Cmos quad precision amplifier - Allicdata Electronics

Related Categories

< 2 3 4 5 6

Allicdata Part#	Mft.Part#	Company	Spec.	QTY.	Pricing(USD)
MAX4565EPP-ND	MAX4565EPP	Maxim Integrated	View more Packaging: Tube Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Video Multiplexer/Demultiplexer Circuit: 1:1 Switch Circuit: SPST Number of Channels: 4 On-State Resistance (Max): 60 Ohm Voltage - Supply, Single (V+): 2.7 V ~ 12 V Voltage - Supply, Dual (V): 2.7 V ~ 6 V -3db Bandwidth: 350MHz Features: Bi-Directional, T-Switch Configuration Operating Temperature: -40C ~ 85C (TA) Package / Case: 20-DIP (0.300", 7.62mm) Supplier Device Package: 20-PDIP Base Part Number: MAX4565	1000 Order	1+: $0
PI5L100LE-ND	PI5L100LE	Diodes Incorporated	View more Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Obsolete Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Telecommunications Multiplexer/Demultiplexer Circuit: 2:1 Number of Channels: 4 On-State Resistance (Max): 11.2 Ohm Voltage - Supply, Single (V+): 6.2V -3db Bandwidth: 216MHz Features: 10/100 Base-T, LAN Operating Temperature: 0C ~ 70C (TA) Package / Case: 20-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 20-TSSOP Base Part Number: PI5L100	1000 Order	1+: $0
DG541DJ-ND	DG541DJ	Vishay Siliconix	View more Packaging: Tube Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Part Status: Obsolete Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Video Multiplexer/Demultiplexer Circuit: 1:1 Switch Circuit: SPST Number of Channels: 4 On-State Resistance (Max): 60 Ohm Voltage - Supply, Single (V+): 3 V ~ 15 V Voltage - Supply, Dual (V): 3 V ~ 15 V -3db Bandwidth: 500MHz Features: RGB, T-Switch Configuration Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-DIP (0.300", 7.62mm) Supplier Device Package: 16-PDIP	1000 Order	--
TS3V330D-ND	TS3V330D	Texas Instruments	View more Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Video Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 10 Ohm Voltage - Supply, Single (V+): 3 V ~ 3.6 V -3db Bandwidth: 300MHz Features: RGB Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-SOIC (0.154", 3.90mm Width) Base Part Number: TS3V330	1000 Order	680+: $0.4465
PI5L100Q-ND	PI5L100Q	Diodes Incorporated	View more Packaging: Tube Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Part Status: Obsolete Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Telecommunications Multiplexer/Demultiplexer Circuit: 2:1 Number of Channels: 4 On-State Resistance (Max): 11.2 Ohm Voltage - Supply, Single (V+): 6.2V -3db Bandwidth: 216MHz Features: 10/100 Base-T, LAN Operating Temperature: 0C ~ 70C (TA) Package / Case: 16-SSOP (0.154", 3.90mm Width) Supplier Device Package: 16-QSOP Base Part Number: PI5L100	1000 Order	--
DG542DY-E3-ND	DG542DY-E3	Vishay Siliconix	View more Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Obsolete Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Video Multiplexer/Demultiplexer Circuit: 1:1 Switch Circuit: SPST Number of Channels: 4 On-State Resistance (Max): 60 Ohm Voltage - Supply, Single (V+): 3 V ~ 15 V Voltage - Supply, Dual (V): 3 V ~ 15 V -3db Bandwidth: 500MHz Features: RGB, T-Switch Configuration Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-SOIC (0.154", 3.90mm Width) Supplier Device Package: 16-SOIC Base Part Number: DG542	1000 Order	1+: $0
MAX4888BGTI+T-N D	MAX4888BGTI+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) Applications: PCIe Switch Circuit: DPDT Number of Channels: 2 On-State Resistance (Max): 8.4 Ohm Voltage - Supply, Single (V+): 3 V ~ 3.6 V -3db Bandwidth: 8GHz Operating Temperature: -40C ~ 85C (TA) Package / Case: 28-WFQFN Exposed Pad Supplier Device Package: 28-TQFN (3.5x5.5) Base Part Number: MAX4888	1000 Order	1+: $0
