.hide-partial { max-height: none; } .show-more { display: none; }

STMicroelectronics Microcontrollers - MCU

.catnav-wrapper { height: auto; overflow: visible; } .catalog-nav-tabs ul { white-space: normal; }

Types of Microcontrollers - MCU

List Images

Results: 5 362

Applied Filters:

Brand = STMicroelectronics

Mounting Style

Package/Case

Core

Program Memory Size

Data Bus Width

ADC Resolution

Maximum Clock Frequency

Number of I/Os

Data RAM Size

Supply Voltage - Min

Supply Voltage - Max

Minimum Operating Temperature

Maximum Operating Temperature

Qualification

Packaging

Reset All

Search within results

In Stock

Normally Stocked

Active

New Products

RoHS Compliant

.search-refine-wrapper { display: inline-block; min-width: 100%; } .scroll-body { overflow-x: visible; } .search-table-wrapper { overflow: visible; } .hide-partial { max-height: none; } .show-more { display: none; }

Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (SEK) Filter the results in the table by unit price based on your quantity.	Qty.	Mounting Style	Package/Case	Core	Program Memory Size	Data Bus Width	ADC Resolution	Maximum Clock Frequency	Number of I/Os	Data RAM Size	Supply Voltage - Min	Supply Voltage - Max	Minimum Operating Temperature	Maximum Operating Temperature	Packaging
ARM Microcontrollers - MCU STM32 Dynamic Efficiency MCU BAM, High-performance & DSP FPU, Arm Cortex-M4 MCU STM32F410RBT7 STMicroelectronics 1: 58,14 kr 613In Stock 960Expected 2026-10-19	Mfr. Part No. STM32F410RBT7 Mouser Part No 511-STM32F410RBT7	STMicroelectronics	ARM Microcontrollers - MCU STM32 Dynamic Efficiency MCU BAM, High-performance & DSP FPU, Arm Cortex-M4 MCU Learn More about STMicroelectronics stm32f4	Datasheet	613In Stock 960Expected 2026-10-19	58,14 kr 40,88 kr 38,14 kr 31,32 kr View 28,79 kr 25,94 kr 25,72 kr	Min.: 1 Mult.: 1	SMD/SMT	LQFP-64	ARM Cortex M4	128 kB	32 bit	12 bit	100 MHz	50 I/O	32 kB	1.7 V	3.6 V	- 40 C	+ 105 C	Tray
ARM Microcontrollers - MCU STM32 Dynamic Efficiency MCU BAM, High-performance & DSP FPU, Arm Cortex-M4 MCU STM32F410RBT7TR STMicroelectronics 1: 48,69 kr 2 983In Stock	Mfr. Part No. STM32F410RBT7TR Mouser Part No 511-STM32F410RBT7TR	STMicroelectronics	ARM Microcontrollers - MCU STM32 Dynamic Efficiency MCU BAM, High-performance & DSP FPU, Arm Cortex-M4 MCU Learn More about STMicroelectronics stm32f4	Datasheet	2 983In Stock	Cut Tape 48,69 kr 36,93 kr 32,20 kr 30,77 kr Reel 25,83 kr View 28,35 kr 24,18 kr MouseReel Available	Min.: 1 Mult.: 1 : 1 000	SMD/SMT	LQFP-64	ARM Cortex M4	128 kB	32 bit	12 bit	100 MHz	50 I/O	32 kB	1.7 V	3.6 V	- 40 C	+ 105 C	Reel, Cut Tape, MouseReel
ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 256 Kbytes of Flash STM32F411CCU6TR STMicroelectronics 1: 64,51 kr 1 438In Stock	Mfr. Part No. STM32F411CCU6TR Mouser Part No 511-STM32F411CCU6TR	STMicroelectronics	ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 256 Kbytes of Flash Learn More about STMicroelectronics stm32f4	Datasheet	1 438In Stock	Cut Tape 64,51 kr 49,46 kr 43,41 kr 41,54 kr View Reel 32,86 kr 41,10 kr 36,27 kr 33,30 kr 32,86 kr	Min.: 1 Mult.: 1 : 2 500	SMD/SMT	UFQFPN-48	ARM Cortex M4	256 kB	32 bit	12 bit	100 MHz	36 I/O	128 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Reel, Cut Tape
