Where to buy STM32F105

55 offers from 5 suppliers
N Provider Headquarters Delivery Location
Photo
Product
Manufacturer
Urgency of price list
Description
Price
Pricing conditions
Delivery time
Stock
1 ChipWorker China All over the world
STM32F105RCT6
STM32F105RCT6
STMicroelectronics
02 Apr 2025 20:40
Микросхема Микроконтроллер, MCU 32Bit ARM Cortex M3 RISC 256KB Flash 2 ...
Next
1.38 $
2-5 days
stock 7843 pcs
2 AllElco Electronics China All over the world
STM32F105RBT6
STM32F105RBT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 64LQFP
1.42 $
от 960
5-7 days
stock 9760 pcs
STM32F105VBH6
STM32F105VBH6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 100BGA
1.59 $
от 1104
5-7 days
stock 6021 pcs
STM32F105VBT6
STM32F105VBT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 100LQFP
1.59 $
от 990
5-7 days
stock 8437 pcs
STM32F105RBT6
STM32F105RBT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 64LQFP
1.61 $
от 480
5-7 days
stock 9760 pcs
STM32F105RCT6
STM32F105RCT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 64LQFP
1.63 $
от 960
5-7 days
stock 8455 pcs
7 ChipWorker China All over the world
STM32F105RBT6
STM32F105RBT6
STMicroelectronics
02 Apr 2025 20:40
Микросхема Микроконтроллер, STMICROELECTRONICS STM32F105RBT6 32Bit ...
Next
1.74 $
2-5 days
stock 4115 pcs
8 AllElco Electronics China All over the world
STM32F105RCT7
STM32F105RCT7
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 64LQFP
1.74 $
от 960
5-7 days
stock 5349 pcs
STM32F105RBT6
STM32F105RBT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 64LQFP
1.77 $
от 320
5-7 days
stock 9760 pcs
STM32F105VBH6
STM32F105VBH6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 100BGA
1.81 $
от 552
5-7 days
stock 6021 pcs
STM32F105VBT6
STM32F105VBT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 100LQFP
1.81 $
от 450
5-7 days
stock 8437 pcs
STM32F105VCT6
STM32F105VCT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 100LQFP
1.83 $
от 990
5-7 days
stock 6584 pcs
STM32F105RCT6
STM32F105RCT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 64LQFP
1.85 $
от 480
5-7 days
stock 8455 pcs
STM32F105RBT6
STM32F105RBT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 64LQFP
1.85 $
от 160
5-7 days
stock 9760 pcs
STM32F105VCT7
STM32F105VCT7
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 100LQFP
1.95 $
от 990
5-7 days
stock 6195 pcs
STM32F105RCT7
STM32F105RCT7
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 64LQFP
1.98 $
от 480
5-7 days
stock 5349 pcs
STM32F105VBH6
STM32F105VBH6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 100BGA
1.98 $
от 368
5-7 days
stock 6021 pcs
STM32F105VBT6
STM32F105VBT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 100LQFP
1.98 $
от 270
5-7 days
stock 8437 pcs
STM32F105RCT6
STM32F105RCT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 64LQFP
2.03 $
от 320
5-7 days
stock 8455 pcs
STM32F105VCT6
STM32F105VCT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 100LQFP
2.08 $
от 450
5-7 days
stock 6584 pcs
STM32F105VBT6
STM32F105VBT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 100LQFP
2.08 $
от 90
5-7 days
stock 8437 pcs
STM32F105VBH6
STM32F105VBH6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 100BGA
2.08 $
от 184
5-7 days
stock 6021 pcs
STM32F105RCT6
STM32F105RCT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 64LQFP
2.13 $
от 160
5-7 days
stock 8455 pcs
STM32F105RBT6
STM32F105RBT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 64LQFP
2.13 $
от 25
5-7 days
stock 9760 pcs
25 ChipWorker China All over the world
STM32F105VCT6
STM32F105VCT6
STMicroelectronics
02 Apr 2025 20:40
Микросхема Микроконтроллер, STM32F105VCT6 MCU 32Bit STM32 ARM CORTEX ...
