Jun 11, 2003 
A perennial challenge for analog designers, latch-up occurs when several JFETs on the same substrate form a parasitic junction that can turn on unexpectedly, causing excessive current to flow.
The complete new family of �no latch� monolithic dual JFETs, which includes more than 20 devices, overcomes this problem by providing an exposed substrate connection via an external pin, allowing designers to bias the substrate with a positive potential to prevent a latch-up condition.
Monolithic dual JFETs are widely used as a high-performance differential front end for amplifiers in test equipment, industrial process equipment, military monitors, and any other application where high-accuracy data acquisition is needed. Integrating two transistors on the same substrate ensures that the temperature of both channels is the same. As a result, performance is more evenly matched across the device�s operating temperature range than in implementations with two single-die JFETs.
Until now, designers have needed to use multi-chip JFETs or additional external components to ensure that no latch-up occurs. With this new family of devices, Vishay provides a significantly less expensive, monolithic alternative available in both the TO-78 and the surface-mount SOIC-8 packages.
The more than 20 devices released today offer a range of breakdown voltages from �25 V to �50 V.
For superior low-noise capability, offset/drift voltage ranges from 40 mV down to an extraordinarily low 5 mV. This tight VGS matching minimizes errors in front-end amplifiers. A range of gate-to-source cut-off voltage ratings from �0.5 V to �6 V gives designers a wide choice of devices to suit their specific applications.
Samples and production quantities of the new no-latch JFETs are available now, with lead times of six to eight weeks for larger orders. Pricing starts at less than $1 in 1000-piece quantities.
Siliconix is a leading manufacturer of power MOSFETs, power ICs, analog switches and multiplexers for computers, cell phones, fixed communications networks, automobiles, and other consumer and industrial electronic systems. With 2002 worldwide sales of $372.9 million, the Company's facilities include a Class 1, wafer fab dedicated to the manufacture of power products in Santa Clara, California, and an affiliated Class 1, wafer fab located in Itzehoe, Germany. The Company�s products are also fabricated by subcontractors in Japan, Germany, China and Taiwan. Assembly and test facilities include a company-owned facility in Taiwan, a joint venture in Shanghai, China, and subcontractors in the Philippines, China, Taiwan, Israel, and the United States.
Vishay, a Fortune 1,000 Company listed on the NYSE, is one of the world's largest manufacturers of discrete semiconductors (diodes, rectifiers, transistors, optoelectronics, and selected ICs) and passive electronic components (resistors, capacitors, inductors, and transducers). The Company�s components can be found in products manufactured in a very broad range of industries worldwide. Vishay is headquartered in Malvern, Pennsylvania, and has plants in sixteen countries employing over 25,000 people. Vishay can be found on the Internet at http://www.vishay.com.
Agency Contact:
Bob Decker
Wall Street Communications
Telephone: 1-215-209-0233
Email: bob.decker@wallstcom.com
READER CONTACT INFORMATION
THE AMERICAS
Vishay Siliconix
2201 Laurelwood Road
Santa Clara, California 95054
+1-619-336-0860
info@vishay.com
www.vishay.com
EUROPE
Ms. Marian Neil
Vishay Ltd.
Pallion Industrial Estate
Sunderland SR4 6SU
United Kingdom
Telephone: 44 191 5144155
Facsimile: 44 191 5658245
Ms. Margarete Seeharsch
Vishay-Semiconductor GmbH
Theresienstrasse 2
74072 Heilbronn
Germany
Telephone: 49 71 31 67 2831
Fax: 49 71 31 67 2423
Ms. Nathalie Caoudal
Vishay S.A.
4, rue de Salonique
95101 Argenteuil
France
Telephone: 33 1 39 98 22 56
Fax: 33 1 39 98 22 20
ASIA/PACIFIC
Ms. Sandra Sim
Vishay Intertechnology Asia Pte. Ltd.
Keppel Building #02-00
25 Tampines Street 92
Singapore 528877
Rep. of Singapore
Telephone: (65) 6780-7849
Fax: (65) 6788-0988
