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1N5267B  
1N5221B THRU  
WILLAS  
Silicon Z–Diodes  
Unit: inch (mm)  
.022(0.55)  
.018(0.45)  
DO-35  
Features  
1.02(26.0)  
MIN.  
Plannar Die constuction  
500mW Power Dissipation  
Ideally Suited for Automated Assembly Processes  
.153(3.6)  
.132(3.0)  
V –tolerance ± 5%  
Z
Applications  
.087(2.2)  
.067(1.7)  
Voltage stabilization  
1.02(26.0)  
MIN.  
MECHANICAL DATA  
Approx. Weight:  
0.136 grams  
Absolute Maximum Ratings  
T = 25 C  
j
Parameter  
Power dissipation  
Z–current  
Junction temperature  
Storage temperature range  
est Conditions  
=25 C  
amb  
Type  
Symbol  
Value  
500  
Unit  
mW  
mA  
C
T
P
TOT  
T
I
Z
P /V  
V
Z
T
175  
–65...+175  
j
T
stg  
C
Maximum Thermal Resistance  
T = 25 C  
j
Parameter  
Junction ambient  
Test Conditions  
l=9.5mm (3/8”), T =constant  
Symbol  
R
thJA  
Value  
300  
Unit  
K/W  
L
Electrical Characteristics  
T = 25 C  
j
Parameter  
Forward voltage  
Test Conditions  
I =200mA  
Type  
Symbol Min  
Typ Max Unit  
1.1  
V
F
V
F
2010.06  
WILLS ELECTRONIC CORP.  
1N5221B  
THRU 1N5267B  
WILLAS  
500 mWatts Zener Diodes  
Max Reverse  
Leakage Current  
IR @ VR  
Nominal Zener Voltage  
Max. Zener Impedance  
TK  
Marking  
Code  
Part No.  
VZ @ IZT  
ZZT @ IZT  
mA  
ZZK @ IZK  
VZ  
Nom. V  
2.4  
Min. V  
2.28  
Max. V  
2.52  
Ω
30  
30  
30  
30  
29  
28  
24  
23  
22  
19  
17  
11  
7
Ω
mA  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
μA  
100  
100  
75  
V
%/K  
1N5221B  
1N5222B  
1N5223B  
1N5224B  
1N5225B  
1N5226B  
1N5227B  
1N5228B  
1N5229B  
1N5230B  
1N5231B  
1N5232B  
1N5233B  
1N5234B  
1N5235B  
1N5236B  
1N5237B  
1N5238B  
1N5239B  
1N5240B  
1N5241B  
1N5242B  
1N5243B  
1N5244B  
1N5245B  
1N5246B  
1N5247B  
1N5248B  
1N5249B  
1N5250B  
1N5251B  
1N5252B  
1N5253B  
1N5254B  
1N5255B  
1N5256B  
1N5257B  
1N5258B  
1N5259B  
1N5260B  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
20.0  
9.5  
1200  
1250  
1300  
1400  
1600  
1600  
1700  
1900  
2000  
1900  
1600  
1600  
1600  
1000  
750  
1.0  
< -0.085  
< -0.085  
< -0.080  
< -0.080  
< -0.075  
< -0.070  
< -0.065  
< -0.060  
<+0.050  
<+0.030  
<+0.030  
<+0.038  
<+0.038  
<+0.045  
<+0.050  
<+0.058  
<+0.062  
<+0.065  
<+0.068  
<+0.075  
<+0.076  
<+0.077  
<+0.079  
<+0.082  
<+0.082  
<+0.083  
<+0.084  
<+0.085  
<+0.086  
<+0.086  
<+0.087  
<+0.088  
<+0.089  
<+0.090  
<+0.091  
<+0.091  
<+0.092  
<+0.093  
<+0.094  
<+0.095  
1N5221B  
1N5222B  
1N5223B  
1N5224B  
1N5225B  
1N5226B  
1N5227B  
1N5228B  
1N5229B  
1N5230B  
1N5231B  
1N5232B  
1N5233B  
1N5234B  
1N5235B  
1N5236B  
1N5237B  
1N5238B  
1N5239B  
1N5240B  
1N5241B  
1N5242B  
1N5243B  
1N5244B  
1N5245B  
1N5246B  
1N5247B  
1N5248B  
1N5249B  
1N5250B  
1N5251B  
1N5252B  
1N5253B  
1N5254B  
1N5255B  
1N5256B  
1N5257B  
1N5258B  
1N5259B  
1N5260B  
2.5  
2.38  
2.63  
1.0  
2.7  
2.57  
2.84  
1.0  
2.8  