PI2PCIE412-DZHE -ND	PI2PCIE412-DZHE	Diodes Incorporated	View more Packaging: Tray Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Obsolete Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: PCIe Multiplexer/Demultiplexer Circuit: 2:1 Number of Channels: 4 Voltage - Supply, Single (V+): 1.5 V ~ 2 V -3db Bandwidth: 1.4GHz Operating Temperature: -40C ~ 85C (TA) Package / Case: 42-VFQFN Exposed Pad Supplier Device Package: 42-TQFN (9x3.5) Base Part Number: PI2PCIE412	1000 Order	--
296-34692-5-ND	TS3V340PW	Texas Instruments	View more Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Video Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 6 Ohm Voltage - Supply, Single (V+): 3 V ~ 3.6 V -3db Bandwidth: 500MHz Features: RGB Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-TSSOP Base Part Number: TS3V340	210 Order	1+: $0.9324 10+: $0.8329 100+: $0.6492 500+: $0.5363 1000+: $0.4234
TS3V340PWE4-ND	TS3V340PWE4	Texas Instruments	View more Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Video Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 6 Ohm Voltage - Supply, Single (V+): 3 V ~ 3.6 V -3db Bandwidth: 500MHz Features: RGB Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-TSSOP Base Part Number: TS3V340	1000 Order	630+: $0.5363
TS5L100PWG4-ND	TS5L100PWG4	Texas Instruments	View more Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Networking Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 19 Ohm Voltage - Supply, Single (V+): 6 V ~ 6.5 V -3db Bandwidth: 350MHz Features: 10/100 Base-T Operating Temperature: 0C ~ 70C (TA) Package / Case: 20-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 20-TSSOP Base Part Number: TS5L100	1000 Order	350+: $1.0962
FSAV332MTCX-ND	FSAV332MTCX	ON Semiconductor	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Obsolete Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Video Multiplexer/Demultiplexer Circuit: 2:1 Number of Channels: 4 On-State Resistance (Max): 10 Ohm Voltage - Supply, Single (V+): 4.75 V ~ 5.25 V -3db Bandwidth: 368MHz Operating Temperature: -40C ~ 85C (TA) Package / Case: 14-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 14-TSSOP Base Part Number: FSAV332	1000 Order	1+: $0
MAX4927ETN+-ND	MAX4927ETN+	Maxim Integrated	View more Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 3 (168 Hours) Applications: Networking Switch Circuit: DPDT Number of Channels: 4 On-State Resistance (Max): 5.5 Ohm Voltage - Supply, Single (V+): 3 V ~ 3.6 V -3db Bandwidth: 650MHz Features: 1000 Base-T, Bi-Directional, Differential Switching, LAN Operating Temperature: -40C ~ 85C (TA) Package / Case: 56-WFQFN Exposed Pad Supplier Device Package: 56-TQFN-EP (5x11) Base Part Number: MAX4927	1000 Order	--
FSAV430MTCXTR-N D	FSAV430MTCX	ON Semiconductor	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Video Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 6 Ohm Voltage - Supply, Single (V+): 3 V ~ 3.6 V -3db Bandwidth: 1.1GHz Features: Bi-Directional, RGB Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-TSSOP Base Part Number: FSAV430	1000 Order	--
FSAV430BQXTR-ND	FSAV430BQX	ON Semiconductor	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Obsolete Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Video Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 6 Ohm Voltage - Supply, Single (V+): 3 V ~ 3.6 V -3db Bandwidth: 1.1GHz Features: Bi-Directional, RGB Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-WFQFN Exposed Pad Supplier Device Package: 16-DQFN (2.5x3.5) Base Part Number: FSAV430	1000 Order	1+: $0
296-19015-2-ND	TS3L110PWR	Texas Instruments	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Networking Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 8 Ohm Voltage - Supply, Single (V+): 3 V ~ 3.6 V -3db Bandwidth: 500MHz Features: 10/100 Base-T Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-TSSOP Base Part Number: TS3L110	4000 Order	--
