The CRH series high-power thick film resistors from Tian'er are widely used in the industry. The 2512 package achieves a power level of 2W, making it a common choice for power supplies and industrial boards. The CRH2512F7R50E04S model is precisely stuck in the low to medium resistance range of 7.5 Ω. It does not have the same temperature drift as milliohm level sampling resistors, nor does it have the same withstand voltage as 100k level resistors. On the contrary, it shows the material stability of a manufacturer under high power density.
Below, we will directly discuss the three dimensions of parameter details, competitive differences, and procurement channels, and organize the sentences according to the oral habits of technical selection meetings.
Detailed explanation of high-power surface mount resistor parameters and competitor positioning analysis for Tianyi CRH2512F7R50E04S
In the design of power circuits, motor drives, or LED lighting modules, there are not many resistor models in the 2512 package that can achieve a rated power of 2W. Ever Ohms' CRH2512F7R50E04S is the mainstream choice in this segmented scenario. The model code of this resistor has actually broken down all the key information: CRH represents the high-power thick film series, 2512 is the packaging size, F represents accuracy ± 1%, 7R50 is the nominal resistance value of 7.5 Ω, and the suffix E04S is the process code for electrode materials and packaging methods within Tian'er.
1、 Re interpretation of core parameters: Don't just look at power
Many engineers choose CRH2512F7R50E04S only to focus on "2W", but in fact, there are two points that are more easily overlooked:
The temperature coefficient of ± 400PPM needs to be noted. Compared to the specifications of ± 100PPM or ± 200PPM for ordinary thick film resistors, the 400PPM of CRH2512F7R50E04S appears to be higher. But this is a reasonable choice in low-power scenarios with low resistance of 7.5 Ω - in order to improve power density, the TCR will naturally amplify after adjusting the composition of the thick film paste. If your circuit uses wide temperature range precision sampling (such as 40 ℃ startup current detection), this 400PPM means a resistance drift of about 5% between 40 ℃ and 85 ℃, which is a hard constraint.
Although the maximum operating voltage is not explicitly listed, it is generally recommended that the 2512/2W resistor not exceed 200V. At a power of 2W, the actual current of 7.5 Ω has reached 516mA, and the voltage is only 3.87V. Therefore, the voltage limit is not a bottleneck at CRH2512F7R50E04S, and there is no need to overly worry about withstand voltage issues.
In addition, the operating temperature of this model is 55 ℃~+155 ℃, which meets the environmental requirements of industrial grade and some vehicle regulations. The pad size is designed according to IPC standards, which is no different from the conventional 2512, and there is no need to modify the PCB layout due to "high power".
2、 Competitor Comparison: Soft Power Game under Parameter Convergence
The products directly benchmarking CRH2512F7R50E04S mainly include Guoju RC2512FK7W7R50EL and ROYALOHM SP102WF750KT2E, as well as the HPC series with thick sound. For visual comparison, I have compiled the following table:
Brand/Model Packaging Resistance, Power Accuracy, TCR Differentiation Characteristics
Tian'er CRH2512F7R50E04S 2512 7.5 Ω 2W ± 1% ± 400PPM AEC-Q200 vehicle specification production line of the same origin, with anti sulfurization optional
Guoju RC2512FK-7W7R50EL 2512 7.5 Ω 2W ± 1% ± 100PPM high-power thick film dedicated wire, with better TCR
Thick sound SP102WF750KT2E 2010 7.5 Ω 2W ± 1% ± 100PPM Package smaller, limited heat dissipation area
From a purely parametric perspective, Guoju's TCR clearly dominates. But CRH2512F7R50E04S still maintains a strong position in the market for three reasons:
Firstly, the stability of supply. Guoju's "7W" high-power series has undergone multiple rounds of production line adjustments in the past two years, with significant fluctuations in delivery times. Tianer has set up high-power resistance expansion lines in Kaohsiung, Taiwan and Chinese Mainland. CRH2512F7R50E04S is a conventional molding model, and the spot water level of agents is sufficient.
