Alpha NMQ Series

Alpha NMQ Series

The NMQ ultra-precision thermosensitive resistor series from Alpha Electronics offers a highly accurate device that has a resistivity which varies linearly with temperature change in a surface-mount package. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to produce these resistors that are ideally designed for temperature detection, providing a small size and rapid response.

  • Ultra-precision thermosensitive surface-mount resistor
  • Stocked in a 500Ω resistance value with tolerances of ±0.5% and ±2.0%
  • Available in any resistance between 5Ω and 500Ω
  • Tolerance options from ±5.0% down to ±0.5% available
  • Linear +6660 ±2% ppm/°C TCR characteristic (from 0 to +100°C)
  • Response time of 0.6 seconds
  • Maximum working voltage of 100V
  • Power rating of 0.125W (at +70°C)
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +125°C

These Alpha NMQ ultra-precision thermosensitive resistors are made of material only a few µm thick and responds rapidly to temperature changes. Strict control of foil composition maintains uniform quality without fluctuation of temperature characteristics of resistance. They are produced by the same fine photo-etching technology used in other metal foil precision resistors from Alpha.

Typical applications for the NMQ ultra-precision thermosensitive resistor series include:
  • Cold junction reference for thermocouples
  • Temperature compensation in load cells
  • Temperature compensation device in semiconductor circuits
  • Temperature sensing devices

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

Alpha NMQ Specifications

* Symbols parenthesized are for part number composition

Specifications
Additional Features
  • Ultra-precision thermosensitive surface-mount resistor
  • Resistance is provided by metal foil meaning the the resistor is highly stable with little change over time
  • Temperature characteristics of resistance are almost linear
  • Response to temperature changes is rapid
  • Small size
  • Response time of 0.6 seconds
Maximum Power Rating
  • 0.125W (at +70°C)
Maximum Resistance
  • 500Ω
Minimum Resistance
TCR
  • +6060 ±2% ppm/°C (0 to +25°C)
  • +6260 ±2% ppm/°C (0 to +50°C)
  • +6660 ±2% ppm/°C (0 to +100°C)
Tolerance
  • ±0.5% (D)
  • ±1.0% (F)
  • ±2.0% (G)
  • ±5.0% (J)

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 CLA, CLB, KLC, NLA, NLB, NMP and NMQ ultra-precision thermosensitive 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.

  • Views: 267
  • Product Code: Alpha NMQ Series
  • SKU: Alpha NMQ Series
  • Availability: In Stock
0 Product(s) Sold
  • £0.00
  • Ex Tax: £0.00

Available Options