Microchip power controller - Allicdata Electronics

Related Categories

< 14 15 16 17 18 >

Allicdata Part#	Mft.Part#	Company	Spec.	QTY.	Pricing(USD)
STK282-270-E-ND	STK282-270-E	ON Semiconductor	View more Series: * Part Status: Obsolete	1000 Order	1+: $0
296-32733-ND	TAS5713PHP	Texas Instruments	View more Packaging: Tray Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 3 (168 Hours) Type: Class D Output Type: 2-Channel (Stereo) Max Output Power x Channels @ Load: 25W x 2 @ 8 Ohm Voltage - Supply: 8 V ~ 26 V Features: Depop, Digital Inputs, IC, IS, Mute, Short-Circuit and Thermal Protection, Volume Control Mounting Type: Surface Mount Operating Temperature: 0C ~ 85C (TA) Supplier Device Package: 48-HTQFP (7x7) Package / Case: 48-TQFP Exposed Pad Base Part Number: TAS5713	305 Order	1+: $3.7926 10+: $3.4039 100+: $2.7887 500+: $2.374 1000+: $2.0021
296-17158-2-ND	TPA2008D2PWPR	Texas Instruments	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 2 (1 Year) Type: Class D Output Type: 2-Channel (Stereo) Max Output Power x Channels @ Load: 3W x 2 @ 3 Ohm Voltage - Supply: 4.5 V ~ 5.5 V Features: Depop, Differential Inputs, Short-Circuit and Thermal Protection, Shutdown, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C (TA) Supplier Device Package: 24-HTSSOP Package / Case: 24-TSSOP (0.173", 4.40mm Width) Exposed Pad Base Part Number: TPA2008	2000 Order	--
LM4811MM/NOPBTR -ND	LM4811MM/NOPB	Texas Instruments	View more Series: Boomer Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Type: Class AB Output Type: Headphones, 2-Channel (Stereo) Max Output Power x Channels @ Load: 105mW x 2 @ 16 Ohm Voltage - Supply: 2 V ~ 5.5 V Features: Depop, Shutdown, Thermal Protection, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C (TA) Supplier Device Package: 10-VSSOP Package / Case: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Base Part Number: LM4811	8000 Order	--
MAX9850ETI+TTR- ND	MAX9850ETI+T	Maxim Integrated	View more Series: DirectDrive Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Type: Class AB Output Type: Headphones, 2-Channel (Stereo) Max Output Power x Channels @ Load: 95mW x 2 @ 16 Ohm Voltage - Supply: 1.8 V ~ 3.6 V Features: DAC, Depop, Digital Inputs, IC, IS, Line Level Inputs and Outputs, Mute, Shutdown, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C (TA) Supplier Device Package: 28-TQFN (5x5) Package / Case: 28-WFQFN Exposed Pad Base Part Number: MAX9850	7500 Order	2500+: $1.3595
296-28257-2-ND	TAS5727PHPR	Texas Instruments	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 3 (168 Hours) Type: Class D Output Type: 2-Channel (Stereo) Max Output Power x Channels @ Load: 41.5W x 2 @ 4 Ohm Voltage - Supply: 8 V ~ 26 V Features: Depop, Digital Inputs, IC, IS, Mute, Short-Circuit and Thermal Protection, Shutdown, Volume Control Mounting Type: Surface Mount Operating Temperature: 0C ~ 85C (TA) Supplier Device Package: 48-HTQFP (7x7) Package / Case: 48-TQFP Exposed Pad Base Part Number: TAS5727	1000 Order	--
LM4875M/NOPB-ND	LM4875M/NOPB	Texas Instruments	View more Series: Boomer Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Type: Class AB Output Type: 1-Channel (Mono) with Mono Headphones Max Output Power x Channels @ Load: 1W x 1 @ 8 Ohm; 110mW x 1 @ 32 Ohm Voltage - Supply: 2.7 V ~ 5.5 V Features: Depop, Mute, Shutdown, Thermal Protection, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C (TA) Supplier Device Package: 8-SOIC Package / Case: 8-SOIC (0.154", 3.90mm Width) Base Part Number: LM4875	1486 Order	1+: $1.3986 10+: $1.2537 100+: $1.0078 500+: $0.828 1000+: $0.686
