Non-inverting line driver - Allicdata Electronics

Related Categories

< 17 18 19 20 21 >

Allicdata Part#	Mft.Part#	Company	Spec.	QTY.	Pricing(USD)
71292-002-ND	71292-002	Amphenol FCI	View more Series: 71292 Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Center Strip Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Plug Number of Positions: 40 Number of Rows: 2 Mounting Type: Board Edge, Straddle Mount Termination: Solder Type: SCA-2 Contact Finish: Gold, GXT Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
H11-RDA-110-4-C T-ND	H11-RDA-110-4-C T	Amphenol Commercial Products	View more Part Status: Last Time Buy Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Connector Type: Receptacle Number of Positions: 68 Number of Rows: 2 Mounting Type: Board Edge, Straddle Mount Termination: Solder Flange Feature: Hollow, Unthreaded Type: VHDCI Features: Cover, Shielded Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
WM7354-ND	71430-0101	Molex Connector Corporation	View more Series: Ultra+ VHDCI 71430 Part Status: Active Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 68 Number of Rows: 2 Mounting Type: Through Hole, Right Angle Termination: Solder Flange Feature: Insert, Threaded (M2) Type: SCSI+, VHDCI Features: Board Lock, Shielded Contact Finish: Gold Contact Finish Thickness: Flash	2382 Order	1+: $8.3034 10+: $7.5474 25+: $7.3587 50+: $6.7927 100+: $6.4153 250+: $5.8493 500+: $5.4719 1000+: $5.019
A1550-ND	552116-1	TE Connectivity AMP Connectors	View more Series: CHAMP .085 Part Status: Active Lead Free Status / RoHS Status: Lead free / RoHS non-compliant Connector Style: Center Strip Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Plug Number of Positions: 50 Number of Rows: 2 Mounting Type: Through Hole Termination: Solder Flange Feature: Board Side Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	480+: $3.8773
A1514-ND	552740-1	TE Connectivity AMP Connectors	View more Series: CHAMP .085 Part Status: Obsolete Lead Free Status / RoHS Status: Lead free / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 24 Number of Rows: 2 Mounting Type: Panel Mount, Through Hole, Right Angle Termination: Solder Flange Feature: Insert, Threaded (4-40) Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
3M1725-ND	10250-6212VC	3M	View more Series: 102, Mini D Ribbon (MDR) Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 50 Number of Rows: 2 Mounting Type: Panel Mount, Through Hole Termination: Solder Flange Feature: Insert, Threaded (M2.5); Latchblocks Features: Shielded Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
H10042-ND	DX20M-14S	Hirose Electric Co Ltd	View more Series: DXM Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 14 Number of Rows: 2 Mounting Type: Panel Mount, Through Hole Termination: Solder Flange Feature: Insert, Threaded (M2.6); Latchblocks Type: Miniature High Density (HD) Contact Finish: Gold	1000 Order	1+: $0
72547-002-ND	72547-002	Amphenol FCI	View more Series: 72547 Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Center Strip Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Plug Number of Positions: 20 Number of Rows: 2 Mounting Type: Board Edge, Straddle Mount Termination: Solder Type: SCA-2 Contact Finish: Gold, GXT Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
A26161-ND	557101-5	TE Connectivity AMP Connectors	View more Series: CHAMP .050 I Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 40 Number of Rows: 2 Mounting Type: Through Hole, Right Angle Termination: Solder Type: Board to Board Features: Board Lock Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
79059-2720-ND	79059-2720	Molex, LLC	View more Series: 79059 Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 50 Number of Rows: 2 Mounting Type: Through Hole, Right Angle Termination: Solder Flange Feature: Hollow, Unthreaded; Latchblocks Type: SCSI+ Features: Board Lock, Shielded Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
A24353-ND	552738-1	TE Connectivity AMP Connectors	View more Series: CHAMP .085 Part Status: Active Lead Free Status / RoHS Status: Lead free / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 14 Number of Rows: 2 Mounting Type: Panel Mount, Through Hole, Right Angle Termination: Solder Flange Feature: Insert, Threaded (4-40) Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	630+: $4.5212
71292-103S-ND	71292-103S	Amphenol FCI	View more Series: 71292 Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Center Strip Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Plug Number of Positions: 80 Number of Rows: 2 Mounting Type: Board Edge, Straddle Mount Termination: Solder Type: SCA-2 Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
10250-6202VC-ND	10250-6202VC	3M	View more Series: 102, Mini D Ribbon (MDR) Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 50 Number of Rows: 2 Mounting Type: Panel Mount, Through Hole Termination: Solder Flange Feature: Insert, Threaded (M2.6); Latchblocks Features: Shielded Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
