Add date Part number Description Manufacture PDF
10-10-2014 AS7C32098A February 2006 ® AS7C32098A 3.3 V Alliance Semiconductor AS7C32098A datasheet
10-10-2014 AS7C32096A February 2006 ® AS7C32096A 3.3V Alliance Semiconductor AS7C32096A datasheet
10-10-2014 R1RW0404D R1RW0404D Series 4M High Speed SRAM Renesas R1RW0404D datasheet
10-10-2014 R1RW0404DGE-2PR R1RW0404D Series 4M High Speed SRAM Renesas R1RW0404DGE-2PR datasheet
10-10-2014 R1RW0404DGE-2LR R1RW0404D Series 4M High Speed SRAM Renesas R1RW0404DGE-2LR datasheet
10-10-2014 AS7C34098A August 2004 ® AS7C34098A 3.3 V 2 Alliance Semiconductor AS7C34098A datasheet
10-10-2014 AS8C403601-QC166N AS8C403601, AS8C401801,128K x 36, 2 Alliance Semiconductor AS8C403601-QC166N datasheet
10-10-2014 AS8C401801-QC166N AS8C403601, AS8C401801,128K x 36, 2 Alliance Semiconductor AS8C401801-QC166N datasheet
10-10-2014 AS8C403600 128K x 36, 256K x 18 3.3V Synchrono Alliance Semiconductor AS8C403600 datasheet
10-10-2014 AS8C401800 128K x 36, 256K x 18 3.3V Synchrono Alliance Semiconductor AS8C401800 datasheet
10-10-2014 AS8C403601 AS8C403601, AS8C401801,128K x 36, 2 Alliance Semiconductor AS8C403601 datasheet
10-10-2014 AS8C401801 AS8C403601, AS8C401801,128K x 36, 2 Alliance Semiconductor AS8C401801 datasheet
10-10-2014 AS8C403625 128K X 36, 256K X 18 3.3V Synchrono Alliance Semiconductor AS8C403625 datasheet
10-10-2014 AS8C401825 128K X 36, 256K X 18 3.3V Synchrono Alliance Semiconductor AS8C401825 datasheet
10-10-2014 AS8C803601 256K x 36, 512K x 18 3.3V Synchrono Alliance Semiconductor AS8C803601 datasheet
10-10-2014 AS8C801801 256K x 36, 512K x 18 3.3V Synchrono Alliance Semiconductor AS8C801801 datasheet
10-10-2014 AS8C803600 256K X 36, 512K X 18 3.3V Synchrono Alliance Semiconductor AS8C803600 datasheet
10-10-2014 AS8C801800 256K X 36, 512K X 18 3.3V Synchrono Alliance Semiconductor AS8C801800 datasheet
10-10-2014 R1RP0416D R1RP0416D Series 4M High Speed SRAM Renesas R1RP0416D datasheet
10-10-2014 R1RP0416DGE-2PR R1RP0416D Series 4M High Speed SRAM Renesas R1RP0416DGE-2PR datasheet
10-10-2014 R1RP0416DGE-2LR R1RP0416D Series 4M High Speed SRAM Renesas R1RP0416DGE-2LR datasheet
10-10-2014 R1RP0416DSB-2PR R1RP0416D Series 4M High Speed SRAM Renesas R1RP0416DSB-2PR datasheet
10-10-2014 R1RP0416DSB-2LR R1RP0416D Series 4M High Speed SRAM Renesas R1RP0416DSB-2LR datasheet
10-10-2014 AS7C4096A February 2006 ® AS7C4096A 5.0V 5 Alliance Semiconductor AS7C4096A datasheet
10-10-2014 R1RP0408D R1RP0408D Series 4M High Speed SRAM Renesas R1RP0408D datasheet
10-10-2014 R1RP0408DGE-0PR R1RP0408D Series 4M High Speed SRAM Renesas R1RP0408DGE-0PR datasheet
10-10-2014 R1RP0408DGE-2PR R1RP0408D Series 4M High Speed SRAM Renesas R1RP0408DGE-2PR datasheet
10-10-2014 R1RP0408DGE-2LR R1RP0408D Series 4M High Speed SRAM Renesas R1RP0408DGE-2LR datasheet
