DiodesZetex Power Management ICs| RS

Producten
- Mechanical, Fluid Power & Tools
- Access, Storage & Material Handling
  Access, Storage & Material Handling
  - Ladders & Steps(116)
  - Material Lifting & Loading Equipment(487)
  - Storage & Shelving(1594)
  - Transit & Equipment Cases(523)
  - Trucks, Trolleys & Lifting Tables(298)
- Adhesives, Sealants & Tapes
  Adhesives, Sealants & Tapes
  - Adhesive, Sealant & Tape Dispensers(196)
  - Adhesives & Glues(345)
  - Sealants & Resins(237)
  - Tapes(2048)
- Bearings & Seals
  Bearings & Seals
  - Gaskets, Seals & Packings(6805)
  - Linear Motion(1301)
  - Rotary Bearings & Housing Units(11476)
- Engineering Materials & Industrial Hardware
  Engineering Materials & Industrial Hardware
  - Anti Vibration & Levelling Components(2246)
  - Carbon Fibre & Felt Sheets(8)
  - Castors & Wheels(1613)
  - Ceramic Materials(25)
  - Channel Support Systems(180)
  - Conveyor Components(511)
  - Insulation Materials(103)
  - Knobs, Levers & Handles(1043)
  - Metal Materials(484)
  - Plastic & Rubber Materials(702)
  - Polishing & Finishing(31)
  - Shim Stock(98)
  - Structural Systems(2194)
- Fasteners & Fixings
  Fasteners & Fixings
  - Clips & Springs(1643)
  - Girder Fixings(140)
  - Magnets & Magnetic Strips(420)
  - Nails & Rivets(683)
  - Nuts & Washers(1513)
  - Pins, Keys & Retaining Clips(348)
  - Screws & Bolts(7150)
  - Sheet Metal & Panel Fasteners(204)
  - Spacers & Standoffs(1214)
  - Wall Plugs, Fixings & Anchors(640)
- Hand Tools
  Hand Tools
  - Cable, Connector & Crimping Tools(2269)
  - Clamps & Vices(506)
  - Hammers & Demolition(789)
  - Knives, Scissors & Saws(882)
  - Manual Grease Guns & Accessories(30)
  - Measuring & Marking(1300)
  - Pliers & Cutters(3413)
  - Sanding, Filing & Polishing(1245)
  - Screwdrivers, Hex & Torx Keys(6260)
  - Spanners, Sockets & Wrenches(9836)
  - Specialist Tools(1643)
  - Staplers & Riveters(62)
  - Threading Tools(1344)
  - Tool Kits & Tool Storage(1932)
- Mechanical Power Transmission
  Mechanical Power Transmission
  - Belts & Pulleys(8451)
  - Brakes & Clutches(49)
  - Bushes & Collars(726)
  - Electric Actuators(932)
  - Gears & Racks(1071)
  - Lead Screws, Ball Screws & Ball Splines(124)
  - Power Transmission Couplings(1345)
  - Roller Chains & Accessories(1223)
- Plumbing & Pipeline
  Plumbing & Pipeline
  - Hose Pipe & Fittings(1966)
  - Pipes & Pipe Fittings(1962)
  - Pipework Maintenance & Water Treatment(136)
  - Sinks, Toilets & Showers(21)
  - Valves & Taps(2526)
  - Water Heating & Pumps(391)
- Pneumatics & Hydraulics
  Pneumatics & Hydraulics
  - Automated Air Blowers(23)
  - Compressed Air Piping Systems(227)
  - Hydraulic Cylinders, Pumps & Power Units(173)
  - Hydraulic Fittings & Tubing(3002)
  - Hydraulic Fluids & Filtration(120)
  - Hydraulic Instrumentation & Switches(141)
  - Hydraulic Tools(8)
  - Hydraulic Valves & Manifolds(219)
  - Pneumatic & Hydraulic Pressure Gauges(5313)
  - Pneumatic Air Preparation(3009)
  - Pneumatic Connectors, Fittings & Hose(9408)
  - Pneumatic Counters, Logic Controllers & Timers(80)
  - Pneumatic Cylinders & Actuators(11201)
  - Pneumatic Sensors & Switches(1203)
  - Pneumatic Valves(7645)
  - Vacuum Components(1325)
- Power Tools, Soldering & Welding
  Power Tools, Soldering & Welding
  - Air Tools(442)
