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®
1N5221B – 1N5261B  
500mW ZENER DIODE  
WON-TOP ELECTRONICS  
Features  
Planar Die Construction  
500mW Power Dissipation  
2.4V – 47V Nominal Zener Voltage  
5% Standard Vz Tolerance  
A
B
A
Low Inductance  
For Use in Voltage Regulator or Reference  
Plastic Case Material has UL Flammability  
Classification Rating 94V-0  
C
D
Mechanical Data  
Case: DO-35, Molded Glass  
Terminals: Plated Leads Solderable per  
MIL-STD-202, Method 208  
Polarity: Cathode Band  
Weight: 0.13 grams (approx.)  
Mounting Position: Any  
Marking: Type Number  
Lead Free: For RoHS / Lead Free Version,  
Add “-LF” Suffix to Part Number, See Page 5  
DO-35  
Dim  
A
Min  
25.40  
—
Max  
—
B
3.80  
0.55  
1.95  
C
0.45  
1.65  
D
All Dimensions in mm  
Maximum Ratings @TA=25°C unless otherwise specified  
Characteristic  
Power Dissipation at TA = 25°C (Note 1)  
Forward Voltage @ IF = 200mA  
Symbol  
PD  
Value  
500  
Unit  
mW  
V
VF  
1.1  
Thermal Resistance Junction to Ambient (Note 2)  
Operating and Storage Temperature Range  
RθJA  
TJ, TSTG  
300  
°C/W  
°C  
-65 to +175  
Note: 1. Measured at lead length 3/8” (9.5mm) from body.  
2. Valid provided that leads are kept at ambient temperature at a distance of 10mm from the case.  
© Won-Top Electronics Co., Ltd.  
Revision: October, 2015  
www.wontop.com  
1
®
1N5221B – 1N5261B  
WON-TOP ELECTRONICS  
5V6 6V8 8V2  
6V2 7V5  
0.5  
40  
30  
20  
10  
0
TJ = 25°C  
2V4  
2V7  
3V0  
3V3  
3V6  
3V9  
4V3  
4V7  
5V1  
9V1  
Measured at lead length  
9.5mm from case.  
0.4  
0.3  
0.2  
0.1  
0
0
35  
70  
105  
140  
175  
210  
0
1
2
3
4
5
6
7
8
9
10  
TA, AMBIENT TEMPERATURE (°C)  
Fig. 1 Power Derating Curve  
VZ, ZENER VOLTAGE (V)  
Fig. 2 Zener Breakdown Characteristics  
25  
20  
15  
10  
5
10  
8
10  
39 47  
TJ = 25°C  
TJ = 25°C  
12  
43  
15  
18  
6
22  
27  
4
33  
36  
2
0
0
0
5
10 15 20 25 30 35 40 45 50  
0
10 20 30 40 50 60 70 80 90 100  
VZ, ZENER VOLTAGE (V)  
Fig. 3 Zener Breakdown Characteristics  
VZ, ZENER VOLTAGE (V)  
Fig. 4 Zener Breakdown Characteristics  
1000  
100  
1000  
100  
10  
TJ = 25°C  
f = 1MHz  
@ 0V Bias  
@ 1V Bias  
TJ = 100°C  
10  
TJ = 25°C  
1
0
0.4  
0.6  
0.8  
1.0  
1
10  
100  
VF, INSTANTANEOUS FORWARD VOLTAGE (V)  
Fig. 5 Typical Forward Characteristics  
VZ, NOMINAL ZENER VOLTAGE (V)  
Fig. 6 Junction Capacitance vs. Nominal Zener Voltage  
www.wontop.com  
2
© Won-Top Electronics Co., Ltd.  
Revision: October, 2015  
®
1N5221B – 1N5261B  
WON-TOP ELECTRONICS  
Electrical Characteristics (@TA=25°C unless otherwise specified) Table 1  
Typical Temp.  
