Qxx12xHx Series - 12 Amp Alternistor (High Commutation) Triacs

12 Amp Alternistor (High Commutation) Triacs
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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

12Amp bi-directional solid state switch series is designed for AC switching and phase control applications such as motor speed and temperature modulation controls, lighting controls, and static switching relays.

Alternistor type devices only operate in quadrants I, II, & III and are used in circuits requiring high dv/dt capability.

Features & Benefits:

  • RoHS Compliant
  • Glass – passivated junctions
  • Voltage capability up to 1000 V
  • Surge capability up to 120 A
  • Electrically isolated “L-Package” is UL recognized for 2500Vrms
  • Solid-state switching eliminates arcing or contact bounce that create voltage transients
  • No contacts to wear out from reaction of switching events
  • Restricted (or limited) RFI generation, depending on activation point sine wave
  • Requires only a small gate activation pulse in each half-cycle 


  • Excellent for AC switching and phase control applications such as heating, lighting, and motor speed controls. Typical applications are AC solid-state switches, light dimmers, power tools, lawn care equipment, home/brown goods and white goods appliances.
  • Alternistor TRIACs (no snubber required) are used in applications with extremely inductive loads requiring highest commutation performance.
  • Internally constructed isolated packages are offered for ease of heat sinking with highest isolation voltage.

