Alpha FNP Series

Alpha FNP Series

The FNP high power precision shunt resistor series from Alpha Electronics offers a range of very high precision current sensing shunts with a maximum power rating of 500W on a suitable heat sink at +25°C. By utilising a Ni-Cr Bulk Metal® foil resistor technology, they are able to produce resistors with low temperature coefficients. The FNP shunt resistor series has a built in Pt100 sensor for monitoring the temperature of the resistive element.

  • High power precision shunt resistor
  • Available in any resistance between 0.001Ω and 1Ω (higher values may be available upon request)
  • Tight tolerance options as low as ±0.05% available
  • Tight TCR options available of ±1 ppm/°C and ±2.5 ppm/°C (+25°C to +60°C) or ±5 ppm/°C (-25°C to +125°C)
  • Maximum rated power of 500W
  • Maximum working current of 320A
  • Maximum rated operating temperature +75°C (resistance values greater than 0.01Ω, +25°C for resistances of 0.01Ω or below)
  • Working temperature from -55°C up to +125°C
  • Single pulse power load of 50J (<10ms)

The Alpha Electronics FNP precision shunt resistor series are constructed out of the following materials:

  • Base plate - Nickel-plated Copper
  • Current terminals - Nickel-plated Copper (T = 1.0mm)
  • Voltage and Pt terminals - Nickel-plated Copper (T = 0.5mm)
  • Package - PPS injection-moulded case

Alpha's Ni-Cr Bulk Metal® foil resistor technology means these high power precision shunt resistors resistors are ideal in applications like:

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

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

Alpha FNP Specifications

* Keep temperature of the resistive element surface less than +125°C
** Please contact us for higher resistance values

Specifications
Additional Features
  • High power precision shunt resistor
  • Utilises Ni-Cr Bulk Metal® foil technology enabling low TCR
  • Low thermal resistance with Copper plate - improved to 0.1°C/W from 0.3°C/W (conventional model)
  • Extended maximum ambient temperature to +125°C (+85°C with conventional model)
  • Built-in Pt100 resistive sensor element for temperature monitoring
Maximum Power Rating
  • 500W (on heat sink)
Maximum Resistance
Minimum Resistance
  • 0.001Ω
TCR-25°C to +60°C:
  • ±1 ppm/°C (Z)
  • ±2.5 ppm/°C (Y)
-25°C to +125°C:
  • ±5 ppm/°C (X)
Tolerance
  • ±0.05% (A)
  • ±0.1% (B)
  • ±0.5% (D)
  • ±1.0% (F)

We are pleased to provide you with a range of additional content including videos, product datasheets, case studies, white papers and application notes for your reference. Please see below for the latest content available:

 

 

DOCUMENTATION
PDF DocumentAlpha Electronics FNP high power precision shunt resistor series datasheet
PDF DocumentAlpha Electronics manufacturing process, adjustment of resistance value construction, and temperature characteristics of resistance information which covers their resistor range including typical characteristics such as their typical 0.14 ppm/°C TCR
PDF DocumentAlpha Electronics additional services and custom products available to compliment their precision and ultra-precision resistor ranges
PDF DocumentAlpha Electronics ultra-precision resistors databook, covering all parts and models they have to offer

 

 

 

VIDEOS
Resistor Stability Put to the Test (Demo Video)

In this video, host Richard Zuratt from VPG 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.
A head to head comparison of the survival rates of precision thin film nichrome (NiCr) resistors versus VFR Bulk Metal Foil resistors in a high humidity environment.

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.
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
Resistor Stability Put to the Test (Demo Video)

In this video, host Richard Zuratt from VPG 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.
A head to head comparison of the survival rates of precision thin film nichrome (NiCr) resistors versus VFR Bulk Metal Foil resistors in a high humidity environment.

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.
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.

RoHS Compliance

This product is available fully compliant to the RoHS EU directive 2011/65/EU.

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