页 11 - 二极管 - 可变电容（变容器，可变电抗器） | 分立半导体产品 | 黑森尔电子
联系我们
SalesDept@heisener.com +86-755-83210559 ext. 807
登入/注册
BOM
购物车 0

二极管 - 可变电容（变容器，可变电抗器）

记录 554
页  11/19
图片
零件编号
制造商
描述
封装
库存
数量
Capacitance Ratio
Capacitance Ratio Condition
Voltage - Peak Reverse (Max)
Diode Type
Q @ Vr, F
Operating Temperature
Mounting Type
Package / Case
Supplier Device Package
BB 659C-02V H7902
Infineon Technologies

DIODE VAR CAP 30V 20MA SC79

  • Capacitance @ Vr, F: 2.75pF @ 28V, 1MHz
  • Capacitance Ratio: 15.3
  • Capacitance Ratio Condition: C1/C28
  • Voltage - Peak Reverse (Max): 30V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: -55°C ~ 150°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-79, SOD-523
  • Supplier Device Package: PG-SC79-2
封装: SC-79, SOD-523
库存3,440
15.3
C1/C28
30V
Single
-
-55°C ~ 150°C (TJ)
Surface Mount
SC-79, SOD-523
PG-SC79-2
BB659C02VH7908XTSA1
Infineon Technologies

DIODE VAR CAP 30V 20MA SC79

  • Capacitance @ Vr, F: 2.75pF @ 28V, 1MHz
  • Capacitance Ratio: 15.3
  • Capacitance Ratio Condition: C1/C28
  • Voltage - Peak Reverse (Max): 30V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: -55°C ~ 150°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-79, SOD-523
  • Supplier Device Package: PG-SC79-2
封装: SC-79, SOD-523
库存2,352
15.3
C1/C28
30V
Single
-
-55°C ~ 150°C (TJ)
Surface Mount
SC-79, SOD-523
PG-SC79-2
BB659H7902XTSA1
Infineon Technologies

DIODE VAR CAP 30V 20MA SCD80

  • Capacitance @ Vr, F: 2.9pF @ 28V, 1MHz
  • Capacitance Ratio: 14.7
  • Capacitance Ratio Condition: C1/C28
  • Voltage - Peak Reverse (Max): 30V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: -55°C ~ 150°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-80
  • Supplier Device Package: PG-SCD80-2
封装: SC-80
库存7,024
14.7
C1/C28
30V
Single
-
-55°C ~ 150°C (TJ)
Surface Mount
SC-80
PG-SCD80-2
BB 659C-02V E7912
Infineon Technologies

DIODE VARIABLE 30V 20MA SC-79

  • Capacitance @ Vr, F: 2.75pF @ 28V, 1MHz
  • Capacitance Ratio: 15.3
  • Capacitance Ratio Condition: C1/C28
  • Voltage - Peak Reverse (Max): 30V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: -55°C ~ 150°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-79, SOD-523
  • Supplier Device Package: PG-SC79-2
封装: SC-79, SOD-523
库存4,464
15.3
C1/C28
30V
Single
-
-55°C ~ 150°C (TJ)
Surface Mount
SC-79, SOD-523
PG-SC79-2
BBY 53-03LRH E6327
Infineon Technologies

DIODE TUNING 6V 20MA TSLP-3

  • Capacitance @ Vr, F: 3.1pF @ 3V, 1MHz
  • Capacitance Ratio: 2.6
  • Capacitance Ratio Condition: C1/C3
  • Voltage - Peak Reverse (Max): 6V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: -55°C ~ 125°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-101, SOT-883
  • Supplier Device Package: PG-TSLP-3
封装: SC-101, SOT-883
库存5,440
2.6
C1/C3
6V
Single
-
-55°C ~ 125°C (TJ)
Surface Mount
SC-101, SOT-883
PG-TSLP-3
BBY5103WE6327HTSA1
Infineon Technologies

DIODE TUNING 7V 20MA SOD-323

  • Capacitance @ Vr, F: 3.7pF @ 4V, 1MHz
  • Capacitance Ratio: 2.2
  • Capacitance Ratio Condition: C1/C4
  • Voltage - Peak Reverse (Max): 7V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: -55°C ~ 125°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-76, SOD-323
  • Supplier Device Package: PG-SOD323-2
封装: SC-76, SOD-323
库存2,448
2.2
C1/C4
7V
Single
-
-55°C ~ 125°C (TJ)
Surface Mount
SC-76, SOD-323
PG-SOD323-2
hot MMBV809LT3G
ON Semiconductor

