Suggestions for parameter selection of Ellon brand 2512 1R (1 Ω) surface mount resistor

Regarding the selection of 1 Ω surface mount resistors for the Ellon 2512 package, the following are key parameter comparisons and selection recommendations:

1、 Comparison Table of Model Core Parameters
|Model | Power | Material | Accuracy | Characteristics|
|EHP25JS0R00VDJ | 2W | Thick Film | 5% | Basic Type|
|EGM25FS1R00DDS | 2W | Metal film | 1% | Surge resistant|
|EHP25FS1R00FDS | 2W | Thick Film | 1% | Conventional Precision|
|ELR25FR1R00DDS | 3W | Metal film | 1% | High power|
|ELR25FS1R00DDS | 2W | Metal Film | 1% | Conventional Type|
|EAM25FS1R00DDS | 2W | Metal Film | 1% | Sulfur Resistance|
|EHP25FR1R00HDU | 3W | Thick film high power | 1% | Ultra high power|
|EHP25JR1R00HDU | 3W | Thick film high power | 5% | High power and low cost|
|EHP25JS1R00FDS | 2W | Thick film high power | 5% | Medium power|
|EGM25FU1R00DDS | 3.5W | Metal Film | 1% | Surge Resistance+Ultra High Power|

2、 Selection decision tree (by priority)
1. Power demand:
≥ 3W: Choose ELR25FR1R00DDS (3W metal film)/EHP25FR1R00HDU (3W thick film high-power)/EGM25FU1R00DDS (3.5W surge resistant preferred)
≤ 2W: Filter based on other characteristics

2. Special environment:
Surge resistance (lightning/power surge): EGM25FS1R00DDS (2W) or EGM25FU1R00DDS (3.5W)
Sulfur resistant (sulfur-containing environment/industrial area): EAM25FS1R00DDS`
High temperature/high reliability: Priority metal film series (ELR/EGM/EAM)

3. Accuracy requirements:
1%: Exclude EHP25JS0R00VDJ/EHP25JR1R00HDU/EHP25JS1R00FDS`
5%: Choose thick film models (reducing costs by 30% and 50%)

4. Cost optimization:
When there are no special requirements: choose EHP25JS1R00FDS (2W thick film 5%) or EHP25JR1R00HDU (3W thick film 5%)
Precision requirement: ELR25FS1R00DDS (2W metal film 1%) offers the best cost-effectiveness



3、 Recommended solutions for typical scenarios
|Application scenarios | Recommended models | Core advantages|
|Switching power supply output stage | ELR25FR1R00DDS | 3W metal film, resistant to high current|
|Industrial Control System | EAM25FS1R00DDS | Sulfur resistant, adaptable to harsh environments|
|LED driver/power module | EGM25FU1R00DDS | 3.5W anti surge, anti instantaneous burnout|
|Consumer Electronics (Low Cost) | EHP25JS1R00FDS | 2W Thick Film 5%, Optimal Cost|
|Automotive Electronics (High Reliability) | ELR25FS1R00DDS | Metal Film 1%, Good Temperature Stability|



4、 Key precautions
1. Power derating:
When the ambient temperature is above 70 ℃, all models need to be downgraded for use (such as the 3W model with only 1.5W remaining at 100 ℃)
The derating curve of thick film resistors (EHP series) is steeper than that of metal films (ELR/EGM)

2. Welding process:
Metal film resistors (ELR/EGM/EAM) have better resistance to welding heat (>260 ℃)
Thick film high-power model (EHPxxHDU) recommends reflow soldering peak temperature ≤ 245 ℃

3. Failure prevention:
Sulfur resistant model (EAM) increases lifespan by 58 times in sulfur-containing environments
The anti surge model (EGM) can withstand a pulse impulse of 10 times the rated voltage (1 μ s)

>Tip: When selecting, it is necessary to consider PCB heat dissipation design - metal film resistors have a thermal conductivity efficiency about 40% higher than thick films, and have obvious advantages in compact layouts.

It is recommended to prioritize confirming power requirements and environmental stress, and then screen in the corresponding categories based on the budget. If pursuing ultimate reliability, the metal film anti surge model (EGM series) is the optimal solution for comprehensive performance.