Standard Avalanche Sinterglass Diode
Features
• Glass passivated junction
• Hermetically sealed package
• Lead (Pb)-free component
• Component in accordance to RoHS 2002/95/EC
and WEEE 2002/96/EC
Applications
High voltage rectification diode
Efficiency diode in horizontal deflection circuits
e2
BY448 / BY458
Vishay Semiconductors
949539
Mechanical Data
Case: SOD-57 Sintered glass case
Terminals: Plated axial leads, solderable per
Polarity: Color band denotes cathode end
Mounting Position: Any
Weight: approx. 369 mg
MIL-STD-750, Method 2026
Parts Table
Part Type differentiation Package
BY448 V
BY458 V
= 1500 V; I
R
= 1200 V; I
R
= 2 A SOD-57
FAV
= 2 A SOD-57
FAV
Absolute Maximum Ratings
T
= 25 °C, unless otherwise specified
amb
Parameter Test condition Part Symbol Val ue Unit
Reverse voltage see electrical characteristics BY448 V
BY458 V
Peak forward surge current t
Average forward current I
Junction temperature T
Storage temperature range T
Non repetitive reverse
avalanche energy
= 10 ms, half sinewave I
p
I
= 0.4 A E
(BR)R
R
R
= V
= V
FSM
FAV
stg
j
R
RRM
RRM
1500 V
1200 V
30 A
2A
140 °C
- 55 to + 175 °C
10 mJ
Maximum Thermal Resistance
T
= 25 °C, unless otherwise specified
amb
Parameter Test condition Symbol Val ue Unit
Junction ambient l = 10 mm, T
on PC board with spacing
25 mm
Document Number 86006
Rev. 1.6, 14-Apr-05
= constant R
L
thJA
R
thJA
45 K/W
100 K/W
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1
BY448 / BY458
Vishay Semiconductors
Electrical Characteristics
T
= 25 °C, unless otherwise specified
amb
Parameter Test condition Symbol Min Ty p. Max Unit
Forward voltage I
Reverse current V
Total reverse recovery time I
Reverse recovery time I
Typical Characteristics (Tamb = 25 °C unless otherwise specified)
= 3 A V
F
= V
R
RRM
V
= V
R
= 1 A, - diF/dt = 0.05 A/µst
F
= 0.5 A, IR = 1 A, iR = 0,25 A t
F
, Tj = 140 °C I
RRM
F
I
R
R
rr
rr
1.6 V
3 µA
140 µA
20 µs
2 µs
120
ll
100
80
TL= constant
60
40
20
0
thJA
0
R Therm. Resist. Junction/Ambient (K/W)
94 9101
51015 25
l - Lead Length ( mm )
20
Figure 1. Typ. Thermal Resistance vs. Lead Length
100
T
150°C
=
j
10
1
Tj=25°C
0.1
F
0.01
I - Forward Current ( A )
30
2.5
2.0
1.5
1.0
0.5
R
= 100 K/W
thJA
PCB:d=25mm
0
0755025 125100 150
T
- Ambient Temperature ( ° C)
amb
16418
FA
I - Average Forward Current ( A )
=V
V
R
RRM
half sinewave
R
= 45 K/W
thJA
l=10mm
Figure 3. Max. Average Forward Current vs. Ambient Temperature
1000
VR=V
RRM
100
10
R
I - Reverse Current ( µA)
0.001
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
16417
Figure 2. Forward Current vs. Forward Voltage
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2
VF- Forward V oltage(V)
1
25 50 75 100 125 150
16419
Tj- Junction T emperature ( ° C)
Figure 4. Reverse Current vs. Junction Temperature
Document Number 86006
Rev. 1.6, 14-Apr-05
BY448 / BY458
Vishay Semiconductors
400
350
300
250
200
150
100
50
R
P - Reverse Power Dissipation ( mW )
0
25 50 75 100 125 150
16420
Tj- Junction Temperature ( °C)
@80%V
PR-Limit
VR=V
PR-Limit
@100 % V
R
RRM
R
Figure 5. Max. Reverse Power Dissipation vs. Junction
Temperature
Package Dimensions in mm (Inches)
Sintered Glass Case
SOD-57
Cathode Identification
35
30
25
20
15
10
D
C - Diode Capacitance ( pF )
16421
3.6 (0.140)max.
f= 1 MHz
5
0
0.1 1 10 100
VR- Reverse Voltage(V)
Figure 6. Diode Capacitance vs. Reverse Voltage
94 9538
ISO Method E
0.82 (0.032) max.
26(1.014) min.
Document Number 86006
Rev. 1.6, 14-Apr-05
4.0 (0.156) max.
26(1.014) min.
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3
BY448 / BY458
Vishay Semiconductors
Ozone Depleting Substances Policy Statement
It is the policy of Vishay Semiconductor GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating
systems with respect to their impact on the health and safety of our employees and the public, as well as
their impact on the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are
known as ozone depleting substances (ODSs).
The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs
and forbid their use within the next ten years. Various national and international initiatives are pressing for an
earlier ban on these substances.
Vishay Semiconductor GmbH has been able to use its policy of continuous improvements to eliminate the use
of ODSs listed in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments
respectively
2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency (EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively.
Vishay Semiconductor GmbH can certify that our semiconductors are not manufactured with ozone depleting
substances and do not contain such substances.
We reserve the right to make changes to improve technical design
and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each
customer application by the customer. Should the buyer use Vishay Semiconductors products for any
unintended or unauthorized application, the buyer shall indemnify Vishay Semiconductors against all
claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal
damage, injury or death associated with such unintended or unauthorized use.
Vishay Semiconductor GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
www.vishay.com
4
Document Number 86006
Rev. 1.6, 14-Apr-05
Legal Disclaimer Notice
Vishay
Notice
Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc.,
or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, by
estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's
terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express
or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify Vishay for any damages resulting from such improper use or sale.
Document Number: 91000 www.vishay.com
Revision: 08-Apr-05 1
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