500 mW GLASS AXIAL-LEAD
ZENER DIODES
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 1
WWW.Microsemi .COM
SCOTTSDALE DIVISION
1N5221 thru 1N5281B, e3 DO-35
1N5221−1N5281B,e3 DO-35
DESCRIPTION APPEARANCE
The popular 1N5221 thru 1N5281B series of 0.5 watt Zener Voltage Regulators
provides a selection from 2.4 to 200 volts in standard 5% or 10% tolerances as
well as tighter tolerances identified by different suffix letters on the part number.
These glass axial-leaded DO-35 Zeners are also available in various military
screening levels by adding a prefix identifier as described in the Features
section. Microsemi also offers numerous other Zener products to meet higher
and lower power applications.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
FEATURES APPLIC ATIONS / BENEFITS
• JEDEC registered 1N5221 to 1N5281B
• Internal bonds optionally avail able with “-1” suffix
• Options for screening in accordance with MIL-PRF-
19500 for JAN, JANTX, JANTXV, and JANS are
available by adding MQ, MX, MV, or MSP prefixes
respectively to part numbers with “-1” suffix.
• Surface mount equivalents availa ble as MLL5221 to
MLL5281B in the DO-213AA MELF style pa ckage
including “-1” suffix options (consult factory for others)
• RoHS Compliant devices avai lable by adding “e3” suffix
• DO-7 glass body axial-leaded Zener equivalents are also
available
• Regulates voltage over a broad op erating current
and temperature range
• Extensive selection from 2.4 to 200 V
• Standard voltage tolerances are plus/minus 5%
with B suffix, 10 % with A suffix identification
• Tight tolerances available in plus or minus 2% or
1% with C or D suffix respectively
• Flexible axial-lead mounting terminals
• Nonsensitive to ESD (MIL-STD-750 Method 1020)
• Minimal capacitance (see Figure 2)
• Inherently radiation hard per MicroNote 050
MAXIMUM RAT ING S MECHANICAL AND PACKAGING
• Power dissipation at 25ºC: 0.5 watts (also see derating
in Figure 1).
• Operating and Storage temperature: -65ºC to +175ºC
• Thermal Resistance: 250 ºC/W junction to lead at 3/8
(10 mm) lead length from body, or 310ºC/W junction to
ambient when mounted on FR4 PC board (1 oz Cu)
with 4 mm2 cop per pads and track width 1 mm, length
25 mm
• Steady-State Power: 0.5 watts at TL < 50oC 3/8 inch
(10 mm) from body or 0.48 W at TA < 25ºC when
mounted on FR4 PC board as described for thermal
resistance above (also see F igure1)
• Forward voltage @200 mA: 1.1 volts (maximum)
• Solder Temperatures: 260 ºC for 10 s (max)
• CASE: Hermetically sealed axial-lead glass DO-
35 (DO-204AH) package
• FINISH: Tin-Lead or RoHS Compliant annealed
matte-Tin plating solderable per MIL-STD-750,
method 2026
• POLARITY: Cathode indicated by band. Diode to
be operated with the banded end positive with
respect to the opposite end for Zener regulation
• MARKING: Part number
• TAPE & REEL option: Standard per EIA-296 (add
“TR” suffix to part number)
• WEIGHT: 0.2 grams
See package dimensions on l ast page
ELECTRICAL CHARACTERISTICS @ 25°C Max Rever s e Current Max Zener Impedance
A & B Suffix Only
Note 2 A, B, C & D Suffix Only Non-Suffix
IR @ VR
μA Volts
JEDEC
Type No.
Note 1
Nominal
Zener
Voltage
VZ @ IZT
Volts
Test
Current
IZT
mA ZZT @ IZK
Ohms
ZZK @ IZK = 0.25
mA
Ohms A B,C & D
IR @ VR Used
For Suffix A
μA
Max Zener
Voltage Temp.
Coeff.