10-10-2014 AS8C163631 Alliance Semiconductor AS8C163631 datasheet
10-10-2014 AS8C161831 Alliance Semiconductor AS8C161831 datasheet
10-10-2014 AS7C1026B March 2004 ® AS7C1026B 5 V 64K X Alliance Semiconductor AS7C1026B datasheet
10-10-2014 AS7C1026C September 2006 A AS7C1026C ® 5 V Alliance Semiconductor AS7C1026C datasheet
10-10-2014 R1RP0404D R1RP0404D Series 4M High Speed SRAM Renesas R1RP0404D datasheet
10-10-2014 R1RP0404DGE-2PR R1RP0404D Series 4M High Speed SRAM Renesas R1RP0404DGE-2PR datasheet
10-10-2014 R1RP0404DGE-2LR R1RP0404D Series 4M High Speed SRAM Renesas R1RP0404DGE-2LR datasheet
10-10-2014 AS7C4098A February 2006 ® AS7C4098A 5.0 V Alliance Semiconductor AS7C4098A datasheet
10-10-2014 AS7C4098 March 2002 ® AS7C4098 AS7C34098 5 Alliance Semiconductor AS7C4098 datasheet
10-10-2014 AS7C34098 March 2002 ® AS7C4098 AS7C34098 5 Alliance Semiconductor AS7C34098 datasheet
10-10-2014 ZAPD-2 Power Splitter/Combiner 2 Way-0° M Mini-Circuits ZAPD-2 datasheet
10-10-2014 TX2A Hartcran House, 231 Kenton Lane, Ha Radiometrix TX2A datasheet
10-10-2014 RX2G Hartcran House, 231 Kenton Lane, Ha Radiometrix RX2G datasheet
10-10-2014 TX2H-4xx-64 W E N 05 October 2009 Radiometrix Radiometrix TX2H-4xx-64 datasheet
10-10-2014 TX2H W E N 05 October 2009 Radiometrix Radiometrix TX2H datasheet
10-10-2014 TX2H-433-64-3V W E N 05 October 2009 Radiometrix Radiometrix TX2H-433-64-3V datasheet
10-10-2014 TX2H-433-64-5V W E N 05 October 2009 Radiometrix Radiometrix TX2H-433-64-5V datasheet
10-10-2014 TX2H-434-64-3V W E N 05 October 2009 Radiometrix Radiometrix TX2H-434-64-3V datasheet
10-10-2014 TX2H-434-64-5V W E N 05 October 2009 Radiometrix Radiometrix TX2H-434-64-5V datasheet
10-10-2014 TX2EH-433-64-5V W E N 05 October 2009 Radiometrix Radiometrix TX2EH-433-64-5V datasheet
10-10-2014 TX2EH-434-64-5V W E N 05 October 2009 Radiometrix Radiometrix TX2EH-434-64-5V datasheet
10-10-2014 AWL9565 802.11a/n Power Amplifier & Switch ANADIGICS AWL9565 datasheet
10-10-2014 AWL9565HS41P7 802.11a/n Power Amplifier & Switch ANADIGICS AWL9565HS41P7 datasheet
10-10-2014 AWL9565HS41P9 802.11a/n Power Amplifier & Switch ANADIGICS AWL9565HS41P9 datasheet
10-10-2014 AWL9565HS41Q7 802.11a/n Power Amplifier & Switch ANADIGICS AWL9565HS41Q7 datasheet
10-10-2014 SE5512L DATA SHEET SE5512L: Dual-Band 802.1 Skyworks Solutions SE5512L datasheet
10-10-2014 SE5512L-R DATA SHEET SE5512L: Dual-Band 802.1 Skyworks Solutions SE5512L-R datasheet
10-10-2014 18F45K22 PIC18(L)F2X/4XK22 28/40/44-Pin, Low Microchip Technology 18F45K22 datasheet
10-10-2014 R1RW0408D R1RW0408D Series 4M High Speed SRAM Renesas R1RW0408D datasheet
10-10-2014 R1RW0408DGE-2PR R1RW0408D Series 4M High Speed SRAM Renesas R1RW0408DGE-2PR datasheet
