1. Passive Component Applications
Resistor Solutions for Medical Applications 2006

2. TT electronics
Supplier of electronic and electrical components to the world’s leading companies

3. TT electronics (Components)
Resistive Components
Sensors
Hybrids
AB Sites Salzburg; Werne; Klingenburg
FE offices; Japan; Malaysia; Singapore
USA sites; Corpus Christi; Boone; Smithfield
Europe offices; UK, France, Germany, Italy
Magnetic Materials
Wound Components
Optoelectronics

4. Welwyn Components, UK
1937: Started Resistor Manufacture in Welwyn Garden City near London
1948: Moved to Northumberland, near Newcastle
1960: Started Hybrids Manufacture
1990: Acquired By TT Group
2001: TT became “TT electronics plc”

5. Welwyn Components, UK Applications Engineering Contacts
Custom & new products
Special testing
Pulse performance data
Applications support
Stephen Oxley
Direct: +44 (0)
Martin Birkett
Direct: +44 (0)

6. Passive Components Applications
Agenda
Welwyn Resistive Components for medical applications
High pulse applications
High voltage / high value applications
High precision applications

7. Defibrillator Pulse Protection High Gain Amplifier Feedback
Applications:
Medical
Carbon-Ceramic
Composition
CCR1
Defibrillator Pulse Protection
High Gain Amplifier Feedback
High Value
Chip HR
Defibrillators
Monitors
Charge
Voltage
Control
Welwyn
High Voltage
Chip
HVC
In-Vitro Diagnosis
Precision
Metal Film
RC / CAR / MAR
Scanners
X-Rays
Analysis
Imaging
70-100kV X-Ray Head
Ultra-High
Voltage
T48
4500

8. Monitor leadset proection
Pulse Applications
Defibrillator
Monitor leadset proection

9. Pulse Applications Two products are being offered, CCR1 and PWC2512
Low resistance (470R - 2K2) – CCR1
High resistance (68K K) – PWC2512

10. PWC Pulse Withstanding Chip
PWC Features
Choice of high stability materials (same as for military CECC parts)
Trimming method avoids hotspot and redundant film area
Commodity Chip

11. DSC Double Sided Pulse Chip
DSC Features
Further 100% increase in pulse capacity over PWC
Replacement for costly molded wirewound =
PWC
DSC

12. High Voltage
Defibrillator charge voltage control

13. Voltages 50 to 100kV, Resistances 200M to 1G.
High Voltage
X-ray power supply
Voltages 50 to 100kV, Resistances 200M to 1G.
X-Ray
200M
13K
-70kV
-4.7V

14. High Voltage

15. High Voltage

16. High Value
High gain amplification, e.g. ECG

17. High Value

18. Precision Through-Hole

19. Precision SMD

20. MELF format also available
Compact precision WRM
MELF format also available
0102 / 0204 / 0207 sizes
High stability metal film
Ideal for measurement circuits
TCR to 5ppm
Tolerance to 0.1%

21. Application Note

22. The End
Thank you!
Any questions?