1812J3K00221KXT Ceramic Capacitor 220pF 3kV X7R Equivalent & Substitute Parts

Part Overview

The 1812J3K00221KXT is a surface mount multilayer ceramic capacitor (MLCC) manufactured by Knowles Syfer with a capacitance of 220 pF, rated voltage of 3000V (3kV), and X7R temperature coefficient. This component is classified as Active and ROHS3 Compliant, suitable for general purpose high-voltage applications. Equivalent and substitute parts are identified based on matching or enhanced electrical specifications within the same package footprint and mechanical constraints.

Key Parameters

Parameter	Value
Capacitance	220 pF
Tolerance	±10%
Voltage Rating	3000V (3kV)
Temperature Coefficient	X7R
Operating Temperature Range	-55°C to 125°C
Package / Case	1812 (4532 Metric)
Mounting Type	Surface Mount, MLCC
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 1812J3K00221KXT are categorized based on the following allowed parameters: capacitance value (220 pF), package footprint (1812 / 4532 Metric), mounting type (Surface Mount MLCC), operating temperature range (-55°C to 125°C), and compliance certifications (ROHS3, REACH Unaffected). Substitutes are grouped into two categories:

Category 1: Voltage Upgrade (Higher Rated Voltage) Parts with rated voltage exceeding 3kV are direct upgrades suitable for applications requiring enhanced voltage margin. The 1812J5K00221KXT (5kV) provides increased voltage headroom while maintaining identical capacitance and package dimensions.

Category 2: Temperature Coefficient Alternatives (C0G/NP0 Dielectric) Parts with C0G/NP0 temperature coefficient offer superior temperature stability and lower capacitance drift compared to X7R. These include 1812J3K00221JCT, 1812J4K00221JCT, 1812HA221JAT1A, 1812HA221KAT1A, C1812C221JHGAC7800, and CC1812JKNPOEBN221. Tolerance specifications vary (±5% or ±10%) but remain within acceptable substitution parameters.

Category 3: Cross-Manufacturer Equivalents (Same Specifications) The C1812C221KHRAC7800 (KEMET) provides electrical equivalence with identical voltage rating, capacitance, and X7R dielectric, differing only in manufacturer and packaging format.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Tolerance	Voltage Rating	Temperature Coefficient	Package	Thickness (Max)	RoHS Status
1812J3K00221KXT	Knowles Syfer	220 pF	±10%	3000V	X7R	1812 (4532)	0.098" (2.50mm)	ROHS3
1812J5K00221KXT	Knowles Syfer	220 pF	±10%	5000V	X7R	1812 (4532)	0.098" (2.50mm)	ROHS3
1812J3K00221JCT	Knowles Syfer	220 pF	±5%	3000V	C0G/NP0	1812 (4532)	0.098" (2.50mm)	ROHS3
1812J4K00221JCT	Knowles Syfer	220 pF	±5%	4000V	C0G/NP0	1812 (4532)	0.098" (2.50mm)	ROHS3
C1812C221KHRAC7800	KEMET	220 pF	±10%	3000V	X7R	1812 (4532)	0.071" (1.80mm)	ROHS3
1812HA221JAT1A	KYOCERA AVX	220 pF	±5%	3000V	C0G/NP0	1812 (4532)	0.087" (2.20mm)	ROHS3
1812HA221KAT1A	KYOCERA AVX	220 pF	±10%	3000V	C0G/NP0	1812 (4532)	0.087" (2.20mm)	ROHS3
C1812C221JHGAC7800	KEMET	220 pF	±5%	3000V	C0G/NP0	1812 (4532)	0.087" (2.20mm)	ROHS3
CC1812JKNPOEBN221	YAGEO	220 pF	±5%	3000V	C0G/NP0	1812 (4532)	0.045" (1.15mm)	ROHS3

Engineering Selection Recommendations

Selection of substitute parts must be based on application requirements for voltage margin, temperature stability, and tolerance specifications. The 1812J5K00221KXT provides voltage upgrade capability while maintaining manufacturer continuity and identical mechanical footprint. For applications requiring superior temperature coefficient performance and tighter tolerance control, C0G/NP0 alternatives (1812J3K00221JCT, 1812J4K00221JCT, 1812HA221JAT1A, 1812HA221KAT1A, C1812C221JHGAC7800, CC1812JKNPOEBN221) are suitable substitutes. All listed parts maintain ROHS3 compliance, MSL 1 rating, and identical operating temperature range (-55°C to 125°C). Cross-manufacturer equivalents (KEMET C1812C221KHRAC7800, KYOCERA AVX 1812HA series, YAGEO CC1812JKNPOEBN221) are electrically compatible with the original specification. Physical dimensions vary slightly in thickness; applications with height constraints should reference specific thickness values provided in the parameter comparison table.

Frequently Asked Questions (FAQ)

Q: Can the 1812J5K00221KXT replace the 1812J3K00221KXT in all applications? A: Yes. The 1812J5K00221KXT is a direct upgrade with identical capacitance (220 pF), tolerance (±10%), temperature coefficient (X7R), package footprint (1812 / 4532 Metric), and operating temperature range. The higher voltage rating (5kV vs. 3kV) provides additional voltage margin and is compatible with circuits designed for 3kV operation.

Q: What is the difference between X7R and C0G/NP0 temperature coefficients? A: X7R dielectric exhibits capacitance variation of ±15% across the operating temperature range (-55°C to 125°C). C0G/NP0 dielectric provides superior stability with minimal capacitance drift across temperature. C0G/NP0 alternatives are suitable for applications requiring tighter capacitance tolerance and temperature stability.

Q: Are KEMET, KYOCERA AVX, and YAGEO parts pin-compatible with the Knowles Syfer original? A: Yes. All substitute parts use identical 1812 (4532 Metric) package footprint with surface mount configuration. Pin spacing and solder pad layout are standardized for this package type, ensuring mechanical and electrical compatibility on PCB assemblies.

Q: Does tolerance specification affect substitution suitability? A: Tolerance affects circuit performance precision. The original part specifies ±10% tolerance. Substitutes with ±5% tolerance (1812J3K00221JCT, 1812J4K00221JCT, 1812HA221JAT1A, C1812C221JHGAC7800, CC1812JKNPOEBN221) provide tighter capacitance control and are suitable for applications requiring improved accuracy. Substitutes with ±10% tolerance (1812J5K00221KXT, 1812HA221KAT1A, C1812C221KHRAC7800) maintain equivalent tolerance specification.

Q: What is the significance of thickness variation among substitute parts? A: Thickness variation (ranging from 0.045" to 0.098") affects PCB assembly clearance and component stacking in high-density layouts. Applications with height constraints or specific assembly requirements should select parts matching the original thickness specification (0.098" / 2.50mm) or verify compatibility with thinner alternatives (CC1812JKNPOEBN221 at 0.045" / 1.15mm).

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts are ROHS3 Compliant with MSL 1 (Unlimited) moisture sensitivity rating and REACH Unaffected status, matching the original part's environmental and regulatory compliance.

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