ARM Microcontrollers - MCU STM32 Dyn Eff MCU 512 K 100 MHz CPU STM32F411CEU6 STMicroelectronics 1: 76,60 kr 2 931In Stock 1 560On Order	Mfr. Part No. STM32F411CEU6 Mouser Part No 511-STM32F411CEU6	STMicroelectronics	ARM Microcontrollers - MCU STM32 Dyn Eff MCU 512 K 100 MHz CPU Learn More about STMicroelectronics stm32f4	Datasheet	2 931In Stock 1 560On Order	76,60 kr 55,06 kr 51,87 kr 45,61 kr View 43,52 kr 41,54 kr 40,55 kr 40,44 kr	Min.: 1 Mult.: 1	SMD/SMT	UFQFPN-48	ARM Cortex M4	512 kB	32 bit	12 bit	100 MHz	36 I/O	128 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 256 Kbytes of Flash STM32F411VCT6 STMicroelectronics 1: 72,09 kr 922In Stock	Mfr. Part No. STM32F411VCT6 Mouser Part No 511-STM32F411VCT6	STMicroelectronics	ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 256 Kbytes of Flash Learn More about STMicroelectronics stm32f4	Datasheet	922In Stock	72,09 kr 51,54 kr 47,04 kr 46,93 kr View 43,52 kr 42,42 kr 40,55 kr 40,11 kr Quote	Min.: 1 Mult.: 1	SMD/SMT	LQFP-100	ARM Cortex M4	256 kB	32 bit	12 bit	100 MHz	81 I/O	128 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU STM32 Dynamic Efficiency MCU BAM, High-performance & DSP FPU, Arm Cortex-M4 MCU STM32F412CGU6 STMicroelectronics 1: 99,35 kr 1 179In Stock 12 480On Order	Mfr. Part No. STM32F412CGU6 Mouser Part No 511-STM32F412CGU6	STMicroelectronics	ARM Microcontrollers - MCU STM32 Dynamic Efficiency MCU BAM, High-performance & DSP FPU, Arm Cortex-M4 MCU Learn More about STMicroelectronics stm32f4	Datasheet	1 179In Stock 12 480On Order On Order Ship Dates Mfr. No: STM32F412CGU6 Stock: 1 179 Can Dispatch Immediately On Order: 4 680 Expected 2026-10-12 7 800 TBD Factory Lead Time: 52 Weeks	99,35 kr 76,71 kr 73,30 kr 63,63 kr View 62,97 kr 58,58 kr Quote	Min.: 1 Mult.: 1	SMD/SMT	UFQFPN-48	ARM Cortex M4	1 MB	32 bit	12 bit	100 MHz	36 I/O	256 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU STM32 Dynamic Efficiency MCU BAM, High-performance & DSP FPU, Arm Cortex-M4 MCU STM32F412RET6TR STMicroelectronics 1: 81,77 kr 1 307In Stock	Mfr. Part No. STM32F412RET6TR Mouser Part No 511-STM32F412RET6TR	STMicroelectronics	ARM Microcontrollers - MCU STM32 Dynamic Efficiency MCU BAM, High-performance & DSP FPU, Arm Cortex-M4 MCU Learn More about STMicroelectronics stm32f4	Datasheet	1 307In Stock	Cut Tape 81,77 kr 63,19 kr 55,72 kr 53,52 kr Reel 45,39 kr View 52,86 kr 48,47 kr 44,95 kr Quote MouseReel Available	Min.: 1 Mult.: 1 : 1 000	SMD/SMT	LQFP-64	ARM Cortex M4	512 kB	32 bit	12 bit	100 MHz	50 I/O	256 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Reel, Cut Tape, MouseReel
ARM Microcontrollers - MCU STM32 Dynamic Efficiency MCU BAM, High-performance & DSP FPU, Arm Cortex-M4 MCU STM32F412VGH6 STMicroelectronics 1: 111,11 kr 1 101In Stock 2 496On Order	Mfr. Part No. STM32F412VGH6 Mouser Part No 511-STM32F412VGH6	STMicroelectronics	ARM Microcontrollers - MCU STM32 Dynamic Efficiency MCU BAM, High-performance & DSP FPU, Arm Cortex-M4 MCU Learn More about STMicroelectronics stm32f4	Datasheet	1 101In Stock 2 496On Order	111,11 kr 86,60 kr 76,71 kr 72,75 kr View 70,78 kr 64,62 kr 63,85 kr	Min.: 1 Mult.: 1		UFBGA-100												Tray
