ARM Microcontrollers - MCU Ultra-low power Arm Cortex-M0+ MCU 64 Kbytes of Flash , 32 MHz CPU, USB
STM32L052C8U6
STMicroelectronics
1:
3,20 €
98 In Stock
27.687 Expected 12/22/2026
Mouser Part No
511-STM32L052C8U6
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low power Arm Cortex-M0+ MCU 64 Kbytes of Flash , 32 MHz CPU, USB
98 In Stock
27.687 Expected 12/22/2026
1
3,20 €
10
2,25 €
25
2,06 €
100
1,75 €
250
View
250
1,66 €
500
1,52 €
Buy
Min.: 1
Mult.: 1
Details
STM32L0
SMD/SMT
UFQFPN-48
ARM Cortex M0+
64 kB
32 bit
12 bit
32 MHz
37 I/O
8 kB
1.8 V
3.6 V
- 40 C
+ 85 C
Tray
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 64 Kbytes of Flash , 32 MHz CPU
STM32L051K8U6
STMicroelectronics
1:
2,57 €
882 In Stock
5.880 On Order
Mouser Part No
511-STM32L051K8U6
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 64 Kbytes of Flash , 32 MHz CPU
882 In Stock
5.880 On Order
View Dates
Stock:
882 Can Dispatch Immediately
On Order:
2.940 Expected 11/30/2026
2.940 Expected 3/15/2027
Factory Lead Time:
40 Weeks
1
2,57 €
10
1,90 €
25
1,79 €
100
1,64 €
250
View
250
1,54 €
500
1,35 €
1.000
1,26 €
Buy
Min.: 1
Mult.: 1
Details
STM32L051K8
SMD/SMT
UFQFPN-32
ARM Cortex M0+
64 kB
32 bit
12 bit
32 MHz
27 I/O
8 kB
1.8 V
3.6 V
- 40 C
+ 85 C
Tray
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 64 Kbytes of Flash , 32 MHz
STM32L051R8T6
STMicroelectronics
1:
3,30 €
191 In Stock
960 Expected 3/29/2027
Mouser Part No
511-STM32L051R8T6
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 64 Kbytes of Flash , 32 MHz
191 In Stock
960 Expected 3/29/2027
1
3,30 €
10
2,33 €
25
2,06 €
100
1,87 €
250
View
250
1,75 €
960
1,74 €
Buy
Min.: 1
Mult.: 1
Details
STM32L051R8
SMD/SMT
LQFP-64
ARM Cortex M0+
64 kB
32 bit
12 bit
32 MHz
51 I/O
8 kB
1.8 V
3.6 V
- 40 C
+ 85 C
Tray
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 16-Kbytes of Flash , 32 MHz CPU, AES
+1 image
STM32L021D4P6
STMicroelectronics
1:
2,03 €
295 In Stock
960 Expected 9/4/2026
Mouser Part No
511-STM32L021D4P6
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 16-Kbytes of Flash , 32 MHz CPU, AES
295 In Stock
960 Expected 9/4/2026
1
2,03 €
10
1,38 €
25
1,19 €
100
1,06 €
250
View
250
0,998 €
500
0,963 €
Buy
Min.: 1
Mult.: 1
Details
STM32L021D4
ARM Cortex M0+
16 kB
32 bit
12 bit
32 MHz
11 I/O
2 kB
1.8 V
3.6 V
Tube
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 128-Kbytes of Flash , 32 MHz CPU, USB
STM32L072VBT6
STMicroelectronics
1:
5,64 €
7 In Stock
1.080 Expected 6/14/2027
Mouser Part No
511-STM32L072VBT6
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 128-Kbytes of Flash , 32 MHz CPU, USB
7 In Stock
1.080 Expected 6/14/2027
1
5,64 €
10
4,08 €
25
3,78 €
100
3,41 €
250
View
250
3,27 €
540
3,08 €
1.080
3,05 €
Buy
Min.: 1
Mult.: 1
Details
STM32L072VB
SMD/SMT
LQFP-100
ARM Cortex M0+
128 kB
32 bit
12 bit
32 MHz
84 I/O
20 kB
1.65 V
3.6 V
- 40 C
+ 85 C
Tray
