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Resistors for Pulsed Power
R Series
Pulsed power applications present a unique set of thermal problems. Frequent cycling of power can cause materials to expand rapidly, sometimes with destructive effects.

By closely matching the Coefficient of Thermal Expansion (CTE) of adjoining materials, catastophic failures can be eliminated.
Also see:
Terminations for Pulsed Power
Attenuators for Pulsed Power
Below are some of Barry Industries' Standard Copper-Tungsten flanged resistors. Engineers are welcome to contact us and we will design a Copper-Tungsten flanged resistor to your exact specifications.

Customer defined testing is available on all Barry devices.
To minimize CTE mismatch and increase thermal conductivity, a Gold-Germanium eutectic is used to bond the BeO to the flange. To further minimize CTE mismatch, a Copper-Tungsten flange is used.

The Gold-Germanium layer is chemically compatible with the Gold plated ajoining layers, and no embittling metallics will form. The Gold matrix exhibits outstanding ductility, corrosion resistance, low diffusivity and low toxicity, as opposed to lead.

Specifications:

Resistive Element:

Substrate:

Mounting Flange

Leads:
Proprietary Thick Film

BeO

Copper-Tungsten

Gold Plated Copper (.005" thick)
Cycling Test Details
• Applied Power: 250W
• Cycle: 10 seconds On, 10 seconds Off

Cycling Test Results
• All Copper flanged resistors failed after 600 cycles
• All
Copper-Tungsten flanged resistors still operational after 500,000 cycles
CW Power
(Max)
(W)
Configuration
Ceramic
A
Length
B
Width
C
Hole to Hole or Hole to Edge
D
Lead Width
E
From Bottom Face of Lead
F (Max)
Height
G
Hole Diameter
RoHS
Data Sheet
30
BeO 0.515" 0.250" 0.125" 0.060" 0.105" 0.140" 0.130" Yes
50
BeO 0.515" 0.250" 0.125" 0.060" 0.105" 0.140" 0.130" Yes
80
BeO 0.515 0.250" 0.125" 0.060" 0.125" 0.160" 0.130" Yes
150
BeO 0.800" 0.230" 0.600"-
0.560"
0.040" 0.105" 0.140" 0.130" Yes
250
BeO 0.975" 0.375" 0.725" 0.120" 0.165" 0.200" 0.130" Yes
400
BeO 1.100" 0.500" 0.800" 0.250" 0.165" 0.200" 0.170" Yes
800
BeO 1.90" 0.500" 1.550" 0.250" 0.190" 0.250" 0.170"
(4X)
Yes
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One Hole High Power
Flange Resistor Configuration
Two Hole High Power
Flange Resistor Configuration
Four Hole High Power
Flange Resistor Configuration
For more information regarding the benefits of using Copper-Tungsten flanged resistors high thermal cycle environments click here