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Frontier Electronics Corp.  
667 E. COCHRAN STREET, SIMI VALLEY, CA 93065  
TEL: (805) 522-9998 FAX: (805) 522-9989  
E-mail: frontiersales@frontierusa.com  
Web: http://www.frontierusa.com  
1.5 WATT SILICON ZENER DIODE  
1N5921B-LFR THRU 1N5956B-LFR  
FEATURES  
z PLASTIC PACKAGE HAS UNDERWRITERS LABORATORY  
FLAMMABILITY CLASSIFICATION 94V-0  
z LOW ZENER IMPEDANCE  
1.0(25.4)  
MIN  
z EXCELLENT CLAMPING CAPABILITY  
z LEAD FREE  
.034(0.9)  
.028(0.7)  
.205(5.2)  
.166(4.2)  
MECHANICAL DATA  
z CASE: MOLDED PLASTIC, DO41, DIMENSIONS  
IN INCHES AND (MILLIMETERS)  
z TERMINALS: AXIAL LEADS SOLDERABLE PER  
MIL-STD-202,METHOD 208  
.107(2.7)  
.080(2.0)  
1.0(25.4)  
MIN  
z POLARITY: COLOR BAND DENOTES CATHODE  
z MOUNTING POSITION: ANY  
z WEIGHT: .34 GRAM  
MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS RATINGS AT 25°C AMBIENT TEMPERATURE UNLESS OTHERWISE SPECIFIED  
STORAGE AND OPERATING TEMPERATURE RANGE -55 TO + 150°C  
ELECTRICAL CHARACTERISTICS (TL=30°C UNLESS OTHERWISE NOTED VF=1.5V MAX, @IF = 200mA DC FOR ALL TYPES)  
MAXIMUM DC  
ZENER  
NOMINAL  
ZENER VOLTS  
VZ@IZT  
TEST  
CURRENT  
IZT  
MAX. REVERSE  
LEAKAGE CURRENT  
MAXIMUM ZENER IMPEDANCE  
JEDEC  
TYPE  
CURRENT  
IZM  
IR  
@
VR  
ZZT @ IZT  
Ohms  
ZZK  
Ohms  
@
IZK  
VOLTS  
mA  
mA DC  
mA  
μA  
VOLTS  
1N5921B-LFR  
1N5922B-LFR  
1N5923B-LFR  
1N5924B-LFR  
1N5925B-LFR  
1N5926B-LFR  
1N5927B-LFR  
1N5928B-LFR  
1N5929B-LFR  
1N5930B-LFR  
1N5931B-LFR  
1N5932B-LFR  
1N5933B-LFR  
1N5934B-LFR  
1N5935B-LFR  
1N5936B-LFR  
1N5937B-LFR  
1N5938B-LFR  
1N5939B-LFR  
1N5940B-LFR  
1N5941B-LFR  
1N5942B-LFR  
1N5943B-LFR  
1N5944B-LFR  
1N5945B-LFR  
1N5946B-LFR  
1N5947B-LFR  
1N5948B-LFR  
1N5949B-LFR  
1N5950B-LFR  
1N5951B-LFR  
1N5952B-LFR  
1N5953B-LFR  
1N5954B-LFR  
1N5955B-LFR  
1N5956B-LFR  
6.8  
7.5  
8.2  
9.1  
10  
55.1  
50.0  
45.7  
41.2  
37.5  
34.1  
31.2  
28.8  
25.0  
23.4  
20.8  
18.7  
17.0  
15.6  
13.9  
12.5  
11.4  
10.4  
9.6  
2.5  
3
200  
400  
1
5
5
5
5
5
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
5.2  
6
220  
200  
182  
164  
150  
136  
125  
115  
100  
93  
83  
75  
68  
62  
55  
50  
45  
41  
38  
34  
31  
29  
26  
24  
22  
20  
18  
16  
15  
13  
12  
11  
10  
9
0.5  
3.5  
4
400  
0.5  
