# PTC Thermistor

**URL:** <https://forum.digikey.com/t/ptc-thermistor/51160>\
**Category:** Sensors Transducers\
**Tags:** temperature-sensors, part-identification\
**Created:** [February 14, 2025, 1:36pm UTC](https://forum.digikey.com/t/ptc-thermistor/51160 "2025-02-14T13:36:12Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![mieriks1](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/mieriks1/32/54878_2.png) [@mieriks1](https://forum.digikey.com/u/mieriks1)\
**Post date:** [February 14, 2025, 1:36pm UTC](https://forum.digikey.com/t/ptc-thermistor/51160/1 "2025-02-14T13:36:12Z")

</div>

Hello!

I’ve been looking for a PTC Thermistor on DigiKey that can protect different DUTs, like batteries and external chargers, and is connected to a programmable electric load, but I haven’t found any products that meet my requirements. I request the following:

- Has two wires that are 20-100cm long for practical use in laboratories
- Can easily assemble and disassemble (for example, thermal tape)
- T\_sense: The temperature sense should be at 80-90 degrees Celsius
- Should be able to operate at up to 150 degrees Celsius. 125 is okay as well, I think

Does anyone know of any thermistors that meet these requirements? Thanks in advance!

Regards,  
**mieriks1**

---

<div class="post-metadata">

**Author:** ![Craig\_2048](https://avatars.discourse-cdn.com/v4/letter/c/6a8cbe/32.png) [@Craig\_2048](https://forum.digikey.com/u/Craig_2048)\
**Post date:** [February 14, 2025, 2:04pm UTC](https://forum.digikey.com/t/ptc-thermistor/51160/2 "2025-02-14T14:04:10Z")

</div>

mieriks1

Thank you for contacting DigiKey , sorry I am not seeing that we have any PTC thermistors to offer for those specs .

Thanks Craig

---

<div class="post-metadata">

**Author:** ![rick\_1976](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/rick_1976/32/1571_2.png) [@rick\_1976](https://forum.digikey.com/u/rick_1976)\
**Post date:** [February 14, 2025, 4:43pm UTC](https://forum.digikey.com/t/ptc-thermistor/51160/3 "2025-02-14T16:43:53Z")

</div>

PTC _thermistors_ come in a couple of distinct flavors; a linear variety used for sensing purposes and a non-linear variety used for temperature/current limiting. The [PTC thermistor](https://www.digikey.com/en/products/filter/temperature-sensors/ptc-thermistors/550?s=N4IgjCBcoGwJxVAYygMwIYBsDOBTANCAPZQDaIALGGABxwDsIhAzDQKwAM9HTIzFcAExwILNmzhwKvZsw4wYovsMFtpLFXN4QAuoQAOAFyggAyoYBOASwB2AcxABfQmDh1EIFJAw4CxMiA8Oo4hQA) product family would be a likely place to look, however.

There are also PTC _fuse_ products, which serve similar though different purposes.

Defining the specific application, its requirements, and desired electrical behavior of the component in question would be important to identifying a suitable product.

> [@Thermistors](https://forum.digikey.com/t/thermistors/15536):
>
> Thermistors are an electronic component family very similar to resistors (the term is a portmanteau of THERMal and resISTOR) but which are intentionally designed to exhibit a strong dependence of resistance value on temperature. Two general types are available, PTC and NTC (Positive and Negative Temperature Coefficient) which exhibit a positive and negative change in resistance with an increase in temperature respectively. While commonly used as temperature sensors, thermistors can also be fou…