參數(shù)資料
型號(hào)： VT900
廠商： PerkinElmer Inc.
英文描述： Photoconductive Cells and Analog Optoisolators (Vactrols)
中文描述： 光導(dǎo)細(xì)胞和模擬光隔離器（Vactrols）
文件頁(yè)數(shù)： 72/76頁(yè)
文件大?。?/td> 1240K
代理商： VT900
67
Application Notes—Analog Optical Isolators
APPLICATION NOTE #2
Handling andSoldering AOIs
All opto components must be handled and soldered with care,
especially those that use a cast or molded plastic and lead frame
construction like the LEDs used in AOIs.
In LED lead frame construction, the emtter chip is mounted directly to
one lead and a wire bond is made fromthe chip to the other lead. The
encapsulating plastic is the only support for the lead frame. Care must
be taken when formng the leads of plastic opto packages. Excessive
mechanical force can cause the leads to move inside the plastic
package and damage the wire bonds. Weakened bonds can then
“open up” under further mechanical or thermal stressing, producing
open circuits.
In order to formleads safely, it is necessary to firmy lamp the leads
near the base of the package in order not to transfer any force
(particularly tension forces) to the plastic body. This can be
accomplished either through use of properly designed tooling or by
firmy gripping the leads below the base of the package with a pair of
needle nose pliers while the leads are being bent.
Examples of Tooling Fixtures Used to FormLeads
For highest reliability, avoid flush mounting the AOI body on the printed
circuit board. This mnimzes mechanical stress set up between the
circuit board and the LED and photocell packages. It also reduces
solder head damage to the packages.
Good printed circuit board layout avoids putting any spreading (plastic
under tension) force on the leads of the LED and photocell.
When hand soldering, it is important to limt the maximumtemperature
of the iron by controlling the power. It is best if a 15W or 25W iron is
used. The maximumrecommended lead soldering temperature (1/16"
fromthe case for 5 seconds) is 260°C. An RMA rosin core solder is
recommended.
Sn60 (60% tin / 40% lead) solder is recommended for wave soldering
opto components into printed circuit boards. Other alternatives are
Sn62 and Sn63. The maximumrecommended soldering temperature
is 260°C with a maximumduration of 5seconds.
The amount of tarnish on the leads determnes the type of flux to use
when soldering devices with silver plated leads.
Cleaners designed for the removal of tarnish fromthe leads of
electronic components are acidic and it is best to keep the immersion
time as short as possible (less than 2 seconds) and to immediately
wash all devices thoroughly in ten rinses of deionized water.
Condition of Leads
Recommended Flux
Clear Bright Finish
(Tarnish Free)
Dull Finish
(Minimal Tarnish)
Light Yellow Tint
(Mild Tarnish)
Light Yellow / Tan Color
(Moderate Tarnish)
Dark Tan / Black Color
(Heavy Tarnish)
RMA - Mldly Activated
RMA - Mldly Activated
RA - Activated
AC - Water Soluble,
Organic Acid Flux
Leads Need to be Cleaned
Prior to Soldering
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