3-TERMINAL FIXED VOLTAGE REGULATOR Shantou Huashan Electronic Devices Co.,Ltd. H 7818 █ Description The H7818 series of three terminal positive Regulators are available in the TO-220 package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, Thermal shut down and safe operating area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 1A output current. Although designed primarily as fixed voltage regulator, these devices can be used with external components to obtain adjustable voltages and currents. █ Features Output current up to 1A TO-220 Output Voltages of 18V Thermal Overload Protection Short Circuit Protection Output Transistor Safe Operating Area Protection █ Absolute Maximum Ratings（Ta=25℃） 1―INPUT 2―GND 3―OUTPUT VI——Input Voltage (for VO=5V to 18V)……………… 35V RθJC——Thermal Resistance Junction-Cases………… 5℃/W RθJA——Thermal Resistance Junction-Air………… 65℃/W TOPR——Operating Temperature Range…………… 0~125℃ TSTG——Storage Temperature Range…………… -65~150℃ 1 Shantou Huashan Electronic Devices Co.,Ltd. H 7818 （Refer to test circuit, unless otherwise specified，0℃≤TJ≤125℃,IO=500mA,VI=27V,CI=0.33μF,CO=0.1μF） Symbol VO Parameter Min. Typ. Max. 17.3 18 18.7 Output Voltage Unit TJ=25℃ V 17.1 18 Conditions 5.OmA≤IO≤1.0A, PD≤15W, 18.9 21V≤VI≤33V 15 ΔVO ΔVO IQ 360 Line Regulation (Note1) TJ=25℃, 21V≤VI≤33V mV 5 180 15 360 Load Regulation (Note1) TJ=25℃, 24V≤VI≤30V TJ=25℃, 5.0mA≤IO≤1.5A mV Quiescent Current 5.0 180 5.2 8 TJ=25℃, 250mA≤IO≤750mA mA 0.5 ΔIQ Quiescent Current Change TJ=25℃ 5mA≤IO≤1.0A mA 21V≤VI≤33V 1.0 ΔVO/ΔT Output Voltage Drift -1 mV/℃ VN Output Noise Voltage 110 μV TA=25℃, 10Hz≤f≤100kHz RR Ripple Rejection 69 dB f=120Hz, 22V≤VI≤32V VD Dropout Voltage 2 V IO=1A, TJ=25℃ RO Output Resistance 22 mΩ f=1kHz ISC Short Circuit Current 250 mA VI=35V, TA=25℃ IPK Peak Current 2.2 A TJ=25℃ 53 IO=5mA 2 Shantou Huashan Electronic Devices Co.,Ltd. H 7818 █ 1、 2、 3、 4、 █ 5、 6、 3 Shantou Huashan Electronic Devices Co.,Ltd. H 7818 8、 7、 10、 9、 11、 12、 13、 4 Shantou Huashan Electronic Devices Co.,Ltd. H 7818 5