Name: 74VHC138M
Brand: ON Semiconductor
SKU: 74VHC138M_1D8
Price: 1.3268 USD
Availability: InStock
Rating: 5 (68 reviews)

74VHC138M

Pour Référence Seulement

Référence	74VHC138M
Fabricant	ON Semiconductor
Description	IC DECODER/DEMUX 3-TO-8 16-SOIC
Fiche technique	74VHC138M Fiche technique
paquet	16-SOIC (0.154", 3.90mm Width)
ECAD
En stock	30 600 piece(s)
Prix unitaire	$ 1,3268 *
Délai de mise en œuvre	VÊtre confirmé
Temps de livraison estimé	déc. 1 - déc. 6 (Choisissez l'expédition accélérée)
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Méthodes de paiement
Services de livraison

Nous offrons 74VHC138M pour prix compétitif sur le marché mondial, s'il vous plaît envoyez-nous une demande de quota pour les prix. Merci!
Pour traiter votre demande de devis, s'il vous plaît ajouter 74VHC138M avec la quantité dans la nomenclature. Heisener.com Ne nécessite pas de toute inscription pour demander un devis de 74VHC138M.

Spécifications 74VHC138M

Fabricant	ON Semiconductor
Catégorie	Circuits intégrés (CI) - Logique - Commutateurs de signaux, multiplexeurs, décodeurs
paquet	16-SOIC (0.154", 3.90mm Width)
ECAD
Séries	74VHC
Type	Decoder/Demultiplexer
Circuit	1 x 3:8
Circuits Indépendants	1
Courant - Sortie haut, bas	8mA, 8mA
Source d'alimentation en tension	Single Supply
Tension - Alimentation	2 V ~ 5.5 V
Température de fonctionnement	-40°C ~ 85°C
Type de montage	Surface Mount
Paquet / cas	16-SOIC (0.154", 3.90mm Width)
Package de périphérique fournisseur	16-SOIC

74VHC138M fiche technique

74VHC138M Packaging

74VHC138M FAQ

1. How to order 74VHC138M 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 74VHC138M is from the original manufacturer or authorized agents?

We have a professional and experienced quality control team to strictly verify and test the 74VHC138M. All suppliers must pass our qualification reviews before they can publish their products including 74VHC138M on Heisener; we pay more attention to the channels and quality of 74VHC138M products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
3. Are the 74VHC138M price and inventory displayed accurate?

The price and inventory of 74VHC138M 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 74VHC138M?

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 74VHC138M we delivered, we will accept the replacement or return of the 74VHC138M 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 74VHC138M.

(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 74VHC138M pin diagram, 74VHC138M datasheet?

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

74VHC138M Produits Connexes

ABM8W-19.6800MHZ-7-B2U-T3	Abracon LLC, CRYSTAL 19.680MHZ 7PF SMT, 4-SMD, No Lead, 74VHC	Vue
NZX10A,133	Nexperia USA Inc., DIODE ZENER 10V 500MW ALF2, DO-204AH, DO-35, Axial, 74VHC	Vue
CHM-14-30-95-36-AA10-F3-3	Luminus Devices Inc., LED COB 3000K SQUARE, -, 74VHC	Vue
SMPC33A-M3/87A	Vishay Semiconductor Diodes Division, TVS DIODE 33VWM 53.3VC SMPC, TO-277, 3-PowerDFN, 74VHC	Vue
P51-200-A-L-D-5V-000-000	SSI Technologies Inc, SENSOR 200PSI M10-1.25 6H 1-5V, Cylinder, 74VHC	Vue
RT0402FRE0711K3L	Yageo, RES SMD 11.3K OHM 1% 1/16W 0402, 0402 (1005 Metric), 74VHC	Vue
T1008-R22G	Tamura, FIXED IND 220NH 500MA 360 MOHM, 1008 (2520 Metric), 74VHC	Vue
SBH11-PBPC-D07-RA-BK	Sullins Connector Solutions, CONN HEADR 2.54MM 14POS GOLD R/A, -, 74VHC	Vue
CA06COME16S-1PBF80	ITT Cannon, LLC, CONN PLUG 7POS INLINE W/PINS, -, 74VHC	Vue
AYM18DTAN-S189	Sullins Connector Solutions, CONN EDGE DUAL FMALE 36POS 0.156, -, 74VHC	Vue
MMD25-0141K1	Vishay Dale, CONN RACK/PANEL 14POS 5A, -, 74VHC	Vue
XC9142F32CMR-G	Torex Semiconductor Ltd, 0.8A SYNCHRONOUS STEP-UP DC/DC C, -, 74VHC	Vue

74VHC138M Des garanties

Garanties de service

Nous garantissons la satisfaction du client à 100%.

