Shenzhen PakHeng Electronics Ltd


Catalogue


Contact US


Tel: 86-755-86229698


Fax : 86-755-86229508


Email: sales01@pakheng.com / sales20@pakheng.com 


Address: The 3rd Industry Zone, Yanchuan, Songgang, Baoan District, Shenzhen, Guangdong, China

Metal Oxide Film Fixed Resistors

Metal Oxide Film Fixed Resistors

Metal-oxide film resistors are fixed form, axial resistors. They are made of ceramic rod that is coated with a thin film of metal oxides, such as tin oxide. Metal oxide film resistors must not be confused with metal oxide varistors, made of zinc oxide or silicon carbide.

      Pak Heng Electronics Co.,Ltd is one of the leading metal oxide film fixed resistors manufacturers and suppliers in China, offering the free sample and competitive price. Welcome to wholesale the high quality bulk resistors made in China from us. It if of good performance and high safety.


    Properties

    Metal oxide film resistors exceed the performance of metal film and carbon film for the following properties: power rating, voltage rating, overload capabilities, surges and high temperatures. Designers choose often the metal oxide film resistor for high endurance applications. For an overview of resistor types with their properties, look here. Stability properties are less good than for the metal film resistor. The metal oxide film resistors have poor properties for low values and tolerance. The temperature coefficient is around 300 ppm/°C, which is higher than for metal film types.


    The resistance material for metal oxide resistors is tin oxide that is contaminated with antimony oxide, this is to increase the resistivity. Metal oxide resistors can withstand higher temperatures than carbon or metal film resistors. The noise properties are similar to carbon resistors.



    Part No.

    Power

    Resistance range

    Dimensions

    Max. orking voltage

    Max.overload voltage

    Max.Pulse voltage

    Max.insulation voltage

    L±1

    D±0.5

    d±0.05

    CMO016

    MOR016

    1/8W

    1/6W

    0R~1M

    3.2

    1.7

    0.41

    150V

    300V

    300V

    200V

    CMO14S

    MOR14S

    1/4Ws

    0R~1M

    3.2

    1.7

    0.41

    150V

    300V

    300V

    200V

    CMO014

    MOR014

    1/4W

    0R~1M

    6.0

    2.3

    0.45

    200V

    400V

    500V

    250V

    0.52

    CMO12S

    MOR12S

    1/2WS

    0R~1M

    6.0

    2.3

    0.45

    200V

    400V

    500V

    250V

    0.52

    MOR012

    1/2W

    0R1~1M

    9.0

    3.2

    0.52

    250V

    400V

    500V

    250V

    MOR01S

    1WS

    0R1~1M

    9.0

    3.2

    0.58

    350V

    600V

    750V

    350V

    MOR01B

    1W

    0R1~1M

    11.0

    4.5

    0.75

    350V

    600V

    750V

    350V

    MOR02S

    2WS

    0R1~1M

    11.0

    4.5

    0.75

    350V

    600V

    750V

    350V

    MOR02B

    2W

    0R1~1M

    15.0

    5.0

    0.75

    350V

    600V

    750V

    350V

    MOR03S

    3WS

    0R1~1M

    15.0

    5.0

    0.75

    350V

    600V

    750V

    350V

    MOR03B

    3W

    0R1~1M

    24.0

    8.0

    0.75

    500V

    800V

    1000V

    500V

    MOR05S

    5WS

    0R1~1M

    24.0

    8.0

    0.75

    500V

    800V

    1000V

    500V


     Test Item

    Test Condition

    Performance

    Temperature coefficient

    Test the resistance value at normal temperature and normal temperature added 100℃,calculate per℃ resistance value change rate .

    ±350ppm/℃

    Short time overload

    2.5 × rated voltage or Max.overload voltage (get the lower) for 5 seconds.

    ΔR≤±1%R0+0.05Ω

    Pulse overload

    At 4 x rated voltage or Max. pulse overload voltage (get the lower) cycle 10000±200 times(1 second on, 25 seconds off ).

    ΔR≤±2%R0+0.05Ω

    Resistance to soldering heat

    Immerge into 350±10℃ tin stove for 2~3 seconds.

    ΔR≤±1%R0+0.05Ω

    Solderability

    Immerge into 245±3℃ tin stove for 2~3 seconds.

    The area of soldering is over 95%

    Temperature cycling

    At  -55℃ for 30 min, then at +25℃ for 10~15 min, then at +125℃ for 30 min, then at +25℃ for 10~15 min, total 5 cycles.

    ΔR≤±1%R0+0.05Ω

    Load life in humidity

    Overload rated voltage or Max.working voltage (get the lower) for 1000 hours (1.5 hours on and half-hour off ) at the 40±2℃ and 90~95% relative humidity.

    ΔR≤±5%R0+0.05Ω

    Load life in heat

    Overload rated voltage or Max.working voltage (get the lower ) for 1000 hours (1.5 hours on and half-hour off) at the 70±2℃.

    ΔR≤±5%R0+0.05Ω

    Nonflammability

    Respectively load AC voltage by 51016 times rared power for 5 minutes.

    No visible flame


    Typical Applications

    Many properties of metal oxide film resistors are similar to metal film resistors. For basic use, metal film and metal oxide film are currently the predominant resistor types. Compared to carbon film, the prices are just as low. Only for dissipation values above 1 watt combined with reasonable stability, the carbon film resistors are still more cost efficient.

    Construction

    The metal oxide film is mostly produced with chemical deposition methods. Almost always a ceramic carrier is used as substrate. The deposition process involves the reaction of a pure metal with a gas at high temperature and at a low pressure. A very common metal oxide film is tin oxide. The film is established by heating the resistor body in a tin chloride vapor. Other metal oxide films have usually a different deposition process. Firstly a thin metal film is applied, which is afterwards reacted with oxygen. The desired composition is achieved by measuring the resistance of a test piece.

    After the film is applied to the resistor body, the final resistance value is achieved by applying a helical cut. This is usually done by laser cutting, while in the past it was done by grinding or sandblasting. The spiral cut makes the resistance path longer and of smaller cross section, and can increase the resistance value up to thousand times greater than before the cut. The resistance value can be accurately controlled by the cutting. During the cutting process, the resistance is measured to allow for small corrections.

    History

    Metal oxide film resistors were the first alternatives to carbon composition resistors. They were in the past easier to manufacture than metal film resistors. Nowadays however, their numbers decrease and they are less and less available.


    Product Detail

    Basic Info

    • Resistance:Fixed Resistor

    • Material:Metal Film Resistor

    • Packaging:Throught Hole

    • Origin:Shenzhen city, China

    Product Description

    Our factory manufacture many kinds of Metal Oxide Film Fixed Resistors, 1/6w, 1/4w, 1/2w, 1w, 2w, 3w. We can provide low price about resistor.

    Feature: 

    1.Good performance in moisture resistance, anti-oxidization, good thermal stability, nonflammability, overload stability.

    2.perating ambient temperature: -55~+155.

    3.The surface is nonflammable, the normal size coating is brick red and the smalli size coating is green.

    4.Resistance tolerance:±2%、±5%.

Hot Tags: metal oxide film fixed resistors, China, suppliers, manufacturers, wholesale, price, bulk, free sample, made in China
Related Products
Inquiry