TO-251

Vehicle-grade diodes, abbreviated as LEDs, refer to a kind of semiconductor diodes made of compounds containing gallium (Ga), arsenic (As), phosphorus (P), nitrogen (N), etc., which can convert electrical energy into light energy.

When electrons and holes recombine, they can radiate visible light, so they can be used to make automotive-grade diodes. Used as indicator lights in circuits and instruments, or composed of text or digital displays. Gallium arsenide diodes emit red light, gallium phosphide diodes emit green light, silicon carbide diodes emit yellow light, and gallium nitride diodes emit blue light. Due to the chemical properties, it is divided into locomotive-grade diode OLED and non-vehicle-grade diode LED. Let's learn how to distinguish the positive and negative poles of automotive-grade diodes.

Use the multimeter R×1K gear, the red and black test leads are alternately connected to the two leads of the automotive-grade diode. When one of the measurements is found, the gauge first swings a certain distance to the right, and then the gauge begins to vibrate slightly (oscillation) at this position. The swing range is about a small grid. This phenomenon shows that the integrated circuit inside the car-grade diode starts to oscillate under the action of the 1.5V battery voltage inside the multimeter, and the output pulse current makes the pointer jitter, just because the voltage is too low to make the car-grade diode emit light. However, this phenomenon shows that the connection method of the red and black test leads of the multimeter is correct, that is, the black test lead of the multimeter is connected to the anode of the car-grade diode.

Note: When judging the positive and negative poles of a car-grade diode, do not think that the black test pen is connected to the positive pole of the diode in the measurement with a small resistance, as with ordinary diodes.

What about the positive and negative poles of a car-grade diode? In fact, it is very simple. For a car-grade diode, the long leg is positive and the short leg is negative. If the feet are the same length, the larger point in the car-grade diode is the negative electrode, and the smaller one is the positive electrode. In the multimeter: the red test lead is connected to "+", and the black test lead is connected to "-". When testing a car-grade diode, the low-resistance gear cannot be measured. It can be measured in the RX10K gear. The two test pens are in contact with the two poles of the diode. If the resistance is small, the black test pen is connected to the positive pole. The resistance is large. The black test pen is connected to the negative pole. Vehicle-grade diodes, if used in conjunction with TTL components, generally need to be connected in series with a 470Ω step-down resistor to prevent damage to the device.

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