
Low Voltage Surface Mount  
500 mW Avalanche Diodes 
SCOTTSDALE DIVISION
IN5518BUR-1 thru 1N5546BUR-1  
(or MLL5518B-1 thru MLL5546B-1) 
W
M
.
C
1
ELECTRICAL CHARACTERISTICS 
(T
A
 = 25
o
C unless otherwise noted.  Based on DC measurements at 
thermal equilibrium; 
V
F
 = 1.1 Max @ IF = 200 mA for all types.) 
MAX. REVERSE CURRENT 
(Note 4) 
NUMBER 
(Note 1 and 
Note 7) 
V
Z
 @ I
ZT
(Note 2) 
VOLTS 
OHMS 
SUFFIX 
1N5518BUR-1 
1N5519BUR-1 
1N5520BUR-1 
1N5521BUR-1 
1N5522BUR-1 
4.7 
10 
22 
2.0 
1N5523BUR-1 
1N5524BUR-1 
1N5525BUR-1 
1N5526BUR-1 
1N5527BUR-1 
7.5 
1.0 
35 
0.5 
1N5528BUR-1 
1N5529BUR-1 
1N5530BUR-1 
1N5531BUR-1 
1N5532BUR-1 
12.0 
1.0 
90 
0.05 
1N5533BUR-1 
1N5534BUR-1 
1N5535BUR-1 
1N5536BUR-1 
1N5537BUR-1 
17.0 
1.0 
100 
0.01 
1N5538BUR-1 
1N5539BUR-1 
1N5540BUR-1 
1N5541BUR-1 
1N5542BUR-1 
24.0 
1.0 
100 
0.01 
1N5543BUR-1 
1N5544BUR-1 
1N5545BUR-1 
1N5546BUR-1 
33.0 
1.0 
100 
0.01 
NOTES:
1. 
TOLERANCE AND VOLTAGE DESIGNATION –  
The JEDEC type numbers without a letter prior to the UR-1 suffix are +/-20% with guaranteed limits for only V
Z
, I
R
, and V
F
.   
                Units with “A” prior to the UR-1 suffix are +/-10% with guaranteed limits for V
Z
, I
R
, and V
F
.  Units with guaranteed limits for all six  
                parameters are indicated by a B suffix for +/-5.0% units, C suffix for +/-2.0% and D suffix for +/-1.0% prior to the UR-1 suffix. 
2. 
ZENER VOLTAGE (V
Z
) MEASUREMENT –  
Nominal zener voltage is measured with the device junction in thermal equilibrium with ambient temperature of 25
o
C. 
3. 
ZENER IMPEDANCE (Z
Z
) MEASUREMENT –  
The zener impedance is derived from the 60 Hz ac voltage, which results when an ac current having an rms value equal to 10%  
of the dc zener current (I
ZT
) is superimposed on I
ZT
. 
4. 
REVERSE CURRENT (I
R
) –  
Reverse currents are guaranteed and are measured at V
R
 as shown on the table. 
5. 
MAXIMUM REGULATOR CURRENT (I
ZM
) – 
The maximum current shown is as shown in MIL-PRF-19500/437. 
6. 
MAXIMUM REGULATION FACTOR (
V
Z
) –  
V
Z
 is the maximum difference between V
Z
 at I
ZT
 and V
Z
 at I
ZL
 measured with the device junction in thermal equilibrium. 
7. 
PART NUMBER –  These may be ordered as either 1N5518BUR-1 thru 1N5546BUR-1 or as MLL5518B-1 thru MLL5546B-1 part  
                numbers.  For military types, use the 1NxxxUR-1 format and also include JAN, JANTX, or JANTXV prefix for desired screening 
                level,  e.g. JANTX1N5518BUR-1, JANTXV1N5532BUR-1, JANTXV1N5534CUR-1, JANTXV1N5545DUR-1, etc.  
V
R
 – VOLTS 
JEDEC TYPE 
NOMINAL 
ZENER 
VOLTAGE 
TEST 
CURRENT 
I
ZT
mAdc 
MAX. ZENER 
IMPEDANCE 
B-C-D SUFFIX 
Z
ZT
 @ I
ZT 
(Note 3) 
I
R 
μ
Adc 
NON & A- 
B-C-D 
SUFFIX 
1.0 
1.0 
1.0 
1.5 
2.0 
2.5 
3.5 
5.0 
6.2 
6.8 
7.5 
8.2 
9.1 
9.9 
10.8 
11.7 
12.6 
13.5 
14.4 
15.3 
16.2 
17.1 
18.0 
19.8 
21.6 
22.4 
25.2 
27.0 
29.7 
B-C-D 
SUFFIX 
MAXIMUM 
DC ZENER 
CURRENT 
I
ZM
(Note 5)
mAdc 
115 
105 
98 
88 
81 
75 
68 
61 
56 
51 
46 
42 
38 
35 
32 
29 
27 
25 
24 
22 
21 
20 
19 
17 
16 
15 
14 
13 
12 
B-C-D SUFFIX 
MAX. NOISE 
DENSITY 
AT I
Z
 = 250
μ
A  
N
D 
μ
V/ 
√
Hz
REGULATION 
FACTOR 
V
Z 
(Note 6) 
VOLTS 
0.90 
0.90 
0.85 
0.75 
0.60 
0.65 
0.30 
0.20 
0.10 
0.05 
0.05 
0.05 
0.10 
0.20 
0.20 
0.20 
0.20 
0.20 
0.20 
0.20 
0.20 
0.20 
0.20 
0.25 
0.30 
0.35 
0.40 
0.45 
0.50 
LOW V
Z
CURRENT 
I
ZL 
(Note 6)
mAdc 
3.3 
3.6 
3.9 
4.3 
20 
20 
20 
20 
26 
24 
22 
18 
5.0 
3.0 
1.0 
3.0 
0.90 
0.90 
0.90 
1.0 
1.5 
2.0 
3.0 
4.5 
5.5 
6.0 
6.5 
7.0 
8.0 
9.0 
9.5 
10.5 
11.5 
12.5 
13.0 
14.0 
15.0 
16.0 
17.0 
18.0 
20.0 
21.0 
23.0 
24.0 
28.0 
0.5 
0.5 
0.5 
0.5 
0.5 
0.5 
1.0 
1.0 
1.0 
2.0 
4.0 
4.0 
4.0 
5.0 
10 
15 
20 
20 
20 
20 
20 
20 
20 
20 
20 
20 
20 
20 
20 
2.0 
2.0 
2.0 
2.0 
1.0 
0.25 
0.25 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
0.01 
5.1 
5.6 
6.2 
6.8 
5.0 
3.0 
1.0 
1.0 
26 
30 
30 
30 
2.0 
2.0 
1.0 
1.0 
8.2 
9.1 
10.0 
11.0 
1.0 
1.0 
1.0 
1.0 
40 
45 
60 
80 
0.5 
0.1 
0.05 
0.05 
13.0 
14.0 
15.0 
16.0 
1.0 
1.0 
1.0 
1.0 
90 
100 
100 
100 
0.01 
0.01 
0.01 
0.01 
18.0 
19.0 
20.0 
22.0 
1.0 
1.0 
1.0 
1.0 
100 
100 
100 
100 
0.01 
0.01 
0.01 
0.01 
25.0 
28.0 
30.0 
1.0 
1.0 
1.0 
100 
100 
100 
0.01 
0.01 
0.01 
Microsemi 
Scottsdale Division 
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503 
Page 2
Copyright 
 2003 
10-31-2003  REV B