Notre équipe de vente expérimentée et notre équipe d'assistance technique recourent à nos services pour satisfaire tous nos clients.

Garantie de qualité

Nous fournissons une garantie de 90 jours.

Si les articles que vous avez reçus n'étaient pas de qualité parfaite, nous serions responsables de votre remboursement ou de votre remplacement, mais les articles doivent être retournés dans leur état d'origine.

Chaînes d'approvisionnement mondiales - Ressources de distributeurs fiables et agréées

Référence	Fabricant	Description	Stock
74VHC138M D# E02:0323_00847262	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin SOIC N Tube RoHS: Compliant	0
74VHC138MTC D# P40:2555_14469083	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin TSSOP Tube RoHS: Compliant	0
74VHC138MTCX D# V79:2366_19920723	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin TSSOP T/R RoHS: Compliant	0
74VHC138MX D# V72:2272_06297076	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin SOIC N T/R RoHS: Compliant	0

Référence	Fabricant	Description	Stock
MC74VHC138MEL D# MC74VHC138MEL	ON Semiconductor	- Bulk (Alt: MC74VHC138MEL)	0
74VHC138M D# 74VHC138M	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin SOIC N Rail - Rail/Tube (Alt: 74VHC138M)	0
MC74VHC138M D# MC74VHC138M	ON Semiconductor	- Bulk (Alt: MC74VHC138M)	0
74VHC138MTC D# 74VHC138MTC	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin TSSOP Rail - Rail/Tube (Alt: 74VHC138MTC)	0
74VHC138MTCX D# 74VHC138MTCX	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin TSSOP T/R - Bulk (Alt: 74VHC138MTCX)	0
74VHC138MX D# 74VHC138MX	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin SOIC N T/R - Bulk (Alt: 74VHC138MX)	0

Référence	Fabricant	Description	Stock
74VHC138MX D# 74VHC138MX	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin SOIC N T/R (Alt: 74VHC138MX)	0
74VHC138MTC D# 74VHC138MTC	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin TSSOP Rail (Alt: 74VHC138MTC)	0
74VHC138MTCX D# 74VHC138MTCX	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin TSSOP T/R (Alt: 74VHC138MTCX)	0

Référence	Fabricant	Description	Stock
74VHC138M D# 74VHC138M	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin SOIC N Rail (Alt: 74VHC138M)	0
74VHC138MTC D# 74VHC138MTC	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin TSSOP Rail (Alt: 74VHC138MTC)	0
74VHC138MX D# 74VHC138MX	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin SOIC N T/R (Alt: 74VHC138MX)	0
74VHC138MTCX D# 74VHC138MTCX	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin TSSOP T/R (Alt: 74VHC138MTCX)	0

Référence	Fabricant	Description	Stock
74VHC138MTCX	Fairchild Semiconductor Corporation		6178
74VHC138M	Fairchild Semiconductor Corporation		275
74VHC138MTR	STMicroelectronics		1198

Référence	Fabricant	Description	Stock
74VHC138M	Fairchild Semiconductor Corporation	DECODER/DEMUX 3-TO-8 16TSSOP	2500
74VHC138MTCX	Fairchild Semiconductor Corporation	DECODER/DEMUX 3-TO-8 16TSSOP	2500
74VHC138MX	Fairchild Semiconductor Corporation	DECODER/DEMUX 3-TO-8 16SOIC	0
74VHC138MTR	STMicroelectronics	IC DECODER 3 TO 8 LINE 16-SOIC	0
74VHC138MTC	Fairchild Semiconductor Corporation	DECODER/DEMUX 3-TO-8 16TSSOP	2500

