Class II High Reliability Chip (X7R)

The following table represents our standard listing of MLC’s produced from our stable EIA Class II X7R dielectric. In addition to the below listed standard case sizes, WCI is ideally situated to custom fabricate alternative size, thickness and/or voltage ratings per individual requirements. Should you not find what you are looking for please call the factory.

Produced according to meticulously defined standards, all parts are then conditioned at elevated temperature and voltage. 100% of all lots are screened for conformance to stated performance criteria. All units are tested to MIL-PRF-49467 however customer required screening can also be accommodated.

Our high reliability line of class II X7R capacitors are very well suited to applications allowing for predictable changes in electrical properties given time, temperature and voltage. A temperature coefficient of ±15% is standard and typical results are detailed below. Common applications include aerospace, defense, pulse energy detonation and higher end consumer needs requiring a greater degree of safety/reliability (not usually found in “cots” parts).

Case Sizes (in inches)

SIZE 0805 1210 1515 1812 1825 2020 2225 2520 3530
LENGTH-NOM 0.080 0.120 0.150 0.180 0.180 0.200 0.220 0.250 0.350
WIDTH-NOM 0.050 0.100 0.150 0.120 0.250 0.200 0.250 0.200 0.300
THICK-MAX 0.100 0.100 0.150 0.200 0.200 0.200 0.250 0.250 0.250


SIZE 4040 4540 5440 5550 6560 7565 8840 11050 13060
LENGTH-NOM 0.400 0.450 0.540 0.550 0.650 0.750 0.880 1.100 1.300
WIDTH-NOM 0.400 0.400 0.400 0.500 0.600 0.650 0.400 0.500 0.600
THICK-MAX 0.300 0.300 0.300 0.300 0.300 0.300 0.300 0.300 0.300

Dimensions are ±5% length and width or .015;, whichever is greater.
MB=.005/.040

Note: These are standard sizes. We can manufacture any size required. Please consult factory for special builds.


Max Capacitance Table*

SIZE 1210 1515 1812 1825 2020 2225 2520 3530
250V 473 104 104 224 154 274 154
500V 223 563 563 154 104 184 124 394
1000V 562 183 183 563 473 823 563 184
2000V 102 392 392 153 123 183 153 473
3000V 152 152 392 332 472 392 183
4000V 152 562
5000V 102 472
7000V 182
10000V


SIZE 4040 4540 5550 6560 7565 8840 11050 13060
250V
500V 474 564
1000V 274 334 474 105 105
2000V 683 823 154 224 274
3000V 223 223 473 823 104
4000V 822 103 223 333 393 183 473 563
5000V 392 562 822 153 183 822 223 223
7000V 122 472 562 103 682 562 153 183
10000V 102 122 222 392 392 332 562 822

*Note: Maximum capacitance values are shown above as 3 digit code: 2 significant figures followed by the no. of zeros e.g. 153 = 15,000pF. R denotes decimal e.g. 1R5 = 1.5pF

Temperature Coefficient

X7R (X)

Material: X7R (BR)
Operation Temperature Range: -55°C to 125°C.
Temperature Coefficient: ±15%
Dissipation Factor: 2.5% max at 25°C.
Insulation Resistance: at 25°C > 100GΩ or 1000MΩμF or whichever is less.
at 125°C > 10GΩ or 100MΩμF or whichever is less.
Dielectric withstanding Voltage: 250% for parts ≤250V.
150% for parts 250V-1KV.
120% for parts >1KV.
Aging Rate: <2% per decade.
Testing Parameters: 1kHz, 1.0 ± 0.2VRMS, 25°C.
1mHz for capacitance ≤ 100pF.
Temperature Coefficient, Percent Vs. Degrees C

X7R (X)

Material: X7R (BX)
Temperature Coefficient: ±15%
Voltage Coefficient: -25% Max.
Operation Temperature Range: -55°C to 125°C.
Dissipation Factor: 2.5% max at 25°C.
Insulation Resistance: at 25°C > 100GΩ or 1000MΩμF or whichever is less.
at 125°C > 10GΩ or 100MΩμF or whichever is less.
Dielectric withstanding Voltage: 250% for parts ≤250V.
150% for parts 250V-1KV.
120% for parts >1KV.
Aging Rate: <2% per decade.
Testing Parameters: 1kHz, 1.0 ± 0.2VRMS, 25°C.
1mHz for capacitance ≤ 100pF.
Temperature Coefficient, Percent Vs. Degrees C

