MIAMI Raltron Electronics Corp. has introduced a family of surface-mount metal-can quartz crystal units, the AS-XXD, positioned as available alternatives to similar units normally delivered in plastic and ceramic packages. Those two package types are currently in short supply.
Neither plastic nor ceramic packaging is likely to become plentiful in the near future, according to the company, whose new family of quartz crystals is derived from its AS-SMD metal-can crystal unit.
The AS-XXD's flexible footprint emulates those of plastic and ceramic packages in standard pinouts. The crystals, at 3.2 MHz to 70 MHz, are delivered in one-fourth the time needed for delivery of the scarcer materials.
The family comprises five pinout configurations in the common HC-49 low-profile metal package. All members are dimensionally and electrically identical but are fitted with a selection of different surface-mount pad inserts on the bottom.
Low-profile AS-XXD family members are fabricated with common AT or BT strip crystals in 4.9-mm-high metal cans. Separate internal connections and pinout configurations are employed.
To produce each of the new family members, the company varies the pinout pad configurations by using different bottom inserts in the parts. The pinouts are all industry-standard, so the crystals are said to be easy to use in a variety of computers and peripherals, telecommunications, wireless products, pagers and telephones.
They are delivered for high-volume, pick-and-place surface-mount manufacturing on 24-mm-wide reels, 330 mm in diameter, with 1,000 units per reel.
Standard frequency tolerance at 25 degrees C is 50 ppm max. Standard operating temperature range is -20 degrees C to 70 degrees C. All AS-XXD family members are available with optional high-stability specs (plus 30 ppm over the full temperature range) and extended operating range (-40 degrees C to 85 degrees C).
The storage temperature range is -55 degrees C to 125 degrees C. The drive level is 0.1 milliwatt typical, and the load capacitance is 32 picofarads maximum. Aging is specified at +5 ppm per year maximum.
Unit pricing of the crystals is 65 cents or less in 10,000-piece quantities, depending on the type ordered. Delivery is four to six weeks.
CALL (305) 593-6033
EETInfo No. 618