296-35780-2-ND	TAS2505IRGET	Texas Instruments	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 2 (1 Year) Type: Class D Output Type: 1-Channel (Mono) with Mono Headphones Max Output Power x Channels @ Load: 2W x 1 @ 4 Ohm Voltage - Supply: 1.5 V ~ 1.95 V Features: IC, Shutdown, Thermal Protection, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C (TA) Supplier Device Package: 24-VQFN (4x4) Package / Case: 24-VFQFN Exposed Pad Base Part Number: TAS2505	1750 Order	250+: $0.9059 500+: $0.7927 1250+: $0.6568
296-35564-2-ND	LM49350RL/NOPB	Texas Instruments	View more Series: Boomer Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Type: Class D Output Type: 1-Channel (Mono) with Mono and Stereo Headphones Max Output Power x Channels @ Load: 2W x 1 @ 4 Ohm; 69mW x 2 @ 32 Ohm Voltage - Supply: 2.7 V ~ 5.5 V Features: 3D, DAC, Depop, IC, IS, Mute, Short-Circuit and Thermal Protection, Shutdown, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C (TA) Supplier Device Package: 36-DSBGA (3.5x3.24) Package / Case: 36-WFBGA, DSBGA Base Part Number: LM49350	500 Order	--
LM48100QMH/NOPB -ND	LM48100QMH/NOPB	Texas Instruments	View more Series: Boomer, PowerWise Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Type: Class AB Output Type: 1-Channel (Mono) Max Output Power x Channels @ Load: 1.6W x 1 @ 8 Ohm Voltage - Supply: 3 V ~ 5.5 V Features: Depop, IC, Input Multiplexer, Short-Circuit and Thermal Protection, Shutdown, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 105C (TA) Supplier Device Package: 14-HTSSOP Package / Case: 14-TSSOP (0.173", 4.40mm Width) Exposed Pad Base Part Number: LM48100	443 Order	1+: $2.0916 10+: $1.8755 100+: $1.5369 500+: $1.3083 1000+: $1.1034
MAX9850ETI+-ND	MAX9850ETI+	Maxim Integrated	View more Series: DirectDrive Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Type: Class AB Output Type: Headphones, 2-Channel (Stereo) Max Output Power x Channels @ Load: 95mW x 2 @ 16 Ohm Voltage - Supply: 1.8 V ~ 3.6 V Features: DAC, Depop, Digital Inputs, IC, IS, Line Level Inputs and Outputs, Mute, Shutdown, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C (TA) Supplier Device Package: 28-TQFN (5x5) Package / Case: 28-WFQFN Exposed Pad Base Part Number: MAX9850	950 Order	1+: $3.1185 10+: $2.9629 25+: $2.079 50+: $1.9751 100+: $1.5057 250+: $1.4304 500+: $1.3466
LM49450SQ/NOPBT R-ND	LM49450SQ/NOPB	Texas Instruments	View more Series: Boomer Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Type: Class D Output Type: 2-Channel (Stereo) with Stereo Headphones Max Output Power x Channels @ Load: 2.5W x 2 @ 4 Ohm Voltage - Supply: 2.7 V ~ 5.5 V Features: 3D, DAC, Depop, IC, IS, Mute, Short-Circuit and Thermal Protection, Shutdown, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C (TA) Supplier Device Package: 32-WQFN (5x5) Package / Case: 32-WFQFN Exposed Pad Base Part Number: LM49450	1000 Order	--
