|
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
- ERZ-VA9V560
- Panasonic
-
1:
HK$7.89
-
990庫存量
|
Mouser 元件編號
667-ERZ-VA9V560
|
Panasonic
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
|
|
990庫存量
|
|
|
HK$7.89
|
|
|
HK$4.74
|
|
|
HK$2.98
|
|
|
HK$2.62
|
|
|
檢視
|
|
|
HK$2.24
|
|
|
HK$1.74
|
|
|
HK$1.65
|
|
|
HK$1.58
|
|
|
HK$1.49
|
|
最少： 1
倍數： 1
|
|
|
V
|
MOVs
|
PCB Mount
|
Radial
|
|
35 VAC
|
45 VDC
|
56 V
|
110 V
|
9 mm
|
1 kA
|
8.1 J
|
3750 pF
|
- 40 C
|
+ 85 C
|
|
|
|
|
壓敏電阻 ERZ-E 7mm 620V T&R ZNR Surge Absorber
- ERZ-E07E621
- Panasonic
-
1:
HK$4.77
-
3,089庫存量
|
Mouser 元件編號
667-ERZ-E07E621
|
Panasonic
|
壓敏電阻 ERZ-E 7mm 620V T&R ZNR Surge Absorber
|
|
3,089庫存量
|
|
|
HK$4.77
|
|
|
HK$2.92
|
|
|
HK$1.86
|
|
|
HK$1.69
|
|
|
HK$1.09
|
|
|
檢視
|
|
|
HK$0.896
|
|
|
HK$0.88
|
|
最少： 1
倍數： 1
:
500
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
385 VAC
|
505 VDC
|
620 V
|
1.025 kV
|
10 mm
|
2.5 kA
|
80 J
|
190 pF
|
- 40 C
|
+ 85 C
|
Reel, Cut Tape
|
|
|
|
壓敏電阻 ERZ-E 11mm 1000V T&R ZNR Surge Absorber
- ERZ-E11E102
- Panasonic
-
1:
HK$7.64
-
2,348庫存量
|
Mouser 元件編號
667-ERZ-E11E102
|
Panasonic
|
壓敏電阻 ERZ-E 11mm 1000V T&R ZNR Surge Absorber
|
|
2,348庫存量
|
|
|
HK$7.64
|
|
|
HK$4.60
|
|
|
HK$2.95
|
|
|
HK$2.74
|
|
|
HK$2.00
|
|
|
檢視
|
|
|
HK$1.97
|
|
|
HK$1.66
|
|
|
HK$1.64
|
|
|
HK$1.59
|
|
最少： 1
倍數： 1
:
500
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
625 VAC
|
825 VDC
|
1 kV
|
1.65 kV
|
14 mm
|
5 kA
|
280 J
|
220 pF
|
- 40 C
|
+ 85 C
|
Reel, Cut Tape
|
|
|
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
- ERZ-V07D271CS
- Panasonic
-
1:
HK$4.77
-
523庫存量
|
Mouser 元件編號
667-ERZ-V07D271CS
|
Panasonic
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
|
|
523庫存量
|
|
|
HK$4.77
|
|
|
HK$2.85
|
|
|
HK$1.76
|
|
|
HK$1.54
|
|
|
檢視
|
|
|
HK$1.30
|
|
|
HK$0.978
|
|
|
HK$0.871
|
|
|
HK$0.863
|
|
|
HK$0.814
|
|
最少： 1
倍數： 1
|
|
|
V
|
MOVs
|
PCB Mount
|
Radial
|
|
175 VAC
|
225 VDC
|
270 V
|
455 V
|
7 mm
|
1.75 kA
|
24 J
|
150 pF
|
- 40 C
|
+ 85 C
|
|
|
|
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
- ERZ-V07V470CS
- Panasonic
-
1:
HK$4.77
-
771庫存量
|
Mouser 元件編號
667-ERZ-V07V470CS
|
Panasonic
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
|
|
771庫存量
|
|
|
HK$4.77
|
|
|
HK$2.85
|
|
|
HK$1.76
|
|
|
HK$1.54
|
|
|
檢視
|
|
|
HK$1.30
|
|
|
HK$0.995
|
|
|
HK$0.888
|
|
|
HK$0.838
|
|
|
HK$0.814
|
|
最少： 1
倍數： 1
|
|
|
V
|
MOVs
|
PCB Mount
|
Radial
|
|
30 VAC
|
38 VDC
|
47 V
|
93 V
|
7 mm
|
500 A
|
2.3 J
