The TK12 at an angle: a black board with a gold-plated border, a tiny surface-mount thermistor inside a boxed outline near the top beside a thermometer icon, a resistor and a capacitor below it, ANALOG printed on the edge, two big mounting holes, and a right-angle four-pin header labelled GND, VCC, NC and SIGNAL.

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NTC Thermistor

A 10 kΩ NTC thermistor in a divider with a fixed 10 kΩ: SIGNAL is half of VCC at 25 °C and falls as it warms. Read it on any analog pin and turn it into degrees with two lines of arithmetic.

At 25 °C: 10kΩ, ±1 %
B: 3950K
VCC: 3.3or 5 V, to match your board
Wires: 3GND, VCC, SIGNAL

Start here · 01 The four pins Open the board in 3D

Turn it over and see the three holes to wire: GND, VCC and SIGNAL. SIGNAL is half of VCC at 25 °C and falls as it warms, so match VCC to your board.

Product questions & answers ↓

The whole handbook12 articles · 55 min Quick referencePDF · 443 KB NTC Thermistor model (GLB)GLB · 767 KB NTC Thermistor CAD (STEP)ZIP · 679 KB NTC Thermistor drawing (PDF)PDF · 2.2 MB NTC Thermistor drawing (DXF)ZIP · 27 KB Pinout and specsThe pin table, and the questions people ask first

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NTC Thermistor

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Need another

Not on general sale yet. Reply to your order and we will sort out a spare — quote tk12.

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Email us or reply to your order, and quote tk12 — that identifies the product. If something is missing from the bag, your order is the record of what shipped.

Take it with you

Point a phone camera at the code and this page opens there. It is the same address as the one printed on your box, so it is also what to show someone you are passing the board to.