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 256 Kbytes of Flash , LCD, USB
STM32L433RCT3
STMicroelectronics
1:
6,42 €
40 In Stock
1.920 On Order
Mouser Part No
511-STM32L433RCT3
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 256 Kbytes of Flash , LCD, USB
40 In Stock
1.920 On Order
1
6,42 €
10
4,94 €
25
4,34 €
100
4,16 €
250
View
250
4,04 €
500
3,69 €
960
3,32 €
2.880
3,29 €
Buy
Min.: 1
Mult.: 1
Details
STM32L433RC
SMD/SMT
LQFP-64
ARM Cortex M4
256 kB
32 bit
12 bit
80 MHz
52 I/O
64 kB
1.71 V
3.6 V
- 40 C
+ 125 C
Tray
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 256 Kbytes of Flash , LCD, USB
STM32L433RCT6P
STMicroelectronics
1:
6,70 €
5 In Stock
1.920 On Order
Mouser Part No
511-STM32L433RCT6P
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 256 Kbytes of Flash , LCD, USB
5 In Stock
1.920 On Order
1
6,70 €
10
4,72 €
25
4,29 €
100
3,96 €
250
View
250
3,84 €
500
3,53 €
960
3,36 €
Buy
Min.: 1
Mult.: 1
Details
STM32L433RC
SMD/SMT
LQFP-64
ARM Cortex M4
256 kB
32 bit
12 bit
80 MHz
52 I/O
64 kB
1.71 V
3.6 V
- 40 C
+ 85 C
Tray
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 120 MHz 1024 kbytes of Flash USB OTG, DFSD
STM32L4R9ZGJ6
STMicroelectronics
1:
16,21 €
15 In Stock
6.048 On Order
Mouser Part No
511-STM32L4R9ZGJ6
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 120 MHz 1024 kbytes of Flash USB OTG, DFSD
15 In Stock
6.048 On Order
1
16,21 €
10
12,83 €
25
11,45 €
100
10,35 €
Buy
Min.: 1
Mult.: 1
Details
STM32L4R9ZG
SMD/SMT
UFBGA-144
ARM Cortex M4
1 MB
32 bit
12 bit
120 MHz
112 I/O
640 kB
1.71 V
3.6 V
- 40 C
+ 85 C
Tray
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 128 Kbytes of Flash , USB
STM32L412KBU6
STMicroelectronics
1:
3,26 €
71 In Stock
14.700 On Order
Mouser Part No
511-STM32L412KBU6
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 128 Kbytes of Flash , USB
71 In Stock
14.700 On Order
View Dates
Alternative Packaging
Stock:
71 Can Dispatch Immediately
Factory Lead Time:
52 Weeks
1
3,26 €
10
2,52 €
25
2,22 €
100
2,12 €
250
View
250
1,96 €
500
1,90 €
1.000
1,81 €
2.940
1,79 €
5.880
1,61 €
Buy
Min.: 1
Mult.: 1
Details
STM32L412KB
SMD/SMT
UFQFPN-32
ARM Cortex M4
128 kB
32 bit
2 x 12 bit
80 MHz
26 I/O
40 kB
1.71 V
3.6 V
- 40 C
+ 85 C
Tray
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 32-Kbytes Flash memory, 32 MHz CPU, AES
+2 images
STM32L041E6Y6DTR
STMicroelectronics
1:
2,55 €
5.358 In Stock
Mouser Part No
511-STM32L041E6Y6DTR
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 32-Kbytes Flash memory, 32 MHz CPU, AES
5.358 In Stock
1
2,55 €
10
1,66 €
25
1,53 €
100
1,32 €
250
View
5.000
0,972 €
250
1,23 €
500
1,08 €
1.000
0,972 €
5.000
0,972 €
Buy
Min.: 1
Mult.: 1
Reel :
5.000
Details
Reel, Cut Tape, MouseReel
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 1 Mbyte of Flash USB OTG, LCD, DFSD
STM32L496RGT3
STMicroelectronics
1:
11,66 €
17 In Stock
910 Expected 9/7/2026
Mouser Part No