Next
2.16 $
2-5 days
stock 1666 pcs
26 AllElco Electronics China All over the world
STM32F105RCT7
STM32F105RCT7
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 64LQFP
2.17 $
от 320
5-7 days
stock 5349 pcs
STM32F105VCT7
STM32F105VCT7
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 100LQFP
2.22 $
от 450
5-7 days
stock 6195 pcs
STM32F105RBT6
STM32F105RBT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 64LQFP
2.24 $
от 10
5-7 days
stock 9760 pcs
STM32F105RCT7
STM32F105RCT7
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 64LQFP
2.28 $
от 160
5-7 days
stock 5349 pcs
STM32F105VCT6
STM32F105VCT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 100LQFP
2.28 $
от 270
5-7 days
stock 6584 pcs
2.38 $
от 90
5-7 days
stock 6584 pcs
STM32F105VBT6
STM32F105VBT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 100LQFP
2.39 $
от 25
5-7 days
stock 8437 pcs
STM32F105VBH6
STM32F105VBH6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 100BGA
2.39 $
от 25
5-7 days
stock 6021 pcs
STM32F105VCT7
STM32F105VCT7
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 100LQFP
2.44 $
от 270
5-7 days
stock 6195 pcs
STM32F105RCT6
STM32F105RCT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 64LQFP
2.45 $
от 25
5-7 days
stock 8455 pcs
STM32F105RBT6
STM32F105RBT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 64LQFP
2.48 $
от 1
5-7 days
stock 9760 pcs
STM32F105VBT6
STM32F105VBT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 100LQFP
2.51 $
от 10
5-7 days
stock 8437 pcs
STM32F105VBH6
STM32F105VBH6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 100BGA
2.51 $
от 10
5-7 days
stock 6021 pcs
STM32F105VCT7
STM32F105VCT7
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 100LQFP
2.55 $
от 90
5-7 days
stock 6195 pcs
STM32F105RCT6
STM32F105RCT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 64LQFP
2.57 $
от 10
5-7 days
stock 8455 pcs
STM32F105RCT7
STM32F105RCT7
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 64LQFP
2.62 $
от 25
5-7 days
stock 5349 pcs
STM32F105VCT6
STM32F105VCT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 100LQFP
2.74 $
от 25
5-7 days
stock 6584 pcs
STM32F105RCT7
STM32F105RCT7
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 64LQFP
2.75 $
от 10
5-7 days
stock 5349 pcs
STM32F105VBH6
STM32F105VBH6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 100BGA
2.78 $
от 1
5-7 days
stock 6021 pcs
STM32F105VBT6
STM32F105VBT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 128KB FLASH 100LQFP
2.78 $
от 1
5-7 days
stock 8437 pcs
STM32F105RCT6
STM32F105RCT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 64LQFP
2.84 $
от 1
5-7 days
stock 8455 pcs
STM32F105VCT6
STM32F105VCT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 100LQFP
2.88 $
от 10
5-7 days
stock 6584 pcs
STM32F105VCT7
STM32F105VCT7
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 100LQFP
2.94 $
от 25
5-7 days
stock 6195 pcs
STM32F105RCT7
STM32F105RCT7
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 64LQFP
3.04 $
от 1
5-7 days
stock 5349 pcs
STM32F105VCT7
STM32F105VCT7
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 100LQFP
3.08 $
от 10
5-7 days
stock 6195 pcs
STM32F105VCT6
STM32F105VCT6
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 100LQFP
3.19 $
от 1
5-7 days
stock 6584 pcs
52 EIS Components China All over the world
STM32F105RBT6
STMicroelectronics
15 Feb 2025 01:58
new in stock for immediate delivery
3.24 $
От 1 шт. Оплата рубли, юани,...
