EXHIBIT 99.1 SUPERTEX, INC. PRESS RELEASE FOR IMMEDIATE RELEASE			 Contact:	Dr. Henry C. Pao October 13, 2003					President & CEO 						Tel:	408-222-8888 						Fax:	408-222-4800 					 Email:	investors@supertex.com SUPERTEX REPORTS SECOND FISCAL QUARTER RESULTS Sunnyvale, CA (October 13, 2003) - Supertex, Inc. (NASDAQ: SUPX) today reported net sales of $12,315,000 for its second fiscal quarter ended September 30, 2003, a 7% decrease from the $13,220,000 reported for the same quarter of the prior year and a 1% decrease compared with the prior quarter of $12,479,000. Net income for the quarter decreased 37% to $447,000 or $0.03 per share on a diluted basis from $713,000 or $0.06 per share on a diluted basis for the same quarter of the prior year, and decreased 42% from $776,000 or $0.06 per share on a diluted basis when compared with the prior quarter. For the six-month period ended September 30, 2003 versus the same period of the prior year, net sales decreased 6% from $26,497,000 to $24,794,000, but net income increased 15% from $1,060,000 to $1,223,000. Dr. Henry C. Pao, President and CEO commented, "As we forecast at our last Conference Call, our sales were essentially flat with the prior quarter. Sales of our backlighting chips to the cell phone industry were flat and we expect future demand to be at this lower run rate. In our medical segment there was some price erosion and we expect this to stabilize in the second half of our fiscal year. Recovery in our telecom segment still remains elusive. Based on customer projections, which we anticipate will be followed by confirmed orders, we expect revenue growth during the second half of our fiscal year, particularly in the fourth quarter. Gross margin for the quarter was 39%, down 3 % from the prior quarter. During the quarter, we had a planned inventory reduction of approximately $1.1 million, which we believe is healthy for the Company going forward, but did affect the gross margin adversely for the quarter due to further under-utilization of our production capacity. Cash flow remained positive. We believe we will start to see some production capacity utilization improvement as demand for our products increases. R&D spending remains under tight control but at a high level, almost 18% of sales. We introduced some very exciting new products during the quarter. We continue to add sales and technical marketing resources to support these new products. Design-wins and requests for quotations of our new products have continued at a good rate." Forward Looking Statements The industry in which we compete is characterized by extreme rapid changes in technology and frequent new product introductions. We believe that our long-term growth will depend largely on our ability to continue to enhance existing products and to introduce new products and features that meet the continually changing requirements of our customers. All statements contained in this press release that are not historical facts are forward-looking statements. They include our expectations as to demand, pricing, and revenues, both overall and in specific markets; our anticipation that fab capacity utilization will improve as product demand increases; and our expectation that a large portion of our third quarter business will continue to be turns business. These forward-looking statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. They are not guarantees of future performance or events but rather involve a number of risks and uncertainties including, but not limited to, whether our customers experience the demand we anticipate for their products which incorporate our products, whether competitors introduce products at lower prices than our products causing price erosion, and whether our customers continue to have difficulty forecasting demand for their products as well as other risk factors detailed in our Form 8-K, 10-K, and 10-Q filings with the Securities and Exchange Commission. Due to these and other risks, our future actual results could differ materially from those discussed above. These forward-looking statements are based on our goals and objectives and our assumptions about, and assessment of, the future and may or may not prove true. They speak only as to