Référence

Fabricant

Description

Stock

74VHC138MTC

D# C1S541901612579

ON Semiconductor

Signal switches, multiplexers, decoders

RoHS: Compliant

pbFree: Yes

Min Qty: 1

Container: Tube

Référence

Fabricant

Description

Stock

74VHC138MTCX

ON Semiconductor

Decoder/·ֽ TSSOP-16 74 Series RoHS

Référence

Fabricant

Description

Stock

74VHC138MTCX

Fairchild Semiconductor Corporation

Decoder/Driver, AHC/VHC Series, Inverted Output, CMOS, PDSO16

RoHS: Compliant

Référence	Fabricant	Description	Stock
74VHC138MX D# 74VHC138MXTR-ND	ON Semiconductor	IC DECODER/DEMUX 1X3:8 16SOIC	0
74VHC138MTC D# 74VHC138MTC-ND	ON Semiconductor	IC DECODER/DEMUX 1X3:8 16TSSOP	129
MC74VHC138MEL D# 2156-MC74VHC138MEL-ND	Rochester Electronics LLC	DECODER/DRIVER, AHC/VHC SERIES	10000
74VHC138MTCX D# 74VHC138MTCXCT-ND	ON Semiconductor	IC DECODER/DEMUX 1X3:8 16TSSOP	3311
74VHC138MTR D# 497-1103-2-ND	STMicroelectronics	IC DECODER/DEMUX 1 X 3:8 16SO	0
MC74VHC138M D# 2156-MC74VHC138M-ND	Rochester Electronics LLC	DECODER/DRIVER, AHC/VHC SERIES	4900
74VHC138M D# 74VHC138M-ND	ON Semiconductor	IC DECODER/DEMUX 1X3:8 16SOIC	761

Référence	Fabricant	Description	Stock
74VHC138MTC	Fairchild Semiconductor Corporation	In stock shipping within 2days	148
74VHC138MTCX	Fairchild Semiconductor Corporation	In stock shipping within 2days	20260
74VHC138M	Fairchild Semiconductor Corporation	In stock shipping within 2days	208

Référence	Fabricant	Description	Stock
74VHC138MTCX D# 1607676RL	ON Semiconductor	IC, SM, LOGIC, 74VHC, DECODER RoHS: Compliant Min Qty: 5 Container: Reel	0
74VHC138MX D# 3609321	ON Semiconductor	3-TO-8 DECODER/DEMULTIPLEXER RoHS: Compliant Min Qty: 2500 Container: Reel	0
74VHC138M D# 1014115	ON Semiconductor	74VHC CMOS, SMD, 74VHC138, SOIC16 RoHS: Compliant Min Qty: 1 Container: Each	447
74VHC138MTC D# 2453017	ON Semiconductor	DECODER/DEMULTIPLEXER, 3:8, TSSOP-16 RoHS: Compliant Min Qty: 5 Container: Each	9

Référence

Fabricant

Description

Stock

74VHC138MTCX

ON Semiconductor

74VHC Series High Speed CMOS 3-to-8 Decoder/Demultiplexer - TSSOP-16

RoHS: Compliant

pbFree: Yes

74VHC138MTC

ON Semiconductor

74VHC Series High Speed CMOS 3-to-8 Decoder/Demultiplexer - TSSOP-16

RoHS: Compliant

pbFree: Yes

Référence	Fabricant	Description	Stock
274VHC138M	ON Semiconductor	OEM/CM QUOTES ONLY \| NO BROKERS	9294
74VHC138MTCXNOPB	FAIR CHILD	OEM/CM QUOTES ONLY \| NO BROKERS	675625
74VHC138MTCX	Fairchild Semiconductor C	OEM/CM QUOTES ONLY \| NO BROKERS	82828
74VHC138MX	Fairchild Semiconductor Corporation	OEM/CM QUOTES ONLY \| NO BROKERS	11500
MC74VHC138MEL	Rochester Electronics LLC	OEM/CM QUOTES ONLY \| NO BROKERS	11600
74VHC138MXNL	Fairchild Semiconductor Corporation	OEM/CM QUOTES ONLY \| NO BROKERS	2875
74VHC138MTR	STMicroelectronics	OEM/CM QUOTES ONLY \| NO BROKERS	5065
74VHC138M	ON Semiconductor	OEM/CM QUOTES ONLY \| NO BROKERS	11282
MC74VHC138M	Rochester Electronics LLC	OEM/CM QUOTES ONLY \| NO BROKERS	5684
74VHC138MTC	ON Semiconductor	OEM/CM QUOTES ONLY \| NO BROKERS	10715
MM74VHC138MTC	FAIR	OEM/CM QUOTES ONLY \| NO BROKERS	3
DM74VHC138MTCX	Fairchild Semiconductor Corporation	OEM/CM QUOTES ONLY \| NO BROKERS	2644

