High-speed mode interface ic - Allicdata Electronics

Related Categories

1 2 3 4 5 >

Allicdata Part#	Mft.Part#	Company	Spec.	QTY.	Pricing(USD)
ISA-INTERFACE-N D	ISA-INTERFACE	Silicon Labs	View more Series: * Part Status: Active Lead Free Status / RoHS Status: Not applicable / Not applicable	1000 Order	1+: $12.5685
KIT,JACKSCREW,H IGH-ND	KIT,JACKSCREW,H IGH	ITT Cannon, LLC	View more Packaging: Bulk Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active	1000 Order	1+: $15.435 5+: $13.4959 10+: $13.15 25+: $12.3888 50+: $11.5583
BX-5-IC/V-IC/V- IC/5-IC/5-ND	BX-5-IC/V-IC/V- IC/5-IC/5	Sensata-BEI Sensors	View more Part Status: Active Amplifier Type: External Input Voltage - Supply: 5 V ~ 28 V Output Type: Analog Current - Supply: 125mA Mounting Type: DIN Rail	1000 Order	1+: $403.2
1892BK03-HIGH-P ERF-RIBBON-ND	1892BK03-HIGH-P ERF-RIBBON	TE Connectivity Raychem Cable Protection	View more Part Status: Obsolete Lead Free Status / RoHS Status: Lead free / RoHS Compliant Accessory Type: Dot Matrix Ribbon Moisture Sensitivity Level (MSL): 1 (Unlimited) For Use With/Related Products: AM631O Printers	1000 Order	1+: $0
BS2I-IC-ND	BS2I-IC	Parallax Inc.	View more Series: BASIC Stamp Part Status: Obsolete Module/Board Type: MCU Core Core Processor: PIC16C57C Speed: 20MHz Flash Size: 2KB EEPROM RAM Size: 32B Size / Dimension: 1.2" x 0.6" (30mm x 15mm) Operating Temperature: -40C ~ 85C	1000 Order	1+: $0
JS1-IC-ND	JS1-IC	Parallax Inc.	View more Series: Javelin Part Status: Obsolete Module/Board Type: MPU Core Core Processor: SX48AC Flash Size: 32KB EEPROM RAM Size: 32KB Connector Type: 24-DIP Size / Dimension: 1.2" x 0.6" (30mm x 15mm) Operating Temperature: 0C ~ 70C	1000 Order	1+: $0
SS1-IC-ND	SS1-IC	Parallax Inc.	View more Series: Propeller Part Status: Obsolete Module/Board Type: MPU Core Core Processor: Propeller, P8X32A-M44 Speed: 10MHz Flash Size: 32KB ROM RAM Size: 32KB Connector Type: 24-DIP Size / Dimension: 1.2" x 0.63" (31mm x 16mm)	1000 Order	1+: $0
BS2SX-IC-ND	BS2SX-IC	Parallax Inc.	View more Series: BASIC Stamp Part Status: Obsolete Module/Board Type: MCU Core Core Processor: SX28AC Speed: 50MHz Flash Size: 16KB EEPROM RAM Size: 32B Size / Dimension: 1.2" x 0.6" (30mm x 15mm) Operating Temperature: 0C ~ 70C	1000 Order	1+: $0
BS2E-IC-ND	BS2E-IC	Parallax Inc.	View more Series: BASIC Stamp Part Status: Obsolete Module/Board Type: MCU Core Core Processor: SX28AC Speed: 20MHz Flash Size: 16KB EEPROM RAM Size: 32B Size / Dimension: 1.2" x 0.6" (30mm x 15mm) Operating Temperature: 0C ~ 70C	1000 Order	1+: $0
ICS-51360-ND	ICS-51360	TDK InvenSense	View more Series: ICS-51360 Part Status: Active Lead Free Status / RoHS Status: Contains lead / RoHS Compliant Type: MEMS (Silicon) Moisture Sensitivity Level (MSL): 1 (Unlimited) Output Type: Digital, PDM Direction: Omnidirectional Frequency Range: 50Hz ~ 20kHz Sensitivity: -36dB 1dB @ 94dB SPL S/N Ratio: 62dB Voltage - Rated: 1.8V Voltage Range: 1.65V ~ 3.63V Current - Supply: 730A Port Location: Bottom Termination: Solder Pads Size / Dimension: 0.138" L x 0.104" W (3.50mm x 2.65mm) Height (Max): 0.039" (0.98mm) Shape: Rectangular	1000 Order	10000+: $1.0868
