TRIACs | Zouser

Manufacturer

Reset

Series

Reset

Triac Type

Reset

Voltage - Off State

Reset

Current - On State (It (RMS)) (Max)

Reset

Voltage - Gate Trigger (Vgt) (Max)

Reset

Current - Non Rep. Surge 50, 60Hz (Itsm)

Reset

Current - Gate Trigger (Igt) (Max)

Reset

Current - Hold (Ih) (Max)

Reset

Configuration

Reset

Operating Temperature

Reset

Mounting Type

Reset

Package / Case

Reset

Supplier Device Package

Reset

Show Filters

Reset Filters

Apply Filters

CategorySemiconductors / Thyristors / TRIACs

Records 3,130

Page 38/105

Part Number	Manufacturer	Description	In Stock	Series	Triac Type	Voltage - Off State	Current - On State (It (RMS)) (Max)	Voltage - Gate Trigger (Vgt) (Max)	Current - Non Rep. Surge 50, 60Hz (Itsm)	Current - Gate Trigger (Igt) (Max)	Current - Hold (Ih) (Max)	Configuration	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package
L6008V6TP	Littelfuse	Thyristors - TRIACs TRIAC SENS GATE 600V 8A TO251	In Stock279 More on Order	Manufacturer: Littelfuse Inc.	Series: -	Triac Type: Logic - Sensitive Gate	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 8A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 65A, 85A	Current - Gate Trigger (Igt) (Max): 5mA	Current - Hold (Ih) (Max): 10mA	Configuration: Single	Operating Temperature: -40°C ~ 110°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-251-3 Short Leads, IPak, TO-251AA	Supplier Device Package: TO-251 (V-Pak/I-Pak)
Q8004D4TP	Littelfuse	Thyristors - TRIACs TRIAC 800V 4A TO252	In Stock662 More on Order	Manufacturer: Littelfuse Inc.	Series: -	Triac Type: Standard	Voltage - Off State: 800V	Current - On State (It (RMS)) (Max): 4A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 46A, 55A	Current - Gate Trigger (Igt) (Max): 25mA	Current - Hold (Ih) (Max): 30mA	Configuration: Single	Operating Temperature: -40°C ~ 125°C (TJ)	Mounting Type: Surface Mount	Package / Case: TO-252-3, DPak (2 Leads + Tab), SC-63	Supplier Device Package: TO-252, (D-Pak)
Q8004V4TP	Littelfuse	Thyristors - TRIACs TRIAC 800V 4A TO251	In Stock474 More on Order	Manufacturer: Littelfuse Inc.	Series: -	Triac Type: Standard	Voltage - Off State: 800V	Current - On State (It (RMS)) (Max): 4A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 46A, 55A	Current - Gate Trigger (Igt) (Max): 25mA	Current - Hold (Ih) (Max): 30mA	Configuration: Single	Operating Temperature: -40°C ~ 125°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-251-3 Short Leads, IPak, TO-251AA	Supplier Device Package: TO-251 (V-Pak/I-Pak)
QJ6006DH3TP	Littelfuse	Thyristors - TRIACs TRIAC ALT 6A 600V TO-252 D-PAK	In Stock460 More on Order	Manufacturer: Littelfuse Inc.	Series: QJxx06xHx	Triac Type: Alternistor - Snubberless	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 6A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 60A, 72A	Current - Gate Trigger (Igt) (Max): 10mA	Current - Hold (Ih) (Max): 25mA	Configuration: Single	Operating Temperature: -40°C ~ 150°C (TJ)	Mounting Type: Surface Mount	Package / Case: TO-252-3, DPak (2 Leads + Tab), SC-63	Supplier Device Package: TO-252, (D-Pak)
TMA104S-L	Sanken	Thyristors - TRIACs TRIAC 400V 10A TO-220F	In Stock380 More on Order	Manufacturer: Sanken	Series: -	Triac Type: Standard	Voltage - Off State: 400V	Current - On State (It (RMS)) (Max): 10A	Voltage - Gate Trigger (Vgt) (Max): 1.5V	Current - Non Rep. Surge 50, 60Hz (Itsm): 100A, 105A	Current - Gate Trigger (Igt) (Max): 30mA	Current - Hold (Ih) (Max): -	Configuration: Single	Operating Temperature: -40°C ~ 125°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-220-3	Supplier Device Package: TO-220F