  - Drill Bits & Parts(3222)
  - Grounds Maintenance Tools(53)
  - Milling & Lathing(425)
  - Power Tool Accessories(1999)
  - Power Tools(1199)
  - Sanding Belts, Discs & Wheels(1191)
  - Soldering(2662)
  - Welding & Brazing(146)
  - Workshop Tools(738)
- Electrical, Automation & Cables
- Automation & Control Gear
  Automation & Control Gear
  - Automation Signalling(5550)
  - Contactors & Auxiliary Contacts(11184)
  - Electric Motors(11894)
  - Industrial Robots(22)
  - PLCs, HMIs & Industrial Computing(9122)
  - Process Control(6937)
  - Sensors(27305)
  - Solenoids(158)
- Cables & Wires
  Cables & Wires
  - AV Cables(1678)
  - Cable Glands & Fittings(2292)
  - Cable Joints & Cable Sleeving(3133)
  - Cable Management(6102)
  - Cable Ties & Fixings(3119)
  - Computer Cables(1561)
  - Electrical Power & Industrial Cables(14818)
  - Networking & Coaxial Cables(7591)
  - Single Core Cable(5594)
  - Wire to Board Cables & Ribbon Cable(7551)
- Enclosures & Server Racks
  Enclosures & Server Racks
  - 19-Inch Racking(1264)
  - Enclosures(12360)
  - Enclosures & Racking Components(7500)
- Fuses & Circuit Breakers
  Fuses & Circuit Breakers
  - Circuit Breakers(21481)
  - Earth & Lightning Protection(125)
  - Fuse Holders & Accessories(1230)
  - Fuses(7809)
- HVAC, Fans & Thermal Management
  HVAC, Fans & Thermal Management
  - Air Conditioning & Fans(2528)
  - Air Conditioning & Heating Accessories(1609)
  - Electronics Heating & Cooling Components(1799)
  - Fan Accessories(419)
- Lighting
  Lighting
  - Light Bulbs, Lamps & Tubes(1604)
  - Light Fittings, Fixtures & Luminaires(1906)
  - Lighting Components(366)
  - Torches & Inspection Lamps(529)
- Relays & Signal Conditioning
  Relays & Signal Conditioning
  - Relay Accessories(902)
  - Relays(13685)
  - Signal Conditioners & Isolators(694)
- Switches
  Switches
  - Capacitive, Magnetic and Piezo Switches(1021)
  - DIP & Rotary Encoded Switches(1088)
  - Domestic Installation Switches(1175)
  - Foot Switches & Components(231)
  - Joysticks & Components(297)
  - Key Switches & Selector Switches(2168)
  - Keyboard & Keypad Switches(1807)
  - Limit & Position Switches(2698)
  - Micro Switches & Detector Switches(2376)
  - Push Button Switches & Components(13087)
  - Rocker Switches & Components(981)
  - Rope Pull Switches & Components(346)
  - Rotary Switches & Components(3397)
  - Safety Enabling & Control Switches(102)
  - Safety Interlock Switches & Components(2137)
  - Switch Disconnectors & Components(5839)
  - Toggle Switches & Slide Switches(2077)
- Electronic Components, Power & Connectors
- Batteries & Chargers
  Batteries & Chargers
  - Battery & Charger Accessories(580)
  - Battery Chargers & Power Banks(342)
  - Non-Rechargeable Batteries(527)
  - Rechargeable Batteries(578)
- Connectors
  Connectors
  - AV Connectors(2022)
  - Automotive Electrical Connectors(4932)
  - Backplane & Rack Connectors(1333)
  - Circular Connectors(20782)
  - IC Sockets & Adapters(660)
  - Mains & DC Power Connectors(5289)
  - Network & Telecom Connectors(3517)
  - PCB Connectors & Wire Housings(42534)
  - Power Connectors(9809)
  - RF Coaxial Connectors & Adapters(4909)
  - Terminal Blocks(30598)
  - USB, D Sub & Computing Connectors(9276)
  - Wire Terminals & Splices(6573)
- Displays & Optoelectronics
