8-bit Microcontrollers - MCU 64KB Flash, 4KB RAM, 256B EEPROM, 10-bit ADC2, 5-bit DAC, Comp, PWM, CCP, CWG, HLT, WWDT, SCAN/CRC,ZCD, PPS, EUSART, SPI/I2C, IDLE/DOZE/PMD
PIC18F46K40-E/MV
Microchip Technology
1:
HK$17.92
365 In Stock
Mouser Part No
579-PIC18F46K40-E/MV
Microchip Technology
8-bit Microcontrollers - MCU 64KB Flash, 4KB RAM, 256B EEPROM, 10-bit ADC2, 5-bit DAC, Comp, PWM, CCP, CWG, HLT, WWDT, SCAN/CRC,ZCD, PPS, EUSART, SPI/I2C, IDLE/DOZE/PMD
365 In Stock
Buy
Min.: 1
Mult.: 1
Details
PIC18
64 kB
3.53 kB
UQFN-40
64 MHz
10 bit
36 I/O
2.3 V
5.5 V
SMD/SMT
8 bit
- 40 C
+ 125 C
PIC18(L)F4xK40
AEC-Q100
Tube
8-bit Microcontrollers - MCU 7KB, 512B RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
PIC16F15354-E/SS
Microchip Technology
1:
HK$10.85
643 In Stock
Mouser Part No
579-PIC16F15354-E/SS
Microchip Technology
8-bit Microcontrollers - MCU 7KB, 512B RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
643 In Stock
Alternative Packaging
1
HK$10.85
25
HK$9.95
94
HK$8.96
Buy
Min.: 1
Mult.: 1
Details
PIC16
7 kB
512 B
SSOP-28
32 MHz
10 bit
25 I/O
2.3 V
5.5 V
SMD/SMT
8 bit
- 40 C
+ 125 C
PIC16(L)F153xx
AEC-Q100
Tube
8-bit Microcontrollers - MCU 28KB, 2KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
PIC16F15356-E/SP
Microchip Technology
1:
HK$18.00
373 In Stock
Mouser Part No
579-PIC16F15356-E/SP
Microchip Technology
8-bit Microcontrollers - MCU 28KB, 2KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
373 In Stock
1
HK$18.00
30
HK$16.44
105
HK$16.36
Buy
Min.: 1
Mult.: 1
Details
PIC16
28 kB
2 kB
SPDIP-28
32 MHz
10 bit
25 I/O
2.3 V
5.5 V
Through Hole
8 bit
- 40 C
+ 125 C
PIC16(L)F153xx
AEC-Q100
Tube
8-bit Microcontrollers - MCU 28KB, 2KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 2 EUSART, SPI/I2C
PIC16F15376-E/PT
Microchip Technology
1:
HK$15.62
432 In Stock
Mouser Part No
579-PIC16F15376-E/PT
Microchip Technology
8-bit Microcontrollers - MCU 28KB, 2KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 2 EUSART, SPI/I2C
432 In Stock
1
HK$15.62
25
HK$14.39
100
HK$12.99
250
HK$12.91
Buy
Min.: 1
Mult.: 1
Details
PIC16
28 kB
2 kB
TQFP-44
32 MHz
10 bit
36 I/O
2.3 V
5.5 V
SMD/SMT
8 bit
- 40 C
+ 125 C
PIC16(L)F153xx
AEC-Q100
Tray
8-bit Microcontrollers - MCU 14KB, 1KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
+1 image
PIC16LF15345-I/P
Microchip Technology
1:
HK$14.96
492 In Stock
Mouser Part No
579-PIC16LF15345-I/P
Microchip Technology
8-bit Microcontrollers - MCU 14KB, 1KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
492 In Stock
1
HK$14.96
22
HK$12.99
110
HK$12.91
Buy
Min.: 1
Mult.: 1
Details
PIC16
14 kB
1 kB
PDIP-20
32 MHz
10 bit
18 I/O
1.8 V
3.6 V
Through Hole
8 bit
- 40 C
+ 85 C
PIC16(L)F153xx
Tube
8-bit Microcontrollers - MCU 128KB Flash, 4KB RAM, 256B EEPROM, 10-bit ADC2, 5-bit DAC, Comp, PWM, CCP, CWG, HLT, WWDT, SCAN/CRC, ZCD, PPS, EUSART, SPI/I2C, IDLE/DOZE/PMD
