mobile | classic
Dataweek Electronics & Communications Technology Magazine

Follow us on:
Follow us on Facebook Share via Twitter Share via LinkedIn


Electronics Buyers' Guide

Electronics Manufacturing & Production Handbook 2019


Ultra-precision Mini-MELF resistors, designed for stability and accuracy
29 August 2001, Passive Components

BCcomponents achieved a world-first in the passive component industry when it introduced its range of ultra-precision thin-film Mini-MELF resistors targeted for use in high-accuracy, high-performance applications such as test and measurement equipment, process control instrumentation and aerospace electronics.

Available with tolerance values as low as ±0,02% and temperature coefficients as small as 5 ppm/K, UMA 0204 Mini-MELF resistors bring all the advantages of space-saving surface-mount components to applications where accuracy, stability and lifetime are important design parameters.

"Precision resistors are critical to the performance of a wide range of transducers and measurement circuits," said Joachim von der Ohe, Product Manager. "With the introduction of our ultra-precision UMA 0204 resistors, designers can replace existing metal-foil resistors with a smaller and lower-cost thin-film solution."

When determining the total error budget for precision resistors, their initial tolerance and temperature coefficient are only part of the story. Designers must also take into account the long-term drift in ohmic value due to ageing. This is particularly important in applications where a very long lifetime is required or where the component cannot easily be replaced, such as in space satellites, he says. It is also an important factor in the automotive electronics industry, where there is an increasing need to build modules that are capable of withstanding ever higher ambient temperatures, but at the same time are required to stay within pre-determined stability and precision requirements.

For a continuous power dissipation of 0,07 W, UMA 0204 resistors are guaranteed to drift no more than 1200 ppm (0,12%) during their minimum specified lifetime of 25 years. Even at their maximum rated power dissipation of 0,25 W, long term drift is guaranteed not to exceed 0,3%. The failure rate for UMA 0204 resistors is less than 0,7 x 10-9/h.

UMA 0204 resistors are available with initial tolerances of ±0,02, ±0,05, ±0,1 and ±0,25%, and temperature coefficients of 5, 10 and 15 ppm/K. The standard range includes all E192 values between 22 W and 221 kW, with other values available to special order.

Supplied By: Electrocomp
Tel: +27 11 458 9000
Fax: +27 11 458 9034/5
  Share on Facebook Share via Twitter Share via LinkedIn    

Further reading:

  • New EPCOS power line chokes
    23 October 2019, Electrocomp, Passive Components
    TDK has extended its range of EPCOS power line chokes to include six new types. The new components are available in three different core shapes with different rated currents and inductance values, delivering ...
  • Custom capacitor assemblies
    23 October 2019, RFiber Solutions, Passive Components
    Passive Plus offers custom capacitor assemblies for high power requirements, suitable for the fields of high-power RF, medical electronics, broadcast, semiconductor manufacturing, high magnetic ...
  • Die-cast enclosures in extended lengths
    25 September 2019, Electrocomp, Enclosures, Racks, Cabinets & Panel Products
    The 1590 die-cast enclosures family from Hammond Manufacturing consists of 41 different sizes in the standard rectangular and Stomp Box, painted variants. Stomp boxes, colour coded to provide quick ...
  • Big is beautiful: The benefits of large capacitors
    28 August 2019, Passive Components
    The capacitor is a prime example of a component where small is not always beautiful, as meeting electrical characteristics and safety demands means that a component small enough to solder directly onto ...
  • GNSS boards for dead-reckoning
    28 August 2019, Electrocomp, Telecoms, Datacoms, Wireless, IoT
    The Locosys RTK-4671-SHDR/MHDR is a high-precision GNSS RTK (global navigation satellite system real-time kinematics) solution targeting the smart driving and lane-level navigation markets. The newly ...
  • Qi-compliant wireless charging coils
    28 August 2019, Avnet South Africa, Passive Components
    Vishay has expanded its offering of Qi-compliant wireless charging transmitter and receiver coils with the introduction of 14 new products in industry-standard shield sizes. Consisting of eight single-coil ...
  • Rugged PFC capacitors
    28 August 2019, Electrocomp, Passive Components
    TDK’s DeltaCap X Black Premium is a new series of Epcos MKD capacitors for power factor correction (PFC). With rated voltages of between 440 V a.c. and 850 V a.c., the capacitors with an internal delta ...
  • LAN transformers for industrial Ethernet interfaces
    28 August 2019, Würth Elektronik eiSos, Passive Components
    Würth Elektronik eiSos is expanding its LAN transformer range with the WE-LAN AQ, designed for the elevated requirements in the industrial sector. It can be used in applications requiring up to 1000Base-T ...
  • Power inductors for LED headlights
    28 August 2019, Electrocomp, Passive Components
    TDK has expanded its lineup of metal core power inductors with the new SPM-VT series that is designed especially for the high thermal and current demands of automotive LED headlights. These wire-wound ...
  • Ferrite magnetic design tool
    26 June 2019, Electrocomp, Passive Components
    The MDT software from TDK allows application-related parameters to be calculated for all available Epcos ferrite cores and/or materials. It provides access to digitalised material data including their ...
  • N-channel enhancement mode FET
    26 June 2019, Electrocomp, Power Electronics / Power Management
    Diotec Semiconductor’s 2N7002 is a widely used small-signal MOSFET in SOT-23 package. With an RDS(on) of maximum 2 Ω, the component offers a lower on-state resistance than the common industry standard. ...
  • Shielded power inductors
    31 July 2019, RF Design, Passive Components
    High-temperature power inductors from Coilcraft are available with inductance values from 22 to 47 µH, current ratings up to 5,5 A, and low direct current resistance (DCR). The inductors in the XAL7050 ...

Technews Publishing (Pty) Ltd
1st Floor, Stabilitas House
265 Kent Ave, Randburg, 2194
South Africa
Publications by Technews
Dataweek Electronics & Communications Technology
Electronics Buyers’ Guide (EBG)

Hi-Tech Security Solutions
Hi-Tech Security Business Directory

Motion Control in Southern Africa
Motion Control Buyers’ Guide (MCBG)

South African Instrumentation & Control
South African Instrumentation & Control Buyers’ Guide (IBG)
Terms & conditions of use, including privacy policy
PAIA Manual


    Classic | Mobile

Copyright © Technews Publishing (Pty) Ltd. All rights reserved.