부품 번호 | 913DS |
---|---|
제조업체 | Switchcraft Inc. |
설명 | SWITCH PUSH SPDT-MBB 0.25A 125V |
데이터시트 | |
패키지 | - |
ECAD | |
재고 | 5,562 piece(s) |
단가 | Request a Quote |
리드 타임 | 확인하려면 |
예상 배달 시간 | 11월 11 - 11월 16 (신속 배송 선택) |
견적 요청 |
|
지불 방법 | |
배달 서비스 |
우리는 100 % 고객 만족을 보장합니다.
경험 많은 영업 팀과 기술 지원 팀이 모든 고객을 만족시키기 위해 서비스를 지원합니다.
우리는 90 일 보증을 제공합니다.
수령 한 품목의 품질이 완벽하지 않은 경우 당사는 환불 또는 교체에 대한 책임을지며 품목은 원래 상태로 반환해야합니다.
부품 번호 | 제조업체 | 설명 | 재고 |
EP913DS23 D# 70812920 |
Switchcraft Conxall |
Sealed Momentary Cable Switch "D" Circuit 0.230 - 0.255 Cable OD RoHS: Not Compliant
|
93 |
EP913DS14 D# 70812807 |
Switchcraft Conxall |
Sealed Momentary Cable Switch "D" Circuit 0.140 - 0.170 Cable OD RoHS: Not Compliant
|
40 |
EP913DS20 D# 70812809 |
Switchcraft Conxall |
Sealed Momentary Cable Switch "D" Circuit 0.200 - 0.230 Cable OD RoHS: Not Compliant
|
15 |
EP913DS17 D# 70812808 |
Switchcraft Conxall |
Sealed Momentary Cable Switch "D" Circuit 0.170 - 0.200 Cable OD RoHS: Not Compliant
|
14 |
913DS D# 70363360 |
Switchcraft Conxall |
Switch, Pushbutton, SPDT, 250mA 125VAC, Capable of Contact Form A, B, C and D RoHS: Not Compliant
|
0 |
부품 번호 | 제조업체 | 설명 | 재고 |
EP913DS20 D# V99:2348_14655088 |
Switchcraft Conxall |
Switch Push Button N.O./N.C. DPDT Round Button Momentary Contact Connector RoHS: Compliant
|
0 |
RNC55H2913DSB14 D# V90:2381_09869151 |
Vishay Intertechnologies |
Res Metal Film 291K Ohm 0.5% 0.125W(1/8W) ±50ppm/°C 0.001% Epoxy AXL Bulk RoHS: Not Compliant
|
0 |
부품 번호 | 제조업체 | 설명 | 재고 |
RNC60H1913DSRE5 D# RNC60H1913DSRE5 |
Vishay Intertechnologies |
Res Metal Film 191K Ohm 0.5% 1/4W ±50ppm/°C 0.001% Conformal AXL Thru-Hole T/R - Tape and Reel (Alt: RNC60H1913DSRE5) RoHS: Not Compliant
|
0 |
RNC60H1913DSRSL D# RNC60H1913DSRSL |
Vishay Intertechnologies |
RES MTLFLM ERC-55-200 191K .5% T-2 - Tape and Reel (Alt: RNC60H1913DSRSL) RoHS: Not Compliant
|
0 |
RNR60E1913DSBSL1 D# RNR60E1913DSBSL1 |
Vishay Intertechnologies |
RES MTLFLM HDN-60-1 191K .5% T-9 - Bulk (Alt: RNR60E1913DSBSL1) RoHS: Not Compliant
|
0 |
RNR55C2913DSRSL65 D# RNR55C2913DSRSL65 |
Vishay Intertechnologies |
RES MTLFLM HDN-55-65 291K .5% T-2 - Tape and Reel (Alt: RNR55C2913DSRSL65) RoHS: Not Compliant
|
0 |
440HT143XM1913DS D# 440HT143XM1913DS |
Glenair Inc |
MILITARY ACCESSORY - Bulk (Alt: 440HT143XM1913DS) RoHS: Not Compliant
|
0 |
RNR55E1913DSM7665 D# RNR55E1913DSM7665 |
Vishay Intertechnologies |
Res Metal Film 191K Ohm 0.5% 1/8W ±25ppm/°C 0.001% Conformal AXL Thru-Hole Foil Bag - Bulk (Alt: RNR55E1913DSM7665) RoHS: Not Compliant