Coefficient of Zener  
Voltage  
Nominal Zener  
Voltage (Note 2)  
Test  
Maximum Zener Impedance  
(Note 3)  
Maximum Reverse  
Leakage Current  
Type  
Current  
Number  
(Note 1)  
VZ @ IZT  
(V)  
IZT  
ZZT @ IZT ZZK @ IZK  
IZK  
IR  
@ VR  
(V)  
αVZ @ IZT  
(mA)  
(Ω)  
(Ω)  
(mA)  
(µA)  
(%/°C)  
1N5221B  
1N5222B  
1N5223B  
1N5224B  
1N5225B  
2.4  
2.5  
2.7  
2.8  
3.0  
20  
20  
20  
20  
20  
30  
30  
30  
30  
29  
1200  
1250  
1300  
1400  
1600  
0.25  
0.25  
0.25  
0.25  
0.25  
100  
100  
75  
1.0  
1.0  
1.0  
1.0  
1.0  
-0.085  
-0.085  
-0.080  
-0.080  
-0.075  
75  
50  
1N5226B  
1N5227B  
1N5228B  
1N5229B  
1N5230B  
3.3  
3.6  
3.9  
4.3  
4.7  
20  
20  
20  
20  
20  
28  
24  
23  
22  
19  
1600  
1700  
1900  
2000  
1900  
0.25  
0.25  
0.25  
0.25  
0.25  
25  
15  
1.0  
1.0  
1.0  
1.0  
2.0  
-0.070  
-0.065  
-0.060  
-0.055  
±0.030  
10  
5.0  
5.0  
1N5231B  
1N5232B  
1N5233B  
1N5234B  
1N5235B  
5.1  
5.6  
6.0  
6.2  
6.8  
20  
20  
20  
20  
20  
17  
11  
1600  
1600  
1600  
1000  
750  
0.25  
0.25  
0.25  
0.25  
0.25  
5.0  
5.0  
5.0  
5.0  
3.0  
2.0  
3.0  
3.5  
4.0  
5.0  
±0.030  
+0.038  
+0.038  
+0.045  
+0.050  
7.0  
7.0  
5.0  
1N5236B  
1N5237B  
1N5238B  
1N5239B  
1N5240B  
7.5  
8.2  
8.7  
9.1  
10  
20  
20  
20  
20  
20  
6.0  
8.0  
8.0  
10  
500  
500  
600  
600  
600  
0.25  
0.25  
0.25  
0.25  
0.25  
3.0  
3.0  
3.0  
3.0  
3.0  
6.0  
6.5  
6.5  
7.0  
8.0  
+0.058  
+0.062  
+0.065  
+0.068  
+0.075  
17  
1N5241B  
1N5242B  
1N5243B  
1N5244B  
1N5245B  
11  
12  
13  
14  
15  
20  
20  
22  
30  
13  
15  
16  
600  
600  
600  
600  
600  
0.25  
0.25  
0.25  
0.25  
0.25  
2.0  
1.0  
0.5  
0.1  
0.1  
8.4  
9.1  
9.9  
10  
+0.076  
+0.077  
+0.079  
+0.082  
+0.082  
9.5  
9.0  
8.5  
11  
1N5246B  
1N5247B  
1N5248B  
1N5249B  
1N5250B  
16  
17  
18  
19  
20  
7.8  
7.4  
7.0  
6.6  
6.2  
17  
19  
21  
23  
25  
600  
600  
600  
600  
600  
0.25  
0.25  
0.25  
0.25  
0.25  
0.1  
0.1  
0.1  
0.1  
0.1  
12  
13  
14  
14  
15  
+0.083  
+0.084  
+0.085  
+0.086  
+0.086  
1N5251B  
1N5252B  
1N5253B  
1N5254B  
1N5255B  
1N5256B  
1N5257B  
1N5258B  
1N5259B  
1N5260B  
1N5261B  
22  
24  
25  
27  
28  
30  
33  
36  
39  
43  
47  
5.6  
5.2  
5.0  
4.6  
4.5  
4.2  
3.8  
3.4  
3.2  
3.0  
2.7  
29  
33  
35  
41  
44  
49  
58  
70  
80  
93  
105  
600  
600  
600  
600  
600  
600  
700  
700  
800  
900  
1000  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
17  
18  
19  
21  
21  
23  
25  
27  
30  
33  
36  
+0.087  
+0.087  
+0.089  
+0.090  
+0.091  
+0.091  
+0.092  
+0.093  
+0.094  
+0.095  
+0.095  
Note: 1. Type numbers listed have standard tolerance on the nominal zener voltage of ±5%.  