PIC18F27K40-E/SP
Microchip Technology
1:
HK$24.33
504 In Stock
Mouser Part No
579-PIC18F27K40-E/SP
Microchip Technology
8-bit Microcontrollers - MCU 128KB Flash, 4KB RAM, 256B EEPROM, 10-bit ADC2, 5-bit DAC, Comp, PWM, CCP, CWG, HLT, WWDT, SCAN/CRC, ZCD, PPS, EUSART, SPI/I2C, IDLE/DOZE/PMD
504 In Stock
1
HK$24.33
10
HK$22.19
30
HK$20.22
5,010
Quote
5,010
Quote
Buy
Min.: 1
Mult.: 1
Details
PIC18
128 kB
3.6 kB
SPDIP-28
64 MHz
10 bit
25 I/O
2.3 V
5.5 V
Through Hole
8 bit
- 40 C
+ 125 C
PIC18(L)Fx7K40
AEC-Q100
Tube
8-bit Microcontrollers - MCU 7KB, 512B RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
+3 images
PIC16F15354-E/SO
Microchip Technology
1:
HK$11.43
644 In Stock
Mouser Part No
579-PIC16F15354-E/SO
Microchip Technology
8-bit Microcontrollers - MCU 7KB, 512B RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
644 In Stock
Alternative Packaging
1
HK$11.43
10
HK$10.52
27
HK$9.54
5,022
HK$9.45
Buy
Min.: 1
Mult.: 1
Details
PIC16
7 kB
512 B
SOIC-28
32 MHz
10 bit
25 I/O
2.3 V
5.5 V
SMD/SMT
8 bit
- 40 C
+ 125 C
PIC16(L)F153xx
AEC-Q100
Tube
8-bit Microcontrollers - MCU 28KB, 2KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
PIC16F15386T-I/MV
Microchip Technology
1:
HK$14.14
1,046 In Stock
Mouser Part No
579-PIC16F15386TI/MV
Microchip Technology
8-bit Microcontrollers - MCU 28KB, 2KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
1,046 In Stock
Alternative Packaging
1
HK$14.14
25
HK$13.89
1,000
HK$13.15
3,300
HK$11.67
Buy
Min.: 1
Mult.: 1
Reel :
3,300
Details
PIC16
28 kB
2 kB
UQFN-48
32 MHz
10 bit
44 I/O
2.3 V
5.5 V
SMD/SMT
8 bit
- 40 C
+ 85 C
PIC16(L)F153xx
AEC-Q100
Reel, Cut Tape
8-bit Microcontrollers - MCU 32KB Flash, 2KB RAM, 256B EEPROM, 10-bit ADC2, 5-bit DAC, Comp, PWM, CCP, CWG, HLT, WWDT, SCAN/CRC, ZCD, PPS, EUSART, SPI/I2C, IDLE/DOZE/PMD
PIC18F25K40-I/MV
Microchip Technology
1:
HK$13.07
607 In Stock
Mouser Part No
579-PIC18F25K40-I/MV
Microchip Technology
8-bit Microcontrollers - MCU 32KB Flash, 2KB RAM, 256B EEPROM, 10-bit ADC2, 5-bit DAC, Comp, PWM, CCP, CWG, HLT, WWDT, SCAN/CRC, ZCD, PPS, EUSART, SPI/I2C, IDLE/DOZE/PMD
607 In Stock
Alternative Packaging
1
HK$13.07
25
HK$12.00
91
HK$10.85
273
HK$10.77
10,010
Quote
10,010
Quote
Buy
Min.: 1
Mult.: 1
Details
PIC18
32 kB
2 kB
UQFN-28
64 MHz
10 bit
25 I/O
2.3 V
5.5 V
SMD/SMT
8 bit
- 40 C
+ 85 C
PIC18(L)F2xK40
AEC-Q100
Tube
8-bit Microcontrollers - MCU 14KB, 1KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
PIC16F15355-I/SP
Microchip Technology
1:
HK$15.29
667 In Stock
Mouser Part No
579-PIC16F15355-I/SP
Microchip Technology
8-bit Microcontrollers - MCU 14KB, 1KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
667 In Stock
Alternative Packaging
1
HK$15.29
30
HK$13.97
105
HK$12.58
Buy
Min.: 1
Mult.: 1
Details
PIC16
14 kB
1 kB
SPDIP-28
32 MHz
10 bit
25 I/O
2.3 V
5.5 V
