Surface Mount Packages (SMD). Reference data

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Surface Mount Packages (SMD). Reference data

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In order to correctly perceive and use the presented material about SMD, you must familiarize yourself with the following information:

The dimensions of the cases are very important, since outwardly many cases are similar to each other, and to identify the device, it is necessary to know not only the marking, but also the type of the case. But that may not save you either. So, the SOD80 case from PHILIPS has a diameter of 1.6 mm (nom.), and the case with the same name from a number of other companies has a diameter of 1.4 mm, which is even smaller than the diameter of another, more compact case from PHILIPS SOD80C. The SGS-Thomson SOD15 housing is very similar to, but does not match the 7043 and SMC housings in terms of mounting dimensions (see Table 2 in the Surface Mount (SMD) Housings chapter).
There are situations when manufacturing companies place different devices in the same case under the same marking. For example, PHILIPS puts a BC323W npn transistor in a SOT818 package and labels it with the 6H code, and MOTOROLA puts a MUN6T5131 pnp transistor in the same package marked 1H. The same situation occurs within the same firm. For example, SIEMENS in a SOT23 package under the marking 1A produces BC846A and SMBT3904 transistors with different parameters. It is possible to distinguish such devices installed on the board only by the components surrounding them and, accordingly, by the switching circuit.
Confusion exists not only with the marking, but also with the pinout of the cases. For example, a SOT-89 case from ROHM, SIEMENS, TOSHIBA has a 1-2-3 pinout (top view), while for PHILIPS the same case has a 2-3-1 or 3-2-1 pinout. In this book, the numbers of conclusions and their functional significance for different firms are brought to a common denominator.
The situation is no better with passive components for surface mounting. If the case is labeled 103 (see chapter "Surface Mount Packages (SMD)"), it can be a 10 kΩ resistor, a 10 nF capacitor, or a 10 mH inductor. If the case is marked 2R2, then it can be a resistor with a nominal value of 2.2 Ohm, and a capacitor with a capacitance of 2.2 pF. Code 107 can mean 0.1 ohm (Philips) or 100uF (Panasonic).
In cases like 0603, 0805 etc. without marking, there may be a capacitor, inductance or jumper resistor (Zero-Ohm, jumper).
A colored stripe or key notch on SOD 123, D0215 cases may indicate the cathode of the diode or the positive terminal of the electrolytic capacitor.
In appearance, it is very difficult to distinguish R, C and L from each other if they are in cylindrical cases with leads and are marked with colored rings. But even after identification, it may be difficult to determine its parameters. For example, in practice, several methods are used for color marking fixed capacitors (see the chapter "Capacitors. Color marking").
In exactly the same cases with the same color code, a whole series of devices with different parameters can be produced. For example, MOTOROLA manufactures a whole series of zener diodes (80 devices) with a stabilization voltage from 51 to 1.8 V and a current from 100 to 0.1 A in the SOD1.7 type package, marked with one color ring. In the same package, PHILIPS produces a series of diodes.
It is necessary to correctly determine the color of the marking itself. In practice, there may be difficulties with the difference between the following shades:
gray - St. blue - silver;
blue - turquoise - electrician;
yellow - golden;
orange - St. brown - tobacco - beige.
The black ring in the middle of the case can have not only jumper resistors (Zero-Ohm, jumper), but also other devices, especially taking into account the technological variation when marking.
Many firms, in addition to the marking principles specified in the Publications of the International Electrotechnical Commission (IEC), use their own intra-company color and code markings. For example, there is a marking of SMD resistors when a colon is placed instead of the number 8. In such cases, the marking 1:23 means 182 kOhm, and :0R6 - 80.6 Ohm.
Cases of the SOT (SOD) type - Small Outline Transistor (Diode) - literally translated means "transistor (diode) with small leads". At the present stage, not only transistors and diodes are placed in SOT cases, but also transistors with resistors, zener diodes, voltage stabilizers based on an operational amplifier, and much more, and the number of pins can be more than three. Standardization bodies do not keep up with the new developments of firms, and they are forced to introduce their new designations. For more information, see the "Enclosures" chapter.

Publication: cxem.net

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