wafer

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wafer

1. Christianity a thin disc of unleavened bread used in the Eucharist as celebrated by the Western Church
2. Pharmacol an envelope of rice paper enclosing a medicament
3. Electronics a large single crystal of semiconductor material, such as silicon, on which numerous integrated circuits are manufactured and then separated

wafer

[′wā·fər]
(electronics)
A thin semiconductor slice on which matrices of microcircuits can be fabricated, or which can be cut into individual dice for fabricating single transistors and diodes.
(engineering)
A flat element for a process unit, as in a series of stacked filter elements.

wafer

(1) A small magnetic tape cartridge in the early 1980s. See Stringy Floppy.

(2) The base unit of chip making. A wafer is a slice taken from a salami-like silicon crystal ingot up to 300mm (11.8") in diameter. The larger the wafer, the more chips produced in a single production pass, which comprises a series of photomasking, etching and implantation steps. Wafers are approximately 1/30th of an inch thick; however, the actual layers of transistors that make up the active circuitry are only a few microns deep (see active area).

Wafers started out from one to three inches in diameter. Then came 100mm ingots (3.9"), followed by 125mm (4.9"), 150mm (5.9"), 200mm (7.9") and 300mm (11.8"). The much larger 450mm (17.7") wafer has yet to be produced in large quantities due to the huge investment in new machinery. See chip, chip manufacturing, transistor and wafer scale integration.


The Boule Is Sliced
The silicon ingot, which is known as a "boule," is sliced into wafers. (Image courtesy of IBM.)







Different Sizes
From top to bottom, the wafers are 150, 200 and 300mm (5.9", 7.9" and 11.8") in diameter. (Images from top to bottom courtesy of Texas Instruments, Inc., Advanced Micro Devices, Inc. and Intel Corporation.).


Different Sizes
From top to bottom, the wafers are 150, 200 and 300mm (5.9", 7.9" and 11.8") in diameter. (Images from top to bottom courtesy of Texas Instruments, Inc., Advanced Micro Devices, Inc. and Intel Corporation.).


Different Sizes
From top to bottom, the wafers are 150, 200 and 300mm (5.9", 7.9" and 11.8") in diameter. (Images from top to bottom courtesy of Texas Instruments, Inc., Advanced Micro Devices, Inc. and Intel Corporation.).







Heating the Wafers
The red glow comes from a furnace that reaches 1000 degrees centigrade. The semiconductor wafers are baked in the oven to prepare them for the chip-making process. (Image courtesy of Intel Corporation.)
References in periodicals archive ?
* Tall glass * Spoon * 1/2 cup crushed vanilla wafers, plus 1 wafer for garnish * 2/3 cup fresh strawberries, washed and sliced * 6-ounce container low-fat vanilla yogurt What You Do:
The Assembly 1 box of Nilla vanilla wafers 5 or 6 ripe bananas, sliced 1 cup crushed pineapple, drained thoroughly Line the bottom of a 1 1/2-quart baking dish with a layer of vanilla wafers, banana slices and a sprinkling of pineapple.
ORANGE NO-BAKE COOKIES 3/4 box (16 ounces) confectioner's sugar 1 box (12 ounces) vanilla wafers, crumbled 1 stick margarine 1 cup chopped nuts 1 can (6 ounces) frozen orange juice 1 can (31/4 ounces) coconut 1 In bowl, combine confectioner's sugar, vanilla wafers, margarine, nuts and orange juice; mix well.
Place some marshmallows between vanilla wafers and microwave until gooey.
But I'm certain the vanilla wafers I scoffed down at every opportunity on family outings and seaside holidays were better for me than the massproduced ice creams that dominate the market today.
The cookies feature classic Keebler fudge covering jumbo-sized vanilla wafers. Available in Original and Peanut Butter flavors, the individually wrapped bars will be offered in January 2011.
To honor her mother's banana pudding, Mankin created Southern-style Banana Puddin' Fudge featuring a thick ribbon of fresh banana puree suspended in vanilla fudge with crushed vanilla wafers and topped with marshmallow foam.
SusieCakes This Brent-wood bakery has all your childhood favorites covered: whoopie pies, lemon squares, icebox pie, frosted animal cookies, and banana pudding with vanilla wafers. Closed Sun; 11708 San Vicente Blvd.; 310/442-2253.
The strawberry yogurt filled chocolates and vanilla wafers along with dark chocolate bars contain the company's probiotic culture Howaru Acidophilus and its prebiotic ingredients Litesse and Lactitol.
The suggested retail price is $3.79 for a seven-ounce box of the Chocolate Chip or Iced Oatmeal variety, or an eight-ounce box of the Vanilla Wafers or Ginger Snaps.
Sweet Potato Cheesecake 2 cups Vanilla Wafers crumbs (1/2 pound cookies crushed) 1/3 cup melted butter or margarine 3 8-ounce packages cream cheese, softened 1 cup sugar 1/2 cup light brown sugar 3 eggs, lightly beatened 1 15-ounce can sweet potatoes, drained and pureed 1/4 cup heavy cream 3 teaspoons vanilla 1 teaspoon ground cinnamon 1 1/2 teaspoons ground nutmeg 1 teaspoon fresh lemon juice 2 cups sour cream, at room temperature Heat the oven to 350 degrees.
2 slices bread = 4 grams protein 1 whole bagel, small = 4 grams protein 2/3 cup noodles = 4 grams protein fi cup carrots = 1 gram protein 1 cup broccoli = 2 gram protein 1/2 cup apple juice = 0.5 grams protein 3 Tbsp soft cream cheese, fat-free = 4 grams protein 1/2 cups popcorn = 2 grams protein 5 vanilla wafers = 2 grams protein fi cup fruit cocktail = 0.5 grams protein Total = 24 grams protein Case 2 An 82 kg patient on PD needs 98 to 107 grams of protein.