MAX9768BETG+TTR -ND	MAX9768BETG+T	Maxim Integrated	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Type: Class D Output Type: 1-Channel (Mono) Max Output Power x Channels @ Load: 10W x 1 @ 8 Ohm Voltage - Supply: 4.5 V ~ 14 V Features: Depop, IC, Mute, Short-Circuit and Thermal Protection, Shutdown, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C (TA) Supplier Device Package: 24-TQFN (4x4) Package / Case: 24-WFQFN Exposed Pad Base Part Number: MAX9768	7500 Order	--
296-25564-2-ND	TAS5711PHPR	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Class D Output Type: 2-Channel (Stereo, 2.1) or 4-Channel (Quad) Max Output Power x Channels @ Load: 21W x 2 @ 8 Ohm Voltage - Supply: 8 V ~ 26 V Features: Depop, Digital Inputs, IC, IS, Mute, Short-Circuit and Thermal Protection, Shutdown, Volume Control Mounting Type: Surface Mount Operating Temperature: 0C ~ 85C (TA) Supplier Device Package: 48-HTQFP (7x7) Package / Case: 48-TQFP Exposed Pad Base Part Number: TAS5711	640 Order	--
LM48100QMHE/NOP BTR-ND	LM48100QMHE/NOP B	Texas Instruments	View more Series: Boomer, PowerWise Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Type: Class AB Output Type: 1-Channel (Mono) Max Output Power x Channels @ Load: 1.6W x 1 @ 8 Ohm Voltage - Supply: 3 V ~ 5.5 V Features: Depop, IC, Input Multiplexer, Short-Circuit and Thermal Protection, Shutdown, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 105C (TA) Supplier Device Package: 14-HTSSOP Package / Case: 14-TSSOP (0.173", 4.40mm Width) Exposed Pad Base Part Number: LM48100	1250 Order	250+: $1.3974 500+: $1.2539 1250+: $1.0575
296-27753-2-ND	TAS5715PHPR	Texas Instruments	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 3 (168 Hours) Type: Class D Output Type: 2-Channel (Stereo) Max Output Power x Channels @ Load: 41.5W x 2 @ 4 Ohm Voltage - Supply: 8 V ~ 26 V Features: Depop, IC, Short-Circuit and Thermal Protection, Shutdown, Volume Control Mounting Type: Surface Mount Operating Temperature: 0C ~ 85C (TA) Supplier Device Package: 48-HTQFP (7x7) Package / Case: 48-TQFP Exposed Pad Base Part Number: TAS5715	1000 Order	1+: $27.91
296-41438-2-ND	LM49352RL/NOPB	Texas Instruments	View more Series: Boomer, PowerWise Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Type: Class D Output Type: 1-Channel (Mono) with Mono and Stereo Headphones Max Output Power x Channels @ Load: 1.4W x 1 @ 8 Ohm; 65mW x 2 @ 32 Ohm Features: Depop, Differential Inputs, IC, IS, Microphone, Shutdown, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C (TA) Supplier Device Package: 36-DSBGA (3.5x3.24) Package / Case: 36-WFBGA, DSBGA Base Part Number: LM49352	250 Order	--
296-40563-2-ND	TAS5731MPHPR	Texas Instruments	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 3 (168 Hours) Type: Class D Output Type: 1-Channel (Mono) or 2-Channel (Stereo) Max Output Power x Channels @ Load: 69.6W x 1 @ 4 Ohm, 37.2W x 2 @ 8 Ohm Voltage - Supply: 3 V ~ 3.6 V Features: Depop, Digital Inputs, IC, IS, Mute, Short-Circuit and Thermal Protection, Volume Control Mounting Type: Surface Mount Operating Temperature: 0C ~ 85C (TA) Supplier Device Package: 48-HTQFP (7x7) Package / Case: 48-TQFP Exposed Pad Base Part Number: TAS5731	2000 Order	--
