NTC Thermistors MF72 Series 20D-20 20Ω 4A overcurrent protection device in Disk-Type from China manufacturer

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NTC Thermistors MF72 Series 20D-20

20Ω 4A overcurrent protection device in Disk-Type

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Product profile

Parameter table

Application

Document

Description

Features

Lead shape and product size

I Type

O Type

Y Type

S Type

Note: if the particular shape, commonly used for bending type, namely the inner-bended fomming for long lead.

Electrical Characteristics

Item	Specification	Test Conditions & Methods
Item	Specification	Test Conditions & Methods
Rated Zero-Power Resistance RN (Ω)	20±20%	Ambient temp. Range:25℃±1℃(TA). Testing voltage: 1.5VDC. After placing for 1~2 hours under TA, the resistance value shall be measured.
Thermal Dissipation Constant	≈24	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.
Thermal Time Constant	≈113	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.
Material Constant B	3200±10%	R1 , R2 is zero-power resistance at T1 , T2 T1 = 298.15 K(25℃) T2 = 323.15 K(50℃)
Max.Steady State Current	No visible mechanical damage. ΔRN / RN ≤20% (ΔR =∣RN-RN'∣)	Ambient temperature: 25℃±2℃. Test current 1A

Mechanical Characteristics

Item	Specification	Test Conditions & Methods
Solder-ability	The terminals shall beuniformly tinned, and its area≥95%	Dipping the NTC terminals toa depth of 15mm in a solderingbath of 240- 245℃andto the place of 6mm far from NTCbody for2-3s (See IEC68-2 20/GB2423.28 Ta )
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 265±3℃ and to the place for 6mm below from NTC body for 10±1s.After recovering4-5h under 25±2℃. The rated zero power resistance value RN' shall be measured. (See IEC68-2-20/GB2423.28 Tb)
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	Specification	Test Conditions & Methods
Temp. Cycling Testing	No visible mechanical damage. ΔRN / RN ≤20% (ΔR =∣RN-RN'∣)	Ta:-40±3℃/ 30min→25±2℃/ 5min→ Tb:200±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.
Electrical Cycling Testing	No visible mechanical damage. ΔRN / RN ≤20% (ΔR =∣RN-RN'∣)	Ambient temp. Range:25℃±2℃. Cycles: 1,000times On / Off: 1m / 5m Test Current 5A After recovering 4~5h under 25±2℃, the rated zero power resistance value RN' shall be measured.
LoadLife ( Endurance ) Testing	No visible mechanical damage. ΔRN / RN ≤20% (ΔR =∣RN-RN'∣)	Ambient temp. Range:25℃±2℃;5A/ 1,000±24h After recovering 4~5 h under 25±2℃, the ratedzero power resistance value RN' shall be measured.
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.

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