10-10-2014 R1RW0408DGE-2LR R1RW0408D Series 4M High Speed SRAM Renesas R1RW0408DGE-2LR datasheet
10-10-2014 AS7C164A NOVEMBER 2009 AS7C164A 8K X 8 BIT Alliance Semiconductor AS7C164A datasheet
10-10-2014 R1RW0416D R1RW0416D Series 4M High Speed SRAM Renesas R1RW0416D datasheet
10-10-2014 R1RW0416DGE-2PR R1RW0416D Series 4M High Speed SRAM Renesas R1RW0416DGE-2PR datasheet
10-10-2014 R1RW0416DGE-2LR R1RW0416D Series 4M High Speed SRAM Renesas R1RW0416DGE-2LR datasheet
10-10-2014 R1RW0416DSB-2PR R1RW0416D Series 4M High Speed SRAM Renesas R1RW0416DSB-2PR datasheet
10-10-2014 R1RW0416DSB-2LR R1RW0416D Series 4M High Speed SRAM Renesas R1RW0416DSB-2LR datasheet
10-10-2014 C3302 Toshiba Semiconductor C3302 datasheet
10-10-2014 BF975NF75B BF975NF75B BYD Microelectronics Co. BYD Microelectronics BF975NF75B datasheet
10-10-2014 GT10 GT10/GT30 Technical Manual Matsushi NAiS GT10 datasheet
10-10-2014 GT30 GT10/GT30 Technical Manual Matsushi NAiS GT30 datasheet
10-10-2014 16F020C 深圳市晶导电子有限公司 S Jingdao Electronic 16F020C datasheet
10-10-2014 AS6C6264A   MARCH 2009  AS6C6264A    8 Alliance Semiconductor AS6C6264A datasheet
10-10-2014 R1LP5256E R1LP5256E Series 256Kb Advanced LPS Renesas R1LP5256E datasheet
10-10-2014 R1LP5256ESP-5SR R1LP5256E Series 256Kb Advanced LPS Renesas R1LP5256ESP-5SR datasheet
10-10-2014 R1LP5256ESP-5SI R1LP5256E Series 256Kb Advanced LPS Renesas R1LP5256ESP-5SI datasheet
10-10-2014 R1LP5256ESP-7SR R1LP5256E Series 256Kb Advanced LPS Renesas R1LP5256ESP-7SR datasheet
10-10-2014 R1LP5256ESP-7SI R1LP5256E Series 256Kb Advanced LPS Renesas R1LP5256ESP-7SI datasheet
10-10-2014 R1LP5256ESA-5SR R1LP5256E Series 256Kb Advanced LPS Renesas R1LP5256ESA-5SR datasheet
10-10-2014 R1LP5256ESA-5SI R1LP5256E Series 256Kb Advanced LPS Renesas R1LP5256ESA-5SI datasheet
10-10-2014 R1LP5256ESA-7SR R1LP5256E Series 256Kb Advanced LPS Renesas R1LP5256ESA-7SR datasheet
10-10-2014 R1LP5256ESA-7SI R1LP5256E Series 256Kb Advanced LPS Renesas R1LP5256ESA-7SI datasheet
10-10-2014 AS6C1016 AS6C1016 64K X 16 BIT LOW POWER CMO Alliance Semiconductor AS6C1016 datasheet
10-10-2014 AS6C2016 FEBRUARY 2008 January 2007 AS6C201 Alliance Semiconductor AS6C2016 datasheet
10-10-2014 AS6C2008A AUGUST 2007 January 2007 AS6C2008A Alliance Semiconductor AS6C2008A datasheet
10-10-2014 AS6C4016 MARCH January 2008 2007 AS6C4016 Alliance Semiconductor AS6C4016 datasheet
10-10-2014 AS6C8008 JANUARY 2008 January 2007 AS6C8008 Alliance Semiconductor AS6C8008 datasheet
10-10-2014 AS6C8016 NOVEMBER 2007 January 2007 AS6C801 Alliance Semiconductor AS6C8016 datasheet
10-10-2014 R1LV5256E R1LV5256E Series 256Kb Advanced LPS Renesas R1LV5256E datasheet
10-10-2014 R1LV5256ESP-5SR R1LV5256E Series 256Kb Advanced LPS Renesas R1LV5256ESP-5SR datasheet
10-10-2014 R1LV5256ESP-5SI R1LV5256E Series 256Kb Advanced LPS Renesas R1LV5256ESP-5SI datasheet
