值 得 信 赖 的 电 子 电 路
Negative Temperature Coefficient 负温度系数热敏电阻
Model No：MF72 功率型热敏电阻系列
过 电 流 过 电 压 保 护 专 家
power resistance value RN' shall be measured. (See IEC68-2-20
/GB2423.28 Tb)
根据IEC68-2-21（GB2423 .29）试验U 进行试验。
试验 Ua：拉力10N，持续10 S；
试验 Ub：弯曲90°，拉力5N，持续10 S；
扭转 180°，拉力5N，持续10 S。
在 25±2℃条件下恢复4～5 h 后，复测额定零功率电阻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.
无损坏
引出端强度
Strength of lead
terminal
No break out
ΔR/RN ≤20%
(ΔR =∣RN-RN'∣)
(See IEC68-2-21/GB2423.29 Ua / Ub)
电气性能ELECTRICAL CHARACTERISTICS
指标项目Item
技术要求Specification
测试条件/方法Test Conditions & Methods
环境温度 TA: 25℃±1℃
测试电压: 1.5VDC
额定零功率电阻
Rated Zero-Power
Resistance
在恒温TA 条件下，放置1~2 小时后测得阻值RN。
Ambient temp. Range:25℃±1℃(TA).
20±20%
Testing voltage: 1.5VDC
RN (Ω)
After placing for 1~2 hours under TA, the resistance value
shall be measured
在特定的环境温度下，热耗散系数(δ)为热敏电阻电功率消耗(ΔP)
与本体温度变化量 (ΔT)的比值.
热耗散系数δ(mW/℃)
Thermal Dissipation
Constant
The thermal dissipation constant(δ) could be calculated by
the ratio of a change in power dissipation(ΔP) of the
thermistor to a change in temperature(ΔT) of the thermistor
at a specified ambient temperature
≥6
热时间常数(τ)为在零功率条件下，热敏电阻的温度下降到其
最初温度与最终温度之差为63.2% 时所需要的时间
The time(τ shall be measured within which the temperature
change of NTC thermistor is reached at 63.2% of the ambient
temperature change under zero power condition
R1 , R2 分别为 T1 , T2 温度下的零功率电阻
R1 , R2 is zero-power resistance at T1 , T2
T1 = 298.15 K(25℃) T2 = 323.15 K(50℃)
热时间常数τ(s)
≤20
Thermal Time Constant
2800±10%
B=T1T2/( T2- T1) ×
Ln
材料常数
Material Constant B
(R1/R2)
无可见损伤
环境温度:25℃±2℃Ambient temp. Range.
测试电流0.5A Testing Current
最大稳态电流(A)
Max.Steady State
Current
visible mechanical
damage.
ΔRN / RN ≤20%
(ΔR =∣RN-RN'∣)
可靠性试验（周期性检测项目）Reliability Test
NOTE: ALL DATA AND SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
ALL PRODUCTS COMPATIBLE WITH ROHS
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