(A & B Suffix
Only)
αVZ (% / oC)
Note 3
1N5221
1N5222
1N5223
1N5224
1N5225
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
100
100
75
75
50
0.95
0.95
0.95
0.95
0.95
1.0
1.0
1.0
1.0
1.0
200
200
150
150
100
-0.085
-0.085
-0.080
-0.080
-0.075
1N5226
1N5227
1N5228
1N5229
1N5230
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
25
15
10
5.0
50
0.95
0.95
0.95
0.95
1.9
1.0
1.0
1.0
1.0
2.0
100
100
75
50
50
-0.070
-0.065
-0.060
+/-0.055
+/-0.030
DO-35
(DO-204AH)
Copyright © 2005
8-29-2005 REV C
500 mW GLASS AXIAL-LEAD
ZENER DIODES
WWW.Microsemi .COM
SCOTTSDALE DIVISION
1N5221 thru 1N5281B, e3 DO-35
1N5221−1N5281B,e3 DO-35
Max Reverse Current Max Zener Impedance
A & B Suffix Only
Note 2 A, B, C & D Suffix Only Non-Suffix
IR @ VR
μA Volts
JEDEC
Type No.
Note 1
Nominal
Zener
Voltage
VZ @ IZT
Volts
Test
Current
IZT
mA ZZT @ IZK
Ohms
ZZK @ IZK = 0.25
mA
Ohms A B,C & D
IR @ VR Used
For Suffix A
μA
Max Zener
Voltage Temp.
Coeff.
(A & B Suffix
Only)
αVZ (% / oC)
Note 3
1N5231
1N5232
1N5233
1N5234
1N5235
5.1
5.6
6.0
6.2
6.8
20
20
20
20
20
17
11
7.0
7.0
5.0
1600
1600
1600
1000
750
5.0
5.0
5.0
5.0
3.0
1.9
2.9
3.3
3.8
4.8
2.0
3.0
3.5
4.0
5.0
50
50
50
50
30
+/-0.030
+0.038
+0.038
+0.045
+0.050
1N5236
1N5237
1N5238
1N5239
1N5240
7.5
8.2
8.7
9.1
10
20
20
20
20
20
6.0
8.0
8.0
10
17
500
500
600
600
600
3.0
3.0
3.0
3.0
3.0
5.7
6.2
6.2
6.7
7.6
6.0
6.5
6.5
7.0
8.0
30
30
30
30
30
+0.058
+0.062
+0.065
+0.068
+0.075
1N5241
1N5242
1N5243
1N5244
1N5245
11
12
13
14
15
20
20
9.5
9.0
8.5
22
30
13
15
16
600
600
600
600
600
2.0
1.0
0.5
0.1
0.1
8.0
8.7
9.4
9.5
10.5
8.4
9.1
9.9
10
11
30
10
10
10
10
+0.076
+0.077
+0.079
+0.082
+0.082
1N5246
1N5247
1N5248
1N5249
1N5250
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
0.1
0.1
0.1
0.1
0.1
11.4
12.4
13.3
13.3
14.3
12
13
14
14
15
10
10
10
10
10
+0.083
+0.084
+0.085
+0.086
+0.086
1N5251
1N5252
1N5253
1N5254
1N5255
22
24
25
27
28
5.6
5.2
5.0
4.6
4.5
29
33
35
41
44
600
600
600
600
600
0.1
0.1
0.1
0.1
0.1
16.2
17.1
18.1
20
20
17
18
19
21
21
10
10
10
10
10
+0.087
+0.088
+0.089
+0.090
+0.091
1N5256
1N5257
1N5258
1N5259
1N5260
30
33
36
39
43
4.2
3.8
3.4
3.2
3.0
49
58
70
80
93
600
700
700
800
900
0.1
0.1
0.1
0.1
0.1
22
24
26
29
31
23
25
27
30
33
10
10
10
10
10
+0.091
+0.092
+0.093
+0.094
+0.095
1N5261
1N5262
1N5263
1N5264
1N5265
47
51
56
60
62
2.7
2.5
2.2
2.1
2.0
105
125
150
170
185
1000
1100
1300
1400
1400
0.1
0.1
0.1
0.1
0.1
34
37
41
44
45
36
39
43
46
47
10
10
10
10
10
+0.095
+0.096
+0.096
+0.097
+0.097
1N5266
1N5267
1N5268
1N5269
1N5270
68
75
82
87
91
1.8
1.7
1.5
1.4
1.4
230
270
330
