Current through diode - Allicdata Electronics

Related Categories

< 43 44 45 46 47 >

Allicdata Part#	Mft.Part#	Company	Spec.	QTY.	Pricing(USD)
RS401LDI-ND	RS401L	Diodes Incorporated	View more Packaging: Bulk Part Status: Obsolete Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 50V Current - Average Rectified (Io): 4A Voltage - Forward (Vf) (Max) @ If: 1V @ 3A Current - Reverse Leakage @ Vr: 10A @ 50V Operating Temperature: -55C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, RS-4L Supplier Device Package: RS-4L Base Part Number: RS401	1000 Order	1+: $0
RS404L-FDI-ND	RS404L-F	Diodes Incorporated	View more Packaging: Bulk Part Status: Discontinued at Digi-Key Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 400V Current - Average Rectified (Io): 4A Voltage - Forward (Vf) (Max) @ If: 1V @ 3A Current - Reverse Leakage @ Vr: 10A @ 400V Operating Temperature: -55C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, RS-4L Supplier Device Package: RS-4L Base Part Number: RS404	1000 Order	1+: $0
MB158DI-ND	MB158	Diodes Incorporated	View more Packaging: Bulk Part Status: Obsolete Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 800V Current - Average Rectified (Io): 15A Voltage - Forward (Vf) (Max) @ If: 1.1V @ 7.5A Current - Reverse Leakage @ Vr: 10A @ 800V Operating Temperature: -55C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-Square, MB-W Supplier Device Package: MB-W	1000 Order	1+: $0
GBJ1008-FDI-ND	GBJ1008-F	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 800V Current - Average Rectified (Io): 10A Voltage - Forward (Vf) (Max) @ If: 1.05V @ 5A Current - Reverse Leakage @ Vr: 10A @ 800V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ Base Part Number: GBJ1008	20 Order	--
GBJ1510DI-ND	GBJ1510	Diodes Incorporated	View more Packaging: Tube Part Status: Discontinued at Digi-Key Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 1kV Current - Average Rectified (Io): 15A Voltage - Forward (Vf) (Max) @ If: 1.05V @ 7.5A Current - Reverse Leakage @ Vr: 10A @ 1000V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ Base Part Number: GBJ1510	1000 Order	--
GBJ802DI-ND	GBJ802	Diodes Incorporated	View more Packaging: Tube Part Status: Discontinued at Digi-Key Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 200V Current - Average Rectified (Io): 8A Voltage - Forward (Vf) (Max) @ If: 1V @ 4A Current - Reverse Leakage @ Vr: 5A @ 200V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ	1000 Order	1+: $0
KBJ402GDI-ND	KBJ402G	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 200V Current - Average Rectified (Io): 4A Voltage - Forward (Vf) (Max) @ If: 1V @ 2A Current - Reverse Leakage @ Vr: 5A @ 200V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, KBJ Supplier Device Package: KBJ	51 Order	1+: $0.5733 20+: $0.5112 100+: $0.3985 500+: $0.3292 1000+: $0.2599
GBU1004DI-ND	GBU1004	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 400V Current - Average Rectified (Io): 10A Voltage - Forward (Vf) (Max) @ If: 1V @ 5A Current - Reverse Leakage @ Vr: 5A @ 400V Operating Temperature: -55C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBU Supplier Device Package: GBU Base Part Number: GBU1004	129 Order	1+: $1.1214 20+: $1.0017 100+: $0.781 500+: $0.6452 1000+: $0.5094
GBJ1010-FDI-ND	GBJ1010-F	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 1kV Current - Average Rectified (Io): 10A Voltage - Forward (Vf) (Max) @ If: 1.05V @ 5A Current - Reverse Leakage @ Vr: 10A @ 1000V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ Base Part Number: GBJ1010	47353 Order	1+: $1.0206 15+: $0.9181 105+: $0.7381 510+: $0.6064 1005+: $0.5024
GBJ1006-FDI-ND	GBJ1006-F	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 600V Current - Average Rectified (Io): 10A Voltage - Forward (Vf) (Max) @ If: 1.05V @ 5A Current - Reverse Leakage @ Vr: 10A @ 600V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ Base Part Number: GBJ1006	148 Order	--
