**EXHIBIT 21**

 

**SignificantSubsidiaries**

 

The Company is includingin the following list, legal entities and divisional, branch office orsignificant office locations:

 
| World Headquarters                                             |
|----------------------------------------------------------------|
|                                                           |
| International Rectifier  Corporation                           |
| 233 Kansas Street                                              |
| El Segundo, CA 90245                                           |
| Phone:                                                         | (310) 726-8000 |
| FAX:                                                           | (310) 322-3332 |
| Internet: www.irf.com                                          |
|                                                           |
| North American  Operations                                     |
|                                                           |
| HEXFET America                                                 |
| 41915 Business Park  Drive                                     |
| Temecula, CA 92590                                             |
| Phone:                                                         | (909) 676-7500 |
| FAX:                                                           | (909) 676-9154 |
|                                                           |   |
| Rectificadores  Internacionales, S.A. de C.V.                  |
| Prolongacion Ave. Los  Cabos No. 9234                     |
| Parque Industrial  Pacifico II                                 |
| C.P. 22709                                                     |
| Tijuana, Baja  California, Mexico                              |
| Phone:                                                         | (++) 52 66 26 08 04 |
| FAX:                                                           | (++) 52 66 26 01 02 |
|                                                           |   |
| International Rectifier  HiRel Products LLC (formerly Omnirel) |
| 205 Crawford Street                                            |
| Leominster, MA 01453                                           |
| Phone:                                                         | (978) 534-5776 |
| FAX:                                                           | (978) 537-4246 |
|                                                           |   |
| Advanced  Analog, Inc.                                    |
| 2270 Martin Avenue                                             |
| Santa Clara, CA 95050                                          |
| Phone:                                                         | (408) 727-0500 |
| Fax:                                                           | (408) 988-2702 |
|                                                           |   |
| Unisem, Inc.                                              |
| DC-DC Power Management  ICs                                    |
| 34A Mauchly                                                    |
| Irvine, CA 92618                                               |
| Phone:                                                         | (949) 453-1008 |
| Fax:                                                           | (949) 453-8748 |
|                                                           |   |
| IR Epi  Services, Inc.                                    |
| 550 West Juanita                                               |
| Mesa, Arizona 85210                                            |
| Phone:                                                         | (480) 668-4000 |
| FAX:                                                           | (480) 464-7421 |

 

1

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| European Operations                                   |
|-------------------------------------------------------|
|                                                  |   |
| International Rectifier  Company                      |
| (Great Britain) Ltd.                                  |
| 439/445 Godstone Road                                 |
| Whyteleafe, Surrey                                    |
| CR3 OBL, United Kingdom                               |
| Phone:                                                | (++) 44 0 20 8645 8000 |
| FAX:                                                  | (++) 44 0 20 8645 8077 |
|                                                  |   |
| Research and  Development Facility                    |
| Holland Road, Hurst  Green                            |
| Oxted, Surrey, RH8 9BB                                |
| Phone:                                                | (++) 44 1883 732020 |
| FAX:                                                  | (++) 44 1883 733410 |
|                                                  |   |
| Branch Office — Denmark                          |
| Bagsvaerdvej 92                                       |
| DK-2800, KONGENS LYNGBY                               |
| Phone:                                                | (++) 45 45 28 06 96 |
| FAX:                                                  | (++) 45 45 28 19 96 |
|                                                  |   |
| Branch Office – Finland                          |
| Mikkelankallio 3  FIN-02770 ESPOO                     |
| Phone:                                                | (++) 358 9 8599 155 |
| FAX:                                                  | (++) 358 9 8599 1560 |
|                                                  |   |
| Branch Office — France                           |
| Immeuble Zeta B 3  Avenue de Canada B LP8177          |
| 91974 Courtaboeuf  Cedex, France                      |
| Phone:                                                | (++) 33 1 64 86 49 50 |
| FAX:                                                  | (++) 33 1 64 86 49 70 |
|                                                  |   |
| Branch Office — Sweden                           |
| Box 8159 , S-163 08,  Spanga                          |
| Phone:                                                | (++) 46 8 795 9840 |
| FAX:                                                  | (++) 46 8 795 9895 |
|                                                  |   |
| International Rectifier                               |
| Electronic Motion  Systems, Ltd.                      |
| Llys-Y-Ddraig,  Penllergaer Business Park             |
| Swansea, SA4 1HL,  Wales, United Kingdom              |
| Phone:                                                | (++) 44 1792 54 3000 |
| FAX:                                                  | (++) 44 1792 54 3001 |
|                                                  |   |
| International Rectifier  Corporation Italiana, S.p.A. |
| Via Liguria 49, 10071  Borgaro,                       |
| Torino (To), Italy                                    |
| Phone:                                                | (++) 39 011 451 0111 |
| FAX:                                                  | (++) 39 011 451 0220 |

 

