Página 19 - ON Semiconductor Productos - Lógica - Interruptores de señal, multiplexores, decodificadores | Heisener Electronics
Contáctenos
SalesDept@heisener.com +86-755-83210559 ext. 813
Language Translation

* Please refer to the English Version as our Official Version.

ON Semiconductor Productos - Lógica - Interruptores de señal, multiplexores, decodificadores

Registros 1.316
Página  19/47
Imagen
Nº de pieza
Fabricantes
Descripción
Paquete
En existencias
Cantidad
Circuit
Independent Circuits
Current - Output High, Low
Voltage Supply Source
Voltage - Supply
Operating Temperature
Mounting Type
Package / Case
Supplier Device Package
hot MM74HCT138MTCX
ON Semiconductor

IC DECODER 3-TO-8 LINE 16-TSSOP

  • Type: Decoder/Demultiplexer
  • Circuit: 1 x 3:8
  • Independent Circuits: 1
  • Current - Output High, Low: 4.8mA, 4.8mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 4.5 V ~ 5.5 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-TSSOP (0.173", 4.40mm Width)
  • Supplier Device Package: 16-TSSOP
Paquete: 16-TSSOP (0.173", 4.40mm Width)
En existencias16.860
1 x 3:8
1
4.8mA, 4.8mA
Single Supply
4.5 V ~ 5.5 V
-40°C ~ 85°C
Surface Mount
16-TSSOP (0.173", 4.40mm Width)
16-TSSOP
NC7SP19L6X
ON Semiconductor

IC DECODER/DEMUX ULP 1:2 6MCRPAK

  • Type: Decoder/Demultiplexer
  • Circuit: 1 x 1:2
  • Independent Circuits: 1
  • Current - Output High, Low: 2.6mA, 2.6mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 0.9 V ~ 3.6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 6-UFDFN
  • Supplier Device Package: 6-MicroPak
Paquete: 6-UFDFN
En existencias2.176
1 x 1:2
1
2.6mA, 2.6mA
Single Supply
0.9 V ~ 3.6 V
-40°C ~ 85°C
Surface Mount
6-UFDFN
6-MicroPak
hot 74LVX138MTCX
ON Semiconductor

DECODER/DEMUX 1-OF-8 LV 16TSSOP

  • Type: Decoder/Demultiplexer
  • Circuit: 1 x 3:8
  • Independent Circuits: 1
  • Current - Output High, Low: 4mA, 4mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 2 V ~ 3.6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-TSSOP (0.173", 4.40mm Width)
  • Supplier Device Package: 16-TSSOP
Paquete: 16-TSSOP (0.173", 4.40mm Width)
En existencias99.564
1 x 3:8
1
4mA, 4mA
Single Supply
2 V ~ 3.6 V
-40°C ~ 85°C
Surface Mount
16-TSSOP (0.173", 4.40mm Width)
16-TSSOP
hot 74VHC138MTCX
ON Semiconductor

DECODER/DEMUX 3-TO-8 16TSSOP

  • Type: Decoder/Demultiplexer
  • Circuit: 1 x 3:8
  • Independent Circuits: 1
  • Current - Output High, Low: 8mA, 8mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 2 V ~ 5.5 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-TSSOP (0.173", 4.40mm Width)
  • Supplier Device Package: 16-TSSOP
Paquete: 16-TSSOP (0.173", 4.40mm Width)
En existencias30.456
1 x 3:8
1
8mA, 8mA
Single Supply
2 V ~ 5.5 V
-40°C ~ 85°C
Surface Mount
16-TSSOP (0.173", 4.40mm Width)
16-TSSOP
NC7SP157L6X
ON Semiconductor

IC MUX ULP 2-INP NONINV 6-MCRPAK

  • Type: Multiplexer
  • Circuit: 1 x 2:1
  • Independent Circuits: 1
  • Current - Output High, Low: 2.6mA, 2.6mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 0.9 V ~ 3.6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 6-UFDFN
  • Supplier Device Package: 6-MicroPak
Paquete: 6-UFDFN
En existencias6.000
1 x 2:1
1
2.6mA, 2.6mA
Single Supply
0.9 V ~ 3.6 V
-40°C ~ 85°C
Surface Mount
6-UFDFN
6-MicroPak
NC7SV19L6X
ON Semiconductor

