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1N5221B-1 thru 1N5281B-1
Available on
commercial
versions
500 mW GLASS AXIAL-LEAD
ZENER DIODES
DESCRIPTION
The popular 1N5221B-1 thru 1N5281B-1 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 up-screening levels by adding a prefix identifier as
described in the “Part Nomenclature” section of this datasheet. Microsemi also offers
numerous other Zener products to meet higher and lower power applications.
Screening in
reference to
MIL-PRF-19500
available
Important: For the latest information, visit our website http://www.microsemi.com.
FEATURES
JEDEC registered 1N5221 thru 1N5281 series.
Voltage tolerances of 10%, 5%, 2%, and 1% available.
Internal metallurgical bond.
Up-screening in reference to MIL-PRF-19500 is available. (See part nomenclature for all available
options.)
RoHS compliant versions available (commercial grade only).
APPLICATIONS / BENEFITS
Regulates voltage over a broad operating current and temperature range.
Extensive selection from 2.4 to 200 V.
Flexible axial-lead mounting terminals.
Non-sensitive to ESD (MIL-STD-750 method 1020).
Minimal capacitance (see Figure 2).
Inherently radiation hard per Microsemi “MicroNote 050”.
DO-35 (DO-204AH)
Package
Also available in:
DO-213AA MELF
(surface mount)
1N5221BUR-1 thru
1N5281BUR-1
MAXIMUM RATINGS
Parameters/Test Conditions
Junction and Storage Temperature
Thermal Resistance Junction-to-Lead (1)
Thermal Resistance Junction-to-Ambient (2)
Steady-State Power Dissipation (3)
Forward Voltage @ 200 mA
Solder Temperature @ 10 s
Symbol
TJ and TSTG
R ӨJL
R ӨJA
PD
VF
TSP
Value
-65 to +175
250
310
0.5
1.5
260
Unit
oC
oC/W
oC/W
W
V
oC
Notes:
1. At 3/8 (10 mm) lead length from body.
2. When mounted on FR4 PC board (1 oz Cu) with 4 mm2 copper pads and track width 1 mm, length 25
mm.
3. At T L < 50 oC 3/8 inch (10 mm) from body or 0.48 W at T A < 25 ºC when mounted on FR4 PC board as
described for thermal resistance above (also see Figure1).
MSC – Lawrence
6 Lake Street,
Lawrence, MA 01841
Tel: 1-800-446-1158 or
(978) 620-2600
Fax: (978) 689-0803
MSC – Ireland
Gort Road Business Park,
Ennis, Co. Clare, Ireland
Tel: +353 (0) 65 6840044
Fax: +353 (0) 65 6822298
Website:
www.microsemi.com
T4-LDS-0232, Rev. 1 (111957)
©2011 Microsemi Corporation
Page 1 of 5

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1N5221B-1 thru 1N5281B-1
MECHANICAL and PACKAGING
CASE: Hermetically sealed axial-lead glass DO-35 (DO-204AH) package.
TERMINALS: Tin-lead or RoHS compliant annealed matte-tin plating (commercial grade only) solderable per MIL-STD-750,
method 2026.
MARKING: Part number.
POLARITY: Cathode indicated by band. Diode to be operated with the banded end positive with respect to the opposite end for
Zener regulation.
TAPE & REEL option: Standard per EIA-296 (add “TR” suffix to part number). Consult factory for quantities.
WEIGHT: 0.2 grams.
See Package Dimensions on last page.
Reliability Level
MQ (reference JAN)
MX (reference JANTX)
MV (reference JANTXV)
MSP (reference JANS)
Blank = Commercial
JEDEC type number
(see Electrical Characteristics
table)
Zener Voltage Tolerance
A = 10%
B = 5%
C = 2%
D = 1%
PART NOMENCLATURE
MQ 1N5221 B -1 (e3)
RoHS Compliance
e3 = RoHS Compliant (available
on commercial grade only)
Blank = non-RoHS Compliant
Metallurgically Bonded
Symbol
IR
IZ, IZT, IZK
I ZM
TSP
VR
VZ
ZZT or Z ZK
SYMBOLS & DEFINITIONS
Definition
Reverse Current: The maximum reverse (leakage) current that will flow at the specified voltage and temperature.