DIODE TUNING SS 20V SOT-23

  • Capacitance @ Vr, F: 6.1pF @ 2V, 1MHz
  • Capacitance Ratio: 2.6
  • Capacitance Ratio Condition: C2/C8
  • Voltage - Peak Reverse (Max): 20V
  • Diode Type: Single
  • Q @ Vr, F: 75 @ 3V, 500MHz
  • Operating Temperature: 125°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: TO-236-3, SC-59, SOT-23-3
  • Supplier Device Package: SOT-23-3 (TO-236)
封装: TO-236-3, SC-59, SOT-23-3
库存310,032
2.6
C2/C8
20V
Single
75 @ 3V, 500MHz
125°C (TJ)
Surface Mount
TO-236-3, SC-59, SOT-23-3
SOT-23-3 (TO-236)
ZMV835BTC
Diodes Incorporated

DIODE VARACTOR 25V SOD323

  • Capacitance @ Vr, F: 71.4pF @ 2V, 1MHz
  • Capacitance Ratio: 6.5
  • Capacitance Ratio Condition: C2/C20
  • Voltage - Peak Reverse (Max): 25V
  • Diode Type: Single
  • Q @ Vr, F: 100 @ 3V, 50MHz
  • Operating Temperature: -55°C ~ 150°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-76, SOD-323
  • Supplier Device Package: SOD-323
封装: SC-76, SOD-323
库存5,184
6.5
C2/C20
25V
Single
100 @ 3V, 50MHz
-55°C ~ 150°C (TJ)
Surface Mount
SC-76, SOD-323
SOD-323
ZC932TC
Diodes Incorporated

DIODE VAR CAPACITANCE SOT23-3

  • Capacitance @ Vr, F: 5.5pF @ 4V, 50MHz
  • Capacitance Ratio: -
  • Capacitance Ratio Condition: -
  • Voltage - Peak Reverse (Max): 12V
  • Diode Type: Single
  • Q @ Vr, F: 200 @ 4V, 50MHz
  • Operating Temperature: -
  • Mounting Type: Surface Mount
  • Package / Case: TO-236-3, SC-59, SOT-23-3
  • Supplier Device Package: SOT-23-3
封装: TO-236-3, SC-59, SOT-23-3
库存3,344
-
-
12V
Single
200 @ 4V, 50MHz
-
Surface Mount
TO-236-3, SC-59, SOT-23-3
SOT-23-3
ZC833BNTC
Diodes Incorporated

DIODE VARIABLE CAP SOT23-3

  • Capacitance @ Vr, F: 34.65pF @ 2V, 1MHz
  • Capacitance Ratio: 6.5
  • Capacitance Ratio Condition: C2/C20
  • Voltage - Peak Reverse (Max): 25V
  • Diode Type: Single
  • Q @ Vr, F: 200 @ 3V, 50MHz
  • Operating Temperature: -55°C ~ 150°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: TO-236-3, SC-59, SOT-23-3
  • Supplier Device Package: SOT-23-3
封装: TO-236-3, SC-59, SOT-23-3
库存6,736
6.5
C2/C20
25V
Single
200 @ 3V, 50MHz
-55°C ~ 150°C (TJ)
Surface Mount
TO-236-3, SC-59, SOT-23-3
SOT-23-3
ZC829BTC
Diodes Incorporated

DIODE VAR CAPACITANCE SOT23-3

  • Capacitance @ Vr, F: 8.61pF @ 2V, 1MHz
  • Capacitance Ratio: 5.8
  • Capacitance Ratio Condition: C2/C20
  • Voltage - Peak Reverse (Max): 25V
  • Diode Type: Single
  • Q @ Vr, F: 250 @ 3V, 50MHz
  • Operating Temperature: -55°C ~ 150°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: TO-236-3, SC-59, SOT-23-3
  • Supplier Device Package: SOT-23-3
封装: TO-236-3, SC-59, SOT-23-3
库存4,192
5.8
C2/C20
25V
Single
250 @ 3V, 50MHz
-55°C ~ 150°C (TJ)
Surface Mount
TO-236-3, SC-59, SOT-23-3
SOT-23-3
hot FSD270TA
Diodes Incorporated

