BYW178
Vishay Semiconductors
Ultra Fast Avalanche Sinterglass Diode
FEATURES
• Glass passivated junction
• Hermetically sealed package
• Low reverse current
• Soft recovery characteristics
• Very fast reverse recovery time
• Low reverse recovery peak current
949588
• Compliant to RoHS directive 2002/95/EC and in
accordance to WEEE 2002/96/EC
• Halogen-free according to IEC 61249-2-21 definition
MECHANICAL DATA
Case:
SOD-64
Terminals:
plated axial leads, solderable per MIL-STD-750,
method 2026
Polarity:
color band denotes cathode end
Mounting position:
any
Weight:
approx. 858 mg
APPLICATIONS
• Ultra fast rectification diode for switching mode power
supplies
PARTS TABLE
PART
BYW178
TYPE DIFFERENTIATION
V
R
= 800 V; I
FAV
= 3 A
PACKAGE
SOD-64
ABSOLUTE MAXIMUM RATINGS
(T
amb
= 25 °C, unless otherwise specified)
PARAMETER
Reverse voltage = repetitive peak reverse
voltage
Peak forward surge current
Repetitive peak forward current
Average forward current
Junction and storage temperature range
Non repetitive reverse
I
(BR)R
= 0.4 A
TEST CONDITION
See electrical characteristics
t
p
= 10 ms, half sine wave
PART
BYW178
SYMBOL
V
R
= V
RRM
I
FSM
I
FRM
I
FAV
T
j
= T
stg
E
R
VALUE
800
80
15
3
- 55 to + 175
20
UNIT
V
A
A
A
°C
mJ
MAXIMUM THERMAL RESISTANCE
(T
amb
= 25 °C, unless otherwise specified)
PARAMETER
Junction lead
Junction ambient
TEST CONDITION
Lead length l = 10 mm, T
L
= constant
On PC board with spacing 37.5 mm
SYMBOL
R
thJL
R
thJA
VALUE
25
70
UNIT
K/W
K/W
ELECTRICAL CHARACTERISTICS
(T
amb
= 25 °C, unless otherwise specified)
PARAMETER
Forward voltage
Reverse current
Reverse recovery current
Reverse recovery time
Reverse recovery time (JEDEC)
TEST CONDITION
I
F
= 3 A
V
R
= V
RRM
V
R
= V
RRM
, T
j
= 100 °C
I
F
= 1 A, dI
F
/dt
≤
- 50 A/μs, V
Batt
= 200 V
I
F
= 1 A, dI
F
/dt
≤
- 50 A/μs,
V
Batt
= 200 V, i
R
= 0.25 x l
RM
I
F
= 0.5 A, l
R
= 1 A, i
R
= 0.25 A
SYMBOL
V
F
I
R
I
R
l
RM
t
rr
t
rr
MIN.
-
-
-
-
-
-
TYP.
-
-
-
2.2
50
-
MAX.
