Name: CD74HCT14M
Brand: Texas Instruments
SKU: CD74HCT14M
Price: 0.9806 USD
Availability: InStock
Rating: 5 (115 reviews)

CD74HCT14M

Solo por referencia

Nº de pieza	CD74HCT14M
Fabricantes	Texas Instruments
Descripción	IC HEX SCHMITT-TRIG INV 14-SOIC
Hoja de datos
Paquete	14-SOIC (0.154", 3.90mm Width)
ECAD
En existencias	10.212 piece(s)
Precio unitario	$ 0,9806 *
Plazo de ejecución	Se puede enviar inmediatamente
Tiempo estimado de entrega	dic 6 - dic 11 (Elija envío expedito)
Pedir presupuesto

Métodos de pago
Servicios de entrega

Estamos ofreciendo CD74HCT14M por precios competitivos en el mercado mundial, por favor nos envíe una solicitud de cuotas para la fijación de precios. ¡Gracias!
Para procesar su RFQ, por favor agregue CD74HCT14M con la cantidad en la BOM. Heisener.com no requiere ningún tipo de registro para solicitar una cotización de CD74HCT14M.

Especificaciones CD74HCT14M

Fabricantes	Texas Instruments
Categoría	Circuitos integrados - Lógica - Compuertas e inversores
Paquete	14-SOIC (0.154", 3.90mm Width)
ECAD
Serie	74HCT
Tipo de lógica	Inverter
Cantidad de circuitos	6
Número de entradas	6
Caracteristicas	Schmitt Trigger
Suministro de voltaje	4.5 V ~ 5.5 V
Actual - Quiescente (Máx)	2µA
Corriente - Salida alta, baja	4mA, 4mA
Nivel lógico - bajo	0.5 V ~ 0.6 V
Nivel lógico - Alto	1.9 V ~ 2.1 V
Retraso máximo de propagación @ V, Max CL	38ns @ 4.5V, 50pF
Temperatura de funcionamiento	-55°C ~ 125°C
Tipo de montaje	Surface Mount
Paquete de dispositivo del proveedor	14-SOIC
Paquete / caja	14-SOIC (0.154", 3.90mm Width)

CD74HCT14M Packaging

CD74HCT14M FAQ

1. How to order CD74HCT14M on Heisener?

Currently, Heisener only provide peer-to-peer order processing. While you submit the RFQ, our professional agent will contact you with the competitive prices in the global market, and our agent will prompt you to finish the order if you accept our offers.
2. How does Heisener guarantee that CD74HCT14M is from the original manufacturer or authorized agents?

We have a professional and experienced quality control team to strictly verify and test the CD74HCT14M. All suppliers must pass our qualification reviews before they can publish their products including CD74HCT14M on Heisener; we pay more attention to the channels and quality of CD74HCT14M products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
3. Are the CD74HCT14M price and inventory displayed accurate?

The price and inventory of CD74HCT14M fluctuates frequently and cannot be updated in time, it will be updated periodically within 24 hours. And, our quotation usually expires after 5 days.
4. What forms of payment are accepted?

Wire Transfer, PayPal, Alipay, Wechat, Credit Card, Western Union, MoneyGram, and Escrow are all acceptable.

Warm Tips: Some orders in certain payment forms may require handling fee.
5. How is the shipping arranged?

Customers can choose industry-leading freight companies, including DHL, UPS, FedEx, TNT, and Registered Mail. Shipping insurance is also available.

Once your order has been processed for shipment, our salesperson will send you an email advising you of the shipping status and tracking number.

Warm Tips: It may take up to 24 hours for the carriers to display tracking information. Usually, express delivery takes 3-5 days, and registered mail takes 25-60 days.
6. What is the process for return or replacement of CD74HCT14M?

All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the CD74HCT14M we delivered, we will accept the replacement or return of the CD74HCT14M only when all of the below conditions are fulfilled:

(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.

(2)We are informed of the defect described above within 90 days after the delivery of CD74HCT14M.