  Displays & Optoelectronics
  - Display Modules(1883)
  - Fibre Optic Components(240)
  - Indicators & Indicator Components(3868)
  - LED Lighting Components(5258)
  - LEDs - Light Emitting Diodes(6227)
  - Laser Modules & Components(262)
  - Optocouplers & Photodetectors(4490)
- ESD Control, Cleanroom & PCB Prototyping
  ESD Control, Cleanroom & PCB Prototyping
  - ESD Control & Clean Room(859)
  - PCB Etching, Preparation & Developing(50)
  - PCB Handling(104)
  - PCB Spacers, Pillars & Supports(799)
  - PCB Tools(118)
  - Prototyping Boards(460)
- Passive Components
  Passive Components
  - Antennas(2029)
  - Capacitors(41224)
  - Crystals, Oscillators & Resonators(3971)
  - EMI Filters & Protection(6825)
  - Fixed Resistors(46414)
  - Inductors(10163)
  - Passive Components Kits(327)
  - Rotary Encoders(370)
  - Sounder, Buzzer & Microphone Components(833)
  - Surge Protection Components(3534)
  - Variable Resistors(4512)
- Power Supplies & Transformers
  Power Supplies & Transformers
  - Power Supplies(8628)
  - Renewable Energy(137)
  - Transformers(3052)
  - Voltage Converters(14668)
- Raspberry Pi, Arduino, ROCK, STEM Education & Development Tools
  Raspberry Pi, Arduino, ROCK, STEM Education & Development Tools
  - Arduino Shop(235)
  - BBC micro:bit Shop(158)
  - Development Tools & Single Board Computers(5583)
  - ROCK SBC Shop(79)
  - Raspberry Pi Shop(380)
  - STEM Education(90)
- Semiconductors
  Semiconductors
  - Amplifiers & Comparators(5376)
  - Audio & Video ICs(119)
  - Chip Programmers & Debuggers(129)
  - Clock, Timing & Frequency ICs(1145)
  - Communication & Wireless Module ICs(1149)
  - Data Converters(1340)
  - Discrete Semiconductors(39861)
  - Interface ICs(3467)
  - Logic ICs(4315)
  - Memory Chips(2721)
  - Power Management ICs(14773)
  - Processors & Microcontrollers(8486)
  - Programmable Logic ICs(183)
  - Sensor ICs(3425)
- PPE, Safety, Test & IT
- Computing & Peripherals
  Computing & Peripherals
  - 3D Printing & Scanning(985)
  - Audio & Video(805)
  - Barcode Scanners & Accessories(164)
  - Car Technology(10)
  - Computer Components & Software(1564)
  - Keyboards & Mice(644)
  - Labelling(2130)
  - Memory & Data Storage(2040)
  - Mobile Computing(172)
  - Networking & WiFi(2922)
  - Phones & Walkie Talkies(121)
  - Photography & Drones(37)
  - Printing & Scanning(266)
  - Remote Controls(163)
- Facilities Cleaning & Maintenance
  Facilities Cleaning & Maintenance
  - Brushes(380)
  - Cleaning Equipment(86)
  - Cleaning Sprays & Fluids(134)
  - Electronics Cleaners & Protective Coatings(192)
  - Floor Cleaning(847)
  - Greases, Oils & Lubricants(600)
  - Paint & Painting Supplies(263)
  - Washroom Equipment & Supplies(475)
  - Waste & Recycling(224)
  - Wipes & Cloths(544)
- Office Supplies
  Office Supplies
  - Desk Organisation(70)
  - Filing(77)
  - Office Equipment(154)
  - Office Furniture(405)
  - Paper & Consumables(658)
  - Posting & Packaging(85)
  - White Boards, Notice Boards & Planners(188)
  - Writing & Drawing Supplies(194)
- Personal Protective Equipment & Workwear
  Personal Protective Equipment & Workwear
  - Arm & Knee Protection(176)
  - Disposable Workwear(506)
  - Ear Protection(309)
  - Eye & Face Protection(1261)
  - Fall Protection(615)
  - Hand Protection(4992)
  - Head Protection(715)
