The naming convention of SUSUMU precision resistors follows a rigorous coding rule. By combining letters and numbers in the model, the technical parameters, series ownership, and core characteristics of the product can be quickly analyzed. The following is a detailed breakdown of its naming system:
1、 Overview of Naming Structures
Typical model format: series identification+packaging size+resistance value code+precision/temperature coefficient+packaging form
Taking RG1220M-R039-F-T5 as an example:
RG: Series Identification (Ultra Precision Thin Film Resistors)
1220: Package size (length 1.2mm x width 2.0mm, corresponding to 0805 package)
M: Accuracy level (± 1%)
R039: Resistance (0.039 Ω)
F: Packaging form (roll and tape packaging)
T5: Temperature coefficient grade (± 50ppm/℃)
2、 Segmented parsing rules
Series identification (first 2-3 letters)
RG series: Ultra precision thin film resistors, emphasizing low temperature coefficient and high accuracy (such as ± 0.05% accuracy).
RGV series: automotive grade specialized, certified by AEC-Q200, resistant to extreme temperatures and vibrations.
NRG series: non-magnetic material, suitable for medical and strong magnetic field environments.
KRL series: Metal foil resistors, known for their low temperature coefficient (± 5ppm/℃) and high power processing capability.
Package size (4-digit number)
Format: The first two digits are length (inches x 100), and the last two digits are width (inches x 100).
Example:
1220 → 0805 package (1.2mm × 2.0mm).
2512 → 6.4mm × 3.2mm, corresponding to EIA standard 2512 packaging.
Common packaging:
Miniaturization: 0402 (1005), 0603 (1608), 0805 (2012).
Power type: 1206 (3216), 2512 (6432), 3015 (7638).
Resistance value code (1 letter+3 digits)
Alphabet section:
R: Indicate the decimal point (e.g. R039=0.039 Ω).
No letters: directly represents integer resistance value (such as 100=100 Ω).
Number section:
The first three digits: resistance code, using Scientific notation.
Example:
R039 → 0.039 Ω.
R470 → 0.47 Ω.
1000 → 100 Ω (when there is no decimal point, it represents an integer directly).
Accuracy and temperature coefficient (1 letter+1 digit)
Accuracy level:
M: ± 1% (high precision).
K: ± 10% (universal accuracy).
Others: J (± 5%), F (± 1%), etc., need to be confirmed based on specific series.
Temperature coefficient (TCR):
T5: ± 50ppm/℃ (typical value).
T1: ± 25ppm/℃ (automotive grade low-temperature float).
T0: ± 10ppm/℃ (ultra-low temperature float, medical grade specific).
Packaging form (1 letter)
F: Tape&Reel packaging, suitable for automated surface mount production.
B: Bulk, suitable for small batches or R&D testing.
K: Pre formed packaging (such as KRL-KIT kit), containing multiple resistance combinations.
3、 Special model extension rules
Anti sulfurization model: Add - S suffix to the model (such as KRL6432E-M-R010-F-T5-S), and use a special coating to prevent sulfurization corrosion.
Vehicle grade certification: Models that have passed AEC-Q200 are marked in the data manual, and the model itself is not reflected. It needs to be confirmed through parameter screening.
High power models: Package size suffix - HP (such as KRL3015-HP), supporting higher rated power (such as 4W).
4、 Selection logic and typical scenarios
Automotive Electronics: Prioritize the RGV series certified by AEC-Q200, which can withstand extreme temperatures and vibrations.
Medical equipment: The NRG series uses non-magnetic materials and low noise characteristics to ensure high-precision measurements.
Industrial control: KRL series balances power and size, suitable for scenarios such as motor drive.
R&D stage: KRL-KIT kit provides multiple resistance combinations to shorten the prototype development cycle.
5、 Naming Logic Example Analysis
Taking RG1220M-R039-F-T5 as an example:
RG → Ultra precision thin film resistor series.
1220 → 0805 package (1.2mm × 2.0mm).
M → accuracy ± 1%.
R039 → Resistance 0.039 Ω.
F → Tape packaging.
T5 → Temperature coefficient ± 50ppm/℃.
Application scenario: Current sampling in precision instruments requires high precision and low-temperature drift characteristics.
By mastering the above naming logic, users can quickly extract key parameters from the model, achieving efficient selection and inventory management. The naming convention of SUSUMU precision resistors not only reflects the technical characteristics of the product, but also covers the full scenario requirements from laboratory to mass production through series identification.