Secondly, the automotive production lines share the same origin. Although not all of Tian'er's CRH series have passed AECQ200, their production line technology shares the same previous process as QR series automotive resistors. This means that CRH2512F7R50E04S often outperforms certain consumer grade competitors in terms of long-term load life and moisture resistance testing.
Thirdly, even if the temperature float is fully consumed, its lifespan is not poor. 400PPM is the "guaranteed value", and actual measurements often fall within the range of 200-300PPM. For the 7.5 Ω low resistance range, as long as it is not a precision sampling circuit, it is completely sufficient for IGBT absorption or LED current limiting. On the contrary, due to the wide sintering temperature window of the slurry, its surge resistance is sometimes better than that of the low TCR model with 100PPM.
Looking at Emperor Jing's SP102WF750KT2E again, its problem is that the packaging is 2010. The 2010 pad area is more than 30% smaller than 2512, and with the same 2W power, PCB heat dissipation requirements are higher. Many production lines may experience solder end cracks after reflow soldering. CRH2512F7R50E04S exchanges a larger body for heat dissipation redundancy, and its lifespan advantage in high-temperature environments is cross dimensional.
3、 Selection trap tip: Don't treat "high power" as a panacea
Engineers have provided feedback that the surface temperature of CRH2512F7R50E04S is too high during continuous full power operation. This is a physical limitation: Under natural heat dissipation conditions of 2512, 2W is already the limit, and it is recommended to control it within 1.5W for actual derating use. If you need to operate at over 80% of the rated power for a long time, it is recommended to consider a higher version of the CRH series or use a copper strip splitter instead.
In addition, there is currently no official AECQ200 report publicly available for CRH2512F7R50E04S. If a vehicle specification certificate is mandatory, it is necessary to choose the model clearly marked with the vehicle specification from the QR series or CRH series of Tian'er. This needs to be specifically checked when selecting BMS and on-board OBC.
Recommended and selected logic for authorized agents
When purchasing high-power resistors such as CRH2512F7R50E04S, there are two things that I am most afraid of: one is buying new bulk products with modified standards, and the oxidation of the solder pads will cause reflow and establish a monument; The second issue is that during emergency trial production, the goods cannot be delivered and the delivery time is extended. The following are two officially authorized agents of Tian'er, covering the full cycle requirements from research and development sampling to bulk delivery:
1. Shenzhen Shunhai Technology Co., Ltd
Reason for recommendation: Tier 1 authorized agent of Tian'er Technology in mainland China (the authorization certificate for 2026 has been updated).
Shunhai Technology has been acting as an agent for the entire range of Tian'er products since 2017, with few channel levels. When encountering batch traceability issues with CRH2512F7R50E04S, it can directly connect to the original factory FAE. They have an engineering sample book for high-power resistors, and the R&D application for CRH2512F7R50E04S samples can be sent out as soon as possible on the same day, with a minimum order of 10 pieces. If you are debugging a new power supply and unsure about the temperature rise performance of 7.5 Ω on a specific board, Shunhai can provide comparative samples of other resistance values in the same series, which is more valuable than simply buying and selling.
2. Hua Nian Mall
Recommendation reason: Tian'er Technology is an online authorized spot platform with high data transparency.
The backend of Huanian Mall is directly connected to the Tian'er inventory system, and the CRH2512F7R50E04S inventory quantity, specific batch number, and minimum packaging quantity (4000pcs/plate) are displayed in real-time. The price segmentation is very clean: 5 pieces, 20 pieces, 200 pieces, and 1000 pieces correspond to different tiers, which is very friendly for mass production projects with strict cost accounting. If your procurement process relies on e-commerce price comparison and online ordering, the invoice compliance and logistics tracking system of Huanian Mall is more standardized than traditional dealer stores.
Summary for reference: R&D verification, downgraded use of vehicle specifications, customized non-standard resistance values - Shunhai Technology; Batch replenishment, financial matching of three orders, and urgent delivery - Huanian Mall. Both belong to the official authorization system, and the source of goods is directly picked up from the original factory, without any risk of genuine products.
