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1N5221B THRU 1N5278B  
www.centralsemi.com  
SILICON ZENER DIODES  
500mW, 2.4 THRU 170 VOLT  
5% TOLERANCE  
DESCRIPTION:  
The CENTRAL SEMICONDUCTOR 1N5221B series  
silicon Zener diodes are highly reliable voltage regulators  
designed for use in industrial, commercial, entertainment  
and computer applications.  
MARKING: Devices shall either be marked with the  
prefix ‘C’ followed by the full part number or by the  
marking code in the Electrical Characteristics Table.  
DO-35 CASE  
MAXIMUM RATINGS: (T =75°C)  
Power Dissipation  
Operating and Storage Junction Temperature  
SYMBOL  
UNITS  
mW  
°C  
%
%
%
L
P
T , T  
500  
-65 to +200  
D
J
stg  
V
V
V
Tolerance: Part number with “B” suffix  
Tolerance: Part number with “C” suffix  
Tolerance: Part number with “D” suffix  
5
2
1
Z
Z
Z
ELECTRICAL CHARACTERISTICS: (T =25°C) V =1.2V MAX @ I =200mA (for all types)  
A
F
F
ZENER  
MAXIMUM  
REVERSE TEMPERATURE  
MAXIMUM  
TEST  
MAXIMUM ZENER  
IMPEDANCE  
VOLTAGE  
CURRENT  
MARKING  
CODE  
COEFFICIENT  
V
@ I  
CURRENT  
TYPE  
Z
ZT  
MIN  
NOM  
MAX  
I
Z
@ I  
Z
@ I  
I
@ V  
V  
ZT  
ZT  
ZT  
ZK  
ZK  
R
R
Z
V
V
V
mA  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
9.5  
9.0  
8.5  
7.8  
Ω
Ω
mA  
μA  
100  
100  
75  
75  
50  
25  
15  
10  
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  
V
%/°C  
-0.085  
-0.085  
-0.080  
-0.080  
-0.075  
-0.070  
-0.065  
-0.060  
0.055  
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  
2.280  
2.375  
2.565  
2.660  
2.850  
3.135  
3.420  
3.705  
4.085  
4.465  
4.845  
5.320  
5.700  
5.890  
6.460  
7.125  
7.790  
8.265  
8.645  
9.500  
10.45  
11.40  
12.35  
13.30  
14.25  
15.20  
2.4  
2.5  
2.7  
2.8  
3.0  
3.3  
3.6  
3.9  
4.3  
4.7  
5.1  
5.6  
6.0  
6.2  
6.8  
7.5  
8.2  
8.7  
9.1  
10  
2.520  
2.625  
2.835  
2.940  
3.150  
3.465  
3.780  
4.095  
4.515  
4.935  
5.355  
5.880  
6.300  
6.510  
7.140  
7.875  
8.610  
9.135  
9.555  
10.50  
11.55  
12.60  
13.65  
14.70  
15.75  
16.80  
30  
30  
30  
30  
29  
28  
24  
23  
22  
19  
17  
11  
7.0  
7.0  
5.0  
6.0  
8.0  
8.0  
10  
1200  
1250  
1300  
1400  
1600  
1600  
1700  
1900  
2000  
1900  
1600  
1600  
1600  
1000  
750  
500  
500  
600  
600  
600  
600  
600  
600  
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  
1.0  
1.0  
1.0  
1.0  
1.0  
1.0  
1.0  
1.0  
1.0  
2.0  
2.0  
3.0  
3.5  
4.0  
5.0  
6.0  
6.5  
6.5  
7.0  
8.0  
8.4  
9.1  
9.9  
10  
C5221B  
C5222B  
C5223B  
C5224B  
C5225B  
C5226B  
C5227B  
C5228B  
C5229B  
C5230B  
C5231B  
C5232B  
C5233B  
C5234B  
C5235B  
C5236B  
C5237B  
C5238B  
C5239B  
C5240B  
C5241B  
C5242B  
C5243B  
C5244B  
C5245B  
C5246B  
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  
17  
22  
30  
13  
15  
16  
17  
11  
12  
13  
14  
15  
16  
600  
600  
600  
11  
12  
R5 (8-May 2020)  
1N5221B THRU 1N5278B  
SILICON ZENER DIODES  