(3)The PartNo is unused and only in the original unpacked packaging.

Two processes to return the products:

(1)Inform us within 90 days

(2)Obtain Requesting Return Authorizations
7.How to contact us to get technical supports, such as CD74HCT14M pin diagram, CD74HCT14M datasheet?

If you need any after-sales service, please do not hesitate to contact us.

CD74HCT14M Productos Relacionados

DSC6003JI1A-PROGRAMMABLE	Microchip Technology, PROG OSC 1MHZ-80MHZ CMOS, 4-SMD, No Lead, 74HCT	Ver
SIT1602BC-23-33E-74.175824D	SiTime, -20 TO 70C, 3225, 50PPM, 3.3V, 7, -, 74HCT	Ver
T350A105J035AT7301	KEMET, CAP TANT 1UF 5% 35V RADIAL, Radial, 74HCT	Ver
SS1FL3HM3/I	Vishay Semiconductor Diodes Division, DIODE SCHOTTKY 30V 1A DO-219AB, DO-219AB, 74HCT	Ver
FSQ500N	Fairchild/ON Semiconductor, IC PWM/SENSEFET 130KHZ 8DIP, 8-DIP (0.300", 7.62mm), 74HCT	Ver
25LC128T-E/SN	Microchip Technology, IC EEPROM 128KBIT 10MHZ 8SOIC, 8-SOIC (0.154", 3.90mm Width), 74HCT	Ver
EP2C70F672I8	Altera, IC FPGA 422 I/O 672FBGA, 672-BGA, 74HCT	Ver
OVFSRAC8	TT Electronics/Optek Technology, LED RED CLEAR 4DIP THROUGH HOLE, 4-DIP (0.200", 5.08mm), 74HCT	Ver
5-104656-3	TE Connectivity AMP Connectors, CONN HEADER 30POS .050 VERT SMD, -, 74HCT	Ver
15-04-0211	Molex Connector Corporation, POLARIZING KEY FOR .100 HOUSINGS, -, 74HCT	Ver
DWM-10-60-G-S-500	Samtec Inc., .050" BOARD SPACERS, -, 74HCT	Ver
PVB3-D48-S15-D	CUI Inc., DC/DC CONVERTER 15V 200MA 3W, 24-DIP Module, 10 Leads, 74HCT	Ver

CD74HCT14M Garantías

Garantias de servicio

Garantizamos el 100% de satisfacción del cliente.

Nuestro experimentado equipo de ventas y nuestro equipo de soporte técnico respaldan nuestros servicios para satisfacer a todos nuestros clientes.

Garantias de calidad

Ofrecemos 90 días de garantía.

Si los artículos que recibió no tenían la calidad perfecta, seremos responsables de su reembolso o reemplazo, pero los artículos deben devolverse en su estado original.

Cadenas de suministro globales: recursos para distribuidores confiables y autorizados

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HCT14MT D# V36:1790_07247106	Texas Instruments	Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC T/R RoHS: Compliant	0
CD74HCT14M D# V99:2348_07247091	Texas Instruments	Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC Tube RoHS: Compliant	0
CD74HC14M D# V99:2348_07242188	Texas Instruments	Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC Tube RoHS: Compliant	0
CD74HCT14M96 D# V72:2272_07247094	Texas Instruments	Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC T/R RoHS: Compliant	0

Nº de pieza

Fabricantes

Descripción

En existencias

CD74HC14M

D# CD74HC14M

Texas Instruments

Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC Tube - Bulk (Alt: CD74HC14M)

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HCT14MG4	Texas Instruments		299
CD74HCT14M	Harris Semiconductor		40
CD74HCT14M96	Texas Instruments		1770
CD74HCT14M96E4	Texas Instruments		1676
CD74HC14M	Texas Instruments		163

