Sensor interface program - Allicdata Electronics

Related Categories

< 13 14 15 16 17 >

Allicdata Part#	Mft.Part#	Company	Spec.	QTY.	Pricing(USD)
S-8229AAB-M6T1U -ND	S-8229AAB-M6T1U	ABLIC U.S.A. 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) Function: Battery Monitor Battery Chemistry: Lithium-Ion Operating Temperature: -40C ~ 85C (TA) Package / Case: SOT-23-6 Supplier Device Package: SOT-23-6	1000 Order	3000+: $0.2734
S-8252AAJ-M6T1U -ND	S-8252AAJ-M6T1U	ABLIC U.S.A. 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) Function: Battery Protection Battery Chemistry: Lithium-Ion/Polymer Number of Cells: 2 Fault Protection: Over Current Operating Temperature: -40C ~ 85C (TA) Package / Case: SOT-23-6 Supplier Device Package: SOT-23-6	1000 Order	3000+: $0.4234
S-8209AAO-T8T1S -ND	S-8209AAO-T8T1S	ABLIC U.S.A. 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) Function: Multi-Function Controller Battery Chemistry: Lithium-Ion/Polymer Operating Temperature: -40C ~ 85C (TA) Package / Case: 8-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 8-TSSOP	1000 Order	3000+: $0.4322
S-8244AACFN-CEC T2G-ND	S-8244AACFN-CEC T2G	ABLIC U.S.A. Inc.	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) Function: Battery Protection Battery Chemistry: Lithium-Ion Number of Cells: 1 ~ 4 Fault Protection: Over Voltage Operating Temperature: -40C ~ 85C (TA) Package / Case: 8-LSSOP, 8-MSOP (0.110", 2.80mm Width) Supplier Device Package: 8-MSOP	1000 Order	3000+: $0.4338
S-8253CAI-T8T1G Z-ND	S-8253CAI-T8T1G Z	ABLIC U.S.A. Inc.	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) Function: Battery Protection Battery Chemistry: Lithium-Ion/Polymer Number of Cells: 2 Fault Protection: Over Current, Short Circuit Operating Temperature: -40C ~ 85C (TA) Package / Case: 8-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 8-TSSOP	1000 Order	3000+: $0.5273
S-8205BAS-TCT1U -ND	S-8205BAS-TCT1U	ABLIC U.S.A. 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) Function: Battery Protection Battery Chemistry: Lithium-Ion Number of Cells: 5 Fault Protection: Over Current, Short Circuit Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-TSSOP	1000 Order	4000+: $0.9636
BQ26221PWG4-ND	BQ26221PWG4	Texas Instruments	View more Packaging: Tube Part Status: Not For New Designs Function: Battery Monitor Battery Chemistry: Lithium-Ion Number of Cells: 1 Interface: HDQ Operating Temperature: -20C ~ 70C (TA) Package / Case: 8-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 8-TSSOP Base Part Number: BQ26221	1000 Order	100+: $3.5582
296-11555-5-ND	UCC3952DP-4	Texas Instruments	View more Packaging: Tube Part Status: Obsolete Function: Battery Protection Battery Chemistry: Lithium-Ion Number of Cells: 1 Fault Protection: Over Current, Over Temperature, Over/Under Voltage, Short Circuit Operating Temperature: -20C ~ 70C (TA) Package / Case: 16-SOIC (0.154", 3.90mm Width) Supplier Device Package: 16-SOIC Base Part Number: UCC3952-4	1000 Order	--
BQ29400ADCT3-ND	BQ29400ADCT3	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Obsolete Function: Battery Protection Battery Chemistry: Lithium-Ion Number of Cells: 2 ~ 4 Fault Protection: Over Voltage Operating Temperature: -25C ~ 85C (TA) Package / Case: 8-LSSOP, 8-MSOP (0.110", 2.80mm Width) Supplier Device Package: SM8 (SSOP) Base Part Number: BQ29400	1000 Order	--
296-21298-2-ND	BQ29410PWRG4	Texas Instruments	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): 2 (1 Year) Function: Battery Protection Battery Chemistry: Lithium-Ion Number of Cells: 2 ~ 4 Fault Protection: Over Voltage Operating Temperature: -40C ~ 110C (TA) Package / Case: 8-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 8-TSSOP Base Part Number: BQ29410	6000 Order	--