Through Hole
8 bit
- 40 C
+ 85 C
PIC16(L)F153xx
AEC-Q100
Tube
8-bit Microcontrollers - MCU 28KB, 2KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
+2 images
PIC16LF15356T-I/MV
Microchip Technology
1:
HK$12.17
8,800 In Stock
Mouser Part No
579-PIC16LF15356TIMV
Microchip Technology
8-bit Microcontrollers - MCU 28KB, 2KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
8,800 In Stock
Alternative Packaging
1
HK$12.17
25
HK$11.84
3,300
HK$10.36
9,900
Quote
9,900
Quote
Buy
Min.: 1
Mult.: 1
Reel :
3,300
Details
PIC16
28 kB
2 kB
UQFN-28
32 MHz
10 bit
25 I/O
1.8 V
3.6 V
SMD/SMT
8 bit
- 40 C
+ 85 C
PIC16(L)F153xx
Reel, Cut Tape, MouseReel
8-bit Microcontrollers - MCU 16KB Flash, 1KB RAM, 256B EEPROM, 10-bit ADC2, 5-bit DAC, Comp, PWM, CCP, CWG, HLT, WWDT, SCAN/CRC,ZCD, PPS, EUSART, SPI/I2C, IDLE/DOZE/PMD
PIC18F24K40-I/MV
Microchip Technology
1:
HK$12.00
545 In Stock
Mouser Part No
579-PIC18F24K40-I/MV
Microchip Technology
8-bit Microcontrollers - MCU 16KB Flash, 1KB RAM, 256B EEPROM, 10-bit ADC2, 5-bit DAC, Comp, PWM, CCP, CWG, HLT, WWDT, SCAN/CRC,ZCD, PPS, EUSART, SPI/I2C, IDLE/DOZE/PMD
545 In Stock
Alternative Packaging
1
HK$12.00
25
HK$11.01
91
HK$10.03
5,005
HK$9.95
10,010
Quote
10,010
Quote
Buy
Min.: 1
Mult.: 1
Details
PIC18
16 kB
1 kB
UQFN-28
64 MHz
10 bit
25 I/O
2.3 V
5.5 V
SMD/SMT
8 bit
- 40 C
+ 85 C
PIC18(L)F2xK40
AEC-Q100
Tube
8-bit Microcontrollers - MCU 12MHz, SOIC, High Grade (+105C), Green
+3 images
ATTINY104-SSNR
Microchip Technology
1:
HK$6.74
1,453 In Stock
Mouser Part No
556-ATTINY104-SSNR
Microchip Technology
8-bit Microcontrollers - MCU 12MHz, SOIC, High Grade (+105C), Green
1,453 In Stock
1
HK$6.74
1,000
HK$6.47
3,000
HK$5.75
Buy
Min.: 1
Mult.: 1
Reel :
3,000
Details
AVR
1 kB
32 B
SOIC-14
12 MHz
10 bit
6 I/O
1.8 V
5.5 V
SMD/SMT
8 bit
- 40 C
+ 125 C
ATtiny104
Reel, Cut Tape, MouseReel
8-bit Microcontrollers - MCU 28KB, 2KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
PIC16F15376-I/ML
Microchip Technology
1:
HK$15.04
445 In Stock
Mouser Part No
579-PIC16F15376-I/ML
Microchip Technology
8-bit Microcontrollers - MCU 28KB, 2KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
445 In Stock
Alternative Packaging
Buy
Min.: 1
Mult.: 1
Details
PIC16
28 kB
2 kB
QFN-44
32 MHz
10 bit
36 I/O
2.3 V
5.5 V
SMD/SMT
8 bit
- 40 C
+ 85 C
PIC16(L)F153xx
AEC-Q100
Tube
8-bit Microcontrollers - MCU 28KB, 2KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 2 EUSART, SPI/I2C
PIC16F15376-I/PT
Microchip Technology
1:
HK$14.39
557 In Stock
Mouser Part No
579-PIC16F15376-I/PT
Microchip Technology
8-bit Microcontrollers - MCU 28KB, 2KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 2 EUSART, SPI/I2C
557 In Stock
Alternative Packaging
1
HK$14.39
10
HK$14.22
25
HK$12.99
100
HK$11.59
250
HK$11.51
Buy
Min.: 1
Mult.: 1
Details
PIC16
28 kB
2 kB
TQFP-44
32 MHz
10 bit
36 I/O
2.3 V
5.5 V
