Alpha RBH Series

  • Compliant
  • Alpha Electronics

Product Features

  • Ultra-precision current sensing resistor
  • Resistance range form 0.01Ω to 0.1Ω
  • Tolerance from ±0.5% to ±5%
  • TCR of ±10 ppm/°C or ±25 ppm/°C
  • Power rating of 1.5W (at 70°C)
  • Temperature range from -65°C to +155°C

Applications

  • Test and Measurement

Description

The RBH ultra-precision current sense resistor series from Alpha Electronics offers low resistances of between 0.01Ω and 1Ω all in a small 4-terminal (Kelvin connection) flip-chip package. By utilising Alpha’s Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.5% as well as a low TCR of ±10 ppm/°C between -25°C and +125°C.

  • Ultra-precision current sense flip-chip resistor
  • Available in any resistance between 0.01Ω and 1Ω
  • 4-terminal (Kelvin connection) current sense resistor in a flip-chip surface-mount package
  • Power rating of 1.5W at +70°C
  • Tolerances as low as ±0.5% over the whole resistance range of 0.01Ω to 1Ω
  • Tight TCR available of ±10 ppm/°C over the resistance range of 0.01Ω to 1Ω
  • Maximum rated operating temperature +70°C
  • Temperature range from -65°C up to +155°C

 

The RBH ultra-precision current sense resistor series offer ultra-precision thanks to Alpha’s Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.

Temperature rise of resistor surface can be optimised by using a board made of metal. This keeps the temperature rise very low allowing increased power rating of the parts i.e. 2W at +70°C. Please keep the temperature of board less than +90°C when using glazed epoxy board.

 

The below table gives the full specifications for each resistor model available including the Alpha RBH series:

Alpha RBH Specifications
* Symbols parenthesized are for part number composition 

 

Specifications

Weight 0.00000 kg
Dimensions 7.50 × 6.00 × 1.50 mm
Product Type

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Resistance Value

Minimum Resistance

Series / Model

Maximum Resistance

Tolerance

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Power Rating

Temperature Coefficient

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Termination / Connection Type

,

Temperature Range (°C)

Alpha RBH Series Resources

Product Datasheet

Supporting Product Information

Supporting Manufacturer Information

Alpha Resistor Videos

We are pleased to provide you with a range of videos, please see below for the latest content available:

 

 

VIDEOS
Place holder video for YouTube video Resistor Stability Put to the Test (Demo Video)

In this video, our host Richard Zuratt puts the stability of the three major resistor technologies — foil, thin, and thick film — to the test. Each resistor type is subjected to an overload pulse and its change in resistance value is recorded. Due to the homogeneous nature of the VPG Bulk Metal® Foil resistor, it is the only of the three to experience no change from the high power pulse. This demonstrated performance makes foil resistors the technology of choice for critical applications where long-term stability and survivability are paramount.

Place holder video for YouTube video Advantages of Using Bulk Metal® Foil Resistors in High-Humidity Environments

All resistors that are based on nichrome, which is a category that includes both thin film devices and Bulk Metal Foil resistors, are susceptible to electro-chemical corrosion or etching when placed in a high humidity environment and powered with a very low wattage. But since the nichrome element of a Bulk Metal Foil resistor is hundreds of times thicker than the element in a thin film device with the same value, it will last much longer under these conditions. This video shows the actual etching process and survival times for thin film and foil nichrome resistive elements as they are tested in 100% humidity conditions.

Place holder video for YouTube video Comparison Testing of Chip Resistor Technologies Under High Vibration

Surface-mount resistors suffer physical stresses when exposed to high vibration or thermally unstable environments. Failure modes commonly occur in welds, solder joints, connectors, and terminations, ultimately resulting in circuit failure. In this demonstration, vibration-table-mounted boards are subjected to ±2° deflection 25 times per second and monitored for any ΔR > 0.1%. All the chip resistors failed in 2 to 12 minutes (8K to 16K cycles). But the Alpha MPP molded Bulk Metal® Z-Foil resistor with flexible terminations experienced over a million cycles with no change in resistance.

VIDEOS
Place holder video for YouTube video
Resistor Stability Put to the Test (Demo Video

In this video, our host Richard Zuratt puts the stability of the three major resistor technologies — foil, thin, and thick film — to the test. Each resistor type is subjected to an overload pulse and its change in resistance value is recorded. Due to the homogeneous nature of the VPG Bulk Metal® Foil resistor, it is the only of the three to experience no change from the high power pulse. This demonstrated performance makes foil resistors the technology of choice for critical applications where long-term stability and survivability are paramount.

Place holder video for YouTube video
Advantages of Using Bulk Metal® Foil Resistors in High-Humidity Environments

All resistors that are based on nichrome, which is a category that includes both thin film devices and Bulk Metal Foil resistors, are susceptible to electro-chemical corrosion or etching when placed in a high humidity environment and powered with a very low wattage. But since the nichrome element of a Bulk Metal Foil resistor is hundreds of times thicker than the element in a thin film device with the same value, it will last much longer under these conditions. This video shows the actual etching process and survival times for thin film and foil nichrome resistive elements as they are tested in 100% humidity conditions.

Place holder video for YouTube video

Surface-mount resistors suffer physical stresses when exposed to high vibration or thermally unstable environments. Failure modes commonly occur in welds, solder joints, connectors, and terminations, ultimately resulting in circuit failure. In this demonstration, vibration-table-mounted boards are subjected to ±2° deflection 25 times per second and monitored for any ΔR > 0.1%. All the chip resistors failed in 2 to 12 minutes (8K to 16K cycles). But the Alpha MPP molded Bulk Metal® Z-Foil resistor with flexible terminations experienced over a million cycles with no change in resistance.

Alpha RBH Series

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