ICS-41352-ND	ICS-41352	TDK InvenSense	View more Series: ICS-41352 Part Status: Active Lead Free Status / RoHS Status: Contains lead / RoHS Compliant Type: MEMS (Silicon) Moisture Sensitivity Level (MSL): 1 (Unlimited) Output Type: Digital, PDM Direction: Omnidirectional Frequency Range: 85kHz Sensitivity: -26dB 1dB @ 94dB SPL S/N Ratio: 64dB Voltage - Rated: 1.8V Voltage Range: 1.65V ~ 3.63V Current - Supply: 600A Port Location: Bottom Termination: Solder Pads Size / Dimension: 0.138" L x 0.104" W (3.50mm x 2.65mm) Height (Max): 0.039" (0.98mm) Shape: Rectangular	1000 Order	10000+: $1.3175
BX-5-DB/V-IC/V- IC/V-IC/V-ND	BX-5-DB/V-IC/V- IC/V-IC/V	Sensata-BEI Sensors	View more Part Status: Active Accessory Type: Interface Module For Use With/Related Products: BEI Encoders	1000 Order	1+: $457.21
AT91SAM-ICE-ND	AT91SAM-ICE	Microchip Technology	View more Series: AT91SAM Smart ARM Part Status: Active Type: Emulator (In-Circuit/In-System) For Use With/Related Products: ARM Contents: Board(s)	133 Order	1+: $97.335
558F-ICE-ND	558F-ICE	3M	View more Series: * Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited)	1000 Order	6+: $8.3822
SSSE13(IC)-ND	SSSE13(IC)	Omron Automation and Safety	View more Series: * Part Status: Active	1000 Order	1+: $0.63
ATATMEL-ICE-ND	ATATMEL-ICE	Microchip Technology	View more Part Status: Active Type: Debugger, Emulator, Programmer (In-Circuit/In-System) For Use With/Related Products: ARM, AVR Contents: Board(s), Cable(s)	418 Order	1+: $84.357
RN/0805-HIGH-LA B-KIT-ND	RN/0805-HIGH-LA B-KIT	TE Connectivity AMP Connectors	View more Series: * Part Status: Active	1000 Order	10+: $350.635
RN/0603-HIGH-LA B-KIT-ND	RN/0603-HIGH-LA B-KIT	TE Connectivity AMP Connectors	View more Series: * Part Status: Active	1000 Order	10+: $350.635
ATATMEL-ICE-ADP T-ND	ATATMEL-ICE-ADP T	Microchip Technology	View more Part Status: Active Lead Free Status / RoHS Status: Lead free / RoHS Compliant Accessory Type: Adapter Board Moisture Sensitivity Level (MSL): 1 (Unlimited) For Use With/Related Products: Atmel-ICE	4 Order	1+: $31.8906
ATATMEL-ICE-CAB LE-ND	ATATMEL-ICE-CAB LE	Microchip Technology	View more Part Status: Active Lead Free Status / RoHS Status: Lead free / RoHS Compliant Accessory Type: Cable Assembly Moisture Sensitivity Level (MSL): 1 (Unlimited) For Use With/Related Products: Atmel-ICE	262 Order	1+: $14.6979
IC-316-SGG-ND	IC-316-SGG	Samtec Inc.	View more Series: IC Packaging: Bulk Part Status: Obsolete Type: DIP, 0.3" (7.62mm) Row Spacing Number of Positions or Pins (Grid): 16 (2 x 8) Pitch - Mating: 0.100" (2.54mm) Contact Finish - Mating: Gold Contact Finish Thickness - Mating: 30.0in (0.76m) Contact Material - Mating: Beryllium Copper Mounting Type: Through Hole Features: Open Frame Termination: Solder Pitch - Post: 0.100" (2.54mm) Contact Finish - Post: Gold Contact Finish Thickness - Post: 30.0in (0.76m) Contact Material - Post: Phosphor Bronze Housing Material: Polyester, Glass Filled Operating Temperature: -55C ~ 125C Termination Post Length: 0.125" (3.18mm) Material Flammability Rating: UL94 V-0 Current Rating: 1A Contact Resistance: 10 mOhm	1000 Order	1+: $0