0714309101-ND	0714309101	Molex, LLC	View more Series: Ultra+ VHDCI 71430 Part Status: Active Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 68 Number of Rows: 2 Mounting Type: Through Hole, Right Angle Termination: Solder Flange Feature: Insert, Threaded (M2) Type: VHDCI Features: Board Lock, Shielded Contact Finish: Gold Contact Finish Thickness: Flash	1000 Order	273+: $6.2263
556622-1-ND	556622-1	TE Connectivity AMP Connectors	View more Series: CHAMP .085 Part Status: Active Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 64 Number of Rows: 2 Mounting Type: Through Hole Termination: Press-Fit Flange Feature: Insert, Threaded (4-40) Features: Shielded Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	2940+: $8.3292
A26151-ND	5-175473-1	TE Connectivity AMP Connectors	View more Series: CHAMP .050 I Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Center Strip Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Plug Number of Positions: 20 Number of Rows: 2 Mounting Type: Through Hole Termination: Solder Type: Board to Board Features: Board Lock Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
H11-RDA-101-4-N D	H11-RDA-101-4	Amphenol Commercial Products	View more Part Status: Last Time Buy Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Connector Type: Receptacle Number of Positions: 68 Number of Rows: 2 Mounting Type: Board Edge, Straddle Mount Termination: Solder Flange Feature: Mating Side, Female Screwlock (M2) Type: VHDCI Features: Shielded Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
3M1727-ND	10280-6212VC	3M	View more Series: 102, Mini D Ribbon (MDR) Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 80 Number of Rows: 2 Mounting Type: Panel Mount, Through Hole Termination: Solder Flange Feature: Insert, Threaded (M2.5); Latchblocks Features: Shielded Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
H11-RDA-101-3-C -ND	H11-RDA-101-3-C	Amphenol Commercial Products	View more Part Status: Last Time Buy Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Connector Type: Receptacle Number of Positions: 68 Number of Rows: 2 Mounting Type: Board Edge, Straddle Mount Termination: Solder Flange Feature: Mating Side, Female Screwlock (M2) Type: VHDCI Features: Cover, Shielded Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
552744-7-ND	552744-7	TE Connectivity AMP Connectors	View more Series: CHAMP .085 Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 64 Number of Rows: 2 Mounting Type: Panel Mount, Through Hole, Right Angle Termination: Solder Flange Feature: Insert, Threaded (4-40) Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
A1557-ND	554436-2	TE Connectivity AMP Connectors	View more Series: CHAMP .085 Part Status: Active Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 50 Number of Rows: 2 Mounting Type: Panel Mount Termination: IDC Flange Feature: Board Side (4-40) Features: Shielded Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	500+: $7.2587
84505-2-ND	84505-2	TE Connectivity AMP Connectors	View more Series: CHAMP .050 I Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Center Strip Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Plug Number of Positions: 40 Number of Rows: 2 Mounting Type: Board Edge, Straddle Mount Termination: Solder Type: SCA-2, SCSI Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
HE11-RDA-101-4- CT-ND	HE11-RDA-101-4- CT	Amphenol Commercial Products	View more Part Status: Last Time Buy Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Connector Type: Receptacle Number of Positions: 68 Number of Rows: 2 Mounting Type: Board Edge, Straddle Mount Termination: Solder Flange Feature: Mating Side, Female Screwlock (M2) Type: VHDCI Features: Shielded Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
A1554-ND	552725-1	TE Connectivity AMP Connectors	View more Series: CHAMP .085 Part Status: Obsolete Lead Free Status / RoHS Status: Lead free / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 50 Number of Rows: 2 Mounting Type: Panel Mount, Through Hole, Right Angle Termination: Solder Flange Feature: Tapped, Threaded (4-40) Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
A26160-ND	557100-5	TE Connectivity AMP Connectors	View more Series: CHAMP .050 I Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Center Strip Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Plug Number of Positions: 40 Number of Rows: 2 Mounting Type: Through Hole, Right Angle Termination: Solder Features: Board Lock Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
5-175474-1-ND	5-175474-1	TE Connectivity AMP Connectors	View more Series: CHAMP .050 I Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 20 Number of Rows: 2 Mounting Type: Through Hole, Right Angle Termination: Solder Type: Board to Board Features: Board Lock Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
1658203-1-ND	1658203-1	TE Connectivity AMP Connectors	View more Series: CHAMP .050 I Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 200 Number of Rows: 4 Mounting Type: Through Hole, Right Angle Termination: Solder Flange Feature: Mating Side Features: Board Lock Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
A15022-ND	1-557102-7	TE Connectivity AMP Connectors	View more Series: CHAMP .050 I Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Center Strip Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Plug Number of Positions: 68 Number of Rows: 2 Mounting Type: Through Hole Termination: Solder Features: Board Lock Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