296-45022-5-ND	BQ35100PW	Texas Instruments	View more Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 2 (1 Year) Function: Battery Monitor Battery Chemistry: Multi-Chemistry Interface: IC Operating Temperature: -40C ~ 85C (TA) Package / Case: 14-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 14-TSSOP	1251 Order	1+: $2.3814 10+: $2.1382 100+: $1.7518 500+: $1.4913 1000+: $1.2577
296-43984-2-ND	BQ296113DSGT	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) Function: Battery Protection Battery Chemistry: Lithium-Ion Number of Cells: 2 ~ 4 Fault Protection: Over Voltage Operating Temperature: -40C ~ 110C (TA) Package / Case: 8-WFDFN Exposed Pad Supplier Device Package: 8-WSON (2x2)	2000 Order	250+: $0.4118 500+: $0.3639 1250+: $0.2873
DS2778G+-ND	DS2778G+	Maxim Integrated	View more Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Function: Multi-Function Controller Battery Chemistry: Lithium-Ion/Polymer Number of Cells: 2 Fault Protection: Over Current, Over Voltage Interface: IC Operating Temperature: -20C ~ 70C (TA) Package / Case: 14-WFDFN Exposed Pad Supplier Device Package: 14-TDFN-EP (3x5) Base Part Number: DS2778	1000 Order	1+: $5.3424 10+: $5.0753 25+: $3.6981 50+: $3.5133 100+: $2.4809 250+: $2.4419
DS2741N+-ND	DS2741N+	Maxim Integrated	View more Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Function: Battery Monitor Battery Chemistry: Lithium-Ion Number of Cells: 1 Interface: IC Operating Temperature: -20C ~ 70C (TA) Package / Case: 14-WFDFN Exposed Pad Supplier Device Package: 14-TDFN-EP (3x3) Base Part Number: DS2741	400 Order	1+: $4.0194 10+: $3.7913 25+: $3.0331 50+: $2.8814 100+: $2.6539 250+: $2.5175
LTC2943CDD-1#PB F-ND	LTC2943CDD-1#PB F	Linear Technology/Analog Devices	View more Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Function: Battery Monitor Battery Chemistry: Multi-Chemistry Interface: IC Operating Temperature: 0C ~ 70C (TA) Package / Case: 8-WFDFN Exposed Pad Supplier Device Package: 8-DFN (3x3) Base Part Number: LTC2943	258 Order	1+: $3.7107 25+: $2.4804 100+: $2.1077
S-8211CBN-I6T1U -ND	S-8211CBN-I6T1U	ABLIC U.S.A. Inc.	View more Series: S-8211C Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Function: Battery Protection Battery Chemistry: Lithium-Ion/Polymer Number of Cells: 1 Fault Protection: Over Current, Short Circuit Operating Temperature: -40C ~ 85C (TA) Package / Case: 6-SMD, Flat Leads Supplier Device Package: SNT-6A	1000 Order	5000+: $0.1956
S-8211CCH-I6T1U -ND	S-8211CCH-I6T1U	ABLIC U.S.A. Inc.	View more Series: S-8211C Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Function: Battery Protection Battery Chemistry: Lithium-Ion/Polymer Number of Cells: 1 Fault Protection: Over Current, Short Circuit Operating Temperature: -40C ~ 85C (TA) Package / Case: 6-SMD, Flat Leads Supplier Device Package: SNT-6A	1000 Order	5000+: $0.1956
S-8261AAGMD-G2G T2U-ND	S-8261AAGMD-G2G T2U	ABLIC U.S.A. 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) Function: Battery Protection Battery Chemistry: Lithium-Ion/Polymer Number of Cells: 1 Fault Protection: Over Current, Short Circuit Operating Temperature: -40C ~ 85C (TA) Package / Case: SOT-23-6 Supplier Device Package: SOT-23-6	1000 Order	3000+: $0.2101
S-8261ABRMD-G3R T2U-ND	S-8261ABRMD-G3R T2U	ABLIC U.S.A. 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) Function: Battery Protection Battery Chemistry: Lithium-Ion/Polymer Number of Cells: 1 Fault Protection: Over Current, Short Circuit Operating Temperature: -40C ~ 85C (TA) Package / Case: SOT-23-6 Supplier Device Package: SOT-23-6	1000 Order	3000+: $0.2101
S-8252AAX-M6T1U -ND	S-8252AAX-M6T1U	ABLIC U.S.A. 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) Function: Battery Protection Battery Chemistry: Lithium-Ion/Polymer Number of Cells: 2 Fault Protection: Over Current Operating Temperature: -40C ~ 85C (TA) Package / Case: SOT-23-6 Supplier Device Package: SOT-23-6	1000 Order	3000+: $0.4234