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HC14M	Texas Instruments	14 LEAD SOIC(150MIL) - Tape and Reel	0
CD74HCT14M	RCA	IC Date Code: 8927	17
CD74HCT14MTE4	Texas Instruments	Buffer Logic IC, Leaded Process Compatible:Yes, Logic Family:HCT, No. of Pins:14, Operating Temperature Range:-55C to +125C, Package/Case:14-SOIC, Peak Reflow Compatible (260 C):Yes , RoHS Compliant: Yes	0
CD74HCT14M96E4	Texas Instruments	IC HEX SCHMITT-TRIG INV 14SOIC	0
CD74HCT14M96	Texas Instruments	14 LEAD SOIC(150MIL) - Tape and Reel	5000
CD74HCT14MTG4	Texas Instruments	HEX INVERTER, SCHMITT TRIGGER SOIC-14, Logic Type:Inverter Schmitt Trigger, Output Current:4mA, No. of Inputs:1, Supply Voltage Min:4.5V, Supply Voltage Max:5.5V, Logic Case Style:SOIC, No. of Pins:14, Operating Temperature Min:-55C, RoHS Compliant: Yes	0
CD74HCT14MG4	Texas Instruments	Buffer Logic IC, Leaded Process Compatible:Yes, Logic Family:HCT, No. of Pins:14, Operating Temperature Range:-55C to +125C, Package/Case:14-SOIC, Peak Reflow Compatible (260 C):Yes , RoHS Compliant: Yes	0
CD74HCT14ME4	Texas Instruments	IC HEX SCHMITT-TRIG INV 14SOIC	0
CD74HCT14M96G4	Texas Instruments	IC HEX SCHMITT-TRIG INV 14SOIC	0
CD74HCT14MT	Texas Instruments	HEX INVERTER, SCHMITT TRIGGER SOIC-14, FULL REEL, Logic Type:Inverter Schmitt Trigger, Output Current:4mA, No. of Inputs:1, Supply Voltage Min:4.5V, Supply Voltage Max:5.5V, Logic Case Style:SOIC, No. of Pins:14, Family Type:HCT , RoHS Compliant: Yes	0

Nº de pieza

Fabricantes

Descripción

En existencias

CD74HCT14M

D# C1S746203719454

Texas Instruments

Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC Tube

RoHS: Compliant

pbFree: Yes

Min Qty: 1

Container: Tube

CD74HC14M

D# C1S746201344308

Texas Instruments

Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC Tube

RoHS: Compliant

pbFree: Yes

Min Qty: 5

315

Nº de pieza

Fabricantes

Descripción

En existencias

CD74HCT14M

Texas Instruments

SOIC-14 Gates and Inverters RoHS

CD74HCT14M96

Texas Instruments

SOIC-14 Gates and Inverters RoHS

4895

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HCT14M96G4 D# CD74HCT14M96G4-ND	Texas Instruments	IC INVERT SCHMITT 6CH 6IN 14SOIC	0
CD74HCT14M D# 296-9253-5-ND	Texas Instruments	IC INVERT SCHMITT 6CH 6IN 14SOIC	2396
CD74HCT14M96 D# 296-14548-1-ND	Texas Instruments	IC INVERT SCHMITT 6CH 6IN 14SOIC	7733
CD74HCT14M96E4 D# CD74HCT14M96E4-ND	Texas Instruments	IC INVERT SCHMITT 6CH 6IN 14SOIC	0
CD74HCT14MT D# 296-CD74HCT14MTCT-ND	Texas Instruments	IC INVERT SCHMITT 6CH 6IN 14SOIC	948
CD74HC14M D# 296-9179-5-ND	Texas Instruments	IC INVERT SCHMITT 6CH 6IN 14SOIC	2566