10-10-2014 R1LV5256ESP-7SR R1LV5256E Series 256Kb Advanced LPS Renesas R1LV5256ESP-7SR datasheet
10-10-2014 R1LV5256ESP-7SI R1LV5256E Series 256Kb Advanced LPS Renesas R1LV5256ESP-7SI datasheet
10-10-2014 R1LV5256ESA-5SR R1LV5256E Series 256Kb Advanced LPS Renesas R1LV5256ESA-5SR datasheet
10-10-2014 R1LV5256ESA-5SI R1LV5256E Series 256Kb Advanced LPS Renesas R1LV5256ESA-5SI datasheet
10-10-2014 R1LV5256ESA-7SR R1LV5256E Series 256Kb Advanced LPS Renesas R1LV5256ESA-7SR datasheet
10-10-2014 R1LV5256ESA-7SI R1LV5256E Series 256Kb Advanced LPS Renesas R1LV5256ESA-7SI datasheet
10-10-2014 R1LV0416D R1LV0416D Series 4M SRAM (256-kword Renesas R1LV0416D datasheet
10-10-2014 R1LV0416DSB-5SI R1LV0416D Series 4M SRAM (256-kword Renesas R1LV0416DSB-5SI datasheet
10-10-2014 R1LV0416DSB-7LI R1LV0416D Series 4M SRAM (256-kword Renesas R1LV0416DSB-7LI datasheet
10-10-2014 R1LV0416DBG-5SI R1LV0416D Series 4M SRAM (256-kword Renesas R1LV0416DBG-5SI datasheet
10-10-2014 R1LV0416DBG-7LI R1LV0416D Series 4M SRAM (256-kword Renesas R1LV0416DBG-7LI datasheet
10-10-2014 R1LV0414D R1LV0414D Series 4M SRAM (256-kword Renesas R1LV0414D datasheet
10-10-2014 R1LV0414DSB-5SI R1LV0414D Series 4M SRAM (256-kword Renesas R1LV0414DSB-5SI datasheet
10-10-2014 R1LV0414DSB-7LI Renesas R1LV0414DSB-7LI  datasheet
10-10-2014 R1LV0408D R1LV0408D Series 4M SRAM (512-kword Renesas R1LV0408D datasheet
10-10-2014 R1LV0414DSB-7LI R1LV0414D Series 4M SRAM (256-kword Renesas R1LV0414DSB-7LI datasheet
10-10-2014 TIP150 TIP150, TIP151, TIP152 Silicon NPN NTE TIP150 datasheet
10-10-2014 TIP151 TIP150, TIP151, TIP152 Silicon NPN NTE TIP151 datasheet
10-10-2014 TIP152 TIP150, TIP151, TIP152 Silicon NPN NTE TIP152 datasheet
10-10-2014 dsPIC33FJ16GP101 dsPIC33FJ16(GP/MC)101/102 AND dsPIC Microchip Technology dsPIC33FJ16GP101 datasheet
10-10-2014 dsPIC33FJ16GP102 dsPIC33FJ16(GP/MC)101/102 AND dsPIC Microchip Technology dsPIC33FJ16GP102 datasheet
10-10-2014 dsPIC33FJ16MC101 dsPIC33FJ16(GP/MC)101/102 AND dsPIC Microchip Technology dsPIC33FJ16MC101 datasheet
10-10-2014 dsPIC33FJ16MC102 dsPIC33FJ16(GP/MC)101/102 AND dsPIC Microchip Technology dsPIC33FJ16MC102 datasheet
10-10-2014 dsPIC33FJ32GP101 dsPIC33FJ16(GP/MC)101/102 AND dsPIC Microchip Technology dsPIC33FJ32GP101 datasheet
10-10-2014 dsPIC33FJ32GP102 dsPIC33FJ16(GP/MC)101/102 AND dsPIC Microchip Technology dsPIC33FJ32GP102 datasheet
10-10-2014 dsPIC33FJ32GP104 dsPIC33FJ16(GP/MC)101/102 AND dsPIC Microchip Technology dsPIC33FJ32GP104 datasheet
10-10-2014 dsPIC33FJ32MC101 dsPIC33FJ16(GP/MC)101/102 AND dsPIC Microchip Technology dsPIC33FJ32MC101 datasheet
10-10-2014 dsPIC33FJ32MC102 dsPIC33FJ16(GP/MC)101/102 AND dsPIC Microchip Technology dsPIC33FJ32MC102 datasheet
10-10-2014 dsPIC33FJ32MC104 dsPIC33FJ16(GP/MC)101/102 AND dsPIC Microchip Technology dsPIC33FJ32MC104 datasheet