DIODE VARIABLE CAP CC SOT23-3

  • Capacitance @ Vr, F: 36.3pF @ 2V, 1MHz
  • Capacitance Ratio: 6.5
  • Capacitance Ratio Condition: C2/C20
  • Voltage - Peak Reverse (Max): 25V
  • Diode Type: 1 Pair Common Cathode
  • Q @ Vr, F: 200 @ 3V, 50MHz
  • Operating Temperature: -55°C ~ 150°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: TO-236-3, SC-59, SOT-23-3
  • Supplier Device Package: SOT-23-3
封装: TO-236-3, SC-59, SOT-23-3
库存144,396
6.5
C2/C20
25V
1 Pair Common Cathode
200 @ 3V, 50MHz
-55°C ~ 150°C (TJ)
Surface Mount
TO-236-3, SC-59, SOT-23-3
SOT-23-3
MV104
ON Semiconductor

DIODE TUNING FM DUAL 32V TO92

  • Capacitance @ Vr, F: 42pF @ 3V, 1MHz
  • Capacitance Ratio: 2.8
  • Capacitance Ratio Condition: C3/C30
  • Voltage - Peak Reverse (Max): 32V
  • Diode Type: 1 Pair Common Cathode
  • Q @ Vr, F: 140 @ 3V, 100MHz
  • Operating Temperature: 125°C (TJ)
  • Mounting Type: Through Hole
  • Package / Case: TO-226-3, TO-92-3 (TO-226AA)
  • Supplier Device Package: TO-92-3
封装: TO-226-3, TO-92-3 (TO-226AA)
库存2,896
2.8
C3/C30
32V
1 Pair Common Cathode
140 @ 3V, 100MHz
125°C (TJ)
Through Hole
TO-226-3, TO-92-3 (TO-226AA)
TO-92-3
ZDC833ATC
Diodes Incorporated

DIODE VAR CAP DUAL 33PF SOT23-3

  • Capacitance @ Vr, F: 36.3pF @ 2V, 1MHz
  • Capacitance Ratio: 6.5
  • Capacitance Ratio Condition: C2/C20
  • Voltage - Peak Reverse (Max): 25V
  • Diode Type: 1 Pair Common Cathode
  • Q @ Vr, F: 200 @ 3V, 50MHz
  • Operating Temperature: -55°C ~ 150°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: TO-236-3, SC-59, SOT-23-3
  • Supplier Device Package: SOT-23-3
封装: TO-236-3, SC-59, SOT-23-3
库存7,120
6.5
C2/C20
25V
1 Pair Common Cathode
200 @ 3V, 50MHz
-55°C ~ 150°C (TJ)
Surface Mount
TO-236-3, SC-59, SOT-23-3
SOT-23-3
BB178,335
NXP

DIODE VHF VAR CAP 32V SOD523

  • Capacitance @ Vr, F: 2.754pF @ 28V, 1MHz
  • Capacitance Ratio: 15
  • Capacitance Ratio Condition: C1/C28
  • Voltage - Peak Reverse (Max): 32V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: -55°C ~ 125°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-79, SOD-523
  • Supplier Device Package: SOD-523
封装: SC-79, SOD-523
库存3,280
15
C1/C28
32V
Single
-
-55°C ~ 125°C (TJ)
Surface Mount
SC-79, SOD-523
SOD-523
MA2SV1500L
Panasonic Electronic Components

DIODE VARIABLE CAP 6V SSMINI-2P

  • Capacitance @ Vr, F: 3.23pF @ 2.5V, 1MHz
  • Capacitance Ratio: 2.55
  • Capacitance Ratio Condition: C0.5/C2.5
  • Voltage - Peak Reverse (Max): 6V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: 150°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-80
  • Supplier Device Package: SSMini2-F2
封装: SC-80
库存6,832
2.55
C0.5/C2.5
6V
Single
-
150°C (TJ)
Surface Mount
SC-80
SSMini2-F2
ZC930TC
Diodes Incorporated

DIODE VAR CAPACITANCE SOT23-3

  • Capacitance @ Vr, F: 2.9pF @ 4V, 50MHz
  • Capacitance Ratio: -
  • Capacitance Ratio Condition: -
  • Voltage - Peak Reverse (Max): 12V
  • Diode Type: Single
  • Q @ Vr, F: 200 @ 4V, 50MHz
  • Operating Temperature: -
  • Mounting Type: Surface Mount
  • Package / Case: TO-236-3, SC-59, SOT-23-3
  • Supplier Device Package: SOT-23-3
封装: TO-236-3, SC-59, SOT-23-3
库存6,432
-
-
12V
Single
200 @ 4V, 50MHz
-
Surface Mount
TO-236-3, SC-59, SOT-23-3
SOT-23-3
ZC934TC
Diodes Incorporated

