Murata Multilayer Chip SMD Ceramic Capacitor Distributor–Circuit Ocean International Company.
Murata Temperature Characteristic:
Temperature Characteristic Codes Public STD Code Reference Temperature Temperature Characteristics Capacitance Change Each Temperature (%) Capacitance Change or Temperature Coefficient Operating Temperature Range –55°C Max. Temperature *3 –10°C Range C0G CK CJ CH SL U2J UJ X8G X7R X7S X7T X7U R X6S X6T X5R B EIA JIS JIS JIS JIS EIA JIS *1 EIA EIA EIA EIA JIS EIA EIA EIA JIS 25°C 20°C 20°C 20°C 20°C 25°C 20°C 25°C 25°C 25°C 25°C 25°C 20°C 25°C 25°C 25°C 20°C 25 to 125°C 20 to 125°C 20 to 125°C 20 to 125°C 20 to 85°C 25 to 125°C *2 20 to 85°C 25 to 150°C –55 to 125°C –55 to 125°C –55 to 125°C –55 to 125°C –55 to 125°C –55 to 105°C –55 to 105°C –55 to 85°C –25 to 85°C 0±30ppm/°C 0±250ppm/°C 0±120ppm/°C 0±60ppm/°C +350 to –1000ppm/°C –750±120ppm/°C –750±120ppm/°C 0±30ppm/°C ±15% ±22% +22%, –33% +22%, –56% ±15% ±22% +22%, –33% ±15% ±10% –55 to 125°C –55 to 125°C –55 to 125°C –55 to 125°C –55 to 125°C –55 to 125°C –25 to 85°C –55 to 150°C –55 to 125°C –55 to 125°C –55 to 125°C –55 to 125°C –55 to 125°C –55 to 105°C –55 to 105°C –55 to 85°C –25 to 85°C 0.58 2.56 1.37 0.82 – 8.78 – 0.58 – – – – – – – – – Min. –0.24 –1.88 –0.9 –0.45 – 5.04 – –0.24 – – – – – – – – – Max. 0.4 1.54 0.82 0.49 – 6.04 4.94 0.4 – – – – – – – – – Min. –0.17 –1.13 –0.54 –0.27 – 3.47 2.84 –0.17 – – – – – – – – – Max. 0.25 1.02 0.55 0.33 – 3.84 3.29 0.25 – – – – – – – – – Min. –0.11 –0.75 –0.36 –0.18 – 2.21 1.89 –0.11 – – – –
Murata Capacitor Storage and Operation Conditions,
1. The performance of chip monolithic ceramic capacitors may be affected by the storage conditions. 1-1. Store the capacitors in the following conditions: Room Temperature of +5°C to +40°C and a Relative Humidity of 20% to 70%. (1) Sunlight, dust, rapid temperature changes, corrosive gas atmosphere, or high temperature and humidity conditions during storage may affect solderability and packaging performance. Therefore, please maintain the storage temperature and humidity. Use the product within six months, as prolonged storage may cause oxidation of the terminations (outer electrodes). (2) Please confirm solderability before using after six months. Store the capacitors without opening the original bag. Even if the storage period is short, do not exceed the specified atmospheric conditions.
1-2. Corrosive gas can react with the termination (external) electrodes or lead wires of capacitors, and result in poor solderability. Do not store the capacitors in an atmosphere consisting of corrosive gas (e.g., hydrogen sulfide, sulfur dioxide, chlorine, ammonia gas, etc.). 1-3. Due to moisture condensation caused by rapid humidity changes, or the photochemical change caused by direct sunlight on the terminal electrodes and/or the resin/epoxy coatings, the solderability and electrical performance may deteriorate. Do not store capacitors under direct sunlight or in high humidity conditions.
1. Temperature Dependent Characteristics 1. The electrical characteristics of a capacitor can change with temperature. 1-1. For capacitors having larger temperature dependency, the capacitance may change with temperature changes. The following actions are recommended in order to ensure suitable capacitance values. (1) Select a suitable capacitance for the operating temperature range.