10-10-2014 AS6C8016A AS6C8016A Low Power, 512Kx16 SRAM R Alliance Semiconductor AS6C8016A datasheet
10-10-2014 AS6C1616 APRIL 2010 AS6C1616 1024K X 16 BI Alliance Semiconductor AS6C1616 datasheet
10-10-2014 AS6C1616A AUGUST 2010 1024K X 16 BIT LOW POWE Alliance Semiconductor AS6C1616A datasheet
10-10-2014 R1WV3216R R1W V3216R Series 32Mb Advanced LPS Renesas Technology R1WV3216R datasheet
10-10-2014 R1WV3216RBG-8S R1W V3216R Series 32Mb Advanced LPS Renesas Technology R1WV3216RBG-8S datasheet
10-10-2014 R1WV3216RBG-7S R1W V3216R Series 32Mb Advanced LPS Renesas Technology R1WV3216RBG-7S datasheet
10-10-2014 R1WV3216RSD-8S R1W V3216R Series 32Mb Advanced LPS Renesas Technology R1WV3216RSD-8S datasheet
10-10-2014 R1WV3216RSD-7S R1W V3216R Series 32Mb Advanced LPS Renesas Technology R1WV3216RSD-7S datasheet
10-10-2014 R1LV3216R R1LV3216R Series 32Mb Advanced LPSR Renesas Technology R1LV3216R datasheet
10-10-2014 R1LV3216RSA-5S R1LV3216R Series 32Mb Advanced LPSR Renesas Technology R1LV3216RSA-5S datasheet
10-10-2014 R1LV3216RSA-7S R1LV3216R Series 32Mb Advanced LPSR Renesas Technology R1LV3216RSA-7S datasheet
10-10-2014 R1LV3216RSD-5S R1LV3216R Series 32Mb Advanced LPSR Renesas Technology R1LV3216RSD-5S datasheet
10-10-2014 R1LV3216RSD-7S R1LV3216R Series 32Mb Advanced LPSR Renesas Technology R1LV3216RSD-7S datasheet
10-10-2014 R1WV6416R R1WV6416R Series 64Mb Advanced LPSR Renesas Technology R1WV6416R datasheet
10-10-2014 R1WV6416RSA-5S R1WV6416R Series 64Mb Advanced LPSR Renesas Technology R1WV6416RSA-5S datasheet
10-10-2014 R1WV6416RSA-7S R1WV6416R Series 64Mb Advanced LPSR Renesas Technology R1WV6416RSA-7S datasheet
10-10-2014 R1WV6416RSD-5S R1WV6416R Series 64Mb Advanced LPSR Renesas Technology R1WV6416RSD-5S datasheet
10-10-2014 R1WV6416RSD-7S R1WV6416R Series 64Mb Advanced LPSR Renesas Technology R1WV6416RSD-7S datasheet
10-10-2014 R1WV6416RBG-5S R1WV6416R Series 64Mb Advanced LPSR Renesas Technology R1WV6416RBG-5S datasheet
10-10-2014 R1WV6416RBG-7S R1WV6416R Series 64Mb Advanced LPSR Renesas Technology R1WV6416RBG-7S datasheet
10-10-2014 AS28F128J3A AUSTIN SEMICONDUCTOR, INC. Austin S Austin Semiconductor AS28F128J3A datasheet
10-10-2014 AS6nvLC512K8 ADVANCE INFORMATION AS6nvLC512K8 A Micross Components AS6nvLC512K8 datasheet
10-10-2014 AS6nvLC256K16 ADVANCE INFORMATION AS6nvLC512K8 A Micross Components AS6nvLC256K16 datasheet
10-10-2014 AS5SP128K32 AS5SP128K32 Plastic Encapsulated Mi Micross Components AS5SP128K32 datasheet
10-10-2014 990000475P 990000475P Preliminary Ver.: 0.1 L TPO 990000475P datasheet
10-10-2014 G156XW01-V1 AUO Confidential For DATA_DISPLAY I AUO G156XW01-V1 datasheet
10-10-2014 G156XW01-V0 www..net Avnet Embedded AUO G156XW01-V0 datasheet