  - Hi Vis Clothing(4450)
  - Respiratory Protection(777)
  - Safety Footwear(12094)
  - Workwear(12751)
- Security & Ironmongery
  Security & Ironmongery
  - CCTV & Security Surveillance(253)
  - Door Control & Seals(445)
  - Key Cabinets & Safes(181)
  - Latches, Hinges & Handles(1019)
  - Locks & Bolts(1193)
  - Security Alarms & Sensors(368)
- Site Safety
  Site Safety
  - Fire Safety(166)
  - First Aid(120)
  - Lockout Tagout(510)
  - Safety Flooring(320)
  - Safety Signs(684)
  - Spillage Control(448)
  - Traffic Management & Crowd Control(1046)
- Test & Measurement
  Test & Measurement
  - Bench Power Supplies & Sources(1800)
  - Data Acquisition & Logging(924)
  - Electrical Test & Measurement(1773)
  - Electronic Component Testing(293)
  - Engineering Test & Measurement(822)
  - Environmental Test & Measurement(937)
  - Lab Equipment(897)
  - Linear Test & Measurement(11)
  - Multimeters & Accessories(1272)
  - Network Test & Measurement(484)
  - Oscilloscopes & Accessories(2407)
  - Pressure Test & Measurement(408)
  - RF Test & Measurement(201)
  - Signal Generators & Analysers(514)
  - Speed Test & Measurement(85)
  - Temperature Test & Measurement(2590)
  - Test Connectors(2711)
  - Test Leads & Test Lead Kits(1573)
  - Weight & Force Test & Measurement(996)
Merken
- Top merken
- Alle merken
Nieuwe producten
Mijn account
Services

€ 0,102 Each (On a Reel of 3000) Voorraad checken Vergelijken	DiodesZetex AP7313-33SRG-7, 1 Linear Voltage, Voltage Regulator 150mA, 3.3 V 3-Pin, SOT-23R Regulator TypeLinear Voltage Maximum Output Current150mA Output Voltage3.3 V Number of Outputs1 Line Regulation0.2 %/V Bekijk vergelijkbare producten in categorie Voltage Regulators	RS-stocknr. 122-0380 Fabrikant DiodesZetex Fabrikantnummer AP7313-33SRG-7
€ 0,115 Each (On a Reel of 3000) Voorraad checken Vergelijken	DiodesZetex AP2202K-ADJTRG1, 1 Low Dropout Voltage, Voltage Regulator 150mA, 2.3 → 13.2 V 5-Pin, SOT-23 Maximum Output Current150mA Regulator TypeLow Dropout Voltage Output Voltage2.3 → 13.2 V Number of Outputs1 Line Regulation0.05 %/V Bekijk vergelijkbare producten in categorie Voltage Regulators	RS-stocknr. 122-3359 Fabrikant DiodesZetex Fabrikantnummer AP2202K-ADJTRG1
€ 0,632 Each (In a Pack of 25) Also available in industry standard packaging Voorraad checken Vergelijken	DiodesZetex ZLDO1117K33TC, 1 Linear Voltage, Voltage Regulator 1A, 3.3 V 3-Pin, TO-252 Maximum Output Current1A Regulator TypeLinear Voltage Number of Outputs1 Output Voltage3.3 V Line Regulation0.2 % Bekijk vergelijkbare producten in categorie Voltage Regulators	RS-stocknr. 751-5192 Fabrikant DiodesZetex Fabrikantnummer ZLDO1117K33TC
€ 0,087 Each (On a Reel of 3000) Voorraad checken Vergelijken	DiodesZetex AP2112K-3.3TRG1, 1 Low Dropout Voltage, Voltage Regulator, 3.3 V 5-Pin, SOT-23 Regulator TypeLow Dropout Voltage Number of Outputs1 Output Voltage3.3 V Line Regulation0.1 %/V Load Regulation1 %/A Bekijk vergelijkbare producten in categorie Voltage Regulators	RS-stocknr. 121-9647 Fabrikant DiodesZetex Fabrikantnummer AP2112K-3.3TRG1
€ 0,188 Each (On a Reel of 3000) Voorraad checken Vergelijken	DiodesZetex AP3019AKTR-G1, 1-Channel, Step Up DC-DC Converter, Adjustable 6-Pin, SOT-23 Maximum Output Voltage38 V Minimum Input Voltage2.5 V Maximum Input Voltage16 V Converter TypeStep Up Number of Outputs1 Bekijk vergelijkbare producten in categorie DC-DC Converters ICs	RS-stocknr. 165-8355 Fabrikant DiodesZetex Fabrikantnummer AP3019AKTR-G1