MAC16CNG	Littelfuse	Thyristors - TRIACs TRIAC 800V 16A TO220AB	In Stock234 More on Order	Manufacturer: Littelfuse Inc.	Series: -	Triac Type: Standard	Voltage - Off State: 800V	Current - On State (It (RMS)) (Max): 16A	Voltage - Gate Trigger (Vgt) (Max): 1.5V	Current - Non Rep. Surge 50, 60Hz (Itsm): 150A @ 60Hz	Current - Gate Trigger (Igt) (Max): 35mA	Current - Hold (Ih) (Max): 50mA	Configuration: Single	Operating Temperature: -40°C ~ 125°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-220-3	Supplier Device Package: TO-220AB
MAC16HCNG	Littelfuse	Thyristors - TRIACs TRIAC 800V 16A TO220AB	In Stock347 More on Order	Manufacturer: Littelfuse Inc.	Series: -	Triac Type: Standard	Voltage - Off State: 800V	Current - On State (It (RMS)) (Max): 16A	Voltage - Gate Trigger (Vgt) (Max): 1.5V	Current - Non Rep. Surge 50, 60Hz (Itsm): 150A @ 60Hz	Current - Gate Trigger (Igt) (Max): 50mA	Current - Hold (Ih) (Max): 50mA	Configuration: Single	Operating Temperature: -40°C ~ 125°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-220-3	Supplier Device Package: TO-220AB
T610H-6T	STMicroelectronics	Thyristors - TRIACs TRIAC SENS GATE 600V 6A TO220AB	In Stock625 More on Order	Manufacturer: STMicroelectronics	Series: -	Triac Type: Logic - Sensitive Gate	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 6A	Voltage - Gate Trigger (Vgt) (Max): 1V	Current - Non Rep. Surge 50, 60Hz (Itsm): 60A, 63A	Current - Gate Trigger (Igt) (Max): 10mA	Current - Hold (Ih) (Max): 25mA	Configuration: Single	Operating Temperature: -40°C ~ 150°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-220-3	Supplier Device Package: TO-220AB
QJ6006VH4TP	Littelfuse	Thyristors - TRIACs TRIAC ALT 6A 600V TO-251 V-PAK	In Stock277 More on Order	Manufacturer: Littelfuse Inc.	Series: QJxx06xHx	Triac Type: Alternistor - Snubberless	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 6A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 60A, 72A	Current - Gate Trigger (Igt) (Max): 35mA	Current - Hold (Ih) (Max): 35mA	Configuration: Single	Operating Temperature: -40°C ~ 150°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-251-3 Short Leads, IPak, TO-251AA	Supplier Device Package: TO-251AA
QJ6008DH4TP	Littelfuse	Thyristors - TRIACs TRIAC ALT 8A 600V TO-252 D-PAK	In Stock332 More on Order	Manufacturer: Littelfuse Inc.	Series: QJxx08xHx	Triac Type: Alternistor - Snubberless	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 8A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 70A, 84A	Current - Gate Trigger (Igt) (Max): 35mA	Current - Hold (Ih) (Max): 35mA	Configuration: Single	Operating Temperature: -40°C ~ 150°C (TJ)	Mounting Type: Surface Mount	Package / Case: TO-252-3, DPak (2 Leads + Tab), SC-63	Supplier Device Package: TO-252, (D-Pak)
Q6008NH1LEDRP	Littelfuse	Thyristors - TRIACs TRIAC 600V 8A TO263	In Stock346 More on Order	Manufacturer: Littelfuse Inc.	Series: -	Triac Type: Alternistor - Snubberless	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 8A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 80A, 85A	Current - Gate Trigger (Igt) (Max): 10mA	Current - Hold (Ih) (Max): 6mA	Configuration: Single	Operating Temperature: -40°C ~ 110°C (TJ)	Mounting Type: Surface Mount	Package / Case: TO-263-3, D²Pak (2 Leads + Tab), TO-263AB	Supplier Device Package: TO-263AB (D²PAK)
