WILLAS
Silicon Z–Diodes
Features
D
D
D
D
Plannar Die constuction
500mW Power Dissipation
Ideally Suited for Automated Assembly Processes
V
Z
–tolerance
±
5%
1N5221B
THRU
1N5267B
Unit: inch (mm)
DO-35
.022(0.55)
.018(0.45)
1.02(26.0)
MIN.
.153(3.6)
.132(3.0)
Applications
Voltage stabilization
.087(2.2)
.067(1.7)
1.02(26.0)
MIN.
MECHANICAL DATA
Approx. Weight:
0.136 grams
Absolute Maximum Ratings
T
j
= 25
_
C
Parameter
Power dissipation
Z–current
Junction temperature
Storage temperature range
Test Conditions
T
amb=25
°
C
Type
Symbol
P
TOT
I
Z
T
j
T
stg
Value
500
P
V
/V
Z
175
–65...+175
Unit
mW
mA
°
C
°
C
Maximum Thermal Resistance
T
j
= 25
_
C
Parameter
Junction ambient
Test Conditions
l=9.5mm (3/8”), T
L
=constant
Symbol
R
thJA
Value
300
Unit
K/W
Electrical Characteristics
T
j
= 25
_
C
Parameter
Forward voltage
Test Conditions
I
F
=200mA
Type
Symbol
V
F
Min
Typ
Max
1.1
Unit
V
2010.06
WILLS ELECTRONIC CORP.
WILLAS
500 mWatts Zener Diodes
Nominal Zener Voltage
Part No.
Nom. V
1N5261B
1N5262B
1N5263B
1N5264B
1N5265B
1N5266B
1N5267B
47.0
51.0
56.0
60.0
62.0
68.0
75.0
1N5221B THRU 1N5267B
Max. Zener Impedance
Z
ZT
@ I
ZT
Z
ZK
@ I
ZK
Ω
1000
1100
1300
1400
1400
1600
1700
Max Reverse
Leakage Current
I
R
@ V
R
μA
0.1
0.1
0.1
0.1
0.1
0.1
0.1
TK
V
Z
V
Z
@ I
ZT
Min. V
44.65
48.45
53.20
57.00
58.90
64.60
71.25
Marking
Code
Max. V
49.35
53.55
58.80
63.00
65.10
71.40
78.75
Ω
150
125
150
170
185
230
270
mA
2.7
2.5
2.2
2.1
2.0
1.8
1.7
mA
0.25
0.25
0.25
0.25
0.25
0.25
0.25
V
36.0
39.0
43.0
46.0
47.0
52.0
56.0
%/K
<+0.095
<+0.096
<+0.096
<+0.097
<+0.097
<+0.097
<+0.098
1N5261B
1N5262B
1N5263B
1N5264B
1N5265B
1N5266B
1N5267B
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
POWER DISSIPATION, mWatts
500
400
300
200
100
0
50
100
150
200
O
250
AMBIENT TEMPERATURE, C
FIG. 1 POWER DERATING CURVE
Vz (V)
Iz (mA)
50
40
30
20
10
0
5
10
15
20
25
30
Test Current
Iz = 20mA
24
20
15
12
11
9.1
6.8
6.2
5.6
5.1
4.7
4.3
3.9
2.7
Fig.2 BREAKDOWN CHARACTERISTICS
2010.08
WILLS ELECTRONIC CORP.
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