the date of this release, and we undertake no obligation to publicly release updates or revisions to these statements. Conference Call Details The Company will host a conference call at 2:30 p.m. PDT (5:30 p.m. EDT) on October 13, 2003, following the earnings release. President and Chief Executive Officer, Dr. Henry C. Pao and Executive Vice President, Richard E. Siegel will present an overview of the second fiscal quarter financial results, discuss current business conditions and then respond to questions. The call is available live to listen or ask questions by dialing 800-223-9488 (domestic) or 785-832-1508 (toll, international) at least 5 minutes before the scheduled start time, and by asking to be connected to the Supertex Quarterly Earnings Release Call. A recorded replay will be available until 11:59 p.m., October 27, 2003 by dialing 800-283-4799 (domestic) or 402-220-0860 (toll, international). The conference call is also available live via the Internet by logging on to the following URL: http://www.firstcallevents.com/service/ajwz389642792gf12.html . If you are unable to participate during the live webcast, the call will be archived at www.supertex.com. About Supertex Supertex, Inc. is a publicly held mixed signal semiconductor manufacturer, focused in high voltage interface products for use in the telecommunications, networking systems, flat panel displays, medical and industrial electronics industries. Supertex product, corporate and financial information is readily available at www.supertex.com. For further information, contact Dr. Henry C. Pao at Supertex, Inc., 1235 Bordeaux Drive, Sunnyvale, California 94089, 408-222-8888 or visit our Website at http://www.supertex.com 				SUPERTEX, INC. 		CONSOLIDATED INCOME STATEMENT INFORMATION 				(unaudited) 			 Three-months Ended 	 Six-months Ended 		 	 September 30,	 	 September 30, 			 (in thousands, except per share amounts) 		 	 2003 2002 2003 	2002 Net sales	 	 $ 12,315 $ 13,220 $ 24,794 $ 26,497 Cost of sales 7,523 8,102 14,812 16,951 			 -------- -------- --------	 -------- Gross profit		 4,792 5,118 9,982 9,546 Research and development 2,276 2,489 4,506 4,807 Selling, general and administrative 2,203 2,206 4,593 4,041 			 -------- -------- -------- -------- Income from operations 313 423	 883 698 Interest and other income, net			 334 657 888 908 			 -------- -------- -------- -------- Income before income taxes 647 1,080 1,771 1,606 Provision for income taxes 200 367 548 546 			 -------- -------- -------- -------- Net income $ 447 $ 713 $ 1,223 $ 1,060 			 ======== ======== ======== ======== Net income per share Basic		 $ 0.04 $ 0.06 $ 0.10 $ 0.08 			 ========	======== ========	 ======== Diluted		 $ 0.03 $ 0.06 $ 0.09 $ 0.08 			 ======== ======== ======== ======== Shares used in per share computation Basic	 		 12,723 12,589 12,705 12,582 			 ======== ======== ======== ======== Diluted 13,047 12,640 12,977 12,788 			 ======== ======== ======== ======== 				SUPERTEX, INC. 		 CONSOLIDATED BALANCE SHEET INFORMATION 				(unaudited) 			 September 30, 2003	 March 31, 2003 			 (in thousands) ASSETS Cash and cash equivalents 		 $ 59,414	 $ 60,931 Short term investments				9,518		 3,945 Accounts receivable, net			9,176		 10,134 Inventories, net			 14,325 14,582 Deferred income taxes				4,030		 4,030 Other current assets			 655 575 					 -----------	 ----------- Total current assets			 97,118 94,197 Property, plant and equipment 		 11,042 12,104 Long term investments and other			 97 97 Deferred income taxes			 2,273 2,273 					 ----------- ----------- TOTAL ASSETS				 $ 110,530 $ 108,671 					 ===========	 =========== LIABILITIES Trade accounts payable 			 $ 2,315 $ 3,572 Accrued salaries, wages and employee benefits					6,560 6,784 Other accrued liabilities			 478		 485 Deferred revenue 		 3,017 2,001 Income taxes payable 3,373 3,304 					 -----------	 ----------- Total current liabilities 15,743 16,146 					 -----------	 ----------- SHAREHOLDERS' EQUITY Common stock				 30,084 29,045 Retained earnings 64,703 63,480 					 -----------	 ----------- Total shareholders' equity 94,787 92,525 					 -----------	 ----------- TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY			 $ 110,530 $ 108,671 					 ===========	 ===========