IC DECODER/DEMUX ULP-A 6MICROPAK

  • Type: Decoder/Demultiplexer
  • Circuit: 1 x 1:2
  • Independent Circuits: 1
  • Current - Output High, Low: 24mA, 24mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 0.9 V ~ 3.6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 6-UFDFN
  • Supplier Device Package: 6-MicroPak
Paquete: 6-UFDFN
En existencias7.504
1 x 1:2
1
24mA, 24mA
Single Supply
0.9 V ~ 3.6 V
-40°C ~ 85°C
Surface Mount
6-UFDFN
6-MicroPak
hot NC7SV157L6X
ON Semiconductor

IC MUX ULP-A 2INP NONINV 6MCRPAK

  • Type: Multiplexer
  • Circuit: 1 x 2:1
  • Independent Circuits: 1
  • Current - Output High, Low: 24mA, 24mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 0.9 V ~ 3.6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 6-UFDFN
  • Supplier Device Package: 6-MicroPak
Paquete: 6-UFDFN
En existencias23.292
1 x 2:1
1
24mA, 24mA
Single Supply
0.9 V ~ 3.6 V
-40°C ~ 85°C
Surface Mount
6-UFDFN
6-MicroPak
NC7SP19P6X
ON Semiconductor

IC DECODER/DEMUX ULP 1:2 SC70-6

  • Type: Decoder/Demultiplexer
  • Circuit: 1 x 1:2
  • Independent Circuits: 1
  • Current - Output High, Low: 2.6mA, 2.6mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 0.9 V ~ 3.6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 6-TSSOP, SC-88, SOT-363
  • Supplier Device Package: SC-70-6
Paquete: 6-TSSOP, SC-88, SOT-363
En existencias7.792
1 x 1:2
1
2.6mA, 2.6mA
Single Supply
0.9 V ~ 3.6 V
-40°C ~ 85°C
Surface Mount
6-TSSOP, SC-88, SOT-363
SC-70-6
NC7SP157P6X
ON Semiconductor

IC MUX ULP 2-INP NONINV SC70-5

  • Type: Multiplexer
  • Circuit: 1 x 2:1
  • Independent Circuits: 1
  • Current - Output High, Low: 2.6mA, 2.6mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 0.9 V ~ 3.6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 6-TSSOP, SC-88, SOT-363
  • Supplier Device Package: SC-70-6
Paquete: 6-TSSOP, SC-88, SOT-363
En existencias2.112
1 x 2:1
1
2.6mA, 2.6mA
Single Supply
0.9 V ~ 3.6 V
-40°C ~ 85°C
Surface Mount
6-TSSOP, SC-88, SOT-363
SC-70-6
hot NC7SZ19L6X
ON Semiconductor

IC DECODER/DEMUX UHS 1:2 6MCRPAK

  • Type: Decoder/Demultiplexer
  • Circuit: 1 x 1:2
  • Independent Circuits: 1
  • Current - Output High, Low: 32mA, 32mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 1.65 V ~ 5.5 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 6-UFDFN
  • Supplier Device Package: 6-MicroPak
Paquete: 6-UFDFN
En existencias180.000
1 x 1:2
1
32mA, 32mA
Single Supply
1.65 V ~ 5.5 V
-40°C ~ 85°C
Surface Mount
6-UFDFN
6-MicroPak
hot NC7SZ18L6X
ON Semiconductor

IC DEMUX UHS 1:2 NONINV 6-MCRPAK

  • Type: Demultiplexer
  • Circuit: 1 x 1:2
  • Independent Circuits: 1
  • Current - Output High, Low: 32mA, 32mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 1.65 V ~ 5.5 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 6-UFDFN
  • Supplier Device Package: 6-MicroPak
Paquete: 6-UFDFN
En existencias18.600
1 x 1:2
1
32mA, 32mA
Single Supply
1.65 V ~ 5.5 V
-40°C ~ 85°C
Surface Mount
6-UFDFN
6-MicroPak
hot NC7SV19P6X
ON Semiconductor

