Semiconductors Parts begin by SC Page 8

SC2128C-M23S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 23S

SC2128C-M24D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 24D

SC2128C-M24S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 24S

SC2128C-M30D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 30D

SC2128C-M30S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 30S

SC2128C-M31D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 31D

SC2128C-M31S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 31S

SC2128C-M32D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 32D

SC2128C-M32S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 32S

SC2128C-M33D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 33D

SC2128C-M33S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 33S

SC2128C-M34D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 34D

SC2128C-M34S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 34S

SC2128C-M40D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 40D

SC2128C-M40S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 40S

SC2128C-M41D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 41D

SC2128C-M41S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 41S

SC2128C-M42D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 42D

SC2128C-M42S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 42S

SC2128C-M43D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 43D

SC2128C-M43S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 43S

SC2128C-M44D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 44D

SC2128C-M44S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 44S

SC2128C-M50D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 50D

SC2128C-M50S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 50S

SC2128C-M51D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 51D

SC2128C-M51S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 51S

SC2128C-M52D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 52D

SC2128C-M52S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 52S

SC2128C-M53D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 53D

SC2128C-M53S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 53S

SC2128C-M54D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 54D

SC2128C-M54S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 54S

SC2128C-M80D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 80D

SC2128C-M80S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 80S

SC2128C-M81D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 81D

SC2128C-M81S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 81S

SC2128C-M82D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 82D

SC2128C-M82S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 82S

SC2128C-M83D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 83D

SC2128C-M83S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 83S

SC2128C-M84D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 84D

SC2128C-M84S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 84S

SC2128C-M90D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 90D

SC2128C-M90S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 90S

SC2128C-M91D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 91D

SC2128C-M91S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 91S

SC2128C-M92D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 92D

SC2128C-M92S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 92S

SC2128C-M93D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 93D

SC2128C-M93S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 93S

SC2128C-M94D : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 94D

SC2128C-M94S : Remote Fan Control ic For Electronic Fan Application
SC 2128 C-M 94S

SC22203440 : Mis Chip Capacitors
SC 22203440

SC23-11EWA : Material: GAASp/gap , Wavelength: 625nm
SC 23-11 EWA

SC23-11GWA : Material: Gap , Wavelength: 568nm
SC 23-11 GWA

SC23-11SRWA : Material: Gaaias , Wavelength: 640nm
SC 23-11 SRWA

SC23-11YWA : Material: GAASp/gap , Wavelength: 588nm
SC 23-11 YWA

SC23-12EWA : Material: GAASp/gap , Wavelength: 625nm
SC 23-12 EWA

SC23-12EWADMP3.8222 : Led Display 2.24" he Red
SC 23-12 EWADMP 3.8222

SC23-12GWA : Material: Gap , Wavelength: 568nm
SC 23-12 GWA

SC23-12SGWADMP3.6328 : Led Display 2.24" Green
SC 23-12 SGWADMP 3.6328

SC23-12SRWA : Material: Gaaias , Wavelength: 640nm
SC 23-12 SRWA

SC23-12SRWADMP5.5498 : Led Display 2.24" Red
SC 23-12 SRWADMP 5.5498

SC23-12YWA : Material: GAASp/gap , Wavelength: 588nm
SC 23-12 YWA

SC23-12YWADMP3.8222 : Led Display 2.24" Yellow
SC 23-12 YWADMP 3.8222

SC2402A : Display Format = 24 X 2 ;; Model Size WXHXD (mm) = 118 X 36 X 8.8 (12.7) ;; View
SC 2402A

SC2420 : Bi-phase/dual Controller
SC 2420

SC2422A : Bi-phase Current Mode Controller
SC 2422A

SC2422A.EVB : Bi-phase Current Mode Controller
SC 2422 A.EVB

SC2422ACS.TR : Bi-phase Current Mode Controller
SC 2422 ACS.TR

SC2422ACSTR : Biphase Current Mode Controller
SC 2422 ACSTR

SC2422AEVB : Biphase Current Mode Controller
SC 2422 AEVB

SC2441 : Very Low Input Voltage 2-Phase Synchronous Step-down Controller With Step-up Con
SC 2441

SC2441 : Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Co
SC 2441

SC2441A : 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Convert
SC 2441A

SC2442 : High-performance Wide Input Range Dual Synchronous Buck Controller
SC 2442

