Abstract

This specification covers the special requirements for a metal strip used in the fabrication of integrated-circuit lead frames by stamping or photochemical milling. The metal strip shall be manufactured from copper and copper alloys, ferrous alloys containing nickel, cobalt, or chromium, nickel and nickel alloys, or other metallic materials and shall conform to the chemical, physical, and mechanical property requirements specified, including the limitation on the severity and number of inclusions, the surface finish, and the coil size. Tests for straightness, flatness, coil set, and grain size shall be performed and shall conform to the requirements specified.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope

1.1 This specification covers the special requirements for metal strip to be used to fabricate integrated-circuit lead frames by stamping or photochemical milling.

1.2 The metals that are applicable to these parts include copper and copper alloys, ferrous alloys usually containing nickel or cobalt or chromium, nickel and nickel alloys, and other metallic materials.

1.3 The general chemical, physical, and mechanical property requirements of these materials are covered by other ASTM specifications (specifically Specifications B103/B103M , B122/B122M , B152/B152M , B162 , B465 , F15 , F30 , F31 , and F68 ), and these should be consulted for properties and tempers that are different for the different metals. For metals for which no ASTM specification is available, other specifications should be adopted by agreement of the parties concerned.

1.4 TThe values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

B103/B103M Specification for Phosphor Bronze Plate, Sheet, Strip, and Rolled Bar

B122/B122M Specification for Copper-Nickel-Tin Alloy, Copper-Nickel-Zinc Alloy (Nickel Silver), and Copper-Nickel Alloy Plate, Sheet, Strip, and Rolled Bar

B152/B152M Specification for Copper Sheet, Strip, Plate, and Rolled Bar

B162 Specification for Nickel Plate, Sheet, and Strip

B465 Specification for Copper-Iron Alloy Plate, Sheet, Strip, and Rolled Bar

E112 Test Methods for Determining Average Grain Size

F15 Specification for Iron-Nickel-Cobalt Sealing Alloy

F30 Specification for Iron-Nickel Sealing Alloys

F31 Specification for 42a??% Nickel-6a??% Chromium-Iron Sealing Alloy

F49 Specification for Molybdenum Strip for Electron Tubes (Withdrawn 1978)

F68 Specification for Oxygen-Free Copper in Wrought Forms for Electron Devices

Keywords

copper alloys; iron-nickel alloys; iron-nickelchromium alloy; iron-nickel-cobalt alloys; lead frame material; molybdenum; Copper alloy--specifications; Copper electrical conductors--specifications; Integrated circuits; Metal electronic components/devices--specifications; Metal surfaces--specifications; Nickel alloys (electronic applications)--specifications; Nickel electrical/electronic applications--specifications;

ICS Code

ICS Number Code 31.240 (Mechanical structures for electronic equipment)

DOI: 10.1520/F0375-89R10

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ASTM F375