Référence

Fabricant

Description

Stock

MM74VHC138MT

Texas Instruments

OEM/CM ONLY

708

Référence

Fabricant

Description

Stock

74VHC138M

Fairchild Semiconductor Corporation

In stock

275

Référence

Fabricant

Description

Stock

74VHC138MTCX

D# C6144

ON Semiconductor

Référence	Fabricant	Description	Stock
74VHC138MX	Fairchild Semiconductor Corporation	OEM/CM Immediate delivery	378
74VHC138M	Fairchild Semiconductor Corporation	OEM/CM Immediate delivery	108
74VHC138MTC	Fairchild Semiconductor Corporation	OEM/CM Immediate delivery	49
74VHC138MTCX	Fairchild Semiconductor Corporation	OEM/CM Immediate delivery	110250

Référence	Fabricant	Description	Stock
74VHC138MTC D# 512-74VHC138MTC	ON Semiconductor	Encoders, Decoders, Multiplexers & Demultiplexers 3to8 Decoder/Demult RoHS: Compliant	945
74VHC138MTCX D# 512-74VHC138MTCX	ON Semiconductor	Encoders, Decoders, Multiplexers & Demultiplexers 3to8 Decoder/Demult RoHS: Compliant	2628
74VHC138MX D# 512-74VHC138MX	ON Semiconductor	Encoders, Decoders, Multiplexers & Demultiplexers 3to8 Decoder/Demult RoHS: Compliant	3
74VHC138M D# 512-74VHC138M	ON Semiconductor	Encoders, Decoders, Multiplexers & Demultiplexers 3to8 Decoder/Demult RoHS: Compliant	2590

Référence	Fabricant	Description	Stock
74VHC138MTC D# XSKDRABV0016250	ON SEMICONDUCTOR	Bus Transceiver, LVT Series,1-Func,8-Bit,TrueOutput, BICMOS, PDSO20	4899
74VHC138MTCX D# XSKDRABS0047590	ON SEMICONDUCTOR		22500
74VHC138M D# XSKDRABS0047589	ON SEMICONDUCTOR	3-TO-8 LINE DECODER	5010

Référence	Fabricant	Description	Stock
74VHC138M D# 26AC8735	ON Semiconductor	1-OF-8 DECOD/DEMUX ROHS COMPLIANT: YES RoHS: Compliant Min Qty: 48 Container: Bulk	0
74VHC138MTC D# 29AC1250	ON Semiconductor	1-OF-8 DECOD/DEMUX ROHS COMPLIANT: YES RoHS: Compliant Min Qty: 94 Container: Bulk	2944
74VHC138MTCX D# 98AC5379	ON Semiconductor	1-OF-8 DECOD/DEMUX ROHS COMPLIANT: YES RoHS: Compliant Min Qty: 2500 Container: TAPE & REEL - FULL	0
74VHC138MX D# 19C0061	ON Semiconductor	IC,DECODER/DEMUX,3-TO-8-LINE,AHC/VHC-CMOS,SOP,16PIN,PLASTIC ROHS COMPLIANT: YES RoHS: Compliant Min Qty: 2500 Container: TAPE & REEL - FULL	0

Référence	Fabricant	Description	Stock
74VHC138M D# NS-74VHC138M	Fairchild Semiconductor Corporation	OEM/CM ONLY	2207
74VHC138MX D# NS-74VHC138MX	Fairchild Semiconductor Corporation	OEM/CM ONLY	2470
74VHC138MSCX D# NS-74VHC138MSCX	National Semiconductor Corporation	OEM/CM ONLY	8522
MC74VHC138M D# NS-MC74VHC138M	VARIOUS	OEM/CM ONLY	2329
74VHC138MTR D# NS-74VHC138MTR	STMicroelectronics	OEM/CM ONLY	8223
74VHC138MTCX D# NS-74VHC138MTCX	Fairchild Semiconductor Corporation	OEM/CM ONLY	4932

Référence	Fabricant	Description	Stock
74VHC138MTC	Fairchild Semiconductor Corporation	Demultiplexer/Decoder, 3 To 8 Line, 16 Pin, Plastic, TSSOP	47
74VHC138M	Fairchild Semiconductor Corporation	AHC/VHC SERIES, OTHER DECODER/DRIVER, INVERTED OUTPUT, 16 Pin Plastic SOP	44
74VHC138MTCX	Fairchild Semiconductor Corporation	Demultiplexer/Decoder, 3 To 8 Line, 16 Pin, Plastic, TSSOP	69324

Référence	Fabricant	Description	Stock
74VHC138MTCX D# 74VHC138MTCX	Texas Instruments	Semiconductor	11802
74VHC138MTR D# 74VHC138MTR	STMicroelectronics	Semiconductor	4404
74VHC138MTC D# 74VHC138MTC	Fairchild Semiconductor Corporation	Semiconductor	1195

