What the DS1780E+T&R does on a server or industrial board
The DS1780E+T&R from Analog Devices is a CPU peripheral monitor that combines an internal temperature sensor, a sigma-delta ADC, a comparator, and fan speed control logic in a single 24-TSSOP package. It reads the local die temperature across a -40°C to 125°C range and reports it over an I²C/SMBus interface, while the integrated fan control loop can drive a cooling fan directly based on the temperature reading. The ±12% accuracy is typical for a general-purpose system monitor — adequate for server chassis, telecom line cards, and industrial controller boards where the goal is to trigger a fan ramp or an over-temperature warning, not to log precise thermal data.
Supply range and temperature grade — where it fits
The 2.8 V to 5.75 V supply range means the DS1780E+T&R can run from a standard 3.3 V or 5 V rail without an extra regulator. The -40°C to 125°C operating temperature covers the full industrial range and the lower end of automotive under-hood environments, so it is a natural fit for outdoor telecom cabinets, motor-drive enclosures, and power-supply base stations where the ambient can swing from a cold start to a hot plenum.
Lifecycle and sourcing
The DS1780E+T&R is listed as Active with ROHS3 compliance. For a BOM line that needs a thermal monitor with integrated fan control, this part carries no LTB risk and can be specified into new designs with confidence.