KBJ608GDI-ND	KBJ608G	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 800V Current - Average Rectified (Io): 6A Voltage - Forward (Vf) (Max) @ If: 1V @ 3A Current - Reverse Leakage @ Vr: 5A @ 800V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, KBJ Supplier Device Package: KBJ	46 Order	--
GBJ602DI-ND	GBJ602	Diodes Incorporated	View more Packaging: Tube Part Status: Discontinued at Digi-Key Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 200V Current - Average Rectified (Io): 6A Voltage - Forward (Vf) (Max) @ If: 1V @ 3A Current - Reverse Leakage @ Vr: 5A @ 200V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ	1000 Order	1+: $0
PBPC801-ND	PBPC801	Diodes Incorporated	View more Packaging: Bulk Part Status: Obsolete Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 50V Current - Average Rectified (Io): 6A Voltage - Forward (Vf) (Max) @ If: 1.1V @ 4A Current - Reverse Leakage @ Vr: 10A @ 50V Operating Temperature: -65C ~ 125C (TJ) Mounting Type: Through Hole Package / Case: 4-Square, PBPC-8 Supplier Device Package: PBPC-8	1000 Order	1+: $0
GBJ1508-FDI-ND	GBJ1508-F	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 800V Current - Average Rectified (Io): 15A Voltage - Forward (Vf) (Max) @ If: 1.05V @ 7.5A Current - Reverse Leakage @ Vr: 10A @ 800V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ Base Part Number: GBJ1508	41 Order	--
GBJ1004DI-ND	GBJ1004	Diodes Incorporated	View more Packaging: Tube Part Status: Discontinued at Digi-Key Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 400V Current - Average Rectified (Io): 10A Voltage - Forward (Vf) (Max) @ If: 1.05V @ 5A Current - Reverse Leakage @ Vr: 10A @ 400V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ Base Part Number: GBJ1004	1000 Order	1+: $0
PBPC805-ND	PBPC805	Diodes Incorporated	View more Packaging: Bulk Part Status: Obsolete Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 600V Current - Average Rectified (Io): 6A Voltage - Forward (Vf) (Max) @ If: 1.1V @ 4A Current - Reverse Leakage @ Vr: 10A @ 600V Operating Temperature: -65C ~ 125C (TJ) Mounting Type: Through Hole Package / Case: 4-Square, PBPC-8 Supplier Device Package: PBPC-8	1000 Order	1+: $0
RS403LDI-ND	RS403L	Diodes Incorporated	View more Packaging: Bulk Part Status: Obsolete Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 200V Current - Average Rectified (Io): 4A Voltage - Forward (Vf) (Max) @ If: 1V @ 3A Current - Reverse Leakage @ Vr: 10A @ 200V Operating Temperature: -55C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, RS-4L Supplier Device Package: RS-4L Base Part Number: RS403	1000 Order	1+: $0
PBPC606-ND	PBPC606	Diodes Incorporated	View more Packaging: Bulk Part Status: Obsolete Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 800V Current - Average Rectified (Io): 4A Voltage - Forward (Vf) (Max) @ If: 1.1V @ 3A Current - Reverse Leakage @ Vr: 10A @ 800V Operating Temperature: -65C ~ 125C (TJ) Mounting Type: Through Hole Package / Case: 4-Square, PBPC-6 Supplier Device Package: PBPC-6	1000 Order	1+: $0
GBU1008-ND	GBU1008	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 800V Current - Average Rectified (Io): 10A Voltage - Forward (Vf) (Max) @ If: 1V @ 5A Current - Reverse Leakage @ Vr: 5A @ 800V Operating Temperature: -55C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBU Supplier Device Package: GBU	1000 Order	--
W005GDI-ND	W005G	Diodes Incorporated	View more Packaging: Bulk Part Status: Obsolete Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 50V Current - Average Rectified (Io): 1.5A Voltage - Forward (Vf) (Max) @ If: 1V @ 1.5A Current - Reverse Leakage @ Vr: 5A @ 50V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-Circular, WOG Supplier Device Package: WOG Base Part Number: W005	1000 Order	1+: $0
KBP02G-ND	KBP02G	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 200V Current - Average Rectified (Io): 1.5A Voltage - Forward (Vf) (Max) @ If: 1.1V @ 1.5A Current - Reverse Leakage @ Vr: 5A @ 200V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, KBP Supplier Device Package: KBP Base Part Number: KBP02	735 Order	1+: $0.3339 35+: $0.2668 105+: $0.2134 525+: $0.1677 1015+: $0.1296