IC-316-SGT-ND	IC-316-SGT	Samtec Inc.	View more Series: IC Packaging: Bulk Part Status: Obsolete Type: DIP, 0.3" (7.62mm) Row Spacing Number of Positions or Pins (Grid): 16 (2 x 8) Pitch - Mating: 0.100" (2.54mm) Contact Finish - Mating: Gold Contact Finish Thickness - Mating: 30.0in (0.76m) Contact Material - Mating: Beryllium Copper Mounting Type: Through Hole Features: Open Frame Termination: Solder Pitch - Post: 0.100" (2.54mm) Contact Finish - Post: Gold Contact Finish Thickness - Post: 10.0in (0.25m) Contact Material - Post: Phosphor Bronze Housing Material: Polyester, Glass Filled Operating Temperature: -55C ~ 125C Termination Post Length: 0.125" (3.18mm) Material Flammability Rating: UL94 V-0 Current Rating: 1A Contact Resistance: 10 mOhm	1000 Order	1+: $0
IC-628-SGT-ND	IC-628-SGT	Samtec Inc.	View more Series: IC Packaging: Bulk Part Status: Obsolete Type: DIP, 0.6" (15.24mm) Row Spacing Number of Positions or Pins (Grid): 28 (2 x 14) Pitch - Mating: 0.100" (2.54mm) Contact Finish - Mating: Gold Contact Finish Thickness - Mating: 30.0in (0.76m) Contact Material - Mating: Beryllium Copper Mounting Type: Through Hole Features: Open Frame Termination: Solder Pitch - Post: 0.100" (2.54mm) Contact Finish - Post: Gold Contact Finish Thickness - Post: 10.0in (0.25m) Contact Material - Post: Phosphor Bronze Housing Material: Polyester, Glass Filled Operating Temperature: -55C ~ 125C Termination Post Length: 0.125" (3.18mm) Material Flammability Rating: UL94 V-0 Current Rating: 1A Contact Resistance: 10 mOhm	1000 Order	1+: $0
IC-628-SGG-ND	IC-628-SGG	Samtec Inc.	View more Series: IC Packaging: Bulk Part Status: Active Type: DIP, 0.6" (15.24mm) Row Spacing Number of Positions or Pins (Grid): 28 (2 x 14) Pitch - Mating: 0.100" (2.54mm) Contact Finish - Mating: Gold Contact Finish Thickness - Mating: 30.0in (0.76m) Contact Material - Mating: Beryllium Copper Mounting Type: Through Hole Features: Open Frame Termination: Solder Pitch - Post: 0.100" (2.54mm) Contact Finish - Post: Gold Contact Finish Thickness - Post: 30.0in (0.76m) Contact Material - Post: Phosphor Bronze Housing Material: Polyester, Glass Filled Operating Temperature: -55C ~ 125C Termination Post Length: 0.125" (3.18mm) Material Flammability Rating: UL94 V-0 Current Rating: 1A Contact Resistance: 10 mOhm	1000 Order	1+: $3.402
UF1050B-IC-ECT- ND	UF1050B-IC-E	Qualcomm	View more Packaging: Cut Tape (CT) Part Status: Obsolete Type: TxRx Only RF Family/Standard: WiFi Protocol: 802.11b/g Frequency: 2.4GHz Data Rate (Max): 54Mbps Voltage - Supply: 1.5V Package / Case: 88-BGA, WLCSP	1000 Order	--
UF1050A-IC-ETR- ND	UF1050A-IC-E	Qualcomm	View more Packaging: Tape & Reel (TR) Part Status: Obsolete Type: TxRx Only RF Family/Standard: WiFi Protocol: 802.11b/g Frequency: 2.4GHz Data Rate (Max): 54Mbps Voltage - Supply: 1.5V Package / Case: 88-BGA, WLCSP	1000 Order	1+: $0