Access specifications, certifications, check availability and order parts below

Catalog #SizeIT(RMS) (A)VDRM (V)IDRM@
di/dt @
Q4012LH2TPTO-220 Isolated Tab124000.011010101.612070Through Hole RadialCheckOrder
Q4012LH5TPTO-220 Isolated Tab124000.015050501.612070Through Hole RadialCheckOrder
Q4012NH2TO-263 (D2Pak)124000.011010101.612070Surface MountCheckOrder
Q4012NH5TO-263 (D2Pak)124000.015050501.612070Surface MountCheckOrder
Q4012RH2TPTO-220 Non-Isolated Tab124000.011010101.612070Through Hole RadialCheckOrder
Q4012RH5TPTO-220 Non-Isolated Tab124000.015050501.612070Through Hole RadialCheckOrder
Q6012LH2TPTO-220 Isolated Tab126000.011010101.612070Through Hole RadialCheckOrder
Q6012LH5TPTO-220 Isolated Tab126000.015050501.612070Through Hole RadialCheckOrder
Q6012NH2TO-263 (D2Pak)126000.011010101.612070Surface MountCheckOrder
Q6012NH5TO-263 (D2Pak)126000.015050501.612070Surface MountCheckOrder
Q6012RH2TPTO-220 Non-Isolated Tab126000.011010101.612070Through Hole RadialCheckOrder
Q6012RH5TPTO-220 Non-Isolated Tab126000.015050501.612070Through Hole RadialCheckOrder
Q8012LH2TPTO-220 Isolated Tab128000.011010101.612070Through Hole RadialCheckOrder
Q8012LH5TPTO-220 Isolated Tab128000.015050501.612070Through Hole RadialCheckOrder
Q8012NH2TO-263 (D2Pak)128000.011010101.612070Surface MountCheckOrder
Q8012NH5TO-263 (D2Pak)128000.015050501.612070Surface MountCheckOrder
Q8012RH2TPTO-220 Non-Isolated Tab128000.011010101.612070Through Hole RadialCheckOrder
Q8012RH5TPTO-220 Non-Isolated Tab128000.015050501.612070Through Hole RadialCheckOrder
QK012LH2TPTO-220 Isolated Tab1210000.011010101.612070Through Hole RadialCheckOrder
QK012LH5TPTO-220 Isolated Tab1210000.015050501.612070Through Hole RadialCheckOrder
QK012NH2TO-263 (D2Pak)1210000.011010101.612070Surface MountCheckOrder
QK012NH5TO-263 (D2Pak)1210000.015050501.612070Surface MountCheckOrder
QK012RH2TPTO-220 Non-Isolated Tab1210000.011010101.612070Through Hole RadialCheckOrder
QK012RH5TPTO-220 Non-Isolated Tab1210000.015050501.612070Through Hole RadialCheckOrder
Obsolete: 2011 -12-31
Replaced By: Q4012LH5
TO-220 Isolated Tab122000.015050501.612070Through Hole RadialCheck
Obsolete: 2011 -12-31
Replaced By: Q4012NH5
TO-263 (D2Pak)122000.015050501.612070Surface MountCheck
Obsolete: 2011 -12-31
Replaced By: Q4012RH5
TO-220 Non-Isolated Tab122000.015050501.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: Q4012LH2TP
TO-220 Isolated Tab124000.011010101.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: Q4012LH5TP
TO-220 Isolated Tab124000.015050501.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: Q4012RH2TP
TO-220 Non-Isolated Tab124000.011010101.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: Q4012RH5TP
TO-220 Non-Isolated Tab124000.015050501.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: Q6012LH2TP
TO-220 Isolated Tab126000.011010101.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: Q6012LH5TP
TO-220 Isolated Tab126000.015050501.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: Q6012RH2TP
TO-220 Non-Isolated Tab126000.011010101.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: Q6012RH5TP
TO-220 Non-Isolated Tab126000.015050501.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: Q8012LH2TP
TO-220 Isolated Tab128000.011010101.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: Q8012LH5TP
TO-220 Isolated Tab128000.015050501.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: Q8012RH2TP
TO-220 Non-Isolated Tab128000.011010101.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: Q8012RH5TP
TO-220 Non-Isolated Tab128000.015050501.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: QK012LH2TP
TO-220 Isolated Tab1210000.011010101.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: QK012LH5TP
TO-220 Isolated Tab1210000.015050501.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: QK012RH2TP
TO-220 Non-Isolated Tab1210000.011010101.612070Through Hole RadialCheck
Obsolete: 2016 -03-31
Replaced By: QK012RH5TP
TO-220 Non-Isolated Tab1210000.015050501.612070Through Hole RadialCheck
Catalog # Certificates
Sorting icon
Q2012LH5 UR
Q4012LH5 UR
Q6012LH5 UR
Q8012LH5 UR
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s)
Q2012LH5 RoHS No 01/01/1996 PbFree No
Q2012NH5RP RoHS No 01/01/1996 PbFree No
Q2012NH5TP RoHS No 01/01/1996 PbFree No
Q2012RH5 RoHS No 01/01/1996 PbFree No
Q4012NH2RP RoHS No 01/01/1996 PbFree No
Q4012NH2TP RoHS No 01/01/1996 PbFree No
Q4012NH5RP RoHS No 01/01/1996 PbFree No
Q4012NH5TP RoHS No 01/01/1996 PbFree No
Q6012LH2TP RoHS No 01/01/1996 PbFree No 07/09/2012 CoC_RoHS9_Q6012LH2TP_06-22-2018 REACH197_Declaration_with_Pb_Q6012LH2TP_05-02-2019 Yes
Does not Contain
Q6012LH5TP RoHS No 01/01/1996 PbFree No CoC_RoHS9_Q6012LH5TP_1-22-2018 REACH197_Declaration_with_Pb_Q6012LH5TP_01-30-2019 Yes
Does not Contain
Q6012NH2RP RoHS No 01/01/1996 PbFree No
Q6012NH2TP RoHS No 01/01/1996 PbFree No
Q6012NH5RP RoHS No 01/01/1996 PbFree No CoC_RoHS9_Q6012NH5RP_5-14-2019 REACH197_Declaration_with_Pb_Q6012NH5RP_5-14-2019 Yes
Does not Contain
Q6012NH5TP RoHS No 01/01/1996 PbFree No Yes
Q6012RH5TP RoHS No 01/01/1996 PbFree No 07/09/2012 CoC_RoHS9_Q6012RH5TP_10-03-2019 REACH201_Declaration_with_Pb_Q6012RH5TP_10-03-2019 Yes
Does not Contain
Q8012LH5TP RoHS No 01/01/1996 PbFree No CoC_RoHS9_Q8012LH5TP_09-18-2019 REACH201_Declaration_with_Pb_Q8012LH5TP_9-18-2019 Yes
Does not Contain
Q8012NH2RP RoHS No 01/01/1996 PbFree No
Q8012NH2TP RoHS No 01/01/1996 PbFree No
Q8012NH5RP RoHS No 01/01/1996 PbFree No
Q8012NH5TP RoHS No 01/01/1996 PbFree No
Q8012RH5TP RoHS No 01/01/1996 PbFree No CoC_RoHS9_Q8012RH5TP_03-27-2019 REACH197_Declaration_with_Pb_Q8012RH5TP_03-27-2019 Yes
Does not Contain
QK012NH2RP RoHS No 01/01/1996 PbFree No
QK012NH2TP RoHS No 01/01/1996 PbFree No
QK012NH5RP RoHS No 01/01/1996 PbFree No
QK012NH5TP RoHS No 01/01/1996 PbFree No
If the product environmental information that you are looking for does not appear in this tab,
please complete the Product Environmental Information Request Form.

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