A6217KEJTR-J

February 12, 2020 Regarding: ALLEGRO THAILAND TEST TRANSFER TO ALLEGRO PHILIPPINES Dear Valued Customer, This letter is to inform you that, in conjunction with our Board, Allegro MicroSystems’ management has decided to transition all equipment and activity out of our Allegro MicroSystems (Thailand) Co., Ltd (AMTC) facility to consolidate manufacturing at the Allegro MicroSystems Philippines, Inc. (AMPI) location. There were multiple factors that influenced this decision, including market conditions and activity levels. In addition to these factors, our AMPI location is capable of supporting more than double its current volume. As a result of this decision, we will be transferring test, pack, and ship operations for our Power IC product line to AMPI. Transitioning FROM: Allegro MicroSystems (Thailand) Co., Ltd 198 Moo 7, Nong Pla Mo, Nong Khae Saraburi Thailand 18140 Transitioning TO: Allegro MicroSystems Philippines, Inc. 4756 Sampaguita Street, Marimar Village Barangay Sun Valley, Parañaque City 1700 Philippines Our AMPI location is a long-established, TS16949 certified test facility where Allegro has been testing our broad range of automotive grade, robust sensor and power IC products for decades. All existing test equipment will transfer from the AMTC facility to the AMPI facility, ensuring no change to how our products are tested today. Each product will be run on the same make and model of test equipment as they are today. Allegro will be transitioning AMTC’s test, pack, and ship operations to our AMPI facility throughout calendar year 2020. Please refer to the appendix for a listing of Power IC products associated with this transition. Please note at Allegro’s discretion, the Product Change Notification format may be utilized where Allegro deems a more comprehensive notification is warranted. Appendix: Allegro Catalog Part Numbers – Transfer to Allegro Philippines Test MOTOR DRIVERS A4956KLPTR-T A5940GEJTR-T A4913KJPTR-T-1 A4957SESTR-T A5940KLKTR-T A4915METTR-T A4960KJPTR-A-T A5943GLPTR-T A3908EEETR-T A4916KJPTR-T A4960KJPTR-T A5947GETTR-T A3909GLNTR-T A4918KJPTR-5-T A4960SJPTR-T A5947KLPTR-T A3910EEETR-T A4918KJPTR-A-5-T A4963GLPTR-T A5949GETTR-T A3916GESTR-T A4919GETTR-3-T A4964KEVTR-J A5949GLPTR-T A3916GESTR-T-1 A4919GETTR-5-T A4964KJPTR-T A5950GEUSR-T A3918SESTR-T A4919GETTR-T A4979GLPTR-T A5950GLPTR-T A3921KLPTR-T A4926KLPTR-T A4980KLPTR-T A5950KEUSR-J A3924KLVTR-T A4928KLPTR-T A4982SETTR-T A5957GESTR-T A3930KJPTR-T A4930GETTR-T A4982SLPTR-T A5976GLPTR-T A3931KJPTR-T A4931METTR-T A4983SETTR-T A5977GLPTR-T