Led xbd ryl blue 455nm 500mw smd - Allicdata Electronics

Related Categories

< 1 2 3 4 5 >

Allicdata Part#	Mft.Part#	Company	Spec.	QTY.	Pricing(USD)
LH1501BAB-ND	LH1501BAB	Vishay Semiconductor Opto Division	View more Series: LH1501 Packaging: Tube Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NC (1 Form B) Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 350V Load Current: 150mA On-State Resistance (Max): 20 Ohms Termination Style: Gull Wing Package / Case: 6-SMD (0.300", 7.62mm) Supplier Device Package: 6-SMD	1504 Order	--
LH1520AACTR-ND	LH1520AACTR	Vishay Semiconductor Opto Division	View more Series: LH1520 Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 350V Load Current: 110mA On-State Resistance (Max): 20 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	--
LH1544AAC-ND	LH1544AAC	Vishay Semiconductor Opto Division	View more Series: LH1544 Packaging: Tube Part Status: Obsolete Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.19VDC Voltage - Load: 0V ~ 200V Load Current: 40mA On-State Resistance (Max): 110 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	--
LH1521BACTR-ND	LH1521BACTR	Vishay Semiconductor Opto Division	View more Series: LH1521 Packaging: Tape & Reel (TR) Part Status: Obsolete Mounting Type: Surface Mount Circuit: SPST-NC (1 Form B) x 2 Output Type: AC, DC Voltage - Input: 1.22VDC Voltage - Load: 0V ~ 350V Load Current: 110mA On-State Resistance (Max): 20 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	1+: $0
LH1533AACTR-ND	LH1533AACTR	Vishay Semiconductor Opto Division	View more Series: LH1533 Packaging: Tape & Reel (TR) Part Status: Obsolete Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.2VDC Voltage - Load: 0V ~ 350V Load Current: 90mA On-State Resistance (Max): 28 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	--
LH1556AAC-ND	LH1556AAC	Vishay Semiconductor Opto Division	View more Series: LH1556 Packaging: Tube Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 350V Load Current: 120mA On-State Resistance (Max): 28 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	2000 Order	1+: $2.3121 10+: $2.1704 25+: $1.9291 50+: $1.8327 100+: $1.7362 250+: $1.5433 500+: $1.4468 1000+: $1.3503
LH1523BACTRTR-N D	LH1523BACTR	Vishay Semiconductor Opto Division	View more Series: LH1523 Packaging: Tape & Reel (TR) Part Status: Obsolete Mounting Type: Surface Mount Circuit: SPST-NC (1 Form B) x 2 Output Type: AC, DC Voltage - Input: 1.22VDC Voltage - Load: 0V ~ 200V Load Current: 200mA On-State Resistance (Max): 10 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	1+: $0
LH1511BABTRTR-N D	LH1511BABTR	Vishay Semiconductor Opto Division	View more Series: LH1511 Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NC (1 Form B) Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 200V Load Current: 200mA On-State Resistance (Max): 10 Ohms Termination Style: Gull Wing Package / Case: 6-SMD (0.300", 7.62mm) Supplier Device Package: 6-SMD	1000 Order	1000+: $1.1978 3000+: $1.1764 5000+: $1.155
LH1503AAC-ND	LH1503AAC	Vishay Semiconductor Opto Division	View more Series: LH1503 Packaging: Tube Part Status: Obsolete Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 350V Load Current: 110mA On-State Resistance (Max): 20 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	--
LH1512BAC-ND	LH1512BAC	Vishay Semiconductor Opto Division	View more Series: LH1512 Packaging: Tube Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO + SPST-NC (1 Form A and B) Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 200V Load Current: 200mA On-State Resistance (Max): 10 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1397 Order	--
LH1556AACTR-ND	LH1556AACTR	Vishay Semiconductor Opto Division	View more Series: LH1556 Packaging: Tape & Reel (TR) Part Status: Obsolete Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 350V Load Current: 120mA On-State Resistance (Max): 28 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	1+: $0
