This is information on a product in full production.
December 2012 Doc ID 2973 Rev 5 1/8
8
BZW50
Transil™, transient voltage surge suppressor (TVS)
Datasheet production data
Features
■Peak pulse power: 5000 W (10/1000 µs)
■Stand-off voltage range from 10 V to 180 V
■Unidirectional and bidirectional types
■Low clamping factor
■Fast response time
■UL497B, file number: QVGQ2.E136224
Description
Transil diodes provide high overvoltage protection
by clamping action. Their instantaneous response
to transient overvoltages makes them particularly
suited to protect voltage sensitive devices such as
MOS Technology and low voltage supplied ICs.
TM:Transil is a trademarks of STMicroelectronics.
R6
www.st.com
Characteristics BZW50
2/8 Doc ID 2973 Rev 5
1 Characteristics
Figure 1. Electrical characteristics - definitions
Figure 2. Pulse definition for electrical characteristics
Table 1. Absolute maximum ratings (Tamb = 25 °C)
Symbol Parameter Value Unit
PPP Peak pulse power dissipation(1) T
j initial = Tamb 5000 W
P Power dissipation on infinite heatsink Tamb = 75 °C 6.5 W
IFSM Non repetitive surge peak forward current for unidirectional types tp = 10 ms
Tj initial = Tamb
500 A
Tstg Storage temperature range -65 to + 175 °C
TjMaximum operating junction temperature 175 °C
TLMaximum lead temperature for soldering during 10 s at 5 mm from case. 260 °C
1. For a surge greater than the maximum values, the diode will fail in short-circuit.
Table 2. Thermal resistances
Symbol Parameter Value Unit
Rth(j-l) Junction to leads 15 °C/W
Rth(j-a) Junction to ambient on printed circuit. L lead = 10 mm 65
V
CL
V
BR
V
RM
I
RM
I
R
I
PP
V
I
I
RM
I
R
I
PP
V
RM
V
BR
V
CL
V
CL
V
BR
V
RM
I
RM
I
R
I
PP
V
I
I
RM
I
R
I
PP
V
RM
V
BR
V
CL
V
CL
V
BR
V
RM
I
RM
I
R
I
PP
V
I
I
F
V
F
V
CL
V
BR
V
RM
I
RM
I
R
I
PP
V
I
I
F
V
F
Unidirectional
Bidirectional
Symbol Parameter
V Stand-off voltage
V Breakdown voltage
V Clamping voltage
I Leakage current @ V
I Peak pulse current
T Voltage temperature coefficient
V Forward voltage drop
R Dynamic resistance
RM
BR
CL
RM RM
PP
F
D
α
Repetitive pulse current
tr= rise time (µs)
tp= pulse duration time (µs)
trtp
BZW50 Characteristics
Doc ID 2973 Rev 5 3/8
Table 3. Electrical characteristics - values (Tamb = 25 °C)
Order code
IRM @ VRM VBR @ IR(1) VCL @ IPP
10/1000 µs
VCL @ IPP
8/20µs
T(2) C(3)
max min max max max typ
Unidirectional Bidirectional µA V V mA V A V A 10-4/ °C pF
BZW50-10 BZW50-10B 5 10 11.1 1 18.8 266 23.4 2564 7.8 24000
BZW50-12 BZW50-12B 5 12 13.3 1 22 227 28 2143 8.4 18500
BZW50-15 BZW50-15B 5 15 16.6 1 26.9 186 35 1714 8.8 13500
BZW50-18 BZW50-18B 5 18 20 1 32.2 155 41.5 1446 9.2 11500
BZW50-22 BZW50-22B 5 22 24.4 1 39.4 127 51 1177 9.6 8500
BZW50-27 BZW50-27B 5 27 30 1 48.3 103 62 968 9.8 7000
BZW50-33 BZW50-33B 5 33 36.6 1 59 85 76 789 10 5750
BZW50-39 BZW50-39B 5 39 43.3 1 69.4 72 90 667 10.1 4800
BZW50-47 BZW50-47B 5 47 52 1 83.2 60.1 108 556 10.3 4100
BZW50-56 BZW50-56B 5 56 62.2 1 99.6 50 129 465 10.4 3400
BZW50-68 BZW50-68B 5 68 75.6 1 121 41 157 382 10.5 3000
BZW50-82 BZW50-82B 5 82 91 1 145 34 189 317 10.6 2600
BZW50-100 BZW50-100B 5 100 111 1 179 28 228 263 10.7 2300
BZW50-120 BZW50-120B 5 120 133 1 215 23 274 219 10.8 1900
BZW50-150 BZW50-150B 5 150 166 1 269 19 343 175 10.8 1700
BZW50-180 BZW50-180B 5 180 200 1 322 16 410 146 10.8 1500
1. Pulse test: tp < 50 ms.
2. VBR = T · (Tamb - 25) · VBR(25°C).
3. VR = 0 V, F = 1 MHz. For bidirectional types, capacitance value is divided by 2.
Characteristics BZW50
4/8 Doc ID 2973 Rev 5
Figure 3. Peak power dissipation vs. initial
junction temperature
(printed circuit board)
Figure 4. Peak pulse power vs. exponential
pulse duration
0
0
20
40
60
80
100
20 40 60 80 100 120 140 160 180 200
%
Tjinitial(°C)
0.001 0.01 0.1 1 10 100
1E2
1E3
1E4
1E5
1E6
1E7
Pp(W)
p
tp(ms)EXPO.