|
1550 pF
|
- 40 C
|
+ 85 C
|
|
|
|
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
- ERZ-V09D221
- Panasonic
-
1:
HK$7.23
-
242庫存量
|
Mouser 元件編號
667-ERZ-V09D221
|
Panasonic
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
|
|
242庫存量
|
|
|
HK$7.23
|
|
|
HK$4.32
|
|
|
HK$2.72
|
|
|
HK$2.38
|
|
|
檢視
|
|
|
HK$2.04
|
|
|
HK$1.42
|
|
|
HK$1.36
|
|
|
HK$1.30
|
|
最少： 1
倍數： 1
|
|
|
V
|
MOVs
|
PCB Mount
|
Radial
|
|
140 VAC
|
180 VDC
|
220 V
|
360 V
|
9 mm
|
3.5 kA
|
39 J
|
410 pF
|
- 40 C
|
+ 85 C
|
|
|
|
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
- ERZ-V09V431CS
- Panasonic
-
1:
HK$7.23
-
403庫存量
|
Mouser 元件編號
667-ERZ-V09V431CS
|
Panasonic
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
|
|
403庫存量
|
|
|
HK$7.23
|
|
|
HK$4.32
|
|
|
HK$2.72
|
|
|
HK$2.38
|
|
|
檢視
|
|
|
HK$2.04
|
|
|
HK$1.59
|
|
|
HK$1.50
|
|
|
HK$1.42
|
|
|
HK$1.36
|
|
最少： 1
倍數： 1
|
|
|
V
|
MOVs
|
PCB Mount
|
Radial
|
|
275 VAC
|
350 VDC
|
430 V
|
710 V
|
9 mm
|
3.5 kA
|
80 J
|
270 pF
|
- 40 C
|
+ 85 C
|
|
|
|
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
- ERZ-V10D241CS
- Panasonic
-
1:
HK$6.41
-
1,744庫存量
|
Mouser 元件編號
667-ERZ-V10D241CS
|
Panasonic
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
|
|
1,744庫存量
|
|
|
HK$6.41
|
|
|
HK$3.80
|
|
|
HK$2.38
|
|
|
HK$2.07
|
|
|
檢視
|
|
|
HK$1.82
|
|
|
HK$1.55
|
|
|
HK$1.24
|
|
|
HK$1.16
|
|
|
HK$1.15
|
|
最少： 1
倍數： 1
|
|
|
V
|
MOVs
|
PCB Mount
|
Radial
|
|
150 VAC
|
200 VDC
|
240 V
|
395 V
|
10 mm
|
3.5 kA
|
42 J
|
380 pF
|
- 40 C
|
+ 85 C
|
|
|
|
|
壓敏電阻 ERZ-E 7mm 510V Bulk ZNR Surge Absorber
- ERZ-E07B511CS
- Panasonic
-
1:
HK$4.77
-
229庫存量
|
Mouser 元件編號
667-ERZ-E07B511CS
|
Panasonic
|
壓敏電阻 ERZ-E 7mm 510V Bulk ZNR Surge Absorber
|
|
229庫存量
|
|
|
HK$4.77
|
|
|
HK$2.83
|
|
|
HK$1.74
|
|
|
HK$1.53
|
|
|
檢視
|
|
|
HK$1.09
|
|
|
HK$1.08
|
|
|
HK$1.02
|
|
|
HK$0.732
|
|
最少： 1
倍數： 1
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
320 VAC
|
410 VDC
|
510 V
|
845 V
|
9 mm
|
2.5 kA
|
70 J
|
210 pF
|
- 40 C
|
+ 85 C
|
Bulk
|
|
|
|
壓敏電阻 ERZ-E 7mm 560V T&R ZNR Surge Absorber
- ERZ-E07E561
- Panasonic
-
1:
HK$4.60
-
943庫存量
|
Mouser 元件編號
667-ERZ-E07E561
|
Panasonic
|
壓敏電阻 ERZ-E 7mm 560V T&R ZNR Surge Absorber
|
|
943庫存量
|
|
|
HK$4.60
|
|
|
HK$2.86
|
|
|
HK$1.82
|
|
|
HK$1.65
|
|
|
檢視
|
|
|
HK$0.781
|
|
|
HK$1.38
|
|
|
HK$1.22
|
|
|
HK$1.09
|
|
|
HK$0.781
|
|
最少： 1
倍數： 1
:
5,000
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
350 VAC
|
450 VDC
|
560 V
|
930 V
|
9 mm
|
2.5 kA
|
75 J
|