Next
5-7 days
stock 6641 pcs
53 ChipWorker China All over the world
STM32F105VBT6
STM32F105VBT6
STMicroelectronics
02 Apr 2025 20:40
Микросхема Микроконтроллер, MCU 32Bit ARM Cortex M3 RISC 128KB Flash 2 ...
Next
3.31 $
2-5 days
stock 188 pcs
54 AllElco Electronics China All over the world
STM32F105VCT7
STM32F105VCT7
STMicroelectronics
20 Apr 2025 14:19
IC MCU 32BIT 256KB FLASH 100LQFP
3.41 $
от 1
5-7 days
stock 6195 pcs
55 EIS Components China All over the world
STM32F105VBT6
STMicroelectronics
15 Feb 2025 01:58
new in stock for immediate delivery
3.61 $
От 1 шт. Оплата рубли, юани,...
Next
5-7 days
stock 5458 pcs
STM32F105VBH6
STMicroelectronics
15 Feb 2025 01:58
new in stock for immediate delivery
3.61 $
От 1 шт. Оплата рубли, юани,...
Next
5-7 days
stock 5010 pcs
STM32F105RCT6
STMicroelectronics
15 Feb 2025 01:58
new in stock for immediate delivery
3.72 $
От 1 шт. Оплата рубли, юани,...
Next
5-7 days
stock 6525 pcs
58 AiPCBA China All over the world
STM32F105RBT6
STMicroelectronics
19 Feb 2025 00:41
3.88 $
2-7 days
stock 1323 pcs
59 EIS Components China All over the world
STM32F105VCT6
STMicroelectronics
15 Feb 2025 01:58
new in stock for immediate delivery
4.06 $
От 1 шт. Оплата рубли, юани,...
Next
5-7 days
stock 6506 pcs
STM32F105RCT7
STMicroelectronics
15 Feb 2025 01:58
new in stock for immediate delivery
4.27 $
От 1 шт. Оплата рубли, юани,...
Next
5-7 days
stock 5855 pcs
61 ChipWorker China All over the world
STM32F105RCT7
STM32F105RCT7
STMicroelectronics
02 Apr 2025 20:40
Микросхема Микроконтроллер, STMICROELECTRONICS STM32F105RCT7 32Bit ...
Next
4.32 $
2-5 days
stock 192 pcs
62 EIS Components China All over the world
STM32F105VCT7
STMicroelectronics
15 Feb 2025 01:58
new in stock for immediate delivery
4.67 $
От 1 шт. Оплата рубли, юани,...
Next
5-7 days
stock 7170 pcs
63 AiPCBA China All over the world
STM32F105RCT6
STMicroelectronics
19 Feb 2025 00:41
5.04 $
2-7 days
stock 519 pcs
STM32F105RCT7
STMicroelectronics
19 Feb 2025 00:41
5.10 $
2-7 days
stock 274 pcs
STM32F105VCT6
STMicroelectronics
19 Feb 2025 00:41
5.10 $
2-7 days
stock 2067 pcs
66 ChipWorker China All over the world
STM32F105VBH6
STM32F105VBH6
STMicroelectronics
02 Apr 2025 20:40
Микросхема Микроконтроллер, MCU 32Bit ARM Cortex M3 RISC 128KB Flash 2 ...