Nº de pieza

Fabricantes

Descripción

En existencias

CD74HCT14M

Texas Instruments

In stock shipping within 2days

200

CD74HCT14M96

Texas Instruments

In stock shipping within 2days

709

Nº de pieza

Fabricantes

Descripción

En existencias

CD74HC14M

D# 3006455

Texas Instruments

IC, INVERTER, 1I/P, 14SOIC

RoHS: Compliant

Min Qty: 1

Container: Each

5297

CD74HCT14M

D# 3120226

Texas Instruments

74HCT CMOS, SMD, 74HCT14, SOIC14

RoHS: Compliant

Min Qty: 1

Container: Each

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HCT14M	Texas Instruments	NEW AND ORGINAL. ISRAEL W.HOUSE	4506
CD74HCT14M96	TEXAS1	NEW AND ORGINAL. ISRAEL W.HOUSE	1683
CD74HCT14M96G4	TEXAS2	NEW AND ORGINAL. ISRAEL W.HOUSE	1683

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HCT14MX	Harris Semiconductor	OEM/CM QUOTES ONLY \| NO BROKERS	150
CD74HCT14M96G4	Texas Instruments	OEM/CM QUOTES ONLY \| NO BROKERS	10
CD74HC14M	Harris Semiconductor	OEM/CM QUOTES ONLY \| NO BROKERS	4399
CD74HCT14M96E4	Texas Instruments	OEM/CM QUOTES ONLY \| NO BROKERS	1927
TISCD74HCT14M	UNKNOWN	OEM/CM QUOTES ONLY \| NO BROKERS	44
CD74HCT14M	TEXAS INSTRUMENTS	OEM/CM QUOTES ONLY \| NO BROKERS	2875
CD74HCT14M96	HARRIS SEMICONDUCTOR	OEM/CM QUOTES ONLY \| NO BROKERS	10849
CD74HCT14MG4	Texas Instruments	OEM/CM QUOTES ONLY \| NO BROKERS	1725
CD74HCT14MTR	TEXAS INSTRUMENTS	OEM/CM QUOTES ONLY \| NO BROKERS	288

Nº de pieza	Fabricantes	Descripción	En existencias
I0TINCD74HCT14M96	Texas Instruments	OEM/CM ONLY	167
CD74HCT14MTE4	Texas Instruments	OEM/CM ONLY	627
CD74HCT14M96G4	Texas Instruments	OEM/CM ONLY	546
CD74HCT14M	NXP Semiconductors	OEM/CM ONLY	1063
CD74HCT14MG4	Texas Instruments	OEM/CM ONLY	941
CD74HCT14MHARRIS9	Texas Instruments	OEM/CM ONLY	1703
CD74HCT14M96	Texas Instruments	OEM/CM ONLY	730
CD74HCT14MSO14	Texas Instruments	OEM/CM ONLY	552
CD74HCT14M96DC0331	Texas Instruments	OEM/CM ONLY	730
CD74HCT14M96E4	Texas Instruments	OEM/CM ONLY	704
CD74HCT14M74HCT14M	Texas Instruments	OEM/CM ONLY	14063
CD74HCT14MDC0331	Texas Instruments	OEM/CM ONLY	259
CD74HCT14MT	Texas Instruments	OEM/CM ONLY	1067
CD74HCT14MTR	Texas Instruments	OEM/CM ONLY	322
CD74HCT14ME4	Texas Instruments	OEM/CM ONLY	919
CD74HC14M	Texas Instruments	OEM/CM ONLY	1086

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HC14M	Texas Instruments	In stock	29
CD74HCT14M96	Texas Instruments	In stock	1179
CD74HCT14M96E4	Texas Instruments	In stock	1676

Nº de pieza

Fabricantes

Descripción

En existencias

CD74HCT14M

D# C553162

Texas Instruments

CD74HCT14M96

D# C469842

Texas Instruments

4895

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HC14M	Texas Instruments	OEM/CM Immediate delivery	40
CD74HCT14M	Texas Instruments	OEM/CM Immediate delivery	800
CD74HCT14M96	Texas Instruments	OEM/CM Immediate delivery	353