GBJ2001DI-ND	GBJ2001	Diodes Incorporated	View more Packaging: Tube Part Status: Discontinued at Digi-Key Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 100V Current - Average Rectified (Io): 20A Voltage - Forward (Vf) (Max) @ If: 1.05V @ 10A Current - Reverse Leakage @ Vr: 10A @ 100V Operating Temperature: -55C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ	1000 Order	1+: $0
PBPC804-ND	PBPC804	Diodes Incorporated	View more Packaging: Bulk Part Status: Obsolete Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 400V Current - Average Rectified (Io): 6A Voltage - Forward (Vf) (Max) @ If: 1.1V @ 4A Current - Reverse Leakage @ Vr: 10A @ 400V Operating Temperature: -65C ~ 125C (TJ) Mounting Type: Through Hole Package / Case: 4-Square, PBPC-8 Supplier Device Package: PBPC-8	1000 Order	1+: $0
GBJ2010-FDI-ND	GBJ2010-F	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 1kV Current - Average Rectified (Io): 20A Voltage - Forward (Vf) (Max) @ If: 1.05V @ 10A Current - Reverse Leakage @ Vr: 10A @ 1000V Operating Temperature: -55C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ Base Part Number: GBJ2010	255 Order	1+: $1.4301 15+: $1.2856 105+: $1.0333 510+: $0.8489 1005+: $0.7034
GBU1006DI-ND	GBU1006	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 600V Current - Average Rectified (Io): 10A Voltage - Forward (Vf) (Max) @ If: 1V @ 5A Current - Reverse Leakage @ Vr: 5A @ 600V Operating Temperature: -55C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBU Supplier Device Package: GBU	1000 Order	--
GBJ610-FDI-ND	GBJ610-F	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 1kV Current - Average Rectified (Io): 6A Voltage - Forward (Vf) (Max) @ If: 1V @ 3A Current - Reverse Leakage @ Vr: 5A @ 1000V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ	22 Order	1+: $1.0962 15+: $0.9811 105+: $0.7651 510+: $0.632 1005+: $0.499
RS605-ND	RS605	Diodes Incorporated	View more Packaging: Bulk Part Status: Obsolete Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 600V Current - Average Rectified (Io): 6A Voltage - Forward (Vf) (Max) @ If: 1V @ 3A Current - Reverse Leakage @ Vr: 10A @ 600V Operating Temperature: -55C ~ 125C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, RS-6 Supplier Device Package: RS-6 Base Part Number: RS605	1000 Order	--
GBJ610DI-ND	GBJ610	Diodes Incorporated	View more Packaging: Tube Part Status: Discontinued at Digi-Key Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 1kV Current - Average Rectified (Io): 6A Voltage - Forward (Vf) (Max) @ If: 1V @ 3A Current - Reverse Leakage @ Vr: 5A @ 1000V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ	1000 Order	--
PB62-FDI-ND	PB62-F	Diodes Incorporated	View more Packaging: Bulk Part Status: Discontinued at Digi-Key Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 200V Current - Average Rectified (Io): 6A Voltage - Forward (Vf) (Max) @ If: 1.1V @ 3A Current - Reverse Leakage @ Vr: 10A @ 200V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-Square, PB-6 Supplier Device Package: PB-6 Base Part Number: PB62	1000 Order	1+: $0
GBJ2002DI-ND	GBJ2002	Diodes Incorporated	View more Packaging: Tube Part Status: Discontinued at Digi-Key Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 200V Current - Average Rectified (Io): 20A Voltage - Forward (Vf) (Max) @ If: 1.05V @ 10A Current - Reverse Leakage @ Vr: 10A @ 200V Operating Temperature: -55C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ	1000 Order	1+: $0
PBPC802-ND	PBPC802	Diodes Incorporated	View more Packaging: Bulk Part Status: Obsolete Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 100V Current - Average Rectified (Io): 6A Voltage - Forward (Vf) (Max) @ If: 1.1V @ 4A Current - Reverse Leakage @ Vr: 10A @ 100V Operating Temperature: -65C ~ 125C (TJ) Mounting Type: Through Hole Package / Case: 4-Square, PBPC-8 Supplier Device Package: PBPC-8	1000 Order	1+: $0
