Alpha Electronics

Alpha Electronics has been a manufacturer of VPG Bulk Metal® Foil resistors since 1978. Known worldwide for their accuracy and reliability, the components are widely used in a range of applications, including automatic test equipment (ATE); weighing scales; precision instrumentation; aerospace, military, laboratory and metrology, and medical systems; industrial process control; high-end audio; and more.

Alpha Electronics continues to focus on the needs of today and the requirements of the future.

Contact the Charcroft Sales Team for further information.

Standard Resistor Series | PDF  |  Ultra Precision Resistors | PDF


APR, a VPG Foil Resistors brand, has taken high precision resistors to a new level -now standardized and affordable to all. Designed and manufactured in their fully automated plant in Japan, allow us to introduce you to… the RWX Series.


  • Package sizes: 0603, 0805, 1206
  • TCR: 0±5 ppm/°C
  • Tightest tolerance: ±0.01%
  • Load-life stability: ±0.005% (typical, 70°C, 2000 hrs., rated power)
  • Fast delivery
  • MOQ 10k
  • AEC-Q200 qualified

Product Documentation

RWX Series Data Sheet | PDF


  • Temperature coefficient of resistance (TCR)
  • Utilizing Ni-Cr Bulk Metal® Foil Technology for realizing low TCR
  • Low thermal resistance with Copper plate
  • Extended max. ambient temperature to 125°C (85°C with conventional model)
  • Built-in Pt100 sensor monitor temperature of resistive element


  • Output reference of precision power supply
  • Reference of charge-discharge test for high capacity batteries

Construct of Materials:

  • Base plate: Nickel-plated Copper
  • Current terminal: Nickel-plated Copper (T = 1.0 mm)
  • Voltage and Pt terminals: Nickel-plated Copper (T = 0.5 mm)
  • Package: PPS Injection-molded case

Product Documentation

FNP Series Data Sheet | PDF

The PE ultra-precision power shunt resistor series from Alpha Electronics offers 4-terminal (Kelvin) connection for current sensing and a power rating of up to 10W on a heat sink or 1.5W in free air (at +70°C) over a resistance range of 0.5Ω to 500Ω. By utilising Alpha’s Bulk Metal® foil resistor technology, they are able to offer low temperature coefficients down to ±2.5 ppm/°C between the resistance range 5Ω and 500Ω as well as tight tolerances down to ±0.01% between 25Ω and 500Ω.


  • Ultra-precision through-hole power shunt resistor
  • Each resistor is available in any resistance between 0.5Ω and 500Ω
  • 4-terminal (Kelvin) connection TO package shunt
  • Power rating of 10W on a heat sink or 1.5W in free air at +70°C
  • Tight tolerances as low as ±0.01% available between 25Ω and 500Ω
  • Tight TCR available of ±2.5 ppm/°C between 5Ω and 500Ω
  • Maximum working current of 5A

Product Documentation

PE Series Data Sheet | PDF

The RWB precision wraparound SMD resistor series from Alpha Electronics offers resistances from 10Ω up to 10kΩ, all with a small 0805 chip size. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.02% (between 1kΩ and 10kΩ) as well as a low TCR of ±2 ppm/°C (between -25°C and +125°C) from 100Ω up to 10kΩ. The Alpha RWB series also offers excellent load-life stability of ±0.005% typical (+70°C, 2000 hours at rated power).


  • Precision sense resistor
  • 4 to 20mA measurement
  • Resistance temperature detector
  • RTD sense resistor
  • High stability resistor
  • Industrial measurement resistor
  • Process control current measurement
  • High precision and stable Bulk Metal® Foil resistor with 0603, 0805 and 1206 package
  • TCR: 0±2 ppm/°C, 0±5 ppm/°C
  • Resistance tolerance: up to ±0.01%
  • Load-life stability: ±0.005% (typical, 70°C, 2000 hrs., rated power)
  • No standard resistance value (example: 1K234Ω)
  • MOQ: 100 pieces

Product Documentation

RW Series Data Sheet | PDF