500mW, 2.4 THRU 170 VOLT  
5% TOLERANCE  
ELECTRICAL CHARACTERISTICS - Continued: (T =25°C) V =1.2V MAX @ I =200mA (for all types)  
A
F
F
ZENER  
MAXIMUM  
MAXIMUM  
TEST  
MAXIMUM ZENER  
IMPEDANCE  
VOLTAGE  
REVERSE TEMPERATURE  
CURRENT  
MARKING  
CODE  
COEFFICIENT  
V
@ I  
CURRENT  
TYPE  
Z
ZT  
MIN  
NOM  
MAX  
I
Z
@ I  
Z
@ I  
I
@ V  
V  
ZT  
ZT  
ZT  
ZK  
ZK  
R
R
Z
V
V
17  
18  
19  
20  
22  
24  
25  
27  
28  
30  
33  
36  
39  
43  
47  
51  
56  
60  
62  
68  
75  
82  
87  
91  
100  
110  
120  
130  
140  
150  
160  
170  
V
mA  
7.4  
7.0  
6.6  
6.2  
5.6  
5.2  
5.0  
4.6  
4.5  
4.2  
3.8  
3.4  
3.2  
3.0  
2.7  
2.5  
2.2  
2.1  
2.0  
1.8  
1.7  
1.5  
1.4  
1.4  
1.3  
1.1  
1.0  
0.95  
0.90  
0.85  
0.80  
0.74  
Ω
Ω
mA  
μA  
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  
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  
V
%/°C  
1N5247B  
1N5248B  
1N5249B  
1N5250B  
1N5251B  
1N5252B  
1N5253B  
1N5254B  
1N5255B  
1N5256B  
1N5257B  
1N5258B  
1N5259B  
1N5260B  
1N5261B  
1N5262B  
1N5263B  
1N5264B  
1N5265B  
1N5266B  
1N5267B  
1N5268B  
1N5269B  
1N5270B  
1N5271B  
1N5272B  
1N5273B  
1N5274B  
1N5275B  
1N5276B  
1N5277B  
1N5278B  
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  
44.65  
48.45  
53.20  
57.00  
58.90  
64.60  
71.25  
77.90  
82.65  
86.45  
95.00  
104.5  
114.0  
123.5  
133.0  
142.5  
152.0  
161.5  
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  
49.35  
53.55  
58.80  
63.00  
65.10  
71.40  
78.75  
86.10  
91.35  
95.55  
105.0  
115.5  
126.0  
136.5  
147.0  
157.5  
168.0  
178.5  
19  
21  
23  
25  
29  
33  
35  
41  
44  
49  
58  
70  
80  
93  
105  
125  
150  
170  
185  
230  
270  
330  
370  
600  
600  
600  
600  
600  
600  
600  
600  
600  
600  
700  
700  
800  
900  
1000  
1100  
1300  
1400  
1400  
1600  
1700  
2000  
2200  
2300  
2600  
3000  
4000  
4500  
4500  
5000  
5500  
5500  
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  
13  
14  
14  
15  
17  
18  
19  
21  
21  
23  
25  
27  
30  
33  
36  
39  
43  
46  
47  
52  
56  
62  
68  
69  
76  
84  
91  
99  
106  
114  
122  
129  
+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  
+0.095  
+0.096  
+0.096  
+0.097  
+0.097  
+0.097  
+0.098  
+0.098  
+0.099  
+0.099  
+0.110  
+0.110  
+0.110  
+0.110  
+0.110  
+0.110  
+0.110  
+0.110  
C5247B  
C5248B  
C5249B  
C5250B  
C5251B  
C5252B  
C5253B  
C5254B  
C5255B  
C5256B  
C5257B  
C5258B  
C5259B  
C5260B  
C5261B  
C5262B  
C5263B  
C5264B  
C5265B  
C5266B  
C5267B  
C5268B  
C5269B  
C5270B  
C5271B  
C5272B  
C5273B  
C5274B  
C5275B  
C5276B  
C5277B  
C5278B  
400  
500  
750  
900  
1100  
1300  
1500  
1700  
1900  
DO-35 CASE - MECHANICAL OUTLINE  
B
A
D
C
D
R5 (8-May 2020)  
www.centralsemi.com  
OUTSTANDING SUPPORT AND SUPERIOR SERVICES  
PRODUCT SUPPORT  
Central’s operations team provides the highest level of support to insure product is delivered on-time.  