DIODE VARACTOR 12V 100MA SOT23-3

  • Capacitance @ Vr, F: 25pF @ 4V, 50MHz
  • Capacitance Ratio: -
  • Capacitance Ratio Condition: -
  • Voltage - Peak Reverse (Max): 12V
  • Diode Type: Single
  • Q @ Vr, F: 80 @ 4V, 50MHz
  • Operating Temperature: -
  • Mounting Type: Surface Mount
  • Package / Case: TO-236-3, SC-59, SOT-23-3
  • Supplier Device Package: SOT-23-3
封装: TO-236-3, SC-59, SOT-23-3
库存3,360
-
-
12V
Single
80 @ 4V, 50MHz
-
Surface Mount
TO-236-3, SC-59, SOT-23-3
SOT-23-3
hot SMV1253-040LF
Skyworks Solutions Inc.

DIODE VARACTOR

  • Capacitance @ Vr, F: 4.8pF @ 4.7V, 50MHz
  • Capacitance Ratio: 12.3
  • Capacitance Ratio Condition: C0.3/C4.7
  • Voltage - Peak Reverse (Max): 15V
  • Diode Type: Single
  • Q @ Vr, F: 350 @ 3V, 50MHz
  • Operating Temperature: -55°C ~ 125°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: 0402 (1006 Metric)
  • Supplier Device Package: 0402
封装: 0402 (1006 Metric)
库存360,000
12.3
C0.3/C4.7
15V
Single
350 @ 3V, 50MHz
-55°C ~ 125°C (TJ)
Surface Mount
0402 (1006 Metric)
0402
MA27V2200L
Panasonic Electronic Components

DIODE VARIABLE CAP 6V SSSMINI-2P

  • Capacitance @ Vr, F: 7.6pF @ 4V, 1MHz
  • Capacitance Ratio: 2.62
  • Capacitance Ratio Condition: C1/C4
  • Voltage - Peak Reverse (Max): 6V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: 125°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: 2-SMD, Flat Lead
  • Supplier Device Package: SSSMini2-F1
封装: 2-SMD, Flat Lead
库存99,282
2.62
C1/C4
6V
Single
-
125°C (TJ)
Surface Mount
2-SMD, Flat Lead
SSSMini2-F1
BB55502VH7912XTSA1
Infineon Technologies

DIODE VAR CAP 30V 20MA SC79

  • Capacitance @ Vr, F: 2.3pF @ 28V, 1MHz
  • Capacitance Ratio: 9.8
  • Capacitance Ratio Condition: C1/C28
  • Voltage - Peak Reverse (Max): 30V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: -55°C ~ 150°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-79, SOD-523
  • Supplier Device Package: PG-SC79-2
封装: SC-79, SOD-523
库存280,410
9.8
C1/C28
30V
Single
-
-55°C ~ 150°C (TJ)
Surface Mount
SC-79, SOD-523
PG-SC79-2
hot SMV2204-040LF
Skyworks Solutions Inc.

DIODE VARACTOR

  • Capacitance @ Vr, F: -
  • Capacitance Ratio: -
  • Capacitance Ratio Condition: -
  • Voltage - Peak Reverse (Max): 22V
  • Diode Type: Single
  • Q @ Vr, F: 400 @ 4V, 50MHz
  • Operating Temperature: -55°C ~ 175°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: 0402 (1006 Metric)
  • Supplier Device Package: 0402
封装: 0402 (1006 Metric)
库存647,928
-
-
22V
Single
400 @ 4V, 50MHz
-55°C ~ 175°C (TJ)
Surface Mount
0402 (1006 Metric)
0402
BB131,115
NXP

DIODE VHF VAR CAP 30V SOD323

  • Capacitance @ Vr, F: 1.055pF @ 28V, 1MHz
  • Capacitance Ratio: 16
  • Capacitance Ratio Condition: C0.5/C28
  • Voltage - Peak Reverse (Max): 30V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: -55°C ~ 125°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-76, SOD-323
  • Supplier Device Package: SOD-323
封装: SC-76, SOD-323
库存24,084
16
C0.5/C28
30V
Single
-
-55°C ~ 125°C (TJ)
Surface Mount
SC-76, SOD-323
SOD-323
BB545E7904HTSA1
Infineon Technologies

DIODE VAR CAP 30V 20MA SOD-323

  • Capacitance @ Vr, F: 2.2pF @ 28V, 1MHz
  • Capacitance Ratio: 11
  • Capacitance Ratio Condition: C1/C28
  • Voltage - Peak Reverse (Max): 30V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: -55°C ~ 150°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-76, SOD-323
  • Supplier Device Package: PG-SOD323-2
封装: SC-76, SOD-323
库存172,056
11
C1/C28
30V
Single
-
-55°C ~ 150°C (TJ)
Surface Mount
SC-76, SOD-323
PG-SOD323-2
hot SMV1705-079LF
Skyworks Solutions Inc.

