Thick Film Power Resistors
Type BDS250/400 Series
Type BDS250/400 Series
Characteristics -
Electrical
Resistance Range:
Resistance Tolerance:
TCR:
Rated Power:
Capacitance:
Series Inductance:
Limiting Element Voltage:
Isolating Voltage:
Single Shot Voltage:
Insulation Resistance:
Partial Discharge:
Heat Dissipation:
0R47 - 1M
± 10%, 5% (Tighter by discussion)
R<1Ω
± 250ppm/°C
R>1Ω
± 150ppm/°C
Heatsink: 100°C / 70°C
250W / 400W
Parallel
40pF
To Earth
160pF
40nH (Maximum)
5kV dc/ac rms
(Terminal to Heatsink)
7kV ac rms
1.5/50ms
12kV
(at 500V dc)
>100GΩ
at 7.5kV
<10pC
Although the use of proprietary heat sinks with lower thermal resistance is
acceptable, up rating is not recommended. The use of proprietary heat sink
compound to improve thermal conductivity is essential.
With less than 40nH inductance and
a 250W or 400W power rating
(100°C/70°C
Heatsink)
in
a
67mm x 60mm casing, the
BDS250/400 offers high power
density over a wide range of ohmic
values (0R47 – 1M0) and benefits
from 10 years experience in the field.
Available in 5 resistor configurations
with 2 or 4 easy to connect terminals,
the resistors are made from quality
materials for optimum reliability
and stability with very low partial
discharge.
Tyco can test resistors to conform to
relevant customer specifications,
and will advise on the use of resistors
for pulse energy and high voltage
applications (HV designs available).
Resistors with 1% tolerance,
alternative terminations or flying
leads are available, and custom
designs are welcome.
This product is available via
distribution.
Characteristics -
Environmental
Endurance (Rated Power):
Humidity Load Life:
Temperature Cycling:
Operating Storage Temp:
Short Term Overload:
Vibration:
Bump:
Full Load, 1000h, 25°C
56 Days, 40°C, 95% RH
-55°C to +125°C, 5cycles
-55°C to +125°C
750W, 10s
10/500Hz
40g 4000 bumps
∆R
0.25% Typ
∆R
0.2% Typ (I.R.>10GΩ)
∆R
0.2% Typ
∆R
0.2% Typ
∆R
0.25% Typ
∆R
0.25% Typ
Characteristics -
Mechanical
Terminal Size:
Terminal Torque (max.):
Creepage Distance:
Clearance:
Heatsink Surface Finish:
Heatsink Flatness:
Thermal Grease:
Weight:
M4
1.3Nm
40mm
28mm
40mm
< 6µm
0.05mm
Required
190g
Key Features
I
400W in a 40.2cm
2
footprint
•
Gives an impressive
power density of
10W/cm
2
Virtually inductance-free
•
Inductance < 40nH
Wide resistance range:
0.47Ω to 1MΩ
•
Coupled with 1%
tolerance gives ultimate
design flexibility
Multiple terminal
configurations and
multi-resistor packages
•
The space saving
solution for demanding
creep and clearance
requirements
Partial discharge
<10pC at 7.5kV
•
Guaranteeing quality,
reliability and long life
Terminal to Heatsink
Terminal to Terminal
R
a
I
I
Dimensions
M4 (min 8mm)
67.0 ±0.25
34.0
4
36.0
MEC
14.8 max.
3
60.0 ±0.25
ø21.0
M4 (min 8mm)
67.0 ±0.25
34.0
ø21.0
2
60.0 ±0.25
14.8 max.
I
36.0
MEC
ø14.0
1
ø4.5 ±0.25
57.0 ±0.25
2
10.5 max.
30.0 max.
1
ø4.5 ±0.25
57.0 ±0.25
ø14.0
10.5 max.
30.0 max.
I
Applications
I
I
I
Snubbing (Low inductance)
Balancing Resistor
(Multi-resistor package)
Filter (Low inductance)
I
I
High Voltage
High Frequency
Literature No. 1773307
Issued: 02-06
Dimensions are shown for
reference purposes only.
Dimensions are in millimetres
unless otherwise specified.
Specifications subject to
change.
www.tycoelectronics.com
passives.tycoelectronics.com
Thick Film Power Resistors
Type BDS250/400 Series
Terminal Circuit Type
A (Standard)
1
2
D (Network Tapped)
1
4
B (Voltage Sense)
1
2
E (Network 3 Res.)
4
2
3
3
4
C (Isolated 2 Res.)
3
1
1
4
2
3
2
Derating Curve
450
400
350
300
Power (W)
250
200
150
100
50
0
0
20
40
60
80
100
120
Heatsink Temp. (degC)
140
160
Pulse Energy
100
Energy (J)
10
0.1
0.01
0.1
Time (msecs)
1
10
Power Overload
Multiples of Rated Power (250W)
8
7
6
5
4
3
2
1
0
1
10
Time (msecs)
*Temperature - Heatsink
100
1000
*90°C
*100°C
*80°C
*70°C
How to Order
BDS 2
Common Part
BDS 2 (2 Terminal)
BDS 4 (4 Terminal)
A
Circuit Type
A: Standard
B-E: See above
250/400
Power Dissipation
250 - 250 Watts
400 - 400 Watts
1K0
Resistance Value
0.47Ω
(470mΩ)
R47
1Ω
(1000mΩ)
1R0
1K
(1000Ω)
1KO
1M
(1000000Ω)
1MO
J
Tolerance
F - 1%
J - 5%
K - 10%
Literature No. 1773307
Issued: 02-06
Dimensions are shown for
reference purposes only.
Dimensions are in millimetres
unless otherwise specified.
Specifications subject to
change.
www.tycoelectronics.com
passives.tycoelectronics.com
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