Electrical resistors – Resistance value responsive to a condition – Current and/or voltage
Patent
1997-06-10
1999-04-20
Walberg, Teresa
Electrical resistors
Resistance value responsive to a condition
Current and/or voltage
H01C 710
Patent
active
058960813
ABSTRACT:
The present invention discloses a surface-mount resistance-temperature-detector (RTD) supported on a substrate. The surface-mount RTD includes a resistive strip disposed on a top surface of the substrate having a substantially linear temperature resistance coefficient (TCR) over a predetermined temperature range for measurement. The surface-mount RTD further includes two top terminals disposed on two opposite end on the top surface of the substrate wherein each of the top terminal connected to one end of the resistive strip. The surface-mount RTD further includes two bottom terminals disposed on a bottom surface of the substrate wherein each of the bottom terminals is disposed below one of the top terminals. The surface-mount RTD further includes two edge conductive plates each disposed on an edge surface of the substrate connected to one of the top terminals to a corresponding bottom terminal below. The surface-mount RTD further includes two surface mount solder electrodes wherein each solder electrode constituting a conductive layer overlying the top terminal, the edge conductive plate and the bottom terminal provided for performing a surface-mount soldering operation thereon. In a preferred embodiment, the surface-mount RTD further includes a passivation protective layer covering and protecting the resistive strip. In a preferred embodiment, the surface-mount RTD further includes two terminal-solder buffer pastes each disposed on top of the top surface terminal under the surface-mount solder electrode for buffering the top terminal and the solder electrode. In a preferred embodiment, the resistive strip is a platinum resistive strip having a temperature coefficient of resistance (TCR) ranging from 3000 to 3900 ppm/.degree.C.
REFERENCES:
patent: 4805296 (1989-02-01), Jinda et al.
patent: 5493266 (1996-02-01), Sasaki et al.
Cheng Duen-Jen
Hsieh Roger
Tzeng Jackel
Cyntec Company
Lin Bo-In
Pwu Jeffrey
Walberg Teresa
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