ARM Microcontrollers - MCU STM32 Dynamic Efficiency MCU BAM, High-performance & DSP FPU, Arm Cortex-M4 MCU STM32F412ZGT6 STMicroelectronics 1: 122,10 kr 310In Stock 720On Order	Mfr. Part No. STM32F412ZGT6 Mouser Part No 511-STM32F412ZGT6	STMicroelectronics	ARM Microcontrollers - MCU STM32 Dynamic Efficiency MCU BAM, High-performance & DSP FPU, Arm Cortex-M4 MCU Learn More about STMicroelectronics stm32f4	Datasheet	310In Stock 720On Order	122,10 kr 96,93 kr 86,05 kr 81,99 kr View 77,81 kr 74,18 kr 73,30 kr Quote	Min.: 1 Mult.: 1	SMD/SMT	LQFP-144	ARM Cortex M4	1 MB	32 bit	12 bit	100 MHz	114 I/O	256 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 1,5 MByte of Flash 1 STM32F413CHU3 STMicroelectronics 1: 130,78 kr 881In Stock 1 560On Order	Mfr. Part No. STM32F413CHU3 Mouser Part No 511-STM32F413CHU3	STMicroelectronics	ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 1,5 MByte of Flash 1 Learn More about STMicroelectronics stm32f4	Datasheet	881In Stock 1 560On Order	130,78 kr 102,76 kr 91,44 kr 88,03 kr View 86,38 kr 81,99 kr 81,11 kr Quote	Min.: 1 Mult.: 1	SMD/SMT	UFQFPN-48	ARM Cortex M4	1.5 MB	32 bit	12 bit	100 MHz	36 I/O	320 kB	1.7 V	3.6 V	- 40 C	+ 125 C	Tray
ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 1 MByte of Flash 100 STM32F413VGT3 STMicroelectronics 1: 127,26 kr 773In Stock 1 080Expected 2026-10-22	Mfr. Part No. STM32F413VGT3 Mouser Part No 511-STM32F413VGT3	STMicroelectronics	ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 1 MByte of Flash 100 Learn More about STMicroelectronics stm32f4	Datasheet	773In Stock 1 080Expected 2026-10-22	127,26 kr 93,31 kr 86,49 kr 82,10 kr 80,01 kr	Min.: 1 Mult.: 1	SMD/SMT	LQFP-100	ARM Cortex M4	1 MB	32 bit	12 bit	100 MHz	81 I/O	320 kB	1.7 V	3.6 V	- 40 C	+ 125 C	Tray
ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 1 MByte of Flash 100 STM32F413VGT6 STMicroelectronics 1: 112,21 kr 1 111In Stock 1 080On Order	Mfr. Part No. STM32F413VGT6 Mouser Part No 511-STM32F413VGT6	STMicroelectronics	ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 1 MByte of Flash 100 Learn More about STMicroelectronics stm32f4	Datasheet	1 111In Stock 1 080On Order	112,21 kr 81,77 kr 75,17 kr 69,90 kr View 69,57 kr 67,81 kr Quote	Min.: 1 Mult.: 1	SMD/SMT	LQFP-100	ARM Cortex M4	1 MB	32 bit	12 bit	100 MHz	81 I/O	320 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 1,5 MByte of Flash 1 STM32F413VHT6 STMicroelectronics 1: 124,85 kr 1 312In Stock	Mfr. Part No. STM32F413VHT6 Mouser Part No 511-STM32F413VHT6	STMicroelectronics	ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 1,5 MByte of Flash 1 Learn More about STMicroelectronics stm32f4	Datasheet	1 312In Stock	124,85 kr 94,84 kr 90,89 kr 80,01 kr View 76,16 kr 71,22 kr 68,58 kr Quote	Min.: 1 Mult.: 1	SMD/SMT	LQFP-100	ARM Cortex M4	1.5 MB	32 bit	12 bit	100 MHz	81 I/O	320 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 1 MByte of Flash 100 STM32F413ZGT6 STMicroelectronics 1: 126,17 kr 371In Stock	Mfr. Part No. STM32F413ZGT6 Mouser Part No 511-STM32F413ZGT6	STMicroelectronics	ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 1 MByte of Flash 100 Learn More about STMicroelectronics stm32f4	Datasheet	371In Stock	126,17 kr 98,91 kr 90,45 kr 84,62 kr View 81,22 kr 78,69 kr 76,93 kr	Min.: 1 