2.66  
2.94  
75  
1.0  
3.0  
2.85  
3.15  
50  
1.0  
3.3  
3.14  
3.47  
25  
1.0  
3.6  
3.42  
3.78  
15  
1.0  
3.9  
3.71  
4.10  
10  
1.0  
4.3  
4.09  
4.52  
5.0  
5.0  
5.0  
5.0  
5.0  
5.0  
3.0  
3.0  
3.0  
3.0  
3.0  
3.0  
2.0  
1.0  
0.5  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
1.0  
4.7  
4.47  
4.94  
2.0  
5.1  
4.85  
5.36  
2.0  
5.6  
5.32  
5.88  
3.0  
6.0  
5.70  
6.30  
3.5  
6.2  
5.89  
6.51  
7
4.0  
6.8  
6.46  
7.14  
5
5.0  
7.5  
7.13  
7.88  
6
500  
6.0  
8.2  
7.79  
8.61  
8
500  
6.5  
8.7  
8.27  
9.14  
8
600  
6.5  
9.1  
8.65  
9.56  
10  
17  
22  
30  
13  
15  
16  
17  
19  
21  
23  
25  
29  
33  
35  
41  
44  
49  
58  
70  
80  
93  
600  
7.0  
10.0  
11.0  
12.0  
13.0  
14.0  
15.0  
16.0  
17.0  
18.0  
19.0  
20.0  
22.0  
24.0  
25.0  
27.0  
28.0  
30.0  
33.0  
36.0  
39.0  
43.0  
9.50  
10.50  
11.55  
12.60  
13.65  
14.70  
15.75  
16.80  
17.85  
18.90  
19.95  
21.00  
23.10  
25.20  
26.25  
28.35  
29.40  
31.50  
34.65  
37.80  
40.95  
45.15  
600  
8.0  
10.45  
11.40  
12.35  
13.30  
14.25  
15.20  
16.15  
17.10  
18.05  
19.00  
20.90  
22.80  
23.75  
25.65  
26.60  
28.50  
31.35  
34.20  
37.05  
40.85  
600  
8.4  
600  
9.1  
600  
9.9  
9.0  
600  
10.0  
11.0  
12.0  
13.0  
14.0  
14.0  
15.0  
17.0  
18.0  
19.0  
21.0  
21.0  
23.0  
25.0  
27.0  
30.0  
33.0  
8.5  
600  
7.8  
600  
7.4  
600  
7.0  
600  
6.6  
600  
6.2  
600  
5.6  
600  
5.2  
600  
5.0  
600  
4.6  
600  
4.5  
600  
4.2  
600  
3.8  
700  
3.4  
700  
3.2  
800  
3.0  
900  
2010.08  
WILLS ELECTRONIC CORP.  
1N5221B  
THRU 1N5267B  
WILLAS  
500 mWatts Zener Diodes  
Nominal Zener Voltage  
Max Reverse  
Leakage Current  
Max. Zener Impedance  
ZZT @ IZT ZZK @ IZK  
TK  
Marking  
Code  
Part No.  
VZ @ IZT  
IR @ VR  
VZ  
Nom. V  
47.0  
Min. V  
44.65  
48.45  
53.20  
57.00  
58.90  
64.60  
71.25  
Max. V  
49.35  
53.55  
58.80  
63.00  
65.10  
71.40  
78.75  
Ω
mA  
2.7  
2.5  
2.2  
2.1  
2.0  
1.8  
1.7  
Ω
mA  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
μA  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
V
%/K  
1N5261B  
1N5262B  
1N5263B  
1N5264B  
1N5265B  
1N5266B  
1N5267B  
150  
125  
150  
170  
185  
230  
270  
1000  
1100  
1300  
1400  
1400  
1600  
1700  
36.0  
<+0.095  
<+0.096  
<+0.096  
<+0.097  
<+0.097  
<+0.097  
<+0.098  
1N5261B  
1N5262B  
1N5263B  
1N5264B  
1N5265B  
1N5266B  
1N5267B  
51.0  
39.0  
43.0  
46.0  
47.0  
52.0  
56.0  
56.0  
60.0  
62.0  
68.0  
75.0  
1)  
Based on dc–measurement at thermal equilibrium; lead length = 9.5mm (3/8”); thermal resistance of heat sink = 30K/W  
RATING AND CHARACTERISTIC CURVES  
500  
400  
300  
200  
100  
0
50  
100  
150  
200  
250  
AMBIENT TEMPERATURE, OC  
FIG. 1 POWER DERATING CURVE  
Vz (V)  
30  
5
10  
15  
20  
25  
50  
40  
30  
Test Current  
Iz = 20mA  
20  
10  
0
Fig.2 BREAKDOWN CHARACTERISTICS  
2010.08  
WILLS ELECTRONIC CORP.