LH1502BACTR-ND	LH1502BACTR	Vishay Semiconductor Opto Division	View more Series: LH1502 Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO + SPST-NC (1 Form A and B) Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 350V Load Current: 150mA On-State Resistance (Max): 20 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	--
LH1505AACTR-ND	LH1505AACTR	Vishay Semiconductor Opto Division	View more Series: LH1505 Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 250V Load Current: 120mA On-State Resistance (Max): 15 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	--
LH1502BAC-ND	LH1502BAC	Vishay Semiconductor Opto Division	View more Series: LH1502 Packaging: Tube Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO + SPST-NC (1 Form A and B) Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 350V Load Current: 150mA On-State Resistance (Max): 20 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1924 Order	--
LH1512BACTRTR-N D	LH1512BACTR	Vishay Semiconductor Opto Division	View more Series: LH1512 Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO + SPST-NC (1 Form A and B) Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 200V Load Current: 200mA On-State Resistance (Max): 10 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	--
255-1427-2-ND	AQW214EAX	Panasonic Electric Works	View more Series: PhotoMOS AQW Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.14VDC Voltage - Load: 0V ~ 400V Load Current: 100mA On-State Resistance (Max): 50 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	3000 Order	1000+: $1.4994 3000+: $1.4726
LH1522AACTR-ND	LH1522AACTR	Vishay Semiconductor Opto Division	View more Series: LH1522 Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 200V Load Current: 120mA On-State Resistance (Max): 10 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	--
255-2133-2-ND	AQW214EHAX	Panasonic Electric Works	View more Series: PhotoMOS AQW Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.14VDC Voltage - Load: 0V ~ 400V Load Current: 100mA On-State Resistance (Max): 35 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	3000 Order	--
255-3384-2-ND	AQW214EAZ	Panasonic Electric Works	View more Series: PhotoMOS AQW Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.14VDC Voltage - Load: 0V ~ 400V Load Current: 100mA On-State Resistance (Max): 50 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	13000 Order	1000+: $1.4994 3000+: $1.4726
LH1503AACTR-ND	LH1503AACTR	Vishay Semiconductor Opto Division	View more Series: LH1503 Packaging: Tape & Reel (TR) Part Status: Obsolete Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 350V Load Current: 110mA On-State Resistance (Max): 20 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	--
LH1513AAC-ND	LH1513AAC	Vishay Semiconductor Opto Division	View more Series: LH1513 Packaging: Tube Part Status: Obsolete Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 200V Load Current: 140mA On-State Resistance (Max): 10 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	1+: $0
LH1511BAB-ND	LH1511BAB	Vishay Semiconductor Opto Division	View more Series: LH1511 Packaging: Tube Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NC (1 Form B) Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 200V Load Current: 200mA On-State Resistance (Max): 10 Ohms Termination Style: Gull Wing Package / Case: 6-SMD (0.300", 7.62mm) Supplier Device Package: 6-SMD	92 Order	1+: $2.0538 10+: $1.9253 25+: $1.7111 50+: $1.6255 100+: $1.54 250+: $1.3689 500+: $1.2833 1000+: $1.1978 5000+: $1.155
