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[China]
Trade Verify
Address: No.1, Yixiang ,Liwu Industrial Park,Liwuyuan Village,Xihu District, Shilong Town,Dongguan 523325,Guangdong ,China
Contact name:James Lai
Dongguan Ampfort Electronics Co., Ltd. |
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Verified Suppliers
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1005 Metric SMD NTC Thermistor 0402 10kOhms 1% 3380K For Battery
Chargers
I Description Of The SMD NTC Thermistor 0402
NTC thermistor is a ceramic semiconductor thermal crystal sintered
from various metal oxides mainly manganese, cobalt and nickel. It
is extremely sensitive to temperature changes. Its zero-power
resistance varies with the body temperature. As the temperature
increases, the resistance value decreases exponentially, and the
temperature coefficient is as high as (3~6%/℃). A small temperature
change will cause a large resistance value change. According to the
R-T resistance temperature curve of the thermistor, the precise
resistance value of each temperature point can be measured. In the
circuit, the temperature can be digitally corresponded through the
resistance value for temperature measurement and
control.AMPFORT thermistors have low thermal time constants
which result in extremely high rates of resistance change to
accurately track the temperature.
II Features Of The SMD NTC Thermistor 0402
1. Excellent solderability and high stability in environment
2. Excellent long time aging stability
3. High accuracy in resistance and B-constant
4. Reflow soldering possible
5. Lead is not contained in the product.
6. Recognized by UL/cUL
III Applications Of The SMD NTC Thermistor 0402
Temperature sensing, protection and compensation in industrial,
telecom and consumer applications. Examples are:
• Battery chargers
• Power suppliers
• Office equipment
• LCD compensation
• In-car entertainment
IV Dimensional Drawing Of The SMD NTC Thermistor 0402 (unit:mm)
V Sample application: Temperature detection and temperature
compensation for smartphones and tablets
Many NTC thermistors are used in smartphones and tablets for
temperature detection and temperature compensation.
Fig. 1: Major temperature detection and temperature compensation
applications of NTC thermistors in smartphones and tablets
The basic circuit is a voltage-dividing circuit with an NTC
thermistor and a fixed resistor connected in series. The resistance
value of an NTC thermistor placed near a heat generating part such
as a CPU or a power module decreases with rise of temperature and
changes the output voltage of the voltage-dividing circuit.
This change is sent to a microcontroller to initiate temperature
compensation actions and protect circuit components from
overheating.
Fig. 2: Basic circuits for temperature detection and temperature
compensation
VI Main Techno-Parameters(In static air) Of The SMD NTC Thermistor 0402
| P/N | Resistance(25℃) | B Value(25/50℃)(K) | B Value(25/85℃)(K) | Permissible Operating Current(25℃)(mA) | Dissipation Factor (mW/℃) | Thermal Time Constant (s) |
| QN0402X102F3450FB | 1.0 | 3450±1% | 3500 | 1.00 |
| <3 |
| QN0402X152F3950FB | 1.5 | 3950±1% | 3987 | 0.81 | ||
| QN0402X222F3450FB | 2.2 | 3450±1% | 3500 | 0.67 | ||
| QN0402X222F3950FB | 2.2 | 3950±1% | 3987 | 0.67 | ||
| QN0402X332F3450FB | 3.3 | 3450±1% | 3500 | 0.55 | ||
| QN0402X332F3950FB | 3.3 | 3950±1% | 3987 | 0.55 | ||