296-18212-2-ND	TS3V330PWR	Texas Instruments	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Video Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 10 Ohm Voltage - Supply, Single (V+): 3 V ~ 3.6 V -3db Bandwidth: 300MHz Features: RGB Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-TSSOP Base Part Number: TS3V330	1000 Order	--
296-17040-2-ND	TS5L100DBQR	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) Applications: Networking Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 19 Ohm Voltage - Supply, Single (V+): 6 V ~ 6.5 V -3db Bandwidth: 350MHz Features: 10/100 Base-T Operating Temperature: 0C ~ 70C (TA) Package / Case: 16-SSOP (0.154", 3.90mm Width) Supplier Device Package: 16-SSOP Base Part Number: TS5L100	1000 Order	--
MAX4740ETE+-ND	MAX4740ETE+	Maxim Integrated	View more Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Audio Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 900 mOhm Voltage - Supply, Single (V+): 1.6 V ~ 5.5 V Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-WFQFN Exposed Pad Supplier Device Package: 16-TQFN-EP (3x3) Base Part Number: MAX4740	620 Order	1+: $1.1277 10+: $1.0716 25+: $0.9954 50+: $0.9793
296-17090-2-ND	TS5V330RGYR	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) Applications: Video Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 10 Ohm Voltage - Supply, Single (V+): 4 V ~ 5.5 V -3db Bandwidth: 300MHz (Min) Features: Bi-Directional, RGB Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-VFQFN Exposed Pad Supplier Device Package: 16-VQFN (4x4) Base Part Number: TS5V330	1000 Order	--
MAX4910ETE+TTR- ND	MAX4910ETE+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) Applications: Audio Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 750 mOhm Voltage - Supply, Single (V+): 1.8 V ~ 5.5 V Features: Break-Before-Make, Clickless Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-WFQFN Exposed Pad Supplier Device Package: 16-TQFN-EP (3x3) Base Part Number: MAX4910	1000 Order	2500+: $1.5097
DG541DY-T1-ND	DG541DY-T1	Vishay Siliconix	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Part Status: Obsolete Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Video Multiplexer/Demultiplexer Circuit: 1:1 Switch Circuit: SPST Number of Channels: 4 On-State Resistance (Max): 60 Ohm Voltage - Supply, Single (V+): 3 V ~ 15 V Voltage - Supply, Dual (V): 3 V ~ 15 V -3db Bandwidth: 500MHz Features: RGB, T-Switch Configuration Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-SOIC (0.154", 3.90mm Width) Supplier Device Package: 16-SOIC	1000 Order	1+: $0
TS3L110DBQRG4-N D	TS3L110DBQRG4	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) Applications: Networking Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 8 Ohm Voltage - Supply, Single (V+): 3 V ~ 3.6 V -3db Bandwidth: 500MHz Features: 10/100 Base-T Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-SSOP (0.154", 3.90mm Width) Supplier Device Package: 16-SSOP Base Part Number: TS3L110	1000 Order	2500+: $0.329
FSUSB22MTCXFSTR -ND	FSUSB22MTCX	ON Semiconductor	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Not For New Designs Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: USB Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 6.5 Ohm Voltage - Supply, Single (V+): 3 V ~ 3.6 V -3db Bandwidth: 750MHz Features: Bi-Directional, USB 2.0 Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-TSSOP Base Part Number: FSUSB22	2500 Order	--
296-17392-2-ND	TS3L110DBQR	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) Applications: Networking Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 8 Ohm Voltage - Supply, Single (V+): 3 V ~ 3.6 V -3db Bandwidth: 500MHz Features: 10/100 Base-T Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-SSOP (0.154", 3.90mm Width) Supplier Device Package: 16-SSOP Base Part Number: TS3L110	1000 Order	--