Mult.: 1	SMD/SMT	LQFP-144	ARM Cortex M4	1 MB	32 bit	12 bit	100 MHz	114 I/O	320 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 1,5 MByte of Flash 1 STM32F413ZHT6 STMicroelectronics 1: 134,08 kr 482In Stock 2 520On Order	Mfr. Part No. STM32F413ZHT6 Mouser Part No 511-STM32F413ZHT6	STMicroelectronics	ARM Microcontrollers - MCU High-performance access line, Arm Cortex-M4 core DSP & FPU, 1,5 MByte of Flash 1 Learn More about STMicroelectronics stm32f4	Datasheet	482In Stock 2 520On Order	134,08 kr 105,17 kr 92,87 kr 90,12 kr View 84,95 kr 84,07 kr 79,90 kr	Min.: 1 Mult.: 1	SMD/SMT	LQFP-144	ARM Cortex M4	1.5 MB	32 bit	12 bit	100 MHz	114 I/O	320 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU ARM M4 1024 FLASH 168 Mhz 192kB SRAM STM32F415ZGT6 STMicroelectronics 1: 139,46 kr 251In Stock	Mfr. Part No. STM32F415ZGT6 Mouser Part No 511-STM32F415ZGT6	STMicroelectronics	ARM Microcontrollers - MCU ARM M4 1024 FLASH 168 Mhz 192kB SRAM Learn More about STMicroelectronics stm32f4	Datasheet	251In Stock	139,46 kr 109,68 kr 96,82 kr 93,31 kr View 92,21 kr 87,59 kr 86,16 kr	Min.: 1 Mult.: 1	SMD/SMT	LQFP-144	ARM Cortex M4	1 MB	32 bit	3 x 12 bit	168 MHz	114 I/O	192 kB	1.8 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU ARM M4 1024 FLASH 168 Mhz 192kB SRAM STM32F417VGT6 STMicroelectronics 1: 126,28 kr 521In Stock 1 420Expected 2026-10-05	Mfr. Part No. STM32F417VGT6 Mouser Part No 511-STM32F417VGT6	STMicroelectronics	ARM Microcontrollers - MCU ARM M4 1024 FLASH 168 Mhz 192kB SRAM Learn More about STMicroelectronics stm32f4	Datasheet	521In Stock 1 420Expected 2026-10-05	126,28 kr 100,78 kr 91,22 kr 88,03 kr View 86,27 kr 76,38 kr Quote	Min.: 1 Mult.: 1	SMD/SMT	LQFP-100	ARM Cortex M4	1 MB	32 bit	3 x 12 bit	168 MHz	82 I/O	192 kB	1.8 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU High-performance foundation line, Arm Cortex-M4 core DSP & FPU, 1 Mbyte of Flash STM32F417VGT7 STMicroelectronics 1: 148,15 kr 564In Stock	Mfr. Part No. STM32F417VGT7 Mouser Part No 511-STM32F417VGT7	STMicroelectronics	ARM Microcontrollers - MCU High-performance foundation line, Arm Cortex-M4 core DSP & FPU, 1 Mbyte of Flash Learn More about STMicroelectronics stm32f4	Datasheet	564In Stock	148,15 kr 116,60 kr 100,89 kr 97,59 kr View 96,82 kr 92,87 kr 86,38 kr Quote	Min.: 1 Mult.: 1	SMD/SMT	LQFP-100	ARM Cortex M4	1 MB	32 bit	3 x 12 bit	168 MHz	82 I/O	192 kB	1.8 V	3.6 V	- 40 C	+ 105 C	Tray
ARM Microcontrollers - MCU 32B ARM Cortex-M4 1Mb Flash 168MHz CPU STM32F427VGT6 STMicroelectronics 1: 134,63 kr 1 229In Stock	Mfr. Part No. STM32F427VGT6 Mouser Part No 511-STM32F427VGT6	STMicroelectronics	ARM Microcontrollers - MCU 32B ARM Cortex-M4 1Mb Flash 168MHz CPU Learn More about STMicroelectronics stm32f4	Datasheet	1 229In Stock	134,63 kr 103,75 kr 92,87 kr 89,35 kr View 85,39 kr 83,96 kr 80,23 kr	Min.: 1 Mult.: 1	SMD/SMT	LQFP-100	ARM Cortex M4	1 MB	32 bit	12 bit	180 MHz	82 I/O	260 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU 32B ARM Cortex-M4 2Mb Flash 168MHz CPU STM32F427VIT6 STMicroelectronics 1: 148,91 kr 362In Stock 3 780Expected 2026-10-15	Mfr. Part No. STM32F427VIT6 Mouser Part No 511-STM32F427VIT6	STMicroelectronics	ARM Microcontrollers - MCU 32B ARM Cortex-M4 2Mb Flash 168MHz