€ 0,886 Each (In a Pack of 10) Also available in industry standard packaging Voorraad checken Vergelijken	Diodes Inc Fixed Shunt Voltage Reference 2.5V ±1.0 % 3-Pin SOT-23, ZRC250F03TA Nominal Voltage2.5V Package TypeSOT-23 Reference TypeFixed Initial Accuracy±1.0 % Mounting TypeSurface Mount Bekijk vergelijkbare producten in categorie Voltage References	RS-stocknr. 885-5659 Fabrikant DiodesZetex Fabrikantnummer ZRC250F03TA
€ 0,059 Each (In a Pack of 100) Also available in industry standard packaging Voorraad checken Vergelijken	DiodesZetex AP2125N-3.3TRG1, 1 Low Dropout Voltage, Voltage Regulator, 3.3 V 3-Pin, SOT-23 Regulator TypeLow Dropout Voltage Number of Outputs1 Output Voltage3.3 V Line Regulation15 mV Accuracy±2% Bekijk vergelijkbare producten in categorie Voltage Regulators	RS-stocknr. 828-7356 Fabrikant DiodesZetex Fabrikantnummer AP2125N-3.3TRG1
€ 0,649 Each (In a Pack of 25) Also available in industry standard packaging Voorraad checken Vergelijken	DiodesZetex AP3105KTR-G1, PWM Controller, 25 V, 70 kHz 6-Pin, SOT-23 Maximum Switching Frequency70 kHz Output Current350 mA Control MethodCurrent Number of Outputs1 Fall Time100ns Bekijk vergelijkbare producten in categorie PWM	RS-stocknr. 828-7432 Fabrikant DiodesZetex Fabrikantnummer AP3105KTR-G1
€ 0,968 Each (In a Pack of 4) Also available in industry standard packaging Voorraad checken Vergelijken	DiodesZetex AP1501A-K5G-13, 1-Channel, Step Down DC-DC Converter, Adjustable 5-Pin, TO-263 Minimum Output Voltage1.23 V Maximum Output Voltage37 V Minimum Input Voltage4.5 V Maximum Input Voltage40 V Maximum Output Current3A Bekijk vergelijkbare producten in categorie DC-DC Converters ICs	RS-stocknr. 822-8798 Fabrikant DiodesZetex Fabrikantnummer AP1501A-K5G-13
€ 0,305 Each (In a Pack of 50) Also available in industry standard packaging Voorraad checken Vergelijken	DiodesZetex AZ1117H-5.0TRE1, 1 Linear Voltage, Voltage Regulator 1A, 5 V 3+Tab-Pin, SOT-223 Maximum Output Current1A Regulator TypeLinear Voltage Number of Outputs1 Output Voltage5 V Line Regulation10 mV Bekijk vergelijkbare producten in categorie Voltage Regulators	RS-stocknr. 885-5432 Fabrikant DiodesZetex Fabrikantnummer AZ1117H-5.0TRE1
€ 0,392 Each (In a Pack of 30) Also available in industry standard packaging Voorraad checken Vergelijken	DiodesZetex DMN61D8LVT-7, MOSFET 2, 630 mA, 60V 6-Pin, TSOT-26 Output Current630 mA Supply Voltage60V Pin Count6 Fall Time440ns Package TypeTSOT-26 Bekijk vergelijkbare producten in categorie Gate Drivers	RS-stocknr. 921-1293 Fabrikant DiodesZetex Fabrikantnummer DMN61D8LVT-7
€ 0,41 Each (In a Pack of 50) Also available in industry standard packaging Voorraad checken Vergelijken	DiodesZetex AP7313-33SRG-7, 1 Linear Voltage, Voltage Regulator 150mA, 3.3 V 3-Pin, SOT-23R Regulator TypeLinear Voltage Maximum Output Current150mA Number of Outputs1 Output Voltage3.3 V Line Regulation0.2 %/V Bekijk vergelijkbare producten in categorie Voltage Regulators	RS-stocknr. 751-3067 Fabrikant DiodesZetex Fabrikantnummer AP7313-33SRG-7
