totx177apl TOSHIBA Semiconductor CORPORATION, totx177apl Datasheet - Page 3

• Manufacturer Part Number: totx177apl
• Description: Fiber Optic Transmitting Module For Digital Audio Equipment
• Manufacturer: TOSHIBA Semiconductor CORPORATION

7. Board layout hole pattern
8. Precautions during use
5.6 TYP.
2−φ1.7±0.05
(1)
(3)
(4)
(2) Operating Range
Absolute maximum rating
The absolute maximum ratings are the limit values which must not be exceeded during operation of device.
None of these rating value must not be exceeded. If the absolute maximum rating value is exceeded, the
characteristics of devices may never be restored properly. In extreme cases, the device may be
permanently damages.
The operating range is the range of conditions necessary for the device to operate as specified in
individual technical datasheets and databooks. Care must be exercised in the design of the equipment. If a
device is used under conditions that do not exceed absolute maximum ratings but exceed the operating
range, the specifications related to device operation and electrical characteristics may not be met, resulting
in a decrease in reliability.
If greater reliability is required, derate the device’s operating ranges for voltage, current, power and
temperature before use.
Lifetime of light emitters
If an optical module is used for a long period of time, degeneration in the characteristics will mostly be due
to a lowering of the fiber output power (Pf). This is caused by the degradation of the optical output of the
LEDs used as the light source. The cause of degradation of the optical output of the LEDs may be defects
in wafer crystallization or mold resin stress. The detailed causes are, however, not clear.
The lifetime of light emitters is greatly influenced by the operating conditions and the environment in which
it is used as well as by the lifetime characteristics unique to the device type. Thus, when a light emitting
device and its operating conditions determined, Toshiba recommend that lifetime characteristics be
checked.
Depending on the environment conditions, Toshiba recommend that maintenance such as regular checks
of the amount of optical output in accordance with the condition of operating environment.
Soldering
Optical modules are comprised of internal semiconductor devices. However, in principle, optical modules
are optical components. During soldering, ensure that flux does not contact with the emitting surface or the
detecting surface. Also ensure that proper flux removal is conducted after soldering.
Some optical modules come with shutter system. The shutter system is used to avoid malfunction when
the optical module is not in use. Note that it is not dust or waterproof.
As mentioned before, optical modules are optical components. Thus, in principle, soldering where there
may be flux residue and flux removal after soldering is not recommended. Toshiba recommend that
soldering be performed without the optical module mounted on the board. Then, after the board has been
cleaned, the optical module should be soldered on to the board manually.
If the optical module cannot be soldered manually, use non- halogen (chlorine- free) flux and make sure,
without cleaning, there is no residue such as chlorine. This is one of the ways to eliminate the effects of
flux. In such a cases, be sure to check the devices’ reliability.
2.61 TYP.
(Recommendation)
2−φ1.1±0.05
3−φ0.8±0.05
2.625 TYP.
3
2.54 TYP.
2.54 TYP.
Unit：mm
Recommended PCB thickness：1.6mm
TOTX177APL(F,T)
2010-08-30