TOTX1951(F)
2012-04-13
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FIBER OPTIC TRANSMITTING MODULE
TOTX1951(F)
GENERAL PURPOSE OPTICAL TRANSMITTING MODULE
z Data rate：DC to 6Mb／s (NRZ code)
z Transmission distance：Up to 50m (Using TORX1951(F) and APF)
z For JIS F05 Optical Connector
z TTL interface
z LED is driven by differential circuit.
z 650 nm LED
1. Absolute Maximum Ratings (Ta = 25°C)
Characteristics Symbol Rating Unit
Storage Temperature Tstg −40 to 85 °C
Operating Temperature Topr −40 to 85 °C
Supply Voltage VCC −0.5 to 6 V
Input Voltage VIN −0.5 to VCC + 0.5 V
Soldering Temperature Tsol 260 (Note 1) °C
Note 1: Soldering time ≤ 10 seconds (At a distance of 1 mm from the package).
Using continuously heavy loads (e.g. the application of high temperature/current/voltage and the significant
change in temperature , etc) may cause this product to decrease in the reliability significantly even if the
operating conditions (i.e.operating temperature/ current/ voltage, etc.) are within the absolute maximum ratings.
Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook
(“Handling Precautions”/ “Derating Concept and Methods”) and individual reliability data (i.e. reliability test report and
estimated failure rate, etc).
2. Operating Ranges
Characteristics Symbol Min Typ. Max Unit
Supply Voltage VCC 4.75 5.0 5.25 V
High Level Input Voltage VIH 2.0 - VCC V
Low Level Input Voltage VIL 0 - 0.8 V
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3. Electrical and Optical Characteristics (Ta = 25°C, VCC = 5 V)
Characteristics Symbol Test Condition Min Typ. Max Unit
Data Rate NRZ Code(Note 2) DC - 6 Mb / s
Transmission Distance Using APF (Note 3) and TORX1951(F) 0.2 - 40 m
Pulse Width Distortion (Note 4) Δtw
Using APF and TORX1951(F)
Pulse width 165 ns
Pulse cycle 330 ns, CL = 10 pF
−55 - 55 ns
Fiber Output Power (Note 5) Pf R = 1.2kΩ −15 - − 9 dBm
Center Emission Wavelength λc - 650 - nm
Current Consumption ICC R = 1.2kΩ - 25 40 mA
High Level Input Voltage VIH 2.0 - - V
Low Level Input Voltage VIL - - 0.8 V
High Level Input Current IIH VI=2.7V - - 20 μA
Low Level Input Current IIL VI=0.4V - - −0.4 mA
Note 2: LED is on when input signal is high level, it is off when low level.
The duty factor must be kept 25 to 75%.
Note 3: All Plastic fiber (980 / 1000μm, NA=0.5) with polished surface.
Note 4: Between input of TOTX1951(F) and output of TORX1951(F).
Note 5: Measure with a standard optical fiber with fiber optic connectors. Valued by peak.
4. Application Circuit
Note 6: Select a resistor value as follows: (With TORX1951(F))
Fiber Optic Connector
Type Name
Transmission
Distance
(m)
Resistor
(Ω)
F05 type Optical connector
APF(980 / 1000μm) with polished surface.
0.2 to 40 1.2k
5. Applicable Optical Fiber with Fiber Optic Connectors
All Plastic Fiber (980μm core / 1000μm cladding). NA=0.5.
F05 type optical connector with polished surface.
C：0.1μF
R Ω
(Note 6)
Within 7mm
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6. Precautions during use
(1) 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.
(2) Operating Range
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.
(3) 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.
(4) 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 a protective cap. The protective cap 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.
(5) Vibration and shock
This module is plastic sealed and has its wire fixed by resin. This structure is relatively resistant to vibration
and shock. In actual equipment, there are sometimes cases in which vibration, shock, or stress is applied
to soldered parts or connected parts, resulting in lines cut. A care must be taken in the design of equipment
which will be subject to high levels of vibration.
(6) Attaching the fiber optic transmitting module
Solder the fixed pin (pins 4 and 5) of the fiber optic transmitting module TOTX1951(F) to the printed circuit
board in order to fix it to the board.
(7) Solvent
When using solvent for flux removal, do not use a high acid or high alkali solvent. Be careful not to pour
solvent in to the optical connector ports. If solvent is inadvertently poured in to them, clean it off using
cotton tips.
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(8) Protective cap
When the TOTX1951(F) is not in use, attach the protective cap.
(9) Supply voltage
Use the supply voltage within the operating range (VCC = 5 ± 0.25 V). Make sure that supply voltage does
not exceed the absolute maximum rating value of 6 V, even for an instant.
(10) Input voltage
If a voltage exceeding the absolute maximum rating value (VCC + 0.5 V) is applied to the transmitters'
input, the internal IC may suffer damage. If there is a possibility that excessive voltage due to surges may
be added to the input terminal, insert a protective circuit.
(11) Soldering condition
Solder at 260°C or less for no more than ten seconds.
(12) Incidence of a photo Flash
If strong light such as a photo flash is incident on an optical module, a transmission error may occur.
Be careful to avoid such situations.
(13) Precautions when disposing of devices and packing materials.
When disposing devices and packing materials, follow the procedures stipulated by local regulations in
order to protect the environment against contamination.
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7. Package Outline drawing
Unit: mm
Pin connection
1.GND
2.Current limiting
resistor of LED
3.Vcc
4.Input
5.N.C.
6.N.C
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