Alpha PD Series

  • Compliant
  • Alpha Electronics

Product Features

  • Ultra-precision power resistor
  • Resistance range form 0.1Ω to 10kΩ
  • Tolerance from ±0.02% to ±5%
  • TCR of ±2.5 ppm/°C, ±5 ppm/°C or ±15 ppm/°C
  • Power rating of upto 8W (on a heat sink at 25°C)
  • Temperature range from -55°C up to +155°C

Applications

  • Scientific Instrumentation

Description

The PD ultra-precision TO-220 through-hole power resistor series from Alpha Electronics offers a power rating of up to 8W on a heat sink or 1.5W in free air (at 25°C) over a wide resistance range of 0.1Ω to 10kΩ. 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 10kΩ as well as tight tolerances down to ±0.02% between 25Ω and 10kΩ.

  • Ultra-precision through-hole power resistor
  • Each resistor is available in any resistance between 0.1Ω and 10kΩ
  • TO-220 through-hole package
  • Power rating of 8W on a heat sink or 1.5W in free air at +25°C
  • Tight tolerances as low as ±0.02% available between 25Ω and 10kΩ
  • Tight TCR available of ±2.5 ppm/°C between 5Ω and 10kΩ
  • Maximum working voltage of 250V
  • Maximum working current of 4A
  • Maximum rated operating temperature +25°C
  • Temperature range from -55°C up to +155°C

 

The PD 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 applications. Their standard TO-220 package is commonly used for power semiconductor devices making them ideal for new power designs.

Pin pitch for the Alpha PD series is 5.08 ±0.5mm.

 

The below table gives a summary of the specifications and options available for the Alpha PD series:

Alpha PD Specifications
* Symbols parenthesized are for part number composition
✝ Resistance figures are the values obtained by measuring the leads at point 5.08 ±0.6mm away from the root
** 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 10.60 × 4.50 × 19.00 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 PD 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 PD Series

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