EMMA120110-P6RP -IC-ND	EMMA120110-P6RP -IC	CUI Inc.	View more Series: EMMA 15W Part Status: Active Region Utilized: International Form: Wall Mount Input Type: Multi-Blade (Included) Voltage - Input: 90 ~ 264 VAC Voltage - Output: 12V Current - Output (Max): 1.1A Power (Watts): 13W No Load Power Consumption: 300mW (Max) Polarization: Positive Center Applications: Medical Efficiency: Level V Operating Temperature: 0C ~ 50C Output Connector: Barrel Plug R/A, 2.5mm I.D. x 5.5mm O.D. x 9.5mm Size / Dimension: 3.17" L x 1.89" W x 1.71" H (80.6mm x 47.9mm x 43.3mm) Approvals: CE, cURus, GS Input Connector: Multi-Blade Cord Length: 70.9" (1.80m) Weight: 0.287 lb (130.18g)	1000 Order	250+: $14.9146
DMS180165-P5P-I C-ND	DMS180165-P5P-I C	CUI Inc.	View more Part Status: Obsolete Region Utilized: International Form: Wall Mount Input Type: Multi-Blade (Included) Voltage - Input: 90 ~ 264 VAC Voltage - Output: 18V Current - Output (Max): 1.65A Power (Watts): 30W Polarization: Positive Center Applications: ITE (Commercial) Efficiency: 75% Operating Temperature: 0C ~ 40C Output Connector: Barrel Plug, 2.1mm I.D. x 5.5mm O.D. x 9.5mm Size / Dimension: 4.24" L x 2.27" W x 1.32" H (107.7mm x 57.7mm x 33.5mm) Approvals: CE, cULus, TUVgs Input Connector: Multi-Blade Cord Length: 70.9" (1.80m) Weight: 0.625 lb (283.5g)	1000 Order	1+: $0
ADI-CS100-IC-ND	ADI-CS100-IC	Omron Automation and Safety	View more Part Status: Active Applications: ITE (Commercial)	1000 Order	1+: $253.499
ETMA180333UD-P6 P-IC-ND	ETMA180333UD-P6 P-IC	CUI Inc.	View more Series: ETMA 60W Part Status: Active Region Utilized: International Form: Desktop (Class II) Input Type: Cord (Sold Separately) Voltage - Input: 90 ~ 264 VAC Voltage - Output: 18V Current - Output (Max): 3.33A Power (Watts): 60W No Load Power Consumption: 300mW (Max) Polarization: Positive Center Applications: Medical Efficiency: Level V Operating Temperature: 0C ~ 40C Output Connector: Barrel Plug, 2.5mm I.D. x 5.5mm O.D. x 9.5mm Size / Dimension: 5.20" L x 2.28" W x 1.20" H (132.0mm x 58.0mm x 30.5mm) Approvals: CE, cURus, TUV Input Connector: IEC 320-C8 Cord Length: 59" (1.50m) Weight: 0.761 lb (345.18g)	1000 Order	250+: $23.7964
EMMA120250-P5RP -IC-ND	EMMA120250-P5RP -IC	CUI Inc.	View more Series: EMMA 30W Part Status: Active Region Utilized: International Form: Wall Mount Input Type: Multi-Blade (Included) Voltage - Input: 90 ~ 264 VAC Voltage - Output: 12V Current - Output (Max): 2.5A Power (Watts): 30W No Load Power Consumption: 300mW (Max) Polarization: Positive Center Applications: Medical Efficiency: Level V Operating Temperature: 0C ~ 40C Output Connector: Barrel Plug R/A, 2.1mm I.D. x 5.5mm O.D. x 9.5mm Size / Dimension: 4.28" L x 2.44" W x 1.45" H (108.7mm x 62.0mm x 36.7mm) Approvals: CE, cURus, GS Input Connector: Multi-Blade Cord Length: 70.9" (1.80m) Weight: 0.662 lb (300.28g)	1000 Order	250+: $19.0957
EMMA240063-P5RP -IC-ND	EMMA240063-P5RP -IC	CUI Inc.	View more Series: EMMA 15W Part Status: Active Region Utilized: International Form: Wall Mount Input Type: Multi-Blade (Included) Voltage - Input: 90 ~ 264 VAC Voltage - Output: 24V Current - Output (Max): 625mA Power (Watts): 15W No Load Power Consumption: 300mW (Max) Polarization: Positive Center Applications: Medical Efficiency: Level V Operating Temperature: 0C ~ 50C Output Connector: Barrel Plug R/A, 2.1mm I.D. x 5.5mm O.D. x 9.5mm Size / Dimension: 3.17" L x 1.89" W x 1.71" H (80.6mm x 47.9mm x 43.3mm) Approvals: CE, cURus, GS Input Connector: Multi-Blade Cord Length: 70.9" (1.80m) Weight: 0.287 lb (130.18g)	1000 Order	250+: $14.9146