IC DECODER/DEMUX ULP-A SC70-6

  • Type: Decoder/Demultiplexer
  • Circuit: 1 x 1:2
  • Independent Circuits: 1
  • Current - Output High, Low: 24mA, 24mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 0.9 V ~ 3.6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 6-TSSOP, SC-88, SOT-363
  • Supplier Device Package: SC-70-6
Paquete: 6-TSSOP, SC-88, SOT-363
En existencias6.240
1 x 1:2
1
24mA, 24mA
Single Supply
0.9 V ~ 3.6 V
-40°C ~ 85°C
Surface Mount
6-TSSOP, SC-88, SOT-363
SC-70-6
hot 74AC139SCX
ON Semiconductor

IC DECODER/DEMUX 1-OF-4 16-SOIC

  • Type: Decoder/Demultiplexer
  • Circuit: 1 x 2:4
  • Independent Circuits: 2
  • Current - Output High, Low: 24mA, 24mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 2 V ~ 6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-SOIC (0.154", 3.90mm Width)
  • Supplier Device Package: 16-SOIC
Paquete: 16-SOIC (0.154", 3.90mm Width)
En existencias24.000
1 x 2:4
2
24mA, 24mA
Single Supply
2 V ~ 6 V
-40°C ~ 85°C
Surface Mount
16-SOIC (0.154", 3.90mm Width)
16-SOIC
hot 74ACT139SCX
ON Semiconductor

DECODER/DEMUX 1-OF-4 16SOIC

  • Type: Decoder/Demultiplexer
  • Circuit: 1 x 2:4
  • Independent Circuits: 2
  • Current - Output High, Low: 24mA, 24mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 4.5 V ~ 5.5 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-SOIC (0.154", 3.90mm Width)
  • Supplier Device Package: 16-SOIC
Paquete: 16-SOIC (0.154", 3.90mm Width)
En existencias17.760
1 x 2:4
2
24mA, 24mA
Single Supply
4.5 V ~ 5.5 V
-40°C ~ 85°C
Surface Mount
16-SOIC (0.154", 3.90mm Width)
16-SOIC
74AC139MTCX
ON Semiconductor

DECODER/DEMUX 1-OF-4 16TSSOP

  • Type: Decoder/Demultiplexer
  • Circuit: 1 x 2:4
  • Independent Circuits: 2
  • Current - Output High, Low: 24mA, 24mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 2 V ~ 6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-TSSOP (0.173", 4.40mm Width)
  • Supplier Device Package: 16-TSSOP
Paquete: 16-TSSOP (0.173", 4.40mm Width)
En existencias22.212
1 x 2:4
2
24mA, 24mA
Single Supply
2 V ~ 6 V
-40°C ~ 85°C
Surface Mount
16-TSSOP (0.173", 4.40mm Width)
16-TSSOP
hot 74LCX157MTC
ON Semiconductor

IC MUX LV QUAD 2INPUT 16-TSSOP

  • Type: Multiplexer
  • Circuit: 4 x 2:1
  • Independent Circuits: 1
  • Current - Output High, Low: 24mA, 24mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 2 V ~ 3.6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-TSSOP (0.173", 4.40mm Width)
  • Supplier Device Package: 16-TSSOP
Paquete: 16-TSSOP (0.173", 4.40mm Width)
En existencias10.452
4 x 2:1
1
24mA, 24mA
Single Supply
2 V ~ 3.6 V
-40°C ~ 85°C
Surface Mount
16-TSSOP (0.173", 4.40mm Width)
16-TSSOP
hot 74LVX157MTCX
ON Semiconductor