511-STM32L496RGT3
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 1 Mbyte of Flash USB OTG, LCD, DFSD
17 In Stock
910 Expected 9/7/2026
Alternative Packaging
1
11,66 €
10
8,86 €
25
8,49 €
100
7,48 €
250
View
250
7,20 €
500
6,81 €
960
6,67 €
Buy
Min.: 1
Mult.: 1
Details
STM32L496RG
SMD/SMT
LQFP-64
ARM Cortex M4
1 MB
32 bit
3 x 12 bit
80 MHz
52 I/O
320 kB
1.71 V
3.6 V
- 40 C
+ 125 C
Tray
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M3 MCU 64 Kbytes of Flash , 32 MHz CPU, USB
STM32L151C8U6A
STMicroelectronics
1:
6,30 €
45 In Stock
1.560 Expected 12/21/2026
Mouser Part No
511-STM32L151C8U6A
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M3 MCU 64 Kbytes of Flash , 32 MHz CPU, USB
45 In Stock
1.560 Expected 12/21/2026
1
6,30 €
10
4,64 €
25
4,31 €
100
3,64 €
250
View
250
3,45 €
500
3,20 €
1.000
3,16 €
Buy
Min.: 1
Mult.: 1
Details
STM32L151C8-A
SMD/SMT
UFQPFN-48
ARM Cortex M3
64 kB
32 bit
12 bit
32 MHz
37 I/O
10 kB
1.65 V
3.6 V
- 40 C
+ 85 C
Tray
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 128-Kbytes of Flash , 32 MHz CPU
STM32L071RBT6TR
STMicroelectronics
1:
4,82 €
58 In Stock
6.000 Expected 7/5/2027
Mouser Part No
511-STM32L071RBT6TR
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 128-Kbytes of Flash , 32 MHz CPU
58 In Stock
6.000 Expected 7/5/2027
1
4,82 €
10
3,44 €
25
3,12 €
100
2,84 €
250
View
1.000
2,41 €
250
2,76 €
500
2,50 €
1.000
2,41 €
Buy
Min.: 1
Mult.: 1
Reel :
1.000
Details
STM32L071RB
SMD/SMT
LQFP-64
ARM Cortex M0+
128 kB
32 bit
12 bit
32 MHz
51 I/O
20 kB
1.8 V
3.6 V
- 40 C
+ 85 C
Reel, Cut Tape, MouseReel
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU with 32-Kbytes of Flash memory, 32 MHz CPU
STM32L031C6T6TR
STMicroelectronics
1:
2,93 €
1.055 In Stock
2.400 On Order
Mouser Part No
511-STM32L031C6T6TR
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU with 32-Kbytes of Flash memory, 32 MHz CPU
1.055 In Stock
2.400 On Order
1
2,93 €
10
1,93 €
25
1,79 €
100
1,56 €
2.400
1,03 €
4.800
View
250
1,46 €
500
1,27 €
1.000
1,17 €
4.800
0,998 €
Buy
Min.: 1
Mult.: 1
Reel :
2.400
Details
STM32L0
Reel, Cut Tape, MouseReel
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 64 Kbytes of Flash , 32 MHz CPU, USB, LCD
STM32L053R8H6
STMicroelectronics
1:
4,13 €
46 In Stock
7.680 Expected 7/26/2027
Mouser Part No
511-STM32L053R8H6
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 64 Kbytes of Flash , 32 MHz CPU, USB, LCD
46 In Stock
7.680 Expected 7/26/2027
1
4,13 €
10
3,13 €
25
2,73 €
100
2,04 €
250
View
250
1,98 €
500
1,78 €
1.000
1,68 €
3.840
1,63 €
Buy
Min.: 1
Mult.: 1
Details
STM32L053R8
SMD/SMT
TFBGA-64
Tray
ARM Microcontrollers - MCU Ultra-low power Arm Cortex-M0+ MCU 64-Kbyte of Flash , 32 MHz CPU, USB
STM32L052K8U6TR
STMicroelectronics
1:
3,04 €
510 In Stock
6.000 On Order
Mouser Part No
511-STM32L052K8U6TR
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low power Arm Cortex-M0+ MCU 64-Kbyte of Flash , 32 MHz CPU, USB