Regulator Current: The dc regulator current (IZ), at a specified test point (IZT), near breakdown knee (IZK).
Maximum Regulator (Zener) Current: The maximum rated dc current for the specified power rating.
Temperature Solder Pad: The maximum solder temperature that can be safely applied to the terminal.
Reverse Voltage: The reverse voltage dc value, no alternating component.
Zener Voltage: The Zener voltage the device will exhibit at a specified current (IZ) in its breakdown region.
Dynamic Impedance: The small signal impedance of the diode when biased to operate in its breakdown region at a
specified rms current modulation (typically 10% of IZT or IZK) and superimposed on IZT or IZK respectively.
T4-LDS-0232, Rev. 1 (111957)
©2011 Microsemi Corporation
Page 2 of 5

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1N5221B-1 thru 1N5281B-1
ELECTRICAL CHARACTERISTICS @ 25 oC unless otherwise noted.*
JEDEC
Type No.
(Note 1)
1N5221B-1
1N5222B-1
1N5223B-1
1N5224B-1
1N5225B-1
1N5226B-1
1N5227B-1
1N5228B-1
1N5229B-1
1N5230B-1
1N5231B-1
1N5232B-1
1N5233B-1
1N5234B-1
1N5235B-1
1N5236B-1
1N5237B-1
1N5238B-1
1N5239B-1
1N5240B-1
1N5241B-1
1N5242B-1
1N5243B-1
1N5244B-1
1N5245B-1
1N5246B-1
1N5247B-1
1N5248B-1
1N5249B-1
1N5250B-1
1N5251B-1
1N5252B-1
1N5253B-1
1N5254B-1
1N5255B-1
1N5256B-1
1N5257B-1
1N5258B-1
1N5259B-1
1N5260B-1
1N5261B-1
1N5262B-1
1N5263B-1
1N5264B-1
1N5265B-1
1N5266B-1
1N5267B-1
1N5268B-1
1N5269B-1
1N5270B-1
1N5271B-1
1N5272B-1
1N5273B-1
1N5274B-1
1N5275B-1
1N5276B-1
1N5277B-1
1N5278B-1
1N5279B-1
1N5280B-1
1N5281B-1
Nominal
Zener
Voltage
V Z @ IZT
Volts
2.4
2.5
2.7
2.8
3.0
3.3
3.6
3.9
4.3
4.7
5.1
5.6
6.0
6.2
6.8
7.5
8.2
8.7
9.1
10
11
12
13
14
15
16
17
18
19
20
22
24
25
27
28
30
33
36
39
43
47
51
56
60
62
68
75
82
87
91
100
110
120
130
140
150
160
170
180
190
200
T est
Current
IZT
mA
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
9.5
9.0
8.5
7.8
7.4
7.0
6.6
6.2
5.6
5.2
5.0
4.6
4.5
4.2
3.8
3.4
3.2
3.0
2.7
2.5
2.2
2.1
2.0
1.8
1.7
1.5
1.4
1.4
1.3
1.1
1.0
0.95
0.90
0.85
0.80
0.74
0.68
0.66
0.65
Max Zener Impedance
(Note 2)
ZZT @ IZT ZZK @ IZK = 0.25 mA
Ohms
30
30
30
30
29
28
24
23
22
19
17
11
7.0
7.0
5.0
6.0
8.0
8.0
10
17
22
30
13
15
16
17
19
21
23
25
29
33
35
41
44
49
58
70
80
93
105
125
150
170
185
230
270
330
370
400
500
750
900
1100
1300
1500
1700
1900
2200
2400
2500
Ohms
1200
1250
1300
1400
1600
1600
1700
1900
2000
1900
1600
1600
1600
1000
750
500
500
600
600
600
600
600
600
600
600
600
600
600
600
600
600
600
600
600
600
600
700
700
800
900
1000
1100
1300
1400
1400
1600
1700
2000
2200
2300
2600
3000
4000
4500
4500
5000
5500
5500
6000
6500
7000
Max Reverse Leakage
Current
IR @ VR
Volts
µA A B,C & D
100 0.95
1.0
100 0.95
1.0
75 0.95
1.0
75 0.95
1.0
50 0.95
1.0
25 0.95
1.0
15 0.95
1.0