568-7564-ND	TFA9879HN/N1,15 7	NXP USA Inc	View more Packaging: Tray Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Type: Class D Output Type: 1-Channel (Mono) Max Output Power x Channels @ Load: 2.75W x 1 @ 4 Ohm Voltage - Supply: 2.5 V ~ 5.5 V Features: Depop, Digital Inputs, IC, IS, Mute, Short-Circuit and Thermal Protection, Tone and Volume Control Mounting Type: Surface Mount Operating Temperature: -20C ~ 85C (TA) Supplier Device Package: 24-HVQFN (4x4) Package / Case: 24-VFQFN Exposed Pad Base Part Number: TFA9879	5081 Order	1+: $1.4931 10+: $1.3388 100+: $1.0759 500+: $0.8839 1000+: $0.7324
296-32452-2-ND	TPA2016D2RTJT	Texas Instruments	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 2 (1 Year) Type: Class D Output Type: 2-Channel (Stereo) Max Output Power x Channels @ Load: 2.8W x 2 @ 4 Ohm Voltage - Supply: 2.5 V ~ 5.5 V Features: Differential Inputs, IC, Short-Circuit and Thermal Protection, Shutdown, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C (TA) Supplier Device Package: 20-QFN (4x4) Package / Case: 20-WFQFN Exposed Pad Base Part Number: TPA2016	750 Order	250+: $1.5338 500+: $1.3763 1250+: $1.1607
296-14201-2-ND	TPA3002D2PHPR	Texas Instruments	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 4 (72 Hours) Type: Class D Output Type: 2-Channel (Stereo) Max Output Power x Channels @ Load: 9W x 2 @ 8 Ohm Voltage - Supply: 8.5 V ~ 14 V Features: Depop, Differential Inputs, Short-Circuit and Thermal Protection, Shutdown, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C (TA) Supplier Device Package: 48-HTQFP (7x7) Package / Case: 48-TQFP Exposed Pad Base Part Number: TPA3002	5000 Order	--
SSM2518CPZ-ND	SSM2518CPZ	Analog Devices Inc.	View more Packaging: Tray Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 3 (168 Hours) Type: Class D Output Type: 2-Channel (Stereo) Max Output Power x Channels @ Load: 2.5W x 2 @ 4 Ohm Voltage - Supply: 2.5 V ~ 5.5 V Features: Depop, Digital Inputs, IC, IS, Mute, Short-Circuit and Thermal Protection, Shutdown, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C (TA) Supplier Device Package: 20-LFCSP-WQ (4x4) Package / Case: 20-WFQFN Exposed Pad, CSP Base Part Number: SSM2518	1463 Order	--
TFA9879HN/N1,11 8-ND	TFA9879HN/N1,11 8	NXP USA Inc	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Type: Class D Output Type: 1-Channel (Mono) Max Output Power x Channels @ Load: 2.75W x 1 @ 4 Ohm Voltage - Supply: 2.5 V ~ 5.5 V Features: Depop, Digital Inputs, IC, IS, Mute, Short-Circuit and Thermal Protection, Tone and Volume Control Mounting Type: Surface Mount Operating Temperature: -20C ~ 85C (TA) Supplier Device Package: 24-HVQFN (4x4) Package / Case: 24-VFQFN Exposed Pad Base Part Number: TFA9879	1000 Order	6000+: $0.6284
568-13776-2-ND	TDA8551T/N1,118	NXP USA Inc	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Type: Class AB Output Type: 1-Channel (Mono) Max Output Power x Channels @ Load: 1.4W x 1 @ 8 Ohm Voltage - Supply: 2.7 V ~ 5.5 V Features: Depop, Mute, Short-Circuit and Thermal Protection, Standby, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C (TA) Supplier Device Package: 8-SO Package / Case: 8-SOIC (0.154", 3.90mm Width) Base Part Number: TDA8551	1000 Order	2500+: $0.3484 5000+: $0.331
LM4865MX/NOPBTR -ND	LM4865MX/NOPB	Texas Instruments	View more Series: Boomer Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Type: Class AB Output Type: 1-Channel (Mono) with Mono Headphones Max Output Power x Channels @ Load: 1W x 1 @ 8 Ohm; 110mW x 1 @ 32 Ohm Voltage - Supply: 2.7 V ~ 5.5 V Features: Depop, Mute, Shutdown, Thermal Protection, Volume Control Mounting Type: Surface Mount Operating Temperature: -40C ~ 85C (TA) Supplier Device Package: 8-SOIC Package / Case: 8-SOIC (0.154", 3.90mm Width) Base Part Number: LM4865	5000 Order	--