SC2446A : Dual-Phase, Single or Dual Output Synchronous Step-Down Controller <<<>>>The SC2
SC 2446A

SC2446AITSTRT : Dual-Phase, Single or Dual Output Synchronous Step-Down Controller <<<>>>The SC2
SC 2446 AITSTRT

SC2449 : Bi-phase/dual Controller
SC 2449

SC2450 : Bi-phase/dual Controller
SC 2450

SC2453 : High-performance Quad-output Switching Regulator
SC 2453

SC2463 : High Performance Quad Output Switching Regulator<<<>>>The SC2463 is a high perfo
SC 2463

SC2516 : Complete Three-in-One DDR Power Solution With BF_CUT<<<>>>The SC2516 is a fully
SC 2516

SC2545 : High Performance Wide Input Range Dual Synchronous Buck Controller<<<>>>The SC25
SC 2545

SC2545MLTRT : High Performance Wide Input Range Dual Synchronous Buck Controller<<<>>>The SC25
SC 2545 MLTRT

SC2545TSTRT : High Performance Wide Input Range Dual Synchronous Buck Controller<<<>>>The SC25
SC 2545 TSTRT

SC2595 : Integrated Linear DDR Termination Regulator
SC 2595

SC2602 : Synchronous Voltage Mode Controller for Distributed Power Supply Applications<<<
SC 2602

SC2602A : Synchronous Voltage Mode Controller for Distributed Power Supply Applications<<<
SC 2602A

SC2602L : Synchronous Voltage Mode Controller for Distributed Power Supply<<<>>><<<>>>The
SC 2602L

SC2602STRT : Synchronous Voltage Mode Controller for Distributed Power Supply Applications<<<
SC 2602 STRT

SC2602STRT : Synchronous Voltage Mode Controller for Distributed Power Supply Applications<<<
SC 2602 STRT

SC2603 : Simple PWM Boost Controller<<<>>><<<>>>The SC2603 is a versatile, low-cost, volt
SC 2603

SC2608 : Simple, Synchronous Voltage Mode PWM Controller <<<>>>The SC2608 is a versatile
SC 2608

SC2608STRT : Simple, Synchronous Voltage Mode PWM Controller <<<>>>The SC2608 is a versatile
SC 2608 STRT

SC2610 : 600 KHz/1 MHZ Step-down DC/DC Converter
SC 2610

SC2611 : 600 KHZ / 1 MHZ Step-down DC/DC Converter
SC 2611

SC2612 : 600 KHz/200 KHZ Step-down DC/DC Converter
SC 2612

SC2616 : Complete DDR Power Solution
SC 2616

SC2618 : Miniature PWM Controller for Buck Regulator<<<>>>The SC2618 is a hysteretic mode
SC 2618

SC2621 : 500kHz Voltage Mode PWM Controller With Linear Power Regulator<<<>>>The SC2621 p
SC 2621

SC2621STRT : 500kHz Voltage Mode PWM Controller With Linear Power Regulator<<<>>>The SC2621 p
SC 2621 STRT

SC2642 : Multi-platform Two-phase PWM Controller
SC 2642

SC2643VX : Combi-Sense™ Multi-platform Multi-phase PWM Controller
SC 2643 VX

SC2643VX : Multi-Platform Multi-Phase PWM Controller<<<>>><<<>>>The SC2643VX provides a sol
SC 2643 VX

SC2646B : 2, 3 or 4 Phase Combi-SenseTM PWM Controller<<<>>><<<>>>The SC2646B controller p
SC 2646B

SC2647 : Combi-Sense™ Multi-platform Multi-phase PWM Controller
SC 2647

SC2672 : Dual Synchronous Voltage-mode Controller
SC 2672

SC26C198 : SC26C198; SC68C198; SC26L198; SC68L198; Octal Uart With TTL Compatibility at 3.3
SC 26 C 198

SC26C198A1A : SC26C198; SC68C198; SC26L198; SC68L198; Octal Uart With TTL Compatibility at 3.3
SC 26 C 198 A 1A

SC26C198C1A : SC26C198; SC68C198; SC26L198; SC68L198; Octal Uart With TTL Compatibility at 3.3
SC 26 C 198 C 1A

SC26C562 : SC26C562; CMOS Dual Universal Serial Communications Controller (CDUSCC)
SC 26 C 562

