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November 2015
MMBZ5221B - MMBZ5257B
Zener Diodes
Tolerance = 5%
3
2
1
SOT-23
CONNECTION
DIAGRAM
3
1 2 NC
Absolute Maximum Ratings(1, 2)
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted.
Symbol
Parameter
Value
Unit
PD
RθJA
ψJL
TSTG
TJ
Power Dissipation
Referencing RθJA, TA = 25°C
Referencing ψJL, TL = 25°C
Junction-to-Ambient Thermal Resistance(3)
Junction-to-Lead Thermal Characteristics
(with reference to Cathode)
Storage Temperature Range
Operating Junction Temperature
250
550
465
220
-55 to +150
+150
mW
°C/W
°C/W
°C
°C
Note:
1.These ratings are based on a maximum junction temperature of 150°C.
2.These are steady state limits. The factory should be consulted on applications involving pulsed or low duty cycle
operations.
3. Device mounted on FR-4 PCB, board size = 76.2 mm x 114.3 mm
© 2004 Fairchild Semiconductor Corporation
MMBZ5221B - MMBZ5257B Rev. 1.5
www.fairchildsemi.com

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Electrical Characteristics
Values are at TA = 25°C unless otherwise noted.
Device
MMBZ5221B
MMBZ5223B
MMBZ5226B
MMBZ5227B
MMBZ5228B
MMBZ5229B
MMBZ5230B
MMBZ5231B
MMBZ5232B
MMBZ5233B
MMBZ5234B
MMBZ5235B
MMBZ5236B
MMBZ5237B
MMBZ5238B
MMBZ5239B
MMBZ5240B
MMBZ5241B
MMBZ5242B
MMBZ5243B
MMBZ5244B
MMBZ5245B
MMBZ5246B
MMBZ5247B
Mark
18A
18C
8A
8B
8C
8D
8E
8F
8G
8H
8J
8K
8L
8M
8N
8P
8Q
8R
8S
8T
8U
8V
8W
8X
Min.
2.28
2.565
3.135
3.42
3.705
4.085
4.465
4.845
5.32
5.7
5.89
6.46
7.125
7.79
8.265
8.645
9.5
10.45
11.4
12.35
13.3
14.25
15.2
16.15
VZ(V) @ IZ(mA)
Nor. Max. IZ(mA)
2.4 2.52 20
2.7 2.835
3.3 3.465
3.6 3.78
20
20
20
3.9 4.095 20
4.3 4.515 20
4.7 4.935
5.1 5.355
5.6 5.88
6.0 6.3
20
20
20
20
6.2 6.51
6.8 7.14
7.5 7.875
8.2 8.61
20
20
20
20
8.7 9.135
9.1 9.555
10 10.5
11 11.55
12 12.6
20
20
20
20
20
13 13.65 9.5
14 14.7 9.0
15 15.75 8.5
16 16.8 7.8
17 17.85 7.4
ZZ(Ω) @ IZ(mA)
30 20
30 20
28 20
24 20
23 20
22 20
19 20
17 20
11 20
7.0 20
7.0 20
5.0 20
6.0 20
8.0 20
8.0 20
10 20
17 20
22 20
30 20
13 9.5
15 9.0
16 8.5
17 7.8
19 7.4
ZZK(Ω) @ IZK(mA)
1,200
1,300
1,600
1,700
1,900
1,000
1,900
1,600
1,600
1,600
1,000
750
500
500
600
600
600
600
600
600
600
600
600
600
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
IR(μA) @ VR(V)
100 1.0
75 1.0
25 1.0
15 1.0
10 1.0
5.0 1.0
5.0 2.0
5.0 2.0
5.0 3.0
5.0 3.5
5.0 4.0
3.0 5.0
3.0 6.0
3.0 6.5
3.0 6.5
3.0 7.0
3.0 8.0
2.0 8.4
1.0 9.1
0.5 9.9
0.1 10
0.1 11
0.1 12
0.1 13
MMBZ5248B 8Y 17.1 18 18.9 7.0
MMBZ5249B 8Z 18.05 19 19.95 6.6
MMBZ5250B 81A 19 20 21 6.2
MMBZ5251B 81B 20.9 22 23.1 5.6
MMBZ5252B 81C 22.8 24 25.2 5.2
21 7.0
23 6.6
25 6.2
29 5.6
33 5.2
600 0.25 0.1 14
600 0.25 0.1 14
600 0.25 0.1 15
600 0.25 0.1 17
600 0.25 0.1 18
MMBZ5253B 81D 23.75 25 26.25 5.0
MMBZ5254B 81E 25.65 27 28.35 4.6
MMBZ5255B 81F 26.6 28 29.4 4.5
MMBZ5256B 81G 28.5 30 31.5 4.2
MMBZ5257B 81H 31.35 33 34.65 3.8
35 5.0
41 4.6
44 4.5
49 4.2
58 3.8
600
600
600
600
600
VF Forward Voltage = 0.9 V Maximum at IF = 10 mA for all MMBZ5200 series
0.25
0.25
0.25
0.25
0.25
0.1
0.1
0.1
0.1
0.1
19
21
21
23
25
© 2004 Fairchild Semiconductor Corporation
MMBZ5221B - MMBZ5257B Rev. 1.5
2
www.fairchildsemi.com