TDA75610EP-HLX- ND	TDA75610EP-HLX	STMicroelectronics	View more Part Status: Active	1000 Order	357+: $3.213
IRS2092C-ND	IRS2092C	Infineon Technologies	View more Part Status: Obsolete Type: Class D Output Type: 2-Channel (Stereo) Voltage - Supply: 3.3V, 5V	1000 Order	1+: $0
PAM8002BSC-ND	PAM8002BSC	Diodes Incorporated	View more Part Status: Obsolete	1000 Order	--
TFA9874DUK/N1Z- ND	TFA9874DUK/N1Z	NXP USA Inc	View more Part Status: Active	1000 Order	2000+: $0.6124
CS35L34-CWZR-ND	CS35L34-CWZR	Cirrus Logic Inc.	View more Part Status: Active	1000 Order	--
TFA9874AUK/N1Z- ND	TFA9874AUK/N1Z	NXP USA Inc	View more Part Status: Active	1000 Order	2000+: $0.6124
AAP803A3-ND	AAP803A3	Microsemi Corporation	View more Part Status: Active	1000 Order	10000+: $0.3334
IRS2092CD-ND	IRS2092CD	Infineon Technologies	View more Part Status: Obsolete Type: Class D Output Type: 2-Channel (Stereo) Voltage - Supply: 3.3V, 5V	1000 Order	1+: $0
PAM8002AZN-ND	PAM8002AZN	Diodes Incorporated	View more Part Status: Obsolete	1000 Order	--
LX1704CLQ-TR-ND	LX1704CLQ-TR	Microsemi Corporation	View more Packaging: Tape & Reel (TR) Part Status: Last Time Buy	1000 Order	1+: $0
TAS2552YFFT-ND	TAS2552YFFT	Texas Instruments	View more Part Status: Active Type: Class D, Class G Output Type: 1-Channel (Mono) Max Output Power x Channels @ Load: 4W x 1 @ 8 Ohm Features: Short-Circuit and Thermal Protection Operating Temperature: -40C ~ 85C (TA)	1000 Order	500+: $0.882
AAT5101IUR-T1-N D	AAT5101IUR-T1	Skyworks Solutions Inc.	View more Part Status: Obsolete Type: Class D Output Type: 1-Channel (Mono) Max Output Power x Channels @ Load: 2.5W x 1 @ 4 Ohm Voltage - Supply: 2.1 V ~ 5.5 V Features: Depop, Short-Circuit and Thermal Protection Operating Temperature: -40C ~ 85C (TA)	1000 Order	--
TAS5780MDCAR-ND	TAS5780MDCAR	Texas Instruments	View more Part Status: Active Type: Class D Output Type: 2-Channel (Stereo) Max Output Power x Channels @ Load: 40W x 2 @ 4 Ohm Voltage - Supply: 4.5 V ~ 26.4 V Features: Short Circuit Protection Operating Temperature: -25C ~ 85C	1000 Order	2000+: $2.0277
STPA002OD-4WX-N D	STPA002OD-4WX	STMicroelectronics	View more Part Status: Active Type: Class AB Output Type: 4-Channel (Quad) Max Output Power x Channels @ Load: 85W x 4 @ 2 Ohm Voltage - Supply: 6 V ~ 18 V Features: Mute, Standby	1000 Order	357+: $4.7124
FDA2100BLV-ND	FDA2100BLV	STMicroelectronics	View more Series: Automotive, AEC-Q100 Part Status: Active Type: Class D Output Type: 2-Channel (Stereo) Max Output Power x Channels @ Load: 120W x 2 @ 4 Ohm Voltage - Supply: 6 V ~ 35 V	1000 Order	960+: $5.9195

< 14 15 16 17 18 >

Hot Searches: microchip power controller microchip power monitor power power controller microchip poe controller microchip interface controllers microchip controllers ic microchip power management power controller pmic abb power controller ablic power controller allegro power controller alpha power controller omega power controller analog power controller bel power controller dialog power controller diodes power controller infineon power controller intel power controller lattice power controller

Search Result:microchip power controller

Related Categories