Metal Oxide Film Fixed Resistors

Product Detail

  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.	?R=±(1%R0+0.05O)
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 ).	?R=±(2%R0+0.05O)
Resistance to soldering heat	Immerge into 350±10? tin stove for 2~3 seconds.	?R=±(1%R0+0.05O)
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.	?R=±(1%R0+0.05O)
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.	?R=±(5%R0+0.05O)
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?.	?R=±(5%R0+0.05O)
Nonflammability	Respectively load AC voltage by 5?10?16 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%.