|
0 |
440HS143XM1913DS D# 440HS143XM1913DS |
Glenair Inc |
MILITARY ACCESSORY - Bulk (Alt: 440HS143XM1913DS) RoHS: Not Compliant
|
0 |
RNC60H2913DSB14 D# RNC60H2913DSB14 |
Vishay Intertechnologies |
Res Metal Film 291K Ohm 0.5% 1/4W ±50ppm/°C 0.001% Conformal AXL Thru-Hole Bulk - Bulk (Alt: RNC60H2913DSB14) RoHS: Not Compliant
|
0 |
RNC55H2913DSB14 D# RNC55H2913DSB14 |
Vishay Intertechnologies |
Res Metal Film 291K Ohm 0.5% 1/8W ±50ppm/°C 0.001% Conformal AXL Thru-Hole Bulk - Bulk (Alt: RNC55H2913DSB14) RoHS: Not Compliant
|
0 |
RNC60H1913DSBSL D# RNC60H1913DSBSL |
Vishay Intertechnologies |
RES MTLFLM ERC-55-200 191K .5% T-2 - Bulk (Alt: RNC60H1913DSBSL) RoHS: Not Compliant
|
0 |
RNR60E2913DSRSL1 D# RNR60E2913DSRSL1 |
Vishay Intertechnologies |
RES MTLFLM HDN-60-1 291K .5% T-9 - Tape and Reel (Alt: RNR60E2913DSRSL1) RoHS: Not Compliant
|
0 |
RNC55H2913DSRSL D# RNC55H2913DSRSL |
Vishay Intertechnologies |
RES MTLFLM ERC-55 291K .5% T-2 - Tape and Reel (Alt: RNC55H2913DSRSL) RoHS: Not Compliant
|
0 |
RNC60H1913DSB14 D# RNC60H1913DSB14 |
Vishay Intertechnologies |
Res Metal Film 191K Ohm 0.5% 1/4W ±50ppm/°C 0.001% Conformal AXL Thru-Hole Bulk - Bulk (Alt: RNC60H1913DSB14) RoHS: Not Compliant
|
0 |
RNC55H2913DSBSL D# RNC55H2913DSBSL |
Vishay Intertechnologies |
RES MTLFLM ERC-55 291K .5% T-2 - Bulk (Alt: RNC55H2913DSBSL) RoHS: Not Compliant
|
0 |
RNR60E2913DSBSL1 D# RNR60E2913DSBSL1 |
Vishay Intertechnologies |
RES MTLFLM HDN-60-1 291K .5% T-9 - Bulk (Alt: RNR60E2913DSBSL1) RoHS: Not Compliant
|
0 |
RNR55C2913DSBSL D# RNR55C2913DSBSL |
Vishay Intertechnologies |
RES MTLFLM HDN-55 291K .5% T-2 - Bulk (Alt: RNR55C2913DSBSL) RoHS: Not Compliant
|
0 |
RNR55C2913DSM7665 D# RNR55C2913DSM7665 |
Vishay Intertechnologies |
Res Metal Film 291K Ohm 0.5% 1/8W ±50ppm/°C 0.001% Conformal AXL Thru-Hole Foil Bag - Bulk (Alt: RNR55C2913DSM7665) RoHS: Not Compliant
|
0 |
RNR55E1913DSBSL D# RNR55E1913DSBSL |
Vishay Intertechnologies |
RES MTLFLM HDN-55 191K .5% T-9 - Bulk (Alt: RNR55E1913DSBSL) RoHS: Not Compliant
|
0 |
RNC60H1913DSRE6 D# RNC60H1913DSRE6 |
Vishay Intertechnologies |
Res Metal Film 191K Ohm 0.5% 1/4W ±50ppm/°C 0.001% Conformal AXL Thru-Hole T/R - Tape and Reel (Alt: RNC60H1913DSRE6) RoHS: Not Compliant
|
0 |
440HA143XM1913DS D# 440HA143XM1913DS |
Glenair Inc |
MILITARY ACCESSORY - Bulk (Alt: 440HA143XM1913DS) RoHS: Not Compliant
|
0 |
RNR55E2913DSBSL D# RNR55E2913DSBSL |
