08055C391KAJ2A Equivalent & Substitute Parts

Part Overview

The 08055C391KAJ2A is a 390 pF ±10% 50V ceramic capacitor manufactured by KYOCERA AVX with X7R temperature coefficient in 0805 (2012 Metric) surface mount package. This component is classified as Active product status and is suitable for general purpose applications. Equivalent and substitute parts are identified based on matching capacitance, voltage rating, package dimensions, and temperature coefficient specifications. Alternative sources and upgraded variants are available to support design flexibility, inventory optimization, and compliance requirements.

Key Parameters

Parameter	Value
Capacitance	390 pF
Tolerance	±10%
Voltage - Rated	50V
Temperature Coefficient	X7R
Operating Temperature Range	-55°C ~ 125°C
Package / Case	0805 (2012 Metric)
Mounting Type	Surface Mount, MLCC
Size / Dimension	0.079" L x 0.049" W (2.01mm x 1.25mm)
Thickness (Max)	0.037" (0.94mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts are organized into three categories based on substitution criteria:

Upgrade Substitutes - Parts with enhanced specifications (higher voltage rating or improved temperature coefficient) that maintain or exceed the original 390 pF capacitance and 50V minimum voltage requirement. These parts are direct functional upgrades suitable for applications requiring higher reliability or stricter tolerance specifications.

Parametric Equivalents - Parts with identical electrical specifications (390 pF ±10%, 50V, X7R) but different packaging format or manufacturer, maintaining full interchangeability within the same circuit design.

Direct Substitutes - Parts from alternative manufacturers (KEMET, YAGEO) with matching 390 pF ±10% 50V X7R specifications and 0805 package, providing equivalent performance and compatibility.

Key parameters determining substitution validity:

Capacitance value: 390 pF (fixed)
Voltage rating: minimum 50V
Temperature coefficient: X7R or C0G/NP0 (both acceptable for general purpose applications)
Package: 0805 (2012 Metric)
Operating temperature: -55°C ~ 125°C
Mounting type: Surface Mount, MLCC

Parameter Comparison

Manufacturer Part Number	Manufacturer	Capacitance	Tolerance	Voltage	Temp Coeff	Package	RoHS Status	Inventory
08055C391KAJ2A	KYOCERA AVX	390 pF	±10%	50V	X7R	0805	RoHS non-compliant	861 Pcs
08052C391KAT2A	KYOCERA AVX	390 pF	±10%	200V	X7R	0805	ROHS3 Compliant	14108 Pcs
KGM21BCG1H391FT	KYOCERA AVX	390 pF	±1%	50V	C0G/NP0	0805	ROHS3 Compliant	6499 Pcs
KGM21BCG1H391GT	KYOCERA AVX	390 pF	±2%	50V	C0G/NP0	0805	ROHS3 Compliant	2595 Pcs
KGM21BCG1H391KT	KYOCERA AVX	390 pF	±10%	50V	C0G/NP0	0805	ROHS3 Compliant	12231 Pcs
KGM21BCG2A391FT	KYOCERA AVX	390 pF	±1%	100V	C0G/NP0	0805	ROHS3 Compliant	1242 Pcs
KGM21BCG2A391JT	KYOCERA AVX	390 pF	±5%	100V	C0G/NP0	0805	ROHS3 Compliant	23248 Pcs
KGM21ECG2D391JU	KYOCERA AVX	390 pF	±5%	200V	C0G/NP0	0805	ROHS3 Compliant	8517 Pcs
08055C391KAT2A	KYOCERA AVX	390 pF	±10%	50V	X7R	0805	ROHS3 Compliant	7602 Pcs
C0805C391K5RAC7800	KEMET	390 pF	±10%	50V	X7R	0805	ROHS3 Compliant	9267 Pcs
CC0805KRX7R9BB391	YAGEO	390 pF	±10%	50V	X7R	0805	ROHS3 Compliant	3744 Pcs

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: Select 08055C391KAT2A (KYOCERA AVX), C0805C391K5RAC7800 (KEMET), or CC0805KRX7R9BB391 (YAGEO). All three parts maintain identical electrical specifications to the original 08055C391KAJ2A while meeting ROHS3 compliance and REACH unaffected status.

For Enhanced Voltage Margin: 08052C391KAT2A provides 200V rating with X7R temperature coefficient and ROHS3 compliance, suitable for applications requiring higher voltage headroom within the same package footprint.

For Improved Tolerance Specifications: KGM21BCG1H391FT offers ±1% tolerance with C0G/NP0 temperature coefficient at 50V, providing superior capacitance stability for precision circuit applications. KGM21BCG1H391GT provides ±2% tolerance as an intermediate option.

For Higher Voltage with Tighter Tolerance: KGM21BCG2A391FT delivers 100V rating with ±1% tolerance and C0G/NP0 coefficient. KGM21ECG2D391JU extends to 200V with ±5% tolerance, both with ROHS3 compliance.

For Inventory Availability: KGM21BCG2A391JT (23248 Pcs) and 08052C391KAT2A (14108 Pcs) offer highest stock levels with ROHS3 compliance and enhanced specifications.

Frequently Asked Questions (FAQ)

Q: Can I use a higher voltage rated capacitor as a direct substitute? A: Yes. A capacitor rated for higher voltage (e.g., 200V instead of 50V) is a valid substitute provided all other parameters match: capacitance (390 pF), tolerance, temperature coefficient, package (0805), and operating temperature range (-55°C ~ 125°C). Higher voltage rating provides additional safety margin without affecting circuit performance.

Q: What is the difference between X7R and C0G/NP0 temperature coefficients? A: X7R exhibits ±15% capacitance change across the operating temperature range (-55°C ~ 125°C), suitable for general purpose applications. C0G/NP0 provides superior stability with minimal capacitance drift across temperature, preferred for precision circuits. Both are acceptable substitutes for the original part depending on application requirements.

Q: Are KEMET and YAGEO parts fully compatible with KYOCERA AVX originals? A: Yes. C0805C391K5RAC7800 (KEMET) and CC0805KRX7R9BB391 (YAGEO) are direct substitutes with identical electrical specifications (390 pF ±10%, 50V, X7R), 0805 package dimensions, and operating temperature range. All three manufacturers meet ROHS3 compliance and REACH unaffected status.

Q: Does tolerance affect substitution compatibility? A: Tolerance affects circuit precision but not mechanical or electrical compatibility. The original part specifies ±10% tolerance. Substitutes with tighter tolerance (±1%, ±2%, ±5%) are fully compatible and provide improved capacitance accuracy. Substitutes with looser tolerance are not available in this product line.

Q: What is the significance of MSL (Moisture Sensitivity Level) 1? A: MSL 1 indicates unlimited shelf life without moisture baking requirements. All listed substitutes maintain MSL 1 rating, ensuring identical moisture handling and storage requirements.

Q: Can I substitute the 08055C391KAJ2A with a part in different packaging format? A: All listed substitutes maintain the 0805 (2012 Metric) package specification. Packaging format (Tape & Reel vs. bulk) does not affect electrical or mechanical compatibility; it only impacts procurement and handling logistics.

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