10-10-2014 AS5SP256K36 COTS PEM SSRAM AS5SP256K36 9.0Mb, 2 Micross Components AS5SP256K36 datasheet
10-10-2014 AS5SS512K36 SSRAM AS5SS512K36 512K x 36 SSRAM F Micross Components AS5SS512K36 datasheet
10-10-2014 AS5SS512K36D SSRAM AS5SS512K36 512K x 36 SSRAM F Micross Components AS5SS512K36D datasheet
10-10-2014 AS5SS512K36D SSRAM AS5SS512K36 512K x 36 SSRAM F Micross Components AS5SS512K36D datasheet
10-10-2014 VCA3 VCA3 series 3.3, 5.0 volt CMOS Osci Vectron VCA3 datasheet
10-10-2014 T315HW07-V8 T315HW07 V8 Product Specification R AUO T315HW07-V8 datasheet
10-10-2014 TM-1808 TM-1808 Series Features: ¡D PBT Ho ETC TM-1808 datasheet
10-10-2014 TM-1808NO TM-1808 Series Features: ¡D PBT Ho ETC TM-1808NO datasheet
10-10-2014 TM-1808NC TM-1808 Series Features: ¡D PBT Ho ETC TM-1808NC datasheet
10-10-2014 TM-1808NO-P TM-1808 Series Features: ¡D PBT Ho ETC TM-1808NO-P datasheet
10-10-2014 TM-1808NC-P TM-1808 Series Features: ¡D PBT Ho ETC TM-1808NC-P datasheet
10-10-2014 TM-1808NO-C TM-1808 Series Features: ¡D PBT Ho ETC TM-1808NO-C datasheet
10-10-2014 TM-1808NC-C TM-1808 Series Features: ¡D PBT Ho ETC TM-1808NC-C datasheet
10-10-2014 TM-1202AO TM-1808 Series Features: ¡D PBT Ho ETC TM-1202AO datasheet
10-10-2014 TM-1202AC TM-1808 Series Features: ¡D PBT Ho ETC TM-1202AC datasheet
10-10-2014 TM-1808PO TM-1808 Series Features: ¡D PBT Ho ETC TM-1808PO datasheet
10-10-2014 TM-1808PC TM-1808 Series Features: ¡D PBT Ho ETC TM-1808PC datasheet
10-10-2014 TM-1808PO-P TM-1808 Series Features: ¡D PBT Ho ETC TM-1808PO-P datasheet
10-10-2014 TM-1808PC-P TM-1808 Series Features: ¡D PBT Ho ETC TM-1808PC-P datasheet
10-10-2014 TM-1808PO-C TM-1808 Series Features: ¡D PBT Ho ETC TM-1808PO-C datasheet
10-10-2014 TM-1808PC-C TM-1808 Series Features: ¡D PBT Ho ETC TM-1808PC-C datasheet
10-10-2014 TM1808 12 通道 LED 驱动 IC 特性描� Titan Micro TM1808 datasheet
10-10-2014 MS21266 Genuine Aircraft Hardware Co. Gromm Genuine Aircraft Hardware MS21266 datasheet
10-10-2014 D1272 Power Transistors 2SD1272 Silicon Panasonic Semiconductor D1272 datasheet
10-10-2014 HY3506P HY3506P/W N-Channel Enhancement Mod HOOYI HY3506P datasheet
10-10-2014 HY3506W HY3506P/W N-Channel Enhancement Mod HOOYI HY3506W datasheet

4-2024    3-2024    2-2024    1-2024
12-2023    11-2023    10-2023    9-2023    8-2023    7-2023    6-2023    5-2023    4-2023    3-2023    2-2023    1-2023
12-2022    11-2022    10-2022    9-2022    8-2022    7-2022    6-2022    5-2022    4-2022    3-2022    2-2022    1-2022
12-2021    11-2021    10-2021    9-2021    8-2021    7-2021    6-2021    5-2021    4-2021    3-2021    2-2021    1-2021


31  30  29  28  27  26  25  24  23  22  21  20  19  18  17  16  15  14  13  12  11  10  09  08  07  06  05  04  03  02  01


The site has been moved : DatasheetsPDF.com
Since 2005 - HOME - Link US - All - Privacy Policy & Contact Us