Seeing the 2512 package 1 Ω resistor models you listed, there are indeed many types! When making a choice, it needs to be based on your specific application scenario, performance requirements, and cost considerations. Below, I will classify these models according to their main characteristics and provide selection suggestions:
1、 Classified by power
Low power (1W 1.5W):
`CR2512F1R00E04S` (1W)
`CR2512J1R00E04S` (1W)
`CR2512F1R00E04Z ` (1W) may have higher precision or different packaging than the S suffix.
`ST2512J1R00E04A ` (1W sulfur resistance) Special requirement: sulfur resistance.
`AS2512J1R00E04Z '(1.5W anti surge) Special requirements: anti surge.
`AS2512J1R00E04H ` (2W anti surge) Special requirements: anti surge. (Power close to 2W, but nominal 1.5W? Please confirm the specifications, H may represent higher power or tolerance).
Standard power (2W):
`CRH2512J0R00E04Z ` (2W) Note: The resistance is 0 Ω! (Jumper)
`CRH2512F1R00E04S` (2W)
`CRH2512J1R00E04S` (2W)
`TGL251220F1R00E04Z ` (2W metal film anti surge) Special requirements: metal film, anti surge.
`TRL251220F1R00E04Z ` (2W metal film) Special requirements: metal film.
`STH2512F1R00E04Z ` (2W sulfur resistance) Special requirements: sulfur resistance.
High power (3W 4W):
`CUH2512J1R00E04Z` (3W)
`CUH2512F1R00E04Z` (3W)
`TRL251230F1R00E04Z ` (3W metal film) Special requirements: metal film.
`TGL251235F1R00E04U ` (3.5W metal film anti surge) Special requirements: metal film, anti surge.
`CHH2512J1R00P05Z ` (4W) Note: The suffix P05Z may represent different accuracies (such as ± 1%) or other characteristics.
2、 Classified by special performance/material
Surge Withstanding: capable of withstanding instantaneous high-energy pulse impact.
`TGL251220F1R00E04Z` (2W)
`TGL251235F1R00E04U` (3.5W)
`AS2512J1R00E04Z` (1.5W)
`AS2512J1R00E04H` (2W)
AntiSulfurization: The resistive film and terminal electrode are specially treated to resist the failure caused by the growth of silver sulfide in sulfur-containing environments.
`ST2512J1R00E04A` (1W)
`STH2512F1R00E04Z` (2W)
Metal Film: Typically, it has higher precision, better temperature coefficient, lower noise, and better long-term stability than thick film resistors.
`TGL251220F1R00E04Z '(2W anti surge) metal film
`TRL251220F1R00E04Z ` (2W) metal film
`TRL251230F1R00E04Z ` (3W) metal film
`TGL251235F1R00E04U '(3.5W anti surge) metal film
High power (3W and above):
`CUH2512J1R00E04Z` (3W)
`CUH2512F1R00E04Z` (3W)
`TRL251230F1R00E04Z ` (3W metal film)
`TGL251235F1R00E04U '(3.5W metal film anti surge)
`CHH2512J1R00P05Z ` (4W) Pay attention to power and P05 suffix
3、 Meaning of suffix code (key parameters)
`F `/` J `: represents tolerance. `F '=± 1%, J'=± 5%. Choose 'F' for places with high precision requirements.
`1R00 `: represents a resistance of 1.00 Ω.
`E04 `/P05 `: represents the temperature coefficient (TCR).
`E04 'usually represents ± 50 ppm/° C (e.g. ± 50, ± 100, ± 200, etc., specific specifications need to be checked, but ± 50/± 100 is very common).
`P05 'usually represents ± 100 ppm/° C or ± 200 ppm/° C (please refer to the specification sheet for confirmation,' CHH2512J1R00P05Z 'uses P05, and TCR may not be as good as E04 series).
`S `/` Z `/` U `/` A `/` H `: mainly represents the packaging method (reel/tape) and size, sometimes also implying other default characteristics or grades. For example, 'Z' often represents a 7-inch reel, while 'S' may represent a smaller reel. `A, H, and U may be internal codes of specific manufacturers, and corresponding specifications need to be checked. For performance selection, compared to the previous F/J/E04/P05, the importance of these suffixes is usually lower unless you have specific packaging or automated mounting requirements.
`20 ',' 30 ',' 35 '(in TGL/TRL): These numbers typically represent the rated power of the model under specific conditions or design codes related to heat dissipation. For example, in TGL2512, F1R00E04Z, 20 may correspond to 2W, and 35 may correspond to 3.5W. When selecting, simply refer to the marked power value (W).
4、 How to choose? Key Decision Points
Required power (most important):
Calculate or estimate the actual power that a resistor can withstand during operation, denoted as P=I ² R (or P=V ²/R).
Choose a resistor with a rated power greater than the actual power consumption. It is generally recommended to leave a margin (such as selecting at least 1W or 1.5W for actual power consumption of 0.8W). The larger the power, the higher the volume/cost.