€ 1,302 Each (In a Pack of 5) Also available in industry standard packaging Voorraad checken Vergelijken	Diodes Inc Fixed Shunt Voltage Reference 3.3V ±1.0 % 3-Pin SOT-23, ZRC330F01TA Nominal Voltage3.3V Package TypeSOT-23 Reference TypeFixed Initial Accuracy±1.0 % Mounting TypeSurface Mount Bekijk vergelijkbare producten in categorie Voltage References	RS-stocknr. 738-5103 Fabrikant DiodesZetex Fabrikantnummer ZRC330F01TA
€ 0,284 Each (On a Reel of 3000) Voorraad checken Vergelijken	DiodesZetex AP2280-1WG-7High Side, High Side Switch Power Switch IC 5-Pin, SOT-25 Power Switch TopologyHigh Side Power Switch TypeHigh Side Switch Switch On Resistance250mΩ Maximum Operating Supply Voltage6 V Number of Outputs1 Bekijk vergelijkbare producten in categorie Power Switch ICs	RS-stocknr. 922-8308 Fabrikant DiodesZetex Fabrikantnummer AP2280-1WG-7
€ 1,107 Each (On a Reel of 2500) Voorraad checken Vergelijken	DiodesZetex AP1609SG-13, Boost Converter, Step Up 2.4A Adjustable, 300 kHz 8-Pin, SOP Regulator FunctionStep Up Maximum Output Current2.4A Number of Outputs1 Maximum Input Voltage6 V Mounting TypeSurface Mount Bekijk vergelijkbare producten in categorie Boost Converters	RS-stocknr. 122-0360 Fabrikant DiodesZetex Fabrikantnummer AP1609SG-13
€ 0,091 Each (On a Reel of 4000) Voorraad checken Vergelijken	DiodesZetex AZ1117H-5.0TRE1, 1 Linear Voltage, Voltage Regulator 1A, 5 V 3+Tab-Pin, SOT-223 Regulator TypeLinear Voltage Maximum Output Current1A Output Voltage5 V Number of Outputs1 Line Regulation10 mV Bekijk vergelijkbare producten in categorie Voltage Regulators	RS-stocknr. 122-3393 Fabrikant DiodesZetex Fabrikantnummer AZ1117H-5.0TRE1
€ 0,457 Each (In a Pack of 30) Also available in industry standard packaging Voorraad checken Vergelijken	DiodesZetex AP3019AKTR-G1, 1-Channel, Step Up DC-DC Converter, Adjustable 6-Pin, SOT-23 Maximum Output Voltage38 V Minimum Input Voltage2.5 V Maximum Input Voltage16 V Converter TypeStep Up Number of Outputs1 Bekijk vergelijkbare producten in categorie DC-DC Converters ICs	RS-stocknr. 921-0509 Fabrikant DiodesZetex Fabrikantnummer AP3019AKTR-G1
€ 0,596 Each (In a Pack of 25) Also available in industry standard packaging Voorraad checken Vergelijken	DiodesZetex AP2280-1WG-7High Side, High Side Switch Power Switch IC 5-Pin, SOT-25 Power Switch TypeHigh Side Switch Power Switch TopologyHigh Side Switch On Resistance250mΩ Maximum Operating Supply Voltage6 V Maximum Operating Current2A Bekijk vergelijkbare producten in categorie Power Switch ICs	RS-stocknr. 751-2982 Fabrikant DiodesZetex Fabrikantnummer AP2280-1WG-7
€ 0,059 Each (In a Pack of 25) Also available in industry standard packaging Voorraad checken Vergelijken	DiodesZetex Voltage Supervisor 3-Pin SOT-23, APX809-29SAG-7 Voltage Supervisor TypeMicroprocessor Reset Monitor Number of Supervisors1 Output DriverActive Low, Push-Pull Maximum Reset Active Time280ms Mounting TypeSurface Mount Bekijk vergelijkbare producten in categorie Voltage Supervisors	RS-stocknr. 712-2778 Fabrikant DiodesZetex Fabrikantnummer APX809-29SAG-7
€ 0,158 Each (On a Reel of 3000) Voorraad checken Vergelijken	DiodesZetex DMN61D8LVT-7, MOSFET 2, 630 mA, 60V 6-Pin, TSOT-26 Output Current630 mA Supply Voltage60V Pin Count6 Fall Time440ns Package TypeTSOT-26 Bekijk vergelijkbare producten in categorie Gate Drivers	RS-stocknr. 165-8368 Fabrikant DiodesZetex Fabrikantnummer DMN61D8LVT-7

Power Management ICs

Categorieën