Référence

Fabricant

Description

Stock

74VHC138M

D# 8021358

ON Semiconductor

ON Semiconductor 74VHC138M, Decoder, 16-Pin SOIC, TU

Min Qty: 48

Container: Tube

384

Référence	Fabricant	Description	Stock
74VHC138MTC	ON Semiconductor	Decoder/Driver, AHC/VHC Series, Inverted Output, CMOS, PDSO16 RoHS: Compliant	4418
MC74VHC138MEL	ON Semiconductor	Decoder/Driver, AHC/VHC Series, Inverted Output, CMOS, PDSO16 RoHS: Compliant	10000
74VHC138MTCX	Fairchild Semiconductor Corporation	Decoder/Driver, AHC/VHC Series, Inverted Output, CMOS, PDSO16 RoHS: Compliant	120361
MC74VHC138M	ON Semiconductor	Decoder/Driver, AHC/VHC Series, Inverted Output, CMOS, PDSO16 RoHS: Compliant	4900
74VHC138M	ON Semiconductor	Decoder/Driver, AHC/VHC Series, Inverted Output, CMOS, PDSO16 RoHS: Compliant	9600

Référence	Fabricant	Description	Stock
DM74VHC138MTCX	Fairchild Semiconductor Corporation	OEM/CM ONLY	2310
74VHC138MTR	STMicroelectronics	OEM/CM ONLY	8099
74VHC138MTCX.	Fairchild Semiconductor Corporation	OEM/CM ONLY	117168
274VHC138M	ON Semiconductor	OEM/CM ONLY	8320
74VHC138MTC	Fairchild Semiconductor Corporation	OEM/CM ONLY	9957
74VHC138MXNL	Fairchild Semiconductor Corporation	OEM/CM ONLY	2516
74VHC138MTCX/NOPB	FAIR CHILD	OEM/CM ONLY	587516
MC74VHC138M	ON Semiconductor	OEM/CM ONLY	58
74VHC138MX	Fairchild Semiconductor Corporation	OEM/CM ONLY	10016
74VHC138M	Fairchild Semiconductor Corporation	OEM/CM ONLY	9982

Référence	Fabricant	Description	Stock
74VHC138MTCX	Fairchild Semiconductor Corporation	IN stock Immediate delivery	110235
74VHC138M	Fairchild Semiconductor Corporation	IN stock Immediate delivery	103
74VHC138MTC	Fairchild Semiconductor Corporation	IN stock Immediate delivery	44
74VHC138MX	Fairchild Semiconductor Corporation	IN stock Immediate delivery	373

Référence	Fabricant	Description	Stock
74VHC138MTCX-F4	Fairchild Semiconductor Corporation	shipping today	1377
74VHC138M	Fairchild Semiconductor Corporation	shipping today	131
74VHC138MTCX	Fairchild Semiconductor Corporation	shipping today	1391
74VHC138MX	Fairchild Semiconductor Corporation	shipping today	93

Référence	Fabricant	Description	Stock
74VHC138M D# 40959442	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin SOIC N Tube RoHS: Compliant	0
74VHC138MTC D# 26636265	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin TSSOP Tube RoHS: Compliant	0
74VHC138MTCX D# 26899989	ON Semiconductor	Decoder/Demultiplexer Single 3-to-8 16-Pin TSSOP T/R RoHS: Compliant	0

Référence

Fabricant

Description

Stock

74VHC138M

Fairchild Semiconductor Corporation

RFQ

1229

Référence

Fabricant

Description

Stock

74VHC138MX

Fairchild Semiconductor Corporation

DECODER/DEMUX 3-TO-8 16SOIC

1531

Référence	Fabricant	Description	Stock
74VHC138MTC D# 2453017	ON Semiconductor	DECODER/DEMULTIPLEXER, 3:8, TSSOP-16 RoHS: Compliant Min Qty: 1 Container: Each	0
74VHC138MTCX D# 1607676RL	ON Semiconductor	IC, SM, LOGIC, 74VHC, DECODER RoHS: Compliant Min Qty: 1 Container: Reel	0
74VHC138M D# 1014115	ON Semiconductor	74VHC CMOS, SMD, 74VHC138, SOIC16 RoHS: Compliant Min Qty: 1 Container: Each	290

Quick Inquiry

74VHC138M

Qualité certifiée

L'engagement de Heisener en matière de qualité a façonné nos processus d'approvisionnement, de test, d'expédition et à chaque étape intermédiaire. Cette fondation est à la base de chaque composant que nous vendons.

ISO9001:2015, ICAS, IAF, UKAS