KBJ406G-ND	KBJ406G	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 600V Current - Average Rectified (Io): 4A Voltage - Forward (Vf) (Max) @ If: 1V @ 2A Current - Reverse Leakage @ Vr: 5A @ 600V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, KBJ Supplier Device Package: KBJ	368 Order	--
GBJ2504-FDI-ND	GBJ2504-F	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 400V Current - Average Rectified (Io): 25A Voltage - Forward (Vf) (Max) @ If: 1.05V @ 12.5A Current - Reverse Leakage @ Vr: 10A @ 400V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ Base Part Number: GBJ2504	922 Order	1+: $1.2285 15+: $1.1021 105+: $0.8857 510+: $0.7277 1005+: $0.6029
GBU602DI-ND	GBU602	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 200V Current - Average Rectified (Io): 6A Voltage - Forward (Vf) (Max) @ If: 1V @ 3A Current - Reverse Leakage @ Vr: 5A @ 200V Operating Temperature: -55C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBU Supplier Device Package: GBU Base Part Number: GBU602	1000 Order	1+: $0.9576 20+: $0.8587 100+: $0.6694 500+: $0.553 1000+: $0.4366
GBJ808-FDI-ND	GBJ808-F	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 800V Current - Average Rectified (Io): 8A Voltage - Forward (Vf) (Max) @ If: 1V @ 4A Current - Reverse Leakage @ Vr: 5A @ 800V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ	1000 Order	1+: $1.2285 15+: $1.1021 105+: $0.8857 510+: $0.7277 1005+: $0.6029
PBPC1001-ND	PBPC1001	Diodes Incorporated	View more Packaging: Bulk Part Status: Obsolete Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 50V Current - Average Rectified (Io): 8A Voltage - Forward (Vf) (Max) @ If: 1.1V @ 5A Current - Reverse Leakage @ Vr: 10A @ 50V Operating Temperature: -65C ~ 125C (TJ) Mounting Type: Through Hole Package / Case: 4-Square, PBPC-8 Supplier Device Package: PBPC-8	1000 Order	1+: $0
GBJ1506DI-ND	GBJ1506	Diodes Incorporated	View more Packaging: Tube Part Status: Discontinued at Digi-Key Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 600V Current - Average Rectified (Io): 15A Voltage - Forward (Vf) (Max) @ If: 1.05V @ 7.5A Current - Reverse Leakage @ Vr: 10A @ 600V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ Base Part Number: GBJ1506	1000 Order	--
GBJ2006-FDI-ND	GBJ2006-F	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 600V Current - Average Rectified (Io): 20A Voltage - Forward (Vf) (Max) @ If: 1.05V @ 10A Current - Reverse Leakage @ Vr: 10A @ 400V Operating Temperature: -55C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ	1605 Order	--
KBP2005GDI-ND	KBP2005G	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 50V Current - Average Rectified (Io): 2A Voltage - Forward (Vf) (Max) @ If: 1.1V @ 2A Current - Reverse Leakage @ Vr: 5A @ 50V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, KBP Supplier Device Package: KBP Base Part Number: KBP2005	11148 Order	1+: $0.3339 35+: $0.2668 105+: $0.2134 525+: $0.1677 1015+: $0.1296
GBJ1510-FDI-ND	GBJ1510-F	Diodes Incorporated	View more Packaging: Tube Part Status: Active Diode Type: Single Phase Technology: Standard Voltage - Peak Reverse (Max): 1kV Current - Average Rectified (Io): 15A Voltage - Forward (Vf) (Max) @ If: 1.05V @ 7.5A Current - Reverse Leakage @ Vr: 10A @ 1000V Operating Temperature: -65C ~ 150C (TJ) Mounting Type: Through Hole Package / Case: 4-SIP, GBJ Supplier Device Package: GBJ Base Part Number: GBJ1510	1680 Order	1+: $1.3293 15+: $1.1936 105+: $0.9595 510+: $0.7883 1005+: $0.6532

< 43 44 45 46 47 >

Hot Searches: current through diode current flow through a diode diode current diodes current regulation diodes current management laser diode current driver saturation current diode diode saturation current high current diode current limiting diode current regulator diode diode reverse saturation current current limiter diode diode leakage current diode forward current reverse current diode zener diode current diode current direction high current laser diode driver current through a resistor

Search Result:current through diode

Related Categories