DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 9-18VDC Input, 12VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-12S12
Cincon
1:
$29.95
2 Có hàng
Mã Phụ tùng của Mouser
418-EC2SB-12S12
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 9-18VDC Input, 12VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
2 Có hàng
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
1 Output
10 W
12 V
833 mA
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 36-75VDC Input, 5VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-48S05
Cincon
1:
$29.94
8 Có hàng
Mã Phụ tùng của Mouser
418-EC2SB-48S05
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 36-75VDC Input, 5VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
8 Có hàng
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
1 Output
10 W
5 V
2 A
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 36-75VDC Input, 12VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-48S12
Cincon
1:
$29.95
1 Có hàng
Mã Phụ tùng của Mouser
418-EC2SB-48S12
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 36-75VDC Input, 12VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
1 Có hàng
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
1 Output
10 W
12 V
833 mA
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 4.7-9VDC Input, +/-15VDC Output, +/-333mA
EC2SB-05D15
Cincon
1:
$29.96
2 Đang đặt hàng
Mã Phụ tùng của Mouser
418-EC2SB-05D15
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 4.7-9VDC Input, +/-15VDC Output, +/-333mA
2 Đang đặt hàng
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
2 Output
10 W
15 V
333 mA
- 15 V
333 mA
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 18-36VDC Input, +/-15VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-24D15
Cincon
1:
$29.96
Thời gian giao Sản phẩm không Lưu kho 6 Tuần
Mã Phụ tùng của Mouser
418-EC2SB-24D15
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 18-36VDC Input, +/-15VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
Thời gian giao Sản phẩm không Lưu kho 6 Tuần
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
2 Output
10 W
15 V
333 mA
- 15 V
333 mA
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 4.7-9VDC Input, +/-5VDC Output, +/-1000mA
EC2SB-05D05
Cincon
1:
$29.96
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-05D05
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 4.7-9VDC Input, +/-5VDC Output, +/-1000mA
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
2 Output
10 W
5 V
1 A
- 5 V
1 A
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 4.7-9VDC Input, +/-12VDC Output, +/-416mA
EC2SB-05D12
Cincon
1:
$29.96
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-05D12
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 4.7-9VDC Input, +/-12VDC Output, +/-416mA
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
2 Output
10 W
12 V
416 mA
- 12 V
416 mA
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 4.7-9VDC Input, 5VDC Output, 2000mA
EC2SB-05S05
Cincon
1:
$27.93
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-05S05
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 4.7-9VDC Input, 5VDC Output, 2000mA
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
1 Output
10 W
5 V
2 A
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 4.7-9VDC Input, 12VDC Output, 833mA
EC2SB-05S12
Cincon
1:
$29.95
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-05S12
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 4.7-9VDC Input, 12VDC Output, 833mA
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
1 Output
10 W
12 V
833 mA
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 4.7-9VDC Input, 15VDC Output, 666mA
EC2SB-05S15
Cincon
1:
$29.95
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-05S15
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 4.7-9VDC Input, 15VDC Output, 666mA
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
1 Output
10 W
15 V
666 mA
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 4.7-9VDC Input, 3.3VDC Output, 2500mA
EC2SB-05S33
Cincon
1:
$29.95
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-05S33
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 4.7-9VDC Input, 3.3VDC Output, 2500mA
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
1 Output
10 W
3.3 V
2.5 A
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 9-18VDC Input, +/-5VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-12D05
Cincon
1:
$29.96
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-12D05
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 9-18VDC Input, +/-5VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
2 Output
10 W
5 V
1 A
- 5 V
1 A
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 9-18VDC Input, +/-12VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-12D12
Cincon
1:
$29.96
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-12D12
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 9-18VDC Input, +/-12VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
2 Output
10 W
12 V
416 mA
- 12 V
416 mA
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 9-18VDC Input, +/-15VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-12D15
Cincon
1:
$29.96
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-12D15
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 9-18VDC Input, +/-15VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
2 Output
10 W
15 V
333 mA
- 15 V
333 mA
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 9-18VDC Input, 5VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-12S05
Cincon
1:
$29.95
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-12S05
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 9-18VDC Input, 5VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
1 Output
10 W
5 V
2 A
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 9-18VDC Input, 15VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-12S15
Cincon
1:
$27.03
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-12S15
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 9-18VDC Input, 15VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
1 Output
10 W
15 V
666 mA
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 9-18VDC Input, 3.3VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-12S33
Cincon
1:
$29.95
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-12S33
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 9-18VDC Input, 3.3VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
1 Output
10 W
3.3 V
2.5 A
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 18-36VDC Input, +/-5VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-24D05
Cincon
1:
$27.97
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-24D05
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 18-36VDC Input, +/-5VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
2 Output
10 W
5 V
1 A
- 5 V
1 A
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 18-36VDC Input, +/-12VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-24D12
Cincon
1:
$27.08
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-24D12
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 18-36VDC Input, +/-12VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
2 Output
10 W
12 V
416 mA
- 12 V
416 mA
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 18-36VDC Input, 5VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-24S05
Cincon
1:
$30.75
Thời gian giao Sản phẩm không Lưu kho 13 Tuần
Mã Phụ tùng của Mouser
418-EC2SB-24S05
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 18-36VDC Input, 5VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
Thời gian giao Sản phẩm không Lưu kho 13 Tuần
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
1 Output
10 W
5 V
2 A
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 18-36VDC Input, 12VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-24S12
Cincon
1:
$27.03
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-24S12
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 18-36VDC Input, 12VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
1 Output
10 W
12 V
833 mA
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 18-36VDC Input, 15VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-24S15
Cincon
1:
$29.95
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-24S15
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 18-36VDC Input, 15VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
1 Output
10 W
15 V
666 mA
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 18-36VDC Input, 3.3VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-24S33
Cincon
1:
$29.94
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-24S33
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 18-36VDC Input, 3.3VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
1 Output
10 W
3.3 V
2.5 A
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 36-75VDC Input, +/-5VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-48D05
Cincon
1:
$27.08
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-48D05
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 36-75VDC Input, +/-5VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
2 Output
10 W
5 V
1 A
- 5 V
1 A
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 36-75VDC Input, +/-12VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
EC2SB-48D12
Cincon
1:
$29.96
Không Lưu kho
Mã Phụ tùng của Mouser
418-EC2SB-48D12
Cincon
DC/DC Converters - Through Hole DC-DC Converter, 10 Watt, 2:1 Input Range, 36-75VDC Input, +/-12VDC Output, 1.5KVDC min. Isolation, Black Coated Copper with Non-Conductive Base, Thru-Hole, 25.4x25.4x10.2mm
Không Lưu kho
Mua
Tối thiểu: 1
Nhiều: 1
Các chi tiết
Isolated
2 Output
10 W
12 V
416 mA
- 12 V
416 mA
1.5 kV
25.4 mm (1 in)
25.4 mm (1 in)
10.2 mm (0.402 in)
Industrial
+ 85 C
- 40 C
EC2SB