Vishay Intertechnologies |
RES MTLFLM HDN-55 291K .5% T-9 - Bulk (Alt: RNR55E2913DSBSL) RoHS: Not Compliant
|
0 |
RNR60C1913DSBSL D# RNR60C1913DSBSL |
Vishay Intertechnologies |
RES MTLFLM HDN-60 191K .5% T-2 - Bulk (Alt: RNR60C1913DSBSL) RoHS: Not Compliant
|
0 |
RNR60C2913DSRSL1 D# RNR60C2913DSRSL1 |
Vishay Intertechnologies |
RES MTLFLM HDN-60-1 291K .5% T-2 - Tape and Reel (Alt: RNR60C2913DSRSL1) RoHS: Not Compliant
|
0 |
부품 번호 | 제조업체 | 설명 | 재고 |
EP913DS17 D# EP913DS17 |
Switchcraft Conxall |
Switch Push Button OFF-MOM/ON-MOM SPDT Round 125VAC 48VDC Solder Lug Cable Mount (Alt: EP913DS17) |
0 |
부품 번호 | 제조업체 | 설명 | 재고 |
RNC60H1913DSRE6 |
Vishay Dale |
RES MTLFLM 191K OHM 0.5% 1/4W 50PPM/ C 0.001% AXL TH - Tape and Reel |
0 |
RNC60H1913DSRSL |
Vishay Dale |
RES MTLFLM ERC-55-200 191K .5% T-2 - Tape and Reel |
0 |
RNC60H2913DSB14 |
Vishay Dale |
RES MTLFLM 291K OHM 0.5% 1/4W 50PPM/ C 0.001% AXL TH - Bulk |
0 |
RNC55H2913DSB14 |
Vishay Dale |
RES MTLFLM 291K OHM 0.5% 1/8W 50PPM/ C 0.001% AXL TH - Bulk |
0 |
RNC55H2913DSRSL |
Vishay Dale |
RES MTLFLM ERC-55 291K .5% T-2 - Tape and Reel |
0 |
RNC60H1913DSBSL |
Vishay Dale |
RES MTLFLM ERC-55-200 191K .5% T-2 - Bulk |
0 |
RNC60H1913DSB14 |
Vishay Dale |
RES MTLFLM 191K OHM 0.5% 1/4W 50PPM/ C 0.001% AXL TH - Bulk |
0 |
RNC55H2913DSBSL |
Vishay Dale |
RES MTLFLM ERC-55 291K .5% T-2 - Bulk |
0 |
부품 번호 | 제조업체 | 설명 | 재고 |
EP913DS17 D# SC2141-ND |
Switchcraft Conxall |
SWITCH PUSH SPDT-MBB 0.25A 125V |
0 |
RNC60H1913DSRE5 D# 541-RNC60H1913DSRE5TR-ND |
Vishay Dale |
ERC-55-200 191K .5% T-2 RNC60H19 |
0 |
RNC60H1913DSRSL D# RNC60H1913DSRSL-ND |
Vishay Dale |
RES 191K OHM 1/4W .5% AXIAL |
0 |
EP913DS23 D# SC2143-ND |
Switchcraft Conxall |
SWITCH PUSH SPDT-MBB 0.25A 125V |
0 |
RNC60H1913DSRE7 D# 541-RNC60H1913DSRE7TR-ND |
Vishay Dale |
ERC-55-200 191K .5% T-2 RNC60H19 |
0 |
RNC60H1913DSRE8 D# 541-RNC60H1913DSRE8TR-ND |
Vishay Dale |
ERC-55-200 191K .5% T-2 RNC60H19 |
0 |
RNC60H2913DSB14 D# RNC60H2913DSB14-ND |
Vishay Dale |
RES 291K OHM 1/4W .5% AXIAL |
0 |
RNC55H2913DSB14 D# RNC55H2913DSB14-ND |
Vishay Dale |
RES 291K OHM 1/8W .5% AXIAL |
0 |
EP913DS14 D# SC2140-ND |
Switchcraft Conxall |
SWITCH PUSH SPDT-MBB 0.25A 125V |
0 |
RNC60H1913DSBSL D# RNC60H1913DSBSL-ND |
Vishay Dale |
RES 191K OHM 1/4W .5% AXIAL |
0 |
RNC55H2913DSRSL D# RNC55H2913DSRSL-ND |
Vishay Dale |
RES 291K OHM 1/8W .5% AXIAL |
0 |
RNC60H1913DSB14 D# RNC60H1913DSB14-ND |
Vishay Dale |
RES 191K OHM 1/4W .5% AXIAL |
0 |
