Alpha MB Series

Alpha MB Series

The MB ultra-precision transfer moulded resistor series from Alpha Electronics offers a wide resistance range from 5Ω up to 400kΩ with tight tolerances, all in a small through-hole package with a pin pitch of 7.5 ±0.5mm. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to produce resistors with low temperature coefficients and excellent long-term stability.

  • Ultra-precision transfer moulded resistor
  • Available in any resistance between 1Ω and 200kΩ
  • Through-hole package with a pin pitch of 7.5±0.5mm
  • Tight tolerance options as low as ±0.005% available for resistances between 30Ω and 400kΩ
  • Tight TCR options available of ±1 ppm/°C (from 0°C up to +65°C, between 30Ω and 400kΩ) or ±2.5 ppm/°C (from -55°C up to +125°C, between 30Ω and 400kΩ)
  • Maximum working voltage of 350V
  • Power rating of 0.5W (at +125°C) or 0.3W (at 200kΩ or above)
  • Maximum rated operating temperature +125°C
  • Working temperature from -65°C up to +175°C

Alpha's Bulk Metal® foil resistor technology means that these transfer moulded, through-hole, ultra-precision resistors are ideal for precision measurements, also their low inductance makes them ideal for use at higher frequencies.

These resistors are constructed using an outer coating of transfer moulded epoxy resin, making the parts strongly resistant to heat, moisture and solvents. Internally, there are secondary leads which act as a buffer so that stress on the exterior leads is not transmitted to the foil, providing stability against vibrations when the resistor in mounted on a circuit.

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

Alpha MB Specifications

* Symbols parenthesized are for part number composition
✝ Resistance figures are the values obtained by measuring the leads at point 12.7±3.2mm away from the base for type MB, MC and MD, but, in case of resistance below 10Ω, the value at 1.6 ±0.6mm away from the base for all types
** Temperature characteristic Z is applicable for temperature range between 0°C and +60°C

Specifications
Additional Features
  • Ultra-precision transfer moulded through-hole resistor
  • Utilises Alpha's Bulk Metal® foil technology for ultra-precision
  • Pin pitch of 7.5 ±0.5mm
  • Maximum working voltage of 350V
  • Working temperature range of -65°C to +175°C
  • Maximum rated operating temperature of +125°C
Maximum Power Rating
  • 0.5W (at +125°C)
  • 0.3W (at 200kΩ or above)
Maximum Resistance
  • 400kΩ
Minimum Resistance
TCR5Ω to 30Ω:
  • ±5 ppm/°C (X)
30Ω to 400kΩ:
  • ±5 ppm/°C (X)
  • ±2.5 ppm/°C (Y)
  • ±1 ppm/°C (Z between 0°C and +60°C)
Tolerance5Ω to 30Ω:
  • ±0.1% (B)
  • ±0.5% (D)
  • ±1.0% (F)
30Ω to 400kΩ:
  • ±0.005% (V)
  • ±0.01% (T)
  • ±0.02% (Q)
  • ±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 MA, MB, MC and MD transfer moulded ultra-precision 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.

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

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