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HCT14MT D# 595-CD74HCT14MT	Texas Instruments	Inverters Hi-Sp CMOS Logic Hex Schmitt-Trig Inv RoHS: Compliant	450
CD74HCT14M96E4 D# 595-CD74HCT14M96E4	Texas Instruments	Inverters Hi-Sp CMOS Logic Hex Schmitt-Trig Inv RoHS: Compliant	2168
CD74HC14M D# 595-CD74HC14M	Texas Instruments	Inverters Hex Schmitt Trigger RoHS: Compliant	2466
CD74HCT14MG4 D# 595-CD74HCT14MG4	Texas Instruments	Inverters Hi-Sp CMOS Logic Hex Schmitt-Trig Inv RoHS: Compliant	1700
CD74HCT14M96 D# 595-CD74HCT14M96	Texas Instruments	Inverters Hex Schmitt-Trigger RoHS: Compliant	2656

Nº de pieza

Fabricantes

Descripción

En existencias

CD74HC14M

D# 28AH2062

Texas Instruments

IC, INVERTER, 1I/P, 14SOIC, Logic Family / Base Number:74HC14, Logic Type:Inverter, Output Current:5.2mA, No. of Inputs:1, Supply Voltage Min:2V, Supply Voltage Max:6V, Logic Case Style:SOIC, No. of Pins:14Pins, Logic IC Family:74HC, RoHS Compliant: Yes

RoHS: Compliant

Min Qty: 1

Container: Bulk

5297

CD74HCT14M

D# 33AH3837

Texas Instruments

74HCT CMOS, SMD, 74HCT14, SOIC14, Logic Family / Base Number:74HCT14, Logic Type:Inverter, Output Current:4mA, No. of Inputs:1, Supply Voltage Min:4.5V, Supply Voltage Max:5.5V, Logic Case Style:SOIC, No. of Pins:14Pins, Logic IC RoHS Compliant: Yes

RoHS: Compliant

Min Qty: 1

Container: Bulk

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HCT14MTE4 D# NS-CD74HCT14MTE4	Texas Instruments	OEM/CM ONLY	7383
CD74HCT14M96G4 D# NS-CD74HCT14M96G4	Texas Instruments	OEM/CM ONLY	4358
CD74HCT14M D# NS-CD74HCT14M	Texas Instruments	OEM/CM ONLY	5372
CD74HC14M D# NS-CD74HC14M	Texas Instruments	OEM/CM ONLY	6624
CD74HCT14MTG4 D# NS-CD74HCT14MTG4	Texas Instruments	OEM/CM ONLY	9168
CD74HCT14M96E4 D# NS-CD74HCT14M96E4	Texas Instruments	OEM/CM ONLY	5863
CD74HCT14MT D# NS-CD74HCT14MT	Texas Instruments	OEM/CM ONLY	9436
CD74HCT14M96 D# NS-CD74HCT14M96	Texas Instruments	OEM/CM ONLY	3540
CD74HCT14ME4 D# NS-CD74HCT14ME4	Texas Instruments	OEM/CM ONLY	7691
CD74HCT14MG4 D# NS-CD74HCT14MG4	Texas Instruments	OEM/CM ONLY	4217

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HCT14M96	Texas Instruments	Logic Circuit, HEX Inverter, HCT-CMOS, 14 Pin, Plastic, SOP	7144
CD74HCT14MG4	Texas Instruments		239
CD74HCT14M96G4	Texas Instruments	IC,LOGIC GATE,HEX INVERTER,HCT-CMOS,SOP,14PIN,PLASTIC, TandR, LEAD FREE	9
CD74HC14M	Harris Semiconductor	Logic Circuit, HEX Inverter, HC-CMOS, 14 Pin, Plastic, SOP	50
CD74HCT14M	Texas Instruments	Logic Circuit, HEX Inverter, HCT-CMOS, 14 Pin, Plastic, SOP	961

