ESR at 25 mOhm @ 100kHz, compared to 70 mOhm for the original part. This reduces impedance in high-frequency applications and improves transient response characteristics.

Q: Can I use the compact height versions (T520T686M006ATE070, T55T686M6R3C0070) without PCB redesign?

A: Yes. The reduced height (0.047" versus 0.083") is compatible with standard PCB layouts and does not require design modification. Verify clearance with adjacent components and confirm solder reflow profile compatibility with your manufacturing process.

Q: What is the operating temperature difference between F320J686MBA and TCJB686M006R0055?

A: The original part operates -55°C to 105°C. TCJB686M006R0055 extends the upper limit to 125°C, providing enhanced thermal margin. This is an improvement and does not restrict compatibility in applications requiring the original temperature range.

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