The MAX1668/MAX1805/MAX1989 are precise multichannel digital thermometers that report the temperature of all remote sensors and their own packages. The remote sensors are diode-connected transistors—typically low-cost, easily mounted 2N3904 NPN types—that replace conventional thermistors or thermocouples. Remote accuracy is ±3°C for multiple transistor manufacturers, with no calibration needed. The remote channels can also measure the die temperature of other ICs, such as microprocessors, that contain an on-chip, diode-connected transistor.The 2-wire serial interface accepts standard system management bus (SMBus™) write byte, read byte, send byte, and receive byte commands to program the alarm thresholds and to read temperature data. The data format is 7 bits plus sign, with each bit corresponding to 1°C, in two's-complement format.The MAX1668/MAX1805/MAX1989 are available in small, 16-pin QSOP surface-mount packages. The MAX1989 is also available in a 16-pin TSSOP.ApplicationsCentral Office Telecom EquipmentDesktop/Notebook ComputersIndustrial ControlsLAN ServersMultichip ModulesTest and Measurement Equipment

The MAX6654 is a precise digital thermometer that reports the temperature of both a remote P-N junction and its own die. The remote junction can be a diode-connected transistor—typically a low-cost, easily mounted 2N3904 NPN type or 2N3906 PNP type—that replaces conventional thermistors or thermocouples. Remote accuracy is ±1°C for multiple transistor manufacturers, with no calibration needed. The remote junction can also be a common-collector PNP, such as a substrate PNP of a microprocessor (µP).The 2-wire serial interface accepts standard System Management Bus (SMBus), Write Byte, Read Byte, Send Byte, and Receive Byte commands to program the alarm thresholds and to read temperature data. Measurements can be done automatically and autonomously, with the conversion rate programmed by the user, or programmed to operate in a single-shot mode. The adjustable conversion rate allows the user to optimize supply current and temperature update rate to match system needs. When the conversion rate is faster than 1Hz, the conversion results are available as a 7-bit-plus-sign byte with a 1°C LSB. When the conversion rate is 1Hz or slower, the MAX6654 enters the extended mode. In this mode, 3 additional bits of temperature data are available in the extended resolution register, providing 10-bit-plus-sign resolution with a 0.125°C LSB. Singleshot conversions also have 0.125°C per LSB resolution when the conversion rate is 1Hz or slower.A parasitic resistance cancellation (PRC) mode can also be invoked for conversion rates of 1Hz or slower by setting bit 4 of the configuration register to 1. In PRC mode, the effect of series resistance on the leads of the external diode is canceled. The 11-bit conversion in PRC mode is performed in The MAX6654 default low-temperature measurement limit is 0°C. This can be extended to -64°C by setting bit 5 of the configuration register to 1.The MAX6654 is available in a small, 16-pin QSOP surface-mount package.ApplicationsComputers: Desktop, Workstation, ServerMultichip ModulesNotebook ComputersServersTest and Measurement EquipmentThin ClientsWorkstations

Thermostat Sw, 1A, 120Vac/48Vdc, 60Deg Rohs Compliant: Yes |Sensata/airpax 66L060

Thermostat Sw, 0.5A, 48Vdc, 45Deg Rohs Compliant: Yes |Sensata/airpax 67L045

Thermostats Programmable Digital Thermostat/Thrmmtr

P3T2030DUK

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LM335 Military grade, +2C analog output temperature sensor with 10mV / K gain

Isolated High Accuracy Digital Temperature Measurement System with EEPROM Features:5000VRMS Isolated Power and SPI InterfaceDirectly Digitizes 2-, 3- or 4-Wire RTDs, Thermocouples, Thermistors and Diodes10 Flexible Inputs Allow Interchanging SensorsAutomatic Thermocouple Cold Junction CompensationBuilt-In Standard and User-Programmable Coefficients for Thermocouples, RTDs and ThermistorsAutomatic Burn Out, Short-Circuit and Fault DetectionBuffered Inputs Allow External ProtectionSimultaneous 50Hz/60Hz RejectionIncludes 15ppm/°C (Max) ReferenceIncludes Special Protection ModesOn-Chip EEPROM Stores Channel Configuration Data and Custom Coefficients

Multi-Sensor High Accuracy Digital Temperature Measurement System with EEPROM Features:Directly Digitizes 2-, 3-, or 4-Wire RTDs, Thermocouples, Thermistors, and DiodesOn-Chip EEPROM (LTC2986-1) Stores Channel Configuration Data and Custom CoefficientsSingle 2.85V to 5.25V Supply10 Flexible Inputs Allow Interchanging SensorsAutomatic Thermocouple Cold Junction CompensationBuilt-In Standard and User-Programmable Coefficients for Thermocouples, RTDs and ThermistorsMeasures Negative Thermocouple VoltagesAutomatic Burn Out, Short-Circuit and Fault DetectionBuffered Inputs Allow External ProtectionSimultaneous 50Hz/60Hz RejectionIncludes 15ppm/°C (Max) ReferenceIncludes Special Protection Modes