Transistoren:

6C: BC817-40 	Gehäuse: 	SOT 23	Vergleichstyp:	BC337-40

Z3: BZX84-C5V6 	Gehäuse:	SOT 23	Vergleichstyp:	BZX79 C5V6 

Widerstände und Kondensatoren:

SMD - Zweizeichen Code
1.  Buchstabe
A = 1,0 
B = 1,1 
C = 1.2 
D = 1,3 
E = 1,5 
F = 1,6 
G = 1,8 
H = 2,0 
I = 2,2 
K = 2,4 
L = 2,7 
M = 3,0 
O = 3,3 
P = 3,6 
Q = 3,9 
R = 4,3 
S = 4,7 
T = 5,1 
U = 5,6 
V = 6,2 
W = 6,8 
X = 7,5 
Y = 8,2 
Z = 9,1 
a = 2,5 
b = 3,5 
d = 4,0 
e = 4,5 
f = 5,0 
m = 6,0 
n = 7,0 
t = 8,0 
y = 9,0 

2. Zahl (Multiplikator)
0 =                   1 
1 =                 10 
2 =               100 
3 =            1.000 
4 =          10.000 
5 =        100.000 
6 =     1.000.000 
7 =   10.000.000 
8 = 100.000.000 
9 =                   0,1 

3. Beispiel
W4 = 68 k Ohm  oder 68 nF

A1 = 10 Ohm oder 10 pF




SMD Ceramic Capacitor Coding

SMD ceramic capacitors are sometimes marked with a code, consisting of one or two letters and a digit. The first letter if present is a manufacturer code (i.e K for Kemet, etc.), the second letter the mantissa and the digit the exponent (multiplier) of the capacitance in pF. For example S3 is a 4.7nF (4.7 x 10³ pf) capactitor from an unknown manufacturer, while KA2 is a 100 pF (1.0 x 10² pF) capacitor from Kemet. Thanks to K7ITM for providing this information!

Letter Mantissa Letter Mantissa Letter Mantissa Letter Mantissa 
A 1.0 J 2.2 S 4.7 a 2.5 
B 1.1 K 2.4 T 5.1 b 3.5 
C 1.2 L 2.7 U 5.6 d 4.0 
D 1.3 M 3.0 V 6.2 e 4.5 
E 1.5 N 3.3 W 6.8 f 5.0 
F 1.6 P 3.6 X 7.5 m 6.0 
G 1.8 Q 3.9 Y 8.2 n 7.0 
H 2.0 R 4.3 Z 9.1 t 8.0 
      y 9.0 


SMD Resistor Coding

SMD Resistors are usually coded with a numerical equivalent of the familiar three band colour code. In the same way as wire ended components, precision resistors (1% or better) may be marked with a four digit code.
The first two (or 3) digits are the first two (or 3) digits of the resistance in ohms, and the third(or 4th) is the number of zeros to follow - the 'multiplier'.
Resistances of less than 10 ohms have a 'R' to indicate the position of the decimal point.

Some examples will meake this clearer:

Three Digit Examples 			Four Digit Examples 
330 is 33 ohms - not 330 ohms 		1000 is 100 ohms - not 1000 ohms 
221 is 220 ohms 			4992 is 49900 ohms, or 49.9 kohm 
683 is 68000 ohms, or 68 kohm  		16234 is 162000 ohms, or 162 kohm 
105 is 1000000 ohms, or 1 Mohm   
8R2 is 8.2 ohms 			0R56 or R56 is 0.56 ohms