SPS SMD Diode Rectifiers Identification and Discrimination

Special Sun A·H·M Technology(Shanghai)Co.,Ltd.
SPS - ISO Factory for SMD and Through-hole Diodes and Rectifiers Since 2000

SPS SMD Diode Rectifiers Identification and Discrimination:

1. Model marking and polar braid

The types of SMD diodes are marked with letters, numeric codes or letters + numeric codes and color (code) identification methods. For example, the electrical parameters of the printing "A3" are as follows: PD =0.15W; IF=0.1A; VB= 80V; Trr=4ns. In the color marking method, the model is mainly found by the color marked on the negative side, and then the parameter value is found by the model.

SMD diode polarity discrimination method: glass tube SMD diode, red end is positive, black end is negative; rectangular SMD diode, with white horizontal line end is negative.

2. Good or bad measurement

Normal SMD diode, measured in the road, the forward resistance is small, the reverse resistance is large, and there is a significant difference in resistance between the two. Disconnect the circuit, if measured with a pointer multimeter, the forward resistance is about 3kΩ, and the reverse resistance is hundreds of kiloohms or infinity; if measured with the diode block of the digital multimeter, the forward voltage drops to 0.3 ~ 0.6V, reverse The voltage drop is infinite.

3. Online braid

On the circuit board, the component number of the chip diode generally starts with the letter D, such as D1, D2, etc., or VD, such as VD1, VD2, etc.; or DD, such as DD1, DD2, etc. To distinguish between chip resistors or capacitors with similar shapes, you can use a multimeter to measure them. If their forward and reverse resistance values are different, you can determine that the component is a chip diode.

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