ATE195198T1 - ZINC PHOSPHATE COATING FOR VARISTOR AND METHOD FOR PRODUCTION - Google Patents

ZINC PHOSPHATE COATING FOR VARISTOR AND METHOD FOR PRODUCTION

Info

Publication number
ATE195198T1
ATE195198T1 AT96400993T AT96400993T ATE195198T1 AT E195198 T1 ATE195198 T1 AT E195198T1 AT 96400993 T AT96400993 T AT 96400993T AT 96400993 T AT96400993 T AT 96400993T AT E195198 T1 ATE195198 T1 AT E195198T1
Authority
AT
Austria
Prior art keywords
varistor
production
zinc phosphate
phosphate coating
semiconductor
Prior art date
Application number
AT96400993T
Other languages
German (de)
Inventor
Palaniappan Ravindranathan
Original Assignee
Littlefuse Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Littlefuse Inc filed Critical Littlefuse Inc
Application granted granted Critical
Publication of ATE195198T1 publication Critical patent/ATE195198T1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/102—Varistor boundary, e.g. surface layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
    • H01C1/034—Housing; Enclosing; Embedding; Filling the housing or enclosure the housing or enclosure being formed as coating or mould without outer sheath

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)

Abstract

A method of providing a semiconductor device (20) with an inorganic electrically insulative layer (34) the device having exposed semiconductor surfaces (34) and electrically conductive metal end terminations (30) in which the device is reacted with phosphoric acid to form a phosphate on the exposed surfaces (34) of the semiconductor but not on the metal end terminations (30), and in which the device is thereafter barrel plated in a conventional electrical barrel plating process and the plating is provided only on the end terminations (30) because the phosphate is not electrically conductive. <IMAGE>
AT96400993T 1996-05-09 1996-05-09 ZINC PHOSPHATE COATING FOR VARISTOR AND METHOD FOR PRODUCTION ATE195198T1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96400993A EP0806780B1 (en) 1996-05-09 1996-05-09 Zinc phosphate coating for varistor and method

Publications (1)

Publication Number Publication Date
ATE195198T1 true ATE195198T1 (en) 2000-08-15

Family

ID=8225256

Family Applications (1)

Application Number Title Priority Date Filing Date
AT96400993T ATE195198T1 (en) 1996-05-09 1996-05-09 ZINC PHOSPHATE COATING FOR VARISTOR AND METHOD FOR PRODUCTION

Country Status (2)

Country Link
EP (1) EP0806780B1 (en)
AT (1) ATE195198T1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5614074A (en) * 1994-12-09 1997-03-25 Harris Corporation Zinc phosphate coating for varistor and method
GB2326976A (en) * 1997-06-30 1999-01-06 Harris Corp Varistor nickel barrier electrode
US6214685B1 (en) * 1998-07-02 2001-04-10 Littelfuse, Inc. Phosphate coating for varistor and method
US6841191B2 (en) * 2002-02-08 2005-01-11 Thinking Electronic Industrial Co., Ltd. Varistor and fabricating method of zinc phosphate insulation for the same
WO2020018651A1 (en) 2018-07-18 2020-01-23 Avx Corporation Varistor passivation layer and method of making the same
TWI760706B (en) * 2020-03-06 2022-04-11 立昌先進科技股份有限公司 Electronic component packaging structure and manufacturing method thereof

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5816602B2 (en) * 1979-02-09 1983-04-01 ティーディーケイ株式会社 Voltage nonlinear resistance element
GB2044531B (en) * 1979-02-09 1983-05-25 Tdk Electronics Co Ltd Non-linear resistance elements and method for manufacturing same
CA1186130A (en) * 1981-06-16 1985-04-30 Jeffery L. Barrall Rigid, water-resistant phosphate ceramic materials and processes for preparing them
JPH0770380B2 (en) * 1988-04-11 1995-07-31 ローム株式会社 Nickel plating method for electronic parts
JPH03131004A (en) * 1989-10-17 1991-06-04 Toshiba Corp Manufacture of non-linear resistor
GB2242066B (en) * 1990-03-16 1994-04-27 Ecco Ltd Varistor structures
JP2815990B2 (en) * 1990-07-26 1998-10-27 株式会社東芝 Manufacturing method of nonlinear resistor
JPH05136012A (en) * 1991-11-15 1993-06-01 Rohm Co Ltd Manufacture of chip-type electronic parts
US5614074A (en) * 1994-12-09 1997-03-25 Harris Corporation Zinc phosphate coating for varistor and method

Also Published As

Publication number Publication date
EP0806780A1 (en) 1997-11-12
EP0806780B1 (en) 2000-08-02

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