• Supply management (Customer portals)  
• Inventory bonding  
• Custom bar coding for shipments  
• Custom product packing  
• Consolidated shipping options  
DESIGNER SUPPORT/SERVICES  
Central’s applications engineering team is ready to discuss your design challenges. Just ask.  
• Free quick ship samples (2nd day air)  
• Online technical data and parametric search  
• SPICE models  
• Special wafer diffusions  
• PbSn plating options  
• Package details  
• Custom electrical curves  
• Application notes  
• Environmental regulation compliance  
• Customer specific screening  
• Up-screening capabilities  
• Application and design sample kits  
• Custom product and package development  
REQUESTING PRODUCT PLATING  
1. If requesting Tin/Lead plated devices, add the suffix “ TIN/LEAD” to the part number when  
ordering (example: 2N2222A TIN/LEAD).  
2. If requesting Lead (Pb) Free plated devices, add the suffix “ PBFREE” to the part number  
when ordering (example: 2N2222A PBFREE).  
CONTACT US  
Corporate Headquarters & Customer Support Team  
Central Semiconductor Corp.  
145 Adams Avenue  
Worldwide Field Representatives:  
www.centralsemi.com/wwreps  
Hauppauge, NY 11788 USA  
Main Tel: (631) 435-1110  
Main Fax: (631) 435-1824  
Support Team Fax: (631) 435-3388  
www.centralsemi.com  
Worldwide Distributors:  
www.centralsemi.com/wwdistributors  
For the latest version of Central Semiconductor’s LIMITATIONS AND DAMAGES DISCLAIMER,  
which is part of Central’s Standard Terms and Conditions of sale, visit: www.centralsemi.com/terms  
(001)  
www.centralsemi.com  
PDN01089  
5/02/18  
11/02/18  
5/02/19  
http://www.centralsemi.com  
Summary:All high voltage 500mW Zener diodes in the DO-35 package are discontinued and now classified as End of Life (EOL).  
Although Central Semiconductor Corp. makes every effort to continue to produce devices that have been proclaimed EOL (End of Life) by  
other manufacturers, it is an accepted industry practice to discontinue certain devices when customer demand falls below a minimum level of  
sustainability. Accordingly, the following product(s) have been transitioned to End of Life status as part of Central's ongoing Product  
Management Process. Any replacement products are noted below. The effective date for placing last purchase orders will be six (6) months  
from the date of this notice and twelve (12) months from the notice date for final shipments, and minimum order quantities may apply.  
The last purchase and shipment dates may be extended if inventory is available.  
Central Part Number  
1N5263B BK  
1N5263B TR  
1N5264B BK  
1N5264B TR  
1N5265B BK  
1N5265B TR  
1N5266B BK  
1N5266B TR  
1N5267B BK  
1N5267B TR  
1N5268B AP  
1N5268B BK  
1N5268B TR  
1N5269B AP  
1N5269B BK  
1N5269B TR  
1N5270B AP  
1N5270B BK  
1N5270B TR  
1N5271B AP  
1N5271B BK  
1N5271B TR  
1N5272B AP  
1N5272B BK  
1N5272B TR  
1N5273B AP  
1N5273B BK  
1N5273B TR  
1N5274 TR  
Replacement  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
1N5274B BK  
1N5274B TR  
1N5275B BK  
1N5275B TR  
1N5276B BK  
1N5276B TR  
1N5277B BK  
1N5277B TR  
1N5278B BK  
*** CONTINUED ***  
PDN01089  
5/02/18  
11/02/18  
5/02/19  
http://www.centralsemi.com  
*** CONTINUED FROM PRIOR PAGE ***  
Central Part Number  
1N5278B TR  
1N5279B BK  
1N5279B TR  
1N5280B BK  
1N5280B TR  
1N5281B BK  
1N5281B TR  
Replacement  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
Central would be happy to assist you by providing additional information or technical data to help locate an alternate source if we  
have no replacement available. Please email your requests to engineering@centralsemi.com.