Skip to main content
Log in
MCP9805T-BE-ST

Microchip MCP9805T-BE/ST Temp Sensor, ±3°C Accuracy, 8-TSSOP

MPNMCP9805T-BE/ST
End of Life

Microchip MCP9805T-BE/ST temperature monitoring system, ±3°C accuracy, I²C/SMBus, 3.0-3.6V supply, -40 to 125°C range, 8-TSSOP package.

$1.06Ref. price · indicative, final on quote
Microchip Technology MCP9805T-BE/ST datasheet (PDF)
Packaging8-TSSOP (0.173", 4.40mm Width)
RoHSRoHS non-compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

MCP9805T-BE/ST specifications
ParameterValue
Output typeI²C/SMBus
Sensor typeInternal
MountingSurface Mount
Voltage3V ~ 3.6V
Operating temperature-40°C ~ 125°C
PackageTape & Reel (TR); Cut Tape (CT)
Accuracy±3°C(Max)
FunctionTemp Monitoring System (Sensor)
TopologyADC (Sigma Delta), Register Bank
Output fanYes
Output alarmNo
Case8-TSSOP (0.173\", 4.40mm Width)
Sensing temperature-40°C ~ 125°C

Product details

The Microchip MCP9805T-BE/ST is a temperature monitoring system with an internal sensor, a sigma-delta ADC, and a register bank, all in an 8-TSSOP package. For a fan-control loop or overtemperature shutdown, that's adequate headroom; for a precision thermistor replacement in a medical or metrology path, you'll want a tighter-grade part.

The I²C/SMBus interface uses 3.3 V logic levels.

8-TSSOP — reworkable with care

The 8-TSSOP package has a 4.40 mm body width. The pad footprint follows the standard TSSOP-8 land pattern.

Frequently asked questions

What is the accuracy of MCP9805T-BE/ST?

The maximum accuracy is ±3°C over the full -40°C to 125°C sensing range. This is a worst-case spec — typical accuracy at 25°C is better, but the datasheet's min/max table is the binding limit for your system error budget.

Can MCP9805T-BE/ST be used in 5V systems?

No — the supply voltage is limited to 3.6 V maximum. In a 5 V system you would need a 3.3 V regulator to power the sensor. The I²C/SMBus interface is 3.3 V logic, so it will not tolerate 5 V on the bus lines without a level shifter.