08055C121MAT2A Equivalent & Substitute Parts

Part Overview

The 08055C121MAT2A is a 120 pF ceramic capacitor manufactured by KYOCERA AVX with X7R temperature coefficient, rated for 50V operation. This surface mount multilayer ceramic capacitor (MLCC) in 0805 (2012 Metric) package is designed for general purpose applications requiring stable capacitance across the operating temperature range of -55°C to 125°C. The part is active, ROHS3 compliant, and carries MSL 1 (Unlimited) moisture sensitivity rating. Substitute parts are identified to address specific application requirements including improved tolerance grades, higher voltage ratings, and alternative temperature coefficient specifications while maintaining the same 120 pF capacitance value and 0805 package footprint.

Key Parameters

Parameter	Value
Capacitance	120 pF
Tolerance	±20%
Voltage Rating	50V
Temperature Coefficient	X7R
Operating Temperature Range	-55°C to 125°C
Package / Case	0805 (2012 Metric)
Mounting Type	Surface Mount, MLCC
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 08055C121MAT2A is determined by the following critical parameters: capacitance value (120 pF), package type (0805), mounting method (surface mount), and compliance certifications (ROHS3, REACH Unaffected). Substitute parts maintain these core specifications while offering variations in tolerance grade, voltage rating, and temperature coefficient.

The substitute parts are grouped into three categories:

Category 1: Same Voltage (50V), Improved Tolerance 08055C121KAT2A offers ±10% tolerance with identical 50V rating and X7R temperature coefficient, providing tighter capacitance control within the same voltage specification.

Category 2: Same Voltage (50V), C0G/NP0 Temperature Coefficient KGM21BCG1H121FT and KGM21BCG1H121KT provide C0G/NP0 temperature coefficient with 50V rating, offering superior temperature stability compared to X7R, with tolerance options of ±1% and ±10% respectively.

Category 3: Higher Voltage Ratings (100V and 200V), C0G/NP0 Temperature Coefficient KGM21BCG2A121FT, KGM21BCG2A121GT, KGM21BCG2A121JT, KGM21BCG2A121KT, KGM21BCG2D121JT, and KGM21BCG2D121KT provide elevated voltage ratings (100V or 200V) with C0G/NP0 temperature coefficient and various tolerance grades (±1%, ±2%, ±5%, ±10%).

Category 4: Alternative Manufacturer, Same Voltage (50V), C0G/NP0 Temperature Coefficient C0805C121F5GAC7800 from KEMET provides 50V rating with C0G/NP0 temperature coefficient and ±1% tolerance, offering cross-manufacturer compatibility.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Tolerance	Voltage Rating	Temperature Coefficient	Package	RoHS Status	Inventory (Pcs)
08055C121MAT2A	KYOCERA AVX	120 pF	±20%	50V	X7R	0805	ROHS3	819
08055C121KAT2A	KYOCERA AVX	120 pF	±10%	50V	X7R	0805	ROHS3	14917
KGM21BCG1H121FT	KYOCERA AVX	120 pF	±1%	50V	C0G/NP0	0805	ROHS3	8701
KGM21BCG1H121KT	KYOCERA AVX	120 pF	±10%	50V	C0G/NP0	0805	ROHS3	18941
KGM21BCG2A121FT	KYOCERA AVX	120 pF	±1%	100V	C0G/NP0	0805	ROHS3	29749
KGM21BCG2A121GT	KYOCERA AVX	120 pF	±2%	100V	C0G/NP0	0805	ROHS3	10561
KGM21BCG2A121JT	KYOCERA AVX	120 pF	±5%	100V	C0G/NP0	0805	ROHS3	17592
KGM21BCG2A121KT	KYOCERA AVX	120 pF	±10%	100V	C0G/NP0	0805	ROHS3	2785
KGM21BCG2D121JT	KYOCERA AVX	120 pF	±5%	200V	C0G/NP0	0805	ROHS3	8849
KGM21BCG2D121KT	KYOCERA AVX	120 pF	±10%	200V	C0G/NP0	0805	ROHS3	6929
C0805C121F5GAC7800	KEMET	120 pF	±1%	50V	C0G/NP0	0805	ROHS3	13276

Engineering Selection Recommendations

Selection of substitute parts for the 08055C121MAT2A is based on application voltage requirements, tolerance specifications, and temperature stability needs.

For applications requiring the original 50V rating with improved tolerance control, 08055C121KAT2A provides ±10% tolerance while maintaining X7R temperature coefficient and identical voltage specification. This part is suitable for general purpose circuits where tighter capacitance accuracy is beneficial.

For circuits requiring superior temperature stability, KGM21BCG1H121FT and KGM21BCG1H121KT offer C0G/NP0 temperature coefficient at 50V rating. KGM21BCG1H121FT provides ±1% tolerance for precision applications, while KGM21BCG1H121KT offers ±10% tolerance for standard applications. C0G/NP0 temperature coefficient ensures minimal capacitance variation across the full operating temperature range.

For applications with voltage headroom requirements exceeding 50V, the KGM21BCG2A series provides 100V rating with C0G/NP0 temperature coefficient and tolerance options from ±1% to ±10%. The KGM21BCG2D series extends voltage rating to 200V with C0G/NP0 temperature coefficient and ±5% or ±10% tolerance options.

Cross-manufacturer substitution is available through KEMET's C0805C121F5GAC7800, which provides 50V rating, ±1% tolerance, and C0G/NP0 temperature coefficient in the same 0805 package. All substitute parts maintain ROHS3 compliance and MSL 1 moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher voltage rating in place of the 08055C121MAT2A? A: Yes. Higher voltage rated capacitors (100V or 200V) are electrically compatible in circuits designed for 50V operation. The capacitor will operate within its voltage margin, which is acceptable for general purpose applications. Physical dimensions remain identical in the 0805 package.

Q: What is the difference between X7R and C0G/NP0 temperature coefficients? A: X7R temperature coefficient allows capacitance variation of ±15% across the -55°C to 125°C operating range. C0G/NP0 temperature coefficient provides superior stability with minimal capacitance change across temperature. C0G/NP0 is preferred for precision circuits and frequency-dependent applications.

Q: Are tolerance differences significant for my application? A: Tolerance selection depends on circuit requirements. ±20% tolerance (original part) is acceptable for general filtering and coupling applications. ±10% tolerance provides improved accuracy. ±1% to ±5% tolerance is required for precision resonant circuits, timing networks, and applications with tight capacitance specifications.

Q: Can I substitute KEMET C0805C121F5GAC7800 for the KYOCERA AVX part? A: Yes. The KEMET part maintains identical capacitance (120 pF), voltage rating (50V), package (0805), and compliance certifications. Physical dimensions are equivalent. Cross-manufacturer substitution is valid for general purpose applications where the specific manufacturer is not specified in design requirements.

Q: What packaging format should I specify for production? A: All substitute parts listed are available in Tape & Reel (TR) packaging format suitable for automated assembly. The original part number 08055C121MAT2A does not specify packaging format in the provided data. Tape & Reel format is standard for surface mount production environments.

Q: Are all substitute parts in active production status? A: Yes. All substitute parts listed maintain active product status with KYOCERA AVX and KEMET, ensuring continued availability and supply chain reliability.

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