S-8244AAIFN-CEI T2U-ND	S-8244AAIFN-CEI T2U	ABLIC U.S.A. Inc.	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) Function: Battery Protection Battery Chemistry: Lithium-Ion Number of Cells: 1 ~ 4 Fault Protection: Over Voltage Operating Temperature: -40C ~ 85C (TA) Package / Case: 8-LSSOP, 8-MSOP (0.110", 2.80mm Width) Supplier Device Package: 8-MSOP	1000 Order	3000+: $0.4338
S-8232PAFT-T2-G -ND	S-8232PAFT-T2-G	ABLIC U.S.A. Inc.	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) Function: Battery Protection Battery Chemistry: Lithium-Ion/Polymer Number of Cells: 2 Fault Protection: Over Current Operating Temperature: -40C ~ 85C (TA) Package / Case: 8-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 8-TSSOP	1000 Order	3000+: $0.4423
S-8253AAC-T8T1G Z-ND	S-8253AAC-T8T1G Z	ABLIC U.S.A. Inc.	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) Function: Battery Protection Battery Chemistry: Lithium-Ion/Polymer Number of Cells: 2 Fault Protection: Over Current, Short Circuit Operating Temperature: -40C ~ 85C (TA) Package / Case: 8-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 8-TSSOP	1000 Order	3000+: $0.5273
BQ2028YZGT-ND	BQ2028YZGT	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) Function: Multi-Function Controller Number of Cells: 1 Interface: HDQ Operating Temperature: -40C ~ 85C (TA) Package / Case: 12-UFBGA, DSBGA Supplier Device Package: 12-DSBGA Base Part Number: BQ2028	1000 Order	--
296-19574-5-ND	BQ29410PW	Texas Instruments	View more Packaging: Tube Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Not For New Designs Moisture Sensitivity Level (MSL): 1 (Unlimited) Function: Battery Protection Battery Chemistry: Lithium-Ion Number of Cells: 2 ~ 4 Fault Protection: Over Voltage Operating Temperature: -40C ~ 110C (TA) Package / Case: 8-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 8-TSSOP Base Part Number: BQ29410	1000 Order	600+: $0.5965
S-8204AAE-TCT1U -ND	S-8204AAE-TCT1U	ABLIC U.S.A. 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) Function: Battery Protection Battery Chemistry: Lithium-Ion Number of Cells: 3 ~ 4 Fault Protection: Over Current, Short Circuit Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-TSSOP	1000 Order	4000+: $0.8882
S-8204BBJ-TCT1U -ND	S-8204BBJ-TCT1U	ABLIC U.S.A. 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) Function: Battery Protection Battery Chemistry: Lithium-Ion Number of Cells: 3 ~ 4 Fault Protection: Over Current, Short Circuit Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-TSSOP	1000 Order	4000+: $0.8882
S-8205BAM-TCT1U -ND	S-8205BAM-TCT1U	ABLIC U.S.A. 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) Function: Battery Protection Battery Chemistry: Lithium-Ion Number of Cells: 5 Fault Protection: Over Current, Short Circuit Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-TSSOP	1000 Order	4000+: $0.9636
MAX14920ECB+T-N D	MAX14920ECB+T	Maxim Integrated	View more Packaging: Tape & Reel (TR) Part Status: Active Function: Battery Monitor Battery Chemistry: Multi-Chemistry Number of Cells: 1 ~ 12 Fault Protection: Over Temperature, Over/Under Voltage Interface: SPI Operating Temperature: -40C ~ 85C (TA) Package / Case: 64-TQFP Exposed Pad Supplier Device Package: 64-TQFP-EP (10x10) Base Part Number: MAX14920	1000 Order	--
MAX1259EWE+T-ND	MAX1259EWE+T	Maxim Integrated	View more Packaging: Tape & Reel (TR) Part Status: Active Function: Power Management Operating Temperature: -40C ~ 85C (TA) Package / Case: 16-SOIC (0.295", 7.50mm Width) Supplier Device Package: 16-SOIC Base Part Number: MAX1259	1000 Order	1000+: $3.7307
MAX6428MRUR+T-N D	MAX6428MRUR+T	Maxim Integrated	View more Packaging: Tape & Reel (TR) Part Status: Obsolete Function: Battery Monitor Battery Chemistry: Multi-Chemistry Number of Cells: 1 Operating Temperature: -40C ~ 85C (TA) Package / Case: TO-236-3, SC-59, SOT-23-3 Supplier Device Package: SOT-23-3 Base Part Number: MAX6428	1000 Order	--