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Typical Performance Characteristics
35
30 VZ = 33.0V
25
20
15
VZ = 12.0V
10
V Z = 5.1V
5
V Z = 3.3V
TA = 25º C
12
5 10 20 30
I Z- ZENER CURRENT (mA)
Figure 1. Zener Current vs. Zener Voltage
5
V Z = 3.3V
4
TA = -25º C
TA = 25º C
3
TA = 85º C
2 T A = 100ºC
T A= 125ºC
1
12
5 10 20 30
I Z- ZENER CURRENT (mA)
Figure 3. 3.3 Zener Voltage vs. Temperature
15
V Z = 12.0V
TA = 125º C
10 TA = -25º C TA = 25º C
TA = 85º C
TA = 100ºC
5
5000
2000
1000
500
VZ = 5.1V
VZ = 3.3V
TA = 25º C
200
100
50 V Z = 33.0V
20
10 V Z = 12.0V
5
2
1
0.1 0.2
0.5 1
2
5 10
I Z - ZENER CURRENT (mA)
20
Figure 2. Zener Current vs. Zener Impedence
6
VZ = 5.1V
5.5
TA = 125º C
5 TA = 100ºC
4.5 TA = 25º C
TA = -25º C
TA = 85º C
4
12
5 10 20 30
I Z - ZENER CURRENT (mA)
Figure 4. 5.1 Zener Voltage vs. Temperature
40
V Z = 33.0V
35
TA = 100º C
TA = 125º C
30 TA = -25º C
25
TA = 25º C
TA = 85º C
0
12
5 10 20 30
I Z- ZENER CURRENT (mA)
Figure 5. 12 Zener Voltage vs. Zener Temperature
20
12
5 10 20 30
I Z - ZENER CURRENT (mA)
Figure 6. 33 Zener Voltage vs. Zener Temperature
© 2004 Fairchild Semiconductor Corporation
MMBZ5221B - MMBZ5257B Rev. 1.5
3
www.fairchildsemi.com

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PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification Product Status
Advance Information Formative / In Design
Preliminary
First Production
No Identification Needed
Full Production
Obsolete
Not In Production
Definition
Datasheet contains the design specifications for product development. Specifications may change
in any manner without notice.
Datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild
Semiconductor reserves the right to make changes at any time without notice to improve design.
Datasheet contains final specifications. Fairchild Semiconductor reserves the right to make
changes at any time without notice to improve the design.
Datasheet contains specifications on a product that is discontinued by Fairchild Semiconductor.
The datasheet is for reference information only.
Rev. I77
© Fairchild Semiconductor Corporation
www.fairchildsemi.com