The FLA high precision through-hole resistor series from Alpha Electronics offers a very precise resistor with a resistance range from 5Ω up to 100kΩ all in a small through-hole package. The terminals have been designed for easy insertion into the PCB. By utilising Alpha’s Bulk Metal® foil resistor technology, they are able to produce resistors with low-temperature coefficients and excellent long-term stability. This makes them ideal for precision measurements, also their low inductance enables use at higher frequencies.
Conformally coated through-hole resistor
Resistance values between 5Ω and 100kΩ
Tolerance options as low as ±0.05%
TCR of ±2.5 ppm/°C or ±5 ppm/°C
Temperature range from -25°C to +155°C
Maximum working voltage of 250V
Power rating of 0.125W (at +70°C)
Pin pitch of 2.54mm ±0.25mm
Typical applications for the FLA high precision through-hole resistor series include:
Sceintific instrumentation
Test & Measurement equipment
Alpha Electronics FLA Series Specification Table
Attributes
Value
Resistance value
5Ω to 100kΩ
Tolerance
±0.05% to ±1%
TCR
±2.5ppm/°C or ±5ppm/°C (-25 to +125°C)
Temperature range
-25°C to +155°C
Power rating (at +70°C)
0.125W
Maximum voltage
250V
Alpha Electronics are manufacturers of some of the most stable and precise resistors on the market. As part of the VPG Foil Resistors product group, the Alpha Electronics brand is globally rewarded for the accuracy and reliability of their Bulk Metal® Foil technology resistors. Alpha Electronics has been living the conviction globally known to engineers for consistently delivering the highly desirable characteristics of “Stability, Accuracy and Reliability”. Please visit https://www.alpha-elec.co.jp for more information.
Alpha Manufacturing and Product Information
Alpha Electronics manufacturing process, adjustment of resistance value construction, and temperature characteristics of resistance information
The FLA resistor series is available with various options including standard resistance values and tolerances. The information below gives an example of the part numbering system used for these resistors and the standard options available.
Below is an example of the part number break down for the FLA resistor series:
Alpha Electronics FLA Series – Standard Stocked Parts
Resistance Value
Part Number Value
0.5% Tolerance
5 ppm/°C
30Ω
30R000
50Ω
50R000
100Ω
100R00
150Ω
150R00
200Ω
200R00
250Ω
250R00
270Ω
270R00
300Ω
300R00
500Ω
500R00
900Ω
900R00
1kΩ
1K0000
2kΩ
2K0000
3kΩ
3K0000
4kΩ
4K0000
5kΩ
5K0000
8kΩ
8K0000
10kΩ
10K0000
20kΩ
20K000
Alpha Resistor Videos
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.