ISL54302IRZ-T-N D	ISL54302IRZ-T	Intersil	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Obsolete Moisture Sensitivity Level (MSL): 1 (Unlimited) Multiplexer/Demultiplexer Circuit: 1:1 Switch Circuit: SPST Number of Channels: 4 On-State Resistance (Max): 2 Ohm (Typ) -3db Bandwidth: 60MHz Features: Bi-Directional Operating Temperature: -40C ~ 85C (TA) Package / Case: 20-VFQFN Exposed Pad Supplier Device Package: 20-QFN (4x4) Base Part Number: ISL54302	1000 Order	1+: $0
MAX4888ETI+TG3U -ND	MAX4888ETI+TG3U	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) Applications: PCIe Multiplexer/Demultiplexer Circuit: 2:1 Switch Circuit: SPDT Number of Channels: 4 On-State Resistance (Max): 7 Ohm (Typ) Voltage - Supply, Single (V+): 1.65 V ~ 3.6 V Operating Temperature: -40C ~ 85C (TA) Package / Case: 28-WFQFN Exposed Pad Supplier Device Package: 28-TQFN (3.5x5.5)	1000 Order	1+: $0
MAX311EPE-ND	MAX311EPE	Maxim Integrated	View more Packaging: Tube Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Video Multiplexer/Demultiplexer Circuit: 4:1 Number of Channels: 2 On-State Resistance (Max): 250 Ohm Voltage - Supply, Single (V+): 9 V ~ 36 V Voltage - Supply, Dual (V): 4.5 V ~ 18 V Features: Break-Before-Make Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-DIP (0.300", 7.62mm) Supplier Device Package: 16-PDIP Base Part Number: MAX311	1000 Order	1+: $0
MAX310EPE-ND	MAX310EPE	Maxim Integrated	View more Packaging: Tube Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Video Multiplexer/Demultiplexer Circuit: 8:1 Number of Channels: 1 On-State Resistance (Max): 250 Ohm Voltage - Supply, Single (V+): 9 V ~ 36 V Voltage - Supply, Dual (V): 4.5 V ~ 18 V Features: Break-Before-Make Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-DIP (0.300", 7.62mm) Supplier Device Package: 16-PDIP Base Part Number: MAX310	1000 Order	1+: $0
MAX4539CWP-ND	MAX4539CWP	Maxim Integrated	View more Packaging: Tube Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Audio Multiplexer/Demultiplexer Circuit: 8:1 Number of Channels: 1 On-State Resistance (Max): 75 Ohm Voltage - Supply, Single (V+): 2.7 V ~ 12 V Voltage - Supply, Dual (V): 2.7 V ~ 6 V Features: Break-Before-Make Operating Temperature: 0C ~ 70C (TA) Package / Case: 20-SOIC (0.295", 7.50mm Width) Supplier Device Package: 20-SOIC Base Part Number: MAX4539	1000 Order	1+: $0
MAX4540CPP-ND	MAX4540CPP	Maxim Integrated	View more Packaging: Tube Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Applications: Audio Multiplexer/Demultiplexer Circuit: 4:1 Number of Channels: 2 On-State Resistance (Max): 75 Ohm Voltage - Supply, Single (V+): 2.7 V ~ 12 V Voltage - Supply, Dual (V): 2.7 V ~ 6 V Features: Break-Before-Make Operating Temperature: 0C ~ 70C (TA) Package / Case: 20-DIP (0.300", 7.62mm) Supplier Device Package: 20-PDIP Base Part Number: MAX4540	1000 Order	1+: $0

< 2 3 4 5 6

Hot Searches: cmos quad precision amplifier quad precision operational amplifier quad chopper precision amplifier cmos precision amplifier cmos precision operational amplifier precision amplifier quad operational amplifier low voltage quad amplifier quad audio operational amplifier 2ua quad operational amplifier quad low noise amplifier analog quad operational amplifier quad integrated operational amplifier quad operational amplifier tape quad operational amplifier reel quad operational amplifier 15 mhz linear quad operational amplifier ic precision operational amplifier ic high-precision detection amplifier high precision current amplifier

Search Result:cmos quad precision amplifier

Related Categories