Q6008NH1LEDTP	Littelfuse	Thyristors - TRIACs TRIAC 600V 8A TO263	In Stock527 More on Order	Manufacturer: Littelfuse Inc.	Series: -	Triac Type: Alternistor - Snubberless	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 8A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 80A, 85A	Current - Gate Trigger (Igt) (Max): 10mA	Current - Hold (Ih) (Max): 6mA	Configuration: Single	Operating Temperature: -40°C ~ 110°C (TJ)	Mounting Type: Surface Mount	Package / Case: TO-263-3, D²Pak (2 Leads + Tab), TO-263AB	Supplier Device Package: TO-263AB (D²PAK)
QJ6006VH3TP	Littelfuse	Thyristors - TRIACs TRIAC ALT 6A 600V TO-251 V-PAK	In Stock346 More on Order	Manufacturer: Littelfuse Inc.	Series: QJxx06xHx	Triac Type: Alternistor - Snubberless	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 6A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 60A, 72A	Current - Gate Trigger (Igt) (Max): 10mA	Current - Hold (Ih) (Max): 25mA	Configuration: Single	Operating Temperature: -40°C ~ 150°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-251-3 Short Leads, IPak, TO-251AA	Supplier Device Package: TO-251AA
QJ6008DH3TP	Littelfuse	Thyristors - TRIACs TRIAC ALT 8A 600V TO-252 D-PAK	In Stock516 More on Order	Manufacturer: Littelfuse Inc.	Series: QJxx08xHx	Triac Type: Alternistor - Snubberless	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 8A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 70A, 84A	Current - Gate Trigger (Igt) (Max): 10mA	Current - Hold (Ih) (Max): 25mA	Configuration: Single	Operating Temperature: -40°C ~ 150°C (TJ)	Mounting Type: Surface Mount	Package / Case: TO-252-3, DPak (2 Leads + Tab), SC-63	Supplier Device Package: TO-252, (D-Pak)
QK004V4TP	Littelfuse	Thyristors - TRIACs TRIAC 1KV 4A TO251	In Stock155 More on Order	Manufacturer: Littelfuse Inc.	Series: -	Triac Type: Standard	Voltage - Off State: 1kV	Current - On State (It (RMS)) (Max): 4A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 46A, 55A	Current - Gate Trigger (Igt) (Max): 25mA	Current - Hold (Ih) (Max): 30mA	Configuration: Single	Operating Temperature: -40°C ~ 125°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-251-3 Short Leads, IPak, TO-251AA	Supplier Device Package: TO-251 (V-Pak/I-Pak)
T1050H-6I	STMicroelectronics	Thyristors - TRIACs TRIAC ALTERNISTOR 600V TO220AB	In Stock524 More on Order	Manufacturer: STMicroelectronics	Series: Snubberless™	Triac Type: Alternistor - Snubberless	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 10A	Voltage - Gate Trigger (Vgt) (Max): 1V	Current - Non Rep. Surge 50, 60Hz (Itsm): 100A, 105A	Current - Gate Trigger (Igt) (Max): 50mA	Current - Hold (Ih) (Max): 75mA	Configuration: Single	Operating Temperature: -40°C ~ 150°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-220-3	Supplier Device Package: TO-220AB
T435-600W	STMicroelectronics	Thyristors - TRIACs TRIAC ALTERNISTOR 600V ISOWATT	In Stock473 More on Order	Manufacturer: STMicroelectronics	Series: Snubberless™	Triac Type: Alternistor - Snubberless	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 4A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 30A, 31A	Current - Gate Trigger (Igt) (Max): 35mA	Current - Hold (Ih) (Max): 35mA	Configuration: Single	Operating Temperature: -40°C ~ 150°C (TJ)	Mounting Type: Through Hole	Package / Case: ISOWATT220AB-3	Supplier Device Package: ISOWATT220AB
