| Rated Zero-Power Resistance RN () | RN 20% | Ambient temp. Range: 25C2C (TA). Testing voltage: 1.5VDC. After
placing for 1~2 hours under TA, the resistance value shall be
measured. |
| Thermal Dissipation Constant (mW/C) | See the main technical parameter list | The thermal dissipation constant() could be calculated by the ratio
of a change in power dissipation (P) of the thermistor to a change
in temperature (T) of the thermistor at a specified ambient
temperature. |
| Thermal Time Constant T (s) | See the main technical parameter list | The time (t) shall be measured within which the temperature is
reached at 63.2% of the ambient temperature change under zero power
condition. |
| Material Constant B | B=T1T2/(T2-T1) x Ln(R1/R2) | R1, R2 is zero-power resistance at T1, T2. T1=298.15 K (25C), T2 =
323.15 K (50C) |
| Max. Steady State Current (A) | - | Ambient temperature: 25C2C. Testing Time: min 100h. |
| Solder-ability | The terminals shall be uniformly tinned, and its area 95% | Dipping the NTC terminals to a depth of 15mm in a soldering bath of
240-245C and to the place of 6mm far from NTC body for 2-3s (See
IEC68-2-20 /GB2423.28 Ta). |
| Resistance To Soldering Heat | No visible mechanical damage. R/RN 20% (R = |RN-RN'|) | Dipping the NTC terminals to a depth of 15mm in a soldering bath of
2655C and to the place for 6mm below from NTC body for 101s. After
recovering 4-5h under 252C, the rated zero power resistance value
RN' shall be measured. (See IEC68-2-20 /GB2423.28 Tb). |
| Strength of lead terminal | No break out. R/RN 20% (R = |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 252C, the rated zero power
resistance value RN' shall be measured. (See IEC68-2-21/GB2423.29
Ua / Ub). |
| Temp. Cycling Testing | No visible mechanical damage. R/RN 20% (R = |RN-RN'|) | Ta:-40+3C/ 30min252C/ 5minTb:200+3C/30min252C/ 5min. Cycles: 5
times. After recovering 4~5 h under 252C, the rated zero power
resistance value RN' shall be measured. |
| Electrical Cycling Testing | No visible mechanical damage. R/RN 20% (R = |RN-RN'|) | Ambient temp. Range: 25C2C. Cycles: 1,000 times. On / Off: 1m / 5m.
Test Current: Max. steady state Current. After recovering 4~5h
under 252C, the rated zero power resistance value RN shall be
measured. |
| Load Life (Endurance) Testing | No visible mechanical damage. R/RN 20% (R = |RN-RN'|) | Ambient temp. Range: 25C2C; Max. steady state Current/ 1,00024 h.
After recovering 4~5 h under 252C, the rated zero power resistance
value RN' shall be measured. |
| Humidity Testing | No visible mechanical damage. R/RN 20% (R = |RN-RN'|) | Ambient temp. range : 40C2C, R.H.: 933%, Energized time: 100024 h.
After recovering 4~5 h under 252C, the rated zero power resistance
value RN' shall be measured. |
