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MMBZ5221B - MMBZ5257B — Zener Diodes
November 2015
MMBZ5221B - MMBZ5257B
Zener Diodes
Tolerance = 5%
3
CONNECTION
DIAGRAM
3
2
1
SOT-23
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 T
A
= 25°C unless otherwise noted.
Symbol
P
D
R
θJA
Power Dissipation
Parameter
Referencing R
θJA
, T
A
= 25°C
Referencing
ψ
JL
, T
L
= 25°C
Value
250
550
465
220
-55 to +150
+150
Unit
mW
°C/W
°C/W
°C
°C
Junction-to-Ambient Thermal Resistance
(3)
Junction-to-Lead Thermal Characteristics
(with reference to Cathode)
Storage Temperature Range
Operating Junction Temperature
ψ
JL
T
STG
T
J
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
MMBZ5221B - MMBZ5257B — Zener Diodes
Typical Performance Characteristics
35
5000
V
Z
- ZENER VOLTAGE (V)
25
20
15
10
5
1
V
Z
= 5.1V
V
Z
= 3.3V
T
A
= 25
º
C
Z
Z
- IMPEDANCE (ohms)
30
V
Z
= 33.0V
2000
1000
500
V
Z
= 3.3V
200
100
50
V
Z
= 5.1V
T
A
= 25
º
C
V
Z
= 33.0V
V
Z
= 12.0V
20
10
V
Z
= 12.0V
5
2
1
0.1
2
5
10
I
Z
- ZENER CURRENT (mA)
20
30
0.2
0.5
1
2
5
I
Z
- ZENER CURRENT (mA)
10
20
Figure 1. Zener Current vs. Zener Voltage
5
Figure 2. Zener Current vs. Zener Impedence
V
Z
= 3.3V
6
V
Z
= 5.1V
V
Z
- ZENER VOLTAGE (V)
4
T
A
= -25
º
C
T
A
= 25
º
C
V
Z
- ZENER VOLTAGE (V)
5.5
T
A
= 125
º
C
3
T
A
= 85
º
C
5
T
A
= 100
º
C
T
A
= 25
º
C
T
A
= -25
º
C
T
A
= 85
º
C
2
T
A
= 100
º
C
T
A
= 125
º
C
4.5
1
4
1
2
5
10
I
Z
- ZENER CURRENT (mA)
20
30
1
2
5
10
I
Z
- ZENER CURRENT (mA)
20
30
Figure 3. 3.3 Zener Voltage vs. Temperature
Figure 4. 5.1 Zener Voltage vs. Temperature
15
V
Z
= 12.0V
40
T
A
= 125
º
C
V
Z
= 33.0V
T
A
= 100
º
C
T
A
= 125
º
C
10
T = -25
º
C
A
T
A
= 25
º
C
T
A
= 85
º
C
T
A
= 100
º
C
V
Z
- ZENER VOLTAGE (V)
V
Z
- ZENER VOLTAGE (V)
35
30
T
A
= -25
º
C
T
A
= 25
º
C
T
A
= 85
º
C
5
25
0
1
2
5
10
I
Z
- ZENER CURRENT (mA)
20
30
20
1
2
5
10
I
Z
- ZENER CURRENT (mA)
20
30
Figure 5. 12 Zener Voltage vs. Zener Temperature
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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