(2) The capacitance may change within the rated temperature. When you use a high dielectric constant type capacitor in a circuit that needs a tight (narrow) capacitance tolerance (e.g., a time-constant circuit), please carefully consider the temperature characteristics, and carefully confirm the various characteristics in actual use conditions and the actual system.
2. Measurement of Capacitance 1. Measure capacitance with the voltage and frequency specified in the product specifications. 1-1. The output voltage of the measuring equipment may decrease occasionally when capacitance is high. Please confirm whether a prescribed measured voltage is impressed to the capacitor.
1-2. The capacitance values of high dielectric constant type capacitors change depending on the AC voltage applied. Please consider the AC voltage characteristics when selecting a capacitor to be used in an AC circuit.
3. Applied Voltage 1. Do not apply a voltage to the capacitor that exceeds the rated voltage as called out in the specifications. 1-1. Applied voltage between the terminals of a capacitor shall be less than or equal to the rated voltage. (1) When AC voltage is superimposed on DC voltage, the zero-to-peak voltage shall not exceed the rated DC voltage. When AC voltage or pulse voltage is applied, the peak-to-peak voltage shall not exceed the rated DC voltage. (2) Abnormal voltages (surge voltage, static electricity, pulse voltage, etc.) shall not exceed the rated DC voltage.
1-2. Influence of over voltage Over voltage that is applied to the capacitor may result in an electrical short circuit caused by the breakdown of the internal dielectric layers. The time duration until breakdown depends on the applied voltage and the ambient temperature. 2. Use a safety standard certified capacitor in a power supply input circuit (AC filter), as it is also necessary to consider the withstand voltage and impulse withstand voltage defined for each device.
4. Type of Applied Voltage and Self-heating Temperature 1. Confirm the operating conditions to make sure that no large current is flowing into the capacitor due to the continuous application of an AC voltage or pulse voltage. When a DC rated voltage product is used in an AC voltage circuit or a pulse voltage circuit, the AC current or pulse current will flow into the capacitor; therefore check the self-heating condition. Please confirm the surface temperature of the capacitor so that the temperature remains within the upper limits of the operating temperature, including the rise in temperature due to self-heating. When the capacitor is used with a high-frequency voltage or pulse voltage, heat may be generated by dielectric loss. 1-1. The load should be contained to the level such that when measuring at atmospheric temperature of 25°C, the product's self-heating remains below 20°C and the surface temperature of the capacitor in the actual circuit remains within the maximum operating temperature.
1-2. The load should be contained so that the self-heating of the capacitor body remains below 20°C, when measuring at an ambient temperature of 25°C. In addition, use a K thermocouple of ø0.1mm with less heat capacity when measuring, and measure in a condition where there is no effect from the radiant heat of other components or air flow caused by convection. Excessive generation of heat may cause deterioration of the characteristics and reliability of the capacitor. (Absolutely do not perform measurements while the cooling fan is operating, as an accurate measurement may not be performed.)
1-3. Since the self-heating is low in the low loss series, the allowable power becomes extremely high compared to the common X7R (R7) characteristics. However, when a load with self-heating of 20°C is applied at the rated voltage, the allowable power may be exceeded. When the capacitor is used in a high-frequency voltage circuit of 1kHz or more, the frequency of the applied voltage should be less than 500kHz sine wave (less than 100kHz for a product with rated voltage of DC3.15kV), to limit the voltage load so that the load remains within the derating shown in the following figure. In the case of non-sine wave, high-frequency components exceeding the fundamental frequency may be included. In such a case, please contact Murata. The excessive generation of heat may cause deterioration of the characteristics and reliability of the capacitor. (Absolutely do not perform measurements while the cooling fan is operating, as an accurate measurement may not be performed.)