TAJC685M020SNJ Equivalent & Substitute Parts

Part Overview

The TAJC685M020SNJ is a 6.8 µF molded tantalum capacitor manufactured by KYOCERA AVX, rated for 20 V with ±20% tolerance in a 2312 (6032 Metric) surface mount package. This component is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified based on matching or superior electrical and mechanical parameters within the same package footprint and operating specifications.

Key Parameters

Parameter	Value
Capacitance	6.8 µF
Voltage Rating	20 V
Tolerance	±20%
Package / Case	2312 (6032 Metric)
ESR (Equivalent Series Resistance)	2 Ohm
Operating Temperature Range	-55°C to 125°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TAJC685M020SNJ is determined by the following criteria:

Direct Equivalents maintain identical capacitance (6.8 µF), voltage rating (20 V), tolerance (±20%), and package (2312). These parts are functionally interchangeable with no circuit redesign required.

Tolerance Upgrades improve tolerance from ±20% to ±10% while maintaining 20 V rating and 2312 package. These provide tighter capacitance accuracy without changing electrical performance.

Voltage Upgrades increase rated voltage from 20 V to 25 V while maintaining 6.8 µF capacitance and 2312 package. These provide additional voltage margin in the same physical footprint.

Manufacturer Alternatives from KEMET and Vishay Sprague meet identical electrical specifications (6.8 µF, 20 V, 2312 package) with equivalent or superior ESR characteristics (1.9 Ohm vs. 2 Ohm).

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	ESR	Package	RoHS Status	Inventory
TAJC685M020SNJ	KYOCERA AVX	6.8 µF	20 V	±20%	2 Ohm	2312	ROHS3	831 Pcs
TAJC685K020RNJ	KYOCERA AVX	6.8 µF	20 V	±10%	2 Ohm	2312	ROHS3	1273 Pcs
TAJC685K025RNJ	KYOCERA AVX	6.8 µF	25 V	±10%	2 Ohm	2312	ROHS3	2712 Pcs
T491C685M020AT	KEMET	6.8 µF	20 V	±20%	1.9 Ohm	2312	ROHS3	2100 Pcs
293D685X9020C2TE3	Vishay Sprague	6.8 µF	20 V	±10%	1.9 Ohm	2312	ROHS3	1540 Pcs
T491C685K020AT	KEMET	6.8 µF	20 V	±10%	1.9 Ohm	2312	ROHS3	3933 Pcs
T491C685K025AH	KEMET	6.8 µF	25 V	±10%	1.9 Ohm	2312	RoHS non-compliant	1526 Pcs
T491C685K025AT	KEMET	6.8 µF	25 V	±10%	1.9 Ohm	2312	ROHS3	2814 Pcs
T491C685M025AT	KEMET	6.8 µF	25 V	±20%	1.9 Ohm	2312	ROHS3	1141 Pcs

Engineering Selection Recommendations

For Direct Replacement (No Circuit Changes): T491C685M020AT (KEMET) provides identical electrical specifications with superior ESR (1.9 Ohm vs. 2 Ohm) and ROHS3 compliance. This part is the preferred direct equivalent.

For Improved Tolerance Accuracy: T491C685K020AT (KEMET) or TAJC685K020RNJ (KYOCERA AVX) upgrade tolerance to ±10% while maintaining 20 V rating and 2312 package. Both are ROHS3 compliant with higher inventory availability.

For Increased Voltage Margin: T491C685K025AT (KEMET) or TAJC685K025RNJ (KYOCERA AVX) provide 25 V rating with ±10% tolerance in the same package. These are suitable for applications requiring additional voltage headroom. Both are ROHS3 compliant.

Compliance Consideration: T491C685K025AH (KEMET) is RoHS non-compliant and should be avoided in applications requiring ROHS3 certification.

Frequently Asked Questions (FAQ)

Q: Can I use a 25 V rated capacitor in place of a 20 V rated capacitor? A: Yes. A higher voltage rating provides additional safety margin and is electrically compatible. The 25 V parts (TAJC685K025RNJ, T491C685K025AT, T491C685K025AH, T491C685M025AT) are direct substitutes for 20 V applications.

Q: What is the difference between ±20% and ±10% tolerance? A: Tolerance specifies the allowable deviation from the nominal 6.8 µF value. ±20% allows 5.44 µF to 8.16 µF; ±10% allows 6.12 µF to 7.48 µF. Applications requiring tighter capacitance accuracy should use ±10% parts.

Q: Are KEMET and Vishay Sprague parts pin-compatible with KYOCERA AVX? A: Yes. All substitute parts share the identical 2312 (6032 Metric) package footprint and surface mount configuration. No PCB layout changes are required.

Q: What does ESR mean and why does it matter? A: ESR (Equivalent Series Resistance) represents internal resistance. Lower ESR (1.9 Ohm) provides better high-frequency performance and lower heat generation compared to 2 Ohm. KEMET and Vishay parts offer superior ESR characteristics.

Q: Is RoHS compliance required for my application? A: ROHS3 compliance is mandatory for most commercial and industrial applications. T491C685K025AH is RoHS non-compliant and should only be used in applications explicitly allowing non-compliant components.

Q: What is MSL (Moisture Sensitivity Level)? A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed parts carry MSL 1 rating.

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