MULTIPLEXER QUAD 2IN LV 16TSSOP

  • Type: Multiplexer
  • Circuit: 4 x 2:1
  • Independent Circuits: 1
  • Current - Output High, Low: 4mA, 4mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 2 V ~ 3.6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-TSSOP (0.173", 4.40mm Width)
  • Supplier Device Package: 16-TSSOP
Paquete: 16-TSSOP (0.173", 4.40mm Width)
En existencias13.200
4 x 2:1
1
4mA, 4mA
Single Supply
2 V ~ 3.6 V
-40°C ~ 85°C
Surface Mount
16-TSSOP (0.173", 4.40mm Width)
16-TSSOP
NC7SZ18FHX
ON Semiconductor

IC DEMUX UHS 1:2 3ST 6-MICROPAK2

  • Type: Demultiplexer
  • Circuit: 1 x 1:2
  • Independent Circuits: 1
  • Current - Output High, Low: 32mA, 32mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 1.65 V ~ 5.5 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 6-UFDFN
  • Supplier Device Package: 6-MicroPak2™
Paquete: 6-UFDFN
En existencias223.338
1 x 1:2
1
32mA, 32mA
Single Supply
1.65 V ~ 5.5 V
-40°C ~ 85°C
Surface Mount
6-UFDFN
6-MicroPak2™
hot NC7SZ157L6X
ON Semiconductor

IC MUX UHS 2-INP NONINV 6-MCRPAK

  • Type: Multiplexer
  • Circuit: 1 x 2:1
  • Independent Circuits: 1
  • Current - Output High, Low: 32mA, 32mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 1.65 V ~ 5.5 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 6-UFDFN
  • Supplier Device Package: 6-MicroPak
Paquete: 6-UFDFN
En existencias79.992
1 x 2:1
1
32mA, 32mA
Single Supply
1.65 V ~ 5.5 V
-40°C ~ 85°C
Surface Mount
6-UFDFN
6-MicroPak
hot MM74HCT138M
ON Semiconductor

IC DECODER 3-TO-8 LINE 16-SOIC

  • Type: Decoder/Demultiplexer
  • Circuit: 1 x 3:8
  • Independent Circuits: 1
  • Current - Output High, Low: 4.8mA, 4.8mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 4.5 V ~ 5.5 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-SOIC (0.154", 3.90mm Width)
  • Supplier Device Package: 16-SOIC
Paquete: 16-SOIC (0.154", 3.90mm Width)
En existencias8.184
1 x 3:8
1
4.8mA, 4.8mA
Single Supply
4.5 V ~ 5.5 V
-40°C ~ 85°C
Surface Mount
16-SOIC (0.154", 3.90mm Width)
16-SOIC
74VHC138M
ON Semiconductor

IC DECODER/DEMUX 3-TO-8 16-SOIC

  • Type: Decoder/Demultiplexer
  • Circuit: 1 x 3:8
  • Independent Circuits: 1
  • Current - Output High, Low: 8mA, 8mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 2 V ~ 5.5 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-SOIC (0.154", 3.90mm Width)
  • Supplier Device Package: 16-SOIC
Paquete: 16-SOIC (0.154", 3.90mm Width)
En existencias30.600
1 x 3:8
1
8mA, 8mA
Single Supply
2 V ~ 5.5 V
-40°C ~ 85°C
Surface Mount
16-SOIC (0.154", 3.90mm Width)
16-SOIC
hot 74LCX138M
ON Semiconductor

DECODER/DEMUX 1OF8 5V 16-SOIC

  • Type: Decoder/Demultiplexer
  • Circuit: 1 x 3:8
  • Independent Circuits: 1
  • Current - Output High, Low: 24mA, 24mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 2 V ~ 3.6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-SOIC (0.154", 3.90mm Width)
  • Supplier Device Package: 16-SOIC
Paquete: 16-SOIC (0.154", 3.90mm Width)
En existencias9.768
1 x 3:8
1
24mA, 24mA
Single Supply
2 V ~ 3.6 V
-40°C ~ 85°C
Surface Mount
16-SOIC (0.154", 3.90mm Width)
16-SOIC
74LCX138BQX
ON Semiconductor