Nº de pieza

Fabricantes

Descripción

En existencias

CD74HC14M

D# 6630051

Texas Instruments

Texas Instruments CD74HC14M Hex Schmitt Trigger Inverter, 14-Pin SOIC, PK

Min Qty: 5

Container: Package

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HCT14M96	Texas Instruments	CD74HCT14 High Speed CMOS Logic Hex Schmitt-Triggered Inverters RoHS: Compliant	9050
CD74HCT14MT	Texas Instruments	CD74HCT14 High Speed CMOS Logic Hex Schmitt-Triggered Inverters RoHS: Compliant	4250
CD74HC14M	Texas Instruments	CD74HC14 High Speed CMOS Logic Hex Schmitt-Triggered Inverters RoHS: Compliant	21
CD74HCT14M	Texas Instruments	CD74HCT14 High Speed CMOS Logic Hex Schmitt-Triggered Inverters RoHS: Compliant	13150

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HCT14MTR	Texas Instruments	OEM/CM ONLY	266
CD74HCT14MX	Harris Semiconductor	OEM/CM ONLY	146
CD74HCT14MG4	Texas Instruments	OEM/CM ONLY	3226
CD74HCT14M	Texas Instruments	OEM/CM ONLY	13341
TISCD74HCT14M	UNKNOWN	OEM/CM ONLY	53
CD74HCT14M96	Texas Instruments	OEM/CM ONLY	46932
CD74HCT14M96E4	Texas Instruments	OEM/CM ONLY	1692
CD74HC14M	Texas Instruments	OEM/CM ONLY	35359

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HCT14M96	Texas Instruments	IN stock Immediate delivery	348
CD74HC14M	Texas Instruments	IN stock Immediate delivery	35
CD74HCT14M	Texas Instruments	IN stock Immediate delivery	795

Nº de pieza

Fabricantes

Descripción

En existencias

CD74HCT14M

D# 2028019499

Texas Instruments

CD74HCT14M TI -

2500

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HCT14M96	Texas Instruments	6-ch, 4.5-V to 5.5-V inverters with Schmitt-Trigger inputs	48
CD74HC14M	Texas Instruments	6-ch, 2-V to 6-V inverters with Schmitt-Trigger inputs	12
CD74HCT14MT	Texas Instruments	6-ch, 4.5-V to 5.5-V inverters with Schmitt-Trigger inputs	10
CD74HCT14M	Texas Instruments	6-ch, 4.5-V to 5.5-V inverters with Schmitt-Trigger inputs	12

Nº de pieza

Fabricantes

Descripción

En existencias

CD74HCT14M96

SITI

shipping today

2496

CD74HC14M

Texas Instruments

shipping today

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HCT14M96 D# 51400243	Texas Instruments	Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC T/R RoHS: Compliant	0
CD74HCT14M D# 50853478	Texas Instruments	Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC Tube RoHS: Compliant	0
CD74HC14M D# 50476802	Texas Instruments	Inverter Schmitt Trigger 6-Element CMOS 14-Pin SOIC Tube RoHS: Compliant	0

Nº de pieza	Fabricantes	Descripción	En existencias
CD74HCT14MG4	Texas Instruments	RFQ	6464
CD74HC14M	Texas Instruments	RFQ	3017
CD74HCT14M96	mfr	RFQ	11111

Nº de pieza

Fabricantes

Descripción

En existencias

CD74HCT14M96

Texas Instruments

IC HEX SCHMT-TRG INVERTER 14SOIC

4600

Nº de pieza

Fabricantes

Descripción

En existencias

CD74HC14M

D# 3006455

Texas Instruments

IC, INVERTER, 1I/P, 14SOIC

RoHS: Compliant

Min Qty: 1

Container: Each

5297

CD74HCT14M

D# 3120226

Texas Instruments

74HCT CMOS, SMD, 74HCT14, SOIC14

RoHS: Compliant

Min Qty: 1

Container: Each

Quick Inquiry

CD74HCT14M

Calidad certificada

El compromiso de Heisener con la calidad ha dado forma a nuestros procesos de abastecimiento, prueba, envío y cada paso intermedio. Esta base subyace en cada componente que vendemos.

ISO9001:2015, ICAS, IAF, UKAS