LJ6008D8TP	Littelfuse	Thyristors - TRIACs TRIAC ALT 8A 600V TO-252 D-PAK	In Stock555 More on Order	Manufacturer: Littelfuse Inc.	Series: LJxx08xx	Triac Type: Logic - Sensitive Gate	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 8A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 70A, 84A	Current - Gate Trigger (Igt) (Max): 20mA	Current - Hold (Ih) (Max): 25mA	Configuration: Single	Operating Temperature: -40°C ~ 150°C (TJ)	Mounting Type: Surface Mount	Package / Case: TO-252-3, DPak (2 Leads + Tab), SC-63	Supplier Device Package: TO-252, (D-Pak)
LJ6008V8TP	Littelfuse	Thyristors - TRIACs TRIAC ALT 8A 600V TO-251 V-PAK	In Stock546 More on Order	Manufacturer: Littelfuse Inc.	Series: LJxx08xx	Triac Type: Logic - Sensitive Gate	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 8A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 70A, 84A	Current - Gate Trigger (Igt) (Max): 20mA	Current - Hold (Ih) (Max): 25mA	Configuration: Single	Operating Temperature: -40°C ~ 150°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-251-3 Short Leads, IPak, TO-251AA	Supplier Device Package: TO-251AA
MAC16CMG	Littelfuse	Thyristors - TRIACs TRIAC 600V 16A TO220AB	In Stock219 More on Order	Manufacturer: Littelfuse Inc.	Series: -	Triac Type: Standard	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 16A	Voltage - Gate Trigger (Vgt) (Max): 1.5V	Current - Non Rep. Surge 50, 60Hz (Itsm): 150A @ 60Hz	Current - Gate Trigger (Igt) (Max): 35mA	Current - Hold (Ih) (Max): 50mA	Configuration: Single	Operating Temperature: -40°C ~ 125°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-220-3	Supplier Device Package: TO-220AB
Q6012NH1LEDRP	Littelfuse	Thyristors - TRIACs TRIAC ALTERNISTOR 600V TO263AB	In Stock472 More on Order	Manufacturer: Littelfuse Inc.	Series: -	Triac Type: Alternistor - Snubberless	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 12A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 110A, 120A	Current - Gate Trigger (Igt) (Max): 10mA	Current - Hold (Ih) (Max): 8mA	Configuration: Single	Operating Temperature: -40°C ~ 110°C (TJ)	Mounting Type: Surface Mount	Package / Case: TO-263-3, D²Pak (2 Leads + Tab), TO-263AB	Supplier Device Package: TO-263AB (D²PAK)
Q6012NH1LEDTP	Littelfuse	Thyristors - TRIACs TRIAC ALTERNISTOR 600V TO263AB	In Stock433 More on Order	Manufacturer: Littelfuse Inc.	Series: -	Triac Type: Alternistor - Snubberless	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 12A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 110A, 120A	Current - Gate Trigger (Igt) (Max): 10mA	Current - Hold (Ih) (Max): 8mA	Configuration: Single	Operating Temperature: -40°C ~ 110°C (TJ)	Mounting Type: Surface Mount	Package / Case: TO-263-3, D²Pak (2 Leads + Tab), TO-263AB	Supplier Device Package: TO-263AB (D²PAK)
QJ6008VH4TP	Littelfuse	Thyristors - TRIACs TRIAC ALT 8A 600V TO-251 V-PAK	In Stock292 More on Order	Manufacturer: Littelfuse Inc.	Series: QJxx08xHx	Triac Type: Alternistor - Snubberless	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 8A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 70A, 84A	Current - Gate Trigger (Igt) (Max): 35mA	Current - Hold (Ih) (Max): 35mA	Configuration: Single	Operating Temperature: -40°C ~ 150°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-251-3 Short Leads, IPak, TO-251AA	Supplier Device Package: TO-251AA
