Kty21 5

Updated October 6, 2026

Overview

Product sourcing insights & recommendations

26 来源

The KTY21-5 is a silicon PTC (Positive Temperature Coefficient) temperature sensor known for its stable resistance-temperature characteristic and high accuracy. Originally manufactured by NXP (formerly Philips), the KTY series was discontinued around 2014-2015, leading to a market shift toward replacements like the KTY81 series or more modern standards like PT1000 Scribd Yumpu.

Key Specifications & Applications

* Technical Profile: It features a nominal resistance of 2000 Ω at 25°C with a tolerance of ±3% (the KTY21-6 variant offers a tighter ±1% tolerance). It operates across a range of -50°C to +150°C Scribd Yumpu.

* Primary Uses: Common in industrial controllers (e.g., JUMO DICON 401/501) for profile generators, HVAC/refrigeration displays, and motor overheating protection due to its rapid response to temperature changes Scribd Scribd.

* Integration: Primarily uses a 2-wire connection, requiring manual lead resistance compensation in software for precise measurements Scribd Scribd.

Market Trends & Availability

* Discontinuation & Surplus: While new production has ceased, "New Old Stock" (NOS) is occasionally available through industrial surplus suppliers or online marketplaces like AliExpress and eBay.

* Sourcing Replacements: The KTY81-220 is the closest functional equivalent, though physical packaging (TO-92 vs. SOT) should be verified. Most modern designs now utilize PT1000 RTDs as a more reliable and standardized alternative.

* B2B Outlook: Current sourcing typically focuses on Customizable KTY PTC Thermistors that mimic the original specifications for legacy system maintenance. I have identified several suppliers offering these compatible thermistor probes.

For more details on specific products and current suppliers, please refer to the search results file below.

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Sources & References

26 sources cited · Verified industry data & reports

JUMO DICON 401/501 Data Sheet

Scribd

The JUMO DICON 401/501 series are universal profile controllers/generators available in two formats, featuring customizable displays, multiple programming ...

416F38422IST Datenblatt | Heisener.com

Heisener Electronics

416F38422IST Spezifikationen ; Hersteller, CTS-Frequency Controls ; Rubrik, Kristalle, Oszillatoren, Resonatoren - Kristalle ; Paket, 4-SMD, No Lead ; ECAD ; Serie ...

Top Furniture Repair & Services in Fatehpur Tanda

Justdial

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NLB eResources

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Kty21 5

Overview

Key Specifications & Applications

Market Trends & Availability

Kty21 5 Temperature Sensor Thermistor

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Sources & References