370
400
1600
1700
2000
2200
2300
0.1
0.1
0.1
0.1
0.1
49
53
59
65
66
52
56
62
68
69
10
10
10
10
10
+0.097
+0.098
+0.098
+0.099
+0.099
1N5271
1N5272
1N5273
1N5274
1N5275
100
110
120
130
140
1.3
1.1
1.0
0.95
0.90
500
750
900
1100
1300
2600
3000
4000
4500
4500
0.1
0.1
0.1
0.1
0.1
72
80
86
94
101
76
84
91
99
106
10
10
10
10
10
+0.110
+0.110
+0.110
+0.110
+0.110
1N5276
1N5277
1N5278
1N5279
1N5280
1N5281
150
160
170
180
190
200
0.85
0.80
0.74
0.68
0.66
0.65
1500
1700
1900
2200
2400
2500
5000
5500
5500
6000
6500
7000
0.1
0.1
0.1
0.1
0.1
0.1
108
116
123
130
137
144
114
122
129
137
144
152
10
10
10
10
10
10
+0.110
+0.110
+0.110
+0.110
+0.110
+0.110
*JEDEC registered data. JEDEC type numbers listed indicate a tolerance of +/-20% with guaranteed limits on only VZ, IR, and VF. Devices with
guaranteed limits on all six parameters are indicated by suffix A for +/-10% tolerance and suffix B for +/-5% tolerance. Also available with suffix C
or D which indicates 2% and 1% tolerance respectively.
NOTES:
1. The electrical characteristics are measured after allowing the device to stabilize for 20 seconds when mounted with a 3/8” (10 mm) minimum
lead length from the case.
2. The zener impedance is derived from the 60 Hz ac voltage that results when an ac current having an rms value equal to 10% of the dc zener
current (IZT or IZK) is superimposed on IZT or IZK. Zener impedance is measured at two points to ensure a sharp knee on the breakdown curve,
thereby eliminating unstable units. Also see MicroNote 202 for variation in dynamic impedance with different operating currents.
3. Temperature coefficient (αVZ). Test conditions for temperature coefficient are as follows:
a. IZT = 7.5 mA, T1 = 25oC, T2 = 125oC (1N5221A, B thru 1N5242A, B).
b. IZT = Rated IZT, T1 = 25oC, T2 = 125oC (1N5243A, B thru 1N5281A, B).
(Device to be temperature stabilized with current applied prior to reading breakdown voltage at the specified ambient temp.)
Microsemi
Scottsdale Division Page 2
Copyright © 2005
8-29-2005 REV C 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
500 mW GLASS AXIAL-LEAD
ZENER DIODES
WWW.Microsemi .COM
SCOTTSDALE DIVISION
1N5221 thru 1N5281B, e3 DO-35
1N5221−1N5281B,e3 DO-35
GRAPHS
Microsemi
Scottsdale Division Page 3
Copyright © 2005
8-29-2005 REV C
TL Lead Temperature at 3/8” From Body
or TA on FR4 PC Board
FIGURE 1
POWER DERATING CURVE
FIGURE 2
CAPACITANCE vs. ZENER VOLTAGE
(TYPICAL)
Pd, Rated Power Dissipation (mW)
PACKAGE DIMEN SIONS
All dimensions in INCH
mm
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