2

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| IR Newport Limited                           |
|----------------------------------------------|
| Cardiff Road                                 |
| Newport, Wales                               |
| NP10 8YJ, United  Kingdom                    |
| Phone:                                       | (++) 49 1633 810 121 |
| FAX:                                         | (++) 49 1633 810 820 |
|                                         |   |
| TechnoFusion GmbH                            |
| Kreuzweg 60                                  |
| D-47809 Krefeld Germany                      |
| Phone:                                       | (++) 49 2151 576 670 |
| FAX:                                         | (++) 49 2151 576 323 |
|                                         |   |
| Branch Office – U.S.A                   |
| 34119 W. 12 Mile,  Suite 104            |
| Farmington Hills, MI  48331                  |
| Phone:                                       | (248) 553-6020 |
| FAX:                                         | (248) 553-3048 |
|                                         |   |
| International Rectifier  GmbH                |
| Frankfurter Strasse 227                      |
| D-63263 Neu-Isenburg  Germany                |
| Phone:                                       | (++) 49 6102 884 400 |
| FAX:                                         | (++) 49 6102 884 433 |
|                                         |   |
| Branch Office — Switzerland             |
| Riedmatt 9, CH-8153 Rümlang             |
| Phone:                                       | (++) 41 1 817 3615 |
| FAX:                                         | (++) 41 1 817 6299 |
|                                         |   |
| IR International  Holdings, Inc.        |
| Branch Office — Moscow,  Russia         |
| Room 325  Semenovsky per. 15            |
| Moscow, 105023, Russia                       |
| Phone:                                       | (++) 7 095 360 5735 |
| FAX:                                         | (++) 7 095 964 9560 |
|                                         |   |
| Asian Operations                             |
|                                         |   |
| International Rectifier  Japan Company, Ltd. |
| Sunshine 60 Building,  51st Floor            |
| 3-1-1,  Higashi-Ikebukuro                    |
| Toshima-ku, Tokyo,  170-6051 Japan           |
| Phone:                                       | (++) 81 33 983 0641 |
| FAX:                                         | (++) 81 33 983 5956 |
|                                         |   |
| Branch Office — Osaka,  Japan           |
| KAZU IT Bldg.                                |
| 2-10-27 Minami-Semba                         |
| Chuo-ku, Osaka-Shi,  Osaka 542-0081          |
| Phone:                                       | (++) 81 66 258 7560 |
| FAX:                                         | (++) 81 66 258 7561 |

 

3

----

 
| Shanghai International  Rectifier Trading, Ltd.           |
|-----------------------------------------------------------|
| 231 Fu Te Road North                                      |
| Waigaoqiao Free Trade  Zone                               |
| Pudong, Shanghai,  200231, P.R. China                     |
| Phone:                                                    | (++) 86 21 5866 6060 |
| FAX:                                                      | (++) 86 21 5866 1654 |
|                                                      |   |
| Xian International  Rectifier Semiconductor Mfg. Co. Ltd. |
| #94 Zhu Que Street                                        |
| Xian, Shaanxi province,  710061, P.R. China               |
| Phone:                                                    | (++) 86 29 524 7490/ 92 |
| FAX:                                                      | (++) 86 29 524 7423 |
|                                                      |   |
| IR International  Holdings, Inc.                     |
| Representative Office                                     |
| Canway Building,  Suite 710                          |
| 66 Nan Li Shi Road, Xi  Cheng District                    |
| Beijing, 100045, P.R.  China                              |
| Phone:                                                    | (++) 86 10 6803  8195 & 6803 8196 |
| FAX:                                                      | (++) 86 10 6803 8194 |
|                                                      |   |
| Representative Office                                     |
| Electronic  Science & Technology Building        |
| 28 C2, Block C, 2070  Shennan Road                        |
| Shenzhen, 518031, P.R.  China                             |
| Phone:                                                    | (++) 86 755 3683686 |
| FAX:                                                      | (++) 86 755 3683690 |
|                                                      |   |
| Representative Office                                     |
| Unit 03, 13th Floor,  Novel Plaza                         |
| 128 Nan Jing Road (W)                                     |
| Shanghai, China 200003                                    |
| Phone:                                                    | (++) 86 21 63608811 |
| Fax:                                                      | (++) 86 21 63603771 |
|                                                      |   |
| Representative Office                                     |
| 16th Floor,  Suite B, 319, Sec. 2                    |
| Tun Hwa South Road                                        |
| Taipei 10673, Taiwan,  R.O.C.                             |
| Phone:                                                    | (++) 886 2 2739 4230 |
| FAX:                                                      | (++) 886 2 2377 9936 |
|                                                      |   |
| Representative Office                                     |
| Suite 2111,  Herrera Tower                           |
| 98 Herrera Corner  Valero St., Salcedo Village            |
| Makati City,  Philippines 1200                            |
| Phone/FAX:                                                | (++) 632 845 1653 |
|                                                      |   |
| IR International  Holdings China, Inc.               |
| IR-PERI Power Electronics  Co. Ltd.                       |
| #94 Zhu Que Street                                        |
| Xian, Shaanxi province,  710061, P.R. China               |
| Phone:                                                    | (++) 86 29 521 5895 |
| FAX:                                                      | (++) 86 29 521 5896 |
|                                                      |   |
| International Rectifier  Korea                            |
| #402, Noksan Building,  106-8                             |
|                                                           |  |  |

 

4

----

 
| Kuro-5Dong, Kuro-Gu                      |
|------------------------------------------|
| Seoul, 152-842 Korea                     |
| Phone:                                   | (++) 822 858 8773 |
| FAX:                                     | (++) 822 858 8775 |
|                                     |   |
| International Rectifier                  |
| Southeast Asia Pte.  Ltd.                |
| 50 Kallang Avenue  #08-01/03             |
| Noel Corporate Building                  |
| Singapore 339505                         |
| Phone:                                   | (++) 65 295 9555 |
| FAX:                                     | (++) 65 392 3550 |
|                                     |   |
| International Rectifier  Hong Kong, Ltd. |
| Unit 308, New East  Ocean Centre         |
| No. 9 Science  Museum Road          |
| Tsimshatsui East,  Kowloon               |
| Hong Kong                                |
| Phone:                                   | (++) 852 2803 7380 |
| FAX:                                     | (++) 852 2540 5835 |
|                                     |   |
| Semiconductor  Electronics Ltd.          |
| S.D.F.I. Unit No. 23,  SEEPZ        |
| Andheri (East)                           |
| Mumbai 400 096, India                    |
| Phone:                                   | (++) 91 22 829 1055 |
| FAX:                                     | (++) 91 22 829 0473 |

 

5

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