10 0.95
1.0
5.0 0.95
1.0
50 1.9
2.0
5.0 1.9
2.0
5.0 2.9
3.0
5.0 3.3
3.5
5.0 3.8
4.0
3.0 4.8
5.0
3.0 5.7
6.0
3.0 6.2
6.5
3.0 6.2
6.5
3.0 6.7
7.0
3.0 7.6
8.0
2.0 8.0
8.4
1.0 8.7
9.1
0.5 9.4
9.9
0.1 9.5
10
0.1 10.5
11
0.1 11.4
12
0.1 12.4
13
0.1 13.3
14
0.1 13.3
14
0.1 14.3
15
0.1 16.2
17
0.1 17.1
18
0.1 18.1
19
0.1 20
21
0.1 20
21
0.1 22
23
0.1 24
25
0.1 26
27
0.1 29
30
0.1 31
33
0.1 34
36
0.1 37
39
0.1 41
43
0.1 44
46
0.1 45
47
0.1 49
52
0.1 53
56
0.1 59
62
0.1 65
68
0.1 66
69
0.1 72
76
0.1 80
84
0.1 86
91
0.1 94
99
0.1 101
106
0.1 108
114
0.1 116
122
0.1 123
129
0.1 130
137
0.1 137
144
0.1 144
152
Max Zener
Voltage
Temp. Coeff.
(Note 3)
α VZ (% / oC)
-0.085
-0.085
-0.080
-0.080
-0.075
-0.070
-0.065
-0.060
+/-0.055
+/-0.030
+/-0.030
+0.038
+0.038
+0.045
+0.050
+0.058
+0.062
+0.065
+0.068
+0.075
+0.076
+0.077
+0.079
+0.082
+0.082
+0.083
+0.084
+0.085
+0.086
+0.086
+0.087
+0.088
+0.089
+0.090
+0.091
+0.091
+0.092
+0.093
+0.094
+0.095
+0.095
+0.096
+0.096
+0.097
+0.097
+0.097
+0.098
+0.098
+0.099
+0.099
+0.110
+0.110
+0.110
+0.110
+0.110
+0.110
+0.110
+0.110
+0.110
+0.110
+0.110
*JEDEC registered data. JEDEC type numbers listed indicate a tolerance of +/- 5%. 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.
T4-LDS-0232, Rev. 1 (111957)
©2011 Microsemi Corporation
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1N5221B-1 thru 1N5281B-1
NOT ES:
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 = 20 mA, T 1 = 25 oC, T 2 = 125 oC (1N5221A, B thru 1N5242A, B).
b. IZT = Rated I ZT , T 1 = 25 oC, T 2 = 125 oC (1N5243A, B thru 1N5281A, B).
(Device to be temperature stabilized with current applied prior to reading breakdown voltage at the specified ambient temp.)
GRAPHS
TL Lead Temperature at 3/8” From
Body or TA on FR4 PC Board
FIGURE 1
POWER DERATING CURVE
Zener Voltage VZ
FIGURE 2
CAPACITANCE vs. ZENER VOLTAGE (TYPICAL)
T4-LDS-0232, Rev. 1 (111957)
©2011 Microsemi Corporation
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1N5221B-1 thru 1N5281B-1
PACKAGE DIMENSIONS
Dimensions
Ltr Inch
Millimeters
Notes
Min Max Min Max
BD .055 .090 1.40 2.29
3
BL .120 .200 3.05 5.08
3
LD .018 .022 0.46 0.56
LL 1.000 1.500 25.40 38.10
LL1 .050 1.27 4
NOTES:
1. Dimensions are in inch.
2. Millimeters are given for general information only.
3. Package contour optional within BD and length BL. Heat slugs, if any, shall be included within this cylinder
but shall not be subject to minimum limit of BD. The BL dimension shall include the entire body including
slugs.
4. W ithin this zone lead, diameter may vary to allow for lead finishes and irregularities other than heat slugs.
5. In accordance with ASME Y14.5M, diameters are equivalent to Φx symbology.
T4-LDS-0232, Rev. 1 (111957)
©2011 Microsemi Corporation
Page 5 of 5