A3935KLQTR-T A4933KJPTR-T A4984SESTR-T A5979GLPTR-T A3938SLDTR-T A4935KJPTR-8-T A4984SETTR-T A5984GESTR-T A3941KLPTR-T A4935KJPTR-T A4984SLPTR-T A5984GETTR-T A3942KLGTR-T A4938EETTR-T A4985SESTR-T A5985GETTR-T A3946KLPTR-T A4939KLPTR-5-T A4985SETTR-T A5988GEVTR-1-T A3950SEUTR-T A4942GESTR-T A4985SLPTR-T A5988GEVTR-T A3950SLPTR-T A4943GLPTR-T A4986SESTR-T A5988GJPTR-1-T A3959SLPTR-T A4945GLJTR-T A4986SLPTR-T A5988GJPTR-T A3977SLPTR-T A4947GLPTR-T A4987SESTR-T A5989GEVTR-T A3983SLPTR-T A4949GLJTR-6-T A4987SLPTR-T A5995GEVSR-T A3984SLPTR-T A4949GLJTR-T A4988SETTR-T A6627SJP-T A3988SEVTR-1-T A4949GLTR-T A4992KLPTR-T A6628SEVTR-T A3988SEVTR-T A4949KLJTR-T A5929KLPTR-T A6641SETTR-T A3988SJPTR-1-T A4950ELJTR-L-T A5931GESTR-T A6651SEVTR-T A3988SJPTR-T A4950ELJTR-T A5931GLPTR-T A6652SEVTR-T A3989SEVTR-T A4950KLJTR-T A5931KLPTR-T A6862KLPTR-T A3992SLPTR-T A4953ELJTR-T A5932GESSR-1-T A89301GESSR A3995SEVTR-T A4954ELPTR-T A5932GESSR-T AMT49105KEVTR-J A3998SETTR-T A4955GESTR-T A5932GLPTR-1-T AMT49400GLKATR A4910KJPTR-T A4955GLPTR-T A5932GLPTR-T AMT49406GESSR A4911KEVSR-J-1 A4955KLPTR-T A5932KESSR-J AMT49413GEVATR A4911KJPTR-T A4956GESTR-T A5932KLPTR-T AMT49700KETJTR A4911KJPTR-T-1 A4956GLPTR-T A5936GLKTR-T AMT49701GEVATR A3901SEJTR-T A4913KJPTR-T A3903EEETR-T A3906SESTR-T AMT49702KLPATR -2- A4403GEUTR-T REGULATORS & LIGHTING A6260SLJTR-T A8303SESTR-T A8590KLPTR-T-2 A4405KLPTR-T A6261ELPTR-T A8303SESTR-T-1 A8591KEJTR-J-1 A4407KLPTR-T A6261KLJTR-T-1 A8304SESTR-T A8600EJPTR-T A4408KLVTR-T A6263KLJTR-T A8305SESTR-T A8601KLPTR-T A4409KLPTR-T A6270KLPTR-T-1 A8307SESTR-T A8603KESTR-R A4411KLVTR-T A6274KLPTR-T-1 A8309SESTR-T A8650KEJTR-T A4412KLVTR-T A6284KLPTR-T A8498SLJTR-T A8650KEJTR-T-1 A4447SLJTR-T A6284KLPTR-T-1 A8500EECTR-T A8651KLPTR-T-1 A4450KESTR-J A80601KESJSR A8502KLPTR-T A8653KLPTR-T A4480KLJTR-T A80601KESJSR-1 A8510GECTR-T A8654KLPTR-T A4481KLJTR-T A80602KESJSR A8519KETTR-R A8660KESTR-J A4490EESTR-T A80602KESJSR-1 A8519KETTR-R-1 ALT80600KESJSR A4491EESTR-T A80603KESJSR A8519KLPTR-T ALT80800KLPATR A6211GLJTR-T A80603KESJSR-1 A8519KLPTR-T-1 ALT80802KEJJTR A6213KLJTR-1-T A8286SETTR-T A8522KLPTR-T ARG81300SESWTR A6213KLJTR-T A8290SETTR-T A8585KLKTR-T ARG81400KLVATR A6214KLKTR-T A8293SESTR-T A8586KEJTR-T ARG81800KESJSR A6216KLPTR-T A8295SESTR-T A8586KLJTR-T ARG81800KESJSR-1 A6217KEJTR-1-J A8296SESTR-T A8586KLJTR-T-1 ARG81801KESJSR A6217KLJTR-1-T A8299SETTR-T A8586KLJTR-T-2 ARG82800KLVATR A6217KLJTR-T A8300SESTR-T-1 A8587KEJTR-T ARG82801KLVATR A6260KLJTR-T A8302SETTR-T A8590KLPTR-T-1 ARG82801KLVATR-1 POWER INTERFACE A6850KLTR-T -3-