6.5  
500  
0.5  
7
8
4.5  
5.5  
6.5  
7
500  
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  
11  
550  
8.4  
12  
550  
9.1  
13  
550  
9.9  
15  
9
600  
11.4  
12.2  
13.7  
15.2  
16.7  
18.2  
20.6  
22.8  
25.1  
27.4  
29.7  
32.7  
35.8  
38.8  
42.6  
47.1  
51.7  
56  
16  
10  
600  
18  
12  
650  
20  
14  
650  
22  
17.5  
19  
650  
24  
700  
27  
23  
700  
30  
26  
750  
33  
33  
800  
36  
38  
850  
39  
45  
900  
43  
8.7  
53  
950  
47  
8.0  
67  
1000  
1100  
1300  
1500  
1700  
2000  
2500  
3000  
3100  
4000  
4500  
5000  
6000  
6500  
7000  
8000  
51  
7.3  
70  
56  
6.7  
86  
62  
6.0  
100  
120  
140  
160  
200  
250  
300  
380  
450  
600  
700  
900  
1200  
68  
5.5  
75  
5.0  
82  
4.6  
62.2  
69.2  
76  
83.6  
91.2  
98.8  
114  
121.6  
136.8  
152  
91  
4.1  
100  
110  
120  
130  
150  
160  
180  
200  
3.7  
3.4  
3.1  
2.9  
2.5  
2.3  
2.1  
8
1.9  
7
NOTE: SUFFIX “B” FOR ± 5%  
1N5921B-LFR THRU 1N5956B-LFR  
Page: 1  
RATINGS AND CHARACTERISTIC CURVES 1N5921B-LFR THRU 1N5956B-LFR  
TEMPERATURE COEFFICIENT RANGES (90% of the Units are in the Ranges Indicated)  
Figure. 2 - Units 10 To 1400 Volts  
Figure. 1 - Units To 12 Volts  
1000  
10  
8
500  
6
200  
4
100  
50  
2
RANGE  
0
20  
10  
-2  
-4  
10  
20  
50  
100  
200  
400  
1000  
3
4
5
6
7
8
9
10  
11  
12  
VZ, ZENER VOLTAGE ＠IZT(VOLTS)  
VZ, ZENER VOLTAGE ＠IZT(VOLTS)  
ZENER VOLTAGE versus ZENER CURRENT  
Figure. 4 - VZ=12 thru 82 Volts  
Figure. 3 - VZ=3.3thru 10 Volts  
100  
100  
50  
30  
20  
50  
30  
20  
10  
5
10  
5
3
3
2
2
1
1
0.5  
0.3  
0.2  
0.1  
0.5  
0.3  
0.2  
0.1  
0
1
2
3
4
5
6
7
8
9
10  
0
10 20 30  
VZ, ZENER VOLTAGE ＠IZT(VOLTS)  
Figure. 6 - Typical Thermal Resistance  
40 50 60 70 80 90 100  
VZ, ZENER VOLTAGE ＠IZT(VOLTS)  
Figure. 5 - VZ=100 thru 400 Volts  
10  
80  
5
2
70  
60  
50  
40  
30  
20  
10  
0
1
L
L
0.5  
TL  
0.2  
0.1  
PRIMARY PATH OF CONDUCTION IS  
THROUGH THE CATHODE LEAD  
100 150  
200  
250  
300  
350  
400  
450  
0
1/8 1/4 3/8 1/2 5/3 3/4 7/8  
L, LEAD LENGTH TO HEAT SINK (INCH)  
1
VZ, ZENER VOLTAGE ＠IZT(VOLTS)  
Figure. 7 - Power Temperature Derating Curve  
2.5  
2.0  
1.5  
1.0  
0.5  
0
20 40  
60  
80 100 120 140 160 180 200  
T , LEAD TEMPERATURE (OC)  
L
1N5921B-LFR THRU 1N5956B-LFR  
Page: 2