1.9
1
20
-
-
60
UNIT
V
μA
μA
A
ns
ns
Document Number: 86047
Rev. 1.7, 04-Aug-10
For technical questions within your region, please contact one of the following:
DiodesAmericas@vishay.com, DiodesAsia@vishay.com, DiodesEurope@vishay.com
www.vishay.com
1
BYW178
Vishay Semiconductors
Ultra Fast Avalanche Sinterglass
Diode
TYPICAL CHARACTERISTICS
(T
amb
= 25
°C,
unless otherwise specified)
R
thJA
- Therm.Resist. Junction/Ambient (K/W)
40
3.5
I
FAV
–Average Forward Current( A )
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
20
R
thJA
≤
70 K/W
PCB: d = 25 mm
V
R
= V
RRM
half sinewave
R
thJA
≤
25 K/W
l = 10mm
30
20
l
l
10
T
L
= constant
0
0
5
10
15
20
25
30
94 9570
I - Lead Length (mm)
16459
60 80 100 120 140 160 180
T
amb
– Ambient Temperature (°C )
40
Fig. 1 - Typ. Thermal Resistance vs. Lead Length
Fig. 4 - Max. Average Forward Current vs. Ambient Temperature
I
RM
– Reverse Recovery Current (A )
5
dI
F
/dt = 50A/μs
4
I
R
– Reverse Current (A )
1000
V
R
= V
RRM
100
3
2
1
0
0.1
1
I
F
– Forward Current ( A )
10
10
1
25
16460
94 9571
50
75
100 125 150 175
T
j
– Junction Temperature ( °C )
Fig. 2 - Typ. Reverse Recovery Current vs. Forward Current
Fig. 5 - Reverse Current vs. Junction Temperature
P – Reverse Power Dissipation ( mW)
R
100.000
– Forward Current (A)
400
350
300
250
200
150
100
50
0
25
50
75
100 125 150 175
T
j
– Junction Temperature (°C )
P
R
–Limit
@100 % V
R
V
R
= V
RRM
10.000
1.000
T
j
= 175°C
T
j
= 25 °C
0.100
0.010
P
R
–Limit
@ 80 % V
R
I
0.001
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
16458
V
F
– Forward Voltage ( V )
F
16461
Fig. 3 - Forward Current vs. Forward Voltage
Fig. 6 - Max Reverse Power Dissipation vs. Junction Temperature
www.vishay.com
2
For technical questions within your region, please contact one of the following:
DiodesAmericas@vishay.com, DiodesAsia@vishay.com, DiodesEurope@vishay.com
Document Number: 86047
Rev. 1.7, 04-Aug-10
BYW178
Ultra Fast Avalanche Sinterglass
Diode
Vishay Semiconductors
90
C
D
– Diode Capacitance ( pF )
80
70
60
50
40
30
20
10
0
0.1
f = 1 MHz
16462
1.0
10.0
V
R
– Reverse Voltage ( V )
100.0
Fig. 7 - Diode Capacitance vs. Reverse Voltage
Z
thp
- Thermal Resist. for Pulse Cond. (K/W)
1000
V
RRM
= 600 V
R
thJA
= 70 K/W
100
t
p
/T = 0.5
0.2
10
0.1
0.05
0.02
0.01
1
10
-4
949562
T
amb
= 25 °C
100 °C
45 °C
70 °C
10
-3
10
-2
10
-1
10
-0
10
1
10
2
10
0
10
1
10
2
t
p
- Pulse Length (s)
I
FRM
- Repetitive Peak
Forward Current (A)
Fig. 8 - Thermal Response
PACKAGE DIMENSIONS
in millimeters (inches):
SOD-64
Sintered Glass Case
SOD-64
Cathode Identification
4.3 (0.168) max.
1.35 (0.053) max.
26(1.014) min.
4 (0.156) max.
26 (1.014) min.
Document-No.: 6.563-5006.4-4
Rev. 3 - Date: 09.February.2005
94 9587
Document Number: 86047
Rev. 1.7, 04-Aug-10
For technical questions within your region, please contact one of the following:
DiodesAmericas@vishay.com, DiodesAsia@vishay.com, DiodesEurope@vishay.com
www.vishay.com
3
Legal Disclaimer Notice
Vishay
Disclaimer
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively,
“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
disclosure relating to any product.
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all
liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,
consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular
purpose, non-infringement and merchantability.
Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of typical
requirements that are often placed on Vishay products in generic applications. Such statements are not binding statements
about the suitability of products for a particular application. It is the customer’s responsibility to validate that a particular
product with the properties described in the product specification is suitable for use in a particular application. Parameters
provided in datasheets and/or specifications may vary in different applications and performance may vary over time. All
operating parameters, including typical parameters, must be validated for each customer application by the customer’s
technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase,
including but not limited to the warranty expressed therein.
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining
applications or for any other application in which the failure of the Vishay product could result in personal injury or death.
Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk and agree
to fully indemnify and hold Vishay and its distributors harmless from and against any and all claims, liabilities, expenses and
damages arising or resulting in connection with such use or sale, including attorneys fees, even if such claim alleges that Vishay
or its distributor was negligent regarding the design or manufacture of the part. Please contact authorized Vishay personnel to
obtain written terms and conditions regarding products designed for such applications.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by
any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000
Revision: 11-Mar-11
www.vishay.com
1
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