RNC55H2913DSBSL D# RNC55H2913DSBSL-ND |
Vishay Dale |
RES 291K OHM 1/8W .5% AXIAL |
0 |
SJ2-25913D-SMT-TR D# CP-SJ2-25913D-SMT-CT-ND |
CUI Devices |
AUDIO JACK, 2.5 MM, RT, 3 CONDUC |
912 |
EP913DS20 D# SC2142-ND |
Switchcraft Conxall |
SWITCH PUSH SPDT-MBB 0.25A 125V |
0 |
913DS D# SC2099-ND |
Switchcraft Conxall |
SWITCH PUSH SPDT-MBB 0.25A 125V |
26 |
RNC60H1913DSRE6 D# RNC60H1913DSRE6-ND |
Vishay Dale |
RES 191K OHM 1/4W .5% AXIAL |
0 |
부품 번호 | 제조업체 | 설명 | 재고 |
EP913DS14 D# 2517669 |
Switchcraft Conxall |
SWITCH, PUSHBUTTON, SPDT, SOLDER RoHS: Compliant
Min Qty: 100
Container: Each
|
0 |
EP913DS20 D# 2517671 |
Switchcraft Conxall |
SWITCH, PUSHBUTTON, SPDT, SOLDER RoHS: Compliant
Min Qty: 100
Container: Each
|
0 |
EP913DS17 D# 2517670 |
Switchcraft Conxall |
SWITCH, PUSHBUTTON, SPDT, SOLDER RoHS: Compliant
Min Qty: 100
Container: Each
|
0 |
부품 번호 | 제조업체 | 설명 | 재고 |
RNC50J2913DS |
"" |
OEM/CM QUOTES ONLY | NO BROKERS |
178 |
913DS |
Switchcraft Conxall |
OEM/CM QUOTES ONLY | NO BROKERS |
101 |
RNR60C2913DS |
"" |
OEM/CM QUOTES ONLY | NO BROKERS |
8 |
MS21913DS |
B&E |
OEM/CM QUOTES ONLY | NO BROKERS |
9 |
RNR55E2913DS |
"" |
OEM/CM QUOTES ONLY | NO BROKERS |
102 |
RNR60C1913DS |
"MEPCO" |
OEM/CM QUOTES ONLY | NO BROKERS |
151 |
RNC55J2913DS |
"CGW" |
OEM/CM QUOTES ONLY | NO BROKERS |
1171 |
EP913DS14 |
SWITCHCRAFT/CONXALL |
OEM/CM QUOTES ONLY | NO BROKERS |
3 |
RNC55H2913DSB14 |
"DALE RESISTOR" |
OEM/CM QUOTES ONLY | NO BROKERS |
325 |
RNC55H2913DS |
"Vishay" |
OEM/CM QUOTES ONLY | NO BROKERS |
6 |
부품 번호 | 제조업체 | 설명 | 재고 |
EP913DS17 |
Switchcraft Conxall |
RoHS: Compliant
|
0 |
EP913DS23 |
Switchcraft Conxall |
RoHS: Compliant
|
100 |
EP913DS14 |
Switchcraft Conxall |
RoHS: Compliant
|
0 |
EP913DS20 |
Switchcraft Conxall |
RoHS: Compliant
|
0 |
부품 번호 | 제조업체 | 설명 | 재고 |
SJ2-25913D-SMT-TR D# 490-SJ2-25913DSMT-TR |
CUI Devices |
Phone Connectors 2.5mm SMT low profle 3cond Tip/Ring swtch RoHS: Compliant
|
849 |
EP913DS23 D# 502-EP913DS23 |
Switchcraft Conxall |
Pushbutton Switches Sealed Momntary Cble Switch, Standard Cir RoHS: Compliant
|
29 |
부품 번호 | 제조업체 | 설명 | 재고 |
EP913DS23 D# 53Y2136 |
Switchcraft Conxall |
SWITCH, PUSHBUTTON, SPDT, SOLDER, Product Range:EP913DS Series, Contact Configuration:SPDT, Switch Operation:Momentary, Pushbutton Actuator Style:Round, Actuator / Cap Colour:Black, Contact Current AC Max:250mA, IP Rating:IP67 RoHS Compliant: Yes RoHS: Compliant
Min Qty: 100
Container: Bulk
|
0 |
440HT143XM1913DS D# 06AJ6909 |