MAC12HCMG	Littelfuse	Thyristors - TRIACs TRIAC 600V 12A TO220AB	In Stock326 More on Order	Manufacturer: Littelfuse Inc.	Series: -	Triac Type: Standard	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 12A	Voltage - Gate Trigger (Vgt) (Max): 1.5V	Current - Non Rep. Surge 50, 60Hz (Itsm): 100A @ 60Hz	Current - Gate Trigger (Igt) (Max): 50mA	Current - Hold (Ih) (Max): 60mA	Configuration: Single	Operating Temperature: -40°C ~ 125°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-220-3	Supplier Device Package: TO-220AB
MAC3030-8G	Littelfuse	Thyristors - TRIACs TRIAC 250V 8A TO220AB	In Stock377 More on Order	Manufacturer: Littelfuse Inc.	Series: -	Triac Type: Standard	Voltage - Off State: 250V	Current - On State (It (RMS)) (Max): 8A	Voltage - Gate Trigger (Vgt) (Max): 2V	Current - Non Rep. Surge 50, 60Hz (Itsm): 80A @ 60Hz	Current - Gate Trigger (Igt) (Max): 50mA	Current - Hold (Ih) (Max): 50mA	Configuration: Single	Operating Temperature: -40°C ~ 125°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-220-3	Supplier Device Package: TO-220AB
MAC212A10G	Littelfuse	Thyristors - TRIACs TRIAC 800V 12A TO220AB	In Stock524 More on Order	Manufacturer: Littelfuse Inc.	Series: -	Triac Type: Standard	Voltage - Off State: 800V	Current - On State (It (RMS)) (Max): 12A	Voltage - Gate Trigger (Vgt) (Max): 2V	Current - Non Rep. Surge 50, 60Hz (Itsm): 100A @ 60Hz	Current - Gate Trigger (Igt) (Max): 50mA	Current - Hold (Ih) (Max): 50mA	Configuration: Single	Operating Temperature: -40°C ~ 125°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-220-3	Supplier Device Package: TO-220AB
T1250H-6T	STMicroelectronics	Thyristors - TRIACs TRIAC ALTERNISTOR 600V TO220AB	In Stock537 More on Order	Manufacturer: STMicroelectronics	Series: Snubberless™	Triac Type: Alternistor - Snubberless	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 12A	Voltage - Gate Trigger (Vgt) (Max): 1V	Current - Non Rep. Surge 50, 60Hz (Itsm): 120A, 126A	Current - Gate Trigger (Igt) (Max): 50mA	Current - Hold (Ih) (Max): 75mA	Configuration: Single	Operating Temperature: -40°C ~ 150°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-220-3	Supplier Device Package: TO-220AB
Q4004R3TP	Littelfuse	Thyristors - TRIACs TRIAC 400V 4A 10 10 10 TO220 NON	In Stock371 More on Order	Manufacturer: Littelfuse Inc.	Series: *	Triac Type: -	Voltage - Off State: -	Current - On State (It (RMS)) (Max): -	Voltage - Gate Trigger (Vgt) (Max): -	Current - Non Rep. Surge 50, 60Hz (Itsm): -	Current - Gate Trigger (Igt) (Max): -	Current - Hold (Ih) (Max): -	Configuration: -	Operating Temperature: -	Mounting Type: -	Package / Case: -	Supplier Device Package: -
Q4004R4TP	Littelfuse	Thyristors - TRIACs TRIAC 400V 4A 25 25 25 TO220 NON	In Stock349 More on Order	Manufacturer: Littelfuse Inc.	Series: *	Triac Type: -	Voltage - Off State: -	Current - On State (It (RMS)) (Max): -	Voltage - Gate Trigger (Vgt) (Max): -	Current - Non Rep. Surge 50, 60Hz (Itsm): -	Current - Gate Trigger (Igt) (Max): -	Current - Hold (Ih) (Max): -	Configuration: -	Operating Temperature: -	Mounting Type: -	Package / Case: -	Supplier Device Package: -
QJ6008VH3TP	Littelfuse	Thyristors - TRIACs TRIAC ALT 8A 600V TO-251 V-PAK	In Stock241 More on Order	Manufacturer: Littelfuse Inc.	Series: QJxx08xHx	Triac Type: Alternistor - Snubberless	Voltage - Off State: 600V	Current - On State (It (RMS)) (Max): 8A	Voltage - Gate Trigger (Vgt) (Max): 1.3V	Current - Non Rep. Surge 50, 60Hz (Itsm): 70A, 84A	Current - Gate Trigger (Igt) (Max): 10mA	Current - Hold (Ih) (Max): 25mA	Configuration: Single	Operating Temperature: -40°C ~ 150°C (TJ)	Mounting Type: Through Hole	Package / Case: TO-251-3 Short Leads, IPak, TO-251AA	Supplier Device Package: TO-251AA