SC26C562A8A : SC26C562; CMOS Dual Universal Serial Communications Controller (CDUSCC)
SC 26 C 562 A 8A

SC26C562C1A : SC26C562; CMOS Dual Universal Serial Communications Controller (CDUSCC)
SC 26 C 562 C 1A

SC26C562C1N : SC26C562; CMOS Dual Universal Serial Communications Controller (CDUSCC)
SC 26 C 562 C 1N

SC26C92 : SC26C92; Dual Universal Asynchronous Receiver/transmitter (DUART)
SC 26 C 92

SC26C92A1A : SC26C92; Dual Universal Asynchronous Receiver/transmitter (DUART);; Package: SOT
SC 26 C 92 A 1A

SC26C92A1B : SC26C92; Dual Universal Asynchronous Receiver/transmitter (DUART);; Package: SOT
SC 26 C 92 A 1B

SC26C92A1N : SC26C92; Dual Universal Asynchronous Receiver/transmitter (DUART);; Package: SOT
SC 26 C 92 A 1N

SC26C92C1A : SC26C92; Dual Universal Asynchronous Receiver/transmitter (DUART)
SC 26 C 92 C 1A

SC26C92C1B : SC26C92; Dual Universal Asynchronous Receiver/transmitter (DUART)
SC 26 C 92 C 1B

SC26C92C1N : SC26C92; Dual Universal Asynchronous Receiver/transmitter (DUART)
SC 26 C 92 C 1N

SC26C94 : SC26C94; Quad Universal Asynchronous Receiver/transmitter (QUART)
SC 26 C 94

SC26C94A1A : SC26C94; Quad Universal Asynchronous Receiver/transmitter (QUART)
SC 26 C 94 A 1A

SC26C94A1N : SC26C94; Quad Universal Asynchronous Receiver/transmitter (QUART)
SC 26 C 94 A 1N

SC26C94C1A : SC26C94; Quad Universal Asynchronous Receiver/transmitter (QUART)
SC 26 C 94 C 1A

SC26C94C1N : SC26C94; Quad Universal Asynchronous Receiver/transmitter (QUART)
SC 26 C 94 C 1N

SC26L198 : SC26C198; SC68C198; SC26L198; SC68L198; Octal Uart With TTL Compatibility at 3.3
SC 26 L 198

SC26L198A1A : SC26C198; SC68C198; SC26L198; SC68L198; Octal Uart With TTL Compatibility at 3.3
SC 26 L 198 A 1A

SC26L198C1A : SC26C198; SC68C198; SC26L198; SC68L198; Octal Uart With TTL Compatibility at 3.3
SC 26 L 198 C 1A

SC2738 : Ultra Low Output Voltage Dual Linear FET Controller<<<>>>The SC2738 is an ultra
SC 2738

SC2738IMSTRT : Ultra Low Output Voltage Dual Linear FET Controller<<<>>>The SC2738 is an ultra
SC 2738 IMSTRT

SC28C198A1A : Octal Uart For 3.3V And 5V Supply Voltage
SC 28 C 198 A 1A

SC28C198C1A : Octal Uart For 3.3V And 5V Supply Voltage
SC 28 C 198 C 1A

SC28C94 : SC28C94; Quad Universal Asynchronous Receiver/transmitter (QUART)
SC 28 C 94

SC28C94A1A : SC28C94; Quad Universal Asynchronous Receiver/transmitter (QUART);; Package: SOT
SC 28 C 94 A 1A

SC28C94A1N : SC28C94; Quad Universal Asynchronous Receiver/transmitter (QUART);; Package: SOT
SC 28 C 94 A 1N

SC28L194 : SC28L194; Quad Uart For 3.3V And 5V Supply Voltage
SC 28 L 194

SC28L194A1A : SC28L194; Quad Uart For 3.3V And 5V Supply Voltage;; Package: SOT188-3 (PLCC68)
SC 28 L 194 A 1A

SC28L194A1BE : SC28L194; Quad Uart For 3.3V And 5V Supply Voltage;; Package: SOT315-1 (LQFP80)
SC 28 L 194 A 1 BE

SC28L194C1A : SC28L194; Quad Uart For 3.3V And 5V Supply Voltage
SC 28 L 194 C 1A

SC28L194C1BE : SC28L194; Quad Uart For 3.3V And 5V Supply Voltage
SC 28 L 194 C 1 BE