Glenair Inc |
Banding, crimping, and Tinel-Lock EMI/RFI Shield Termination Backshells RoHS: Not Compliant
Min Qty: 1
Container: Bulk
|
0 |
440HS143XM1913DS D# 06AJ6861 |
Glenair Inc |
Banding, crimping, and Tinel-Lock EMI/RFI Shield Termination Backshells RoHS: Not Compliant
Min Qty: 1
Container: Bulk
|
0 |
EP913DS20 D# 53Y2135 |
Switchcraft Conxall |
SWITCH, PUSHBUTTON, SPDT, SOLDER, Product Range:EP913DS Series, Contact Configuration:SPDT, Switch Operation:Momentary, Pushbutton Actuator Style:Round, Actuator / Cap Colour:Black, Contact Current AC Max:250mA, IP Rating:IP67 RoHS Compliant: Yes RoHS: Compliant
Min Qty: 100
Container: Bulk
|
0 |
EP913DS17 D# 53Y2134 |
Switchcraft Conxall |
SWITCH, PUSHBUTTON, SPDT, SOLDER, Product Range:EP913DS Series, Contact Configuration:SPDT, Switch Operation:Momentary, Pushbutton Actuator Style:Round, Actuator / Cap Colour:Black, Contact Current AC Max:250mA, IP Rating:IP67 RoHS Compliant: Yes RoHS: Compliant
Min Qty: 100
Container: Bulk
|
0 |
EP913DS14 D# 53Y2133 |
Switchcraft Conxall |
SWITCH, PUSHBUTTON, SPDT, SOLDER, Product Range:EP913DS Series, Contact Configuration:SPDT, Switch Operation:Momentary, Pushbutton Actuator Style:Round, Actuator / Cap Colour:Black, Contact Current AC Max:250mA, IP Rating:IP67 RoHS Compliant: Yes RoHS: Compliant
Min Qty: 100
Container: Bulk
|
0 |
440HA143XM1913DS D# 06AJ4479 |
Glenair Inc |
Connector RoHS: Not Compliant
Min Qty: 1
Container: Bulk
|
0 |
부품 번호 | 제조업체 | 설명 | 재고 |
RNC60H1913DSRSL D# NS-RNC60H1913DSRSL |
Vishay Dale |
OEM/CM ONLY |
7437 |
RNC60H2913DSB14 D# NS-RNC60H2913DSB14 |
Vishay Dale |
OEM/CM ONLY |
2119 |
RNC60H1913DSBSL D# NS-RNC60H1913DSBSL |
Vishay Dale |
OEM/CM ONLY |
4655 |
RNC55H2913DSB14 D# NS-RNC55H2913DSB14 |
Vishay Dale |
OEM/CM ONLY |
5116 |
RNC60H1913DSB14 D# NS-RNC60H1913DSB14 |
Vishay Dale |
OEM/CM ONLY |
7473 |
RNC55H2913DSBSL D# NS-RNC55H2913DSBSL |
Vishay Dale |
OEM/CM ONLY |
1441 |
RNC55H2913DSRSL D# NS-RNC55H2913DSRSL |
Vishay Dale |
OEM/CM ONLY |
1391 |
RNC60H1913DSRE6 D# NS-RNC60H1913DSRE6 |
Vishay Dale |
OEM/CM ONLY |
4752 |
부품 번호 | 제조업체 | 설명 | 재고 |
EP913DS17 |
Switchcraft Conxall |
RoHS: Compliant
|
0 |
EP913DS23 |
Switchcraft Conxall |
RoHS: Compliant
|
100 |
EP913DS14 |
Switchcraft Conxall |
RoHS: Compliant
|
0 |
EP913DS20 |
Switchcraft Conxall |
RoHS: Compliant
|
0 |
부품 번호 | 제조업체 | 설명 | 재고 |
RNC55H2913DS D# RNC55H2913DS |
Vishay Intertechnologies |
Call 6312343553 |
5 |
부품 번호 | 제조업체 | 설명 | 재고 |
EP913DS20 D# 000000000005385282 |
