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Power thermistor, surge current suppression

In order to avoid the surge current generated in the boot of the moment in an electronic circuit, connected to a power type NTC thermistor in series in the circuit, can effectively inhibit the surge current during startup, and after complete inhibition of surge current, the electric resistance of power type NTC thermistor will fall to very small degree, not impact on the working current is normal, so the use of power type NTC thermistor in the power supply circuit, is to suppress the surge boot time, to ensure the most simple and effective measures for electronic equipment from damage.

Power thermistor
 

PART NO.
DAE5-D9MUSB

NTC THERMISTOR
2.5 Ω

REV NO.
0/A (Aug.30th,2006 )
1. APPEARANCE
 
1-1. Dimensions (mm)
 
 
         Power thermistor
1-2. Marking
■    NTC
      2.5D-9
□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
DMax: 10.5mm
TMax: 6.0mm
F: 5.0±1.0mm
 
d: 0.8±0.06mm
Lmin:15mm
 
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.
 
DAE5-D9MUSB

NTC THERMISTOR
2.5 Ω

REV NO.
0/A (Aug. 30th, 2006 )
 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
RN (W)
2.5±20%
Ambient temp. Range:25℃±2℃(TA).
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)
11
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)
35
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)
2600
B=T1T2/(T2-T1)×Ln (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.
DAE5-D9MUSB
NTC THERMISTOR 2.5 Ω
REV NO.
0/A (Aug. 30th, 2006 )
3-1-5.Max.Steady State Current
 (A)
            4A
No visible mechanical damage.
ΔRN / RN ≤20%
(ΔR =∣RN-RN'∣)
Ambient temp. Range:25℃±2℃.
Testing Current:4A
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: 4A
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℃;  4A/ 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.
DAE5-D9MUSB

NTC THERMISTOR 2。5 Ω

REV NO.
0/A (Aug. 30th, 2006 )
5. INSPECTION
5-1. Lot Inspection
Sampling with IEC410 / DIN ISO 2859-1 (GB/T2828.1-2003) ;  Testing with SPEC.NO.: WWSMF21-09.
 
Item
IL
AQL
 
Item
IL
AQL
Appearance
0.65
Rated Zero-Power Resistance
RN
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
 
DAE
-
2R5
-
D9
M
U
S
B
 
                ②       ③    ④  ⑤  ⑥  ⑦  

Series:
② Rated Zero Power Resistance: 5 - 5Ω   2R5 – 2.5Ω
③ Disc. Diameter:  D9 - 9mm   D15 - 15mm
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
 
0
 
1
 
01
 
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,
 
 
PART NO.
  
DAE5-D9MUSB

NTC THERMISTOR  2.5 Ω

REV NO.
 
0/A (Aug. 30th, 2006 )
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 Imax.
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.)
 
 

 

 

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