SMD/SMT
8 bit
- 40 C
+ 85 C
PIC16(L)F153xx
AEC-Q100
Tray
8-bit Microcontrollers - MCU 3.5KB, 256B RAM, 4xPWMs, Comparator, DAC, ADC, 4xCLC, CWG, EUSART, SPI/I2C
+1 image
PIC16F15313-E/P
Microchip Technology
1:
HK$8.80
1,351 In Stock
Mouser Part No
579-PIC16F15313-E/P
Microchip Technology
8-bit Microcontrollers - MCU 3.5KB, 256B RAM, 4xPWMs, Comparator, DAC, ADC, 4xCLC, CWG, EUSART, SPI/I2C
1,351 In Stock
1
HK$8.80
25
HK$7.56
10,020
HK$7.55
Buy
Min.: 1
Mult.: 1
Details
PIC16
3.5 kB
256 B
PDIP-8
32 MHz
10 bit
6 I/O
2.3 V
5.5 V
Through Hole
8 bit
- 40 C
+ 125 C
PIC16(L)F153xx
AEC-Q100
Tube
8-bit Microcontrollers - MCU 14KB, 1KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
PIC16F15385-I/MV
Microchip Technology
1:
HK$12.58
844 In Stock
Mouser Part No
579-PIC16F15385-I/MV
Microchip Technology
8-bit Microcontrollers - MCU 14KB, 1KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
844 In Stock
1
HK$12.58
100
HK$11.84
244
HK$11.51
Buy
Min.: 1
Mult.: 1
Details
PIC16
14 kB
1 kB
UQFN-48
32 MHz
10 bit
44 I/O
2.3 V
5.5 V
SMD/SMT
8 bit
- 40 C
+ 85 C
PIC16(L)F153xx
AEC-Q100
Tube
8-bit Microcontrollers - MCU 7KB, 512B RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
PIC16F15354-I/SS
Microchip Technology
1:
HK$9.54
870 In Stock
Mouser Part No
579-PIC16F15354-I/SS
Microchip Technology
8-bit Microcontrollers - MCU 7KB, 512B RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
870 In Stock
Alternative Packaging
1
HK$9.54
25
HK$8.47
94
HK$8.01
517
HK$7.95
Buy
Min.: 1
Mult.: 1
Details
PIC16
7 kB
512 B
SSOP-28
32 MHz
10 bit
25 I/O
2.3 V
5.5 V
SMD/SMT
8 bit
- 40 C
+ 85 C
PIC16(L)F153xx
AEC-Q100
Tube
8-bit Microcontrollers - MCU 14KB, 1KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 2 EUSART, SPI/I2C
PIC16F15375T-I/PT
Microchip Technology
1:
HK$14.14
2,553 In Stock
Mouser Part No
579-PIC16F15375TI/PT
Microchip Technology
8-bit Microcontrollers - MCU 14KB, 1KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 2 EUSART, SPI/I2C
2,553 In Stock
Alternative Packaging
1
HK$14.14
25
HK$13.97
500
HK$12.00
1,200
HK$11.67
9,600
Quote
9,600
Quote
Buy
Min.: 1
Mult.: 1
Reel :
1,200
Details
PIC16
14 kB
1 kB
TQFP-44
32 MHz
10 bit
36 I/O
2.3 V
5.5 V
SMD/SMT
8 bit
- 40 C
+ 85 C
PIC16(L)F153xx
AEC-Q100
Reel, Cut Tape
8-bit Microcontrollers - MCU 28KB, 2KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
PIC16LF15376-I/P
Microchip Technology
1:
HK$18.82
1,133 In Stock
Mouser Part No
579-PIC16LF15376-I/P
Microchip Technology
8-bit Microcontrollers - MCU 28KB, 2KB RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 4xCLC, 2 EUSART, SPI/I2C
1,133 In Stock
1
HK$18.82
10
HK$18.66
100
HK$17.51
250
HK$16.77
Buy
Min.: 1
Mult.: 1
Details
PIC16
28 kB
2 kB
PDIP-40
32 MHz
10 bit
36 I/O
1.8 V
3.6 V
Through Hole
8 bit
- 40 C
+ 85 C
PIC16(L)F153xx
Tube