3M1728-ND	102A0-6212VC	3M	View more Series: 102, Mini D Ribbon (MDR) Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 100 Number of Rows: 2 Mounting Type: Panel Mount, Through Hole Termination: Solder Flange Feature: Insert, Threaded (M2.5); Latchblocks Features: Shielded Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
H10025-ND	DX10BM-68S	Hirose Electric Co Ltd	View more Series: DXM Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 68 Number of Rows: 2 Mounting Type: Panel Mount, Through Hole, Right Angle Termination: Solder Flange Feature: Mating Side, Female Screwlock (M2.6) Type: Miniature High Density (HD) Contact Finish: Gold	1000 Order	1+: $0
84488-1-ND	84488-1	TE Connectivity AMP Connectors	View more Series: CHAMP .050 I Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Center Strip Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Plug Number of Positions: 80 Number of Rows: 2 Mounting Type: Through Hole Termination: Solder Type: SCA-2, SCSI Features: Board Guide, Board Lock Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
HE11-RAA-111-1- ND	HE11-RAA-111-1	Amphenol Commercial Products	View more Part Status: Last Time Buy Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Connector Type: Receptacle Number of Positions: 68 Number of Rows: 2 Mounting Type: Panel Mount, Through Hole, Right Angle Termination: Solder Flange Feature: Mating Side, Female Screwlock (M2) Type: VHDCI Features: Board Guide, Shielded Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
787653-1-ND	787653-1	TE Connectivity AMP Connectors	View more Series: CHAMP .050 I Part Status: Active Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 20 Number of Rows: 2 Mounting Type: Through Hole, Right Angle Termination: Solder Type: Board to Board Features: Board Lock, Latch Lock Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	800+: $5.9468
A24230-ND	2-557101-5	TE Connectivity AMP Connectors	View more Series: CHAMP .050 I Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 100 Number of Rows: 2 Mounting Type: Through Hole, Right Angle Termination: Solder Type: Board to Board Features: Board Lock Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
71781-001-ND	71781-001	Amphenol FCI	View more Series: 71781 Part Status: Active Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 40 Number of Rows: 2 Mounting Type: Through Hole Termination: Solder Type: SCA-2 Features: Board Guide, Board Lock, Latch Lock Contact Finish: Gold, GXT Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
A24295-ND	553813-4	TE Connectivity AMP Connectors	View more Series: CHAMP .085 Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 50 Number of Rows: 2 Mounting Type: Panel Mount, Through Hole, Right Angle Termination: Solder Flange Feature: Insert, Threaded (4-40) Features: Shielded Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
A23619-ND	749611-1	TE Connectivity AMP Connectors	View more Series: AMPLIMITE .050 III Part Status: Active Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 26 Number of Rows: 2 Mounting Type: Panel Mount Termination: IDC Flange Feature: Insert, Threaded (2-56); Latchblocks, Rails Type: SCSI Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	896+: $5.3857
0714309005-ND	0714309005	Molex, LLC	View more Series: Ultra+ VHDCI 71430 Part Status: Active Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 68 Number of Rows: 2 Mounting Type: Through Hole, Right Angle Termination: Solder Flange Feature: Insert, Threaded (M2) Type: VHDCI Features: Board Lock, Shielded Contact Finish: Gold Contact Finish Thickness: Flash	1000 Order	273+: $6.2263
A24301-ND	555139-1	TE Connectivity AMP Connectors	View more Series: CHAMP .085 Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 24 Number of Rows: 2 Mounting Type: Through Hole, Right Angle Termination: Solder Flange Feature: Insert, Threaded (6-32) Features: Shielded Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0
5-175474-8-ND	5-175474-8	TE Connectivity AMP Connectors	View more Series: CHAMP .050 I Part Status: Obsolete Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant Connector Style: Outer Shroud Contacts Moisture Sensitivity Level (MSL): 1 (Unlimited) Connector Type: Receptacle Number of Positions: 68 Number of Rows: 2 Mounting Type: Through Hole, Right Angle Termination: Solder Type: Board to Board Features: Board Lock Contact Finish: Gold Contact Finish Thickness: 30.0in (0.76m)	1000 Order	1+: $0

< 17 18 19 20 21 >

Hot Searches: non-inverting line driver non-inverted gate driver non-inverting logic driver logical non-inverting driver non-inverting logic buffer non-inverting logic transceiver logic non-inverting buffer logic non-inverting transceiver non-inverted trigger non-inverting flip-flop non-inverting latch ic non-inverted shift register non-inverted logic converter non-inverting logic converter non-inverting level shifter parallel line display driver logic line driver in-line inverter logic ic inverted gate driver line driver

Search Result:non-inverting line driver

Related Categories