Dallas, Tex. Texas Instruments Inc. (TI) said it has introduced the industry's smallest remote junction temperature sensors with a built-in local temperature sensor. Housed in a 8-lead SOT23 package, the single remote channel TMP421 and dual remote channel TMP422 deliver remote sensor accuracy of ±1°C (maximum) and a local temperature sensor range of ±1.5°C (maximum).
The TMP421 and TMP422 sensors operate on a standard I2C/SMBus compatible, two-wire interface over a temperature range of -40°C to 125°C, with a remote temperature range of up to 150°C. For maximum power savings, the device circuitry (other than the serial interface) can be shut down, reducing current consumption to typically less than 3 uA.
The sensors also feature multiple addresses. The remote temperature sensor diode-connected transistors are typically low-cost NPN- or PNP-type transistors or diodes that are an integral part of microprocessors, microcontrollers and FPGAs. The TMP421 and TMP422 also include series resistance cancellation, programmable non-ideality factor and diode fault detection.
Both sensors are RoHS compliant and can be used in many applications including LCD/DLP/LCOS projectors, servers, central office telecom equipment and laptop computers. They are also suitable for industrial controllers, processor/FPGA temperature monitoring and storage area networks.
Pricing: The TMP421 is priced at $1.25 each and the TMP422 is priced at $1.65 each, both in quantities of 1,000 (suggested resale pricing).
Availability: The TMP421 and TMP422 are available now from TI and its authorized distributors.
Product information: TMP421, TMP422 and analog design support and selection guide
Texas Instruments, 1-800-477-8924, www.ti.com