200 pF
|
- 40 C
|
+ 85 C
|
Reel, Cut Tape
|
|
|
|
壓敏電阻 ERZ-E 8mm 470V T&R ZNR Surge Absorber
- ERZ-E08E471
- Panasonic
-
1:
HK$5.67
-
949庫存量
|
Mouser 元件編號
667-ERZ-E08E471
|
Panasonic
|
壓敏電阻 ERZ-E 8mm 470V T&R ZNR Surge Absorber
|
|
949庫存量
|
|
|
HK$5.67
|
|
|
HK$3.39
|
|
|
HK$2.19
|
|
|
HK$1.99
|
|
|
檢視
|
|
|
HK$1.02
|
|
|
HK$1.64
|
|
|
HK$1.40
|
|
|
HK$1.17
|
|
|
HK$1.02
|
|
最少： 1
倍數： 1
:
5,000
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
300 VAC
|
385 VDC
|
470 V
|
775 V
|
10.5 mm
|
3.5 kA
|
85 J
|
180 pF
|
- 40 C
|
+ 85 C
|
Reel, Cut Tape
|
|
|
|
壓敏電阻 ERZ-E 8mm 360V T&R ZNR Surge Absorber
- ERZ-E08F361
- Panasonic
-
1:
HK$5.59
-
4,190庫存量
|
Mouser 元件編號
667-ERZ-E08F361
|
Panasonic
|
壓敏電阻 ERZ-E 8mm 360V T&R ZNR Surge Absorber
|
|
4,190庫存量
|
|
|
HK$5.59
|
|
|
HK$3.27
|
|
|
HK$2.04
|
|
|
HK$1.85
|
|
|
檢視
|
|
|
HK$0.871
|
|
|
HK$1.55
|
|
|
HK$1.32
|
|
|
HK$1.20
|
|
|
HK$0.871
|
|
最少： 1
倍數： 1
:
5,000
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
230 VAC
|
300 VDC
|
360 V
|
595 V
|
10.5 mm
|
3.5 kA
|
65 J
|
280 pF
|
- 40 C
|
+ 85 C
|
Reel, Cut Tape
|
|
|
|
壓敏電阻 ERZ-E 11mm 270V Bulk ZNR Surge Absorber
- ERZ-E11A271CS
- Panasonic
-
1:
HK$6.17
-
988庫存量
|
Mouser 元件編號
667-ERZ-E11A271CS
|
Panasonic
|
壓敏電阻 ERZ-E 11mm 270V Bulk ZNR Surge Absorber
|
|
988庫存量
|
|
|
HK$6.17
|
|
|
HK$3.69
|
|
|
HK$2.31
|
|
|
HK$1.97
|
|
|
檢視
|
|
|
HK$1.73
|
|
|
HK$1.27
|
|
|
HK$1.20
|
|
最少： 1
倍數： 1
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
175 VAC
|
225 VDC
|
270 V
|
455 V
|
13 mm
|
6 kA
|
99 J
|
580 pF
|
- 40 C
|
+ 85 C
|
Bulk
|
|
|
|
壓敏電阻 ERZ-E 11mm 910V T&R ZNR Surge Absorber
- ERZ-E11F911
- Panasonic
-
1:
HK$8.06
-
450庫存量
|
Mouser 元件編號
667-ERZ-E11F911
|
Panasonic
|
壓敏電阻 ERZ-E 11mm 910V T&R ZNR Surge Absorber
|
|
450庫存量
|
|
|
HK$8.06
|
|
|
HK$4.85
|
|
|
HK$3.05
|
|
|
HK$2.68
|
|
|
HK$1.62
|
|
|
檢視
|
|
|
HK$1.59
|
|
|
HK$1.57
|
|
|
HK$1.50
|
|
最少： 1
倍數： 1
:
500
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
550 VAC
|
745 VDC
|
910 V
|
1.5 kV
|
14 mm
|
5 kA
|
255 J
|
240 pF
|
- 40 C
|
+ 85 C
|
Reel, Cut Tape
|
|
|
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
- ERZ-V05D330CS
- Panasonic
-
1:
HK$4.52
-
3,023庫存量
|
Mouser 元件編號
667-ERZ-V05D330CS
|
Panasonic
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
|
|
3,023庫存量
|
|
|
HK$4.52
|
|
|
HK$2.70
|
|
|
HK$1.67
|
|
|
HK$1.46
|
|
|
檢視
|
|
|
HK$1.30
|
|
|
HK$1.10
|
|
|
HK$0.978
|
|
|
HK$0.822
|
|
|
HK$0.773
|
|
最少： 1
倍數： 1
|
|
|
V
|
MOVs
|
PCB Mount
|
Radial
|
