Regarding the selection of 1 Ω (1R) surface mount resistors for the Ellon 2512 package (6.4 × 3.2mm), the following is a summary of the models and selection suggestions you have provided to help you choose the most suitable model according to your specific needs:
be careful:
>The '0R00' in 'EHP25JS0R00VDJ' indicates a resistance value of 0 Ω (jumper resistance), not 1 Ω. Please confirm if there is an error in the labeling.
>ELR25FS1R00DDS is listed repeatedly, but it is actually the same model.
Key factors and suggestions for selection
1. Power demand:
Conventional applications (≤ 2W): prioritize EHP25FS1R00FDS (thick film 1%) or ELR25FS1R00DDS (metal film 1%).
High power (≥ 3W):
Metal film: ELR25FR1R00DDS (3W) or EGM25FU1R00DDS (3.5W, surge resistant).
Thick film: EHP25FR1R00HDU (3W, 1%) or EHP25JR1R00HDU (3W, 5%, low-cost).
2. Special environment:
Sulfur resistant (industrial/automotive): Must select 'EAM25FS1R00DDS'.
Surge resistance (power input/lightning protection): Select 'EGM25FS1R00DDS' (2W) or' EGM25FU1R00DDS' (3.5W).
3. Accuracy requirements:
Precision circuits (such as ADC reference): Choose the 1% series (such as ELR/EGM/EHP25F).
Non critical circuits (current limiting/voltage divider): Optional 5% series (such as EHP25J) to reduce costs.
4. Cost optimization:
Low cost solution: EHP25JS1R00FDS (2W thick film 5%) or EHP25JR1R00HDU (3W thick film 5%).
Cost performance balance: ELR25FS1R00DDS (metal film 1%, 2W).
final recommendation
General scenario: ELR25FS1R00DDS (metal film 1%, 2W, balanced performance).
Power protection: EGM25FU1R00DDS (3.5W surge resistant, suitable for harsh environments).
High sulfur environment: EAM25FS1R00DDS (sulfur resistant, industrial reliability).
Cost sensitive: EHP25JS1R00FDS (2W thick film 5%) or EHP25JR1R00HDU (3W thick film 5%).
> Verification steps:
> 1. Confirm actual power consumption (with a 50% margin reserved).
> 2. Check for the presence of sulfides/frequent surges in the environment.
> 3. Evaluate the heat dissipation capability of PCB (heat dissipation design needs to be strengthened for 3W or more).