1N/FDLL 914/A/B / 916/A/B / 4148 / 4448 Small Signal Diode
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1N/FDLL 914/A/B / 916/A/B / 4148 / 4448 Small Signal Diode
January 2007
1N/FDLL 914/A/B / 916/A/B / 4148 / 4448
Small Signal Diode
LL-34 COLOR BAND MARKING DEVICE 1ST BAND 2ND BAND FDLL914 BLACK BROWN FDLL914A BLACK GRAY FDLL914B BROWN BLACK FDLL916 BLACK RED FDLL916A BLACK WHITE FDLL916B BROWN BROWN FDLL4148 BLACK BROWN FDLL4448 BROWN BLACK -1st band denotes cathode terminal and has wider width
LL-34 DO-35
Cathode is denoted with a black band
THE PLACEMENT OF THE EXPANSION GAP HAS NO RELATIONSHIP TO THE LOCATION OF THE CATHODE TERMINAL
Absolute Maximum Ratings T 25 C unless otherwise noted
a
Symbol
VRRM IO IF if IFSM
Parameter
Maximum Repetitive Reverse Voltage Average Rectified Forward Current DC Forward Current Recurrent Peak Forward Current Non-repetitive Peak Forward Surge Current Pulse Width 1.0 second Pulse Width 1.0 microsecond Storage Temperature Range Operating Junction Temperature
Value
100 200 300 400 1.0 4.0 -65 to 200 175
Units
V mA mA mA A A C C
TSTG TJ
These ratings are limiting values above which the serviceability of the diode may be impaired. NOTES: 1) These ratings are based on a maximum junction temperature of 200 degrees C. 2) These are steady state limits. The factory should be consulted on applications involving pulsed or low duty cycle operations.
Thermal Characteristics
Symbol
PD RJA Power Dissipation Thermal Resistance, Junction to Ambient
Parameter
Max.
1N/FDLL 914/A/B / 4148 / 4448 500 300
Units
mW C/W
2007 Fairchild Semiconductor Corporation
1
1N/FDLL 914/A/B / 916/A/B / 4148 / 4448 Rev. B2
1N4148 Datasheet Fairchild Download PDF
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Comments
Measurement Of Temperature
When power transistors are used, they may tend to over heat. Likewise resistors may also overheat in the event of faults or short-circuits. The knowledge of their temperatures may be advantageous. In addition, measurement of temperature constitutes a basic necessity in day-to-day life.
Measuring the temperature of a body, depends upon the establishment of thermo-dynamic equilibrium between the body and the device used to sense the temperature. In practice, this condition is rarely attained since it is difficult to establish complete instantaneous equilibrium. Hence great care must be exercised in choosing a method suited to the problem so that satisfactory conditions for temperature measurements are obtained. Temperature sensors possess thermal characteristics dependent largely on their size and shape and the materials from which they are made. These characteristics affect precise measurements. The introduction of a temperature sensor into a body tends to modify the temperature conditions at that point. In most cases the sensor is connected to a recording instrument by means of an intermediate system, along which the signal is carried. The intermediate system and the recorder may be subject to temperature and other changes. Hence compensating devices become a necessity to reduce or eliminate errors.
The measurement of temperature in our instrument depends on the fact that the forward voltage drop of a silicon diode changes by about - 2 millivolts per degree centigrade. Thus, by measuring the change in forward voltage of silicon diode kept in a temperature probe, the voltage drop can be converted into temperature.
http://www.elecfree.com/electronic/diode-thermometer-by-1n4148/
This page demonstrates how to install front, rear and under car lights in a Kyosho Mini-Z car.
For this example I modified a Kyosho Mini-Z AWD, VW Golf R32.
The modification includes two white front LED's, two red rear LED's, and two bars with 4 blue LED's each and a simple electronic circuit to keep the lights on without flickering or changing brightness.
The circuit is active while driving forward or backward and braking. There is an additional short delay (actual 3s) after the motor stopped and before lights turn off automatically. Delay time can be changed by values of R2 and C2. See schematic for calculation.
A simple NE555 timer working as monoflop is used to drive the LED's lights by a power MOSFET. The 555 creates the delay and keeps the lights on independent of motor speed and direction.
http://www.mictronics.de/?page=mini_z
To encounter an electric cable when drilling a hole in a wall can have catastrophic consequences. Likewise to drill into water pipes or central heating pipes can cause major problems. That is to say nothing of course if one has the misfortune to drill into a gas pipe.
Now with a handy metal detector it is possible to check for metal objects in and behind walls floors and ceilings. An LED turns on if the detector comes into the vicinity of metal objects.
http://www.all-science-fair-projects.com/science-fair-projects-kits/scie...
SMT-YOU CAN WORK WITH IT PART 4
SMT-YOU CAN WORK WITH IT PART 4