ETMA150200UD-P5 RP-IC-ND	ETMA150200UD-P5 RP-IC	CUI Inc.	View more Series: ETMA 30W Part Status: Active Region Utilized: International Form: Desktop (Class II) Input Type: Cord (Sold Separately) Voltage - Input: 90 ~ 264 VAC Voltage - Output: 15V Current - Output (Max): 2A Power (Watts): 30W No Load Power Consumption: 300mW (Max) Polarization: Positive Center Applications: Medical Efficiency: Level V Operating Temperature: 0C ~ 40C Output Connector: Barrel Plug R/A, 2.1mm I.D. x 5.5mm O.D. x 9.5mm Size / Dimension: 4.33" L x 1.97" W x 1.18" H (110.0mm x 50.0mm x 30.0mm) Approvals: CE, cURus, TUV Input Connector: IEC 320-C8 Cord Length: 70.9" (1.80m) Weight: 0.485 lb (219.99g)	1000 Order	250+: $18.1573
ETMA090300UD-P5 P-IC-ND	ETMA090300UD-P5 P-IC	CUI Inc.	View more Series: ETMA 30W Part Status: Active Region Utilized: International Form: Desktop (Class II) Input Type: Cord (Sold Separately) Voltage - Input: 90 ~ 264 VAC Voltage - Output: 9V Current - Output (Max): 3A Power (Watts): 27W No Load Power Consumption: 300mW (Max) Polarization: Positive Center Applications: Medical Efficiency: Level V Operating Temperature: 0C ~ 40C Output Connector: Barrel Plug, 2.1mm I.D. x 5.5mm O.D. x 9.5mm Size / Dimension: 4.33" L x 1.97" W x 1.18" H (110.0mm x 50.0mm x 30.0mm) Approvals: CE, cURus, TUV Input Connector: IEC 320-C8 Cord Length: 48" (1.22m) Weight: 0.485 lb (219.99g)	1000 Order	250+: $18.1573
EMMA180167-P6P- IC-ND	EMMA180167-P6P- IC	CUI Inc.	View more Series: EMMA 30W Part Status: Active Region Utilized: International Form: Wall Mount Input Type: Multi-Blade (Included) Voltage - Input: 90 ~ 264 VAC Voltage - Output: 18V Current - Output (Max): 1.67A Power (Watts): 30W No Load Power Consumption: 300mW (Max) Polarization: Positive Center Applications: Medical Efficiency: Level V Operating Temperature: 0C ~ 40C Output Connector: Barrel Plug, 2.5mm I.D. x 5.5mm O.D. x 9.5mm Size / Dimension: 4.28" L x 2.44" W x 1.45" H (108.7mm x 62.0mm x 36.7mm) Approvals: CE, cURus, GS Input Connector: Multi-Blade Cord Length: 70.9" (1.80m) Weight: 0.662 lb (300.28g)	1000 Order	250+: $19.0957
ETMA360166UD-P5 RP-IC-ND	ETMA360166UD-P5 RP-IC	CUI Inc.	View more Series: ETMA 60W Part Status: Active Region Utilized: International Form: Desktop (Class II) Input Type: Cord (Sold Separately) Voltage - Input: 90 ~ 264 VAC Voltage - Output: 36V Current - Output (Max): 1.66A Power (Watts): 60W No Load Power Consumption: 300mW (Max) Polarization: Positive Center Applications: Medical Efficiency: Level V Operating Temperature: 0C ~ 40C Output Connector: Barrel Plug R/A, 2.1mm I.D. x 5.5mm O.D. x 9.5mm Size / Dimension: 5.20" L x 2.28" W x 1.20" H (132.0mm x 58.0mm x 30.5mm) Approvals: CE, cURus, TUV Input Connector: IEC 320-C8 Cord Length: 72" (1.83m) Weight: 0.761 lb (345.18g)	1000 Order	250+: $23.7964
