Alpha PB Series

  • Compliant
  • Alpha Electronics

Product Features

  • Ultra-precision power resistor
  • Resistance range form 0.4Ω to 50kΩ
  • Tolerance from ±0.02% to ±5%
  • TCR of ±2.5 ppm/°C, ±5 ppm/°C or ±15 ppm/°C
  • Power rating of upto 10W (on a heat sink at 125°C)
  • Temperature range from -55°C up to +155°C

Applications

  • Scientific Instrumentation

Description

The PB ultra-precision through-hole power resistor series from Alpha Electronics offers a power rating of up to 10W on a heat sink using the mounting tabs provided or 2W in free air (at 25°C) with a wide resistance range from 0.4Ω to 50kΩ. 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 1Ω and 50kΩ as well as tight tolerances down to ±0.01% between 50Ω and 50kΩ.

  • Ultra-precision through-hole power resistor
  • Each resistor is available in any resistance between 0.4Ω and 50kΩ
  • 2-Terminal through-hole case-encapsulated package with heat sink mounting
  • Power rating of 10W on a heat sink or 2W in free air at +25°C
  • Tight tolerances as low as ±0.01% available between 50Ω and 50kΩ
  • Tight TCR available of ±2.5 ppm/°C between 1Ω and 50kΩ
  • Maximum working voltage of 750V
  • Maximum working current of 5A
  • Maximum rated operating temperature +25°C
  • Temperature range from -55°C up to +155°C

 

The PB case-encapsulated, through-hole, ultra-precision power resistor series exhibits excellent high frequency characteristics thanks to Alpha’s Bulk Metal® foil resistor technology, making them suitable for the most demanding precision and high power applications.

Pin pitch for the Alpha PB series is 15.0 ±0.5mm.

 

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

Alpha PB Specifications
* Symbols parenthesized are for part number composition
✝ Resistance figures for type PB are the values obtained by measuring the leads at point 12.7±3.2mm away from the root, but in case of resistance value below 10Ω, the values at 5.08 ±0.6mm away
** For heat sinking, an aluminium chassis in 152.4 (L) x 101.6 (W) x 50.8 (H) x 1.0mm (T) shall be used

 

Specifications

Weight 0.00000 kg
Dimensions 40.00 × 5.00 × 20.00 mm
Product Type

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Minimum Resistance

Resistance Value

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Maximum Resistance

Series / Model

Tolerance

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Power Rating

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Temperature Coefficient

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Package / Size

Temperature Range (°C)

Alpha PB 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 PB Series

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