Switchcraft Conxall |
Pushbutton Switches Sealed Momntary Cble Switch, Standard Cir |
0 |
EP913DS17 D# 000000000005385280 |
Switchcraft Conxall |
Pushbutton Switches Sealed Momntary Cble Switch, Standard Cir |
0 |
EP913DS23 D# 000000000005385283 |
Switchcraft Conxall |
Pushbutton Switches Sealed Momntary Cble Switch, Standard Cir |
0 |
EP913DS14 D# 000000000005385278 |
Switchcraft Conxall |
Pushbutton Switches Sealed Momntary Cble Switch, Standard Cir |
0 |
913DS D# 000000000005175438 |
Switchcraft Conxall |
Pushbutton Switches SEALED BUTTON SWITCH MAKE BEFORE BREAK |
0 |
부품 번호 | 제조업체 | 설명 | 재고 |
RNC50J2913DS |
OEM/CM ONLY |
164 | |
913DS |
Switchcraft Conxall |
OEM/CM ONLY |
152 |
RNR55E2913DS |
OEM/CM ONLY |
101 | |
RNR60C1913DS |
Vishay BCcomponents |
OEM/CM ONLY |
142 |
440HT143XM1913DS |
GLENAIR INC |
OEM/CM ONLY |
105 |
440HS143XM1913DS |
GLENAIR INC |
OEM/CM ONLY |
105 |
EP913DS17 |
SWITCHCRAFT CONXALL |
OEM/CM ONLY |
195 |
RNC55J2913DS |
CGW |
OEM/CM ONLY |
992 |
RNC55H2913DSB14 |
Vishay Dale |
OEM/CM ONLY |
366 |
EP913DS14 |
SWITCHCRAFT CONXALL |
OEM/CM ONLY |
97 |
440HA143XM1913DS |
GLENAIR INC |
OEM/CM ONLY |
120 |
부품 번호 | 제조업체 | 설명 | 재고 |
EP913DS23 |
Switchcraft Conxall |
Pushbutton Switches Sealed Momntary Cble Switch, Standard Cir pbFree: Pb-Free
|
0 |
부품 번호 | 제조업체 | 설명 | 재고 |
EP913DS20 D# 25891016 |
Switchcraft Conxall |
Switch Push Button N.O./N.C. DPDT Round Button Momentary Contact Connector RoHS: Compliant
|
0 |
EP913DS23 D# 53412256 |
Switchcraft Conxall |
Switch Push Button N.O./N.C. DPDT Round Button Momentary Contact Connector RoHS: Compliant
|
0 |
부품 번호 | 제조업체 | 설명 | 재고 |
EP913DS14 D# 2517669 |
Switchcraft Conxall |
SWITCH, PUSHBUTTON, SPDT, SOLDER RoHS: Compliant
Min Qty: 1
Container: Each
|
0 |
EP913DS20 D# 2517671 |
Switchcraft Conxall |
SWITCH, PUSHBUTTON, SPDT, SOLDER RoHS: Compliant
Min Qty: 1
Container: Each
|
0 |
EP913DS17 D# 2517670 |
Switchcraft Conxall |
SWITCH, PUSHBUTTON, SPDT, SOLDER RoHS: Compliant
Min Qty: 1
Container: Each
|
0 |
Heisener의 품질에 대한 약속은 소싱, 테스트, 선적 및 그 사이의 모든 단계에 대한 프로세스를 형성했습니다. 이 기초는 우리가 판매하는 각 구성 요소의 근간을 이루고 있습니다.
당신은 913DS 에 대한 질문이 있습니까?
+86-755-83210559 ext. 803
이 페이지를 보려면 스캔
IC MCU 8BIT 16KB FLASH 32LQFP
CAP CER 680PF 6.3KV RADIAL
IC MOTOR DRIVER PAR 25HZIP
IC OPAMP INSTR 10MHZ 8MSOP
IC REG CTRLR BUCK 10UMAX
TVS DIODE 5VWM 9.8VC SOD923
IC MCU 8BIT 32KB FLASH 44TQFP
IC RCVR QUAD RS422/485 16-SOIC
OPTOISOLATOR 3.75KV TRANS 4-SOP
IC OPAMP GP 65MHZ RRO 8SO