| QN0402X472F3500FB | 4.7 | 3500±1% | 3545 | 0.46 | ||
| QN0402X472F3950FB | 4.7 | 3950±1% | 3987 | 0.46 | ||
| QN0402X682F3500FB | 6.8 | 3500±1% | 3545 | 0.38 | ||
| QN0402X682F3950FB | 6.8 | 3950±1% | 3987 | 0.38 | ||
| QN0402X103F3380FB | 10 | 3380±1% | 3435 | 0.31 | ||
| QN0402X103F3900FB | 10 | 3900±1% | 3935 | 0.31 | ||
| QN0402X153F3950FB | 15 | 3950±1% | 3987 | 0.25 | ||
| QN0402X223F3950FB | 22 | 3950±1% | 3987 | 0.21 | ||
| QN0402X333F4050FB | 33 | 4050±1% | 4100 | 0.17 | ||
| QN0402X473F4050FB | 47 | 4050±1% | 4100 | 0.14 | ||
| QN0402X473F4485FB | 47 | 4485±1% | 4545 | 0.14 | ||
| QN0402X493F3937FB | 49.1 | 3937±1% | 3973 | 0.13 | ||
| QN0402X503F4100FA | 50 | 4050 | 4100±1% | 0.13 | ||
| QN0402X683F4150FB | 68 | 4150±1% | 4210 | 0.12 | ||
| QN0402X683F4485FB | 68 | 4485±1% | 4545 | 0.12 | ||
| QN0402X104F4250FB | 100 | 4250±1% | 4310 | 0.10 | ||
| QN0402X104F4360FB | 100 | 4360±1% | 4403 | 0.10 | ||
| QN0402X104F4485FB | 100 | 4485±1% | 4545 | 0.10 | ||
| QN0402X154F4500FB | 150 | 4500±1% | 4582 | 0.08 | ||
| QN0402X224F3950FB | 220 | 3950±1% | 3987 | 0.06 | ||
| QN0402X224F4250FB | 220 | 4250±1% | 4310 | 0.06 | ||
| QN0402X224F4500FB | 220 | 4500±1% | 4582 | 0.06 | ||
| QN0402X334F3950FB | 330 | 3950±1% | 3987 | 0.05 | ||
| QN0402X334F4500FB | 330 | 4500±1% | 4582 | 0.05 |
| <3 |
| QN0402X474F4000FB | 470 | 4000±1% | 4045 | 0.04 | ||
| QN0402X474F4500FB | 470 | 4500±1% | 4582 | 0.04 | ||
| QN0402X684F4100FB | 680 | 4100±1% | 4135 | 0.03 | ||
| QN0402X684F4500FB | 680 | 4500±1% | 4582 | 0.03 |
VII Advantages Of The SMD NTC Thermistor 0402
NTC thermistors are temperature-sensitive resistor elements using
semiconductor ceramics with negative temperature coefficients
(NTC). That means that the resistance decreases exponentially with
rising temperature. The steeper the RT curve, the greater the
change in resistance within a specified temperature range. With
this property, they are often used as temperature sensors and also
used as temperature protection devices for purposes such as
temperature measurement and temperature compensation.
VIII Frequently Asked Question FAQ
Q: Are you manufacturer ?
A: Yes, we are manufacturer and distributor of famous brand such as
Littelfuse.
Q: Which city does your factory in ?
A: Dongguan City,Guangdong Province, China
Q: May i know your working time ?
A: Official working time is 8:00 ~ 12:00 AM, 1:30 ~ 5:30
PM.However, sales in our overseas department will do overtime
working and 7x24hours online.
Q: Do you accept custom made ?
A: Yes, we are professional in customization model based on rich
experiences and professional engineering.It’s helpful if you can
provide drawing or detailed specification should be.
Q: May i know your lead time ?
A: Lead time is 7 days for standard model and exact lead time
depend on detailed requirements if special model selected.
Q: May i receive samples before place order ?
A: Yes, generally samples is free but sample cost should be charged
if quantity is too many ,product cost is too much or new mould fee
required.
Q: What’s your payment terms ?
A: T/T, Paypal etc.
Q: What’s currency you can accept ?
A: Mainly US dollars and Chinese Yuan
Q: Does your package method safe for transportation ?
A: Yes, our package would be 10~1000pcs per plastic bag ->
multiple bags per box -> multiple boxes per carton and it is
safe for express/air/boat shipment.