SC28L198 : SC28L198; Octal Uart For 3.3V And 5V Supply Voltage
SC 28 L 198

SC28L198A1A : SC28L198; Octal Uart For 3.3V And 5V Supply Voltage;; Package: SOT189-3 (PLCC84)
SC 28 L 198 A 1A

SC28L198A1BE : SC28L198; Octal Uart For 3.3V And 5V Supply Voltage;; Package: SOT407-1 (LQFP100
SC 28 L 198 A 1 BE

SC28L198C1A : SC28L198; Octal Uart For 3.3V And 5V Supply Voltage
SC 28 L 198 C 1A

SC28L201 : 3.3 V, 5 V UART, 3.125 Mbit/s, with 256-byte FIFO<<<>>><<<>>>The SC28L201 is a h
SC 28 L 201

SC28L201A1DGG : 3.3 V, 5 V UART, 3.125 Mbit/s, with 256-byte FIFO<<<>>><<<>>>The SC28L201 is a h
SC 28 L 201 A 1 DGG

SC28L202 : SC28L202; Dual Universal Asynchronous Receiver/transmitter (DUART)
SC 28 L 202

SC28L202A1B : SC28L202; Dual Universal Asynchronous Receiver/transmitter (DUART)
SC 28 L 202 A 1B

SC28L202A1D : SC28L202; Dual Universal Asynchronous Receiver/transmitter (DUART)
SC 28 L 202 A 1D

SC28L91 : SC28L91; 3.3V-5.0V Universal Asynchronous Receiver/transmitter (UART)
SC 28 L 91

SC28L91A1A : SC28L91; 3.3V-5.0V Universal Asynchronous Receiver/transmitter (UART)
SC 28 L 91 A 1A

SC28L91A1B : SC28L91; 3.3V-5.0V Universal Asynchronous Receiver/transmitter (UART)
SC 28 L 91 A 1B

SC28L92 : SC28L92; 3.3V-5.0V Dual Universal Asynchronous Receiver/transmitter (DUART)
SC 28 L 92

SC28L92A1A : SC28L92; 3.3V-5.0V Dual Universal Asynchronous Receiver/transmitter (DUART);; Pa
SC 28 L 92 A 1A

SC28L92A1B : SC28L92; 3.3V-5.0V Dual Universal Asynchronous Receiver/transmitter (DUART);; Pa
SC 28 L 92 A 1B

SC2982 : 50 ma Ultra-low Dropout, Low-noise Micropower Linear Regulator
SC 2982

SC2982CSK-1.8.TR : 50 ma Ultra-low Dropout, Low-noise Micropower Linear Regulator
SC 2982 CSK-1.8.TR

SC2982CSK-1.8TR : 50ma Ultra Low Dropout, Low Noise Micropower Linear Regulator
SC 2982 CSK-1.8 TR

SC2982CSK-2.5.TR : 50 ma Ultra-low Dropout, Low-noise Micropower Linear Regulator
SC 2982 CSK-2.5.TR

SC2982CSK-2.5TR : 50ma Ultra Low Dropout, Low Noise Micropower Linear Regulator
SC 2982 CSK-2.5 TR

SC2982CSK-2.8.TR : 50 ma Ultra-low Dropout, Low-noise Micropower Linear Regulator
SC 2982 CSK-2.8.TR

SC2982CSK-2.8TR : 50ma Ultra Low Dropout, Low Noise Micropower Linear Regulator
SC 2982 CSK-2.8 TR

SC2982CSK-3.0.TR : 50 ma Ultra-low Dropout, Low-noise Micropower Linear Regulator
SC 2982 CSK-3.0.TR

SC2982CSK-3.0TR : 50ma Ultra Low Dropout, Low Noise Micropower Linear Regulator
SC 2982 CSK-3.0 TR

SC2982CSK-3.3.TR : 50 ma Ultra-low Dropout, Low-noise Micropower Linear Regulator
SC 2982 CSK-3.3.TR

SC2982CSK-3.3TR : 50ma Ultra Low Dropout, Low Noise Micropower Linear Regulator
SC 2982 CSK-3.3 TR

SC2982CSK-3.6.TR : 50 ma Ultra-low Dropout, Low-noise Micropower Linear Regulator
SC 2982 CSK-3.6.TR