510 In Stock
6.000 On Order
View Dates
Stock:
510 Can Dispatch Immediately
On Order:
3.000 Expected 12/16/2026
3.000 Expected 4/5/2027
Factory Lead Time:
40 Weeks
1
3,04 €
10
2,14 €
25
1,93 €
100
1,74 €
250
View
3.000
1,35 €
250
1,69 €
500
1,52 €
1.000
1,45 €
3.000
1,35 €
Buy
Min.: 1
Mult.: 1
Reel :
3.000
Details
STM32L052K8
SMD/SMT
UFQFPN-32
ARM Cortex M0+
64 kB
32 bit
12 bit
32 MHz
27 I/O
8 kB
1.8 V
3.6 V
- 40 C
+ 85 C
Reel, Cut Tape
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M3 MCU 128 Kbytes of Flash , 32 MHz CPU, USB
STM32L151RBT6ATR
STMicroelectronics
1:
7,28 €
7 In Stock
2.000 Expected 3/29/2027
Mouser Part No
511-STM32L151RBT6ATR
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M3 MCU 128 Kbytes of Flash , 32 MHz CPU, USB
7 In Stock
2.000 Expected 3/29/2027
Alternative Packaging
1
7,28 €
10
5,38 €
25
4,88 €
100
4,43 €
250
View
1.000
3,95 €
250
4,33 €
500
3,96 €
1.000
3,95 €
Buy
Min.: 1
Mult.: 1
Reel :
1.000
Details
STM32L151RB-A
SMD/SMT
LQFP-64
ARM Cortex M3
128 kB
32 bit
12 bit
32 MHz
51 I/O
16 kB
1.65 V
3.6 V
- 40 C
+ 85 C
Reel, Cut Tape, MouseReel
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 32 Kbytes of Flash , 32 MHz CPU, USB, LCD
STM32L053R6T6
STMicroelectronics
1:
2,97 €
659 In Stock
Mouser Part No
511-STM32L053R6T6
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 32 Kbytes of Flash , 32 MHz CPU, USB, LCD
659 In Stock
Alternative Packaging
1
2,97 €
10
2,20 €
25
1,93 €
100
1,75 €
250
View
250
1,71 €
500
1,69 €
960
1,34 €
2.880
1,32 €
5.760
1,29 €
Buy
Min.: 1
Mult.: 1
Details
STM32L053R6
SMD/SMT
LQFP-64
ARM Cortex M0+
32 kB
32 bit
12 bit
32 MHz
51 I/O
8 kB
1.8 V
3.6 V
- 40 C
+ 85 C
Tray
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 512 Kbytes of Flash LCD, USB OTG, D
STM32L476VET6
STMicroelectronics
1:
9,21 €
27 In Stock
1.080 On Order
Mouser Part No
511-STM32L476VET6
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 512 Kbytes of Flash LCD, USB OTG, D
27 In Stock
1.080 On Order
Alternative Packaging
1
9,21 €
10
6,67 €
25
6,11 €
100
5,67 €
Buy
Min.: 1
Mult.: 1
Details
STM32L476VE
SMD/SMT
LQFP-100
ARM Cortex M4
512 kB
32 bit
3 x 12 bit
80 MHz
82 I/O
128 kB
1.71 V
3.6 V
- 40 C
+ 85 C
Tray
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 512 kbytes of Flash USB OTG, LCD, D
STM32L496VET6
STMicroelectronics
1:
10,11 €
24 In Stock
540 On Order
Mouser Part No
511-STM32L496VET6
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 512 kbytes of Flash USB OTG, LCD, D
24 In Stock
540 On Order
Alternative Packaging
1
10,11 €
10
7,35 €
25
6,75 €
100
6,65 €
250
View
250
6,26 €
540
5,96 €
1.080
5,64 €
2.700
Quote
Buy
Min.: 1
Mult.: 1
Details
STM32L496VE
SMD/SMT
LQFP-100
ARM Cortex M4
512 kB
32 bit
3 x 12 bit
80 MHz
83 I/O
320 kB
1.71 V
3.6 V
- 40 C
+ 85 C
Tray
ARM Microcontrollers - MCU Ultra-low power Arm Cortex-M0+ MCU 64-Kbyte of Flash , 32 MHz CPU, USB