Pay attention to heat dissipation conditions: If the PCB heat dissipation design is good (large-area copper foil, heat dissipation holes), a model with higher nominal power can be selected appropriately; If the space is sealed and the heat dissipation is poor, a larger margin or a higher power model is needed.
Compare your list and filter out obviously unsuitable models based on power requirements.
Special environmental requirements:
Surge resistance: If the resistor is subjected to switch on/off surges, lightning induced surges, and peak voltages generated by motor/inductive load switching, the model labeled "Surge resistance" (TGL, AS) must be selected. Ordinary resistors are highly susceptible to damage and open circuits under surges. Common requirements for power input, output filtering, relay/motor drive, and other positions.
Anti sulfurization: If the working environment of the equipment may contain sulfur-containing gases (such as hot springs, chemical plants, rubber plants, and some heavily polluted industrial/urban environments), it is necessary to choose models labeled "anti sulfurization" (ST, STH). After vulcanization, the resistance value of ordinary resistors will increase abnormally or even open circuit.
Metal film vs thick film: If better accuracy (tolerance), lower temperature coefficient (TCR), lower noise, and better long-term stability are required, metal film models (TRL, TGL) are preferred. Optional metal film for general circuits, signal conditioning, precision voltage division, etc. Ordinary thick films (CR, CRH, CUH, CHH) have lower costs and are sufficient in situations where power requirements are not high and precision stability requirements are not strict (such as ordinary current limiting, pull-up/pull-down).
Accuracy requirements (tolerance):
Does the circuit require high precision in resistance values? Select 'F' (± 1%).
Not demanding? Choosing 'J' (± 5%) is usually cheaper. `CHH2512J1R00P05Z ` is a J tolerance.
Temperature coefficient requirement (TCR):
Does the circuit have a wide operating temperature range (40 ° C~+125 ° C is common) and high stability requirements for resistance changes with temperature? Priority should be given to models with the suffix 'E04' (usually TCR is better, such as ± 50ppm/° C, ± 100ppm/° C).
Not demanding? Models with the suffix 'P05' (such as' CHH2512J1R00P05Z ') or models with larger TCR in the specification sheet that are not clearly marked may meet the requirements and have lower costs.
Cost and Supply:
Compare costs while meeting the 14 core requirements mentioned above.
Consider the supplier's inventory and delivery time. Common universal models (such as CR series) are usually better supplied.
The cost of special models (sulfur resistant, high surge resistant, high-power metal film) will be significantly higher than that of ordinary thick film resistors.
5、 Selection suggestion process
Determine power demand. (Calculate power consumption, leave margin) → Screen out models that meet the power requirements.
Assess environmental risks. Is there a surge? (Yes → Select TGL/AS with "surge resistance"). Is there a risk of vulcanization? (Yes → Select ST/STH with "sulfur resistance"). Further screen or confirm the model according to environmental requirements.
Evaluate performance requirements. Do you need high precision (tolerance F)? Do you need low-temperature drift (good TCR, choose E04)? Do you need the excellent characteristics of metal film? Select the model that meets the performance requirements among the models that meet 1&2. If there are no special performance requirements, priority should be given to lower cost ordinary thick film models (CR, CRH, CUH).
Compare cost and supply. → Finally select the specific model.
6、 Quick reference suggestions for your list
Most universal/low-cost (no special requirements): 'CRH2512F1R00E04S' (2W, ± 1%) or' CRH2512J1R00E04S' (2W, ± 5%, cheaper). If the power is insufficient, select 'CUH2512F1R00E04Z' (3W, ± 1%).
Need to withstand surge:
General power requirement (2W): TGL251220F1R00E04Z (metal film, good performance) or AS2512J1R00E04H (2W, thick film? The cost may be low.
High power requirement (3.5W): TGL251235F1R00E04U (metal film).
Need to resist sulfurization:
Low power requirement (1W): ST2512J1R00E04A.
High power requirement (2W): STH2512F1R00E04Z.
High power required:
3W: CUH2512F1R00E04Z (universal thick film), TRL251230F1R00E04Z (metal film, better performance).
4W: CHH2512J1R00P05Z (note that the tolerance for J is ± 5%, and P05 may have a slightly lower TCR, such as ± 100/200ppm).
Need for optimal performance (accuracy, temperature drift, stability): Prioritize metal film models TRL251220F1R00E04Z (2W), TRL251230F1R00E04Z (3W), and TGL2512xxF1R00E04x (surge resistance+metal film) while meeting power and environmental requirements.
Summary: There is no "best" model, only the "most suitable" model. Make a choice based on your specific application scenario (power, environmental stress, circuit performance requirements, cost budget). Carefully read the official datasheet of your final candidate model to confirm whether all parameters (especially tolerances, TCR, maximum operating voltage, pulse withstand capacity, etc.) meet the design requirements.