|
20 VAC
|
26 VDC
|
33 V
|
73 V
|
5 mm
|
250 A
|
1.1 J
|
1400 pF
|
- 40 C
|
+ 85 C
|
|
|
|
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
- ERZ-V09D201
- Panasonic
-
1:
HK$7.23
-
485庫存量
|
Mouser 元件編號
667-ERZ-V09D201
|
Panasonic
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
|
|
485庫存量
|
|
|
HK$7.23
|
|
|
HK$4.32
|
|
|
HK$2.72
|
|
|
HK$2.38
|
|
|
檢視
|
|
|
HK$2.04
|
|
|
HK$1.56
|
|
|
HK$1.50
|
|
|
HK$1.42
|
|
|
HK$1.35
|
|
最少： 1
倍數： 1
|
|
|
V
|
MOVs
|
PCB Mount
|
Radial
|
|
130 VAC
|
170 VDC
|
200 V
|
340 V
|
9 mm
|
3.5 kA
|
35 J
|
430 pF
|
- 40 C
|
+ 85 C
|
|
|
|
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
- ERZ-V09D220
- Panasonic
-
1:
HK$7.23
-
827庫存量
|
Mouser 元件編號
667-ERZ-V09D220
|
Panasonic
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
|
|
827庫存量
|
|
|
HK$7.23
|
|
|
HK$4.32
|
|
|
HK$2.72
|
|
|
HK$2.38
|
|
|
檢視
|
|
|
HK$2.04
|
|
|
HK$1.42
|
|
|
HK$1.41
|
|
|
HK$1.37
|
|
最少： 1
倍數： 1
|
|
|
V
|
MOVs
|
PCB Mount
|
Radial
|
|
14 VAC
|
18 VDC
|
22 V
|
43 V
|
9 mm
|
1 kA
|
|
0.011 uF
|
|
|
|
|
|
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
- ERZ-VA5D390
- Panasonic
-
1:
HK$4.69
-
1,939庫存量
|
Mouser 元件編號
667-ERZ-VA5D390
|
Panasonic
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
|
|
1,939庫存量
|
|
|
HK$4.69
|
|
|
HK$2.86
|
|
|
HK$1.82
|
|
|
HK$1.65
|
|
|
檢視
|
|
|
HK$1.41
|
|
|
HK$1.18
|
|
|
HK$0.888
|
|
|
HK$0.871
|
|
|
HK$0.847
|
|
最少： 1
倍數： 1
|
|
|
V
|
MOVs
|
PCB Mount
|
Radial
|
|
25 VAC
|
31 VDC
|
39 V
|
86 V
|
5 mm
|
250 A
|
1.2 J
|
700 pF
|
- 40 C
|
+ 85 C
|
|
|
|
|
壓敏電阻 ERZ-E 5mm 200V Bulk ZNR Surge Absorber
- ERZ-E05A201CS
- Panasonic
-
1:
HK$4.27
-
6,376庫存量
|
Mouser 元件編號
667-ERZ-E05A201CS
|
Panasonic
|
壓敏電阻 ERZ-E 5mm 200V Bulk ZNR Surge Absorber
|
|
6,376庫存量
|
|
|
HK$4.27
|
|
|
HK$2.74
|
|
|
HK$1.70
|
|
|
HK$1.44
|
|
|
檢視
|
|
|
HK$1.17
|
|
|
HK$0.814
|
|
|
HK$0.781
|
|
|
HK$0.674
|
|
最少： 1
倍數： 1
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
130 VAC
|
170 VDC
|
200 V
|
340 V
|
7 mm
|
1.2 kA
|
13 J
|
200 pF
|
- 40 C
|
+ 85 C
|
Bulk
|
|
|
|
壓敏電阻 ERZ-E 7mm 390V Bulk ZNR Surge Absorber
- ERZ-E07B391CS
- Panasonic
-
1:
HK$4.60
-
1,691庫存量
|
Mouser 元件編號
667-ERZ-E07B391CS
|
Panasonic
|
壓敏電阻 ERZ-E 7mm 390V Bulk ZNR Surge Absorber
|
|
1,691庫存量
|
|
|
HK$4.60
|
|
|
HK$2.98
|
|
|
HK$1.86
|
|
|
HK$1.56
|
|
|
檢視
|
|
|
HK$1.27
|
|
|
HK$1.11
|
|
|
HK$0.986
|
|
|
HK$0.682
|
|
最少： 1
倍數： 1
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
250 VAC
|
320 VDC
|
390 V
|
650 V
|
9 mm
|
