GaAlAs Diodes*
3Pages

GaAIAs Diodes GaAIAs Diodes ■ Monotonic temperature response from ■ Excellent sensitivity (dV/dT) at ■ Relatively low magnetic field-induced ■ Rugged, reliable Lake Shore SD package designed to withstand repeated thermal cycling and minimize sensor self-heating ■ Variety of packaging options ■ Small mass for rapid thermal response * Patent # 4,643,589, Feb 87, "Thermometry Employing Gallium Aluminum Arsenide Diode Sensor" Lake Shore (GaAIAs) diode temperature sensors are particularly well suited for low to moderate magnetic field applications at low temperatures. The GaAIAs sensing element exhibits high sensitivity (dV/dT) characteristics are monotonic over the sensor's useful range from 1.4 K to 500 K (see data plots below). direct band-gap, single junction devices that produce small output variances in the presence of magnetic fields. Consequently, their low magnetic field dependence makes them ideally suited for applications in moderate magnetic fields up to five tesla. Packaging options The Lake Shore SD package — the most rugged, versatile The SD package, with direct sensor-to-sapphire base mounting, hermetic seal, and brazed Kovar leads, provides the industry's most rugged, versatile sensors with the best sample to chip connection. Designed so heat coming down the leads bypasses the chip, it can survive several thousand hours at 500 K (depending on model) and is compatible with most ultra high vacuum applications. It can be indium soldered to samples without shift in sensor calibration. If desired, the SD package is also available without Kovar leads. Typical GaAIAs diode sensitivity Typical GaAIAs diode voltage Lake Shore Cryotronics, Inc. I t. 614.891.2244 I f. 614.818.1600 I e.info@lakeshore.com I

GaAIAs Diodes Standard curve Not applicable Maximum reverse voltage (diode) 2 V Maximum forward current (diode) 500 mA Dissipation at recommended excitation Typical 50 pW Thermal response time (typical) P and PL: 100 ms at Use in radiation Recommended for use only in low level Use in magnetic field Low magnetic field dependence when used in fields up to 5 tesla above 60 K— Soldering standard J-STD-001 Class 2 1 Short-term reproducibility data is obtained by subjecting sensor to repeated thermal shocks from 305 Kto 4.2 K Physical specifications Temperature response data table (typical) To...

GaAlAs Diodes Packaging options Ordering information For more information on sensor packages and mounting adapters, see page 21. Uncalibrated sensor Specify the model number in the left column only, for example TG-120-P. CO adapter — spring loaded clamp for easy sensor interchangeability Calibrated sensor Add calibration range suffix code to the end of the model number, for example TG-120-P-1.4L. GaAlAs diode Part number TG-120-P TG-120-PL* TG-120-SD TG-120-CO TG-120-CU TG-120-CU-HT Calibration range suffix codes Numeric figure is the low end of the calibration Letters represent the high...