LH1522AAC-ND	LH1522AAC	Vishay Semiconductor Opto Division	View more Series: LH1522 Packaging: Tube Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 200V Load Current: 120mA On-State Resistance (Max): 10 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	4000 Order	--
255-3537-2-ND	AQW210EHAX	Panasonic Electric Works	View more Series: PhotoMOS AQW Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.14VDC Voltage - Load: 0V ~ 350V Load Current: 120mA On-State Resistance (Max): 25 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	--
LH1505AAC-ND	LH1505AAC	Vishay Semiconductor Opto Division	View more Series: LH1505 Packaging: Tube Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.26VDC Voltage - Load: 0V ~ 250V Load Current: 120mA On-State Resistance (Max): 15 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	1+: $3.2886 10+: $3.082 25+: $2.7392 50+: $2.6023 100+: $2.4653 250+: $2.1914 500+: $2.0544 1000+: $1.9175
LH1544AACTR-ND	LH1544AACTR	Vishay Semiconductor Opto Division	View more Series: LH1544 Packaging: Tape & Reel (TR) Part Status: Obsolete Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.19VDC Voltage - Load: 0V ~ 200V Load Current: 40mA On-State Resistance (Max): 110 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	1+: $0
LH1526AACTRTR-N D	LH1526AACTR	Vishay Semiconductor Opto Division	View more Series: LH1526 Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) x 2 Output Type: AC, DC Voltage - Input: 1.15VDC Voltage - Load: 0V ~ 400V Load Current: 100mA On-State Resistance (Max): 25 Ohms Termination Style: Gull Wing Package / Case: 8-SMD (0.300", 7.62mm) Supplier Device Package: 8-SMD	1000 Order	1000+: $2.0974 3000+: $2.06
255-5857-2-ND	AQV414EHAX	Panasonic Electric Works	View more Series: PhotoMOS AQV Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NC (1 Form B) Output Type: AC, DC Voltage - Input: 1.14VDC Voltage - Load: 0V ~ 400V Load Current: 120mA On-State Resistance (Max): 50 Ohms Termination Style: Gull Wing Package / Case: 6-SMD (0.300", 7.62mm) Supplier Device Package: 6-SMD	1000 Order	--
PS710AL-1A-E3-N D	PS710AL-1A-E3	CEL	View more Series: PS, OCMOS Packaging: Tape & Reel (TR) Part Status: Obsolete Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) Output Type: AC, DC Voltage - Input: 1.2VDC Voltage - Load: 0V ~ 60V Load Current: 1.8A On-State Resistance (Max): 200 mOhms Termination Style: Gull Wing Package / Case: 6-SMD (0.300", 7.62mm) Supplier Device Package: 6-DIP Gull Wing	1000 Order	--
PS710AL-1A-E3-A -ND	PS710AL-1A-E3-A	CEL	View more Series: PS, OCMOS Packaging: Tape & Reel (TR) Part Status: Obsolete Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) Output Type: AC, DC Voltage - Input: 1.2VDC Voltage - Load: 0V ~ 60V Load Current: 1.8A On-State Resistance (Max): 200 mOhms Termination Style: Gull Wing Package / Case: 6-SMD (0.300", 7.62mm) Supplier Device Package: 6-DIP Gull Wing	1000 Order	--
255-1957-2-ND	AQV257AX	Panasonic Electric Works	View more Series: PhotoMOS AQV Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) Output Type: AC, DC Voltage - Input: 1.14VDC Voltage - Load: 0V ~ 200V Load Current: 250mA On-State Resistance (Max): 4 Ohms Termination Style: Gull Wing Package / Case: 6-SMD (0.300", 7.62mm) Supplier Device Package: 6-SMD	3000 Order	--
VOR1142B4TTR-ND	VOR1142B4T	Vishay Semiconductor Opto Division	View more Series: VOR1142 Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) Output Type: AC, DC Voltage - Input: 1.36VDC Voltage - Load: 0V ~ 400V Load Current: 140mA On-State Resistance (Max): 27 Ohms Termination Style: Gull Wing Package / Case: 4-SMD (0.300", 7.62mm) Supplier Device Package: 4-SMD	1000 Order	1000+: $0.635 3000+: $0.6237 5000+: $0.6124 10000+: $0.6033
PLA140S-ND	PLA140S	IXYS Integrated Circuits Division	View more Series: PLA, OptoMOS Packaging: Tube Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) Output Type: AC, DC Voltage - Input: 1.2VDC Voltage - Load: 0V ~ 400V Load Current: 250mA On-State Resistance (Max): 8 Ohms Termination Style: Gull Wing Package / Case: 6-SMD (0.300", 7.62mm) Supplier Device Package: 6-SMD	1000 Order	--
