美隆電子有限公司

Mayloon Electronic Co., Ltd.,

  • 增加字體大小
  • 預設字體大小
  • 減少字體大小
Home

Ultra Metal Film Resistor

E-mail 列印

Resistor 超小型金屬膜電阻

PDF File  Data Spec Ultra Miniature Metal Film Resistor - UMR Series

Resistor INTRODUCTION
The UMR Series flame-proof type miniature Metal Film Resistors are manufactured by vacuum depose it metal film on
high thermal conductivity and specific gravity Rosenthal ceramic or same grade Japans rods. The both ends of
ceramic are coated with precision mixed metals which help to prevent against noise, and to provide low TCR
and low Tol precision resistors the can meet MIL and JIS requirement.
Utilizing a 95~98% of AI ceramic cores and combined a special cutting technology inside, this resulting superior
resistors give excellent heat dissipation, stable performance and significantly up-grade the power rating.
This specially designed resistors are widely used by the industries of communication devices, meters,
high-class, audio equipments and precision military defending facilities as well.
Resistor EXTERNAL DIMENSIONS SINLOON®
STYLE DIMENSION (mm)
L ΦD H Φd
UMR-01 3.3±0.4 1.8±0.3 28±2 0.5±0.05
UMR-02 6.3±0.5 2.3±0.3 28±2 0.6±0.05
UMR-03 6.3±0.5 2.3±0.3 28±2 0.6±0.05
UMR-10 6.3±0.5 2.3±0.3 28±2 0.6±0.05
UMR-20 9.0±0.5 3.2±0.5 26±2 0.6±0.05
UMR-30 15.5±1.0 5.0±0.5 32±2 0.6±0.05
The type designation shall be in the following form and as specified.
Resistor RATED POWER
Type Power Maximum Voltage Dielectric withstanding Resistance
Working Overload Voltage (AC) Range
UMR-01 0.4W 200V 400V 300V 1R~10MΩ
UMR-02 0.5W 250V 500V 500V 1R~10MΩ
UMR-03 0.6W 250V 500V 500V 1R~10MΩ
UMR-10 1W 250V 500V 500V 1R~10MΩ
UMR-20 1.8W 350V 700V 700V 1R~10MΩ
UMR-30 3W 500V 1KV 1KV 1R~10MΩ
Temp. Coefficient (by Type) ±50ppm, ±100ppm
Resistor FEATURES
Resistance Tolerance: ±1%, ±2%, ±5%.
Excellent long-term stability.
High power-to-size ratio for significant space saving.
Variety of packing: bulk, strip pack, 26mm and 52mm tape and reel, cut and foramen.

 

 
歡迎您瀏覽本網站 WELCOME TO MAYLOON
Mayloon Electronic Company Limited Mayloon Lighting Company Limited

Wrapper


Who's Online

現在有 182 訪客 在線上

Mayloon on-line chat now

即時業務接洽
QQ:1247069489
E-mail: peter@mayloon.com
TEL:852-2408 9788 M: 9180 8452

消息

美隆電子有限公司
好消息:
廣告機租售
大廈大堂電視招登廣告
歡迎來電查詢
MP.:91808452

Newsflash

以半導體構成的恆流源推動LED

LED驅動芯片 以半導體構成的恆流源推動

 

以半導體構成的恆流源推動LED

半導體可以構成相當穩定的恆流源,較以電阻控制電流穩定得多。一枚或多枚晶體管也可以構成簡單的恆流源,晶體管構成的恆流源簡單、成本低,使用運算放大器可以有更精確的電流控制,但線路較複雜,而且需要另加一個參考電壓源,成本大很多。這些線路的電流控制已相當精確,特別是使用運算放大器的線路,但功耗大、效率低的問題仍然是無法解決,對於大功率LED並不合適。最主要的原因是由於以線性方式控制電流,功耗消耗在電流控制元件內。

有些集成電路專為推動LED而設計,其檢測點做成的電壓降可以低至~0.2V的級數,這些集成電路多數都以開關式電源轉換]以控制LED電流恆定,開關式轉換配合mV級的檢測點電壓降使整體功耗十分低,但也有集成電路採線性電路控制LED的電流,例如用於單一枚鋰離子電池下推動白色光LED,由於採用線性電路,因功耗問題,輸出電流不能太大。