DMS050160-Z7N-I C-ND	DMS050160-Z7N-I C	CUI Inc.	View more Part Status: Obsolete Region Utilized: International Form: Wall Mount Input Type: Multi-Blade (Included) Voltage - Input: 90 ~ 264 VAC Voltage - Output: 5V Current - Output (Max): 1.6A Power (Watts): 8W Polarization: Negative Center Applications: ITE (Commercial) Efficiency: 75% Operating Temperature: 0C ~ 40C Output Connector: Barrel Plug, 1.3mm I.D. x 3.5mm O.D. x 8.5mm Size / Dimension: 2.83" L x 1.38" W x 1.81" H (72.0mm x 35.0mm x 46.0mm) Approvals: CE, cULus, TUVgs Input Connector: Multi-Blade Cord Length: 70.9" (1.80m) Weight: 0.287 lb (130.18g)	1000 Order	1+: $0
EMMA050200-P5RP -IC-ND	EMMA050200-P5RP -IC	CUI Inc.	View more Series: EMMA 15W Part Status: Active Region Utilized: International Form: Wall Mount Input Type: Multi-Blade (Included) Voltage - Input: 90 ~ 264 VAC Voltage - Output: 5V Current - Output (Max): 2A Power (Watts): 10W No Load Power Consumption: 300mW (Max) Polarization: Positive Center Applications: Medical Efficiency: Level V Operating Temperature: 0C ~ 50C Output Connector: Barrel Plug R/A, 2.1mm I.D. x 5.5mm O.D. x 9.5mm Size / Dimension: 3.17" L x 1.89" W x 1.71" H (80.6mm x 47.9mm x 43.3mm) Approvals: CE, cURus, GS Input Connector: Multi-Blade Cord Length: 70.9" (1.80m) Weight: 0.287 lb (130.18g)	1000 Order	250+: $14.9146
ETMA090300UD-P6 RP-IC-ND	ETMA090300UD-P6 RP-IC	CUI Inc.	View more Series: ETMA 30W Part Status: Active Region Utilized: International Form: Desktop (Class II) Input Type: Cord (Sold Separately) Voltage - Input: 90 ~ 264 VAC Voltage - Output: 9V Current - Output (Max): 3A Power (Watts): 27W No Load Power Consumption: 300mW (Max) Polarization: Positive Center Applications: Medical Efficiency: Level V Operating Temperature: 0C ~ 40C Output Connector: Barrel Plug R/A, 2.5mm I.D. x 5.5mm O.D. x 9.5mm Size / Dimension: 4.33" L x 1.97" W x 1.18" H (110.0mm x 50.0mm x 30.0mm) Approvals: CE, cURus, TUV Input Connector: IEC 320-C8 Cord Length: 48" (1.22m) Weight: 0.485 lb (219.99g)	1000 Order	250+: $18.1573
ETMA120250UD-P6 P-IC-ND	ETMA120250UD-P6 P-IC	CUI Inc.	View more Series: ETMA 30W Part Status: Active Region Utilized: International Form: Desktop (Class II) Input Type: Cord (Sold Separately) Voltage - Input: 90 ~ 264 VAC Voltage - Output: 12V Current - Output (Max): 2.5A Power (Watts): 30W No Load Power Consumption: 300mW (Max) Polarization: Positive Center Applications: Medical Efficiency: Level V Operating Temperature: 0C ~ 40C Output Connector: Barrel Plug, 2.5mm I.D. x 5.5mm O.D. x 9.5mm Size / Dimension: 4.33" L x 1.97" W x 1.18" H (110.0mm x 50.0mm x 30.0mm) Approvals: CE, cURus, TUV Input Connector: IEC 320-C8 Cord Length: 70.9" (1.80m) Weight: 0.485 lb (219.99g)	1000 Order	250+: $18.1573

1 2 3 4 5 >

Hot Searches: high-speed mode interface ic high-speed interface ic high-speed sensor interface ic high-speed controller ic mode interface ic digital mode interface ic high speed driver ic high-speed filter ic high speed counter ic high speed converter ic high speed optocoupler ic ic high-speed optocoupler high-speed rtc ic high-speed ic receiver high-speed optocoupler ic multi-mode modem ic multi-mode modulator ic multi-mode demodulator ic 150mz high-speed ic processor ultra high speed counter ic

Search Result:high-speed mode interface ic

Related Categories