296-39462-2-ND	TPS650250RHBR	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) Function: Power Management Battery Chemistry: Lithium-Ion/Polymer Number of Cells: 1 Fault Protection: Over Temperature Operating Temperature: -40C ~ 85C (TA) Package / Case: 32-VFQFN Exposed Pad Supplier Device Package: 32-VQFN (5x5) Base Part Number: TPS650250	9000 Order	--
S-8261AAPMD-G2P T2U-ND	S-8261AAPMD-G2P T2U	ABLIC U.S.A. 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) Function: Battery Protection Battery Chemistry: Lithium-Ion/Polymer Number of Cells: 1 Fault Protection: Over Current, Short Circuit Operating Temperature: -40C ~ 85C (TA) Package / Case: SOT-23-6 Supplier Device Package: SOT-23-6	1000 Order	3000+: $0.2101
S-8209ABE-I8T1U -ND	S-8209ABE-I8T1U	ABLIC U.S.A. 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) Function: Multi-Function Controller Battery Chemistry: Lithium-Ion/Polymer Operating Temperature: -40C ~ 85C (TA) Package / Case: 8-SMD, Flat Lead Supplier Device Package: SNT-8A	1000 Order	5000+: $0.4106
S-8209ACL-I8T1U -ND	S-8209ACL-I8T1U	ABLIC U.S.A. 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) Function: Multi-Function Controller Battery Chemistry: Lithium-Ion/Polymer Operating Temperature: -40C ~ 85C (TA) Package / Case: 8-SMD, Flat Lead Supplier Device Package: SNT-8A	1000 Order	5000+: $0.4106
S-8252AAZ-M6T1U -ND	S-8252AAZ-M6T1U	ABLIC U.S.A. 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) Function: Battery Protection Battery Chemistry: Lithium-Ion/Polymer Number of Cells: 2 Fault Protection: Over Current Operating Temperature: -40C ~ 85C (TA) Package / Case: SOT-23-6 Supplier Device Package: SOT-23-6	1000 Order	3000+: $0.4234
S-8232AJFT-T2-G -ND	S-8232AJFT-T2-G	ABLIC U.S.A. Inc.	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) Function: Battery Protection Battery Chemistry: Lithium-Ion/Polymer Number of Cells: 2 Fault Protection: Over Current Operating Temperature: -40C ~ 85C (TA) Package / Case: 8-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 8-TSSOP	1000 Order	3000+: $0.4423
S-8213AAS-I6T1U -ND	S-8213AAS-I6T1U	ABLIC U.S.A. Inc.	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) Function: Battery Protection Battery Chemistry: Lithium-Ion Number of Cells: 2 ~ 3 Operating Temperature: -40C ~ 85C (TA) Package / Case: 6-SMD, Flat Leads Supplier Device Package: SNT-6A	1000 Order	5000+: $0.4586
AP9106GTR-G1DI- ND	AP9106GTR-G1	Diodes Incorporated	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Function: Power Management Battery Chemistry: Lithium-Ion/Polymer Number of Cells: 1 ~ 6 Operating Temperature: -40C ~ 85C (TA) Package / Case: 20-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 20-TSSOP	1000 Order	4000+: $0.4678
LTC4150CMS#TRPB F-ND	LTC4150CMS#TRPB F	Linear Technology/Analog Devices	View more Packaging: Tape & Reel (TR) Lead Free Status / RoHS Status: Lead free / RoHS Compliant Part Status: Active Moisture Sensitivity Level (MSL): 1 (Unlimited) Function: Battery Monitor Battery Chemistry: Multi-Chemistry Number of Cells: 1 ~ 6 Operating Temperature: 0C ~ 70C (TA) Package / Case: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Supplier Device Package: 10-MSOP Base Part Number: LTC4150	1000 Order	2500+: $1.1567

< 13 14 15 16 17 >

Hot Searches: sensor interface program interface capacitive sensor interface touch sensor ic programming sensor on sensor interface on touch sensor on capacitive sensor scrol capacitive sensor capacitive sensor switch capacitive touch sensor button touch sensor slider touch sensor wheel touch sensor digital touch sensor i²c touch sensor smbus touch sensor spi touch sensor open drain touch sensor push-pull touch sensor serial touch sensor

Search Result:sensor interface program

Related Categories