Next
5.19 $
2-5 days
stock 106 pcs
67 AiPCBA China All over the world
STM32F105VBH6
STMicroelectronics
19 Feb 2025 00:41
5.87 $
2-7 days
stock 213 pcs
68 Lixinc Electronics China All over the world
STM32F105R8
STM32F105R8
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 64KB FLASH 64LQFP
5.90 $
от 10 шт
7 дней
12944 шт
STM32F105VBT6
STM32F105VBT6
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 128KB FLASH 100LQFP
6.39 $
от 90 шт
7 дней
10917 шт
STM32F105R8
STM32F105R8
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 64KB FLASH 64LQFP
6.52 $
от 1 шт
7 дней
12944 шт
STM32F105RBT6
STM32F105RBT6
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 128KB FLASH 64LQFP
6.75 $
от 10 шт
7 дней
9455 шт
STM32F105VBH6
STM32F105VBH6
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 128KB FLASH 100BGA
6.76 $
от 10 шт
7 дней
13245 шт
STM32F105RCT6
STM32F105RCT6
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 256KB FLASH 64LQFP
6.96 $
от 10 шт
7 дней
11957 шт
STM32F105RBT6
STM32F105RBT6
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 128KB FLASH 64LQFP
7.41 $
от 1 шт
7 дней
9455 шт
STM32F105RCT7
STM32F105RCT7
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 256KB FLASH 64LQFP
7.43 $
от 10 шт
7 дней
13356 шт
STM32F105VBH6
STM32F105VBH6
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 128KB FLASH 100BGA
7.43 $
от 1 шт
7 дней
13245 шт
STM32F105VBT6
STM32F105VBT6
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 128KB FLASH 100LQFP
7.43 $
от 1 шт
7 дней
10917 шт
STM32F105VCT
STM32F105VCT
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 256KB FLASH 100LQFP
7.47 $
от 90 шт
7 дней
13076 шт
STM32F105VCT6
STM32F105VCT6
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 256KB FLASH 100LQFP
7.47 $
от 90 шт
7 дней
18908 шт
STM32F105VC
STM32F105VC
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 256KB FLASH 100LQFP
7.47 $
от 90 шт
7 дней
8412 шт
STM32F105RCT6
STM32F105RCT6
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 256KB FLASH 64LQFP
7.71 $
от 1 шт
7 дней
11957 шт
STM32F105VCT7
STM32F105VCT7
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 256KB FLASH 100LQFP
7.87 $
от 90 шт
7 дней
12514 шт
STM32F105RCT7
STM32F105RCT7
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 256KB FLASH 64LQFP
8.15 $
от 1 шт
7 дней
13356 шт
STM32F105VC
STM32F105VC
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 256KB FLASH 100LQFP
8.68 $
от 1 шт
7 дней
8412 шт
STM32F105VCT
STM32F105VCT
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 256KB FLASH 100LQFP
8.68 $
от 1 шт
7 дней
13076 шт
STM32F105VCT6
STM32F105VCT6
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 256KB FLASH 100LQFP
8.68 $
от 1 шт
7 дней
18908 шт
87 AiPCBA China All over the world
STM32F105VBT6
STMicroelectronics
19 Feb 2025 00:41
9.03 $
2-7 days
stock 246 pcs
88 Lixinc Electronics China All over the world
STM32F105VCT7
STM32F105VCT7
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 256KB FLASH 100LQFP
9.14 $
от 1 шт
7 дней
12514 шт
89 ChipWorker China All over the world
STM32F105VCT7
STM32F105VCT7
STMicroelectronics
02 Apr 2025 20:40
Микросхема Микроконтроллер, MCU 32Bit ARM Cortex M3 RISC 256KB Flash 2 ...
Next
9.75 $
2-5 days
stock 134 pcs
90 Lixinc Electronics China All over the world
STM32F105RET6
STM32F105RET6
STMicroelectronics
18 Mar 2025 19:47
IC MCU 32BIT 1MB FLASH 144LQFP
12.8 $
от 60 шт
7 дней
8009 шт
14.6 $
от 1 шт
7 дней
8009 шт
92 AiPCBA China All over the world
STM32F105VCT7
STMicroelectronics
19 Feb 2025 00:41
93.1 $
2-7 days
stock 1310 pcs
93 ChipWorker China All over the world
STM32F105/107
STMicroelectronics
02 Apr 2025 20:40
Микросхема Микроконтроллер, 105/107 series development kit
119 $
2-5 days
stock 137 pcs
94 AiPCBA China All over the world
STM32F105/107
STMicroelectronics
19 Feb 2025 00:41
175 $
2-7 days
stock 2 pcs
95 ChipWorker China All over the world
USB-USBD-STM105-P-P1-S INGLE
USB-USBD-STM105-P-P1-S INGLE
Micrium -
02 Apr 2025 20:40
, UC/USB DEVICE, FOR STM32F105XX Software Application: Stacks - USB ...
