Ptc C945

Updated September 20, 2026

Overview

Product sourcing insights & recommendations

28 来源

The PTC C945 (specifically the B59945C0120A070 by TDK/EPCOS) is a high-performance leaded disk thermistor designed for overcurrent and short-circuit protection in 12V and 24V DC/AC circuits Mouser.

Technical Profile: PTC C945 (B59945)

The C945 belongs to the C935–C995 series, optimized for rugged industrial and automotive environments Mouser Tdk.

* Performance Metrics: Features a rated current of 1,300 mA and a switching current of 2,600 mA, with a maximum switching capacity of 8.0 A at 30V Mouser.

* Resistance: Rated at a low 0.45 Ω to minimize power loss during normal operation Mouser.

* Safety Standards: Fully qualified under AEC-Q200 for automotive use and UL approved (E69802) for industrial safety Digchip Mouser.

Market Trends & Insights (2025–2034)

The global PTC thermistor market is currently in a high-growth phase, fueled by the rapid adoption of electric mobility and smart infrastructure Getspotnews Accio.

* Valuation & Growth: The market, valued at US$ 555.1 million in 2025, is projected to reach US$ 946.3 million by 2034, growing at a CAGR of 6.1% Theinsightpartners Verifiedmarketresearch.

* Key Drivers:

* EV Battery Management: Critical demand for PTC devices in Battery Management Systems (BMS) and on-board chargers to prevent thermal excursions Getspotnews Indexbox.

* Industrial IoT: Expanding use in smart factory densely packed PCBs where self-resetting protection reduces maintenance downtime Getspotnews Peaksensors.

* Geographic Momentum: Asia-Pacific dominates global supply and consumption (projected 8% CAGR by 2026), driven by the electronics manufacturing hubs in China and South Korea Financialcontent Accio.

Sourcing Strategy

While the exact "C945" model is often stocked by specialized distributors (e.g., Mouser, DigiKey), B2B platforms like Alibaba.com offer custom manufacturing options from vetted suppliers like Focus Sensing And Control Technology or Nanjing Haichuan Electronic, both of which provide IATF 16949-certified overcurrent protection solutions Alibaba. The identified suppliers and alternative models are listed in the files below for your comparison.

Here is the detailed technical and market analysis for the C945 PTC. You can continue with:

Sources & References

28 sources cited · Verified industry data & reports

PTC thermistors for overcurrent protection

„Mouser Electronics“ Lietuva

Applications Overcurrent protection Short circuit protection Features Lead-free terminals. Low resistance For rated currents of up to 1.8 A UL. PTCs must not ...

PTC thermistors for overcurrent protection - Leaded disks, ...

TDK Electronics

Features. No intentional use of lead compounds. Lead concentration in the homogenous materials lower than 0.1%. Tight resistance tolerance.

C945 datasheet - PTC Thermistors for Overcurrent Protection

Digchip

Number of cycles: 100 Storage. Test duration: 1000 h Temperature of air: 40 °C air: 93% Duration: 56 days. Number of cycles: 5 Test duration: 30 min. Frequency ...

Temperature Sensors – PTC Thermistors

DigiKey TechForum

Temperature Coefficient (PTC) thermistor temperature sensors are devices that exhibit an increase in resistance in response to an increase in ...

What Are PTCs, and When Should You Use Them in Your ...

Poly Electronics

PTC stands for Positive Temperature Coefficient. In simple terms, this means the resistance of the component increases as it gets hotter.

PTC Thermistor: Positive Temperature Coefficient

Electronics Notes

This form of PTC thermistor is used in heaters, sensors and specialised versions are also used as resettable fuses. PTC thermistors are used in many electronic ...