AQY221N3M1Y-ND	AQY221N3M1Y	Panasonic Electric Works	View more Series: PhotoMOS AQY Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) Output Type: AC, DC (RF) Voltage - Input: 1.14VDC Voltage - Load: 0V ~ 25V Load Current: 150mA On-State Resistance (Max): 7.5 Ohms Termination Style: SMD (SMT) Tab Package / Case: 4-SMD (0.116", 2.95mm) Supplier Device Package: 4-SON	1000 Order	1000+: $3.6338
Z2075TR-ND	G3VM-21LR(TR05)	Omron Electronics Inc-EMC Div	View more Series: G3VM Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) Output Type: AC, DC Voltage - Input: 1.15VDC Voltage - Load: 0V ~ 20V Load Current: 160mA On-State Resistance (Max): 8 Ohms Termination Style: SMD (SMT) Tab Package / Case: 4-SMD (0.165", 4.20mm) Supplier Device Package: 4-SSOP	3500 Order	500+: $2.9189
255-4082-5-ND	AQV103A	Panasonic Electric Works	View more Series: PhotoMOS AQV Packaging: Tube Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) Output Type: DC Voltage - Input: 2.3VDC Voltage - Load: 0V ~ 250V Load Current: 300mA On-State Resistance (Max): 4 Ohms Termination Style: Gull Wing Package / Case: 6-SMD (0.300", 7.62mm) Supplier Device Package: 6-SMD	49 Order	1+: $4.5801 10+: $4.2953 25+: $3.8178 50+: $3.6269 100+: $3.436 250+: $3.0542 500+: $2.8634 1000+: $2.6725
G3VM-41PR12-ND	G3VM-41PR12	Omron Electronics Inc-EMC Div	View more Series: G3VM Packaging: Bulk Part Status: Obsolete Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) Output Type: AC, DC Voltage - Input: 1.15VDC Voltage - Load: 0V ~ 40V Load Current: 100mA On-State Resistance (Max): 20 Ohms Termination Style: SMD (SMT) Tab Package / Case: 4-SMD (0.128", 3.25mm) Supplier Device Package: 4-USOP	1000 Order	1+: $0
255-3916-2-ND	AQV258HAZ	Panasonic Electric Works	View more Series: PhotoMOS AQV Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) Output Type: AC, DC Voltage - Input: 1.14VDC Voltage - Load: 0V ~ 1500V Load Current: 20mA On-State Resistance (Max): 500 Ohms Termination Style: Gull Wing Package / Case: 6-SMD (0.300", 7.62mm) Supplier Device Package: 6-SMD	3000 Order	1000+: $2.4961
CLA349TR-ND	CPC1963GSTR	IXYS Integrated Circuits Division	View more Series: CPC Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) Output Type: AC, Zero Cross Voltage - Input: 1.2VDC Voltage - Load: 0V ~ 600V Load Current: 500mA Termination Style: Gull Wing Package / Case: 6-SMD (0.300", 7.62mm) Supplier Device Package: 6-SMD	2000 Order	1000+: $1.0937 2000+: $1.039 5000+: $0.9999
Z3662TR-ND	G3VM-41PR11(TR0 5)	Omron Electronics Inc-EMC Div	View more Series: G3VM Packaging: Tape & Reel (TR) Part Status: Active Mounting Type: Surface Mount Circuit: SPST-NO (1 Form A) Output Type: AC, DC Voltage - Input: 1.15VDC Voltage - Load: 0V ~ 40V Load Current: 140mA On-State Resistance (Max): 10 Ohms Termination Style: SMD (SMT) Tab Package / Case: 4-SMD (0.128", 3.25mm) Supplier Device Package: 4-USOP	1000 Order	--

< 1 2 3 4 5 >

Hot Searches: led xbd ryl blue 455nm 500mw smd led xbd ryl blue 460nm 500mw smd led xbd ryl blue 457nm 500mw smd led xbd ryl blue 453nm 500mw smd led xbd ryl blue 458nm 500mw smd led xbd ryl blue 463nm 500mw smd led xbd ryl blue 455nm 450mw smd led xbd ryl blue 455nm 475mw smd led xbd ryl blue 455nm 525mw smd led xbd ryl blue 455nm 550mw smd led ryl blue 455nm 2smd led xte 455nm roy blue 500mw smd led xbd ryl blue 458nm 550mw smd led xbd ryl blue 458nm 450mw smd led xbd ryl blue 460nm 450mw smd led xbd ryl blue 458nm 475mw smd led xbd ryl blue 453nm 450mw smd led xbd ryl blue 463nm 450mw smd led xbd ryl blue 457nm 450mw smd led xbd ryl blue 460nm 475mw smd

Search Result:led xbd ryl blue 455nm 500mw smd

Related Categories