X8R (U) High Temperature

Material: X8R High Temperature
Operation Temperature Range: -55°C to 160°C.
Temperature Coefficient: + 15% -25% Max
Dissipation Factor: 2.5% max at 25°C.
Insulation Resistance: at 25°C > 100GΩ or 1000MΩμF or whichever is less.
at 125°C > 10GΩ or 100MΩμF or whichever is less.
at 160°C > 1GΩ or 10MΩμF or whichever is less.
Dielectric withstanding Voltage: 250% for parts ≤250V.
150% for parts 250V-1KV.
120% for parts >1KV.
Aging Rate: <2% per decade.
Testing Parameters: 1kHz, 1.0 ± 0.2VRMS, 25°C.
1mHz for capacitance ≤ 100pF.
Temperature Coefficient, Percent Vs. Degrees C

High Temp X7R (X) Class II (200°C)

Material: High Temp X7R Class II (200°C)
Operation Temperature Range: -55°C to 200°C.
Temperature Coefficient: +15% -45% Max
Cap Drop at 200°C: -45% Max
Dissipation Factor: 2.5% max at 25°C.
Insulation Resistance: at 25°C > 100GΩ or 1000MΩμF or whichever is less.
at 125°C > 10GΩ or 100MΩμF or whichever is less.
at 200°C >1GΩ or 10MΩμF or whichever is less.
Dielectric withstanding Voltage: 250% for parts ≤250V.
150% for parts 250V-1KV.
120% for parts >1KV.
Aging Rate: <2% per decade.
Testing Parameters: 1kHz, 1.0 ± 0.2VRMS, 25°C.
1mHz for capacitance ≤ 100pF.
Temperature Coefficient, Percent Vs. Degrees C

Ordering Information

Prefix Case Size Dielectric Capacitance Tolerance Termination Voltage Suffix
WCN 1515 N 222 K D 102  
WC - Standard
WCN - High Reliability
SM - Surface Mount
SMN - Surface Mount with testing
Chip Size N = NPO
X = X7R

See Dielectric Characteristics for full list
Capacitance Value Code in pF
1st two digits significant, 3rd the power of ten
i.e.: 102 = 1000pF
F = ±1%
G = ±2%
J = ±5%
K = ±10%
M = ±20%
Z = +80%/-20%
V = +100%
A = Ag
D = PdAg
Voltage Code
1st two digits significant, 3rd the power of ten
i.e.
102 = 1000V
-A MIL-PRF-49467
-NMNo Marking
-R####Bleed Resistor in MΩ
-X### = Special Thickness

Dielectric Codes

Dielectric Code Material Temperature Coefficient
Please see Dielectric Characteristics for more information
N COG/NPO -55°/+125°C
N COG/NPO Hi Temp -55°/+250°C
R N2T -55°/+125°C/ ±500pm
R N2T Hi Temp -55°/+250°C
X X7R/BR BR -55°/+125°C
X X7R/BR Hi Temp -55°/+250°C
Y Y5V Y5V -30°/+85°C

Prefixes

Prefix Description
WC Standard
WCN Non standard Requirements
High Temperature
High Reliability
WCR RoHS Compliant
HT High Temperature (Potted Units)
HTN High Temp w/ High Reliability Testing (Potted Units)
SM Surface Mount
SMN Surface Mount with High Reliability Testing
SMS Special Solder required (Sn95Sb05)

Capacitance Tolerance Codes

Code Tolerance
F ± 1%
G ± 2%
J ± 5%
K ± 10%
M ± 20%
Z +80%/-20%
V + 100%

Suffixes

Suffix Description
-A MIL-PRF-49467
-NM No Marking
-NC No Coating
-R ### Bleed Resistor
-X### Special Thickness

Electrical test voltages for DWV and voltage conditioning

Device working voltage (DC) DWV Test Voltage Conditioning Test
< 200 2.5 X Rated 2.0 X Rated
250 500 Volts 400 Volts
300 500 Volts 400 Volts
400 600 Volts 500 Volts
500 750 Volts 600 Volts
600 – 1250 1.5 X Rated 1.0 X Rated
> 1250 1.2 X Rated 1.0 X Rated