Surge Current Limiting MF72 Power NTC Thermistor Resistor Disc NTC 10D-7 10D7 Thermal Resistor Posistor Suppression
Description
This product effectively supresses surge currents that are generated when switching power regulators
are turned on.
NTC thermistor has to be connected in series to the power source circuit to avoid the surge current at the instant when the electronic circuits are turned on. The device can effectively suppress the surge current, and its resistance and power consumption can be greatly reduced after that through the continuous effect of the current so as not to affect the normal work current. Therefore the Power NTC thermistor is the most convenient and efficient instrument to curb the surge current and protect the electronic devices from being damaged.
Features
1. Lead is not contained in the ceramic element, the terminations, the solder for inner connection and the coating resin.
2. Most suitable for power supplies of less than 100W 3. Excellent recovery characteristics due to resin coating with excellent heat characteristics
4. Highly reliable
Applications
1. Switching power supplies
2. CRT monitors
3. Color televisions
4. VCR power supplies
5. Other power circuits
Main parameters and dimension
| P/N |
Rated Resistance |
(A) | D | L | F |
Dimensions (Unit:mm) |
|
|
Max. Steady State Current |
Dmax | Lmin | F±1 | Tmax | d | ||
| 5D-5 | 5 | 1 | 6.5 | 25 | 5.0/2.5 | 5 | 0.55/0.45 |
| 10D-5 | 10 | 0.7 | 6.5 | 25 | 5.0/2.5 | 5 | 0.55/0.45 |
| 20D-5 | 20 | 0.5 | 6.5 | 25 | 5.0/2.5 | 5 | 0.55/0.45 |
| 5D-7 | 5 | 2 | 8.5 | 25 | 5 | 5 | 0.55 |
| 8D-7 | 8 | 1 | 8.5 | 25 | 5 | 5 | 0.55 |
| 10D-7 | 10 | 1 | 8.5 | 25 | 5 | 5 | 0.55 |
| 12D-7 | 12 | 1 | 8.5 | 25 | 5 | 5 | 0.55 |
| 16D-7 | 16 | 0.7 | 8.5 | 25 | 5 | 5 | 0.55 |
| 20D-7 | 20 | 0.6 | 8.5 | 25 | 5 | 5 | 0.55 |
| 22D-7 | 22 | 0.6 | 8.5 | 25 | 5 | 5 | 0.55 |
| 33D-7 | 33 | 0.5 | 8.5 | 25 | 5 | 5 | 0.55 |
Application Circuit
Determination of Allowable Current
ROBUSTNESS OF TERMINATIONS
The leads meet the requirements of IEC 60068-2-21.
| Test | Test conditions | Remarks |
| Tensile strength | Test Ua1: Fasten body with a force applied to each lead 10 [N] for 10 [s] |
No visible damage |
| Bending strength | Test Ub: Fasten body with two 90°-bends in opposite direction at a force of 10 [N] |
No visible damage (Peel off of coating along the lead accepted) |
Mechanical Requirements
| Item | Requirements | Test Method |
| 1.Solder-ability | The terminals shall be uniformly tinned, and its area≥95% | Dipping theNTC terminals to a depth of 15mm in a soldering bath of 245±5℃ and to the place of 6mm far from NTC body for 3±0.5s (See IEC68-2-20 /GB2423.28 Ta ) |
| 2.Resistance To Soldering Heat |
No visible mechanical damage. ΔR/RN ≤20% (ΔR =∣RN-RN'∣) |
Dipping the NTC terminals to a depth of 15mm in a soldering bath of 260±5℃ and to the place for 6mm below from NTC body for 3±0.5s.After recovering4-5h under 25±2℃. The rated zero power resistance value RN' shall be measured. (See IEC68-2-20 /GB2423.28 Tb) |
| 3.Strength of lead terminal |
No break out ΔR/RN ≤20% (ΔR =∣RN-RN'∣) |
Fasten the body and apply a force gradually to each lead until 10N and then keep for 10sec, Hold body and apply a force to each lead until 90°slowly at 5N in the direction of lead axis and then keep for 10sec, and do this in the opposite direction repeat for other terminal. After recovering 4~5h under 25±2℃, the rated zero power resistance value RN' shall be measured. (See IEC68-2-21/GB2423.29 Ua / Ub) |
Reliability Test
| Item | Requirements | Test Method |
| 1.Temp. Cycling Testing |
No visible mechanical damage. ΔRN / RN ≤20% (ΔR =∣RN-RN'∣) |
Ta:-40±3℃/ 30min→25±2℃/ 5min→ Tb:160±3℃/ 30min→25±2℃/ 5min Cycles: 5times After recovering 4~5 h under 25±2℃, the rated zero power resistance value RN' shall be measured. |
| 2.Electrical Cycling Testing |
Ambient temp. Range:25℃±2℃. Cycles: 2,000times On / Off: 5 s / 55 s Test Current: 7A After recovering 4~5h under 25±2℃, the rated zero power resistance value RN' shall be measured. |
|
| 3.LoadLife ( Endurance ) Testing |
Ambient temp. Range:25℃±2℃; 7A/ 1,000±24h After recovering 4~5 h under 25±2℃, the rated zero power resistance value RN' shall be measured. |
|
| 4. Humidity Testing |
No visible mechanical damage. ΔRN / RN ≤20% (ΔR =∣RN-RN'∣) |
Ambient temp. range : 40℃±2℃ R.H.:93±3% , Energized time:1000±24 h After recovering 4~5 h under 25±2℃, the rated zero power resistance value RN' shall be measured. |