DIODE VARACTOR 12V 20MA SC79

  • Capacitance @ Vr, F: 6.6pF @ 4V, 1MHz
  • Capacitance Ratio: 3
  • Capacitance Ratio Condition: C1/C4
  • Voltage - Peak Reverse (Max): 12V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: -55°C ~ 125°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-79, SOD-523
  • Supplier Device Package: SC-79
封装: SC-79, SOD-523
库存318,360
3
C1/C4
12V
Single
-
-55°C ~ 125°C (TJ)
Surface Mount
SC-79, SOD-523
SC-79
1SV281(TPH3,F)
Toshiba Semiconductor and Storage

DIODE VCO V/UHF 10V ESC

  • Capacitance @ Vr, F: 8.7pF @ 4V, 1MHz
  • Capacitance Ratio: 2
  • Capacitance Ratio Condition: C1/C4
  • Voltage - Peak Reverse (Max): 10V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: 125°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-79, SOD-523
  • Supplier Device Package: ESC
封装: SC-79, SOD-523
库存155,106
2
C1/C4
10V
Single
-
125°C (TJ)
Surface Mount
SC-79, SOD-523
ESC
MA46H202-1056
M/A-Com Technology Solutions

DIODE VARACTOR DUAL GAAS

  • Capacitance @ Vr, F: 3.3pF @ 4V, 1MHz
  • Capacitance Ratio: 5.6
  • Capacitance Ratio Condition: C2/C20
  • Voltage - Peak Reverse (Max): 22V
  • Diode Type: Single
  • Q @ Vr, F: 2000 @ 4V, 50MHz
  • Operating Temperature: -65°C ~ 150°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: 2-SMD
  • Supplier Device Package: -
封装: 2-SMD
库存7,872
5.6
C2/C20
22V
Single
2000 @ 4V, 50MHz
-65°C ~ 150°C (TJ)
Surface Mount
2-SMD
-
hot SMV1233-079LF
Skyworks Solutions Inc.

DIODE VARACTOR 15V 20MA SC79

  • Capacitance @ Vr, F: 1.1pF @ 6V, 50MHz
  • Capacitance Ratio: 3.3
  • Capacitance Ratio Condition: C1/C6
  • Voltage - Peak Reverse (Max): 15V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: -55°C ~ 125°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-79, SOD-523
  • Supplier Device Package: SC-79
封装: SC-79, SOD-523
库存756,000
3.3
C1/C6
15V
Single
-
-55°C ~ 125°C (TJ)
Surface Mount
SC-79, SOD-523
SC-79
hot SMV1255-079LF
Skyworks Solutions Inc.

DIODE VARACTOR 15V 20MA SC-79

  • Capacitance @ Vr, F: 5.8pF @ 4.7V, 50MHz
  • Capacitance Ratio: 12.3
  • Capacitance Ratio Condition: C0.3/C4.7
  • Voltage - Peak Reverse (Max): 15V
  • Diode Type: Single
  • Q @ Vr, F: 350 @ 3V, 50MHz
  • Operating Temperature: -55°C ~ 125°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-79, SOD-523
  • Supplier Device Package: SC-79
封装: SC-79, SOD-523
库存1,626,060
12.3
C0.3/C4.7
15V
Single
350 @ 3V, 50MHz
-55°C ~ 125°C (TJ)
Surface Mount
SC-79, SOD-523
SC-79
1SV280,H3F
Toshiba Semiconductor and Storage

DIODE VARACTOR 15V ESC

  • Capacitance @ Vr, F: 2pF @ 10V, 1MHz
  • Capacitance Ratio: 2.4
  • Capacitance Ratio Condition: C2/C10
  • Voltage - Peak Reverse (Max): 15V
  • Diode Type: Single
  • Q @ Vr, F: -
  • Operating Temperature: 125°C (TJ)
  • Mounting Type: Surface Mount
  • Package / Case: SC-79, SOD-523
  • Supplier Device Package: ESC
封装: SC-79, SOD-523
库存570,888
2.4
C2/C10
15V
Single
-
125°C (TJ)
Surface Mount
SC-79, SOD-523
ESC