STM32L052K8U6
STMicroelectronics
1:
2,86 €
101 In Stock
5.880 Expected 12/16/2026
Mouser Part No
511-STM32L052K8U6
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low power Arm Cortex-M0+ MCU 64-Kbyte of Flash , 32 MHz CPU, USB
101 In Stock
5.880 Expected 12/16/2026
1
2,86 €
10
2,08 €
25
1,89 €
100
1,72 €
250
View
250
1,62 €
500
1,50 €
Buy
Min.: 1
Mult.: 1
Details
STM32L052K8
SMD/SMT
UFQFPN-32
ARM Cortex M0+
64 kB
32 bit
12 bit
32 MHz
27 I/O
8 kB
1.8 V
3.6 V
- 40 C
+ 85 C
Tray
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 192-Kbytes of Flash , 32 MHz CPU
+1 image
STM32L071KZT6
STMicroelectronics
1:
4,88 €
149 In Stock
3.000 On Order
Mouser Part No
511-STM32L071KZT6
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power Arm Cortex-M0+ MCU 192-Kbytes of Flash , 32 MHz CPU
149 In Stock
3.000 On Order
View Dates
Stock:
149 Can Dispatch Immediately
On Order:
1.500 Expected 12/21/2026
1.500 Expected 5/17/2027
Factory Lead Time:
40 Weeks
1
4,88 €
10
3,29 €
25
2,97 €
100
2,65 €
250
View
250
2,54 €
500
2,31 €
1.000
2,18 €
1.500
2,12 €
Buy
Min.: 1
Mult.: 1
Details
STM32L071KZ
SMD/SMT
LQFP-32
ARM Cortex M0+
192 kB
32 bit
12 bit
32 MHz
25 I/O
20 kB
1.65 V
3.6 V
- 40 C
+ 125 C
Tray
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 512 Kbytes of Flash , DFSDM
STM32L471ZET6
STMicroelectronics
1:
9,74 €
9 In Stock
360 On Order
Mouser Part No
511-STM32L471ZET6
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 512 Kbytes of Flash , DFSDM
9 In Stock
360 On Order
Alternative Packaging
1
9,74 €
10
7,39 €
25
6,83 €
100
6,18 €
250
5,72 €
Buy
Min.: 1
Mult.: 1
Details
STM32L471ZE
SMD/SMT
LQFP-144
ARM Cortex M4
512 kB
32 bit
12 bit
80 MHz
114 I/O
128 kB
1.71 V
3.6 V
- 40 C
+ 85 C
Tray
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 512 Kbytes of Flash USB OTG, DFSDM
STM32L475RET6
STMicroelectronics
1:
7,71 €
91 In Stock
960 On Order
Mouser Part No
511-STM32L475RET6
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 80 MHz 512 Kbytes of Flash USB OTG, DFSDM
91 In Stock
960 On Order
Alternative Packaging
1
7,71 €
10
5,97 €
25
5,27 €
100
5,06 €
250
View
250
4,95 €
500
4,52 €
960
4,20 €
2.880
4,00 €
5.760
Quote
Buy
Min.: 1
Mult.: 1
Details
STM32L475RE
SMD/SMT
LQFP-64
ARM Cortex M4
512 kB
32 bit
3 x 12 bit
80 MHz
51 I/O
128 kB
1.71 V
3.6 V
- 40 C
+ 85 C
Tray
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 120 MHz 2048 kbytes of Flash USB OTG, DFSD
STM32L4R5ZIT6P
STMicroelectronics
1:
14,96 €
107 In Stock
360 Expected 11/27/2026
Mouser Part No
511-STM32L4R5ZIT6P
STMicroelectronics
ARM Microcontrollers - MCU Ultra-low-power FPU Arm Cortex-M4 MCU 120 MHz 2048 kbytes of Flash USB OTG, DFSD
107 In Stock
360 Expected 11/27/2026
1
14,96 €
10
11,69 €
25
10,75 €
100
9,86 €
250
9,31 €
Buy
Min.: 1
Mult.: 1
Details
STM32L4R5ZI
SMD/SMT
LQFP-144
ARM Cortex M4
2 MB
32 bit
12 bit
120 MHz
115 I/O
640 kB
1.14 V
1.4 V
- 40 C
+ 85 C
Tray