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20mm NTC Power Thermistor 20D , Semiconductor Ceramic Element

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20mm NTC Power Thermistor 20D , Semiconductor Ceramic Element

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Brand Name :	UCHI
Certification :	5D-20
Model Number :	UL.VDE.SGS.
Price :	Negotiable
Delivery Time :	3~5 working days
Payment Terms :	T/T,Paypal,Western Union,Money gram
Supply Ability :	8000,000,000PCS Per Month

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20mm NTC Power Thermistor 20D , Semiconductor Ceramic Element

20mm NTC Power Thermistor 20D , Semiconductor Ceramic Element

Quick Detail:

• Small Size and fast response

• High Power handling capability

• Fast response to surge current

• High material constant (B value)

• Low residual resistance

• Wide operating temperature range -55 to +200C

• R25 allowable tolerance is ±20%

• Long-term Stability and Reliability

Description:

The MF72 power NTC thermistor is a kind of semiconductor ceramic element that mostly made from transition metal oxide material, and belongs to negative temperature thermistors. When you tune on an electrical equipment ,the surge current can be restrained by a power NTC thermistor connected in series with the power circuit .Because of the continuing action of current, temperature of power NTC thermistor raising, the resistance will rapidly drop to a small value, the consumed power can be ignored. So it can not affect normal operating current. Therefore, using power NTC thermistor is a most effectively amd most brief measure to restrain surge current, protecting electrical equipment from destruction.

Applications:

Can be installed into the power circuits of:

• Power supplies and inverters

• Uninterruptible Power Supplies

• Energy saving lamps

• Electronic Ballasts

• Filament Protection of various types of lamps

• Some types of heaters

• For higher power circuits ask about the MF73

and MF74 series surge suppressors.

Specifications:

Part No.: MF72-5-D20MSSB			NTC THERMISTOR 5Ohm				Rev.: 1/A (2012.06.29)
1. APPEARANCE
1-1. Dimensions (mm)						1-2. Marking ■ NTC 5D-20 □No marking
						1-3.Coating □ No coating ■ Coating
						Material ■PF resin □Silicon □Epoxy □Others		Color □Green □Red □Tan ■Black □Blue
						1-4. Leads □Tin – plated copper wire ■Tin-plated steel wire ■Straight □ Axis-formed □In-Forming □ No Lead
D_Max: 22.0	T_Max: 7.0			F: 7.5/10±1.0
d: 0.8/1.0±0.5	L_Min: 29
2. MECHANICAL CHARACTERISTICS
Item		Specification			Test Conditions & Methods
2-1. 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 )
2-2. 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)

Part No.: MF72-5-D20MSSB		NTC THERMISTOR 5Ohm			Rev.: 1/A (2012.06.29)
2-3. 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)
3.ELECTRICAL CHARACTERISTICS
3-1.Test Conditions & Method
Items		Spec.		Test Conditions & Methods
3-1-1.Rated Zero-Power Resistance R_N (Ohm)		5±20%		Ambient temp. Range:25℃±2℃(T_A). Testing voltage: 1.5VDC After placing for 1~2 hours under TA, the resistance value shall be measured.
3-1-2.Thermal Dissipation Constant (mW/°C)		25		The thermal dissipation constant(d) could be calculated by the ratio of a change in power dissipation(DP) of the thermistor to a change in temperature(DT) of the thermistor at a specified ambient temperature
3-1-3.Thermal Time Constant t (s)		103		The time(t) 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
3-1-4.Material Constant B (°K)		3000±5% B=T₁T₂/( T₂- T₁) ×L_n (R₁/R₂)		R₁ , R₂ is zero-power resistance at T₁ , T₂ T₁ = 298.15°K(25°C) T₂ = 323.15°K(50°C)

Part No.: MF72-5-D20MSSB	NTC THERMISTOR 5Ohm		Rev.: 1/A (2012.06.29)
3-1-5.Max.Steady State Current (A)	8 No visible mechanical damage. ΔRN / RN ≤20% (ΔR =∣RN-RN'∣)	Ambient temp. Range:25℃±2℃. Testing Current :7A
4. Reliability Test
Items	Spec.	Test Conditions & Methods
*4-1. 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.
*4-2. 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.
*4-3.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.
*4-3. 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.

Part No.: MF72-5-D20MSSB

NTC THERMISTOR

Rev.: 1/A (2012.06.29)

5. INSPECTION

5-1. Lot Inspection

Sampling with IEC410 / DIN ISO 2859-1 (GB/T2828.1-2003) ; Testing with SPEC.NO.: WWSMF21-15-18.

Item

AQL

Item

AQL

Appearance

Ⅱ

0.65

Rated Zero-Power Resistance RN

Ⅱ

0.65

Soldering-ability

S-2

2.5

Max.Steady State Current (A)

S-2

2.5

5-2. Periodic Inspection

See the items with

6. NUMBERING SYSTEM AND PACKING

6-1. PART NUMBERING

MF72

D20

　 ① ② ③ ④ ⑤ ⑥ ⑦　　

① Series: MF72 - For limiting of inrush current

② Rated Zero Power Resistance: 5 - 5Ω

③ Disc. Diameter: D15 - 15mm D11 - 11mm

④ Tolerance of Resistance: M - ±20% K - ±10%

⑤ Shape of Leads: U - In-formed S - Straight

A - Axis Formed N - No Leads

⑥ Coating Material :S - Silicone N - No Coating

P - PF Resin E - Epoxy

⑦ Packing Type :B - Bulk A - Ammo R - Reel

6-2.Lot Numbering

① ② ③

① Year of ex-factory 0: 2000 (1: 2001, …, 9: 2009)

② Month of ex-factory 1: January (2: Feb,…, 9: Sep, O: Oct, N: Nov, D: Dec).

③ Serial number of ex-factory in current month: 01～99: No. 01～99, J0: No.100, J1～J9: No.101～109, K0:No.110,

K1～K9: No.111～119, S0: No.190, S1～S9: No.191～199, T0: No.200, …

Part No.: MF72-5-D20MSSB

NTC THERMISTOR

5Ohm

Rev.: 1/A (2012.06.29)

6-3. Packing Type

■ Bulk

□ Ammo

□ Reel

7. Operating Temperature Range:

-55 ~ + 200℃

8. STORAGE CONDITIONS:

8-1.Temperature: -10℃～+40℃

8-2. Humidity: ≤70%RH

8-3. Term: ≤6 months (First-in/ First-out)

8-4. Place:

Do not exposing the components to the following conditions, otherwise, it may result in deterioration of characteristics.

1) Corrosive gas or deoxidizing gas.

2) Flammable and explosive gases.

3) Oil, water and chemical liquid.

4) Under the sunlight.

8-5. Handling after seal open: After unpacking of the minimum package, reseal it promptly or store it inside a sealed container with a drying agent.

9. WARNING !

Do not apply the components under the following conditions, otherwise, it may result in deterioration of characteristics, destruction of components or in the worst case, to catching fire.

1) Exceeding I_max.

2) Exceeding rated temperature range.

3) Inferior thermal dissipation (Due to badly inferior thermal dissipation, some part of the components body will become overheated and then be damaged.)

Competitive Advantage:

Factory supply directly
Completed certificates such as UL,VDE,SGS,etc and high quality available
Quick delivery
Best after-sales services
OEM & ODM available

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