F320G686MAA Equivalent & Substitute Parts

Part Overview

The F320G686MAA is a 68 µF molded tantalum polymer capacitor rated at 4 V in 1206 (3216 Metric) surface mount package, manufactured by Nichicon. This component is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued system support and new production applications.

Key Parameters

Parameter	Value
Capacitance	68 µF
Voltage Rating	4 V
Package / Case	1206 (3216 Metric)
Type	Molded Tantalum Polymer
Tolerance	±20%
Operating Temperature Range	-55°C ~ 105°C
Mounting Type	Surface Mount
Size / Dimension	0.126" L x 0.063" W (3.20mm x 1.60mm)
Height - Seated (Max)	0.071" (1.80mm)

Substitute Part Grouping Explanation

Substitution of the F320G686MAA is determined by strict equivalence across the following parameters: capacitance value (68 µF), voltage rating (4 V), package type (1206 / 3216 Metric), component type (molded tantalum polymer), tolerance (±20%), operating temperature range (-55°C ~ 105°C), and physical dimensions (0.126" L x 0.063" W, max height 0.071").

Three active substitute parts meet these criteria:

Direct Manufacturer Equivalent: T55A686M004C0500 (Vishay Sprague) — matches all electrical and mechanical parameters with ESR of 500mOhm @ 100kHz.

Similar Manufacturer Equivalent: TCJA686M004R0250 (KYOCERA AVX) — matches all electrical and mechanical parameters with ESR of 250mOhm @ 100kHz and specified lifetime rating.

Parametric Equivalent: T520A686M004ATE1804539 (KEMET) — matches all electrical and mechanical parameters with ESR of 180mOhm @ 100kHz (identical to original) and specified lifetime rating.

Parameter Comparison

Parameter	F320G686MAA (Nichicon)	T55A686M004C0500 (Vishay)	TCJA686M004R0250 (KYOCERA AVX)	T520A686M004ATE1804539 (KEMET)
Capacitance	68 µF	68 µF	68 µF	68 µF
Voltage Rating	4 V	4 V	4 V	4 V
Tolerance	±20%	±20%	±20%	±20%
Type	Molded	Molded	Molded	Molded
ESR @ 100kHz	180mOhm	500mOhm	250mOhm	180mOhm
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Package / Case	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)
Size / Dimension	0.126" L x 0.063" W (3.20mm x 1.60mm)	0.126" L x 0.063" W (3.20mm x 1.60mm)	0.126" L x 0.063" W (3.20mm x 1.60mm)	0.126" L x 0.063" W (3.20mm x 1.60mm)
Height - Seated (Max)	0.071" (1.80mm)	0.071" (1.80mm)	0.071" (1.80mm)	0.071" (1.80mm)
Product Status	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	Not specified

Engineering Selection Recommendations

All three substitute parts are active products with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Selection between substitutes depends on application-specific ESR requirements and moisture handling protocols.

T520A686M004ATE1804539 (KEMET) provides the lowest ESR (180mOhm @ 100kHz), matching the original F320G686MAA specification and offering specified lifetime rating of 2000 Hrs @ 105°C. This part is optimal for applications where ESR performance is critical.

TCJA686M004R0250 (KYOCERA AVX) offers intermediate ESR (250mOhm @ 100kHz) with specified lifetime rating of 2000 Hrs @ 105°C, providing a balance between performance and availability.

T55A686M004C0500 (Vishay Sprague) has higher ESR (500mOhm @ 100kHz) and should be selected only when circuit design tolerates increased ESR or when specific supply chain constraints apply.

All substitutes maintain identical capacitance, voltage rating, package dimensions, and operating temperature range. Moisture sensitivity level differences (MSL 1 vs. MSL 3) require adherence to respective handling and storage protocols during assembly.

Frequently Asked Questions (FAQ)

Q: Can T55A686M004C0500 be used as a direct replacement for F320G686MAA?

A: Yes. The part meets all electrical and mechanical substitution criteria: 68 µF capacitance, 4 V rating, 1206 package, ±20% tolerance, and -55°C ~ 105°C operating range. The higher ESR (500mOhm vs. 180mOhm) must be evaluated against circuit performance requirements.

Q: What is the difference between the three substitute parts?

A: All three maintain identical capacitance, voltage, package, and temperature specifications. The primary differences are ESR values (180mOhm, 250mOhm, and 500mOhm respectively) and moisture sensitivity levels. ESR affects ripple current handling and thermal performance; MSL affects assembly handling requirements.

Q: Are all substitutes RoHS compliant?

A: Yes. T55A686M004C0500, TCJA686M004R0250, and T520A686M004ATE1804539 are all ROHS3 compliant, meeting current regulatory requirements.

Q: Does package compatibility guarantee mechanical fit?

A: Yes. All substitute parts share identical 1206 (3216 Metric) package specifications with matching dimensions (0.126" L x 0.063" W) and maximum seated height (0.071"), ensuring direct PCB footprint compatibility.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences?

A: The original F320G686MAA has MSL 1 (unlimited shelf life without drying). Substitutes with MSL 3 require controlled storage and may require baking before reflow soldering if exposed to moisture. Assembly procedures must account for these handling differences.

Q: Which substitute offers the best performance match to the original?

A: T520A686M004ATE1804539 (KEMET) provides the closest electrical match with identical 180mOhm ESR @ 100kHz and includes specified lifetime rating of 2000 Hrs @ 105°C.

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