DECODER/DEMUX 1-OF-8 LV 16DQFN

  • Type: Decoder/Demultiplexer
  • Circuit: 1 x 3:8
  • Independent Circuits: 1
  • Current - Output High, Low: 24mA, 24mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 2 V ~ 3.6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-WFQFN Exposed Pad
  • Supplier Device Package: 16-DQFN (2.5x3.5)
Paquete: 16-WFQFN Exposed Pad
En existencias27.420
1 x 3:8
1
24mA, 24mA
Single Supply
2 V ~ 3.6 V
-40°C ~ 85°C
Surface Mount
16-WFQFN Exposed Pad
16-DQFN (2.5x3.5)
hot 74VHC157MTCX
ON Semiconductor

MULTIPLEXER QUAD 2IN 16TSSOP

  • Type: Multiplexer
  • Circuit: 4 x 2:1
  • Independent Circuits: 1
  • Current - Output High, Low: 8mA, 8mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 2 V ~ 5.5 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-TSSOP (0.173", 4.40mm Width)
  • Supplier Device Package: 16-TSSOP
Paquete: 16-TSSOP (0.173", 4.40mm Width)
En existencias12.696
4 x 2:1
1
8mA, 8mA
Single Supply
2 V ~ 5.5 V
-40°C ~ 85°C
Surface Mount
16-TSSOP (0.173", 4.40mm Width)
16-TSSOP
hot NC7WB3125K8X
ON Semiconductor

IC BUS SWITCH UHS 2BIT HS US8

  • Type: Bus Switch
  • Circuit: 1 x 1:1
  • Independent Circuits: 2
  • Current - Output High, Low: -
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 4 V ~ 5.5 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 8-VFSOP (0.091", 2.30mm Width)
  • Supplier Device Package: US8
Paquete: 8-VFSOP (0.091", 2.30mm Width)
En existencias2.000
1 x 1:1
2
-
Single Supply
4 V ~ 5.5 V
-40°C ~ 85°C
Surface Mount
8-VFSOP (0.091", 2.30mm Width)
US8
hot 74LCX157MTCX
ON Semiconductor

MULTIPLEXER QUAD 5V 2INP 16TSSOP

  • Type: Multiplexer
  • Circuit: 4 x 2:1
  • Independent Circuits: 1
  • Current - Output High, Low: 24mA, 24mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 2 V ~ 3.6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-TSSOP (0.173", 4.40mm Width)
  • Supplier Device Package: 16-TSSOP
Paquete: 16-TSSOP (0.173", 4.40mm Width)
En existencias30.000
4 x 2:1
1
24mA, 24mA
Single Supply
2 V ~ 3.6 V
-40°C ~ 85°C
Surface Mount
16-TSSOP (0.173", 4.40mm Width)
16-TSSOP
hot 74LCX257MTCX
ON Semiconductor

MULTIPLEXER QUAD 2IN I/O 16TSSOP

  • Type: Multiplexer
  • Circuit: 4 x 2:1
  • Independent Circuits: 1
  • Current - Output High, Low: 24mA, 24mA
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 2 V ~ 3.6 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-TSSOP (0.173", 4.40mm Width)
  • Supplier Device Package: 16-TSSOP
Paquete: 16-TSSOP (0.173", 4.40mm Width)
En existencias30.000
4 x 2:1
1
24mA, 24mA
Single Supply
2 V ~ 3.6 V
-40°C ~ 85°C
Surface Mount
16-TSSOP (0.173", 4.40mm Width)
16-TSSOP
hot FSTD16211MTDX
ON Semiconductor

IC SWITCH BUS 24BIT TTL 56TSSOP

  • Type: Bus Switch
  • Circuit: 12 x 1:1
  • Independent Circuits: 2
  • Current - Output High, Low: -
  • Voltage Supply Source: Single Supply
  • Voltage - Supply: 4.5 V ~ 5.5 V
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 56-TFSOP (0.240", 6.10mm Width)
  • Supplier Device Package: 56-TSSOP
Paquete: 56-TFSOP (0.240", 6.10mm Width)
En existencias32.400
12 x 1:1
2
-
Single Supply
4.5 V ~ 5.5 V
-40°C ~ 85°C
Surface Mount
56-TFSOP (0.240", 6.10mm Width)
56-TSSOP