SC2982CSK-3.6TR : 50ma Ultra Low Dropout, Low Noise Micropower Linear Regulator
SC 2982 CSK-3.6 TR

SC2982CSK-3.8.TR : 50 ma Ultra-low Dropout, Low-noise Micropower Linear Regulator
SC 2982 CSK-3.8.TR

SC2982CSK-3.8TR : 50ma Ultra Low Dropout, Low Noise Micropower Linear Regulator
SC 2982 CSK-3.8 TR

SC2982CSK-4.0.TR : 50 ma Ultra-low Dropout, Low-noise Micropower Linear Regulator
SC 2982 CSK-4.0.TR

SC2982CSK-4.0TR : 50ma Ultra Low Dropout, Low Noise Micropower Linear Regulator
SC 2982 CSK-4.0 TR

SC2982CSK-5.0.TR : 50 ma Ultra-low Dropout, Low-noise Micropower Linear Regulator
SC 2982 CSK-5.0.TR

SC2982CSK-5.0TR : 50ma Ultra Low Dropout, Low Noise Micropower Linear Regulator
SC 2982 CSK-5.0 TR

SC2999 : NPN Epitaxial Planar Silicon Transistor ( HF Amp Applications )
SC 2999

SC3 : 50 X 50 Nicr on Silicon
SC3

SC3010 : Infrared Remote Control Transmitter For General Purpose Infrared Applications
SC 3010

SC3010S : Infrared Remote Control Transmitter For General Purpose Infrared Applications
SC 3010S

SC3011B : Frequency = 600.0 ;; Description = Clock, Diff Sine Wave, Tol = 200ppm, VCC=3.3
SC 3011B

SC3015B : Frequency = 550.0 ;; Description = Clock, Diff Sine Wave, Tol = 200ppm, VCC=3.3
SC 3015B

SC3017B : Frequency = 400.0 ;; Description = Clock, Diff Sine Wave, Tol = 200ppm, VCC=3.3
SC 3017B

SC3018B : Frequency = 250.0 ;; Description = Clock, Diff Sine Wave, Tol = 200ppm, VCC=3.3
SC 3018B

SC3019B : Frequency = 500.0 ;; Description = Clock, Diff Sine Wave, Tol = 200ppm, VCC=3.3
SC 3019B

SC3027B : Frequency = 380.0 ;; Description = Clock, Diff Sine Wave, Tol = 200ppm, VCC=3.3
SC 3027B

SC3028B : Frequency = 266.667 ;; Description = Clock, Diff Sine Wave, Tol = 200ppm, VCC=3.
SC 3028B

SC3029B : Frequency = 360.0 ;; Description = Clock, Diff Sine Wave, Tol = 200ppm, VCC=3.3
SC 3029B

SC3031B : Frequency = 390.0 ;; Description = Clock, Diff Sine Wave, Tol = 200ppm, VCC=3.3
SC 3031B

SC3035B-1 : Frequency = 800.0 ;; Description = Clock, Diff Sine Wave, Tol = 250ppm, VCC=3.3
SC 3035 B-1

SC3037B : Frequency = 350.0 ;; Description = Clock, Diff Sine Wave, Tol = 200ppm, VCC=3.3
SC 3037B

SC3038B : Frequency = 532.0 ;; Description = Clock, Diff Sine Wave, Tol = 200ppm, VCC=3.3
SC 3038B

SC3039B : Frequency = 286.0 ;; Description = Clock, Diff Sine Wave, Tol = 200ppm, VCC=3.3
SC 3039B

SC3040B : Frequency = 400.0 ;; Description = Clock, Diff Sine Wave, Tol = 200ppm, VCC=3.3
SC 3040B

SC3041B : Frequency = 300.0 ;; Description = Clock, Diff Sine Wave, Tol = 200ppm, VCC=3.3
SC 3041B

SC3048B : Frequency = 444.0 ;; Description = Clock, Diff Sine Wave, Tol = 200ppm, VCC=3.3
SC 3048B

SC3072-002 : 3-cell, Lithium-ion SaFETy Circuit, 2-sided PCBa
SC 3072-002

SC310 : High-Side Current-Sense Amplifier with Low Impedance Voltage Output <<<>>>The SC
SC 310

SC310XSKTRT : High-Side Current-Sense Amplifier with Low Impedance Voltage Output <<<>>>The SC
SC 310 XSKTRT

 
0-C     D-L     M-R     S-Z