2. Measured under thermal equilibrium and DC (IZT) test conditions.  
3. f = 1KHz  
© Won-Top Electronics Co., Ltd.  
Revision: October, 2015  
www.wontop.com  
3
®
1N5221B – 1N5261B  
WON-TOP ELECTRONICS  
MARKING INFORMATION  
TAPING SPECIFICATIONS  
0.8mm  
MAX  
5mm  
52  
xxB  
1.2mm  
MAX  
Cathode  
52xxB  
= Polarity Band  
= Device Number  
6mm  
0.8mm  
MAX  
52.4mm  
Cathode Tape: Red  
Anode Tape: White  
PACKAGING INFORMATION  
TAPE & BOX  
TAPE & REEL  
Product ID Label  
75mm  
Inspection Hole  
(both ends)  
330mm  
255mm  
75mm  
BULK  
80±5mm  
21mm  
Product ID Label  
83mm  
196mm  
Reel Diameter /  
Box Size (mm)  
Quantity  
(PCS)  
Carton Size  
(mm)  
Quantity  
(PCS)  
Approx. Gross Weight  
(KG)  
Packaging  
TAPE & REEL  
TAPE & BOX  
BULK  
330  
5,000  
5,000  
2,000  
370 x 370 x 420  
410 x 335 x 265  
410 x 335 x 265  
25,000  
100,000  
100,000  
8.5  
255 x 75 x 75  
196 x 83 x 21  
15.5  
14.5  
Note: 1. Paper reel, white or gray color. Core material: plastic or metal.  
2. Components are packed in accordance with EIA standard RS-296-E.  
www.wontop.com  
4
© Won-Top Electronics Co., Ltd.  
Revision: October, 2015  
®
1N5221B – 1N5261B  
WON-TOP ELECTRONICS  
ORDERING INFORMATION  
Product No.  
Package Type  
Shipping Quantity  
1N52xxB-T3  
DO-35  
DO-35  
DO-35  
5000/Tape & Reel  
5000/Tape & Box  
2000 Units/Box  
1N52xxB-TB  
1N52xxB  
1.  
2.  
Products listed in bold are WTE Preferred Devices  
Shipping quantity given is for minimum packing quantity only. For minimum  
order quantity, please consult the Sales Department.  
3.  
To order RoHS / Lead Free version (with Lead Free finish), add “-LF”  
suffix to part number above. For example, 1N5221B-TB-LF.  
WON-TOP ELECTRONICS and  
are registered trademarks of Won-Top Electronics Co., Ltd (WTE). WTE has checked all information carefully and  
believes it to be correct and accurate. However, WTE cannot assume any responsibility for inaccuracies. Furthermore, this information does not give the  
purchaser of semiconductor devices any license under patent rights to manufacturer. WTE reserves the right to change any or all information herein  
without further notice.  
WARNING: DO NOT USE IN LIFE SUPPORT EQUIPMENT. WTE power semiconductor products are not authorized for use as critical components in life  
support devices or systems without the express written approval.  
Won-Top Electronics Co., Ltd.  
No. 44 Yu Kang North 3rd Road,  
Chine Chen Dist., Kaohsiung 806, Taiwan  
Phone: 886-7-822-5408 or 886-7-822-5410  
Fax: 886-7-822-5417  
Email: sales@wontop.com  
Internet: http://www.wontop.com  
We power your everyday.  
© Won-Top Electronics Co., Ltd.  
Revision: October, 2015  
www.wontop.com  
5