The MQH ultra-precision resistor series from Alpha Electronics offers a wide resistance range from 30Ω up to 60kΩ with tight tolerances down to +0.05% (100Ω to 60kΩ), all in a small surface-mount package. By utilising Alpha’s Bulk Metal® foil resistor technology, they are able to produce resistors with low temperature coefficients and excellent long-term stability. Expanding on the standard Alpha MQ series, the MQH series offers gold-plated J-lead terminals making them suitable for higher temperatures of up to +200°C. The gold-plated J-lead terminals provide flexibility compared to standard fixed surface-mount resistors as the resistive element internally is mechanically isolated from the leads via gold wire-bonding.
Surface-mount ultra-precision resistor
Available in any resistance between 30Ω and 60kΩ
Surface-mount moulded package with gold-plated J-lead terminations for high temperatures of up to +200°C
The resistive element is mechanically isolated from the contact terminals
Tight tolerance of ±0.05% for resistances between 100Ω and 60kΩ
Tight TCR of ±5 ppm/°C (from -55°C up to +125°C, between 100Ω and 60kΩ) or ±10 ppm/°C (from -55°C up to +125°C, between 30Ω and 100Ω)
Maximum working voltage of 100V
Maximum working current of 0.35A
Power rating of 0.125W (at +125°C)
Maximum rated operating temperature +125°C
Temperature range from -65°C up to +200°C
Alpha’s MQH surface-mount, ultra-precision resistor series exhibit excellent high frequency characteristics thanks to their Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.
These resistors are constructed using an outer coating of epoxy resin, which provides excellent resistance to moisture, heat and solvents. Internally, the resistive element is mechanically isolated from the lead frames using gold wire-bonding.
The below table gives the full specifications for each resistor model available including the Alpha MQH series:
We are pleased to provide you with a range of videos, please see below for the latest content available:
VIDEOS
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.
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.
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, 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.
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.
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 MQH Series Resources
Product Datasheet
Alpha MPH & MQH Series Datasheet
Alpha Electronics MPH and MQH high-temperature gold-plated J-lead surface-mount ultra-precision resistor series datasheet
Supporting Product Information
Alpha Manufacturing and Product Information
Alpha Electronics manufacturing process, adjustment of resistance value construction, and temperature characteristics of resistance information
Please be advised that due to the ongoing supply issues with raw materials affecting the global electronics industry, as well as an increase in orders received by our manufacturing partners, a large number of products are facing increased lead times in recent months. For the latest lead time and stock availability, please contact one of our engineers who will be happy to discuss lead times further and the potential for alternative parts.
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