2.5 kA
|
53 J
|
300 pF
|
- 40 C
|
+ 85 C
|
Bulk
|
|
|
|
壓敏電阻 ERZ-E 11mm 430V Bulk ZNR Surge Absorber
- ERZ-E11B431CS
- Panasonic
-
1:
HK$6.17
-
600庫存量
|
Mouser 元件編號
667-ERZ-E11B431CS
|
Panasonic
|
壓敏電阻 ERZ-E 11mm 430V Bulk ZNR Surge Absorber
|
|
600庫存量
|
|
|
HK$6.17
|
|
|
HK$3.69
|
|
|
HK$2.31
|
|
|
HK$1.97
|
|
|
檢視
|
|
|
HK$1.73
|
|
|
HK$1.55
|
|
|
HK$1.08
|
|
最少： 1
倍數： 1
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
275 VAC
|
350 VDC
|
430 V
|
710 V
|
13 mm
|
6 kA
|
155 J
|
400 pF
|
- 40 C
|
+ 85 C
|
Bulk
|
|
|
|
壓敏電阻 ERZ-E 11mm 470V T&R ZNR Surge Absorber
- ERZ-E11F471
- Panasonic
-
1:
HK$6.33
-
3,655庫存量
|
Mouser 元件編號
667-ERZ-E11F471
|
Panasonic
|
壓敏電阻 ERZ-E 11mm 470V T&R ZNR Surge Absorber
|
|
3,655庫存量
|
|
|
HK$6.33
|
|
|
HK$3.79
|
|
|
HK$2.38
|
|
|
HK$2.06
|
|
|
檢視
|
|
|
HK$1.10
|
|
|
HK$1.78
|
|
|
HK$1.59
|
|
|
HK$1.43
|
|
|
HK$1.10
|
|
最少： 1
倍數： 1
:
5,000
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
300 VAC
|
385 VDC
|
470 V
|
775 V
|
13 mm
|
6 kA
|
175 J
|
360 pF
|
- 40 C
|
+ 85 C
|
Reel, Cut Tape
|
|
|
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
- ERZ-V05V471CS
- Panasonic
-
1:
HK$4.52
-
919庫存量
|
Mouser 元件編號
667-ERZ-V05V471CS
|
Panasonic
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
|
|
919庫存量
|
|
|
HK$4.52
|
|
|
HK$2.70
|
|
|
HK$1.36
|
|
|
HK$1.34
|
|
|
檢視
|
|
|
HK$1.12
|
|
|
HK$0.88
|
|
|
HK$0.838
|
|
|
HK$0.83
|
|
|
HK$0.781
|
|
最少： 1
倍數： 1
|
|
|
V
|
MOVs
|
PCB Mount
|
Radial
|
|
300 VAC
|
385 VDC
|
470 V
|
810 V
|
5 mm
|
800 A
|
|
60 pF
|
|
|
|
|
|
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
- ERZ-V09D330
- Panasonic
-
1:
HK$7.23
-
101庫存量
|
Mouser 元件編號
667-ERZ-V09D330
|
Panasonic
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
|
|
101庫存量
|
|
|
HK$7.23
|
|
|
HK$4.32
|
|
|
HK$2.72
|
|
|
HK$2.38
|
|
|
檢視
|
|
|
HK$2.04
|
|
|
HK$1.42
|
|
|
HK$1.37
|
|
最少： 1
倍數： 1
|
|
|
V
|
MOVs
|
PCB Mount
|
Radial
|
|
20 VAC
|
26 VDC
|
33 V
|
65 V
|
9 mm
|
1 kA
|
4.8 J
|
6300 pF
|
- 40 C
|
+ 85 C
|
|
|
|
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
- ERZ-V09D330CS
- Panasonic
-
1:
HK$7.23
-
60庫存量
|
Mouser 元件編號
667-ERZ-V09D330CS
|
Panasonic
|
壓敏電阻 ZNR Transient/Surge Absorbers Type D
|
|
60庫存量
|
|
|
HK$7.23
|
|
|
HK$4.32
|
|
|
HK$2.48
|
|
|
HK$2.36
|
|
|
檢視
|
|
|
HK$2.04
|
|
|
HK$1.54
|
|
|
HK$1.47
|
|
|
HK$1.44
|
|
|
HK$1.41
|
|
最少： 1
倍數： 1
|
|
|
V
|
MOVs
|
PCB Mount
|
Radial
|
|
20 VAC
|
26 VDC
|
33 V
|
65 V
|
9 mm
|
1 kA
|
4.8 J
|
6300 pF
|
- 40 C
|
+ 85 C
|
|
|
香港