Next
4 508 $
2-5 days
stock 148 pcs
KRN-K2XX-STM105-P-P1-S INGLE
KRN-K2XX-STM105-P-P1-S INGLE
Micrium -
02 Apr 2025 20:40
, RTOS, UC/OS-II, FOR STM32F105XX; Core Architecture: ARM; Core Sub- ...
Next
7 684 $
2-5 days
stock 132 pcs
KRN-K3XX-STM105-P-P1-S INGLE
KRN-K3XX-STM105-P-P1-S INGLE
Micrium -
02 Apr 2025 20:40
, RTOS, UC/OS-III, FOR STM32F105XX; Core Architecture: ARM; Core Sub- ...
Next
7 684 $
2-5 days
stock 143 pcs
USB-USBD-STM105-P-P1-P RODLINE
USB-USBD-STM105-P-P1-P RODLINE
Micrium -
02 Apr 2025 20:40
, UC/USB DEVICE, FOR STM32F105XX Software Application: Stacks - USB ...
Next
22 540 $
2-5 days
stock 188 pcs
USB-USBD-STM105-P-P1-P LATFORM
USB-USBD-STM105-P-P1-P LATFORM
Micrium -
02 Apr 2025 20:40
, UC/USB DEVICE, FOR STM32F105XX Software Application: Stacks - USB ...
Next
29 301 $
2-5 days
stock 134 pcs
KRN-K2XX-STM105-P-P1-P RODLINE
KRN-K2XX-STM105-P-P1-P RODLINE
Micrium -
02 Apr 2025 20:40
, RTOS, UC/OS-II, FOR STM32F105XX; Core Architecture: ARM; Core Sub- ...
Next
38 420 $
2-5 days
stock 135 pcs
KRN-K3XX-STM105-P-P1-P RODLINE
KRN-K3XX-STM105-P-P1-P RODLINE
Micrium -
02 Apr 2025 20:40
, RTOS, UC/OS-III, FOR STM32F105XX; Core Architecture: ARM; Core Sub- ...
Next
38 420 $
2-5 days
stock 130 pcs
KRN-K3XX-STM105-P-P1-P LATFORM
KRN-K3XX-STM105-P-P1-P LATFORM
Micrium -
02 Apr 2025 20:40
, RTOS, UC/OS-III, FOR STM32F105XX; Core Architecture: ARM; Core Sub- ...
Next
49 946 $
2-5 days
stock 154 pcs
KRN-K2XX-STM105-P-P1-P LATFORM
KRN-K2XX-STM105-P-P1-P LATFORM
Micrium -
02 Apr 2025 20:40
, RTOS, UC/OS-II, FOR STM32F105XX; Core Architecture: ARM; Core Sub- ...
Next
49 946 $
2-5 days
stock 120 pcs
104 AllElco Electronics China All over the world
STM32F105VCT6, 32
STMicroelectronics
20 Apr 2025 14:19
запрос
5-7 days
stock 8830 pcs
STM32F105RBT6, 32
STMicroelectronics
20 Apr 2025 14:19
запрос
5-7 days
stock 10250 pcs
STM32F105VC
STMicroelectronics
20 Apr 2025 14:19
запрос
5-7 days
stock 10760 pcs
STM32F105VCT
STMicroelectronics
20 Apr 2025 14:19
запрос
5-7 days
stock 13750 pcs
STM32F105RBT7
20 Apr 2025 14:19
запрос
5-7 days
stock 16039 pcs
Recommended Subsections