8-bit Microcontrollers - MCU 64KB Flash, 4KB RAM, 256B EEPROM, 10-bit ADC2, 5-bit DAC, Comp, PWM, CCP, CWG, HLT, WWDT, SCAN/CRC, ZCD, PPS, EUSART, SPI/I2C, IDLE/DOZE/PMD
PIC18F46K40-I/ML
Microchip Technology
1:
HK$16.93
358 In Stock
Mouser Part No
579-PIC18F46K40-I/ML
Microchip Technology
8-bit Microcontrollers - MCU 64KB Flash, 4KB RAM, 256B EEPROM, 10-bit ADC2, 5-bit DAC, Comp, PWM, CCP, CWG, HLT, WWDT, SCAN/CRC, ZCD, PPS, EUSART, SPI/I2C, IDLE/DOZE/PMD
358 In Stock
Alternative Packaging
1
HK$16.93
90
HK$16.85
540
HK$15.95
1,035
HK$15.86
Buy
Min.: 1
Mult.: 1
Details
PIC18
64 kB
3.53 kB
QFN-44
64 MHz
10 bit
36 I/O
2.3 V
5.5 V
SMD/SMT
8 bit
- 40 C
+ 85 C
PIC18(L)F4xK40
AEC-Q100
Tube
8-bit Microcontrollers - MCU 14KB, 1KB RAM, 4xPWMs, Comparator, DAC, ADC, 4xCLC, CWG, 2xEUSART, SPI/I2C
+1 image
PIC16LF15325-I/P
Microchip Technology
1:
HK$11.59
298 In Stock
720 Expected 31/8/2026
Mouser Part No
579-PIC16LF15325-I/P
Microchip Technology
8-bit Microcontrollers - MCU 14KB, 1KB RAM, 4xPWMs, Comparator, DAC, ADC, 4xCLC, CWG, 2xEUSART, SPI/I2C
298 In Stock
720 Expected 31/8/2026
Buy
Min.: 1
Mult.: 1
Details
PIC16
14 kB
1 kB
PDIP-14
32 MHz
10 bit
12 I/O
1.8 V
3.6 V
Through Hole
8 bit
- 40 C
+ 85 C
PIC16(L)F153xx
Tube
8-bit Microcontrollers - MCU 7KB, 512B RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 2 EUSART, SPI/I2C
+2 images
PIC16F15344-I/GZ
Microchip Technology
1:
HK$9.54
931 In Stock
Mouser Part No
579-PIC16F15344-I/GZ
Microchip Technology
8-bit Microcontrollers - MCU 7KB, 512B RAM, 4xPWMs, Comparator, DAC, ADC, CWG, 2 EUSART, SPI/I2C
931 In Stock
1
HK$9.54
10
HK$9.29
25
HK$8.63
91
HK$7.89
Buy
Min.: 1
Mult.: 1
Details
PIC16
7 kB
512 B
UQFN-20
32 MHz
10 bit
18 I/O
2.3 V
5.5 V
SMD/SMT
8 bit
- 40 C
+ 85 C
PIC16(L)F153xx
AEC-Q100
Tube
8-bit Microcontrollers - MCU 3.5KB, 256B RAM, 4xPWMs, Comparator, DAC, ADC, 4xCLC, CWG, EUSART, SPI/I2C
+1 image
PIC16F15323-E/P
Microchip Technology
1:
HK$9.95
805 In Stock
Mouser Part No
579-PIC16F15323-E/P
Microchip Technology
8-bit Microcontrollers - MCU 3.5KB, 256B RAM, 4xPWMs, Comparator, DAC, ADC, 4xCLC, CWG, EUSART, SPI/I2C
805 In Stock
1
HK$9.95
10
HK$9.54
30
HK$8.63
120
HK$8.55
Buy
Min.: 1
Mult.: 1
Details
PIC16
3.5 kB
256 B
PDIP-14
32 MHz
10 bit
12 I/O
2.3 V
5.5 V
Through Hole
8 bit
- 40 C
+ 125 C
PIC16(L)F153xx
Tube
8-bit Microcontrollers - MCU 32KB Flash, 2KB RAM, 256B EEPROM, 10-bit ADC2, 5-bit DAC, Comp, PWM, CCP, CWG, HLT, WWDT, SCAN/CRC,ZCD, PPS, EUSART, SPI/I2C, IDLE/DOZE/PMD
PIC18F45K40-E/ML
Microchip Technology
1:
HK$17.59
597 In Stock
Mouser Part No
579-PIC18F45K40-E/ML
Microchip Technology
8-bit Microcontrollers - MCU 32KB Flash, 2KB RAM, 256B EEPROM, 10-bit ADC2, 5-bit DAC, Comp, PWM, CCP, CWG, HLT, WWDT, SCAN/CRC,ZCD, PPS, EUSART, SPI/I2C, IDLE/DOZE/PMD
597 In Stock
1
HK$17.59
90
HK$17.51
270
HK$16.85
Buy
Min.: 1
Mult.: 1
Details
PIC18
QFN-44
SMD/SMT
PIC18(L)F4xK40
AEC-Q100
Tube