CPU Learn More about STMicroelectronics stm32f4	Datasheet	362In Stock 3 780Expected 2026-10-15	148,91 kr 116,49 kr 107,70 kr 98,47 kr View 93,20 kr 93,09 kr	Min.: 1 Mult.: 1	SMD/SMT	LQFP-100	ARM Cortex M4	2 MB	32 bit	12 bit	180 MHz	82 I/O	260 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU High-performance advanced line, Arm Cortex-M4 core DSP & FPU, 512 Kbytes of Flas STM32F429IEH6 STMicroelectronics 1: 155,84 kr 213In Stock	Mfr. Part No. STM32F429IEH6 Mouser Part No 511-STM32F429IEH6	STMicroelectronics	ARM Microcontrollers - MCU High-performance advanced line, Arm Cortex-M4 core DSP & FPU, 512 Kbytes of Flas Learn More about STMicroelectronics stm32f4	Datasheet	213In Stock	155,84 kr 122,10 kr 112,21 kr 104,41 kr View 100,78 kr 97,37 kr 93,74 kr Quote	Min.: 1 Mult.: 1	SMD/SMT	BGA-176	ARM Cortex M4	512 kB	32 bit	12 bit	180 MHz	140 I/O	260 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU High-performance advanced line, Arm Cortex-M4 core DSP & FPU, 512 Kbytes of Flas STM32F429IET6 STMicroelectronics 1: 150,01 kr 374In Stock 1 200Expected 2026-09-28	Mfr. Part No. STM32F429IET6 Mouser Part No 511-STM32F429IET6	STMicroelectronics	ARM Microcontrollers - MCU High-performance advanced line, Arm Cortex-M4 core DSP & FPU, 512 Kbytes of Flas Learn More about STMicroelectronics stm32f4	Datasheet	374In Stock 1 200Expected 2026-09-28	150,01 kr 103,20 kr 98,58 kr 92,87 kr	Min.: 1 Mult.: 1	SMD/SMT	LQFP-176	ARM Cortex M4	512 kB	32 bit	12 bit	180 MHz	140 I/O	260 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU DSP FPU ARM CortexM4 1Mb Flash 180MHz STM32F429IGH6 STMicroelectronics 1: 156,50 kr 1 013In Stock	Mfr. Part No. STM32F429IGH6 Mouser Part No 511-STM32F429IGH6	STMicroelectronics	ARM Microcontrollers - MCU DSP FPU ARM CortexM4 1Mb Flash 180MHz Learn More about STMicroelectronics stm32f4	Datasheet	1 013In Stock	156,50 kr 125,29 kr 115,07 kr 107,70 kr View 105,83 kr 102,32 kr 101,11 kr Quote	Min.: 1 Mult.: 1	SMD/SMT	BGA-176	ARM Cortex M4	1 MB	32 bit	12 bit	180 MHz	140 I/O	260 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU DSP FPU ARM CortexM4 2Mb Flash 180MHz STM32F429IIT6 STMicroelectronics 1: 181,12 kr 742In Stock 4 400On Order	Mfr. Part No. STM32F429IIT6 Mouser Part No 511-STM32F429IIT6	STMicroelectronics	ARM Microcontrollers - MCU DSP FPU ARM CortexM4 2Mb Flash 180MHz Learn More about STMicroelectronics stm32f4	Datasheet	742In Stock 4 400On Order	181,12 kr 133,53 kr 123,09 kr 116,05 kr	Min.: 1 Mult.: 1	SMD/SMT	LQFP-176	ARM Cortex M4	2 MB	32 bit	12 bit	180 MHz	140 I/O	260 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Tray
ARM Microcontrollers - MCU High-performance advanced line, Arm Cortex-M4 core DSP & FPU, 512 Kbytes of Flas STM32F429NEH6 STMicroelectronics 1: 165,84 kr 564In Stock	Mfr. Part No. STM32F429NEH6 Mouser Part No 511-STM32F429NEH6	STMicroelectronics	ARM Microcontrollers - MCU High-performance advanced line, Arm Cortex-M4 core DSP & FPU, 512 Kbytes of Flas Learn More about STMicroelectronics stm32f4	Datasheet	564In Stock	165,84 kr 130,67 kr 119,13 kr 111,11 kr View 108,91 kr 104,30 kr 92,65 kr Quote	Min.: 1 Mult.: 1	SMD/SMT	BGA-216	ARM Cortex M4	512 kB	32 bit	12 bit	180 MHz	168 I/O	260 kB	1.7 V	3.6 V	- 40 C	+ 85 C	Tray