Technical Specification Sheet for 0ZCH0010FF2E Surface Mount PTC

1. Basic Product Information

2. Electrical Characteristics (At 23°C, Still Air)

3. Physical & Packaging Specifications

3.1 Mechanical Dimensions

3.2 Recommended Pad Layout (Matte Tin-Plated Copper)

3.3 Packaging Details

4. Operating Principle & Tripped State Behavior

4.1 Basic Working Mechanism

The 0ZCH0010FF2E consists of a polymeric matrix embedded with conductive carbon granules, sandwiched between two metal plates. Under normal conditions (current ≤ $$I_$$, temperature ≤ 100°C), the carbon granules form continuous conductive paths, maintaining low resistance ($$< R_{1max$$).

When an overcurrent or overtemperature event occurs:

1. Current exceeds $$I_$$ (or external heat raises temperature to ~125°C), causing the polymer to expand volumetrically.
2. Expansion breaks the carbon conductive chains, leading to a sharp resistance increase (tripped state).
3. The tripped state limits current to a residual level, keeping the polymer at 125°C.
4. When power is removed, the polymer cools and shrinks, re-establishing carbon chains—device resets to low-resistance state (≤ $$R_{1max$$) once cooled to room temperature.

4.2 Tripped Resistance Calculation

Tripped resistance is not constant; it depends on applied voltage and ambient conditions. Using the typical power dissipation ($$P_d = 0.6$$ W), calculate via:$$R_{tripped} = \frac{E^2}{P_d$$

• Example 1: 60V supply → $$R_{tripped} = \frac{60^2}{0.60} = 6,00$$ Ohms
• Example 2: 12V supply → $$R_{tripped} = \frac{12^2}{0.60} = 24$$ Ohms

5. Temperature Derating Characteristics

5.1 Temperature Derating Table (Percent of Rated $$I_$$ and $$I_$$)

5.2 Key Note

At temperatures above 23°C, the effective hold current ($$I_$$) and trip current ($$I_$$) decrease. For example, at 85°C, the effective $$I_$$ is 0.10 A × 48% = 0.048 A—ensure application load current is below this value to avoid false tripping.

6. Environmental & Mechanical Specifications

6.1 Environmental Test Standards

6.2 Cautionary Notes for Environmental Use

1. Avoid contact with chemical solvents—prolonged exposure degrades PTC performance.
2. Do not use in circuits with large inductance; PTC tripping may generate voltage spikes exceeding $$V_{max$$.
3. Suitable for both DC and AC circuits, but peak-to-peak AC voltage must not exceed $$V_{max$$ (60V).
4. If potting is required, use non-rigid compounds—rigid potting blocks polymer expansion and prevents tripping.

7. Solder Reflow & Rework Recommendations (Pb-Free Assembly)

7.1 Reflow Profile Parameters

7.2 Rework & Assembly Notes

1. Recommended Ref