Tjinitial(°C)
Figure 5. Clamping voltage vs. peak pulse
current(1) Figure 6. Capacitance vs. reverse applied
voltage for unidirectional types
(typical values).
1. The curves in Figure 5 are specified for a junction temperature of 25 °C before surge. The given results may be
extrapolated for other junction temperatures by using the following formula: VBR = T x [Tamb -25] x VBR(25 °C)
For intermediate voltages, extrapolate the given results.
0.1 1 10 100 1000 10000
10
100
1000
V
CL
Ipp (A)
V(V)
CL
Ipp (A)
BZW50-180
BZW50- 82BZW50- 82
BZW50- 82BZW50- 39
BZW50- 12BZW50- 18
BZW50- 12BZW50- 10
t
%Ipp
100
50
0
trt<10 s
r
tt
%Ipp
100
50
0
trt<10 s
r
tp
Tjinitial(°C)
C(nF)
110100
1
10
100
V(V)
R
BZW50-39
BZW50-82
BZW50-180
BZW50-10
BZW50-18
0.1
500
Tj= 25 °C
F = 1 MHz
Figure 7. Capacitance vs. reverse applied
voltage for bidirectional types
(typical values)
Figure 8. Peak forward voltage drop vs. peak
forward current for unidirectional
types (typical value).(1)
1. Multiply by 2 for units with VBR > 220 V.
BZW50 Ordering information scheme
Doc ID 2973 Rev 5 5/8
2 Ordering information scheme
Figure 11. Ordering information scheme
Figure 9. Transient thermal impedance
junction to ambient vs. pulse
duration
Figure 10. Relative variation of leakage
current vs. junction temperature
0.01 0.1 1 10 100 1000
1
10
100
Zth (j-a) (°C/W)
t (s)
p
BZW 50 10 CA RL
Transil
Peak Pulse Power
Breakdown Voltage
Packaging
50 = 5000 W
100 = 100 V
Blank = Ammopack tape
RL = Tape and reel
Types
A = Unidirectional
CA = Bidirectional
Package information BZW50
6/8 Doc ID 2973 Rev 5
3 Package information
●Epoxy meets UL94, V0
●Lead-free package
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Table 4. R6 Dimensions
Ref.
Dimensions
Millimeters Inches
Min. Max. Min. Max.
A 8.6 9.1 0.338 0.358
B25.4 1
Ø C 8.6 9.1 0.338 0.358
Ø D 1.2 1.3 0.047 0.051
Table 5. Marking
Unidirectional
order code Marking Bidirectional
order code Marking
BZW50-10 BZW50-10 BZW50-10B BZW50-10B
BZW50-12 BZW50-12 BZW50-12B BZW50-12B
BZW50-15 BZW50-15 BZW50-15B BZW50-15B
BZW50-18 BZW50-18 BZW50-18B BZW50-18B
BZW50-22 BZW50-22 BZW50-22B BZW50-22B
BZW50-27 BZW50-27 BZW50-27B BZW50-27B
BZW50-33 BZW50-33 BZW50-33B BZW50-33B
BZW50-39 BZW50-39 BZW50-39B BZW50-39B
BZW50-47 BZW50-47 BZW50-47B BZW50-47B
BZW50-56 BZW50-56 BZW50-56B BZW50-56B
BZW50-68 BZW50-68 BZW50-68B BZW50-68B
BZW50-82 BZW50-82 BZW50-82B BZW50-82B
BZW50-100 BZW50-100 BZW50-100B BZW50-100B
BZW50-120 BZW50-120 BZW50-120B BZW50-120B
BZW50-150 BZW50-150 BZW50-150B BZW50-150B
BZW50-180 BZW50-180 BZW50-180B BZW50-180B
ØC
ØD
A
BB
BZW50 Ordering information
Doc ID 2973 Rev 5 7/8
4 Ordering information
5 Revision history
Table 6. Ordering information
Order code Marking(1)
1. Logo, date code, type code, cathode band (for unidirectional types only).
Package Weight Base qty Delivery mode
BZW50xxxx
See Ta b l e 5 R6 2.050g
1000 Tape and reel
BZW50xxxxB
BZW50xxxxRL 100 Ammopack
BZW50xxxxBRL
Table 7. Document revision history
Date Revision Changes
Feb-2003 4 Last update
14-Dec-2012 5 Updated ECOPACK statement.
BZW50
8/8 Doc ID 2973 Rev 5
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